[thirdparty/git.git] / gitk

#!/bin/sh
# Tcl ignores the next line -*- tcl -*- \
exec wish "$0" -- "$@"

# Copyright (C) 2005 Paul Mackerras.  All rights reserved.
# This program is free software; it may be used, copied, modified
# and distributed under the terms of the GNU General Public Licence,
# either version 2, or (at your option) any later version.

proc gitdir {} {
    global env
    if {[info exists env(GIT_DIR)]} {
	return $env(GIT_DIR)
    } else {
	return ".git"
    }
}

proc parse_args {rargs} {
    global parsed_args

    if [catch {
	set parse_args [concat --default HEAD $rargs]
	set parsed_args [split [eval exec git-rev-parse $parse_args] "\n"]
    }] {
	# if git-rev-parse failed for some reason...
	if {$rargs == {}} {
	    set rargs HEAD
	}
	set parsed_args $rargs
    }
    return $parsed_args
}

proc start_rev_list {rlargs} {
    global startmsecs nextupdate ncmupdate
    global commfd leftover tclencoding

    set startmsecs [clock clicks -milliseconds]
    set nextupdate [expr {$startmsecs + 100}]
    set ncmupdate 1
    if [catch {
	set commfd [open [concat | git-rev-list --header --topo-order \
			      --parents $rlargs] r]
    } err] {
	puts stderr "Error executing git-rev-list: $err"
	exit 1
    }
    set leftover {}
    fconfigure $commfd -blocking 0 -translation lf
    if {$tclencoding != {}} {
	fconfigure $commfd -encoding $tclencoding
    }
    fileevent $commfd readable [list getcommitlines $commfd]
    . config -cursor watch
    settextcursor watch
}

proc getcommits {rargs} {
    global oldcommits commits phase canv mainfont env

    # check that we can find a .git directory somewhere...
    set gitdir [gitdir]
    if {![file isdirectory $gitdir]} {
	error_popup "Cannot find the git directory \"$gitdir\"."
	exit 1
    }
    set oldcommits {}
    set commits {}
    set phase getcommits
    start_rev_list [parse_args $rargs]
    $canv delete all
    $canv create text 3 3 -anchor nw -text "Reading commits..." \
	-font $mainfont -tags textitems
}

proc getcommitlines {commfd}  {
    global oldcommits commits parents cdate children nchildren
    global commitlisted phase nextupdate
    global stopped redisplaying leftover
    global canv

    set stuff [read $commfd]
    if {$stuff == {}} {
	if {![eof $commfd]} return
	# set it blocking so we wait for the process to terminate
	fconfigure $commfd -blocking 1
	if {![catch {close $commfd} err]} {
	    after idle finishcommits
	    return
	}
	if {[string range $err 0 4] == "usage"} {
	    set err \
		"Gitk: error reading commits: bad arguments to git-rev-list.\
		(Note: arguments to gitk are passed to git-rev-list\
		to allow selection of commits to be displayed.)"
	} else {
	    set err "Error reading commits: $err"
	}
	error_popup $err
	exit 1
    }
    set start 0
    while 1 {
	set i [string first "\0" $stuff $start]
	if {$i < 0} {
	    append leftover [string range $stuff $start end]
	    return
	}
	set cmit [string range $stuff $start [expr {$i - 1}]]
	if {$start == 0} {
	    set cmit "$leftover$cmit"
	    set leftover {}
	}
	set start [expr {$i + 1}]
	set j [string first "\n" $cmit]
	set ok 0
	if {$j >= 0} {
	    set ids [string range $cmit 0 [expr {$j - 1}]]
	    set ok 1
	    foreach id $ids {
		if {![regexp {^[0-9a-f]{40}$} $id]} {
		    set ok 0
		    break
		}
	    }
	}
	if {!$ok} {
	    set shortcmit $cmit
	    if {[string length $shortcmit] > 80} {
		set shortcmit "[string range $shortcmit 0 80]..."
	    }
	    error_popup "Can't parse git-rev-list output: {$shortcmit}"
	    exit 1
	}
	set id [lindex $ids 0]
	set olds [lrange $ids 1 end]
	set cmit [string range $cmit [expr {$j + 1}] end]
	lappend commits $id
	set commitlisted($id) 1
	parsecommit $id $cmit 1 [lrange $ids 1 end]
	drawcommit $id 1
	if {[clock clicks -milliseconds] >= $nextupdate} {
	    doupdate 1
	}
	while {$redisplaying} {
	    set redisplaying 0
	    if {$stopped == 1} {
		set stopped 0
		set phase "getcommits"
		foreach id $commits {
		    drawcommit $id 1
		    if {$stopped} break
		    if {[clock clicks -milliseconds] >= $nextupdate} {
			doupdate 1
		    }
		}
	    }
	}
    }
}

proc doupdate {reading} {
    global commfd nextupdate numcommits ncmupdate

    if {$reading} {
	fileevent $commfd readable {}
    }
    update
    set nextupdate [expr {[clock clicks -milliseconds] + 100}]
    if {$numcommits < 100} {
	set ncmupdate [expr {$numcommits + 1}]
    } elseif {$numcommits < 10000} {
	set ncmupdate [expr {$numcommits + 10}]
    } else {
	set ncmupdate [expr {$numcommits + 100}]
    }
    if {$reading} {
	fileevent $commfd readable [list getcommitlines $commfd]
    }
}

proc readcommit {id} {
    if [catch {set contents [exec git-cat-file commit $id]}] return
    parsecommit $id $contents 0 {}
}

proc updatecommits {rargs} {
    global commitlisted commfd phase
    global startmsecs nextupdate ncmupdate
    global idtags idheads idotherrefs
    global leftover
    global parsed_args
    global canv mainfont
    global oldcommits commits
    global parents nchildren children ncleft

    set old_args $parsed_args
    parse_args $rargs

    if {$phase == "getcommits" || $phase == "incrdraw"} {
	# havent read all the old commits, just start again from scratch
	stopfindproc
	set oldcommits {}
	set commits {}
	foreach v {children nchildren parents commitlisted commitinfo
		   selectedline matchinglines treediffs
		   mergefilelist currentid rowtextx} {
	    global $v
	    catch {unset $v}
	}
	readrefs
	if {$phase == "incrdraw"} {
	    allcanvs delete all
	    $canv create text 3 3 -anchor nw -text "Reading commits..." \
		-font $mainfont -tags textitems
	    set phase getcommits
	}
	start_rev_list $parsed_args
	return
    }

    foreach id $old_args {
	if {![regexp {^[0-9a-f]{40}$} $id]} continue
	if {[info exists oldref($id)]} continue
	set oldref($id) $id
	lappend ignoreold "^$id"
    }
    foreach id $parsed_args {
	if {![regexp {^[0-9a-f]{40}$} $id]} continue
	if {[info exists ref($id)]} continue
	set ref($id) $id
	lappend ignorenew "^$id"
    }

    foreach a $old_args {
	if {![info exists ref($a)]} {
	    lappend ignorenew $a
	}
    }

    set phase updatecommits
    set oldcommits $commits
    set commits {}
    set removed_commits [split [eval exec git-rev-list $ignorenew] "\n" ]
    if {[llength $removed_commits] > 0} {
	allcanvs delete all
	foreach c $removed_commits {
	    set i [lsearch -exact $oldcommits $c]
	    if {$i >= 0} {
		set oldcommits [lreplace $oldcommits $i $i]
		unset commitlisted($c)
		foreach p $parents($c) {
		    if {[info exists nchildren($p)]} {
			set j [lsearch -exact $children($p) $c]
			if {$j >= 0} {
			    set children($p) [lreplace $children($p) $j $j]
			    incr nchildren($p) -1
			}
		    }
		}
	    }
	}
	set phase removecommits
    }

    set args {}
    foreach a $parsed_args {
	if {![info exists oldref($a)]} {
	    lappend args $a
	}
    }

    readrefs
    start_rev_list [concat $ignoreold $args]
}

proc updatechildren {id olds} {
    global children nchildren parents nparents ncleft

    if {![info exists nchildren($id)]} {
	set children($id) {}
	set nchildren($id) 0
	set ncleft($id) 0
    }
    set parents($id) $olds
    set nparents($id) [llength $olds]
    foreach p $olds {
	if {![info exists nchildren($p)]} {
	    set children($p) [list $id]
	    set nchildren($p) 1
	    set ncleft($p) 1
	} elseif {[lsearch -exact $children($p) $id] < 0} {
	    lappend children($p) $id
	    incr nchildren($p)
	    incr ncleft($p)
	}
    }
}

proc parsecommit {id contents listed olds} {
    global commitinfo cdate

    set inhdr 1
    set comment {}
    set headline {}
    set auname {}
    set audate {}
    set comname {}
    set comdate {}
    updatechildren $id $olds
    set hdrend [string first "\n\n" $contents]
    if {$hdrend < 0} {
	# should never happen...
	set hdrend [string length $contents]
    }
    set header [string range $contents 0 [expr {$hdrend - 1}]]
    set comment [string range $contents [expr {$hdrend + 2}] end]
    foreach line [split $header "\n"] {
	set tag [lindex $line 0]
	if {$tag == "author"} {
	    set audate [lindex $line end-1]
	    set auname [lrange $line 1 end-2]
	} elseif {$tag == "committer"} {
	    set comdate [lindex $line end-1]
	    set comname [lrange $line 1 end-2]
	}
    }
    set headline {}
    # take the first line of the comment as the headline
    set i [string first "\n" $comment]
    if {$i >= 0} {
	set headline [string trim [string range $comment 0 $i]]
    } else {
	set headline $comment
    }
    if {!$listed} {
	# git-rev-list indents the comment by 4 spaces;
	# if we got this via git-cat-file, add the indentation
	set newcomment {}
	foreach line [split $comment "\n"] {
	    append newcomment "    "
	    append newcomment $line
	    append newcomment "\n"
	}
	set comment $newcomment
    }
    if {$comdate != {}} {
	set cdate($id) $comdate
    }
    set commitinfo($id) [list $headline $auname $audate \
			     $comname $comdate $comment]
}

proc readrefs {} {
    global tagids idtags headids idheads tagcontents
    global otherrefids idotherrefs

    foreach v {tagids idtags headids idheads otherrefids idotherrefs} {
	catch {unset $v}
    }
    set refd [open [list | git-ls-remote [gitdir]] r]
    while {0 <= [set n [gets $refd line]]} {
	if {![regexp {^([0-9a-f]{40})	refs/([^^]*)$} $line \
	    match id path]} {
	    continue
	}
	if {![regexp {^(tags|heads)/(.*)$} $path match type name]} {
	    set type others
	    set name $path
	}
	if {$type == "tags"} {
	    set tagids($name) $id
	    lappend idtags($id) $name
	    set obj {}
	    set type {}
	    set tag {}
	    catch {
		set commit [exec git-rev-parse "$id^0"]
		if {"$commit" != "$id"} {
		    set tagids($name) $commit
		    lappend idtags($commit) $name
		}
	    }		
	    catch {
	        set tagcontents($name) [exec git-cat-file tag "$id"]
	    }
	} elseif { $type == "heads" } {
	    set headids($name) $id
	    lappend idheads($id) $name
	} else {
	    set otherrefids($name) $id
	    lappend idotherrefs($id) $name
	}
    }
    close $refd
}

proc error_popup msg {
    set w .error
    toplevel $w
    wm transient $w .
    message $w.m -text $msg -justify center -aspect 400
    pack $w.m -side top -fill x -padx 20 -pady 20
    button $w.ok -text OK -command "destroy $w"
    pack $w.ok -side bottom -fill x
    bind $w <Visibility> "grab $w; focus $w"
    tkwait window $w
}

proc makewindow {rargs} {
    global canv canv2 canv3 linespc charspc ctext cflist textfont
    global findtype findtypemenu findloc findstring fstring geometry
    global entries sha1entry sha1string sha1but
    global maincursor textcursor curtextcursor
    global rowctxmenu mergemax

    menu .bar
    .bar add cascade -label "File" -menu .bar.file
    menu .bar.file
    .bar.file add command -label "Update" -command [list updatecommits $rargs]
    .bar.file add command -label "Reread references" -command rereadrefs
    .bar.file add command -label "Quit" -command doquit
    menu .bar.edit
    .bar add cascade -label "Edit" -menu .bar.edit
    .bar.edit add command -label "Preferences" -command doprefs
    menu .bar.help
    .bar add cascade -label "Help" -menu .bar.help
    .bar.help add command -label "About gitk" -command about
    . configure -menu .bar

    if {![info exists geometry(canv1)]} {
	set geometry(canv1) [expr {45 * $charspc}]
	set geometry(canv2) [expr {30 * $charspc}]
	set geometry(canv3) [expr {15 * $charspc}]
	set geometry(canvh) [expr {25 * $linespc + 4}]
	set geometry(ctextw) 80
	set geometry(ctexth) 30
	set geometry(cflistw) 30
    }
    panedwindow .ctop -orient vertical
    if {[info exists geometry(width)]} {
	.ctop conf -width $geometry(width) -height $geometry(height)
	set texth [expr {$geometry(height) - $geometry(canvh) - 56}]
	set geometry(ctexth) [expr {($texth - 8) /
				    [font metrics $textfont -linespace]}]
    }
    frame .ctop.top
    frame .ctop.top.bar
    pack .ctop.top.bar -side bottom -fill x
    set cscroll .ctop.top.csb
    scrollbar $cscroll -command {allcanvs yview} -highlightthickness 0
    pack $cscroll -side right -fill y
    panedwindow .ctop.top.clist -orient horizontal -sashpad 0 -handlesize 4
    pack .ctop.top.clist -side top -fill both -expand 1
    .ctop add .ctop.top
    set canv .ctop.top.clist.canv
    canvas $canv -height $geometry(canvh) -width $geometry(canv1) \
	-bg white -bd 0 \
	-yscrollincr $linespc -yscrollcommand "$cscroll set"
    .ctop.top.clist add $canv
    set canv2 .ctop.top.clist.canv2
    canvas $canv2 -height $geometry(canvh) -width $geometry(canv2) \
	-bg white -bd 0 -yscrollincr $linespc
    .ctop.top.clist add $canv2
    set canv3 .ctop.top.clist.canv3
    canvas $canv3 -height $geometry(canvh) -width $geometry(canv3) \
	-bg white -bd 0 -yscrollincr $linespc
    .ctop.top.clist add $canv3
    bind .ctop.top.clist <Configure> {resizeclistpanes %W %w}

    set sha1entry .ctop.top.bar.sha1
    set entries $sha1entry
    set sha1but .ctop.top.bar.sha1label
    button $sha1but -text "SHA1 ID: " -state disabled -relief flat \
	-command gotocommit -width 8
    $sha1but conf -disabledforeground [$sha1but cget -foreground]
    pack .ctop.top.bar.sha1label -side left
    entry $sha1entry -width 40 -font $textfont -textvariable sha1string
    trace add variable sha1string write sha1change
    pack $sha1entry -side left -pady 2

    image create bitmap bm-left -data {
	#define left_width 16
	#define left_height 16
	static unsigned char left_bits[] = {
	0x00, 0x00, 0xc0, 0x01, 0xe0, 0x00, 0x70, 0x00, 0x38, 0x00, 0x1c, 0x00,
	0x0e, 0x00, 0xff, 0x7f, 0xff, 0x7f, 0xff, 0x7f, 0x0e, 0x00, 0x1c, 0x00,
	0x38, 0x00, 0x70, 0x00, 0xe0, 0x00, 0xc0, 0x01};
    }
    image create bitmap bm-right -data {
	#define right_width 16
	#define right_height 16
	static unsigned char right_bits[] = {
	0x00, 0x00, 0xc0, 0x01, 0x80, 0x03, 0x00, 0x07, 0x00, 0x0e, 0x00, 0x1c,
	0x00, 0x38, 0xff, 0x7f, 0xff, 0x7f, 0xff, 0x7f, 0x00, 0x38, 0x00, 0x1c,
	0x00, 0x0e, 0x00, 0x07, 0x80, 0x03, 0xc0, 0x01};
    }
    button .ctop.top.bar.leftbut -image bm-left -command goback \
	-state disabled -width 26
    pack .ctop.top.bar.leftbut -side left -fill y
    button .ctop.top.bar.rightbut -image bm-right -command goforw \
	-state disabled -width 26
    pack .ctop.top.bar.rightbut -side left -fill y

    button .ctop.top.bar.findbut -text "Find" -command dofind
    pack .ctop.top.bar.findbut -side left
    set findstring {}
    set fstring .ctop.top.bar.findstring
    lappend entries $fstring
    entry $fstring -width 30 -font $textfont -textvariable findstring
    pack $fstring -side left -expand 1 -fill x
    set findtype Exact
    set findtypemenu [tk_optionMenu .ctop.top.bar.findtype \
			  findtype Exact IgnCase Regexp]
    set findloc "All fields"
    tk_optionMenu .ctop.top.bar.findloc findloc "All fields" Headline \
	Comments Author Committer Files Pickaxe
    pack .ctop.top.bar.findloc -side right
    pack .ctop.top.bar.findtype -side right
    # for making sure type==Exact whenever loc==Pickaxe
    trace add variable findloc write findlocchange

    panedwindow .ctop.cdet -orient horizontal
    .ctop add .ctop.cdet
    frame .ctop.cdet.left
    set ctext .ctop.cdet.left.ctext
    text $ctext -bg white -state disabled -font $textfont \
	-width $geometry(ctextw) -height $geometry(ctexth) \
	-yscrollcommand ".ctop.cdet.left.sb set" -wrap none
    scrollbar .ctop.cdet.left.sb -command "$ctext yview"
    pack .ctop.cdet.left.sb -side right -fill y
    pack $ctext -side left -fill both -expand 1
    .ctop.cdet add .ctop.cdet.left

    $ctext tag conf filesep -font [concat $textfont bold] -back "#aaaaaa"
    $ctext tag conf hunksep -fore blue
    $ctext tag conf d0 -fore red
    $ctext tag conf d1 -fore "#00a000"
    $ctext tag conf m0 -fore red
    $ctext tag conf m1 -fore blue
    $ctext tag conf m2 -fore green
    $ctext tag conf m3 -fore purple
    $ctext tag conf m4 -fore brown
    $ctext tag conf mmax -fore darkgrey
    set mergemax 5
    $ctext tag conf mresult -font [concat $textfont bold]
    $ctext tag conf msep -font [concat $textfont bold]
    $ctext tag conf found -back yellow

    frame .ctop.cdet.right
    set cflist .ctop.cdet.right.cfiles
    listbox $cflist -bg white -selectmode extended -width $geometry(cflistw) \
	-yscrollcommand ".ctop.cdet.right.sb set"
    scrollbar .ctop.cdet.right.sb -command "$cflist yview"
    pack .ctop.cdet.right.sb -side right -fill y
    pack $cflist -side left -fill both -expand 1
    .ctop.cdet add .ctop.cdet.right
    bind .ctop.cdet <Configure> {resizecdetpanes %W %w}

    pack .ctop -side top -fill both -expand 1

    bindall <1> {selcanvline %W %x %y}
    #bindall <B1-Motion> {selcanvline %W %x %y}
    bindall <ButtonRelease-4> "allcanvs yview scroll -5 units"
    bindall <ButtonRelease-5> "allcanvs yview scroll 5 units"
    bindall <2> "allcanvs scan mark 0 %y"
    bindall <B2-Motion> "allcanvs scan dragto 0 %y"
    bind . <Key-Up> "selnextline -1"
    bind . <Key-Down> "selnextline 1"
    bind . <Key-Right> "goforw"
    bind . <Key-Left> "goback"
    bind . <Key-Prior> "allcanvs yview scroll -1 pages"
    bind . <Key-Next> "allcanvs yview scroll 1 pages"
    bindkey <Key-Delete> "$ctext yview scroll -1 pages"
    bindkey <Key-BackSpace> "$ctext yview scroll -1 pages"
    bindkey <Key-space> "$ctext yview scroll 1 pages"
    bindkey p "selnextline -1"
    bindkey n "selnextline 1"
    bindkey z "goback"
    bindkey x "goforw"
    bindkey i "selnextline -1"
    bindkey k "selnextline 1"
    bindkey j "goback"
    bindkey l "goforw"
    bindkey b "$ctext yview scroll -1 pages"
    bindkey d "$ctext yview scroll 18 units"
    bindkey u "$ctext yview scroll -18 units"
    bindkey / {findnext 1}
    bindkey <Key-Return> {findnext 0}
    bindkey ? findprev
    bindkey f nextfile
    bind . <Control-q> doquit
    bind . <Control-f> dofind
    bind . <Control-g> {findnext 0}
    bind . <Control-r> findprev
    bind . <Control-equal> {incrfont 1}
    bind . <Control-KP_Add> {incrfont 1}
    bind . <Control-minus> {incrfont -1}
    bind . <Control-KP_Subtract> {incrfont -1}
    bind $cflist <<ListboxSelect>> listboxsel
    bind . <Destroy> {savestuff %W}
    bind . <Button-1> "click %W"
    bind $fstring <Key-Return> dofind
    bind $sha1entry <Key-Return> gotocommit
    bind $sha1entry <<PasteSelection>> clearsha1

    set maincursor [. cget -cursor]
    set textcursor [$ctext cget -cursor]
    set curtextcursor $textcursor

    set rowctxmenu .rowctxmenu
    menu $rowctxmenu -tearoff 0
    $rowctxmenu add command -label "Diff this -> selected" \
	-command {diffvssel 0}
    $rowctxmenu add command -label "Diff selected -> this" \
	-command {diffvssel 1}
    $rowctxmenu add command -label "Make patch" -command mkpatch
    $rowctxmenu add command -label "Create tag" -command mktag
    $rowctxmenu add command -label "Write commit to file" -command writecommit
}

# when we make a key binding for the toplevel, make sure
# it doesn't get triggered when that key is pressed in the
# find string entry widget.
proc bindkey {ev script} {
    global entries
    bind . $ev $script
    set escript [bind Entry $ev]
    if {$escript == {}} {
	set escript [bind Entry <Key>]
    }
    foreach e $entries {
	bind $e $ev "$escript; break"
    }
}

# set the focus back to the toplevel for any click outside
# the entry widgets
proc click {w} {
    global entries
    foreach e $entries {
	if {$w == $e} return
    }
    focus .
}

proc savestuff {w} {
    global canv canv2 canv3 ctext cflist mainfont textfont
    global stuffsaved findmergefiles maxgraphpct
    global maxwidth

    if {$stuffsaved} return
    if {![winfo viewable .]} return
    catch {
	set f [open "~/.gitk-new" w]
	puts $f [list set mainfont $mainfont]
	puts $f [list set textfont $textfont]
	puts $f [list set findmergefiles $findmergefiles]
	puts $f [list set maxgraphpct $maxgraphpct]
	puts $f [list set maxwidth $maxwidth]
	puts $f "set geometry(width) [winfo width .ctop]"
	puts $f "set geometry(height) [winfo height .ctop]"
	puts $f "set geometry(canv1) [expr {[winfo width $canv]-2}]"
	puts $f "set geometry(canv2) [expr {[winfo width $canv2]-2}]"
	puts $f "set geometry(canv3) [expr {[winfo width $canv3]-2}]"
	puts $f "set geometry(canvh) [expr {[winfo height $canv]-2}]"
	set wid [expr {([winfo width $ctext] - 8) \
			   / [font measure $textfont "0"]}]
	puts $f "set geometry(ctextw) $wid"
	set wid [expr {([winfo width $cflist] - 11) \
			   / [font measure [$cflist cget -font] "0"]}]
	puts $f "set geometry(cflistw) $wid"
	close $f
	file rename -force "~/.gitk-new" "~/.gitk"
    }
    set stuffsaved 1
}

proc resizeclistpanes {win w} {
    global oldwidth
    if [info exists oldwidth($win)] {
	set s0 [$win sash coord 0]
	set s1 [$win sash coord 1]
	if {$w < 60} {
	    set sash0 [expr {int($w/2 - 2)}]
	    set sash1 [expr {int($w*5/6 - 2)}]
	} else {
	    set factor [expr {1.0 * $w / $oldwidth($win)}]
	    set sash0 [expr {int($factor * [lindex $s0 0])}]
	    set sash1 [expr {int($factor * [lindex $s1 0])}]
	    if {$sash0 < 30} {
		set sash0 30
	    }
	    if {$sash1 < $sash0 + 20} {
		set sash1 [expr {$sash0 + 20}]
	    }
	    if {$sash1 > $w - 10} {
		set sash1 [expr {$w - 10}]
		if {$sash0 > $sash1 - 20} {
		    set sash0 [expr {$sash1 - 20}]
		}
	    }
	}
	$win sash place 0 $sash0 [lindex $s0 1]
	$win sash place 1 $sash1 [lindex $s1 1]
    }
    set oldwidth($win) $w
}

proc resizecdetpanes {win w} {
    global oldwidth
    if [info exists oldwidth($win)] {
	set s0 [$win sash coord 0]
	if {$w < 60} {
	    set sash0 [expr {int($w*3/4 - 2)}]
	} else {
	    set factor [expr {1.0 * $w / $oldwidth($win)}]
	    set sash0 [expr {int($factor * [lindex $s0 0])}]
	    if {$sash0 < 45} {
		set sash0 45
	    }
	    if {$sash0 > $w - 15} {
		set sash0 [expr {$w - 15}]
	    }
	}
	$win sash place 0 $sash0 [lindex $s0 1]
    }
    set oldwidth($win) $w
}

proc allcanvs args {
    global canv canv2 canv3
    eval $canv $args
    eval $canv2 $args
    eval $canv3 $args
}

proc bindall {event action} {
    global canv canv2 canv3
    bind $canv $event $action
    bind $canv2 $event $action
    bind $canv3 $event $action
}

proc about {} {
    set w .about
    if {[winfo exists $w]} {
	raise $w
	return
    }
    toplevel $w
    wm title $w "About gitk"
    message $w.m -text {
Gitk version 1.2