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path: root/lib/blame.tcl
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# git-gui blame viewer
# Copyright (C) 2006, 2007 Shawn Pearce

class blame {

field commit  ; # input commit to blame
field path    ; # input filename to view in $commit

field w
field w_line
field w_cgrp
field w_load
field w_file
field w_cmit
field status

field highlight_line   -1 ; # current line selected
field highlight_commit {} ; # sha1 of commit selected

field total_lines       0  ; # total length of file
field blame_lines       0  ; # number of lines computed
field commit_count      0  ; # number of commits in $commit_list
field commit_list      {}  ; # list of commit sha1 in receipt order
field order                ; # array commit -> receipt order
field header               ; # array commit,key -> header field
field line_commit          ; # array line -> sha1 commit
field line_file            ; # array line -> file name

field r_commit      ; # commit currently being parsed
field r_orig_line   ; # original line number
field r_final_line  ; # final line number
field r_line_count  ; # lines in this region

variable active_color #98e1a0
variable group_colors {
	#cbcbcb
	#e1e1e1
}

constructor new {i_commit i_path} {
	set commit $i_commit
	set path   $i_path

	make_toplevel top w
	wm title $top "[appname] ([reponame]): File Viewer"
	set status "Loading $commit:$path..."

	label $w.path -text "$commit:$path" \
		-anchor w \
		-justify left \
		-borderwidth 1 \
		-relief sunken \
		-font font_uibold
	pack $w.path -side top -fill x

	frame $w.out
	set w_load $w.out.loaded_t
	text $w_load \
		-background white -borderwidth 0 \
		-state disabled \
		-wrap none \
		-height 40 \
		-width 1 \
		-font font_diff
	$w_load tag conf annotated -background grey

	set w_line $w.out.linenumber_t
	text $w_line \
		-background white -borderwidth 0 \
		-state disabled \
		-wrap none \
		-height 40 \
		-width 5 \
		-font font_diff
	$w_line tag conf linenumber -justify right

	set w_cgrp $w.out.commit_t
	text $w_cgrp \
		-background white -borderwidth 0 \
		-state disabled \
		-wrap none \
		-height 40 \
		-width 4 \
		-font font_diff

	set w_file $w.out.file_t
	text $w_file \
		-background white -borderwidth 0 \
		-state disabled \
		-wrap none \
		-height 40 \
		-width 80 \
		-xscrollcommand [list $w.out.sbx set] \
		-font font_diff

	scrollbar $w.out.sbx -orient h -command [list $w_file xview]
	scrollbar $w.out.sby -orient v \
		-command [list scrollbar2many [list \
		$w_load \
		$w_line \
		$w_cgrp \
		$w_file \
		] yview]
	grid \
		$w_cgrp \
		$w_line \
		$w_load \
		$w_file \
		$w.out.sby \
		-sticky nsew
	grid conf $w.out.sbx -column 3 -sticky we
	grid columnconfigure $w.out 3 -weight 1
	grid rowconfigure $w.out 0 -weight 1
	pack $w.out -fill both -expand 1

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

	frame $w.cm
	set w_cmit $w.cm.t
	text $w_cmit \
		-background white -borderwidth 0 \
		-state disabled \
		-wrap none \
		-height 10 \
		-width 80 \
		-xscrollcommand [list $w.cm.sbx set] \
		-yscrollcommand [list $w.cm.sby set] \
		-font font_diff
	scrollbar $w.cm.sbx -orient h -command [list $w_cmit xview]
	scrollbar $w.cm.sby -orient v -command [list $w_cmit yview]
	pack $w.cm.sby -side right -fill y
	pack $w.cm.sbx -side bottom -fill x
	pack $w_cmit -expand 1 -fill both
	pack $w.cm -side bottom -fill x

	menu $w.ctxm -tearoff 0
	$w.ctxm add command \
		-label "Copy Commit" \
		-command [cb _copycommit]

	foreach i [list \
		$w_cgrp \
		$w_load \
		$w_line \
		$w_file] {
		$i conf -yscrollcommand \
			[list many2scrollbar [list \
			$w_cgrp \
			$w_load \
			$w_line \
			$w_file \
			] yview $w.out.sby]
		bind $i <Button-1> "[cb _click $i @%x,%y]; focus $i"
		bind_button3 $i "
			set cursorX %x
			set cursorY %y
			set cursorW %W
			tk_popup $w.ctxm %X %Y
		"
	}

	foreach i [list \
		$w_cgrp \
		$w_load \
		$w_line \
		$w_file \
		$w_cmit] {
		bind $i <Key-Up>        {catch {%W yview scroll -1 units};break}
		bind $i <Key-Down>      {catch {%W yview scroll  1 units};break}
		bind $i <Key-Left>      {catch {%W xview scroll -1 units};break}
		bind $i <Key-Right>     {catch {%W xview scroll  1 units};break}
		bind $i <Key-k>         {catch {%W yview scroll -1 units};break}
		bind $i <Key-j>         {catch {%W yview scroll  1 units};break}
		bind $i <Key-h>         {catch {%W xview scroll -1 units};break}
		bind $i <Key-l>         {catch {%W xview scroll  1 units};break}
		bind $i <Control-Key-b> {catch {%W yview scroll -1 pages};break}
		bind $i <Control-Key-f> {catch {%W yview scroll  1 pages};break}
	}

	bind $w_cmit <Button-1> [list focus $w_cmit]
	bind $top <Visibility> [list focus $top]
	bind $top <Destroy> [list delete_this $this]

	if {$commit eq {}} {
		set fd [open $path r]
	} else {
		set cmd [list git cat-file blob "$commit:$path"]
		set fd [open "| $cmd" r]
	}
	fconfigure $fd -blocking 0 -translation lf -encoding binary
	fileevent $fd readable [cb _read_file $fd]
}

method _read_file {fd} {
	$w_load conf -state normal
	$w_cgrp conf -state normal
	$w_line conf -state normal
	$w_file conf -state normal
	while {[gets $fd line] >= 0} {
		regsub "\r\$" $line {} line
		incr total_lines

		if {$total_lines > 1} {
			$w_load insert end "\n"
			$w_cgrp insert end "\n"
			$w_line insert end "\n"
			$w_file insert end "\n"
		}

		$w_line insert end "$total_lines" linenumber
		$w_file insert end "$line"
	}
	$w_load conf -state disabled
	$w_cgrp conf -state disabled
	$w_line conf -state disabled
	$w_file conf -state disabled

	if {[eof $fd]} {
		close $fd
		_status $this
		set cmd [list git blame -M -C --incremental]
		if {$commit eq {}} {
			lappend cmd --contents $path
		} else {
			lappend cmd $commit
		}
		lappend cmd -- $path
		set fd [open "| $cmd" r]
		fconfigure $fd -blocking 0 -translation lf -encoding binary
		fileevent $fd readable [cb _read_blame $fd]
	}
} ifdeleted { catch {close $fd} }

method _read_blame {fd} {
	variable group_colors

	$w_cgrp conf -state normal
	while {[gets $fd line] >= 0} {
		if {[regexp {^([a-z0-9]{40}) (\d+) (\d+) (\d+)$} $line line \
			cmit original_line final_line line_count]} {