#!/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 start_rev_list {view} {
    global startmsecs nextupdate ncmupdate
    global commfd leftover tclencoding datemode
    global viewargs viewfiles commitidx

    set startmsecs [clock clicks -milliseconds]
    set nextupdate [expr {$startmsecs + 100}]
    set ncmupdate 1
    set commitidx($view) 0
    set args $viewargs($view)
    if {$viewfiles($view) ne {}} {
	set args [concat $args "--" $viewfiles($view)]
    }
    set order "--topo-order"
    if {$datemode} {
	set order "--date-order"
    }
    if {[catch {
	set fd [open [concat | git rev-list --header $order \
			  --parents --boundary --default HEAD $args] r]
    } err]} {
	puts stderr "Error executing git rev-list: $err"
	exit 1
    }
    set commfd($view) $fd
    set leftover($view) {}
    fconfigure $fd -blocking 0 -translation lf
    if {$tclencoding != {}} {
	fconfigure $fd -encoding $tclencoding
    }
    fileevent $fd readable [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 nextupdate
    global leftover commfd
    global displayorder commitidx commitrow commitdata
    global parentlist childlist children curview hlview
    global vparentlist vchildlist vdisporder vcmitlisted

    set stuff [read $fd]
    if {$stuff == {}} {
	if {![eof $fd]} return
	global viewname
	unset commfd($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} {
	    after idle finishcommits
	}
	return
    }
    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} {
	    set ids [string range $cmit 0 [expr {$j - 1}]]
	    if {[string range $ids 0 0] == "-"} {
		set listed 0
		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 $shortcmit 0 80]..."
	    }
	    error_popup "Can't parse git rev-list output: {$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 childlist $children($view,$id)
	    lappend displayorder $id
	    lappend commitlisted $listed
	} else {
	    lappend vparentlist($view) $olds
	    lappend vchildlist($view) $children($view,$id)
	    lappend vdisporder($view) $id
	    lappend vcmitlisted($view) $listed
	}
	set gotsome 1
    }
    if {$gotsome} {
	if {$view == $curview} {
	    layoutmore
	} elseif {[info exists hlview] && $view == $hlview} {
	    vhighlightmore
	}
    }
    if {[clock clicks -milliseconds] >= $nextupdate} {
	doupdate
    }
}

proc doupdate {} {
    global commfd nextupdate numcommits ncmupdate

    foreach v [array names commfd] {
	fileevent $commfd($v) 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}]
    }
    foreach v [array names commfd] {
	set fd $commfd($v)
	fileevent $fd readable [list getcommitlines $fd $v]
    }
}

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

    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)}
    discardallcommits
    readrefs
    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 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 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 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 $refd line]]} {
	if {![regexp {^([0-9a-f]{40})	refs/([^^]*)$} $line \
	    match id path]} {
	    continue
	}
	if {[regexp {^remotes/.*/HEAD$} $path match]} {
	    continue
	}
	if {![regexp {^(tags|heads)/(.*)$} $path match type name]} {
	    set type others
	    set name $path
	}
	if {[regexp {^remotes/} $path match]} {
	    set type heads
	}
	if {$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 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 makewindow {} {
    global canv canv2 canv3 linespc charspc ctext cflist
    global textfont mainfont uifont
    global findtype findtypemenu findloc findstring fstring geometry
    global entries sha1entry sha1string sha1but
    global maincursor textcursor curtextcursor
    global rowctxmenu mergemax wrapcomment
    global highlight_files gdttype
    global searchstring sstring

    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 "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

    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
    frame .ctop.top.lbar
    pack .ctop.top.lbar -side bottom -fill x
    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 "scrollcanv $cscroll"
    .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 -font $uifont
    $sha1but conf -disabledforeground [$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 -font $uifont
    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
    trace add variable findstring write find_change
    pack $fstring -side left -expand 1 -fill x
    set findtype Exact
    set findtypemenu [tk_optionMenu .ctop.top.bar.findtype \
			  findtype Exact IgnCase Regexp]
    trace add variable findtype write find_change
    .ctop.top.bar.findtype configure -font $uifont
    .ctop.top.bar.findtype.menu configure -font $uifont
    set findloc "All fields"
    tk_optionMenu .ctop.top.bar.findloc findloc "All fields" Headline \
	Comments Author Committer
    trace add variable findloc write find_change
    .ctop.top.bar.findloc configure -font $uifont
    .ctop.top.bar.findloc.menu configure -font $uifont
    pack .ctop.top.bar.findloc -side right
    pack .ctop.top.bar.findtype -side right

    label .ctop.top.lbar.flabel -text "Highlight:  Commits " \
	-font $uifont
    pack .ctop.top.lbar.flabel -side left -fill y
    set gdttype "touching paths:"
    set gm [tk_optionMenu .ctop.top.lbar.gdttype gdttype "touching paths:" \
		"adding/removing string:"]
    trace add variable gdttype write hfiles_change
    $gm conf -font $uifont
    .ctop.top.lbar.gdttype conf -font $uifont
    pack .ctop.top.lbar.gdttype -side left -fill y
    entry .ctop.top.lbar.fent -width 25 -font $textfont \
	-textvariable highlight_files
    trace add variable highlight_files write hfiles_change
    lappend entries .ctop.top.lbar.fent
    pack .ctop.top.lbar.fent -side left -fill x -expand 1
    label .ctop.top.lbar.vlabel -text " OR in view" -font $uifont
    pack .ctop.top.lbar.vlabel -side left -fill y
    global viewhlmenu selectedhlview
    set viewhlmenu [tk_optionMenu .ctop.top.lbar.vhl selectedhlview None]
    $viewhlmenu entryconf 0 -command delvhighlight
    $viewhlmenu conf -font $uifont
    .ctop.top.lbar.vhl conf -font $uifont
    pack .ctop.top.lbar.vhl -side left -fill y
    label .ctop.top.lbar.rlabel -text " OR " -font $uifont
    pack .ctop.top.lbar.rlabel -side left -fill y
    global highlight_related
    set m [tk_optionMenu .ctop.top.lbar.relm highlight_related None \
	       "Descendent" "Not descendent" "Ancestor" "Not ancestor"]
    $m conf -font $uifont
    .ctop.top.lbar.relm conf -font $uifont
    trace add variable highlight_related write vrel_change
    pack .ctop.top.lbar.relm -side left -fill y

    panedwindow .ctop.cdet -orient horizontal
    .ctop add .ctop.cdet
    frame .ctop.cdet.left
    frame .ctop.cdet.left.bot
    pack .ctop.cdet.left.bot -side bottom -fill x
    button .ctop.cdet.left.bot.search -text "Search" -command dosearch \
	-font $uifont
    pack .ctop.cdet.left.bot.search -side left -padx 5
    set sstring .ctop.cdet.left.bot.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
    set ctext .ctop.cdet.left.ctext
    text $ctext -bg white -state disabled -font $textfont \
	-width $geometry(ctextw) -height $geometry(ctexth) \
	-yscrollcommand scrolltext -wrap none
    scrollbar .ctop.cdet.left.sb -command "$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 comment -wrap $wrapcomment
    $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 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

    frame .ctop.cdet.right
    frame .ctop.cdet.right.mode
    radiobutton .ctop.cdet.right.mode.patch -text "Patch" \
	-command reselectline -variable cmitmode -value "patch"
    radiobutton .ctop.cdet.right.mode.tree -text "Tree" \
	-command reselectline -variable cmitmode -value "tree"
    grid .ctop.cdet.right.mode.patch .ctop.cdet.right.mode.tree -sticky ew
    pack .ctop.cdet.right.mode -side top -fill x
    set cflist .ctop.cdet.right.cfiles
    set indent [font measure $mainfont "nn"]
    text $cflist -width $geometry(cflistw) -background white -font $mainfont \
	-tabs [list $indent [expr {2 * $indent}]] \
	-yscrollcommand ".ctop.cdet.right.sb set" \
	-cursor [. cget -cursor] \
	-spacing1 1 -spacing3 1
    scrollbar .ctop.cdet.right.sb -command "$cflist yview"
    pack .ctop.cdet.right.sb -side right -fill y
    pack $cflist -side left -fill both -expand 1
    $cflist tag configure highlight \
	-background [$cflist cget -selectbackground]
    $cflist tag configure bold -font [concat $mainfont bold]
    .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> "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 . <Control-Home> "allcanvs yview moveto 0.0"
    bind . <Control-End> "allcanvs yview moveto 1.0"
    bind . <Control-Key-Up> "allcanvs yview scroll -1 units"
    bind . <Control-Key-Down> "allcanvs yview scroll 1 units"
    bind . <Control-Key-Prior> "allcanvs yview scroll -1 pages"
    bind . <Control-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> dosearchback
    bind . <Control-s> dosearch
    bind . <Control-equal> {incrfont 1}
    bind . <Control-KP_Add> {incrfont 1}
    bind . <Control-minus> {incrfont -1}
    bind . <Control-KP_Subtract> {incrfont -1}
    bind . <Destroy> {savestuff %W}
    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}

    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
}

# 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 entries
    foreach e $entries {
	if {$w == $e} return
    }
    focus .
}

proc savestuff {w} {
    global canv canv2 canv3 ctext cflist mainfont textfont uifont
    global stuffsaved findmergefiles maxgraphpct
    global maxwidth showneartags
    global viewname viewfiles viewargs viewperm nextviewnum
    global cmitmode wrapcomment

    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 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 "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"
	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 {} {
    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

Copyright © 2005-2006 Paul Mackerras

Use and redistribute under the terms of the GNU General Public License} \
	    -justify center -aspect 400
    pack $w.m -side top -fill x -padx 20 -pady 20
    button $w.ok -text Close -command "destroy $w"
    pack $w.ok -side bottom
}

proc keys {} {
    set w .keys
    if {[winfo exists $w]} {
	raise $w
	return
    }
    toplevel $w
    wm title $w "Gitk key bindings"
    message $w.m -text {
Gitk key bindings:

<Ctrl-Q>		Quit
<Home>		Move to first commit
<End>		Move to last commit
<Up>, p, i	Move up one commit
<Down>, n, k	Move down one commit
<Left>, z, j	Go back in history list
<Right>, x, l	Go forward in history list
<PageUp>	Move up one page in commit list
<PageDown>	Move down one page in commit list
<Ctrl-Home>	Scroll to top of commit list
<Ctrl-End>	Scroll to bottom of commit list
<Ctrl-Up>	Scroll commit list up one line
<Ctrl-Down>	Scroll commit list down one line
<Ctrl-PageUp>	Scroll commit list up one page
<Ctrl-PageDown>	Scroll commit list down one page
<Shift-Up>	Move to previous highlighted line
<Shift-Down>	Move to next highlighted line
<Delete>, b	Scroll diff view up one page
<Backspace>	Scroll diff view up one page
<Space>		Scroll diff view down one page
u		Scroll diff view up 18 lines
d		Scroll diff view down 18 lines
<Ctrl-F>		Find
<Ctrl-G>		Move to next find hit
<Return>	Move to next find hit
/		Move to next find hit, or redo find
?		Move to previous find hit
f		Scroll diff view to next file
<Ctrl-S>		Search for next hit in diff view
<Ctrl-R>		Search for previous hit in diff view
<Ctrl-KP+>	Increase font size
<Ctrl-plus>	Increase font size
<Ctrl-KP->	Decrease font size
<Ctrl-minus>	Decrease font size
} \
	    -justify left -bg white -border 2 -relief sunken
    pack $w.m -side top -fill both
    button $w.ok -text Close -command "destroy $w"
    pack $w.ok -side bottom
}

# Procedures for manipulating the file list window at the
# bottom right of the overall window.

proc treeview {w l openlevs} {
    global treecontents treediropen treeheight treeparent treeindex

    set ix 0
    set treeindex() 0
    set lev 0
    set prefix {}
    set prefixend -1
    set prefendstack {}
    set htstack {}
    set ht 0
    set treecontents() {}
    $w conf -state normal
    foreach f $l {
	while {[string range $f 0 $prefixend] ne $prefix} {
	    if {$lev <= $openlevs} {
		$w mark set e:$treeindex($prefix) "end -1c"
		$w mark gravity e:$treeindex($prefix) left
	    }
	    set treeheight($prefix) $ht
	    incr ht [lindex $htstack end]
	    set htstack [lreplace $htstack end end]
	    set prefixend [lindex $prefendstack end]
	    set prefendstack [lreplace $prefendstack end end]
	    set prefix [string range $prefix 0 $prefixend]
	    incr lev -1
	}
	set tail [string range $f [expr {$prefixend+1}] end]
	while {[set slash [string first "/" $tail]] >= 0} {
	    lappend htstack $ht
	    set ht 0
	    lappend prefendstack $prefixend
	    incr prefixend [expr {$slash + 1}]
	    set d [string range $tail 0 $slash]
	    lappend treecontents($prefix) $d
	    set oldprefix $prefix
	    append prefix $d
	    set treecontents($prefix) {}
	    set treeindex($prefix) [incr ix]
	    set treeparent($prefix) $oldprefix
	    set tail [string range $tail [expr {$slash+1}] end]
	    if {$lev <= $openlevs} {
		set ht 1
		set treediropen($prefix) [expr {$lev < $openlevs}]
		set bm [expr {$lev == $openlevs? "tri-rt": "tri-dn"}]
		$w mark set d:$ix "end -1c"
		$w mark gravity d:$ix left
		set str "\n"
		for {set i 0} {$i < $lev} {incr i} {append str "\t"}
		$w insert end $str
		$w image create end -align center -image $bm -padx 1 \
		    -name a:$ix
		$w insert end $d [highlight_tag $prefix]
		$w mark set s:$ix "end -1c"
		$w mark gravity s:$ix left
	    }
	    incr lev
	}
	if {$tail ne {}} {
	    if {$lev <= $openlevs} {
		incr ht
		set str "\n"
		for {set i 0} {$i < $lev} {incr i} {append str "\t"}
		$w insert end $str
		$w insert end $tail [highlight_tag $f]
	    }
	    lappend treecontents($prefix) $tail
	}
    }
    while {$htstack ne {}} {
	set treeheight($prefix) $ht
	incr ht [lindex $htstack end]
	set htstack [lreplace $htstack end end]
    }
    $w conf -state disabled
}

proc linetoelt {l} {
    global treeheight treecontents

    set y 2
    set prefix {}
    while {1} {
	foreach e $treecontents($prefix) {
	    if {$y == $l} {
		return "$prefix$e"
	    }
	    set n 1
	    if {[string index $e end] eq "/"} {
		set n $treeheight($prefix$e)
		if {$y + $n > $l} {
		    append prefix $e
		    incr y
		    break
		}
	    }
	    incr y $n
	}
    }
}

proc highlight_tree {y prefix} {
    global treeheight treecontents cflist

    foreach e $treecontents($prefix) {
	set path $prefix$e
	if {[highlight_tag $path] ne {}} {
	    $cflist tag add bold $y.0 "$y.0 lineend"
	}
	incr y
	if {[string index $e end] eq "/" && $treeheight($path) > 1} {
	    set y [highlight_tree $y $path]
	}
    }
    return $y
}

proc treeclosedir {w dir} {
    global treediropen treeheight treeparent treeindex

    set ix $treeindex($dir)
    $w conf -state normal
    $w delete s:$ix e:$ix
    set treediropen($dir) 0
    $w image configure a:$ix -image tri-rt
    $w conf -state disabled
    set n [expr {1 - $treeheight($dir)}]
    while {$dir ne {}} {
	incr treeheight($dir) $n
	set dir $treeparent($dir)
    }
}

proc treeopendir {w dir} {
    global treediropen treeheight treeparent treecontents treeindex

    set ix $treeindex($dir)
    $w conf -state normal
    $w image configure a:$ix -image tri-dn
    $w mark set e:$ix s:$ix
    $w mark gravity e:$ix right
    set lev 0
    set str "\n"
    set n [llength $treecontents($dir)]
    for {set x $dir} {$x ne {}} {set x $treeparent($x)} {
	incr lev
	append str "\t"
	incr treeheight($x) $n
    }
    foreach e $treecontents($dir) {
	set de $dir$e
	if {[string index $e end] eq "/"} {
	    set iy $treeindex($de)
	    $w mark set d:$iy e:$ix
	    $w mark gravity d:$iy left
	    $w insert e:$ix $str
	    set treediropen($de) 0
	    $w image create e:$ix -align center -image tri-rt -padx 1 \
		-name a:$iy
	    $w insert e:$ix $e [highlight_tag $de]
	    $w mark set s:$iy e:$ix
	    $w mark gravity s:$iy left
	    set treeheight($de) 1
	} else {
	    $w insert e:$ix $str
	    $w insert e:$ix $e [highlight_tag $de]
	}
    }
    $w mark gravity e:$ix left
    $w conf -state disabled
    set treediropen($dir) 1
    set top [lindex [split [$w index @0,0] .] 0]
    set ht [$w cget -height]
    set l [lindex [split [$w index s:$ix] .] 0]
    if {$l < $top} {
	$w yview $l.0
    } elseif {$l + $n + 1 > $top + $ht} {
	set top [expr {$l + $n + 2 - $ht}]
	if {$l < $top} {
	    set top $l
	}
	$w yview $top.0
    }
}

proc treeclick {w x y} {
    global treediropen cmitmode ctext cflist cflist_top

    if {$cmitmode ne "tree"} return
    if {![info exists cflist_top]} return
    set l [lindex [split [$w index "@$x,$y"] "."] 0]
    $cflist tag remove highlight $cflist_top.0 "$cflist_top.0 lineend"
    $cflist tag add highlight $l.0 "$l.0 lineend"
    set cflist_top $l
    if {$l == 1} {
	$ctext yview 1.0
	return
    }
    set e [linetoelt $l]
    if {[string index $e end] ne "/"} {
	showfile $e
    } elseif {$treediropen($e)} {
	treeclosedir $w $e
    } else {
	treeopendir $w $e
    }
}

proc setfilelist {id} {
    global treefilelist cflist

    treeview $cflist $treefilelist($id) 0
}

image create bitmap tri-rt -background black -foreground blue -data {
    #define tri-rt_width 13
    #define tri-rt_height 13
    static unsigned char tri-rt_bits[] = {
       0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x30, 0x00, 0x70, 0x00, 0xf0, 0x00,
       0xf0, 0x01, 0xf0, 0x00, 0x70, 0x00, 0x30, 0x00, 0x10, 0x00, 0x00, 0x00,
       0x00, 0x00};
} -maskdata {
    #define tri-rt-mask_width 13
    #define tri-rt-mask_height 13
    static unsigned char tri-rt-mask_bits[] = {
       0x08, 0x00, 0x18, 0x00, 0x38, 0x00, 0x78, 0x00, 0xf8, 0x00, 0xf8, 0x01,
       0xf8, 0x03, 0xf8, 0x01, 0xf8, 0x00, 0x78, 0x00, 0x38, 0x00, 0x18, 0x00,
       0x08, 0x00};
}
image create bitmap tri-dn -background black -foreground blue -data {
    #define tri-dn_width 13
    #define tri-dn_height 13
    static unsigned char tri-dn_bits[] = {
       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfc, 0x07, 0xf8, 0x03,
       0xf0, 0x01, 0xe0, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
       0x00, 0x00};
} -maskdata {
    #define tri-dn-mask_width 13
    #define tri-dn-mask_height 13
    static unsigned char tri-dn-mask_bits[] = {
       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x1f, 0xfe, 0x0f, 0xfc, 0x07,
       0xf8, 0x03, 0xf0, 0x01, 0xe0, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00,
       0x00, 0x00};
}

proc init_flist {first} {
    global cflist cflist_top selectedline difffilestart

    $cflist conf -state normal
    $cflist delete 0.0 end
    if {$first ne {}} {
	$cflist insert end $first
	set cflist_top 1
	$cflist tag add highlight 1.0 "1.0 lineend"
    } else {
	catch {unset cflist_top}
    }
    $cflist conf -state disabled
    set difffilestart {}
}

proc highlight_tag {f} {
    global highlight_paths

    foreach p $highlight_paths {
	if {[string match $p $f]} {
	    return "bold"
	}
    }
    return {}
}

proc highlight_filelist {} {
    global cmitmode cflist

    $cflist conf -state normal
    if {$cmitmode ne "tree"} {
	set end [lindex [split [$cflist index end] .] 0]
	for {set l 2} {$l < $end} {incr l} {
	    set line [$cflist get $l.0 "$l.0 lineend"]
	    if {[highlight_tag $line] ne {}} {
		$cflist tag add bold $l.0 "$l.0 lineend"
	    }
	}
    } else {
	highlight_tree 2 {}
    }
    $cflist conf -state disabled
}

proc unhighlight_filelist {} {
    global cflist

    $cflist conf -state normal
    $cflist tag remove bold 1.0 end
    $cflist conf -state disabled
}

proc add_flist {fl} {
    global cflist

    $cflist conf -state normal
    foreach f $fl {
	$cflist insert end "\n"
	$cflist insert end $f [highlight_tag $f]
    }
    $cflist conf -state disabled
}

proc sel_flist {w x y} {
    global ctext difffilestart cflist cflist_top cmitmode

    if {$cmitmode eq "tree"} return
    if {![info exists cflist_top]} return
    set l [lindex [split [$w index "@$x,$y"] "."] 0]
    $cflist tag remove highlight $cflist_top.0 "$cflist_top.0 lineend"
    $cflist tag add highlight $l.0 "$l.0 lineend"
    set cflist_top $l
    if {$l == 1} {
	$ctext yview 1.0
    } else {
	catch {$ctext yview [lindex $difffilestart [expr {$l - 2}]]}
    }
}

# Functions for adding and removing shell-type quoting

proc shellquote {str} {
    if {![string match "*\['\"\\ \t]*" $str]} {
	return $str
    }
    if {![string match "*\['\"\\]*" $str]} {
	return "\"$str\""
    }
    if {![string match "*'*" $str]} {
	return "'$str'"
    }
    return "\"[string map {\" \\\" \\ \\\\} $str]\""
}

proc shellarglist {l} {
    set str {}
    foreach a $l {
	if {$str ne {}} {
	    append str " "
	}
	append str [shellquote $a]
    }
    return $str
}

proc shelldequote {str} {
    set ret {}
    set used -1
    while {1} {
	incr used
	if {![regexp -start $used -indices "\['\"\\\\ \t]" $str first]} {
	    append ret [string range $str $used end]
	    set used [string length $str]
	    break
	}
	set first [lindex $first 0]
	set ch [string index $str $first]
	if {$first > $used} {
	    append ret [string range $str $used [expr {$first - 1}]]
	    set used $first
	}
	if {$ch eq " " || $ch eq "\t"} break
	incr used
	if {$ch eq "'"} {
	    set first [string first "'" $str $used]
	    if {$first < 0} {
		error "unmatched single-quote"
	    }
	    append ret [string range $str $used [expr {$first - 1}]]
	    set used $first
	    continue
	}
	if {$ch eq "\\"} {
	    if {$used >= [string length $str]} {
		error "trailing backslash"
	    }
	    append ret [string index $str $used]
	    continue
	}
	# here ch == "\""
	while {1} {
	    if {![regexp -start $used -indices "\[\"\\\\]" $str first]} {
		error "unmatched double-quote"
	    }
	    set first [lindex $first 0]
	    set ch [string index $str $first]
	    if {$first > $used} {
		append ret [string range $str $used [expr {$first - 1}]]
		set used $first
	    }
	    if {$ch eq "\""} break
	    incr used
	    append ret [string index $str $used]
	    incr used
	}
    }
    return [list $used $ret]
}

proc shellsplit {str} {
    set l {}
    while {1} {
	set str [string trimleft $str]
	if {$str eq {}} break
	set dq [shelldequote $str]
	set n [lindex $dq 0]
	set word [lindex $dq 1]
	set str [string range $str $n end]
	lappend l $word
    }
    return $l
}

# Code to implement multiple views

proc newview {ishighlight} {
    global nextviewnum newviewname newviewperm uifont newishighlight
    global newviewargs revtreeargs

    set newishighlight $ishighlight
    set top .gitkview
    if {[winfo exists $top]} {
	raise $top
	return
    }
    set newviewname($nextviewnum) "View $nextviewnum"
    set newviewperm($nextviewnum) 0
    set newviewargs($nextviewnum) [shellarglist $revtreeargs]
    vieweditor $top $nextviewnum "Gitk view definition" 
}

proc editview {} {
    global curview
    global viewname viewperm newviewname newviewperm
    global viewargs newviewargs

    set top .gitkvedit-$curview
    if {[winfo exists $top]} {
	raise $top
	return
    }
    set newviewname($curview) $viewname($curview)
    set newviewperm($curview) $viewperm($curview)
    set newviewargs($curview) [shellarglist $viewargs($curview)]
    vieweditor $top $curview "Gitk: edit view $viewname($curview)"
}

proc vieweditor {top n title} {
    global newviewname newviewperm viewfiles
    global uifont

    toplevel $top
    wm title $top $title
    label $top.nl -text "Name" -font $uifont
    entry $top.name -width 20 -textvariable newviewname($n)
    grid $top.nl $top.name -sticky w -pady 5
    checkbutton $top.perm -text "Remember this view" -variable newviewperm($n)
    grid $top.perm - -pady 5 -sticky w
    message $top.al -aspect 1000 -font $uifont \
	-text "Commits to include (arguments to git rev-list):"
    grid $top.al - -sticky w -pady 5
    entry $top.args -width 50 -textvariable newviewargs($n) \
	-background white
    grid $top.args - -sticky ew -padx 5
    message $top.l -aspect 1000 -font $uifont \
	-text "Enter files and directories to include, one per line:"
    grid $top.l - -sticky w
    text $top.t -width 40 -height 10 -background white
    if {[info exists viewfiles($n)]} {
	foreach f $viewfiles($n) {
	    $top.t insert end $f
	    $top.t insert end "\n"
	}
	$top.t delete {end - 1c} end
	$top.t mark set insert 0.0
    }
    grid $top.t - -sticky ew -padx 5
    frame $top.buts
    button $top.buts.ok -text "OK" -command [list newviewok $top $n]
    button $top.buts.can -text "Cancel" -command [list destroy $top]
    grid $top.buts.ok $top.buts.can
    grid columnconfigure $top.buts 0 -weight 1 -uniform a
    grid columnconfigure $top.buts 1 -weight 1 -uniform a
    grid $top.buts - -pady 10 -sticky ew
    focus $top.t
}

proc doviewmenu {m first cmd op argv} {
    set nmenu [$m index end]
    for {set i $first} {$i <= $nmenu} {incr i} {
	if {[$m entrycget $i -command] eq $cmd} {
	    eval $m $op $i $argv
	    break
	}
    }
}

proc allviewmenus {n op args} {
    global viewhlmenu

    doviewmenu .bar.view 7 [list showview $n] $op $args
    doviewmenu $viewhlmenu 1 [list addvhighlight $n] $op $args
}

proc newviewok {top n} {
    global nextviewnum newviewperm newviewname newishighlight
    global viewname viewfiles viewperm selectedview curview
    global viewargs newviewargs viewhlmenu

    if {[catch {
	set newargs [shellsplit $newviewargs($n)]
    } err]} {
	error_popup "Error in commit selection arguments: $err"
	wm raise $top
	focus $top
	return
    }
    set files {}
    foreach f [split [$top.t get 0.0 end] "\n"] {
	set ft [string trim $f]
	if {$ft ne {}} {
	    lappend files $ft
	}
    }
    if {![info exists viewfiles($n)]} {
	# creating a new view
	incr nextviewnum
	set viewname($n) $newviewname($n)
	set viewperm($n) $newviewperm($n)
	set viewfiles($n) $files
	set viewargs($n) $newargs
	addviewmenu $n
	if {!$newishighlight} {
	    after idle showview $n
	} else {
	    after idle addvhighlight $n
	}
    } else {
	# editing an existing view
	set viewperm($n) $newviewperm($n)
	if {$newviewname($n) ne $viewname($n)} {
	    set viewname($n) $newviewname($n)
	    doviewmenu .bar.view 7 [list showview $n] \
		entryconf [list -label $viewname($n)]
	    doviewmenu $viewhlmenu 1 [list addvhighlight $n] \
		entryconf [list -label $viewname($n) -value $viewname($n)]
	}
	if {$files ne $viewfiles($n) || $newargs ne $viewargs($n)} {
	    set viewfiles($n) $files
	    set viewargs($n) $newargs
	    if {$curview == $n} {
		after idle updatecommits
	    }
	}
    }
    catch {destroy $top}
}

proc delview {} {
    global curview viewdata viewperm hlview selectedhlview

    if {$curview == 0} return
    if {[info exists hlview] && $hlview == $curview} {
	set selectedhlview None
	unset hlview
    }
    allviewmenus $curview delete
    set viewdata($curview) {}
    set viewperm($curview) 0
    showview 0
}

proc addviewmenu {n} {
    global viewname viewhlmenu

    .bar.view add radiobutton -label $viewname($n) \
	-command [list showview $n] -variable selectedview -value $n
    $viewhlmenu add radiobutton -label $viewname($n) \
	-command [list addvhighlight $n] -variable selectedhlview
}

proc flatten {var} {
    global $var

    set ret {}
    foreach i [array names $var] {
	lappend ret $i [set $var\($i\)]
    }
    return $ret
}

proc unflatten {var l} {
    global $var

    catch {unset $var}
    foreach {i v} $l {
	set $var\($i\) $v
    }
}

proc showview {n} {
    global curview viewdata viewfiles
    global displayorder parentlist childlist rowidlist rowoffsets
    global colormap rowtextx commitrow nextcolor canvxmax
    global numcommits rowrangelist commitlisted idrowranges
    global selectedline currentid canv canvy0
    global matchinglines treediffs
    global pending_select phase
    global commitidx rowlaidout rowoptim linesegends
    global commfd nextupdate
    global selectedview
    global vparentlist vchildlist vdisporder vcmitlisted
    global hlview selectedhlview

    if {$n == $curview} return
    set selid {}
    if {[info exists selectedline]} {
	set selid $currentid
	set y [yc $selectedline]
	set ymax [lindex [$canv cget -scrollregion] 3]
	set span [$canv yview]
	set ytop [expr {[lindex $span 0] * $ymax}]
	set ybot [expr {[lindex $span 1] * $ymax}]
	if {$ytop < $y && $y < $ybot} {
	    set yscreen [expr {$y - $ytop}]
	} else {
	    set yscreen [expr {($ybot - $ytop) / 2}]
	}
    }
    unselectline
    normalline
    stopfindproc
    if {$curview >= 0} {
	set vparentlist($curview) $parentlist
	set vchildlist($curview) $childlist
	set vdisporder($curview) $displayorder
	set vcmitlisted($curview) $commitlisted
	if {$phase ne {}} {
	    set viewdata($curview) \
		[list $phase $rowidlist $rowoffsets $rowrangelist \
		     [flatten idrowranges] [flatten idinlist] \
		     $rowlaidout $rowoptim $numcommits $linesegends]
	} elseif {![info exists viewdata($curview)]
		  || [lindex $viewdata($curview) 0] ne {}} {
	    set viewdata($curview) \
		[list {} $rowidlist $rowoffsets $rowrangelist]
	}
    }
    catch {unset matchinglines}
    catch {unset treediffs}
    clear_display
    if {[info exists hlview] && $hlview == $n} {
	unset hlview
	set selectedhlview None
    }

    set curview $n
    set selectedview $n
    .bar.view entryconf 2 -state [expr {$n == 0? "disabled": "normal"}]
    .bar.view entryconf 3 -state [expr {$n == 0? "disabled": "normal"}]

    if {![info exists viewdata($n)]} {
	set pending_select $selid
	getcommits
	return
    }

    set v $viewdata($n)
    set phase [lindex $v 0]
    set displayorder $vdisporder($n)
    set parentlist $vparentlist($n)
    set childlist $vchildlist($n)
    set commitlisted $vcmitlisted($n)
    set rowidlist [lindex $v 1]
    set rowoffsets [lindex $v 2]
    set rowrangelist [lindex $v 3]
    if {$phase eq {}} {
	set numcommits [llength $displayorder]
	catch {unset idrowranges}
    } else {
	unflatten idrowranges [lindex $v 4]
	unflatten idinlist [lindex $v 5]
	set rowlaidout [lindex $v 6]
	set rowoptim [lindex $v 7]
	set numcommits [lindex $v 8]
	set linesegends [lindex $v 9]
    }

    catch {unset colormap}
    catch {unset rowtextx}
    set nextcolor 0
    set canvxmax [$canv cget -width]
    set curview $n
    set row 0
    setcanvscroll
    set yf 0
    set row 0
    if {$selid ne {} && [info exists commitrow($n,$selid)]} {
	set row $commitrow($n,$selid)
	# try to get the selected row in the same position on the screen
	set ymax [lindex [$canv cget -scrollregion] 3]
	set ytop [expr {[yc $row] - $yscreen}]
	if {$ytop < 0} {
	    set ytop 0
	}
	set yf [expr {$ytop * 1.0 / $ymax}]
    }
    allcanvs yview moveto $yf
    drawvisible
    selectline $row 0
    if {$phase ne {}} {
	if {$phase eq "getcommits"} {
	    show_status "Reading commits..."
	}
	if {[info exists commfd($n)]} {
	    layoutmore
	} else {
	    finishcommits
	}
    } elseif {$numcommits == 0} {
	show_status "No commits selected"
    }
}

# Stuff relating to the highlighting facility

proc ishighlighted {row} {
    global vhighlights fhighlights nhighlights rhighlights

    if {[info exists nhighlights($row)] && $nhighlights($row) > 0} {
	return $nhighlights($row)
    }
    if {[info exists vhighlights($row)] && $vhighlights($row) > 0} {
	return $vhighlights($row)
    }
    if {[info exists fhighlights($row)] && $fhighlights($row) > 0} {
	return $fhighlights($row)
    }
    if {[info exists rhighlights($row)] && $rhighlights($row) > 0} {
	return $rhighlights($row)
    }
    return 0
}

proc bolden {row font} {
    global canv linehtag selectedline boldrows

    lappend boldrows $row
    $canv itemconf $linehtag($row) -font $font
    if {[info exists selectedline] && $row == $selectedline} {
	$canv delete secsel
	set t [eval $canv create rect [$canv bbox $linehtag($row)] \
		   -outline {{}} -tags secsel \
		   -fill [$canv cget -selectbackground]]
	$canv lower $t
    }
}

proc bolden_name {row font} {
    global canv2 linentag selectedline boldnamerows

    lappend boldnamerows $row
    $canv2 itemconf $linentag($row) -font $font
    if {[info exists selectedline] && $row == $selectedline} {
	$canv2 delete secsel
	set t [eval $canv2 create rect [$canv2 bbox $linentag($row)] \
		   -outline {{}} -tags secsel \
		   -fill [$canv2 cget -selectbackground]]
	$canv2 lower $t
    }
}

proc unbolden {} {
    global mainfont boldrows

    set stillbold {}
    foreach row $boldrows {
	if {![ishighlighted $row]} {
	    bolden $row $mainfont
	} else {
	    lappend stillbold $row
	}
    }
    set boldrows $stillbold
}

proc addvhighlight {n} {
    global hlview curview viewdata vhl_done vhighlights commitidx

    if {[info exists hlview]} {
	delvhighlight
    }
    set hlview $n
    if {$n != $curview && ![info exists viewdata($n)]} {
	set viewdata($n) [list getcommits {{}} {{}} {} {} {} 0 0 0 {}]
	set vparentlist($n) {}
	set vchildlist($n) {}
	set vdisporder($n) {}
	set vcmitlisted($n) {}
	start_rev_list $n
    }
    set vhl_done $commitidx($hlview)
    if {$vhl_done > 0} {
	drawvisible
    }
}

proc delvhighlight {} {
    global hlview vhighlights

    if {![info exists hlview]} return
    unset hlview
    catch {unset vhighlights}
    unbolden
}

proc vhighlightmore {} {
    global hlview vhl_done commitidx vhighlights
    global displayorder vdisporder curview mainfont

    set font [concat $mainfont bold]
    set max $commitidx($hlview)
    if {$hlview == $curview} {
	set disp $displayorder
    } else {
	set disp $vdisporder($hlview)
    }
    set vr [visiblerows]
    set r0 [lindex $vr 0]
    set r1 [lindex $vr 1]
    for {set i $vhl_done} {$i < $max} {incr i} {
	set id [lindex $disp $i]
	if {[info exists commitrow($curview,$id)]} {
	    set row $commitrow($curview,$id)
	    if {$r0 <= $row && $row <= $r1} {
		if {![highlighted $row]} {
		    bolden $row $font
		}
		set vhighlights($row) 1
	    }
	}
    }
    set vhl_done $max
}

proc askvhighlight {row id} {
    global hlview vhighlights commitrow iddrawn mainfont

    if {[info exists commitrow($hlview,$id)]} {
	if {[info exists iddrawn($id)] && ![ishighlighted $row]} {
	    bolden $row [concat $mainfont bold]
	}
	set vhighlights($row) 1
    } else {
	set vhighlights($row) 0
    }
}

proc hfiles_change {name ix op} {
    global highlight_files filehighlight fhighlights fh_serial
    global mainfont highlight_paths

    if {[info exists filehighlight]} {
	# delete previous highlights
	catch {close $filehighlight}
	unset filehighlight
	catch {unset fhighlights}
	unbolden
	unhighlight_filelist
    }
    set highlight_paths {}
    after cancel do_file_hl $fh_serial
    incr fh_serial
    if {$highlight_files ne {}} {
	after 300 do_file_hl $fh_serial
    }
}

proc makepatterns {l} {
    set ret {}
    foreach e $l {
	set ee [string map {"*" "\\*" "?" "\\?" "\[" "\\\[" "\\" "\\\\"} $e]
	if {[string index $ee end] eq "/"} {
	    lappend ret "$ee*"
	} else {
	    lappend ret $ee
	    lappend ret "$ee/*"
	}
    }
    return $ret
}

proc do_file_hl {serial} {
    global highlight_files filehighlight highlight_paths gdttype fhl_list

    if {$gdttype eq "touching paths:"} {
	if {[catch {set paths [shellsplit $highlight_files]}]} return
	set highlight_paths [makepatterns $paths]
	highlight_filelist
	set gdtargs [concat -- $paths]
    } else {
	set gdtargs [list "-S$highlight_files"]
    }
    set cmd [concat | git-diff-tree -r -s --stdin $gdtargs]
    set filehighlight [open $cmd r+]
    fconfigure $filehighlight -blocking 0
    fileevent $filehighlight readable readfhighlight
    set fhl_list {}
    drawvisible
    flushhighlights
}

proc flushhighlights {} {
    global filehighlight fhl_list

    if {[info exists filehighlight]} {
	lappend fhl_list {}
	puts $filehighlight ""
	flush $filehighlight
    }
}

proc askfilehighlight {row id} {
    global filehighlight fhighlights fhl_list

    lappend fhl_list $id
    set fhighlights($row) -1
    puts $filehighlight $id
}

proc readfhighlight {} {
    global filehighlight fhighlights commitrow curview mainfont iddrawn
    global fhl_list

    while {[gets $filehighlight line] >= 0} {
	set line [string trim $line]
	set i [lsearch -exact $fhl_list $line]
	if {$i < 0} continue
	for {set j 0} {$j < $i} {incr j} {
	    set id [lindex $fhl_list $j]
	    if {[info exists commitrow($curview,$id)]} {
		set fhighlights($commitrow($curview,$id)) 0
	    }
	}
	set fhl_list [lrange $fhl_list [expr {$i+1}] end]
	if {$line eq {}} continue
	if {![info exists commitrow($curview,$line)]} continue
	set row $commitrow($curview,$line)
	if {[info exists iddrawn($line)] && ![ishighlighted $row]} {
	    bolden $row [concat $mainfont bold]
	}
	set fhighlights($row) 1
    }
    if {[eof $filehighlight]} {
	# strange...
	puts "oops, git-diff-tree died"
	catch {close $filehighlight}
	unset filehighlight
    }
    next_hlcont
}

proc find_change {name ix op} {
    global nhighlights mainfont boldnamerows
    global findstring findpattern findtype

    # delete previous highlights, if any
    foreach row $boldnamerows {
	bolden_name $row $mainfont
    }
    set boldnamerows {}
    catch {unset nhighlights}
    unbolden
    if {$findtype ne "Regexp"} {
	set e [string map {"*" "\\*" "?" "\\?" "\[" "\\\[" "\\" "\\\\"} \
		   $findstring]
	set findpattern "*$e*"
    }
    drawvisible
}

proc askfindhighlight {row id} {
    global nhighlights commitinfo iddrawn mainfont
    global findstring findtype findloc findpattern

    if {![info exists commitinfo($id)]} {
	getcommit $id
    }
    set info $commitinfo($id)
    set isbold 0
    set fldtypes {Headline Author Date Committer CDate Comments}
    foreach f $info ty $fldtypes {
	if {$findloc ne "All fields" && $findloc ne $ty} {
	    continue
	}
	if {$findtype eq "Regexp"} {
	    set doesmatch [regexp $findstring $f]
	} elseif {$findtype eq "IgnCase"} {
	    set doesmatch [string match -nocase $findpattern $f]
	} else {
	    set doesmatch [string match $findpattern $f]
	}
	if {$doesmatch} {
	    if {$ty eq "Author"} {
		set isbold 2
	    } else {
		set isbold 1
	    }
	}
    }
    if {[info exists iddrawn($id)]} {
	if {$isbold && ![ishighlighted $row]} {
	    bolden $row [concat $mainfont bold]
	}
	if {$isbold >= 2} {
	    bolden_name $row [concat $mainfont bold]
	}
    }
    set nhighlights($row) $isbold
}

proc vrel_change {name ix op} {
    global highlight_related

    rhighlight_none
    if {$highlight_related ne "None"} {
	after idle drawvisible
    }
}

# prepare for testing whether commits are descendents or ancestors of a
proc rhighlight_sel {a} {
    global descendent desc_todo ancestor anc_todo
    global highlight_related rhighlights

    catch {unset descendent}
    set desc_todo [list $a]
    catch {unset ancestor}
    set anc_todo [list $a]
    if {$highlight_related ne "None"} {
	rhighlight_none
	after idle drawvisible
    }
}

proc rhighlight_none {} {
    global rhighlights

    catch {unset rhighlights}
    unbolden
}

proc is_descendent {a} {
    global curview children commitrow descendent desc_todo

    set v $curview
    set la $commitrow($v,$a)
    set todo $desc_todo
    set leftover {}
    set done 0
    for {set i 0} {$i < [llength $todo]} {incr i} {
	set do [lindex $todo $i]
	if {$commitrow($v,$do) < $la} {
	    lappend leftover $do
	    continue
	}
	foreach nk $children($v,$do) {
	    if {![info exists descendent($nk)]} {
		set descendent($nk) 1
		lappend todo $nk
		if {$nk eq $a} {
		    set done 1
		}
	    }
	}
	if {$done} {
	    set desc_todo [concat $leftover [lrange $todo [expr {$i+1}] end]]
	    return
	}
    }
    set descendent($a) 0
    set desc_todo $leftover
}

proc is_ancestor {a} {
    global curview parentlist commitrow ancestor anc_todo

    set v $curview
    set la $commitrow($v,$a)
    set todo $anc_todo
    set leftover {}
    set done 0
    for {set i 0} {$i < [llength $todo]} {incr i} {
	set do [lindex $todo $i]
	if {![info exists commitrow($v,$do)] || $commitrow($v,$do) > $la} {
	    lappend leftover $do
	    continue
	}
	foreach np [lindex $parentlist $commitrow($v,$do)] {
	    if {![info exists ancestor($np)]} {
		set ancestor($np) 1
		lappend todo $np
		if {$np eq $a} {
		    set done 1
		}
	    }
	}
	if {$done} {
	    set anc_todo [concat $leftover [lrange $todo [expr {$i+1}] end]]
	    return
	}
    }
    set ancestor($a) 0
    set anc_todo $leftover
}

proc askrelhighlight {row id} {
    global descendent highlight_related iddrawn mainfont rhighlights
    global selectedline ancestor

    if {![info exists selectedline]} return
    set isbold 0
    if {$highlight_related eq "Descendent" ||
	$highlight_related eq "Not descendent"} {
	if {![info exists descendent($id)]} {
	    is_descendent $id
	}
	if {$descendent($id) == ($highlight_related eq "Descendent")} {
	    set isbold 1
	}
    } elseif {$highlight_related eq "Ancestor" ||
	      $highlight_related eq "Not ancestor"} {
	if {![info exists ancestor($id)]} {
	    is_ancestor $id
	}
	if {$ancestor($id) == ($highlight_related eq "Ancestor")} {
	    set isbold 1
	}
    }
    if {[info exists iddrawn($id)]} {
	if {$isbold && ![ishighlighted $row]} {
	    bolden $row [concat $mainfont bold]
	}
    }
    set rhighlights($row) $isbold
}

proc next_hlcont {} {
    global fhl_row fhl_dirn displayorder numcommits
    global vhighlights fhighlights nhighlights rhighlights
    global hlview filehighlight findstring highlight_related

    if {![info exists fhl_dirn] || $fhl_dirn == 0} return
    set row $fhl_row
    while {1} {
	if {$row < 0 || $row >= $numcommits} {
	    bell
	    set fhl_dirn 0
	    return
	}
	set id [lindex $displayorder $row]
	if {[info exists hlview]} {
	    if {![info exists vhighlights($row)]} {
		askvhighlight $row $id
	    }
	    if {$vhighlights($row) > 0} break
	}
	if {$findstring ne {}} {
	    if {![info exists nhighlights($row)]} {
		askfindhighlight $row $id
	    }
	    if {$nhighlights($row) > 0} break
	}
	if {$highlight_related ne "None"} {
	    if {![info exists rhighlights($row)]} {
		askrelhighlight $row $id
	    }
	    if {$rhighlights($row) > 0} break
	}
	if {[info exists filehighlight]} {
	    if {![info exists fhighlights($row)]} {
		# ask for a few more while we're at it...
		set r $row
		for {set n 0} {$n < 100} {incr n} {
		    if {![info exists fhighlights($r)]} {
			askfilehighlight $r [lindex $displayorder $r]
		    }
		    incr r $fhl_dirn
		    if {$r < 0 || $r >= $numcommits} break
		}
		flushhighlights
	    }
	    if {$fhighlights($row) < 0} {
		set fhl_row $row
		return
	    }
	    if {$fhighlights($row) > 0} break
	}
	incr row $fhl_dirn
    }
    set fhl_dirn 0
    selectline $row 1
}

proc next_highlight {dirn} {
    global selectedline fhl_row fhl_dirn
    global hlview filehighlight findstring highlight_related

    if {![info exists selectedline]} return
    if {!([info exists hlview] || $findstring ne {} ||
	  $highlight_related ne "None" || [info exists filehighlight])} return
    set fhl_row [expr {$selectedline + $dirn}]
    set fhl_dirn $dirn
    next_hlcont
}

proc cancel_next_highlight {} {
    global fhl_dirn

    set fhl_dirn 0
}

# Graph layout functions

proc shortids {ids} {
    set res {}
    foreach id $ids {
	if {[llength $id] > 1} {
	    lappend res [shortids $id]
	} elseif {[regexp {^[0-9a-f]{40}$} $id]} {
	    lappend res [string range $id 0 7]
	} else {
	    lappend res $id
	}
    }
    return $res
}

proc incrange {l x o} {
    set n [llength $l]
    while {$x < $n} {
	set e [lindex $l $x]
	if {$e ne {}} {
	    lset l $x [expr {$e + $o}]
	}
	incr x
    }
    return $l
}

proc ntimes {n o} {
    set ret {}
    for {} {$n > 0} {incr n -1} {
	lappend ret $o
    }
    return $ret
}

proc usedinrange {id l1 l2} {
    global children commitrow childlist curview

    if {[info exists commitrow($curview,$id)]} {
	set r $commitrow($curview,$id)
	if {$l1 <= $r && $r <= $l2} {
	    return [expr {$r - $l1 + 1}]
	}
	set kids [lindex $childlist $r]
    } else {
	set kids $children($curview,$id)
    }
    foreach c $kids {
	set r $commitrow($curview,$c)
	if {$l1 <= $r && $r <= $l2} {
	    return [expr {$r - $l1 + 1}]
	}
    }
    return 0
}

proc sanity {row {full 0}} {
    global rowidlist rowoffsets

    set col -1
    set ids [lindex $rowidlist $row]
    foreach id $ids {
	incr col
	if {$id eq {}} continue
	if {$col < [llength $ids] - 1 &&
	    [lsearch -exact -start [expr {$col+1}] $ids $id] >= 0} {
	    puts "oops: [shortids $id] repeated in row $row col $col: {[shortids [lindex $rowidlist $row]]}"
	}
	set o [lindex $rowoffsets $row $col]
	set y $row
	set x $col
	while {$o ne {}} {
	    incr y -1
	    incr x $o
	    if {[lindex $rowidlist $y $x] != $id} {
		puts "oops: rowoffsets wrong at row [expr {$y+1}] col [expr {$x-$o}]"
		puts "  id=[shortids $id] check started at row $row"
		for {set i $row} {$i >= $y} {incr i -1} {
		    puts "  row $i ids={[shortids [lindex $rowidlist $i]]} offs={[lindex $rowoffsets $i]}"
		}
		break
	    }
	    if {!$full} break
	    set o [lindex $rowoffsets $y $x]
	}
    }
}

proc makeuparrow {oid x y z} {
    global rowidlist rowoffsets uparrowlen idrowranges

    for {set i 1} {$i < $uparrowlen && $y > 1} {incr i} {
	incr y -1
	incr x $z
	set off0 [lindex $rowoffsets $y]
	for {set x0 $x} {1} {incr x0} {
	    if {$x0 >= [llength $off0]} {
		set x0 [llength [lindex $rowoffsets [expr {$y-1}]]]
		break
	    }
	    set z [lindex $off0 $x0]
	    if {$z ne {}} {
		incr x0 $z
		break
	    }
	}
	set z [expr {$x0 - $x}]
	lset rowidlist $y [linsert [lindex $rowidlist $y] $x $oid]
	lset rowoffsets $y [linsert [lindex $rowoffsets $y] $x $z]
    }
    set tmp [lreplace [lindex $rowoffsets $y] $x $x {}]
    lset rowoffsets $y [incrange $tmp [expr {$x+1}] -1]
    lappend idrowranges($oid) $y
}

proc initlayout {} {
    global rowidlist rowoffsets displayorder commitlisted
    global rowlaidout rowoptim
    global idinlist rowchk rowrangelist idrowranges
    global numcommits canvxmax canv
    global nextcolor
    global parentlist childlist children
    global colormap rowtextx
    global linesegends

    set numcommits 0
    set displayorder {}
    set commitlisted {}
    set parentlist {}
    set childlist {}
    set rowrangelist {}
    set nextcolor 0
    set rowidlist {{}}
    set rowoffsets {{}}
    catch {unset idinlist}
    catch {unset rowchk}
    set rowlaidout 0
    set rowoptim 0
    set canvxmax [$canv cget -width]
    catch {unset colormap}
    catch {unset rowtextx}
    catch {unset idrowranges}
    set linesegends {}
}

proc setcanvscroll {} {
    global canv canv2 canv3 numcommits linespc canvxmax canvy0

    set ymax [expr {$canvy0 + ($numcommits - 0.5) * $linespc + 2}]
    $canv conf -scrollregion [list 0 0 $canvxmax $ymax]
    $canv2 conf -scrollregion [list 0 0 0 $ymax]
    $canv3 conf -scrollregion [list 0 0 0 $ymax]
}

proc visiblerows {} {
    global canv numcommits linespc

    set ymax [lindex [$canv cget -scrollregion] 3]
    if {$ymax eq {} || $ymax == 0} return
    set f [$canv yview]
    set y0 [expr {int([lindex $f 0] * $ymax)}]
    set r0 [expr {int(($y0 - 3) / $linespc) - 1}]
    if {$r0 < 0} {
	set r0 0
    }
    set y1 [expr {int([lindex $f 1] * $ymax)}]
    set r1 [expr {int(($y1 - 3) / $linespc) + 1}]
    if {$r1 >= $numcommits} {
	set r1 [expr {$numcommits - 1}]
    }
    return [list $r0 $r1]
}

proc layoutmore {} {
    global rowlaidout rowoptim commitidx numcommits optim_delay
    global uparrowlen curview

    set row $rowlaidout
    set rowlaidout [layoutrows $row $commitidx($curview) 0]
    set orow [expr {$rowlaidout - $uparrowlen - 1}]
    if {$orow > $rowoptim} {
	optimize_rows $rowoptim 0 $orow
	set rowoptim $orow
    }
    set canshow [expr {$rowoptim - $optim_delay}]
    if {$canshow > $numcommits} {
	showstuff $canshow
    }
}

proc showstuff {canshow} {
    global numcommits commitrow pending_select selectedline
    global linesegends idrowranges idrangedrawn curview

    if {$numcommits == 0} {
	global phase
	set phase "incrdraw"
	allcan