# git-gui branch (create/delete) support
# Copyright (C) 2006, 2007 Shawn Pearce

proc load_all_heads {} {
        global all_heads

        set all_heads [list]
        set fd [open "| git for-each-ref --format=%(refname) refs/heads" r]
        while {[gets $fd line] > 0} {
                if {[is_tracking_branch $line]} continue
                if {![regsub ^refs/heads/ $line {} name]} continue
                lappend all_heads $name
        }
        close $fd

        set all_heads [lsort $all_heads]
}

proc load_all_tags {} {
        set all_tags [list]
        set fd [open "| git for-each-ref --format=%(refname) refs/tags" r]
        while {[gets $fd line] > 0} {
                if {![regsub ^refs/tags/ $line {} name]} continue
                lappend all_tags $name
        }
        close $fd

        return [lsort $all_tags]
}

proc populate_branch_menu {} {
        global all_heads disable_on_lock

        set m .mbar.branch
        set last [$m index last]
        for {set i 0} {$i <= $last} {incr i} {
                if {[$m type $i] eq {separator}} {
                        $m delete $i last
                        set new_dol [list]
                        foreach a $disable_on_lock {
                                if {[lindex $a 0] ne $m || [lindex $a 2] < $i} {
                                        lappend new_dol $a
                                }
                        }
                        set disable_on_lock $new_dol
                        break
                }
        }

        if {$all_heads ne {}} {
                $m add separator
        }
        foreach b $all_heads {
                $m add radiobutton \
                        -label $b \
                        -command [list switch_branch $b] \
                        -variable current_branch \
                        -value $b
                lappend disable_on_lock \
                        [list $m entryconf [$m index last] -state]
        }
}

proc radio_selector {varname value args} {
        upvar #0 $varname var
        set var $value
}

proc do_delete_branch_action {w} {
        global all_heads
        global delete_branch_checktype delete_branch_head delete_branch_trackinghead

        set check_rev {}
        switch -- $delete_branch_checktype {
        head {set check_rev $delete_branch_head}
        tracking {set check_rev $delete_branch_trackinghead}
        always {set check_rev {:none}}
        }
        if {$check_rev eq {:none}} {
                set check_cmt {}
        } elseif {[catch {set check_cmt [git rev-parse --verify "${check_rev}^0"]}]} {
                tk_messageBox \
                        -icon error \
                        -type ok \
                        -title [wm title $w] \
                        -parent $w \
                        -message "Invalid check revision: $check_rev"
                return
        }

        set to_delete [list]
        set not_merged [list]
        foreach i [$w.list.l curselection] {
                set b [$w.list.l get $i]
                if {[catch {set o [git rev-parse --verify $b]}]} continue
                if {$check_cmt ne {}} {
                        if {$b eq $check_rev} continue
                        if {[catch {set m [git merge-base $o $check_cmt]}]} continue
                        if {$o ne $m} {
                                lappend not_merged $b
                                continue
                        }
                }
                lappend to_delete [list $b $o]
        }
        if {$not_merged ne {}} {
                set msg "The following branches are not completely merged into $check_rev:

 - [join $not_merged "\n - "]"
                tk_messageBox \
                        -icon info \
                        -type ok \
                        -title [wm title $w] \
                        -parent $w \
                        -message $msg
        }
        if {$to_delete eq {}} return
        if {$delete_branch_checktype eq {always}} {
                set msg {Recovering deleted branches is difficult.

Delete the selected branches?}
                if {[tk_messageBox \
                        -icon warning \
                        -type yesno \
                        -title [wm title $w] \
                        -parent $w \
                        -message $msg] ne yes} {
                        return
                }
        }

        set failed {}
        foreach i $to_delete {
                set b [lindex $i 0]
                set o [lindex $i 1]
                if {[catch {git update-ref -d "refs/heads/$b" $o} err]} {
                        append failed " - $b: $err\n"
                } else {
                        set x [lsearch -sorted -exact $all_heads $b]
                        if {$x >= 0} {
                                set all_heads [lreplace $all_heads $x $x]
                        }
                }
        }

        if {$failed ne {}} {
                tk_messageBox \
                        -icon error \
                        -type ok \
                        -title [wm title $w] \
                        -parent $w \
                        -message "Failed to delete branches:\n$failed"
        }

        set all_heads [lsort $all_heads]
        populate_branch_menu
        destroy $w
}

proc do_delete_branch {} {
        global all_heads tracking_branches current_branch
        global delete_branch_checktype delete_branch_head delete_branch_trackinghead

        set w .branch_editor
        toplevel $w
        wm geometry $w "+[winfo rootx .]+[winfo rooty .]"

        label $w.header -text {Delete Local Branch} \
                -font font_uibold
        pack $w.header -side top -fill x

        frame $w.buttons
        button $w.buttons.create -text Delete \
                -command [list do_delete_branch_action $w]
        pack $w.buttons.create -side right
        button $w.buttons.cancel -text {Cancel} \
                -command [list destroy $w]
        pack $w.buttons.cancel -side right -padx 5
        pack $w.buttons -side bottom -fill x -pady 10 -padx 10

        labelframe $w.list -text {Local Branches}
        listbox $w.list.l \
                -height 10 \
                -width 70 \
                -selectmode extended \
                -yscrollcommand [list $w.list.sby set]
        foreach h $all_heads {
                if {$h ne $current_branch} {
                        $w.list.l insert end $h
                }
        }
        scrollbar $w.list.sby -command [list $w.list.l yview]
        pack $w.list.sby -side right -fill y
        pack $w.list.l -side left -fill both -expand 1
        pack $w.list -fill both -expand 1 -pady 5 -padx 5

        labelframe $w.validate -text {Delete Only If}
        radiobutton $w.validate.head_r \
                -text {Merged Into Local Branch:} \
                -value head \
                -variable delete_branch_checktype
        eval tk_optionMenu $w.validate.head_m delete_branch_head $all_heads
        grid $w.validate.head_r $w.validate.head_m -sticky w
        set all_trackings [all_tracking_branches]
        if {$all_trackings ne {}} {
                set delete_branch_trackinghead [lindex $all_trackings 0]
                radiobutton $w.validate.tracking_r \
                        -text {Merged Into Tracking Branch:} \
                        -value tracking \
                        -variable delete_branch_checktype
                eval tk_optionMenu $w.validate.tracking_m \
                        delete_branch_trackinghead \
                        $all_trackings
                grid $w.validate.tracking_r $w.validate.tracking_m -sticky w
        }
        radiobutton $w.validate.always_r \
                -text {Always (Do not perform merge checks)} \
                -value always \
                -variable delete_branch_checktype
        grid $w.validate.always_r -columnspan 2 -sticky w
        grid columnconfigure $w.validate 1 -weight 1
        pack $w.validate -anchor nw -fill x -pady 5 -padx 5

        set delete_branch_head $current_branch
        set delete_branch_checktype head

        bind $w <Visibility> "grab $w; focus $w"
        bind $w <Key-Escape> "destroy $w"
        wm title $w "[appname] ([reponame]): Delete Branch"
        tkwait window $w
}

proc switch_branch {new_branch} {
        global HEAD commit_type current_branch repo_config

        if {![lock_index switch]} return

        # -- Our in memory state should match the repository.
        #
        repository_state curType curHEAD curMERGE_HEAD
        if {[string match amend* $commit_type]
                && $curType eq {normal}
                && $curHEAD eq $HEAD} {
        } elseif {$commit_type ne $curType || $HEAD ne $curHEAD} {
                info_popup {Last scanned state does not match repository state.

Another Git program has modified this repository since the last scan.  A rescan must be performed before the current branch can be changed.

The rescan will be automatically started now.
}
                unlock_index
                rescan {set ui_status_value {Ready.}}
                return
        }

        # -- Don't do a pointless switch.
        #
        if {$current_branch eq $new_branch} {
                unlock_index
                return
        }

        if {$repo_config(gui.trustmtime) eq {true}} {
                switch_branch_stage2 {} $new_branch
        } else {
                set ui_status_value {Refreshing file status...}
                set cmd [list git update-index]
                lappend cmd -q
                lappend cmd --unmerged
                lappend cmd --ignore-missing
                lappend cmd --refresh
                set fd_rf [open "| $cmd" r]
                fconfigure $fd_rf -blocking 0 -translation binary
                fileevent $fd_rf readable \
                        [list switch_branch_stage2 $fd_rf $new_branch]
        }
}

proc switch_branch_stage2 {fd_rf new_branch} {
        global ui_status_value HEAD

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

        set ui_status_value "Updating working directory to '$new_branch'..."
        set cmd [list git read-tree]
        lappend cmd -m
        lappend cmd -u
        lappend cmd --exclude-per-directory=.gitignore
        lappend cmd $HEAD
        lappend cmd $new_branch
        set fd_rt [open "| $cmd" r]
        fconfigure $fd_rt -blocking 0 -translation binary
        fileevent $fd_rt readable \
                [list switch_branch_readtree_wait $fd_rt $new_branch]
}

proc switch_branch_readtree_wait {fd_rt new_branch} {
        global selected_commit_type commit_type HEAD MERGE_HEAD PARENT
        global current_branch
        global ui_comm ui_status_value

        # -- We never get interesting output on stdout; only stderr.
        #
        read $fd_rt
        fconfigure $fd_rt -blocking 1
        if {![eof $fd_rt]} {
                fconfigure $fd_rt -blocking 0
                return
        }

        # -- The working directory wasn't in sync with the index and
        #    we'd have to overwrite something to make the switch. A
        #    merge is required.
        #
        if {[catch {close $fd_rt} err]} {
                regsub {^fatal: } $err {} err
                warn_popup "File level merge required.

$err

Staying on branch '$current_branch'."
                set ui_status_value "Aborted checkout of '$new_branch' (file level merging is required)."
                unlock_index
                return
        }

        # -- Update the symbolic ref.  Core git doesn't even check for failure
        #    here, it Just Works(tm).  If it doesn't we are in some really ugly
        #    state that is difficult to recover from within git-gui.
        #
        if {[catch {git symbolic-ref HEAD "refs/heads/$new_branch"} err]} {
                error_popup "Failed to set current branch.

This working directory is only partially switched.  We successfully updated your files, but failed to update an internal Git file.

This should not have occurred.  [appname] will now close and give up.

$err"
                do_quit
                return
        }

        # -- Update our repository state.  If we were previously in amend mode
        #    we need to toss the current buffer and do a full rescan to update
        #    our file lists.  If we weren't in amend mode our file lists are
        #    accurate and we can avoid the rescan.
        #
        unlock_index
        set selected_commit_type new
        if {[string match amend* $commit_type]} {
                $ui_comm delete 0.0 end
                $ui_comm edit reset
                $ui_comm edit modified false
                rescan {set ui_status_value "Checked out branch '$current_branch'."}
        } else {
                repository_state commit_type HEAD MERGE_HEAD
                set PARENT $HEAD
                set ui_status_value "Checked out branch '$current_branch'."
        }
}