#!/bin/sh
# Tcl ignores the next line -*- tcl -*- \
 if test "z$*" = zversion \
 || test "z$*" = z--version; \
 then \
        echo 'git-gui version @@GITGUI_VERSION@@'; \
        exit; \
 fi; \
 argv0=$0; \
 exec wish "$argv0" -- "$@"

set appvers {@@GITGUI_VERSION@@}
set copyright [encoding convertfrom utf-8 {
Copyright © 2006, 2007 Shawn Pearce, et. al.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA}]

######################################################################
##
## Tcl/Tk sanity check

if {[catch {package require Tcl 8.4} err]
 || [catch {package require Tk  8.4} err]
} {
        catch {wm withdraw .}
        tk_messageBox \
                -icon error \
                -type ok \
                -title [mc "git-gui: fatal error"] \
                -message $err
        exit 1
}

catch {rename send {}} ; # What an evil concept...

######################################################################
##
## locate our library

set oguilib {@@GITGUI_LIBDIR@@}
set oguirel {@@GITGUI_RELATIVE@@}
if {$oguirel eq {1}} {
        set oguilib [file dirname [file normalize $argv0]]
        if {[file tail $oguilib] eq {git-core}} {
                set oguilib [file dirname $oguilib]
        }
        set oguilib [file dirname $oguilib]
        set oguilib [file join $oguilib share git-gui lib]
        set oguimsg [file join $oguilib msgs]
} elseif {[string match @@* $oguirel]} {
        set oguilib [file join [file dirname [file normalize $argv0]] lib]
        set oguimsg [file join [file dirname [file normalize $argv0]] po]
} else {
        set oguimsg [file join $oguilib msgs]
}
unset oguirel

######################################################################
##
## enable verbose loading?

if {![catch {set _verbose $env(GITGUI_VERBOSE)}]} {
        unset _verbose
        rename auto_load real__auto_load
        proc auto_load {name args} {
                puts stderr "auto_load $name"
                return [uplevel 1 real__auto_load $name $args]
        }
        rename source real__source
        proc source {name} {
                puts stderr "source    $name"
                uplevel 1 real__source $name
        }
}

######################################################################
##
## Internationalization (i18n) through msgcat and gettext. See
## http://www.gnu.org/software/gettext/manual/html_node/Tcl.html

package require msgcat

proc _mc_trim {fmt} {
        set cmk [string first @@ $fmt]
        if {$cmk > 0} {
                return [string range $fmt 0 [expr {$cmk - 1}]]
        }
        return $fmt
}

proc mc {en_fmt args} {
        set fmt [_mc_trim [::msgcat::mc $en_fmt]]
        if {[catch {set msg [eval [list format $fmt] $args]} err]} {
                set msg [eval [list format [_mc_trim $en_fmt]] $args]
        }
        return $msg
}

proc strcat {args} {
        return [join $args {}]
}

::msgcat::mcload $oguimsg
unset oguimsg

######################################################################
##
## read only globals

set _appname {Git Gui}
set _gitdir {}
set _gitexec {}
set _reponame {}
set _iscygwin {}
set _search_path {}

set _trace [lsearch -exact $argv --trace]
if {$_trace >= 0} {
        set argv [lreplace $argv $_trace $_trace]
        set _trace 1
} else {
        set _trace 0
}

proc appname {} {
        global _appname
        return $_appname
}

proc gitdir {args} {
        global _gitdir
        if {$args eq {}} {
                return $_gitdir
        }
        return [eval [list file join $_gitdir] $args]
}

proc gitexec {args} {
        global _gitexec
        if {$_gitexec eq {}} {
                if {[catch {set _gitexec [git --exec-path]} err]} {
                        error "Git not installed?\n\n$err"
                }
                if {[is_Cygwin]} {
                        set _gitexec [exec cygpath \
                                --windows \
                                --absolute \
                                $_gitexec]
                } else {
                        set _gitexec [file normalize $_gitexec]
                }
        }
        if {$args eq {}} {
                return $_gitexec
        }
        return [eval [list file join $_gitexec] $args]
}

proc reponame {} {
        return $::_reponame
}

proc is_MacOSX {} {
        if {[tk windowingsystem] eq {aqua}} {
                return 1
        }
        return 0
}

proc is_Windows {} {
        if {$::tcl_platform(platform) eq {windows}} {
                return 1
        }
        return 0
}

proc is_Cygwin {} {
        global _iscygwin
        if {$_iscygwin eq {}} {
                if {$::tcl_platform(platform) eq {windows}} {
                        if {[catch {set p [exec cygpath --windir]} err]} {
                                set _iscygwin 0
                        } else {
                                set _iscygwin 1
                        }
                } else {
                        set _iscygwin 0
                }
        }
        return $_iscygwin
}

proc is_enabled {option} {
        global enabled_options
        if {[catch {set on $enabled_options($option)}]} {return 0}
        return $on
}

proc enable_option {option} {
        global enabled_options
        set enabled_options($option) 1
}

proc disable_option {option} {
        global enabled_options
        set enabled_options($option) 0
}

######################################################################
##
## config

proc is_many_config {name} {
        switch -glob -- $name {
        gui.recentrepo -
        remote.*.fetch -
        remote.*.push
                {return 1}
        *
                {return 0}
        }
}

proc is_config_true {name} {
        global repo_config
        if {[catch {set v $repo_config($name)}]} {
                return 0
        } elseif {$v eq {true} || $v eq {1} || $v eq {yes}} {
                return 1
        } else {
                return 0
        }
}

proc get_config {name} {
        global repo_config
        if {[catch {set v $repo_config($name)}]} {
                return {}
        } else {
                return $v
        }
}

######################################################################
##
## handy utils

proc _trace_exec {cmd} {
        if {!$::_trace} return
        set d {}
        foreach v $cmd {
                if {$d ne {}} {
                        append d { }
                }
                if {[regexp {[ \t\r\n'"$?*]} $v]} {
                        set v [sq $v]
                }
                append d $v
        }
        puts stderr $d
}

proc _git_cmd {name} {
        global _git_cmd_path

        if {[catch {set v $_git_cmd_path($name)}]} {
                switch -- $name {
                  version   -
                --version   -
                --exec-path { return [list $::_git $name] }
                }

                set p [gitexec git-$name$::_search_exe]
                if {[file exists $p]} {
                        set v [list $p]
                } elseif {[is_Windows] && [file exists [gitexec git-$name]]} {
                        # Try to determine what sort of magic will make
                        # git-$name go and do its thing, because native
                        # Tcl on Windows doesn't know it.
                        #
                        set p [gitexec git-$name]
                        set f [open $p r]
                        set s [gets $f]
                        close $f

                        switch -glob -- [lindex $s 0] {
                        #!*sh     { set i sh     }
                        #!*perl   { set i perl   }
                        #!*python { set i python }
                        default   { error "git-$name is not supported: $s" }
                        }

                        upvar #0 _$i interp
                        if {![info exists interp]} {
                                set interp [_which $i]
                        }
                        if {$interp eq {}} {
                                error "git-$name requires $i (not in PATH)"
                        }
                        set v [concat [list $interp] [lrange $s 1 end] [list $p]]
                } else {
                        # Assume it is builtin to git somehow and we
                        # aren't actually able to see a file for it.
                        #
                        set v [list $::_git $name]
                }
                set _git_cmd_path($name) $v
        }
        return $v
}

proc _which {what args} {
        global env _search_exe _search_path

        if {$_search_path eq {}} {
                if {[is_Cygwin] && [regexp {^(/|\.:)} $env(PATH)]} {
                        set _search_path [split [exec cygpath \
                                --windows \
                                --path \
                                --absolute \
                                $env(PATH)] {;}]
                        set _search_exe .exe
                } elseif {[is_Windows]} {
                        set gitguidir [file dirname [info script]]
                        regsub -all ";" $gitguidir "\\;" gitguidir
                        set env(PATH) "$gitguidir;$env(PATH)"
                        set _search_path [split $env(PATH) {;}]
                        set _search_exe .exe
                } else {
                        set _search_path [split $env(PATH) :]
                        set _search_exe {}
                }
        }

        if {[is_Windows] && [lsearch -exact $args -script] >= 0} {
                set suffix {}
        } else {
                set suffix $_search_exe
        }

        foreach p $_search_path {
                set p [file join $p $what$suffix]
                if {[file exists $p]} {
                        return [file normalize $p]
                }
        }
        return {}
}

proc _lappend_nice {cmd_var} {
        global _nice
        upvar $cmd_var cmd

        if {![info exists _nice]} {
                set _nice [_which nice]
        }
        if {$_nice ne {}} {
                lappend cmd $_nice
        }
}

proc git {args} {
        set opt [list]

        while {1} {
                switch -- [lindex $args 0] {
                --nice {
                        _lappend_nice opt
                }

                default {
                        break
                }

                }

                set args [lrange $args 1 end]
        }

        set cmdp [_git_cmd [lindex $args 0]]
        set args [lrange $args 1 end]

        _trace_exec [concat $opt $cmdp $args]
        set result [eval exec $opt $cmdp $args]
        if {$::_trace} {
                puts stderr "< $result"
        }
        return $result
}

proc _open_stdout_stderr {cmd} {
        _trace_exec $cmd
        if {[catch {
                        set fd [open [concat [list | ] $cmd] r]
                } err]} {
                if {   [lindex $cmd end] eq {2>@1}
                    && $err eq {can not find channel named "1"}
                        } {
                        # Older versions of Tcl 8.4 don't have this 2>@1 IO
                        # redirect operator.  Fallback to |& cat for those.
                        # The command was not actually started, so its safe
                        # to try to start it a second time.
                        #
                        set fd [open [concat \
                                [list | ] \
                                [lrange $cmd 0 end-1] \
                                [list |& cat] \
                                ] r]
                } else {
                        error $err
                }
        }
        fconfigure $fd -eofchar {}
        return $fd
}

proc git_read {args} {
        set opt [list]

        while {1} {
                switch -- [lindex $args 0] {
                --nice {
                        _lappend_nice opt
                }

                --stderr {
                        lappend args 2>@1
                }

                default {
                        break
                }

                }

                set args [lrange $args 1 end]
        }

        set cmdp [_git_cmd [lindex $args 0]]
        set args [lrange $args 1 end]

        return [_open_stdout_stderr [concat $opt $cmdp $args]]
}

proc git_write {args} {
        set opt [list]

        while {1} {
                switch -- [lindex $args 0] {
                --nice {
                        _lappend_nice opt
                }

                default {
                        break
                }

                }

                set args [lrange $args 1 end]
        }

        set cmdp [_git_cmd [lindex $args 0]]
        set args [lrange $args 1 end]

        _trace_exec [concat $opt $cmdp $args]
        return [open [concat [list | ] $opt $cmdp $args] w]
}

proc githook_read {hook_name args} {
        set pchook [gitdir hooks $hook_name]
        lappend args 2>@1

        # On Windows [file executable] might lie so we need to ask
        # the shell if the hook is executable.  Yes that's annoying.
        #
        if {[is_Windows]} {
                upvar #0 _sh interp
                if {![info exists interp]} {
                        set interp [_which sh]
                }
                if {$interp eq {}} {
                        error "hook execution requires sh (not in PATH)"
                }

                set scr {if test -x "$1";then exec "$@";fi}
                set sh_c [list $interp -c $scr $interp $pchook]
                return [_open_stdout_stderr [concat $sh_c $args]]
        }

        if {[file executable $pchook]} {
                return [_open_stdout_stderr [concat [list $pchook] $args]]
        }

        return {}
}

proc kill_file_process {fd} {
        set process [pid $fd]

        catch {
                if {[is_Windows]} {
                        # Use a Cygwin-specific flag to allow killing
                        # native Windows processes
                        exec kill -f $process
                } else {
                        exec kill $process
                }
        }
}

proc gitattr {path attr default} {
        if {[catch {set r [git check-attr $attr -- $path]}]} {
                set r unspecified
        } else {
                set r [join [lrange [split $r :] 2 end] :]
                regsub {^ } $r {} r
        }
        if {$r eq {unspecified}} {
                return $default
        }
        return $r
}

proc sq {value} {
        regsub -all ' $value "'\\''" value
        return "'$value'"
}

proc load_current_branch {} {
        global current_branch is_detached

        set fd [open [gitdir HEAD] r]
        if {[gets $fd ref] < 1} {
                set ref {}
        }
        close $fd

        set pfx {ref: refs/heads/}
        set len [string length $pfx]
        if {[string equal -length $len $pfx $ref]} {
                # We're on a branch.  It might not exist.  But
                # HEAD looks good enough to be a branch.
                #
                set current_branch [string range $ref $len end]
                set is_detached 0
        } else {
                # Assume this is a detached head.
                #
                set current_branch HEAD
                set is_detached 1
        }
}

auto_load tk_optionMenu
rename tk_optionMenu real__tkOptionMenu
proc tk_optionMenu {w varName args} {
        set m [eval real__tkOptionMenu $w $varName $args]
        $m configure -font font_ui
        $w configure -font font_ui
        return $m
}

proc rmsel_tag {text} {
        $text tag conf sel \
                -background [$text cget -background] \
                -foreground [$text cget -foreground] \
                -borderwidth 0
        $text tag conf in_sel -background lightgray
        bind $text <Motion> break
        return $text
}

set root_exists 0
bind . <Visibility> {
        bind . <Visibility> {}
        set root_exists 1
}

if {[is_Windows]} {
        wm iconbitmap . -default $oguilib/git-gui.ico
        set ::tk::AlwaysShowSelection 1
}

######################################################################
##
## config defaults

set cursor_ptr arrow
font create font_diff -family Courier -size 10
font create font_ui
catch {
        label .dummy
        eval font configure font_ui [font actual [.dummy cget -font]]
        destroy .dummy
}

font create font_uiitalic
font create font_uibold
font create font_diffbold
font create font_diffitalic

foreach class {Button Checkbutton Entry Label
                Labelframe Listbox Menu Message
                Radiobutton Spinbox Text} {
        option add *$class.font font_ui
}
unset class

if {[is_Windows] || [is_MacOSX]} {
        option add *Menu.tearOff 0
}

if {[is_MacOSX]} {
        set M1B M1
        set M1T Cmd
} else {
        set M1B Control
        set M1T Ctrl
}

proc bind_button3 {w cmd} {
        bind $w <Any-Button-3> $cmd
        if {[is_MacOSX]} {
                # Mac OS X sends Button-2 on right click through three-button mouse,
                # or through trackpad right-clicking (two-finger touch + click).
                bind $w <Any-Button-2> $cmd
                bind $w <Control-Button-1> $cmd
        }
}

proc apply_config {} {
        global repo_config font_descs

        foreach option $font_descs {
                set name [lindex $option 0]
                set font [lindex $option 1]
                if {[catch {
                        set need_weight 1
                        foreach {cn cv} $repo_config(gui.$name) {
                                if {$cn eq {-weight}} {
                                        set need_weight 0
                                }
                                font configure $font $cn $cv
                        }
                        if {$need_weight} {
                                font configure $font -weight normal
                        }
                        } err]} {
                        error_popup [strcat [mc "Invalid font specified in %s:" "gui.$name"] "\n\n$err"]
                }
                foreach {cn cv} [font configure $font] {
                        font configure ${font}bold $cn $cv
                        font configure ${font}italic $cn $cv
                }
                font configure ${font}bold -weight bold
                font configure ${font}italic -slant italic
        }
}

set default_config(branch.autosetupmerge) true
set default_config(merge.tool) {}
set default_config(merge.keepbackup) true
set default_config(merge.diffstat) true
set default_config(merge.summary) false
set default_config(merge.verbosity) 2
set default_config(user.name) {}
set default_config(user.email) {}

set default_config(gui.encoding) [encoding system]
set default_config(gui.matchtrackingbranch) false
set default_config(gui.pruneduringfetch) false
set default_config(gui.trustmtime) false
set default_config(gui.fastcopyblame) false
set default_config(gui.copyblamethreshold) 40
set default_config(gui.blamehistoryctx) 7
set default_config(gui.diffcontext) 5
set default_config(gui.commitmsgwidth) 75
set default_config(gui.newbranchtemplate) {}
set default_config(gui.spellingdictionary) {}
set default_config(gui.fontui) [font configure font_ui]
set default_config(gui.fontdiff) [font configure font_diff]
set font_descs {
        {fontui   font_ui   {mc "Main Font"}}
        {fontdiff font_diff {mc "Diff/Console Font"}}
}

######################################################################
##
## find git

set _git  [_which git]
if {$_git eq {}} {
        catch {wm withdraw .}
        tk_messageBox \
                -icon error \
                -type ok \
                -title [mc "git-gui: fatal error"] \
                -message [mc "Cannot find git in PATH."]
        exit 1
}

######################################################################
##
## version check

if {[catch {set _git_version [git --version]} err]} {
        catch {wm withdraw .}
        tk_messageBox \
                -icon error \
                -type ok \
                -title [mc "git-gui: fatal error"] \
                -message "Cannot determine Git version:

$err

[appname] requires Git 1.5.0 or later."
        exit 1
}
if {![regsub {^git version } $_git_version {} _git_version]} {
        catch {wm withdraw .}
        tk_messageBox \
                -icon error \
                -type ok \
                -title [mc "git-gui: fatal error"] \
                -message [strcat [mc "Cannot parse Git version string:"] "\n\n$_git_version"]
        exit 1
}

set _real_git_version $_git_version
regsub -- {[\-\.]dirty$} $_git_version {} _git_version
regsub {\.[0-9]+\.g[0-9a-f]+$} $_git_version {} _git_version
regsub {\.rc[0-9]+$} $_git_version {} _git_version
regsub {\.GIT$} $_git_version {} _git_version
regsub {\.[a-zA-Z]+\.[0-9]+$} $_git_version {} _git_version

if {![regexp {^[1-9]+(\.[0-9]+)+$} $_git_version]} {
        catch {wm withdraw .}
        if {[tk_messageBox \
                -icon warning \
                -type yesno \
                -default no \
                -title "[appname]: warning" \
                 -message [mc "Git version cannot be determined.

%s claims it is version '%s'.

%s requires at least Git 1.5.0 or later.

Assume '%s' is version 1.5.0?
" $_git $_real_git_version [appname] $_real_git_version]] eq {yes}} {
                set _git_version 1.5.0
        } else {
                exit 1
        }
}
unset _real_git_version

proc git-version {args} {
        global _git_version

        switch [llength $args] {
        0 {
                return $_git_version
        }

        2 {
                set op [lindex $args 0]
                set vr [lindex $args 1]
                set cm [package vcompare $_git_version $vr]
                return [expr $cm $op 0]
        }

        4 {
                set type [lindex $args 0]
                set name [lindex $args 1]
                set parm [lindex $args 2]
                set body [lindex $args 3]

                if {($type ne {proc} && $type ne {method})} {
                        error "Invalid arguments to git-version"
                }
                if {[llength $body] < 2 || [lindex $body end-1] ne {default}} {
                        error "Last arm of $type $name must be default"
                }

                foreach {op vr cb} [lrange $body 0 end-2] {
                        if {[git-version $op $vr]} {
                                return [uplevel [list $type $name $parm $cb]]
                        }
                }

                return [uplevel [list $type $name $parm [lindex $body end]]]
        }

        default {
                error "git-version >= x"
        }

        }
}

if {[git-version < 1.5]} {
        catch {wm withdraw .}
        tk_messageBox \
                -icon error \
                -type ok \
                -title [mc "git-gui: fatal error"] \
                -message "[appname] requires Git 1.5.0 or later.

You are using [git-version]:

[git --version]"
        exit 1
}

######################################################################
##
## configure our library

set idx [file join $oguilib tclIndex]
if {[catch {set fd [open $idx r]} err]} {
        catch {wm withdraw .}
        tk_messageBox \
                -icon error \
                -type ok \
                -title [mc "git-gui: fatal error"] \
                -message $err
        exit 1
}
if {[gets $fd] eq {# Autogenerated by git-gui Makefile}} {
        set idx [list]
        while {[gets $fd n] >= 0} {
                if {$n ne {} && ![string match #* $n]} {
                        lappend idx $n
                }
        }
} else {
        set idx {}
}
close $fd

if {$idx ne {}} {
        set loaded [list]
        foreach p $idx {
                if {[lsearch -exact $loaded $p] >= 0} continue
                source [file join $oguilib $p]
                lappend loaded $p
        }
        unset loaded p
} else {
        set auto_path [concat [list $oguilib] $auto_path]
}
unset -nocomplain idx fd

######################################################################
##
## config file parsing

git-version proc _parse_config {arr_name args} {
        >= 1.5.3 {
                upvar $arr_name arr
                array unset arr
                set buf {}
                catch {
                        set fd_rc [eval \
                                [list git_read config] \
                                $args \
                                [list --null --list]]
                        fconfigure $fd_rc -translation binary
                        set buf [read $fd_rc]
                        close $fd_rc
                }
                foreach line [split $buf "\0"] {
                        if {[regexp {^([^\n]+)\n(.*)$} $line line name value]} {
                                if {[is_many_config $name]} {
                                        lappend arr($name) $value
                                } else {
                                        set arr($name) $value
                                }
                        }
                }
        }
        default {
                upvar $arr_name arr
                array unset arr
                catch {
                        set fd_rc [eval [list git_read config --list] $args]
                        while {[gets $fd_rc line] >= 0} {
                                if {[regexp {^([^=]+)=(.*)$} $line line name value]} {
                                        if {[is_many_config $name]} {
                                                lappend arr($name) $value
                                        } else {
                                                set arr($name) $value
                                        }
                                }
                        }
                        close $fd_rc
                }
        }
}

proc load_config {include_global} {
        global repo_config global_config default_config

        if {$include_global} {
                _parse_config global_config --global
        }
        _parse_config repo_config

        foreach name [array names default_config] {
                if {[catch {set v $global_config($name)}]} {
                        set global_config($name) $default_config($name)
                }
                if {[catch {set v $repo_config($name)}]} {
                        set repo_config($name) $default_config($name)
                }
        }
}

######################################################################
##
## feature option selection

if {[regexp {^git-(.+)$} [file tail $argv0] _junk subcommand]} {
        unset _junk
} else {
        set subcommand gui
}
if {$subcommand eq {gui.sh}} {
        set subcommand gui
}
if {$subcommand eq {gui} && [llength $argv] > 0} {
        set subcommand [lindex $argv 0]
        set argv [lrange $argv 1 end]
}

enable_option multicommit
enable_option branch
enable_option transport
disable_option bare

switch -- $subcommand {
browser -
blame {
        enable_option bare

        disable_option multicommit
        disable_option branch
        disable_option transport
}
citool {
        enable_option singlecommit
        enable_option retcode

        disable_option multicommit
        disable_option branch
        disable_option transport

        while {[llength $argv] > 0} {
                set a [lindex $argv 0]
                switch -- $a {
                --amend {
                        enable_option initialamend
                }
                --nocommit {
                        enable_option nocommit
                        enable_option nocommitmsg
                }
                --commitmsg {
                        disable_option nocommitmsg
                }
                default {
                        break
                }
                }

                set argv [lrange $argv 1 end]
        }
}
}

######################################################################
##
## repository setup

set picked 0
if {[catch {
                set _gitdir $env(GIT_DIR)
                set _prefix {}
                }]
        && [catch {
                set _gitdir [git rev-parse --git-dir]
                set _prefix [git rev-parse --show-prefix]
        } err]} {
        load_config 1
        apply_config
        choose_repository::pick
        set picked 1
}
if {![file isdirectory $_gitdir] && [is_Cygwin]} {
        catch {set _gitdir [exec cygpath --windows $_gitdir]}
}
if {![file isdirectory $_gitdir]} {
        catch {wm withdraw .}
        error_popup [strcat [mc "Git directory not found:"] "\n\n$_gitdir"]
        exit 1
}
if {$_prefix ne {}} {
        regsub -all {[^/]+/} $_prefix ../ cdup
        if {[catch {cd $cdup} err]} {
                catch {wm withdraw .}
                error_popup [strcat [mc "Cannot move to top of working directory:"] "\n\n$err"]
                exit 1
        }
        unset cdup
} elseif {![is_enabled bare]} {
        if {[lindex [file split $_gitdir] end] ne {.git}} {
                catch {wm withdraw .}
                error_popup [strcat [mc "Cannot use funny .git directory:"] "\n\n$_gitdir"]
                exit 1
        }
        if {[catch {cd [file dirname $_gitdir]} err]} {
                catch {wm withdraw .}
                error_popup [strcat [mc "No working directory"] " [file dirname $_gitdir]:\n\n$err"]
                exit 1
        }
}
set _reponame [file split [file normalize $_gitdir]]
if {[lindex $_reponame end] eq {.git}} {
        set _reponame [lindex $_reponame end-1]
} else {
        set _reponame [lindex $_reponame end]
}

######################################################################
##
## global init

set current_diff_path {}
set current_diff_side {}
set diff_actions [list]

set HEAD {}
set PARENT {}
set MERGE_HEAD [list]
set commit_type {}
set empty_tree {}
set current_branch {}
set is_detached 0
set current_diff_path {}
set is_3way_diff 0
set is_conflict_diff 0
set selected_commit_type new

set nullid "0000000000000000000000000000000000000000"
set nullid2 "0000000000000000000000000000000000000001"

set have_tk85 [expr {[package vcompare $tk_version "8.5"] >= 0}]

######################################################################
##
## task management

set rescan_active 0
set diff_active 0
set last_clicked {}

set disable_on_lock [list]
set index_lock_type none

proc lock_index {type} {
        global index_lock_type disable_on_lock

        if {$index_lock_type eq {none}} {
                set index_lock_type $type
                foreach w $disable_on_lock {
                        uplevel #0 $w disabled
                }
                return 1
        } elseif {$index_lock_type eq "begin-$type"} {
                set index_lock_type $type
                return 1
        }
        return 0
}

proc unlock_index {} {
        global index_lock_type disable_on_lock

        set index_lock_type none
        foreach w $disable_on_lock {
                uplevel #0 $w normal
        }
}

######################################################################
##
## status

proc repository_state {ctvar hdvar mhvar} {
        global current_branch
        upvar $ctvar ct $hdvar hd $mhvar mh

        set mh [list]

        load_current_branch
        if {[catch {set hd [git rev-parse --verify HEAD]}]} {
                set hd {}
                set ct initial
                return
        }

        set merge_head [gitdir MERGE_HEAD]
        if {[file exists $merge_head]} {
                set ct merge
                set fd_mh [open $merge_head r]
                while {[gets $fd_mh line] >= 0} {
                        lappend mh $line
                }
                close $fd_mh
                return
        }

        set ct normal
}

proc PARENT {} {
        global PARENT empty_tree

        set p [lindex $PARENT 0]
        if {$p ne {}} {
                return $p
        }
        if {$empty_tree eq {}} {
                set empty_tree [git mktree << {}]
        }
        return $empty_tree
}

proc force_amend {} {
        global selected_commit_type
        global HEAD PARENT MERGE_HEAD commit_type

        repository_state newType newHEAD newMERGE_HEAD
        set HEAD $newHEAD
        set PARENT $newHEAD
        set MERGE_HEAD $newMERGE_HEAD
        set commit_type $newType

        set selected_commit_type amend
        do_select_commit_type
}

proc rescan {after {honor_trustmtime 1}} {
        global HEAD PARENT MERGE_HEAD commit_type
        global ui_index ui_workdir ui_comm
        global rescan_active file_states
        global repo_config

        if {$rescan_active > 0 || ![lock_index read]} return

        repository_state newType newHEAD newMERGE_HEAD
        if {[string match amend* $commit_type]
                && $newType eq {normal}
                && $newHEAD eq $HEAD} {
        } else {
                set HEAD $newHEAD
                set PARENT $newHEAD
                set MERGE_HEAD $newMERGE_HEAD
                set commit_type $newType
        }

        array unset file_states

        if {!$::GITGUI_BCK_exists &&
                (![$ui_comm edit modified]
                || [string trim [$ui_comm get 0.0 end]] eq {})} {
                if {[string match amend* $commit_type]} {
                } elseif {[load_message GITGUI_MSG]} {
                } elseif {[run_prepare_commit_msg_hook]} {
                } elseif {[load_message MERGE_MSG]} {
                } elseif {[load_message SQUASH_MSG]} {
                }
                $ui_comm edit reset
                $ui_comm edit modified false
        }

        if {$honor_trustmtime && $repo_config(gui.trustmtime) eq {true}} {
                rescan_stage2 {} $after
        } else {
                set rescan_active 1
                ui_status [mc "Refreshing file status..."]
                set fd_rf [git_read update-index \
                        -q \
                        --unmerged \
                        --ignore-missing \
                        --refresh \
                        ]
                fconfigure $fd_rf -blocking 0 -translation binary
                fileevent $fd_rf readable \
                        [list rescan_stage2 $fd_rf $after]
        }
}

if {[is_Cygwin]} {
        set is_git_info_exclude {}
        proc have_info_exclude {} {
                global is_git_info_exclude

                if {$is_git_info_exclude eq {}} {
                        if {[catch {exec test -f [gitdir info exclude]}]} {
                                set is_git_info_exclude 0
                        } else {
                                set is_git_info_exclude 1
                        }
                }
                return $is_git_info_exclude
        }
} else {
        proc have_info_exclude {} {
                return [file readable [gitdir info exclude]]
        }
}

proc rescan_stage2 {fd after} {
        global rescan_active buf_rdi buf_rdf buf_rlo

        if {$fd ne {}} {
                read $fd
                if {![eof $fd]} return
                close $fd
        }

        set ls_others [list --exclude-per-directory=.gitignore]
        if {[have_info_exclude]} {
                lappend ls_others "--exclude-from=[gitdir info exclude]"
        }
        set user_exclude [get_config core.excludesfile]
        if {$user_exclude ne {} && [file readable $user_exclude]} {
                lappend ls_others "--exclude-from=$user_exclude"
        }

        set buf_rdi {}
        set buf_rdf {}
        set buf_rlo {}

        set rescan_active 3
        ui_status [mc "Scanning for modified files ..."]
        set fd_di [git_read diff-index --cached -z [PARENT]]
        set fd_df [git_read diff-files -z]
        set fd_lo [eval git_read ls-files --others -z $ls_others]

        fconfigure $fd_di -blocking 0 -translation binary -encoding binary
        fconfigure $fd_df -blocking 0 -translation binary -encoding binary
        fconfigure $fd_lo -blocking 0 -translation binary -encoding binary
        fileevent $fd_di readable [list read_diff_index $fd_di $after]
        fileevent $fd_df readable [list read_diff_files $fd_df $after]
        fileevent $fd_lo readable [list read_ls_others $fd_lo $after]
}

proc load_message {file} {
        global ui_comm

        set f [gitdir $file]
        if {[file isfile $f]} {
                if {[catch {set fd [open $f r]}]} {
                        return 0
                }
                fconfigure $fd -eofchar {}
                set content [string trim [read $fd]]
                close $fd
                regsub -all -line {[ \r\t]+$} $content {} content
                $ui_comm delete 0.0 end
                $ui_comm insert end $content
                return 1
        }
        return 0
}

proc run_prepare_commit_msg_hook {} {
        global pch_error

        # prepare-commit-msg requires PREPARE_COMMIT_MSG exist.  From git-gui
        # it will be .git/MERGE_MSG (merge), .git/SQUASH_MSG (squash), or an
        # empty file but existant file.

        set fd_pcm [open [gitdir PREPARE_COMMIT_MSG] a]

        if {[file isfile [gitdir MERGE_MSG]]} {
                set pcm_source "merge"
                set fd_mm [open [gitdir MERGE_MSG] r]
                puts -nonewline $fd_pcm [read $fd_mm]
                close $fd_mm
        } elseif {[file isfile [gitdir SQUASH_MSG]]} {
                set pcm_source "squash"
                set fd_sm [open [gitdir SQUASH_MSG] r]
                puts -nonewline $fd_pcm [read $fd_sm]
                close $fd_sm
        } else {
                set pcm_source ""
        }

        close $fd_pcm

        set fd_ph [githook_read prepare-commit-msg \
                        [gitdir PREPARE_COMMIT_MSG] $pcm_source]
        if {$fd_ph eq {}} {
                catch {file delete [gitdir PREPARE_COMMIT_MSG]}
                return 0;
        }

        ui_status [mc "Calling prepare-commit-msg hook..."]
        set pch_error {}

        fconfigure $fd_ph -blocking 0 -translation binary -eofchar {}
        fileevent $fd_ph readable \
                [list prepare_commit_msg_hook_wait $fd_ph]

        return 1;
}

proc prepare_commit_msg_hook_wait {fd_ph} {
        global pch_error

        append pch_error [read $fd_ph]
        fconfigure $fd_ph -blocking 1
        if {[eof $fd_ph]} {
                if {[catch {close $fd_ph}]} {
                        ui_status [mc "Commit declined by prepare-commit-msg hook."]
                        hook_failed_popup prepare-commit-msg $pch_error
                        catch {file delete [gitdir PREPARE_COMMIT_MSG]}
                        exit 1
                } else {
                        load_message PREPARE_COMMIT_MSG
                }
                set pch_error {}
                catch {file delete [gitdir PREPARE_COMMIT_MSG]}
                return
        }
        fconfigure $fd_ph -blocking 0
        catch {file delete [gitdir PREPARE_COMMIT_MSG]}
}

proc read_diff_index {fd after} {
        global buf_rdi

        append buf_rdi [read $fd]
        set c 0
        set n [string length $buf_rdi]
        while {$c < $n} {
                set z1 [string first "\0" $buf_rdi $c]
                if {$z1 == -1} break
                incr z1
                set z2 [string first "\0" $buf_rdi $z1]
                if {$z2 == -1} break

                incr c
                set i [split [string range $buf_rdi $c [expr {$z1 - 2}]] { }]
                set p [string range $buf_rdi $z1 [expr {$z2 - 1}]]
                merge_state \
                        [encoding convertfrom $p] \
                        [lindex $i 4]? \
                        [list [lindex $i 0] [lindex $i 2]] \
                        [list]
                set c $z2
                incr c
        }
        if {$c < $n} {
                set buf_rdi [string range $buf_rdi $c end]
        } else {
                set buf_rdi {}
        }

        rescan_done $fd buf_rdi $after
}

proc read_diff_files {fd after} {
        global buf_rdf

        append buf_rdf [read $fd]
        set c 0
        set n [string length $buf_rdf]
        while {$c < $n} {
                set z1 [string first "\0" $buf_rdf $c]
                if {$z1 == -1} break
                incr z1
                set z2 [string first "\0" $buf_rdf $z1]
                if {$z2 == -1} break

                incr c
                set i [split [string range $buf_rdf $c [expr {$z1 - 2}]] { }]
                set p [string range $buf_rdf $z1 [expr {$z2 - 1}]]
                merge_state \
                        [encoding convertfrom $p] \
                        ?[lindex $i 4] \
                        [list] \
                        [list [lindex $i 0] [lindex $i 2]]
                set c $z2
                incr c
        }
        if {$c < $n} {
                set buf_rdf [string range $buf_rdf $c end]
        } else {
                set buf_rdf {}
        }

        rescan_done $fd buf_rdf $after
}

proc read_ls_others {fd after} {
        global buf_rlo

        append buf_rlo [read $fd]
        set pck [split $buf_rlo "\0"]
        set buf_rlo [lindex $pck end]
        foreach p [lrange $pck 0 end-1] {
                set p [encoding convertfrom $p]
                if {[string index $p end] eq {/}} {
                        set p [string range $p 0 end-1]
                }
                merge_state $p ?O
        }
        rescan_done $fd buf_rlo $after
}

proc rescan_done {fd buf after} {
        global rescan_active current_diff_path
        global file_states repo_config
        upvar $buf to_clear

        if {![eof $fd]} return
        set to_clear {}
        close $fd
        if {[incr rescan_active -1] > 0} return

        prune_selection
        unlock_index
        display_all_files
        if {$current_diff_path ne {}} reshow_diff
        if {$current_diff_path eq {}} select_first_diff

        uplevel #0 $after
}

proc prune_selection {} {
        global file_states selected_paths

        foreach path [array names selected_paths] {
                if {[catch {set still_here $file_states($path)}]} {
                        unset selected_paths($path)
                }
        }
}

######################################################################
##
## ui helpers

proc mapicon {w state path} {
        global all_icons

        if {[catch {set r $all_icons($state$w)}]} {
                puts "error: no icon for $w state={$state} $path"
                return file_plain
        }
        return $r
}

proc mapdesc {state path} {
        global all_descs

        if {[catch {set r $all_descs($state)}]} {
                puts "error: no desc for state={$state} $path"
                return $state
        }
        return $r
}

proc ui_status {msg} {
        global main_status
        if {[info exists main_status]} {
                $main_status show $msg
        }
}

proc ui_ready {{test {}}} {
        global main_status
        if {[info exists main_status]} {
                $main_status show [mc "Ready."] $test
        }
}

proc escape_path {path} {
        regsub -all {\\} $path "\\\\" path
        regsub -all "\n" $path "\\n" path
        return $path
}

proc short_path {path} {
        return [escape_path [lindex [file split $path] end]]
}

set next_icon_id 0
set null_sha1 [string repeat 0 40]

proc merge_state {path new_state {head_info {}} {index_info {}}} {
        global file_states next_icon_id null_sha1

        set s0 [string index $new_state 0]
        set s1 [string index $new_state 1]

        if {[catch {set info $file_states($path)}]} {
                set state __
                set icon n[incr next_icon_id]
        } else {
                set state [lindex $info 0]
                set icon [lindex $info 1]
                if {$head_info eq {}}  {set head_info  [lindex $info 2]}
                if {$index_info eq {}} {set index_info [lindex $info 3]}
        }

        if     {$s0 eq {?}} {set s0 [string index $state 0]} \
        elseif {$s0 eq {_}} {set s0 _}

        if     {$s1 eq {?}} {set s1 [string index $state 1]} \
        elseif {$s1 eq {_}} {set s1 _}

        if {$s0 eq {A} && $s1 eq {_} && $head_info eq {}} {
                set head_info [list 0 $null_sha1]
        } elseif {$s0 ne {_} && [string index $state 0] eq {_}
                && $head_info eq {}} {
                set head_info $index_info
        }

        set file_states($path) [list $s0$s1 $icon \
                $head_info $index_info \
                ]
        return $state
}

proc display_file_helper {w path icon_name old_m new_m} {
        global file_lists

        if {$new_m eq {_}} {
                set lno [lsearch -sorted -exact $file_lists($w) $path]
                if {$lno >= 0} {
                        set file_lists($w) [lreplace $file_lists($w) $lno $lno]
                        incr lno
                        $w conf -state normal
                        $w delete $lno.0 [expr {$lno + 1}].0
                        $w conf -state disabled
                }
        } elseif {$old_m eq {_} && $new_m ne {_}} {
                lappend file_lists($w) $path
                set file_lists($w) [lsort -unique $file_lists($w)]
                set lno [lsearch -sorted -exact $file_lists($w) $path]
                incr lno
                $w conf -state normal
                $w image create $lno.0 \
                        -align center -padx 5 -pady 1 \
                        -name $icon_name \
                        -image [mapicon $w $new_m $path]
                $w insert $lno.1 "[escape_path $path]\n"
                $w conf -state disabled
        } elseif {$old_m ne $new_m} {
                $w conf -state normal
                $w image conf $icon_name -image [mapicon $w $new_m $path]
                $w conf -state disabled
        }
}

proc display_file {path state} {
        global file_states selected_paths
        global ui_index ui_workdir

        set old_m [merge_state $path $state]
        set s $file_states($path)
        set new_m [lindex $s 0]
        set icon_name [lindex $s 1]

        set o [string index $old_m 0]
        set n [string index $new_m 0]
        if {$o eq {U}} {
                set o _
        }
        if {$n eq {U}} {
                set n _
        }
        display_file_helper     $ui_index $path $icon_name $o $n

        if {[string index $old_m 0] eq {U}} {
                set o U
        } else {
                set o [string index $old_m 1]
        }
        if {[string index $new_m 0] eq {U}} {
                set n U
        } else {
                set n [string index $new_m 1]
        }
        display_file_helper     $ui_workdir $path $icon_name $o $n

        if {$new_m eq {__}} {
                unset file_states($path)
                catch {unset selected_paths($path)}
        }
}

proc display_all_files_helper {w path icon_name m} {
        global file_lists

        lappend file_lists($w) $path
        set lno [expr {[lindex [split [$w index end] .] 0] - 1}]
        $w image create end \
                -align center -padx 5 -pady 1 \
                -name $icon_name \
                -image [mapicon $w $m $path]
        $w insert end "[escape_path $path]\n"
}

proc display_all_files {} {
        global ui_index ui_workdir
        global file_states file_lists
        global last_clicked

        $ui_index conf -state normal
        $ui_workdir conf -state normal

        $ui_index delete 0.0 end
        $ui_workdir delete 0.0 end
        set last_clicked {}

        set file_lists($ui_index) [list]
        set file_lists($ui_workdir) [list]

        foreach path [lsort [array names file_states]] {
                set s $file_states($path)
                set m [lindex $s 0]
                set icon_name [lindex $s 1]

                set s [string index $m 0]
                if {$s ne {U} && $s ne {_}} {
                        display_all_files_helper $ui_index $path \
                                $icon_name $s
                }

                if {[string index $m 0] eq {U}} {
                        set s U
                } else {
                        set s [string index $m 1]
                }
                if {$s ne {_}} {
                        display_all_files_helper $ui_workdir $path \
                                $icon_name $s
                }
        }

        $ui_index conf -state disabled
        $ui_workdir conf -state disabled
}

######################################################################
##
## icons

set filemask {
#define mask_width 14
#define mask_height 15
static unsigned char mask_bits[] = {
   0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f,
   0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f,
   0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f};
}

image create bitmap file_plain -background white -foreground black -data {
#define plain_width 14
#define plain_height 15
static unsigned char plain_bits[] = {
   0xfe, 0x01, 0x02, 0x03, 0x02, 0x05, 0x02, 0x09, 0x02, 0x1f, 0x02, 0x10,
   0x02, 0x10, 0x02, 0x10, 0x02, 0x10, 0x02, 0x10, 0x02, 0x10, 0x02, 0x10,
   0x02, 0x10, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_mod -background white -foreground blue -data {
#define mod_width 14
#define mod_height 15
static unsigned char mod_bits[] = {
   0xfe, 0x01, 0x02, 0x03, 0x7a, 0x05, 0x02, 0x09, 0x7a, 0x1f, 0x02, 0x10,
   0xfa, 0x17, 0x02, 0x10, 0xfa, 0x17, 0x02, 0x10, 0xfa, 0x17, 0x02, 0x10,
   0xfa, 0x17, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_fulltick -background white -foreground "#007000" -data {
#define file_fulltick_width 14
#define file_fulltick_height 15
static unsigned char file_fulltick_bits[] = {
   0xfe, 0x01, 0x02, 0x1a, 0x02, 0x0c, 0x02, 0x0c, 0x02, 0x16, 0x02, 0x16,
   0x02, 0x13, 0x00, 0x13, 0x86, 0x11, 0x8c, 0x11, 0xd8, 0x10, 0xf2, 0x10,
   0x62, 0x10, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_parttick -background white -foreground "#005050" -data {
#define parttick_width 14
#define parttick_height 15
static unsigned char parttick_bits[] = {
   0xfe, 0x01, 0x02, 0x03, 0x7a, 0x05, 0x02, 0x09, 0x7a, 0x1f, 0x02, 0x10,
   0x7a, 0x14, 0x02, 0x16, 0x02, 0x13, 0x8a, 0x11, 0xda, 0x10, 0x72, 0x10,
   0x22, 0x10, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_question -background white -foreground black -data {
#define file_question_width 14
#define file_question_height 15
static unsigned char file_question_bits[] = {
   0xfe, 0x01, 0x02, 0x02, 0xe2, 0x04, 0xf2, 0x09, 0x1a, 0x1b, 0x0a, 0x13,
   0x82, 0x11, 0xc2, 0x10, 0x62, 0x10, 0x62, 0x10, 0x02, 0x10, 0x62, 0x10,
   0x62, 0x10, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_removed -background white -foreground red -data {
#define file_removed_width 14
#define file_removed_height 15
static unsigned char file_removed_bits[] = {
   0xfe, 0x01, 0x02, 0x03, 0x02, 0x05, 0x02, 0x09, 0x02, 0x1f, 0x02, 0x10,
   0x1a, 0x16, 0x32, 0x13, 0xe2, 0x11, 0xc2, 0x10, 0xe2, 0x11, 0x32, 0x13,
   0x1a, 0x16, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_merge -background white -foreground blue -data {
#define file_merge_width 14
#define file_merge_height 15
static unsigned char file_merge_bits[] = {
   0xfe, 0x01, 0x02, 0x03, 0x62, 0x05, 0x62, 0x09, 0x62, 0x1f, 0x62, 0x10,
   0xfa, 0x11, 0xf2, 0x10, 0x62, 0x10, 0x02, 0x10, 0xfa, 0x17, 0x02, 0x10,
   0xfa, 0x17, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_statechange -background white -foreground green -data {
#define file_merge_width 14
#define file_merge_height 15
static unsigned char file_statechange_bits[] = {
   0xfe, 0x01, 0x02, 0x03, 0x02, 0x05, 0x02, 0x09, 0x02, 0x1f, 0x62, 0x10,
   0x62, 0x10, 0xba, 0x11, 0xba, 0x11, 0x62, 0x10, 0x62, 0x10, 0x02, 0x10,
   0x02, 0x10, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

set ui_index .vpane.files.index.list
set ui_workdir .vpane.files.workdir.list

set all_icons(_$ui_index)   file_plain
set all_icons(A$ui_index)   file_fulltick
set all_icons(M$ui_index)   file_fulltick
set all_icons(D$ui_index)   file_removed
set all_icons(U$ui_index)   file_merge
set all_icons(T$ui_index)   file_statechange

set all_icons(_$ui_workdir) file_plain
set all_icons(M$ui_workdir) file_mod
set all_icons(D$ui_workdir) file_question
set all_icons(U$ui_workdir) file_merge
set all_icons(O$ui_workdir) file_plain
set all_icons(T$ui_workdir) file_statechange

set max_status_desc 0
foreach i {
                {__ {mc "Unmodified"}}

                {_M {mc "Modified, not staged"}}
                {M_ {mc "Staged for commit"}}
                {MM {mc "Portions staged for commit"}}
                {MD {mc "Staged for commit, missing"}}

                {_T {mc "File type changed, not staged"}}
                {T_ {mc "File type changed, staged"}}

                {_O {mc "Untracked, not staged"}}
                {A_ {mc "Staged for commit"}}
                {AM {mc "Portions staged for commit"}}
                {AD {mc "Staged for commit, missing"}}

                {_D {mc "Missing"}}
                {D_ {mc "Staged for removal"}}
                {DO {mc "Staged for removal, still present"}}

                {_U {mc "Requires merge resolution"}}
                {U_ {mc "Requires merge resolution"}}
                {UU {mc "Requires merge resolution"}}
                {UM {mc "Requires merge resolution"}}
                {UD {mc "Requires merge resolution"}}
                {UT {mc "Requires merge resolution"}}
        } {
        set text [eval [lindex $i 1]]
        if {$max_status_desc < [string length $text]} {
                set max_status_desc [string length $text]
        }
        set all_descs([lindex $i 0]) $text
}
unset i

######################################################################
##
## util

proc scrollbar2many {list mode args} {
        foreach w $list {eval $w $mode $args}
}

proc many2scrollbar {list mode sb top bottom} {
        $sb set $top $bottom
        foreach w $list {$w $mode moveto $top}
}

proc incr_font_size {font {amt 1}} {
        set sz [font configure $font -size]
        incr sz $amt
        font configure $font -size $sz
        font configure ${font}bold -size $sz
        font configure ${font}italic -size $sz
}

######################################################################
##
## ui commands

set starting_gitk_msg [mc "Starting gitk... please wait..."]

proc do_gitk {revs} {
        # -- Always start gitk through whatever we were loaded with.  This
        #    lets us bypass using shell process on Windows systems.
        #
        set exe [_which gitk -script]
        set cmd [list [info nameofexecutable] $exe]
        if {$exe eq {}} {
                error_popup [mc "Couldn't find gitk in PATH"]
        } else {
                global env

                if {[info exists env(GIT_DIR)]} {
                        set old_GIT_DIR $env(GIT_DIR)
                } else {
                        set old_GIT_DIR {}
                }

                set pwd [pwd]
                cd [file dirname [gitdir]]
                set env(GIT_DIR) [file tail [gitdir]]

                eval exec $cmd $revs &

                if {$old_GIT_DIR eq {}} {
                        unset env(GIT_DIR)
                } else {
                        set env(GIT_DIR) $old_GIT_DIR
                }
                cd $pwd

                ui_status $::starting_gitk_msg
                after 10000 {
                        ui_ready $starting_gitk_msg
                }
        }
}

proc do_explore {} {
        set explorer {}
        if {[is_Cygwin] || [is_Windows]} {
                set explorer "explorer.exe"
        } elseif {[is_MacOSX]} {
                set explorer "open"
        } else {
                # freedesktop.org-conforming system is our best shot
                set explorer "xdg-open"
        }
        eval exec $explorer [file dirname [gitdir]] &
}

set is_quitting 0
set ret_code    1

proc terminate_me {win} {
        global ret_code
        if {$win ne {.}} return
        exit $ret_code
}

proc do_quit {{rc {1}}} {
        global ui_comm is_quitting repo_config commit_type
        global GITGUI_BCK_exists GITGUI_BCK_i
        global ui_comm_spell
        global ret_code

        if {$is_quitting} return
        set is_quitting 1

        if {[winfo exists $ui_comm]} {
                # -- Stash our current commit buffer.
                #
                set save [gitdir GITGUI_MSG]
                if {$GITGUI_BCK_exists && ![$ui_comm edit modified]} {
                        file rename -force [gitdir GITGUI_BCK] $save
                        set GITGUI_BCK_exists 0
                } else {
                        set msg [string trim [$ui_comm get 0.0 end]]
                        regsub -all -line {[ \r\t]+$} $msg {} msg
                        if {(![string match amend* $commit_type]
                                || [$ui_comm edit modified])
                                && $msg ne {}} {
                                catch {
                                        set fd [open $save w]
                                        puts -nonewline $fd $msg
                                        close $fd
                                }
                        } else {
                                catch {file delete $save}
                        }
                }

                # -- Cancel our spellchecker if its running.
                #
                if {[info exists ui_comm_spell]} {
                        $ui_comm_spell stop
                }

                # -- Remove our editor backup, its not needed.
                #
                after cancel $GITGUI_BCK_i
                if {$GITGUI_BCK_exists} {
                        catch {file delete [gitdir GITGUI_BCK]}
                }

                # -- Stash our current window geometry into this repository.
                #
                set cfg_geometry [list]
                lappend cfg_geometry [wm geometry .]
                lappend cfg_geometry [lindex [.vpane sash coord 0] 0]
                lappend cfg_geometry [lindex [.vpane.files sash coord 0] 1]
                if {[catch {set rc_geometry $repo_config(gui.geometry)}]} {
                        set rc_geometry {}
                }
                if {$cfg_geometry ne $rc_geometry} {
                        catch {git config gui.geometry $cfg_geometry}
                }
        }

        set ret_code $rc
        destroy .
}

proc do_rescan {} {
        rescan ui_ready
}

proc ui_do_rescan {} {
        rescan {force_first_diff; ui_ready}
}

proc do_commit {} {
        commit_tree
}

proc next_diff {} {
        global next_diff_p next_diff_w next_diff_i
        show_diff $next_diff_p $next_diff_w {}
}

proc find_anchor_pos {lst name} {
        set lid [lsearch -sorted -exact $lst $name]

        if {$lid == -1} {
                set lid 0
                foreach lname $lst {
                        if {$lname >= $name} break
                        incr lid
                }
        }

        return $lid
}

proc find_file_from {flist idx delta path mmask} {
        global file_states

        set len [llength $flist]
        while {$idx >= 0 && $idx < $len} {
                set name [lindex $flist $idx]

                if {$name ne $path && [info exists file_states($name)]} {
                        set state [lindex $file_states($name) 0]

                        if {$mmask eq {} || [regexp $mmask $state]} {
                                return $idx
                        }
                }

                incr idx $delta
        }

        return {}
}

proc find_next_diff {w path {lno {}} {mmask {}}} {
        global next_diff_p next_diff_w next_diff_i
        global file_lists ui_index ui_workdir

        set flist $file_lists($w)
        if {$lno eq {}} {
                set lno [find_anchor_pos $flist $path]
        } else {
                incr lno -1
        }

        if {$mmask ne {} && ![regexp {(^\^)|(\$$)} $mmask]} {
                if {$w eq $ui_index} {
                        set mmask "^$mmask"
                } else {
                        set mmask "$mmask\$"
                }
        }

        set idx [find_file_from $flist $lno 1 $path $mmask]
        if {$idx eq {}} {
                incr lno -1
                set idx [find_file_from $flist $lno -1 $path $mmask]
        }

        if {$idx ne {}} {
                set next_diff_w $w
                set next_diff_p [lindex $flist $idx]
                set next_diff_i [expr {$idx+1}]
                return 1
        } else {
                return 0
        }
}

proc next_diff_after_action {w path {lno {}} {mmask {}}} {
        global current_diff_path

        if {$path ne $current_diff_path} {
                return {}
        } elseif {[find_next_diff $w $path $lno $mmask]} {
                return {next_diff;}
        } else {
                return {reshow_diff;}
        }
}

proc select_first_diff {} {
        global ui_workdir

        if {[find_next_diff $ui_workdir {} 1 {^_?U}] ||
            [find_next_diff $ui_workdir {} 1 {[^O]$}]} {
                next_diff
        }
}

proc force_first_diff {} {
        global current_diff_path

        if {[info exists file_states($current_diff_path)]} {
                set state [lindex $file_states($current_diff_path) 0]

                if {[string index $state 1] ne {O}} return
        }

        select_first_diff
}

proc toggle_or_diff {w x y} {
        global file_states file_lists current_diff_path ui_index ui_workdir
        global last_clicked selected_paths

        set pos [split [$w index @$x,$y] .]
        set lno [lindex $pos 0]
        set col [lindex $pos 1]
        set path [lindex $file_lists($w) [expr {$lno - 1}]]
        if {$path eq {}} {
                set last_clicked {}
                return
        }

        set last_clicked [list $w $lno]
        array unset selected_paths
        $ui_index tag remove in_sel 0.0 end
        $ui_workdir tag remove in_sel 0.0 end

        # Determine the state of the file
        if {[info exists file_states($path)]} {
                set state [lindex $file_states($path) 0]
        } else {
                set state {__}
        }

        # Restage the file, or simply show the diff
        if {$col == 0 && $y > 1} {
                # Conflicts need special handling
                if {[string first {U} $state] >= 0} {
                        # $w must always be $ui_workdir, but...
                        if {$w ne $ui_workdir} { set lno {} }
                        merge_stage_workdir $path $lno
                        return
                }

                if {[string index $state 1] eq {O}} {
                        set mmask {}
                } else {
                        set mmask {[^O]}
                }

                set after [next_diff_after_action $w $path $lno $mmask]

                if {$w eq $ui_index} {
                        update_indexinfo \
                                "Unstaging [short_path $path] from commit" \
                                [list $path] \
                                [concat $after [list ui_ready]]
                } elseif {$w eq $ui_workdir} {
                        update_index \
                                "Adding [short_path $path]" \
                                [list $path] \
                                [concat $after [list ui_ready]]
                }
        } else {
                show_diff $path $w $lno
        }
}

proc add_one_to_selection {w x y} {
        global file_lists last_clicked selected_paths

        set lno [lindex [split [$w index @$x,$y] .] 0]
        set path [lindex $file_lists($w) [expr {$lno - 1}]]
        if {$path eq {}} {
                set last_clicked {}
                return
        }

        if {$last_clicked ne {}
                && [lindex $last_clicked 0] ne $w} {
                array unset selected_paths
                [lindex $last_clicked 0] tag remove in_sel 0.0 end
        }

        set last_clicked [list $w $lno]
        if {[catch {set in_sel $selected_paths($path)}]} {
                set in_sel 0
        }
        if {$in_sel} {
                unset selected_paths($path)
                $w tag remove in_sel $lno.0 [expr {$lno + 1}].0
        } else {
                set selected_paths($path) 1
                $w tag add in_sel $lno.0 [expr {$lno + 1}].0
        }
}

proc add_range_to_selection {w x y} {
        global file_lists last_clicked selected_paths

        if {[lindex $last_clicked 0] ne $w} {
                toggle_or_diff $w $x $y
                return
        }

        set lno [lindex [split [$w index @$x,$y] .] 0]
        set lc [lindex $last_clicked 1]
        if {$lc < $lno} {
                set begin $lc
                set end $lno
        } else {
                set begin $lno
                set end $lc
        }

        foreach path [lrange $file_lists($w) \
                [expr {$begin - 1}] \
                [expr {$end - 1}]] {
                set selected_paths($path) 1
        }
        $w tag add in_sel $begin.0 [expr {$end + 1}].0
}

proc show_more_context {} {
        global repo_config
        if {$repo_config(gui.diffcontext) < 99} {
                incr repo_config(gui.diffcontext)
                reshow_diff
        }
}

proc show_less_context {} {
        global repo_config
        if {$repo_config(gui.diffcontext) > 1} {
                incr repo_config(gui.diffcontext) -1
                reshow_diff
        }
}

######################################################################
##
## ui construction

load_config 0
apply_config
set ui_comm {}

# -- Menu Bar
#
menu .mbar -tearoff 0
.mbar add cascade -label [mc Repository] -menu .mbar.repository
.mbar add cascade -label [mc Edit] -menu .mbar.edit
if {[is_enabled branch]} {
        .mbar add cascade -label [mc Branch] -menu .mbar.branch
}
if {[is_enabled multicommit] || [is_enabled singlecommit]} {
        .mbar add cascade -label [mc Commit@@noun] -menu .mbar.commit
}
if {[is_enabled transport]} {
        .mbar add cascade -label [mc Merge] -menu .mbar.merge
        .mbar add cascade -label [mc Remote] -menu .mbar.remote
}
. configure -menu .mbar

# -- Repository Menu
#
menu .mbar.repository

.mbar.repository add command \
        -label [mc "Explore Working Copy"] \
        -command {do_explore}
.mbar.repository add separator

.mbar.repository add command \
        -label [mc "Browse Current Branch's Files"] \
        -command {browser::new $current_branch}
set ui_browse_current [.mbar.repository index last]
.mbar.repository add command \
        -label [mc "Browse Branch Files..."] \
        -command browser_open::dialog
.mbar.repository add separator

.mbar.repository add command \
        -label [mc "Visualize Current Branch's History"] \
        -command {do_gitk $current_branch}
set ui_visualize_current [.mbar.repository index last]
.mbar.repository add command \
        -label [mc "Visualize All Branch History"] \
        -command {do_gitk --all}
.mbar.repository add separator

proc current_branch_write {args} {
        global current_branch
        .mbar.repository entryconf $::ui_browse_current \
                -label [mc "Browse %s's Files" $current_branch]
        .mbar.repository entryconf $::ui_visualize_current \
                -label [mc "Visualize %s's History" $current_branch]
}
trace add variable current_branch write current_branch_write

if {[is_enabled multicommit]} {
        .mbar.repository add command -label [mc "Database Statistics"] \
                -command do_stats

        .mbar.repository add command -label [mc "Compress Database"] \
                -command do_gc

        .mbar.repository add command -label [mc "Verify Database"] \
                -command do_fsck_objects

        .mbar.repository add separator

        if {[is_Cygwin]} {
                .mbar.repository add command \
                        -label [mc "Create Desktop Icon"] \
                        -command do_cygwin_shortcut
        } elseif {[is_Windows]} {
                .mbar.repository add command \
                        -label [mc "Create Desktop Icon"] \
                        -command do_windows_shortcut
        } elseif {[is_MacOSX]} {
                .mbar.repository add command \
                        -label [mc "Create Desktop Icon"] \
                        -command do_macosx_app
        }
}

if {[is_MacOSX]} {
        proc ::tk::mac::Quit {args} { do_quit }
} else {
        .mbar.repository add command -label [mc Quit] \
                -command do_quit \
                -accelerator $M1T-Q
}

# -- Edit Menu
#
menu .mbar.edit
.mbar.edit add command -label [mc Undo] \
        -command {catch {[focus] edit undo}} \
        -accelerator $M1T-Z
.mbar.edit add command -label [mc Redo] \
        -command {catch {[focus] edit redo}} \
        -accelerator $M1T-Y
.mbar.edit add separator
.mbar.edit add command -label [mc Cut] \
        -command {catch {tk_textCut [focus]}} \
        -accelerator $M1T-X
.mbar.edit add command -label [mc Copy] \
        -command {catch {tk_textCopy [focus]}} \
        -accelerator $M1T-C
.mbar.edit add command -label [mc Paste] \
        -command {catch {tk_textPaste [focus]; [focus] see insert}} \
        -accelerator $M1T-V
.mbar.edit add command -label [mc Delete] \
        -command {catch {[focus] delete sel.first sel.last}} \
        -accelerator Del
.mbar.edit add separator
.mbar.edit add command -label [mc "Select All"] \
        -command {catch {[focus] tag add sel 0.0 end}} \
        -accelerator $M1T-A

# -- Branch Menu
#
if {[is_enabled branch]} {
        menu .mbar.branch

        .mbar.branch add command -label [mc "Create..."] \
                -command branch_create::dialog \
                -accelerator $M1T-N
        lappend disable_on_lock [list .mbar.branch entryconf \
                [.mbar.branch index last] -state]

        .mbar.branch add command -label [mc "Checkout..."] \
                -command branch_checkout::dialog \
                -accelerator $M1T-O
        lappend disable_on_lock [list .mbar.branch entryconf \
                [.mbar.branch index last] -state]

        .mbar.branch add command -label [mc "Rename..."] \
                -command branch_rename::dialog
        lappend disable_on_lock [list .mbar.branch entryconf \
                [.mbar.branch index last] -state]

        .mbar.branch add command -label [mc "Delete..."] \
                -command branch_delete::dialog
        lappend disable_on_lock [list .mbar.branch entryconf \
                [.mbar.branch index last] -state]

        .mbar.branch add command -label [mc "Reset..."] \
                -command merge::reset_hard
        lappend disable_on_lock [list .mbar.branch entryconf \
                [.mbar.branch index last] -state]
}

# -- Commit Menu
#
proc commit_btn_caption {} {
        if {[is_enabled nocommit]} {
                return [mc "Done"]
        } else {
                return [mc Commit@@verb]
        }
}

if {[is_enabled multicommit] || [is_enabled singlecommit]} {
        menu .mbar.commit

        if {![is_enabled nocommit]} {
                .mbar.commit add radiobutton \
                        -label [mc "New Commit"] \
                        -command do_select_commit_type \
                        -variable selected_commit_type \
                        -value new
                lappend disable_on_lock \
                        [list .mbar.commit entryconf [.mbar.commit index last] -state]

                .mbar.commit add radiobutton \
                        -label [mc "Amend Last Commit"] \
                        -command do_select_commit_type \
                        -variable selected_commit_type \
                        -value amend
                lappend disable_on_lock \
                        [list .mbar.commit entryconf [.mbar.commit index last] -state]

                .mbar.commit add separator
        }

        .mbar.commit add command -label [mc Rescan] \
                -command ui_do_rescan \
                -accelerator F5
        lappend disable_on_lock \
                [list .mbar.commit entryconf [.mbar.commit index last] -state]

        .mbar.commit add command -label [mc "Stage To Commit"] \
                -command do_add_selection \
                -accelerator $M1T-T
        lappend disable_on_lock \
                [list .mbar.commit entryconf [.mbar.commit index last] -state]

        .mbar.commit add command -label [mc "Stage Changed Files To Commit"] \
                -command do_add_all \
                -accelerator $M1T-I
        lappend disable_on_lock \
                [list .mbar.commit entryconf [.mbar.commit index last] -state]

        .mbar.commit add command -label [mc "Unstage From Commit"] \
                -command do_unstage_selection
        lappend disable_on_lock \
                [list .mbar.commit entryconf [.mbar.commit index last] -state]

        .mbar.commit add command -label [mc "Revert Changes"] \
                -command do_revert_selection
        lappend disable_on_lock \
                [list .mbar.commit entryconf [.mbar.commit index last] -state]

        .mbar.commit add separator

        .mbar.commit add command -label [mc "Show Less Context"] \
                -command show_less_context \
                -accelerator $M1T-\-

        .mbar.commit add command -label [mc "Show More Context"] \
                -command show_more_context \
                -accelerator $M1T-=

        .mbar.commit add separator

        if {![is_enabled nocommitmsg]} {
                .mbar.commit add command -label [mc "Sign Off"] \
                        -command do_signoff \
                        -accelerator $M1T-S
        }

        .mbar.commit add command -label [commit_btn_caption] \
                -command do_commit \
                -accelerator $M1T-Return
        lappend disable_on_lock \
                [list .mbar.commit entryconf [.mbar.commit index last] -state]
}

# -- Merge Menu
#
if {[is_enabled branch]} {
        menu .mbar.merge
        .mbar.merge add command -label [mc "Local Merge..."] \
                -command merge::dialog \
                -accelerator $M1T-M
        lappend disable_on_lock \
                [list .mbar.merge entryconf [.mbar.merge index last] -state]
        .mbar.merge add command -label [mc "Abort Merge..."] \
                -command merge::reset_hard
        lappend disable_on_lock \
                [list .mbar.merge entryconf [.mbar.merge index last] -state]
}

# -- Transport Menu
#
if {[is_enabled transport]} {
        menu .mbar.remote

        .mbar.remote add command \
                -label [mc "Add..."] \
                -command remote_add::dialog \
                -accelerator $M1T-A
        .mbar.remote add command \
                -label [mc "Push..."] \
                -command do_push_anywhere \
                -accelerator $M1T-P
        .mbar.remote add command \
                -label [mc "Delete Branch..."] \
                -command remote_branch_delete::dialog
}

if {[is_MacOSX]} {
        # -- Apple Menu (Mac OS X only)
        #
        .mbar add cascade -label Apple -menu .mbar.apple
        menu .mbar.apple

        .mbar.apple add command -label [mc "About %s" [appname]] \
                -command do_about
        .mbar.apple add separator
        .mbar.apple add command \
                -label [mc "Preferences..."] \
                -command do_options \
                -accelerator $M1T-,
        bind . <$M1B-,> do_options
} else {
        # -- Edit Menu
        #
        .mbar.edit add separator
        .mbar.edit add command -label [mc "Options..."] \
                -command do_options
}

# -- Help Menu
#
.mbar add cascade -label [mc Help] -menu .mbar.help
menu .mbar.help

if {![is_MacOSX]} {
        .mbar.help add command -label [mc "About %s" [appname]] \
                -command do_about
}


set doc_path [file dirname [gitexec]]
set doc_path [file join $doc_path Documentation index.html]

if {[is_Cygwin]} {
        set doc_path [exec cygpath --mixed $doc_path]
}

if {[file isfile $doc_path]} {
        set doc_url "file:$doc_path"
} else {
        set doc_url {http://www.kernel.org/pub/software/scm/git/docs/}
}

proc start_browser {url} {
        git "web--browse" $url
}

.mbar.help add command -label [mc "Online Documentation"] \
        -command [list start_browser $doc_url]
unset doc_path doc_url

# -- Standard bindings
#
wm protocol . WM_DELETE_WINDOW do_quit
bind all <$M1B-Key-q> do_quit
bind all <$M1B-Key-Q> do_quit
bind all <$M1B-Key-w> {destroy [winfo toplevel %W]}
bind all <$M1B-Key-W> {destroy [winfo toplevel %W]}

set subcommand_args {}
proc usage {} {
        puts stderr "usage: $::argv0 $::subcommand $::subcommand_args"
        exit 1
}

# -- Not a normal commit type invocation?  Do that instead!
#
switch -- $subcommand {
browser -
blame {
        if {$subcommand eq "blame"} {
                set subcommand_args {[--line=<num>] rev? path}
        } else {
                set subcommand_args {rev? path}
        }
        if {$argv eq {}} usage
        set head {}
        set path {}
        set jump_spec {}
        set is_path 0
        foreach a $argv {
                if {$is_path || [file exists $_prefix$a]} {
                        if {$path ne {}} usage
                        set path $_prefix$a
                        break
                } elseif {$a eq {--}} {
                        if {$path ne {}} {
                                if {$head ne {}} usage
                                set head $path
                                set path {}
                        }
                        set is_path 1
                } elseif {[regexp {^--line=(\d+)$} $a a lnum]} {
                        if {$jump_spec ne {} || $head ne {}} usage
                        set jump_spec [list $lnum]
                } elseif {$head eq {}} {
                        if {$head ne {}} usage
                        set head $a
                        set is_path 1
                } else {
                        usage
                }
        }
        unset is_path

        if {$head ne {} && $path eq {}} {
                set path $_prefix$head
                set head {}
        }

        if {$head eq {}} {
                load_current_branch
        } else {
                if {[regexp {^[0-9a-f]{1,39}$} $head]} {
                        if {[catch {
                                        set head [git rev-parse --verify $head]
                                } err]} {
                                puts stderr $err
                                exit 1
                        }
                }
                set current_branch $head
        }

        switch -- $subcommand {
        browser {
                if {$jump_spec ne {}} usage
                if {$head eq {}} {
                        if {$path ne {} && [file isdirectory $path]} {
                                set head $current_branch
                        } else {
                                set head $path
                                set path {}
                        }
                }
                browser::new $head $path
        }
        blame   {
                if {$head eq {} && ![file exists $path]} {
                        puts stderr [mc "fatal: cannot stat path %s: No such file or directory" $path]
                        exit 1
                }
                blame::new $head $path $jump_spec
        }
        }
        return
}
citool -
gui {
        if {[llength $argv] != 0} {
                puts -nonewline stderr "usage: $argv0"
                if {$subcommand ne {gui}
                        && [file tail $argv0] ne "git-$subcommand"} {
                        puts -nonewline stderr " $subcommand"
                }
                puts stderr {}
                exit 1
        }
        # fall through to setup UI for commits
}
default {
        puts stderr "usage: $argv0 \[{blame|browser|citool}\]"
        exit 1
}
}

# -- Branch Control
#
frame .branch \
        -borderwidth 1 \
        -relief sunken
label .branch.l1 \
        -text [mc "Current Branch:"] \
        -anchor w \
        -justify left
label .branch.cb \
        -textvariable current_branch \
        -anchor w \
        -justify left
pack .branch.l1 -side left
pack .branch.cb -side left -fill x
pack .branch -side top -fill x

# -- Main Window Layout
#
panedwindow .vpane -orient horizontal
panedwindow .vpane.files -orient vertical
.vpane add .vpane.files -sticky nsew -height 100 -width 200
pack .vpane -anchor n -side top -fill both -expand 1

# -- Index File List
#
frame .vpane.files.index -height 100 -width 200
label .vpane.files.index.title -text [mc "Staged Changes (Will Commit)"] \
        -background lightgreen -foreground black
text $ui_index -background white -foreground black \
        -borderwidth 0 \
        -width 20 -height 10 \
        -wrap none \
        -cursor $cursor_ptr \
        -xscrollcommand {.vpane.files.index.sx set} \
        -yscrollcommand {.vpane.files.index.sy set} \
        -state disabled
scrollbar .vpane.files.index.sx -orient h -command [list $ui_index xview]
scrollbar .vpane.files.index.sy -orient v -command [list $ui_index yview]
pack .vpane.files.index.title -side top -fill x
pack .vpane.files.index.sx -side bottom -fill x
pack .vpane.files.index.sy -side right -fill y
pack $ui_index -side left -fill both -expand 1

# -- Working Directory File List
#
frame .vpane.files.workdir -height 100 -width 200
label .vpane.files.workdir.title -text [mc "Unstaged Changes"] \
        -background lightsalmon -foreground black
text $ui_workdir -background white -foreground black \
        -borderwidth 0 \
        -width 20 -height 10 \
        -wrap none \
        -cursor $cursor_ptr \
        -xscrollcommand {.vpane.files.workdir.sx set} \
        -yscrollcommand {.vpane.files.workdir.sy set} \
        -state disabled
scrollbar .vpane.files.workdir.sx -orient h -command [list $ui_workdir xview]
scrollbar .vpane.files.workdir.sy -orient v -command [list $ui_workdir yview]
pack .vpane.files.workdir.title -side top -fill x
pack .vpane.files.workdir.sx -side bottom -fill x
pack .vpane.files.workdir.sy -side right -fill y
pack $ui_workdir -side left -fill both -expand 1

.vpane.files add .vpane.files.workdir -sticky nsew
.vpane.files add .vpane.files.index -sticky nsew

foreach i [list $ui_index $ui_workdir] {
        rmsel_tag $i
        $i tag conf in_diff -background [$i tag cget in_sel -background]
}
unset i

# -- Diff and Commit Area
#
frame .vpane.lower -height 300 -width 400
frame .vpane.lower.commarea
frame .vpane.lower.diff -relief sunken -borderwidth 1
pack .vpane.lower.diff -fill both -expand 1
pack .vpane.lower.commarea -side bottom -fill x
.vpane add .vpane.lower -sticky nsew

# -- Commit Area Buttons
#
frame .vpane.lower.commarea.buttons
label .vpane.lower.commarea.buttons.l -text {} \
        -anchor w \
        -justify left
pack .vpane.lower.commarea.buttons.l -side top -fill x
pack .vpane.lower.commarea.buttons -side left -fill y

button .vpane.lower.commarea.buttons.rescan -text [mc Rescan] \
        -command ui_do_rescan
pack .vpane.lower.commarea.buttons.rescan -side top -fill x
lappend disable_on_lock \
        {.vpane.lower.commarea.buttons.rescan conf -state}

button .vpane.lower.commarea.buttons.incall -text [mc "Stage Changed"] \
        -command do_add_all
pack .vpane.lower.commarea.buttons.incall -side top -fill x
lappend disable_on_lock \
        {.vpane.lower.commarea.buttons.incall conf -state}

if {![is_enabled nocommitmsg]} {
        button .vpane.lower.commarea.buttons.signoff -text [mc "Sign Off"] \
                -command do_signoff
        pack .vpane.lower.commarea.buttons.signoff -side top -fill x
}

button .vpane.lower.commarea.buttons.commit -text [commit_btn_caption] \
        -command do_commit
pack .vpane.lower.commarea.buttons.commit -side top -fill x
lappend disable_on_lock \
        {.vpane.lower.commarea.buttons.commit conf -state}

if {![is_enabled nocommit]} {
        button .vpane.lower.commarea.buttons.push -text [mc Push] \
                -command do_push_anywhere
        pack .vpane.lower.commarea.buttons.push -side top -fill x
}

# -- Commit Message Buffer
#
frame .vpane.lower.commarea.buffer
frame .vpane.lower.commarea.buffer.header
set ui_comm .vpane.lower.commarea.buffer.t
set ui_coml .vpane.lower.commarea.buffer.header.l

if {![is_enabled nocommit]} {
        radiobutton .vpane.lower.commarea.buffer.header.new \
                -text [mc "New Commit"] \
                -command do_select_commit_type \
                -variable selected_commit_type \
                -value new
        lappend disable_on_lock \
                [list .vpane.lower.commarea.buffer.header.new conf -state]
        radiobutton .vpane.lower.commarea.buffer.header.amend \
                -text [mc "Amend Last Commit"] \
                -command do_select_commit_type \
                -variable selected_commit_type \
                -value amend
        lappend disable_on_lock \
                [list .vpane.lower.commarea.buffer.header.amend conf -state]
}

label $ui_coml \
        -anchor w \
        -justify left
proc trace_commit_type {varname args} {
        global ui_coml commit_type
        switch -glob -- $commit_type {
        initial       {set txt [mc "Initial Commit Message:"]}
        amend         {set txt [mc "Amended Commit Message:"]}
        amend-initial {set txt [mc "Amended Initial Commit Message:"]}
        amend-merge   {set txt [mc "Amended Merge Commit Message:"]}
        merge         {set txt [mc "Merge Commit Message:"]}
        *             {set txt [mc "Commit Message:"]}
        }
        $ui_coml conf -text $txt
}
trace add variable commit_type write trace_commit_type
pack $ui_coml -side left -fill x

if {![is_enabled nocommit]} {
        pack .vpane.lower.commarea.buffer.header.amend -side right
        pack .vpane.lower.commarea.buffer.header.new -side right
}

text $ui_comm -background white -foreground black \
        -borderwidth 1 \
        -undo true \
        -maxundo 20 \
        -autoseparators true \
        -relief sunken \
        -width $repo_config(gui.commitmsgwidth) -height 9 -wrap none \
        -font font_diff \
        -yscrollcommand {.vpane.lower.commarea.buffer.sby set}
scrollbar .vpane.lower.commarea.buffer.sby \
        -command [list $ui_comm yview]
pack .vpane.lower.commarea.buffer.header -side top -fill x
pack .vpane.lower.commarea.buffer.sby -side right -fill y
pack $ui_comm -side left -fill y
pack .vpane.lower.commarea.buffer -side left -fill y

# -- Commit Message Buffer Context Menu
#
set ctxm .vpane.lower.commarea.buffer.ctxm
menu $ctxm -tearoff 0
$ctxm add command \
        -label [mc Cut] \
        -command {tk_textCut $ui_comm}
$ctxm add command \
        -label [mc Copy] \
        -command {tk_textCopy $ui_comm}
$ctxm add command \
        -label [mc Paste] \
        -command {tk_textPaste $ui_comm}
$ctxm add command \
        -label [mc Delete] \
        -command {$ui_comm delete sel.first sel.last}
$ctxm add separator
$ctxm add command \
        -label [mc "Select All"] \
        -command {focus $ui_comm;$ui_comm tag add sel 0.0 end}
$ctxm add command \
        -label [mc "Copy All"] \
        -command {
                $ui_comm tag add sel 0.0 end
                tk_textCopy $ui_comm
                $ui_comm tag remove sel 0.0 end
        }
$ctxm add separator
$ctxm add command \
        -label [mc "Sign Off"] \
        -command do_signoff
set ui_comm_ctxm $ctxm

# -- Diff Header
#
proc trace_current_diff_path {varname args} {
        global current_diff_path diff_actions file_states
        if {$current_diff_path eq {}} {
                set s {}
                set f {}
                set p {}
                set o disabled
        } else {
                set p $current_diff_path
                set s [mapdesc [lindex $file_states($p) 0] $p]
                set f [mc "File:"]
                set p [escape_path $p]
                set o normal
        }

        .vpane.lower.diff.header.status configure -text $s
        .vpane.lower.diff.header.file configure -text $f
        .vpane.lower.diff.header.path configure -text $p
        foreach w $diff_actions {
                uplevel #0 $w $o
        }
}
trace add variable current_diff_path write trace_current_diff_path

frame .vpane.lower.diff.header -background gold
label .vpane.lower.diff.header.status \
        -background gold \
        -foreground black \
        -width $max_status_desc \
        -anchor w \
        -justify left
label .vpane.lower.diff.header.file \
        -background gold \
        -foreground black \
        -anchor w \
        -justify left
label .vpane.lower.diff.header.path \
        -background gold \
        -foreground black \
        -anchor w \
        -justify left
pack .vpane.lower.diff.header.status -side left
pack .vpane.lower.diff.header.file -side left
pack .vpane.lower.diff.header.path -fill x
set ctxm .vpane.lower.diff.header.ctxm
menu $ctxm -tearoff 0
$ctxm add command \
        -label [mc Copy] \
        -command {
                clipboard clear
                clipboard append \
                        -format STRING \
                        -type STRING \
                        -- $current_diff_path
        }
lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
bind_button3 .vpane.lower.diff.header.path "tk_popup $ctxm %X %Y"

# -- Diff Body
#
frame .vpane.lower.diff.body
set ui_diff .vpane.lower.diff.body.t
text $ui_diff -background white -foreground black \
        -borderwidth 0 \
        -width 80 -height 15 -wrap none \
        -font font_diff \
        -xscrollcommand {.vpane.lower.diff.body.sbx set} \
        -yscrollcommand {.vpane.lower.diff.body.sby set} \
        -state disabled
scrollbar .vpane.lower.diff.body.sbx -orient horizontal \
        -command [list $ui_diff xview]
scrollbar .vpane.lower.diff.body.sby -orient vertical \
        -command [list $ui_diff yview]
pack .vpane.lower.diff.body.sbx -side bottom -fill x
pack .vpane.lower.diff.body.sby -side right -fill y
pack $ui_diff -side left -fill both -expand 1
pack .vpane.lower.diff.header -side top -fill x
pack .vpane.lower.diff.body -side bottom -fill both -expand 1

$ui_diff tag conf d_cr -elide true
$ui_diff tag conf d_@ -foreground blue -font font_diffbold
$ui_diff tag conf d_+ -foreground {#00a000}
$ui_diff tag conf d_- -foreground red

$ui_diff tag conf d_++ -foreground {#00a000}
$ui_diff tag conf d_-- -foreground red
$ui_diff tag conf d_+s \
        -foreground {#00a000} \
        -background {#e2effa}
$ui_diff tag conf d_-s \
        -foreground red \
        -background {#e2effa}
$ui_diff tag conf d_s+ \
        -foreground {#00a000} \
        -background ivory1
$ui_diff tag conf d_s- \
        -foreground red \
        -background ivory1

$ui_diff tag conf d<<<<<<< \
        -foreground orange \
        -font font_diffbold
$ui_diff tag conf d======= \
        -foreground orange \
        -font font_diffbold
$ui_diff tag conf d>>>>>>> \
        -foreground orange \
        -font font_diffbold

$ui_diff tag raise sel

# -- Diff Body Context Menu
#

proc create_common_diff_popup {ctxm} {
        $ctxm add command \
                -label [mc "Show Less Context"] \
                -command show_less_context
        lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
        $ctxm add command \
                -label [mc "Show More Context"] \
                -command show_more_context
        lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
        $ctxm add separator
        $ctxm add command \
                -label [mc Refresh] \
                -command reshow_diff
        lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
        $ctxm add command \
                -label [mc Copy] \
                -command {tk_textCopy $ui_diff}
        lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
        $ctxm add command \
                -label [mc "Select All"] \
                -command {focus $ui_diff;$ui_diff tag add sel 0.0 end}
        lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
        $ctxm add command \
                -label [mc "Copy All"] \
                -command {
                        $ui_diff tag add sel 0.0 end
                        tk_textCopy $ui_diff
                        $ui_diff tag remove sel 0.0 end
                }
        lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
        $ctxm add separator
        $ctxm add command \
                -label [mc "Decrease Font Size"] \
                -command {incr_font_size font_diff -1}
        lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
        $ctxm add command \
                -label [mc "Increase Font Size"] \
                -command {incr_font_size font_diff 1}
        lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
        $ctxm add separator
        set emenu $ctxm.enc
        menu $emenu
        build_encoding_menu $emenu [list force_diff_encoding]
        $ctxm add cascade \
                -label [mc "Encoding"] \
                -menu $emenu
        lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
        $ctxm add separator
        $ctxm add command -label [mc "Options..."] \
                -command do_options
}

set ctxm .vpane.lower.diff.body.ctxm
menu $ctxm -tearoff 0
$ctxm add command \
        -label [mc "Apply/Reverse Hunk"] \
        -command {apply_hunk $cursorX $cursorY}
set ui_diff_applyhunk [$ctxm index last]
lappend diff_actions [list $ctxm entryconf $ui_diff_applyhunk -state]
$ctxm add command \
        -label [mc "Apply/Reverse Line"] \
        -command {apply_line $cursorX $cursorY; do_rescan}
set ui_diff_applyline [$ctxm index last]
lappend diff_actions [list $ctxm entryconf $ui_diff_applyline -state]
$ctxm add separator
create_common_diff_popup $ctxm

set ctxmmg .vpane.lower.diff.body.ctxmmg
menu $ctxmmg -tearoff 0
$ctxmmg add command \
        -label [mc "Run Merge Tool"] \
        -command {merge_resolve_tool}
lappend diff_actions [list $ctxmmg entryconf [$ctxmmg index last] -state]
$ctxmmg add separator
$ctxmmg add command \
        -label [mc "Use Remote Version"] \
        -command {merge_resolve_one 3}
lappend diff_actions [list $ctxmmg entryconf [$ctxmmg index last] -state]
$ctxmmg add command \
        -label [mc "Use Local Version"] \
        -command {merge_resolve_one 2}
lappend diff_actions [list $ctxmmg entryconf [$ctxmmg index last] -state]
$ctxmmg add command \
        -label [mc "Revert To Base"] \
        -command {merge_resolve_one 1}
lappend diff_actions [list $ctxmmg entryconf [$ctxmmg index last] -state]
$ctxmmg add separator
create_common_diff_popup $ctxmmg

proc popup_diff_menu {ctxm ctxmmg x y X Y} {
        global current_diff_path file_states
        set ::cursorX $x
        set ::cursorY $y
        if {[info exists file_states($current_diff_path)]} {
                set state [lindex $file_states($current_diff_path) 0]
        } else {
                set state {__}
        }
        if {[string first {U} $state] >= 0} {
                tk_popup $ctxmmg $X $Y
        } else {
                if {$::ui_index eq $::current_diff_side} {
                        set l [mc "Unstage Hunk From Commit"]
                        set t [mc "Unstage Line From Commit"]
                } else {
                        set l [mc "Stage Hunk For Commit"]
                        set t [mc "Stage Line For Commit"]
                }
                if {$::is_3way_diff
                        || $current_diff_path eq {}
                        || {__} eq $state
                        || {_O} eq $state
                        || {_T} eq $state
                        || {T_} eq $state} {
                        set s disabled
                } else {
                        set s normal
                }
                $ctxm entryconf $::ui_diff_applyhunk -state $s -label $l
                $ctxm entryconf $::ui_diff_applyline -state $s -label $t
                tk_popup $ctxm $X $Y
        }
}
bind_button3 $ui_diff [list popup_diff_menu $ctxm $ctxmmg %x %y %X %Y]

# -- Status Bar
#
set main_status [::status_bar::new .status]
pack .status -anchor w -side bottom -fill x
$main_status show [mc "Initializing..."]

# -- Load geometry
#
catch {
set gm $repo_config(gui.geometry)
wm geometry . [lindex $gm 0]
.vpane sash place 0 \
        [lindex $gm 1] \
        [lindex [.vpane sash coord 0] 1]
.vpane.files sash place 0 \
        [lindex [.vpane.files sash coord 0] 0] \
        [lindex $gm 2]
unset gm
}

# -- Key Bindings
#
bind $ui_comm <$M1B-Key-Return> {do_commit;break}
bind $ui_comm <$M1B-Key-t> {do_add_selection;break}
bind $ui_comm <$M1B-Key-T> {do_add_selection;break}
bind $ui_comm <$M1B-Key-i> {do_add_all;break}
bind $ui_comm <$M1B-Key-I> {do_add_all;break}
bind $ui_comm <$M1B-Key-x> {tk_textCut %W;break}
bind $ui_comm <$M1B-Key-X> {tk_textCut %W;break}
bind $ui_comm <$M1B-Key-c> {tk_textCopy %W;break}
bind $ui_comm <$M1B-Key-C> {tk_textCopy %W;break}
bind $ui_comm <$M1B-Key-v> {tk_textPaste %W; %W see insert; break}
bind $ui_comm <$M1B-Key-V> {tk_textPaste %W; %W see insert; break}
bind $ui_comm <$M1B-Key-a> {%W tag add sel 0.0 end;break}
bind $ui_comm <$M1B-Key-A> {%W tag add sel 0.0 end;break}
bind $ui_comm <$M1B-Key-minus> {show_less_context;break}
bind $ui_comm <$M1B-Key-KP_Subtract> {show_less_context;break}
bind $ui_comm <$M1B-Key-equal> {show_more_context;break}
bind $ui_comm <$M1B-Key-plus> {show_more_context;break}
bind $ui_comm <$M1B-Key-KP_Add> {show_more_context;break}

bind $ui_diff <$M1B-Key-x> {tk_textCopy %W;break}
bind $ui_diff <$M1B-Key-X> {tk_textCopy %W;break}
bind $ui_diff <$M1B-Key-c> {tk_textCopy %W;break}
bind $ui_diff <$M1B-Key-C> {tk_textCopy %W;break}
bind $ui_diff <$M1B-Key-v> {break}
bind $ui_diff <$M1B-Key-V> {break}
bind $ui_diff <$M1B-Key-a> {%W tag add sel 0.0 end;break}
bind $ui_diff <$M1B-Key-A> {%W tag add sel 0.0 end;break}
bind $ui_diff <Key-Up>     {catch {%W yview scroll -1 units};break}
bind $ui_diff <Key-Down>   {catch {%W yview scroll  1 units};break}
bind $ui_diff <Key-Left>   {catch {%W xview scroll -1 units};break}
bind $ui_diff <Key-Right>  {catch {%W xview scroll  1 units};break}
bind $ui_diff <Key-k>         {catch {%W yview scroll -1 units};break}
bind $ui_diff <Key-j>         {catch {%W yview scroll  1 units};break}
bind $ui_diff <Key-h>         {catch {%W xview scroll -1 units};break}
bind $ui_diff <Key-l>         {catch {%W xview scroll  1 units};break}
bind $ui_diff <Control-Key-b> {catch {%W yview scroll -1 pages};break}
bind $ui_diff <Control-Key-f> {catch {%W yview scroll  1 pages};break}
bind $ui_diff <Button-1>   {focus %W}

if {[is_enabled branch]} {
        bind . <$M1B-Key-n> branch_create::dialog
        bind . <$M1B-Key-N> branch_create::dialog
        bind . <$M1B-Key-o> branch_checkout::dialog
        bind . <$M1B-Key-O> branch_checkout::dialog
        bind . <$M1B-Key-m> merge::dialog
        bind . <$M1B-Key-M> merge::dialog
}
if {[is_enabled transport]} {
        bind . <$M1B-Key-p> do_push_anywhere
        bind . <$M1B-Key-P> do_push_anywhere
}

bind .   <Key-F5>     ui_do_rescan
bind .   <$M1B-Key-r> ui_do_rescan
bind .   <$M1B-Key-R> ui_do_rescan
bind .   <$M1B-Key-s> do_signoff
bind .   <$M1B-Key-S> do_signoff
bind .   <$M1B-Key-t> do_add_selection
bind .   <$M1B-Key-T> do_add_selection
bind .   <$M1B-Key-i> do_add_all
bind .   <$M1B-Key-I> do_add_all
bind .   <$M1B-Key-minus> {show_less_context;break}
bind .   <$M1B-Key-KP_Subtract> {show_less_context;break}
bind .   <$M1B-Key-equal> {show_more_context;break}
bind .   <$M1B-Key-plus> {show_more_context;break}
bind .   <$M1B-Key-KP_Add> {show_more_context;break}
bind .   <$M1B-Key-Return> do_commit
foreach i [list $ui_index $ui_workdir] {
        bind $i <Button-1>       "toggle_or_diff         $i %x %y; break"
        bind $i <$M1B-Button-1>  "add_one_to_selection   $i %x %y; break"
        bind $i <Shift-Button-1> "add_range_to_selection $i %x %y; break"
}
unset i

set file_lists($ui_index) [list]
set file_lists($ui_workdir) [list]

wm title . "[appname] ([reponame]) [file normalize [file dirname [gitdir]]]"
focus -force $ui_comm

# -- Warn the user about environmental problems.  Cygwin's Tcl
#    does *not* pass its env array onto any processes it spawns.
#    This means that git processes get none of our environment.
#
if {[is_Cygwin]} {
        set ignored_env 0
        set suggest_user {}
        set msg [mc "Possible environment issues exist.

The following environment variables are probably
going to be ignored by any Git subprocess run
by %s:

" [appname]]
        foreach name [array names env] {
                switch -regexp -- $name {
                {^GIT_INDEX_FILE$} -
                {^GIT_OBJECT_DIRECTORY$} -
                {^GIT_ALTERNATE_OBJECT_DIRECTORIES$} -
                {^GIT_DIFF_OPTS$} -
                {^GIT_EXTERNAL_DIFF$} -
                {^GIT_PAGER$} -
                {^GIT_TRACE$} -
                {^GIT_CONFIG$} -
                {^GIT_CONFIG_LOCAL$} -
                {^GIT_(AUTHOR|COMMITTER)_DATE$} {
                        append msg " - $name\n"
                        incr ignored_env
                }
                {^GIT_(AUTHOR|COMMITTER)_(NAME|EMAIL)$} {
                        append msg " - $name\n"
                        incr ignored_env
                        set suggest_user $name
                }
                }
        }
        if {$ignored_env > 0} {
                append msg [mc "
This is due to a known issue with the
Tcl binary distributed by Cygwin."]

                if {$suggest_user ne {}} {
                        append msg [mc "

A good replacement for %s
is placing values for the user.name and
user.email settings into your personal
~/.gitconfig file.
" $suggest_user]
                }
                warn_popup $msg
        }
        unset ignored_env msg suggest_user name
}

# -- Only initialize complex UI if we are going to stay running.
#
if {[is_enabled transport]} {
        load_all_remotes

        set n [.mbar.remote index end]
        populate_remotes_menu
        set n [expr {[.mbar.remote index end] - $n}]
        if {$n > 0} {
                if {[.mbar.remote type 0] eq "tearoff"} { incr n }
                .mbar.remote insert $n separator
        }
        unset n
}

if {[winfo exists $ui_comm]} {
        set GITGUI_BCK_exists [load_message GITGUI_BCK]

        # -- If both our backup and message files exist use the
        #    newer of the two files to initialize the buffer.
        #
        if {$GITGUI_BCK_exists} {
                set m [gitdir GITGUI_MSG]
                if {[file isfile $m]} {
                        if {[file mtime [gitdir GITGUI_BCK]] > [file mtime $m]} {
                                catch {file delete [gitdir GITGUI_MSG]}
                        } else {
                                $ui_comm delete 0.0 end
                                $ui_comm edit reset
                                $ui_comm edit modified false
                                catch {file delete [gitdir GITGUI_BCK]}
                                set GITGUI_BCK_exists 0
                        }
                }
                unset m
        }

        proc backup_commit_buffer {} {
                global ui_comm GITGUI_BCK_exists

                set m [$ui_comm edit modified]
                if {$m || $GITGUI_BCK_exists} {
                        set msg [string trim [$ui_comm get 0.0 end]]
                        regsub -all -line {[ \r\t]+$} $msg {} msg

                        if {$msg eq {}} {
                                if {$GITGUI_BCK_exists} {
                                        catch {file delete [gitdir GITGUI_BCK]}
                                        set GITGUI_BCK_exists 0
                                }
                        } elseif {$m} {
                                catch {
                                        set fd [open [gitdir GITGUI_BCK] w]
                                        puts -nonewline $fd $msg
                                        close $fd
                                        set GITGUI_BCK_exists 1
                                }
                        }

                        $ui_comm edit modified false
                }

                set ::GITGUI_BCK_i [after 2000 backup_commit_buffer]
        }

        backup_commit_buffer

        # -- If the user has aspell available we can drive it
        #    in pipe mode to spellcheck the commit message.
        #
        set spell_cmd [list |]
        set spell_dict [get_config gui.spellingdictionary]
        lappend spell_cmd aspell
        if {$spell_dict ne {}} {
                lappend spell_cmd --master=$spell_dict
        }
        lappend spell_cmd --mode=none
        lappend spell_cmd --encoding=utf-8
        lappend spell_cmd pipe
        if {$spell_dict eq {none}
         || [catch {set spell_fd [open $spell_cmd r+]} spell_err]} {
                bind_button3 $ui_comm [list tk_popup $ui_comm_ctxm %X %Y]
        } else {
                set ui_comm_spell [spellcheck::init \
                        $spell_fd \
                        $ui_comm \
                        $ui_comm_ctxm \
                ]
        }
        unset -nocomplain spell_cmd spell_fd spell_err spell_dict
}

lock_index begin-read
if {![winfo ismapped .]} {
        wm deiconify .
}
after 1 {
        if {[is_enabled initialamend]} {
                force_amend
        } else {
                do_rescan
        }

        if {[is_enabled nocommitmsg]} {
                $ui_comm configure -state disabled -background gray
        }
}
if {[is_enabled multicommit]} {
        after 1000 hint_gc
}
if {[is_enabled retcode]} {
        bind . <Destroy> {+terminate_me %W}
}
if {$picked && [is_config_true gui.autoexplore]} {
        do_explore
}