# git-gui tree browser
# Copyright (C) 2006, 2007 Shawn Pearce

class browser {

field w
field browser_commit
field browser_path
field browser_files  {}
field browser_status {Starting...}
field browser_stack  {}
field browser_busy   1

field ls_buf     {}; # Buffered record output from ls-tree

constructor new {commit} {
        global cursor_ptr M1B
        make_toplevel top w
        wm title $top "[appname] ([reponame]): File Browser"

        set browser_commit $commit
        set browser_path $browser_commit:

        label $w.path \
                -textvariable @browser_path \
                -anchor w \
                -justify left \
                -borderwidth 1 \
                -relief sunken \
                -font font_uibold
        pack $w.path -anchor w -side top -fill x

        frame $w.list
        set w_list $w.list.l
        text $w_list -background white -borderwidth 0 \
                -cursor $cursor_ptr \
                -state disabled \
                -wrap none \
                -height 20 \
                -width 70 \
                -xscrollcommand [list $w.list.sbx set] \
                -yscrollcommand [list $w.list.sby set]
        $w_list tag conf in_sel \
                -background [$w_list cget -foreground] \
                -foreground [$w_list cget -background]
        scrollbar $w.list.sbx -orient h -command [list $w_list xview]
        scrollbar $w.list.sby -orient v -command [list $w_list yview]
        pack $w.list.sbx -side bottom -fill x
        pack $w.list.sby -side right -fill y
        pack $w_list -side left -fill both -expand 1
        pack $w.list -side top -fill both -expand 1

        label $w.status \
                -textvariable @browser_status \
                -anchor w \
                -justify left \
                -borderwidth 1 \
                -relief sunken
        pack $w.status -anchor w -side bottom -fill x

        bind $w_list <Button-1>        "[cb _click 0 @%x,%y];break"
        bind $w_list <Double-Button-1> "[cb _click 1 @%x,%y];break"
        bind $w_list <$M1B-Up>         "[cb _parent]        ;break"
        bind $w_list <$M1B-Left>       "[cb _parent]        ;break"
        bind $w_list <Up>              "[cb _move -1]       ;break"
        bind $w_list <Down>            "[cb _move  1]       ;break"
        bind $w_list <$M1B-Right>      "[cb _enter]         ;break"
        bind $w_list <Return>          "[cb _enter]         ;break"
        bind $w_list <Prior>           "[cb _page -1]       ;break"
        bind $w_list <Next>            "[cb _page  1]       ;break"
        bind $w_list <Left>            break
        bind $w_list <Right>           break

        bind $w_list <Visibility> [list focus $w_list]
        set w $w_list
        _ls $this $browser_commit
        return $this
}

method _move {dir} {
        if {$browser_busy} return
        set lno [lindex [split [$w index in_sel.first] .] 0]
        incr lno $dir
        if {[lindex $browser_files [expr {$lno - 1}]] ne {}} {
                $w tag remove in_sel 0.0 end
                $w tag add in_sel $lno.0 [expr {$lno + 1}].0
                $w see $lno.0
        }
}

method _page {dir} {
        if {$browser_busy} return
        $w yview scroll $dir pages
        set lno [expr {int(
                  [lindex [$w yview] 0]
                * [llength $browser_files]
                + 1)}]
        if {[lindex $browser_files [expr {$lno - 1}]] ne {}} {
                $w tag remove in_sel 0.0 end
                $w tag add in_sel $lno.0 [expr {$lno + 1}].0
                $w see $lno.0
        }
}

method _parent {} {
        if {$browser_busy} return
        set info [lindex $browser_files 0]
        if {[lindex $info 0] eq {parent}} {
                set parent [lindex $browser_stack end-1]
                set browser_stack [lrange $browser_stack 0 end-2]
                if {$browser_stack eq {}} {
                        regsub {:.*$} $browser_path {:} browser_path
                } else {
                        regsub {/[^/]+$} $browser_path {} browser_path
                }
                set browser_status "Loading $browser_path..."
                _ls $this [lindex $parent 0] [lindex $parent 1]
        }
}

method _enter {} {
        if {$browser_busy} return
        set lno [lindex [split [$w index in_sel.first] .] 0]
        set info [lindex $browser_files [expr {$lno - 1}]]
        if {$info ne {}} {
                switch -- [lindex $info 0] {
                parent {
                        _parent $this
                }
                tree {
                        set name [lindex $info 2]
                        set escn [escape_path $name]
                        set browser_status "Loading $escn..."
                        append browser_path $escn
                        _ls $this [lindex $info 1] $name
                }
                blob {
                        set name [lindex $info 2]
                        set p {}
                        foreach n $browser_stack {
                                append p [lindex $n 1]
                        }
                        append p $name
                        blame::new $browser_commit $p
                }
                }
        }
}

method _click {was_double_click pos} {
        if {$browser_busy} return
        set lno [lindex [split [$w index $pos] .] 0]
        focus $w

        if {[lindex $browser_files [expr {$lno - 1}]] ne {}} {
                $w tag remove in_sel 0.0 end
                $w tag add in_sel $lno.0 [expr {$lno + 1}].0
                if {$was_double_click} {
                        _enter $this
                }
        }
}

method _ls {tree_id {name {}}} {
        set ls_buf {}
        set browser_files {}
        set browser_busy 1

        $w conf -state normal
        $w tag remove in_sel 0.0 end
        $w delete 0.0 end
        if {$browser_stack ne {}} {
                $w image create end \
                        -align center -padx 5 -pady 1 \
                        -name icon0 \
                        -image file_uplevel
                $w insert end {[Up To Parent]}
                lappend browser_files parent
        }
        lappend browser_stack [list $tree_id $name]
        $w conf -state disabled

        set cmd [list git ls-tree -z $tree_id]
        set fd [open "| $cmd" r]
        fconfigure $fd -blocking 0 -translation binary -encoding binary
        fileevent $fd readable [cb _read $fd]
}

method _read {fd} {
        append ls_buf [read $fd]
        set pck [split $ls_buf "\0"]
        set ls_buf [lindex $pck end]

        set n [llength $browser_files]
        $w conf -state normal
        foreach p [lrange $pck 0 end-1] {
                set tab [string first "\t" $p]
                if {$tab == -1} continue

                set info [split [string range $p 0 [expr {$tab - 1}]] { }]
                set path [string range $p [expr {$tab + 1}] end]
                set type   [lindex $info 1]
                set object [lindex $info 2]

                switch -- $type {
                blob {
                        set image file_mod
                }
                tree {
                        set image file_dir
                        append path /
                }
                default {
                        set image file_question
                }
                }

                if {$n > 0} {$w insert end "\n"}
                $w image create end \
                        -align center -padx 5 -pady 1 \
                        -name icon[incr n] \
                        -image $image
                $w insert end [escape_path $path]
                lappend browser_files [list $type $object $path]
        }
        $w conf -state disabled

        if {[eof $fd]} {
                close $fd
                set browser_status Ready.
                set browser_busy 0
                set ls_buf {}
                if {$n > 0} {
                        $w tag add in_sel 1.0 2.0
                        focus -force $w
                }
        }
} ifdeleted {
        catch {close $fd}
}

}