[thirdparty/git.git] / gitk

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

# Copyright (C) 2005-2006 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 [exec git rev-parse --git-dir]
    }
}

# A simple scheduler for compute-intensive stuff.
# The aim is to make sure that event handlers for GUI actions can
# run at least every 50-100 ms.  Unfortunately fileevent handlers are
# run before X event handlers, so reading from a fast source can
# make the GUI completely unresponsive.
proc run args {
    global isonrunq runq

    set script $args
    if {[info exists isonrunq($script)]} return
    if {$runq eq {}} {
	after idle dorunq
    }
    lappend runq [list {} $script]
    set isonrunq($script) 1
}

proc filerun {fd script} {
    fileevent $fd readable [list filereadable $fd $script]
}

proc filereadable {fd script} {
    global runq

    fileevent $fd readable {}
    if {$runq eq {}} {
	after idle dorunq
    }
    lappend runq [list $fd $script]
}

proc dorunq {} {
    global isonrunq runq

    set tstart [clock clicks -milliseconds]
    set t0 $tstart
    while {$runq ne {}} {
	set fd [lindex $runq 0 0]
	set script [lindex $runq 0 1]
	set repeat [eval $script]
	set t1 [clock clicks -milliseconds]
	set t [expr {$t1 - $t0}]
	set runq [lrange $runq 1 end]
	if {$repeat ne {} && $repeat} {
	    if {$fd eq {} || $repeat == 2} {
		# script returns 1 if it wants to be readded
		# file readers return 2 if they could do more straight away
		lappend runq [list $fd $script]
	    } else {
		fileevent $fd readable [list filereadable $fd $script]
	    }
	} elseif {$fd eq {}} {
	    unset isonrunq($script)
	}
	set t0 $t1
	if {$t1 - $tstart >= 80} break
    }
    if {$runq ne {}} {
	after idle dorunq
    }
}

# Start off a git rev-list process and arrange to read its output
proc start_rev_list {view} {
    global startmsecs
    global commfd leftover tclencoding datemode
    global viewargs viewfiles commitidx
    global lookingforhead showlocalchanges

    set startmsecs [clock clicks -milliseconds]
    set commitidx($view) 0
    set order "--topo-order"
    if {$datemode} {
	set order "--date-order"
    }
    if {[catch {
	set fd [open [concat | git log -z --pretty=raw $order --parents \
			 --boundary $viewargs($view) "--" $viewfiles($view)] r]
    } err]} {
	error_popup "Error executing git rev-list: $err"
	exit 1
    }
    set commfd($view) $fd
    set leftover($view) {}
    set lookingforhead $showlocalchanges
    fconfigure $fd -blocking 0 -translation lf -eofchar {}
    if {$tclencoding != {}} {
	fconfigure $fd -encoding $tclencoding
    }
    filerun $fd [list getcommitlines $fd $view]
    nowbusy $view
}

proc stop_rev_list {} {
    global commfd curview

    if {![info exists commfd($curview)]} return
    set fd $commfd($curview)
    catch {
	set pid [pid $fd]
	exec kill $pid
    }
    catch {close $fd}
    unset commfd($curview)
}

proc getcommits {} {
    global phase canv mainfont curview

    set phase getcommits
    initlayout
    start_rev_list $curview
    show_status "Reading commits..."
}

proc getcommitlines {fd view}  {
    global commitlisted
    global leftover commfd
    global displayorder commitidx commitrow commitdata
    global parentlist children curview hlview
    global vparentlist vdisporder vcmitlisted

    set stuff [read $fd 500000]
    # git log doesn't terminate the last commit with a null...
    if {$stuff == {} && $leftover($view) ne {} && [eof $fd]} {
	set stuff "\0"
    }
    if {$stuff == {}} {
	if {![eof $fd]} {
	    return 1
	}
	global viewname
	unset commfd($view)
	notbusy $view
	# set it blocking so we wait for the process to terminate
	fconfigure $fd -blocking 1
	if {[catch {close $fd} err]} {
	    set fv {}
	    if {$view != $curview} {
		set fv " for the \"$viewname($view)\" view"
	    }
	    if {[string range $err 0 4] == "usage"} {
		set err "Gitk: error reading commits$fv:\
			bad arguments to git rev-list."
		if {$viewname($view) eq "Command line"} {
		    append err \
			"  (Note: arguments to gitk are passed to git rev-list\
			 to allow selection of commits to be displayed.)"
		}
	    } else {
		set err "Error reading commits$fv: $err"
	    }
	    error_popup $err
	}
	if {$view == $curview} {
	    run chewcommits $view
	}
	return 0
    }
    set start 0
    set gotsome 0
    while 1 {
	set i [string first "\0" $stuff $start]
	if {$i < 0} {
	    append leftover($view) [string range $stuff $start end]
	    break
	}
	if {$start == 0} {
	    set cmit $leftover($view)
	    append cmit [string range $stuff 0 [expr {$i - 1}]]
	    set leftover($view) {}
	} else {
	    set cmit [string range $stuff $start [expr {$i - 1}]]
	}
	set start [expr {$i + 1}]
	set j [string first "\n" $cmit]
	set ok 0
	set listed 1
	if {$j >= 0 && [string match "commit *" $cmit]} {
	    set ids [string range $cmit 7 [expr {$j - 1}]]
	    if {[string match {[-<>]*} $ids]} {
		switch -- [string index $ids 0] {
		    "-" {set listed 0}
		    "<" {set listed 2}
		    ">" {set listed 3}
		}
		set ids [string range $ids 1 end]
	    }
	    set ok 1
	    foreach id $ids {
		if {[string length $id] != 40} {
		    set ok 0
		    break
		}
	    }
	}
	if {!$ok} {
	    set shortcmit $cmit
	    if {[string length $shortcmit] > 80} {
		set shortcmit "[string range $shortcmit 0 80]..."
	    }
	    error_popup "Can't parse git log output: {$shortcmit}"
	    exit 1
	}
	set id [lindex $ids 0]
	if {$listed} {
	    set olds [lrange $ids 1 end]
	    set i 0
	    foreach p $olds {
		if {$i == 0 || [lsearch -exact $olds $p] >= $i} {
		    lappend children($view,$p) $id
		}
		incr i
	    }
	} else {
	    set olds {}
	}
	if {![info exists children($view,$id)]} {
	    set children($view,$id) {}
	}
	set commitdata($id) [string range $cmit [expr {$j + 1}] end]
	set commitrow($view,$id) $commitidx($view)
	incr commitidx($view)
	if {$view == $curview} {
	    lappend parentlist $olds
	    lappend displayorder $id
	    lappend commitlisted $listed
	} else {
	    lappend vparentlist($view) $olds
	    lappend vdisporder($view) $id
	    lappend vcmitlisted($view) $listed
	}
	set gotsome 1
    }
    if {$gotsome} {
	run chewcommits $view
    }
    return 2
}

proc chewcommits {view} {
    global curview hlview commfd
    global selectedline pending_select

    set more 0
    if {$view == $curview} {
	set allread [expr {![info exists commfd($view)]}]
	set tlimit [expr {[clock clicks -milliseconds] + 50}]
	set more [layoutmore $tlimit $allread]
	if {$allread && !$more} {
	    global displayorder commitidx phase
	    global numcommits startmsecs

	    if {[info exists pending_select]} {
		set row [first_real_row]
		selectline $row 1
	    }
	    if {$commitidx($curview) > 0} {
		#set ms [expr {[clock clicks -milliseconds] - $startmsecs}]
		#puts "overall $ms ms for $numcommits commits"
	    } else {
		show_status "No commits selected"
	    }
	    notbusy layout
	    set phase {}
	}
    }
    if {[info exists hlview] && $view == $hlview} {
	vhighlightmore
    }
    return $more
}

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

proc updatecommits {} {
    global viewdata curview phase displayorder
    global children commitrow selectedline thickerline showneartags

    if {$phase ne {}} {
	stop_rev_list
	set phase {}
    }
    set n $curview
    foreach id $displayorder {
	catch {unset children($n,$id)}
	catch {unset commitrow($n,$id)}
    }
    set curview -1
    catch {unset selectedline}
    catch {unset thickerline}
    catch {unset viewdata($n)}
    readrefs
    changedrefs
    if {$showneartags} {
	getallcommits
    }
    showview $n
}

proc parsecommit {id contents listed} {
    global commitinfo cdate

    set inhdr 1
    set comment {}
    set headline {}
    set auname {}
    set audate {}
    set comname {}
    set comdate {}
    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 non-blank line of the comment as the headline
    set headline [string trimleft $comment]
    set i [string first "\n" $headline]
    if {$i >= 0} {
	set headline [string range $headline 0 $i]
    }
    set headline [string trimright $headline]
    set i [string first "\r" $headline]
    if {$i >= 0} {
	set headline [string trimright [string range $headline 0 $i]]
    }
    if {!$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 getcommit {id} {
    global commitdata commitinfo

    if {[info exists commitdata($id)]} {
	parsecommit $id $commitdata($id) 1
    } else {
	readcommit $id
	if {![info exists commitinfo($id)]} {
	    set commitinfo($id) {"No commit information available"}
	}
    }
    return 1
}

proc readrefs {} {
    global tagids idtags headids idheads tagobjid
    global otherrefids idotherrefs mainhead mainheadid

    foreach v {tagids idtags headids idheads otherrefids idotherrefs} {
	catch {unset $v}
    }
    set refd [open [list | git show-ref -d] r]
    while {[gets $refd line] >= 0} {
	if {[string index $line 40] ne " "} continue
	set id [string range $line 0 39]
	set ref [string range $line 41 end]
	if {![string match "refs/*" $ref]} continue
	set name [string range $ref 5 end]
	if {[string match "remotes/*" $name]} {
	    if {![string match "*/HEAD" $name]} {
		set headids($name) $id
		lappend idheads($id) $name
	    }
	} elseif {[string match "heads/*" $name]} {
	    set name [string range $name 6 end]
	    set headids($name) $id
	    lappend idheads($id) $name
	} elseif {[string match "tags/*" $name]} {
	    # this lets refs/tags/foo^{} overwrite refs/tags/foo,
	    # which is what we want since the former is the commit ID
	    set name [string range $name 5 end]
	    if {[string match "*^{}" $name]} {
		set name [string range $name 0 end-3]
	    } else {
		set tagobjid($name) $id
	    }
	    set tagids($name) $id
	    lappend idtags($id) $name
	} else {
	    set otherrefids($name) $id
	    lappend idotherrefs($id) $name
	}
    }
    catch {close $refd}
    set mainhead {}
    set mainheadid {}
    catch {
	set thehead [exec git symbolic-ref HEAD]
	if {[string match "refs/heads/*" $thehead]} {
	    set mainhead [string range $thehead 11 end]
	    if {[info exists headids($mainhead)]} {
		set mainheadid $headids($mainhead)
	    }
	}
    }
}

# skip over fake commits
proc first_real_row {} {
    global nullid nullid2 displayorder numcommits

    for {set row 0} {$row < $numcommits} {incr row} {
	set id [lindex $displayorder $row]
	if {$id ne $nullid && $id ne $nullid2} {
	    break
	}
    }
    return $row
}

# update things for a head moved to a child of its previous location
proc movehead {id name} {
    global headids idheads

    removehead $headids($name) $name
    set headids($name) $id
    lappend idheads($id) $name
}

# update things when a head has been removed
proc removehead {id name} {
    global headids idheads

    if {$idheads($id) eq $name} {
	unset idheads($id)
    } else {
	set i [lsearch -exact $idheads($id) $name]
	if {$i >= 0} {
	    set idheads($id) [lreplace $idheads($id) $i $i]
	}
    }
    unset headids($name)
}

proc show_error {w top msg} {
    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 $top"
    pack $w.ok -side bottom -fill x
    bind $top <Visibility> "grab $top; focus $top"
    bind $top <Key-Return> "destroy $top"
    tkwait window $top
}

proc error_popup msg {
    set w .error
    toplevel $w
    wm transient $w .
    show_error $w $w $msg
}

proc confirm_popup msg {
    global confirm_ok
    set confirm_ok 0
    set w .confirm
    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 "set confirm_ok 1; destroy $w"
    pack $w.ok -side left -fill x
    button $w.cancel -text Cancel -command "destroy $w"
    pack $w.cancel -side right -fill x
    bind $w <Visibility> "grab $w; focus $w"
    tkwait window $w
    return $confirm_ok
}

proc makewindow {} {
    global canv canv2 canv3 linespc charspc ctext cflist
    global textfont mainfont uifont tabstop
    global findtype findtypemenu findloc findstring fstring geometry
    global entries sha1entry sha1string sha1but
    global diffcontextstring diffcontext
    global maincursor textcursor curtextcursor
    global rowctxmenu fakerowmenu mergemax wrapcomment
    global highlight_files gdttype
    global searchstring sstring
    global bgcolor fgcolor bglist fglist diffcolors selectbgcolor
    global headctxmenu

    menu .bar
    .bar add cascade -label "File" -menu .bar.file
    .bar configure -font $uifont
    menu .bar.file
    .bar.file add command -label "Update" -command updatecommits
    .bar.file add command -label "Reread references" -command rereadrefs
    .bar.file add command -label "List references" -command showrefs
    .bar.file add command -label "Quit" -command doquit
    .bar.file configure -font $uifont
    menu .bar.edit
    .bar add cascade -label "Edit" -menu .bar.edit
    .bar.edit add command -label "Preferences" -command doprefs
    .bar.edit configure -font $uifont

    menu .bar.view -font $uifont
    .bar add cascade -label "View" -menu .bar.view
    .bar.view add command -label "New view..." -command {newview 0}
    .bar.view add command -label "Edit view..." -command editview \
	-state disabled
    .bar.view add command -label "Delete view" -command delview -state disabled
    .bar.view add separator
    .bar.view add radiobutton -label "All files" -command {showview 0} \
	-variable selectedview -value 0

    menu .bar.help
    .bar add cascade -label "Help" -menu .bar.help
    .bar.help add command -label "About gitk" -command about
    .bar.help add command -label "Key bindings" -command keys
    .bar.help configure -font $uifont
    . configure -menu .bar

    # the gui has upper and lower half, parts of a paned window.
    panedwindow .ctop -orient vertical

    # possibly use assumed geometry
    if {![info exists geometry(pwsash0)]} {
        set geometry(topheight) [expr {15 * $linespc}]
        set geometry(topwidth) [expr {80 * $charspc}]
        set geometry(botheight) [expr {15 * $linespc}]
        set geometry(botwidth) [expr {50 * $charspc}]
        set geometry(pwsash0) "[expr {40 * $charspc}] 2"
        set geometry(pwsash1) "[expr {60 * $charspc}] 2"
    }

    # the upper half will have a paned window, a scroll bar to the right, and some stuff below
    frame .tf -height $geometry(topheight) -width $geometry(topwidth)
    frame .tf.histframe
    panedwindow .tf.histframe.pwclist -orient horizontal -sashpad 0 -handlesize 4

    # create three canvases
    set cscroll .tf.histframe.csb
    set canv .tf.histframe.pwclist.canv
    canvas $canv \
	-selectbackground $selectbgcolor \
	-background $bgcolor -bd 0 \
	-yscrollincr $linespc -yscrollcommand "scrollcanv $cscroll"
    .tf.histframe.pwclist add $canv
    set canv2 .tf.histframe.pwclist.canv2
    canvas $canv2 \
	-selectbackground $selectbgcolor \
	-background $bgcolor -bd 0 -yscrollincr $linespc
    .tf.histframe.pwclist add $canv2
    set canv3 .tf.histframe.pwclist.canv3
    canvas $canv3 \
	-selectbackground $selectbgcolor \
	-background $bgcolor -bd 0 -yscrollincr $linespc
    .tf.histframe.pwclist add $canv3
    eval .tf.histframe.pwclist sash place 0 $geometry(pwsash0)
    eval .tf.histframe.pwclist sash place 1 $geometry(pwsash1)

    # a scroll bar to rule them
    scrollbar $cscroll -command {allcanvs yview} -highlightthickness 0
    pack $cscroll -side right -fill y
    bind .tf.histframe.pwclist <Configure> {resizeclistpanes %W %w}
    lappend bglist $canv $canv2 $canv3
    pack .tf.histframe.pwclist -fill both -expand 1 -side left

    # we have two button bars at bottom of top frame. Bar 1
    frame .tf.bar
    frame .tf.lbar -height 15

    set sha1entry .tf.bar.sha1
    set entries $sha1entry
    set sha1but .tf.bar.sha1label
    button $sha1but -text "SHA1 ID: " -state disabled -relief flat \
	-command gotocommit -width 8 -font $uifont
    $sha1but conf -disabledforeground [$sha1but cget -foreground]
    pack .tf.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 .tf.bar.leftbut -image bm-left -command goback \
	-state disabled -width 26
    pack .tf.bar.leftbut -side left -fill y
    button .tf.bar.rightbut -image bm-right -command goforw \
	-state disabled -width 26
    pack .tf.bar.rightbut -side left -fill y

    button .tf.bar.findbut -text "Find" -command dofind -font $uifont
    pack .tf.bar.findbut -side left
    set findstring {}
    set fstring .tf.bar.findstring
    lappend entries $fstring
    entry $fstring -width 30 -font $textfont -textvariable findstring
    trace add variable findstring write find_change
    pack $fstring -side left -expand 1 -fill x -in .tf.bar
    set findtype Exact
    set findtypemenu [tk_optionMenu .tf.bar.findtype \
		      findtype Exact IgnCase Regexp]
    trace add variable findtype write find_change
    .tf.bar.findtype configure -font $uifont
    .tf.bar.findtype.menu configure -font $uifont
    set findloc "All fields"
    tk_optionMenu .tf.bar.findloc findloc "All fields" Headline \
	Comments Author Committer
    trace add variable findloc write find_change
    .tf.bar.findloc configure -font $uifont
    .tf.bar.findloc.menu configure -font $uifont
    pack .tf.bar.findloc -side right
    pack .tf.bar.findtype -side right

    # build up the bottom bar of upper window
    label .tf.lbar.flabel -text "Highlight:  Commits " \
    -font $uifont
    pack .tf.lbar.flabel -side left -fill y
    set gdttype "touching paths:"
    set gm [tk_optionMenu .tf.lbar.gdttype gdttype "touching paths:" \
	"adding/removing string:"]
    trace add variable gdttype write hfiles_change
    $gm conf -font $uifont
    .tf.lbar.gdttype conf -font $uifont
    pack .tf.lbar.gdttype -side left -fill y
    entry .tf.lbar.fent -width 25 -font $textfont \
	-textvariable highlight_files
    trace add variable highlight_files write hfiles_change
    lappend entries .tf.lbar.fent
    pack .tf.lbar.fent -side left -fill x -expand 1
    label .tf.lbar.vlabel -text " OR in view" -font $uifont
    pack .tf.lbar.vlabel -side left -fill y
    global viewhlmenu selectedhlview
    set viewhlmenu [tk_optionMenu .tf.lbar.vhl selectedhlview None]
    $viewhlmenu entryconf None -command delvhighlight
    $viewhlmenu conf -font $uifont
    .tf.lbar.vhl conf -font $uifont
    pack .tf.lbar.vhl -side left -fill y
    label .tf.lbar.rlabel -text " OR " -font $uifont
    pack .tf.lbar.rlabel -side left -fill y
    global highlight_related
    set m [tk_optionMenu .tf.lbar.relm highlight_related None \
	"Descendent" "Not descendent" "Ancestor" "Not ancestor"]
    $m conf -font $uifont
    .tf.lbar.relm conf -font $uifont
    trace add variable highlight_related write vrel_change
    pack .tf.lbar.relm -side left -fill y

    # Finish putting the upper half of the viewer together
    pack .tf.lbar -in .tf -side bottom -fill x
    pack .tf.bar -in .tf -side bottom -fill x
    pack .tf.histframe -fill both -side top -expand 1
    .ctop add .tf
    .ctop paneconfigure .tf -height $geometry(topheight)
    .ctop paneconfigure .tf -width $geometry(topwidth)

    # now build up the bottom
    panedwindow .pwbottom -orient horizontal

    # lower left, a text box over search bar, scroll bar to the right
    # if we know window height, then that will set the lower text height, otherwise
    # we set lower text height which will drive window height
    if {[info exists geometry(main)]} {
        frame .bleft -width $geometry(botwidth)
    } else {
        frame .bleft -width $geometry(botwidth) -height $geometry(botheight)
    }
    frame .bleft.top
    frame .bleft.mid

    button .bleft.top.search -text "Search" -command dosearch \
	-font $uifont
    pack .bleft.top.search -side left -padx 5
    set sstring .bleft.top.sstring
    entry $sstring -width 20 -font $textfont -textvariable searchstring
    lappend entries $sstring
    trace add variable searchstring write incrsearch
    pack $sstring -side left -expand 1 -fill x
    radiobutton .bleft.mid.diff -text "Diff" \
	-command changediffdisp -variable diffelide -value {0 0}
    radiobutton .bleft.mid.old -text "Old version" \
	-command changediffdisp -variable diffelide -value {0 1}
    radiobutton .bleft.mid.new -text "New version" \
	-command changediffdisp -variable diffelide -value {1 0}
    label .bleft.mid.labeldiffcontext -text "      Lines of context: " \
	-font $uifont
    pack .bleft.mid.diff .bleft.mid.old .bleft.mid.new -side left
    spinbox .bleft.mid.diffcontext -width 5 -font $textfont \
	-from 1 -increment 1 -to 10000000 \
	-validate all -validatecommand "diffcontextvalidate %P" \
	-textvariable diffcontextstring
    .bleft.mid.diffcontext set $diffcontext
    trace add variable diffcontextstring write diffcontextchange
    lappend entries .bleft.mid.diffcontext
    pack .bleft.mid.labeldiffcontext .bleft.mid.diffcontext -side left
    set ctext .bleft.ctext
    text $ctext -background $bgcolor -foreground $fgcolor \
	-tabs "[expr {$tabstop * $charspc}]" \
	-state disabled -font $textfont \
	-yscrollcommand scrolltext -wrap none
    scrollbar .bleft.sb -command "$ctext yview"
    pack .bleft.top -side top -fill x
    pack .bleft.mid -side top -fill x
    pack .bleft.sb -side right -fill y
    pack $ctext -side left -fill both -expand 1
    lappend bglist $ctext
    lappend fglist $ctext

    $ctext tag conf comment -wrap $wrapcomment
    $ctext tag conf filesep -font [concat $textfont bold] -back "#aaaaaa"
    $ctext tag conf hunksep -fore [lindex $diffcolors 2]
    $ctext tag conf d0 -fore [lindex $diffcolors 0]
    $ctext tag conf d1 -fore [lindex $diffcolors 1]
    $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 m5 -fore "#009090"
    $ctext tag conf m6 -fore magenta
    $ctext tag conf m7 -fore "#808000"
    $ctext tag conf m8 -fore "#009000"
    $ctext tag conf m9 -fore "#ff0080"
    $ctext tag conf m10 -fore cyan
    $ctext tag conf m11 -fore "#b07070"
    $ctext tag conf m12 -fore "#70b0f0"
    $ctext tag conf m13 -fore "#70f0b0"
    $ctext tag conf m14 -fore "#f0b070"
    $ctext tag conf m15 -fore "#ff70b0"
    $ctext tag conf mmax -fore darkgrey
    set mergemax 16
    $ctext tag conf mresult -font [concat $textfont bold]
    $ctext tag conf msep -font [concat $textfont bold]
    $ctext tag conf found -back yellow

    .pwbottom add .bleft
    .pwbottom paneconfigure .bleft -width $geometry(botwidth)

    # lower right
    frame .bright
    frame .bright.mode
    radiobutton .bright.mode.patch -text "Patch" \
	-command reselectline -variable cmitmode -value "patch"
    .bright.mode.patch configure -font $uifont
    radiobutton .bright.mode.tree -text "Tree" \
	-command reselectline -variable cmitmode -value "tree"
    .bright.mode.tree configure -font $uifont
    grid .bright.mode.patch .bright.mode.tree -sticky ew
    pack .bright.mode -side top -fill x
    set cflist .bright.cfiles
    set indent [font measure $mainfont "nn"]
    text $cflist \
	-selectbackground $selectbgcolor \
	-background $bgcolor -foreground $fgcolor \
	-font $mainfont \
	-tabs [list $indent [expr {2 * $indent}]] \
	-yscrollcommand ".bright.sb set" \
	-cursor [. cget -cursor] \
	-spacing1 1 -spacing3 1
    lappend bglist $cflist
    lappend fglist $cflist
    scrollbar .bright.sb -command "$cflist yview"
    pack .bright.sb -side right -fill y
    pack $cflist -side left -fill both -expand 1
    $cflist tag configure highlight \
	-background [$cflist cget -selectbackground]
    $cflist tag configure bold -font [concat $mainfont bold]

    .pwbottom add .bright
    .ctop add .pwbottom

    # restore window position if known
    if {[info exists geometry(main)]} {
        wm geometry . "$geometry(main)"
    }

    if {[tk windowingsystem] eq {aqua}} {
        set M1B M1
    } else {
        set M1B Control
    }

    bind .pwbottom <Configure> {resizecdetpanes %W %w}
    pack .ctop -fill both -expand 1
    bindall <1> {selcanvline %W %x %y}
    #bindall <B1-Motion> {selcanvline %W %x %y}
    if {[tk windowingsystem] == "win32"} {
	bind . <MouseWheel> { windows_mousewheel_redirector %W %X %Y %D }
	bind $ctext <MouseWheel> { windows_mousewheel_redirector %W %X %Y %D ; break }
    } else {
	bindall <ButtonRelease-4> "allcanvs yview scroll -5 units"
	bindall <ButtonRelease-5> "allcanvs yview scroll 5 units"
    }
    bindall <2> "canvscan mark %W %x %y"
    bindall <B2-Motion> "canvscan dragto %W %x %y"
    bindkey <Home> selfirstline
    bindkey <End> sellastline
    bind . <Key-Up> "selnextline -1"
    bind . <Key-Down> "selnextline 1"
    bind . <Shift-Key-Up> "next_highlight -1"
    bind . <Shift-Key-Down> "next_highlight 1"
    bindkey <Key-Right> "goforw"
    bindkey <Key-Left> "goback"
    bind . <Key-Prior> "selnextpage -1"
    bind . <Key-Next> "selnextpage 1"
    bind . <$M1B-Home> "allcanvs yview moveto 0.0"
    bind . <$M1B-End> "allcanvs yview moveto 1.0"
    bind . <$M1B-Key-Up> "allcanvs yview scroll -1 units"
    bind . <$M1B-Key-Down> "allcanvs yview scroll 1 units"
    bind . <$M1B-Key-Prior> "allcanvs yview scroll -1 pages"
    bind . <$M1B-Key-Next> "allcanvs yview scroll 1 pages"
    bindkey <Key-Delete> "$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 "$ctext yview scroll -18 units"
    bindkey / {findnext 1}
    bindkey <Key-Return> {findnext 0}
    bindkey ? findprev
    bindkey f nextfile
    bindkey <F5> updatecommits
    bind . <$M1B-q> doquit
    bind . <$M1B-f> dofind
    bind . <$M1B-g> {findnext 0}
    bind . <$M1B-r> dosearchback
    bind . <$M1B-s> dosearch
    bind . <$M1B-equal> {incrfont 1}
    bind . <$M1B-KP_Add> {incrfont 1}
    bind . <$M1B-minus> {incrfont -1}
    bind . <$M1B-KP_Subtract> {incrfont -1}
    wm protocol . WM_DELETE_WINDOW doquit
    bind . <Button-1> "click %W"
    bind $fstring <Key-Return> dofind
    bind $sha1entry <Key-Return> gotocommit
    bind $sha1entry <<PasteSelection>> clearsha1
    bind $cflist <1> {sel_flist %W %x %y; break}
    bind $cflist <B1-Motion> {sel_flist %W %x %y; break}
    bind $cflist <ButtonRelease-1> {treeclick %W %x %y}
    bind $cflist <Button-3> {pop_flist_menu %W %X %Y %x %y}

    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
    $rowctxmenu add command -label "Create new branch" -command mkbranch
    $rowctxmenu add command -label "Cherry-pick this commit" \
	-command cherrypick
    $rowctxmenu add command -label "Reset HEAD branch to here" \
	-command resethead

    set fakerowmenu .fakerowmenu
    menu $fakerowmenu -tearoff 0
    $fakerowmenu add command -label "Diff this -> selected" \
	-command {diffvssel 0}
    $fakerowmenu add command -label "Diff selected -> this" \
	-command {diffvssel 1}
    $fakerowmenu add command -label "Make patch" -command mkpatch
#    $fakerowmenu add command -label "Commit" -command {mkcommit 0}
#    $fakerowmenu add command -label "Commit all" -command {mkcommit 1}
#    $fakerowmenu add command -label "Revert local changes" -command revertlocal

    set headctxmenu .headctxmenu
    menu $headctxmenu -tearoff 0
    $headctxmenu add command -label "Check out this branch" \
	-command cobranch
    $headctxmenu add command -label "Remove this branch" \
	-command rmbranch

    global flist_menu
    set flist_menu .flistctxmenu
    menu $flist_menu -tearoff 0
    $flist_menu add command -label "Highlight this too" \
	-command {flist_hl 0}
    $flist_menu add command -label "Highlight this only" \
	-command {flist_hl 1}
}

# Windows sends all mouse wheel events to the current focused window, not
# the one where the mouse hovers, so bind those events here and redirect
# to the correct window
proc windows_mousewheel_redirector {W X Y D} {
    global canv canv2 canv3
    set w [winfo containing -displayof $W $X $Y]
    if {$w ne ""} {
	set u [expr {$D < 0 ? 5 : -5}]
	if {$w == $canv || $w == $canv2 || $w == $canv3} {
	    allcanvs yview scroll $u units
	} else {
	    catch {
		$w yview scroll $u units
	    }
	}
    }
}

# mouse-2 makes all windows scan vertically, but only the one
# the cursor is in scans horizontally
proc canvscan {op w x y} {
    global canv canv2 canv3
    foreach c [list $canv $canv2 $canv3] {
	if {$c == $w} {
	    $c scan $op $x $y
	} else {
	    $c scan $op 0 $y
	}
    }
}

proc scrollcanv {cscroll f0 f1} {
    $cscroll set $f0 $f1
    drawfrac $f0 $f1
    flushhighlights
}

# 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 ctext entries
    foreach e [concat $entries $ctext] {
	if {$w == $e} return
    }
    focus .
}

proc savestuff {w} {
    global canv canv2 canv3 ctext cflist mainfont textfont uifont tabstop
    global stuffsaved findmergefiles maxgraphpct
    global maxwidth showneartags showlocalchanges
    global viewname viewfiles viewargs viewperm nextviewnum
    global cmitmode wrapcomment datetimeformat
    global colors bgcolor fgcolor diffcolors diffcontext selectbgcolor

    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 uifont $uifont]
	puts $f [list set tabstop $tabstop]
	puts $f [list set findmergefiles $findmergefiles]
	puts $f [list set maxgraphpct $maxgraphpct]
	puts $f [list set maxwidth $maxwidth]
	puts $f [list set cmitmode $cmitmode]
	puts $f [list set wrapcomment $wrapcomment]
	puts $f [list set showneartags $showneartags]
	puts $f [list set showlocalchanges $showlocalchanges]
	puts $f [list set datetimeformat $datetimeformat]
	puts $f [list set bgcolor $bgcolor]
	puts $f [list set fgcolor $fgcolor]
	puts $f [list set colors $colors]
	puts $f [list set diffcolors $diffcolors]
	puts $f [list set diffcontext $diffcontext]
	puts $f [list set selectbgcolor $selectbgcolor]

	puts $f "set geometry(main) [wm geometry .]"
	puts $f "set geometry(topwidth) [winfo width .tf]"
	puts $f "set geometry(topheight) [winfo height .tf]"
        puts $f "set geometry(pwsash0) \"[.tf.histframe.pwclist sash coord 0]\""
        puts $f "set geometry(pwsash1) \"[.tf.histframe.pwclist sash coord 1]\""
	puts $f "set geometry(botwidth) [winfo width .bleft]"
	puts $f "set geometry(botheight) [winfo height .bleft]"

	puts -nonewline $f "set permviews {"
	for {set v 0} {$v < $nextviewnum} {incr v} {
	    if {$viewperm($v)} {
		puts $f "{[list $viewname($v) $viewfiles($v) $viewargs($v)]}"
	    }
	}
	puts $f "}"
	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 {} {
    global uifont
    set w .about
    if {[winfo exists $w]} {
	raise $w
	return
    }
    toplevel $w
    wm title $w "About gitk"
    message $w.m -text {
Gitk - a commit viewer for git