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#!/usr/bin/env wish

# 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.
#
# See hgk.py for extension usage and configuration.


# Modified version of Tip 171:
# http://www.tcl.tk/cgi-bin/tct/tip/171.html
#
# The in_mousewheel global was added to fix strange reentrancy issues.
# The whole snipped is activated only under windows, mouse wheel
# bindings working already under MacOSX and Linux.

if {[catch {package require Ttk}]} {
    # use a shim
    namespace eval ttk {
        proc style args {}

        proc entry args {
            eval [linsert $args 0 ::entry] -relief flat
        }
    }

    interp alias {} ttk::button {} button
    interp alias {} ttk::frame {} frame
    interp alias {} ttk::label {} label
    interp alias {} ttk::scrollbar {} scrollbar
    interp alias {} ttk::optionMenu {} tk_optionMenu

    proc updatepalette {} {}
} else {
    proc ::ttk::optionMenu {w varName firstValue args} {
        upvar #0 $varName var

        if {![info exists var]} {
            set var $firstValue
        }
        ttk::menubutton $w -textvariable $varName -menu $w.menu \
                -direction flush
        menu $w.menu -tearoff 0
        $w.menu add radiobutton -label $firstValue -variable $varName
        foreach i $args {
            $w.menu add radiobutton -label $i -variable $varName
        }
        return $w.menu
    }
    proc updatepalette {} {
        catch {
            tk_setPalette background [ttk::style lookup client -background]
        }
    }
}

if {[tk windowingsystem] eq "win32"} {

ttk::style theme use xpnative

set mw_classes [list Text Listbox Table TreeCtrl]
   foreach class $mw_classes { bind $class <MouseWheel> {} }

set in_mousewheel 0

proc ::tk::MouseWheel {wFired X Y D {shifted 0}} {
    global in_mousewheel
    if { $in_mousewheel != 0 } { return }
    # Set event to check based on call
    set evt "<[expr {$shifted?{Shift-}:{}}]MouseWheel>"
    # do not double-fire in case the class already has a binding
    if {[bind [winfo class $wFired] $evt] ne ""} { return }
    # obtain the window the mouse is over
    set w [winfo containing $X $Y]
    # if we are outside the app, try and scroll the focus widget
    if {![winfo exists $w]} { catch {set w [focus]} }
    if {[winfo exists $w]} {

        if {[bind $w $evt] ne ""} {
            # Awkward ... this widget has a MouseWheel binding, but to
            # trigger successfully in it, we must give it focus.
            catch {focus} old
            if {$w ne $old} { focus $w }
            set in_mousewheel 1
            event generate $w $evt -rootx $X -rooty $Y -delta $D
            set in_mousewheel 0
            if {$w ne $old} { focus $old }
            return
        }

        # aqua and x11/win32 have different delta handling
        if {[tk windowingsystem] ne "aqua"} {
            set delta [expr {- ($D / 30)}]
        } else {
            set delta [expr {- ($D)}]
        }
        # scrollbars have different call conventions
        if {[string match "*Scrollbar" [winfo class $w]]} {
            catch {tk::ScrollByUnits $w \
                       [string index [$w cget -orient] 0] $delta}
        } else {
            set cmd [list $w [expr {$shifted ? "xview" : "yview"}] \
                         scroll $delta units]
            # Walking up to find the proper widget (handles cases like
            # embedded widgets in a canvas)
            while {[catch $cmd] && [winfo toplevel $w] ne $w} {
                set w [winfo parent $w]
            }
        }
    }
}

bind all <MouseWheel> [list ::tk::MouseWheel %W %X %Y %D 0]

# end of win32 section
} else {

if {[catch {
    set theme [ttk::style theme use]
}]} {
    set theme $::ttk::currentTheme
}
if {$theme eq "default"} {
    ttk::style theme use clam
}

}

updatepalette

# Unify right mouse button handling.
# See "mouse buttons on macintosh" thread on comp.lang.tcl
if {[tk windowingsystem] eq "aqua"} {
    event add <<B3>> <Control-ButtonPress-1>
    event add <<B3>> <Button-2>
} else {
    event add <<B3>> <Button-3>
}

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

proc popupify {w} {
    wm resizable $w 0 0
    wm withdraw $w
    update
    set x [expr {([winfo screenwidth .]-[winfo reqwidth $w])/2}]
    set y [expr {([winfo screenheight .]-[winfo reqheight $w])/2}]
    wm geometry  $w +$x+$y
    wm transient $w .
    wm deiconify $w
    wm resizable $w 1 1
}

proc getcommits {rargs} {
    global commits commfd phase canv mainfont env
    global startmsecs nextupdate ncmupdate
    global ctext maincursor textcursor leftover

    # check that we can find a .git directory somewhere...
    set gitdir [gitdir]
    if {![file isdirectory $gitdir]} {
	error_popup "Cannot find the git directory \"$gitdir\"."
	exit 1
    }
    set commits {}
    set phase getcommits
    set startmsecs [clock clicks -milliseconds]
    set nextupdate [expr $startmsecs + 100]
    set ncmupdate 1
    set limit 0
    set revargs {}
    for {set i 0} {$i < [llength $rargs]} {incr i} {
	set opt [lindex $rargs $i]
	if {$opt == "--limit"} {
	    incr i
	    set limit [lindex $rargs $i]
	} else {
	    lappend revargs $opt
	}
    }
    if [catch {
	set parse_args [concat --default HEAD $revargs]
	set parse_temp [eval exec {$env(HG)} --config ui.report_untrusted=false debug-rev-parse $parse_args]
	regsub -all "\r\n" $parse_temp "\n" parse_temp
	set parsed_args [split $parse_temp "\n"]
    } err] {
	# if git-rev-parse failed for some reason...
	if {$rargs == {}} {
	    set revargs HEAD
	}
	set parsed_args $revargs
    }
    if {$limit > 0} {
	set parsed_args [concat -n $limit $parsed_args]
    }
    if [catch {
	set commfd [open "|{$env(HG)} --config ui.report_untrusted=false debug-rev-list --header --topo-order --parents $parsed_args" r]
    } err] {
	puts stderr "Error executing hg debug-rev-list: $err"
	exit 1
    }
    set leftover {}
    fconfigure $commfd -blocking 0 -translation lf -eofchar {}
    fileevent $commfd readable [list getcommitlines $commfd]
    $canv delete all
    $canv create text 3 3 -anchor nw -text "Reading commits..." \
	-font $mainfont -tags textitems
    . config -cursor watch
    settextcursor watch
}

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

    set stuff [read $commfd]
    if {$stuff == {}} {
	if {![eof $commfd]} return
	# set it blocking so we wait for the process to terminate
	fconfigure $commfd -blocking 1
	if {![catch {close $commfd} err]} {
	    after idle finishcommits
	    return
	}
	if {[string range $err 0 4] == "usage"} {
	    set err \
{Gitk: error reading commits: bad arguments to git-rev-list.
(Note: arguments to gitk are passed to git-rev-list
to allow selection of commits to be displayed.)}
	} else {
	    set err "Error reading commits: $err"
	}
	error_popup $err
	exit 1
    }
    set start 0
    while 1 {
	set i [string first "\0" $stuff $start]
	if {$i < 0} {
	    append leftover [string range $stuff $start end]
	    return
	}
	set cmit [string range $stuff $start [expr {$i - 1}]]
	if {$start == 0} {
	    set cmit "$leftover$cmit"
	    set leftover {}
	}
	set start [expr {$i + 1}]
	regsub -all "\r\n" $cmit "\n" cmit
	set j [string first "\n" $cmit]
	set ok 0
	if {$j >= 0} {
	    set ids [string range $cmit 0 [expr {$j - 1}]]
	    set ok 1
	    foreach id $ids {
		if {![regexp {^[0-9a-f]{12}$} $id]} {
		    set ok 0
		    break
		}
	    }
	}
	if {!$ok} {
	    set shortcmit $cmit
	    if {[string length $shortcmit] > 80} {
		set shortcmit "[string range $shortcmit 0 80]..."
	    }
	    error_popup "Can't parse hg debug-rev-list output: {$shortcmit}"
	    exit 1
	}
	set id [lindex $ids 0]
	set olds [lrange $ids 1 end]
	set cmit [string range $cmit [expr {$j + 1}] end]
	lappend commits $id
	set commitlisted($id) 1
	parsecommit $id $cmit 1 [lrange $ids 1 end]
	drawcommit $id
	if {[clock clicks -milliseconds] >= $nextupdate} {
	    doupdate 1
	}
	while {$redisplaying} {
	    set redisplaying 0
	    if {$stopped == 1} {
		set stopped 0
		set phase "getcommits"
		foreach id $commits {
		    drawcommit $id
		    if {$stopped} break
		    if {[clock clicks -milliseconds] >= $nextupdate} {
			doupdate 1
		    }
		}
	    }
	}
    }
}

proc doupdate {reading} {
    global commfd nextupdate numcommits ncmupdate

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

proc readcommit {id} {
    global env
    if [catch {set contents [exec $env(HG) --config ui.report_untrusted=false debug-cat-file commit $id]}] return
    parsecommit $id $contents 0 {}
}

proc parsecommit {id contents listed olds} {
    global commitinfo children nchildren parents nparents cdate ncleft
    global firstparents

    set inhdr 1
    set comment {}
    set headline {}
    set auname {}
    set audate {}
    set comname {}
    set comdate {}
    set rev {}
    set branch {}
    set bookmark {}
    if {![info exists nchildren($id)]} {
	set children($id) {}
	set nchildren($id) 0
	set ncleft($id) 0
    }
    set parents($id) $olds
    set nparents($id) [llength $olds]
    foreach p $olds {
	if {![info exists nchildren($p)]} {
	    set children($p) [list $id]
	    set nchildren($p) 1
	    set ncleft($p) 1
	} elseif {[lsearch -exact $children($p) $id] < 0} {
	    lappend children($p) $id
	    incr nchildren($p)
	    incr ncleft($p)
	}
    }
    regsub -all "\r\n" $contents "\n" contents
    foreach line [split $contents "\n"] {
	if {$inhdr} {
	    set line [split $line]
	    if {$line == {}} {
		set inhdr 0
	    } else {
		set tag [lindex $line 0]
		if {$tag == "author"} {
		    set x [expr {[llength $line] - 2}]
		    set audate [lindex $line $x]
		    set auname [join [lrange $line 1 [expr {$x - 1}]]]
		} elseif {$tag == "committer"} {
		    set x [expr {[llength $line] - 2}]
		    set comdate [lindex $line $x]
		    set comname [join [lrange $line 1 [expr {$x - 1}]]]
		} elseif {$tag == "revision"} {
		    set rev [lindex $line 1]
        } elseif {$tag == "branch"} {
		    set branch [join [lrange $line 1 end]]
        } elseif {$tag == "bookmark"} {
		    set bookmark [join [lrange $line 1 end]]
        }
	    }
	} else {
	    if {$comment == {}} {
		set headline [string trim $line]
	    } else {
		append comment "\n"
	    }
	    if {!$listed} {
		# git-rev-list indents the comment by 4 spaces;
		# if we got this via git-cat-file, add the indentation
		append comment "    "
	    }
	    append comment $line
	}
    }
    if {$audate != {}} {
	set audate [clock format $audate]
    }
    if {$comdate != {}} {
	set cdate($id) $comdate
	set comdate [clock format $comdate]
    }
    set commitinfo($id) [list $headline $auname $audate \
			     $comname $comdate $comment $rev $branch $bookmark]

    if {[info exists firstparents]} {
        set i [lsearch $firstparents $id]
        if {$i != -1} {
            # remove the parent from firstparents, possible building
            # an empty list
            set firstparents [concat \
                                  [lrange $firstparents 0 [expr $i - 1]] \
                                  [lrange $firstparents [expr $i + 1] end]]
            if {$firstparents eq {}} {
                # we have found all parents of the first changeset
                # which means that we can safely select the first line
                after idle {
                    selectline 0 0
                }
            }
        }
    } else {
        # this is the first changeset, save the parents
        set firstparents $olds
        if {$firstparents eq {}} {
            # a repository with a single changeset
            after idle {
                selectline 0 0
            }
        }
    }
}

proc readrefs {} {
    global bookmarkcurrent bookmarkids tagids idtags idbookmarks headids idheads tagcontents env curid

    set status [catch {exec $env(HG) --config ui.report_untrusted=false id} curid]
    if { $status != 0 } {
        puts $::errorInfo
        if { ![string equal $::errorCode NONE] } {
            exit 2
        }
    }
    regexp -- {[[:xdigit:]]+} $curid curid

    set status [catch {exec $env(HG) --config ui.report_untrusted=false tags} tags]
    if { $status != 0 } {
        puts $::errorInfo
        if { ![string equal $::errorCode NONE] } {
            exit 2
        }
    }

    foreach {- tag rev id} [regexp -inline -all -line {^(.+\S)\s+(\d+):(\S+)} $tags] {
        # we use foreach as Tcl8.4 doesn't support lassign
        lappend tagids($tag) $id
        lappend idtags($id) $tag
    }

    set status [catch {exec $env(HG) --config ui.report_untrusted=false heads} heads]
    if { $status != 0 } {
        puts $::errorInfo
        if { ![string equal $::errorCode NONE] } {
            exit 2
        }
    }

    set lines [split $heads \r\n]
    foreach f $lines {
        set match ""
        regexp {changeset:\s+(\S+):(\S+)$} $f match id sha
        if {$match != ""} {
        lappend idheads($sha) $id
        }
    }

    set status [catch {exec $env(HG) --config ui.report_untrusted=false bookmarks} bookmarks]
    if { $status != 0 } {
        puts $::errorInfo
        if { ![string equal $::errorCode NONE] } {
            exit 2
        }
    }
    set lines [split $bookmarks "\n"]
    set bookmarkcurrent 0
    foreach f $lines {
	regexp {(\S+)$} $f full
	regsub {\s+(\S+)$} $f "" direct
	set sha [split $full ':']
	set bookmark [lindex $sha 1]
	set current [string first " * " $direct)]
	regsub {^\s(\*|\s)\s} $direct "" direct
	lappend bookmarkids($direct) $bookmark
	lappend idbookmarks($bookmark) $direct
	if {$current >= 0} {
		set bookmarkcurrent $direct
	}
    }
}

proc readotherrefs {base dname excl} {
    global otherrefids idotherrefs

    set git [gitdir]
    set files [glob -nocomplain -types f [file join $git $base *]]
    foreach f $files {
	catch {
	    set fd [open $f r]
	    set line [read $fd 40]
	    if {[regexp {^[0-9a-f]{12}} $line id]} {
		set name "$dname[file tail $f]"
		set otherrefids($name) $id
		lappend idotherrefs($id) $name
	    }
	    close $fd
	}
    }
    set dirs [glob -nocomplain -types d [file join $git $base *]]
    foreach d $dirs {
	set dir [file tail $d]
	if {[lsearch -exact $excl $dir] >= 0} continue
	readotherrefs [file join $base $dir] "$dname$dir/" {}
    }
}

proc allcansmousewheel {delta} {
    set delta [expr -5*(int($delta)/abs($delta))]
    allcanvs yview scroll $delta units
}

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

proc makewindow {} {
    global canv canv2 canv3 linespc charspc ctext cflist textfont
    global findtype findtypemenu findloc findstring fstring geometry
    global entries sha1entry sha1string sha1but
    global maincursor textcursor curtextcursor
    global rowctxmenu gaudydiff mergemax
    global hgvdiff bgcolor fgcolor diffremcolor diffaddcolor diffmerge1color
    global diffmerge2color hunksepcolor
    global posx posy

    if {[info exists posx]} {
        wm geometry . +$posx+$posy
    }

    menu .bar
    .bar add cascade -label "File" -menu .bar.file
    menu .bar.file
    .bar.file add command -label "Reread references" -command rereadrefs
    .bar.file add command -label "Quit" -command doquit
    menu .bar.help
    .bar add cascade -label "Help" -menu .bar.help
    .bar.help add command -label "About hgk" -command about
    . configure -menu .bar

    if {![info exists geometry(canv1)]} {
	set geometry(canv1) [expr 45 * $charspc]
	set geometry(canv2) [expr 30 * $charspc]
	set geometry(canv3) [expr 15 * $charspc]
	set geometry(canvh) [expr 25 * $linespc + 4]
	set geometry(ctextw) 80
	set geometry(ctexth) 30
	set geometry(cflistw) 30
    }
    panedwindow .ctop -orient vertical
    if {[info exists geometry(width)]} {
	.ctop conf -width $geometry(width) -height $geometry(height)
	set texth [expr {$geometry(height) - $geometry(canvh) - 56}]
	set geometry(ctexth) [expr {($texth - 8) /
				    [font metrics $textfont -linespace]}]
    }
    ttk::frame .ctop.top
    ttk::frame .ctop.top.bar
    pack .ctop.top.bar -side bottom -fill x
    set cscroll .ctop.top.csb
    ttk::scrollbar $cscroll -command {allcanvs yview}
    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 $bgcolor -bd 0 \
	-yscrollincr $linespc -yscrollcommand "$cscroll set" -selectbackground "#c0c0c0"
    .ctop.top.clist add $canv
    set canv2 .ctop.top.clist.canv2
    canvas $canv2 -height $geometry(canvh) -width $geometry(canv2) \
	-bg $bgcolor -bd 0 -yscrollincr $linespc -selectbackground "#c0c0c0"
    .ctop.top.clist add $canv2
    set canv3 .ctop.top.clist.canv3
    canvas $canv3 -height $geometry(canvh) -width $geometry(canv3) \
	-bg $bgcolor -bd 0 -yscrollincr $linespc -selectbackground "#c0c0c0"
    .ctop.top.clist add $canv3
    bind .ctop.top.clist <Configure> {resizeclistpanes %W %w}

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

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

    panedwindow .ctop.cdet -orient horizontal
    .ctop add .ctop.cdet
    ttk::frame .ctop.cdet.left
    set ctext .ctop.cdet.left.ctext
    text $ctext -fg $fgcolor -bg $bgcolor -state disabled -font $textfont \
	-width $geometry(ctextw) -height $geometry(ctexth) \
	-yscrollcommand ".ctop.cdet.left.sb set" \
	-xscrollcommand ".ctop.cdet.left.hb set" -wrap none
    ttk::scrollbar .ctop.cdet.left.sb -command "$ctext yview"
    ttk::scrollbar .ctop.cdet.left.hb -orient horizontal -command "$ctext xview"
    pack .ctop.cdet.left.sb -side right -fill y
    pack .ctop.cdet.left.hb -side bottom -fill x
    pack $ctext -side left -fill both -expand 1
    .ctop.cdet add .ctop.cdet.left

    $ctext tag conf filesep -font [concat $textfont bold] -back "#aaaaaa"
    if {$gaudydiff} {
	$ctext tag conf hunksep -back blue -fore white
	$ctext tag conf d0 -back "#ff8080"
	$ctext tag conf d1 -back green
    } else {
	$ctext tag conf hunksep -fore $hunksepcolor
	$ctext tag conf d0 -fore $diffremcolor
	$ctext tag conf d1 -fore $diffaddcolor

	# The mX colours seem to be used in merge changesets, where m0
	# is first parent, m1 is second parent and so on. Git can have
	# several parents, Hg cannot, so I think the m2..mmax would be
	# unused.
	$ctext tag conf m0 -fore $diffmerge1color
	$ctext tag conf m1 -fore $diffmerge2color
	$ctext tag conf m2 -fore green
	$ctext tag conf m3 -fore purple
	$ctext tag conf m4 -fore brown
	$ctext tag conf mmax -fore darkgrey
	set mergemax 5
	$ctext tag conf mresult -font [concat $textfont bold]
	$ctext tag conf msep -font [concat $textfont bold]
	$ctext tag conf found -back yellow
    }

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

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

    bindall <1> {selcanvline %W %x %y}
    #bindall <B1-Motion> {selcanvline %W %x %y}
    bindall <MouseWheel> "allcansmousewheel %D"
    bindall <ButtonRelease-4> "allcanvs yview scroll -5 units"
    bindall <ButtonRelease-5> "allcanvs yview scroll 5 units"
    bindall <2> "allcanvs scan mark 0 %y"
    bindall <B2-Motion> "allcanvs scan dragto 0 %y"
    bind . <Key-Up> "selnextline -1"
    bind . <Key-Down> "selnextline 1"
    bind . <Key-Prior> "allcanvs yview scroll -1 pages"
    bind . <Key-Next> "allcanvs yview scroll 1 pages"
    bindkey <Key-Delete> "$ctext yview scroll -1 pages"
    bindkey <Key-BackSpace> "$ctext yview scroll -1 pages"
    bindkey <Key-space> "$ctext yview scroll 1 pages"
    bindkey p "selnextline -1"
    bindkey n "selnextline 1"
    bindkey b "$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-w> doquit
    bind . <Control-f> dofind
    bind . <Control-g> {findnext 0}
    bind . <Control-r> findprev
    bind . <Control-equal> {incrfont 1}
    bind . <Control-KP_Add> {incrfont 1}
    bind . <Control-minus> {incrfont -1}
    bind . <Control-KP_Subtract> {incrfont -1}
    bind $cflist <<ListboxSelect>> listboxsel
    bind . <Destroy> {savestuff %W}
    bind . <Button-1> "click %W"
    bind $fstring <Key-Return> dofind
    bind $sha1entry <Key-Return> gotocommit
    bind $sha1entry <<PasteSelection>> clearsha1

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

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

# 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
    global stuffsaved findmergefiles gaudydiff maxgraphpct
    global maxwidth authorcolors curidfont bgcolor fgcolor
    global diffremcolor diffaddcolor hunksepcolor
    global diffmerge1color diffmerge2color

    if {$stuffsaved} return
    if {![winfo viewable .]} return
    catch {
	set f [open "~/.hgk-new" w]
	puts $f [list set mainfont $mainfont]
	puts $f [list set curidfont $curidfont]
	puts $f [list set textfont $textfont]
	puts $f [list set findmergefiles $findmergefiles]
	puts $f [list set gaudydiff $gaudydiff]
	puts $f [list set maxgraphpct $maxgraphpct]
	puts $f [list set maxwidth $maxwidth]
	puts $f "set geometry(width) [winfo width .ctop]"
	puts $f "set geometry(height) [winfo height .ctop]"
	puts $f "set geometry(canv1) [expr [winfo width $canv]-2]"
	puts $f "set geometry(canv2) [expr [winfo width $canv2]-2]"
	puts $f "set geometry(canv3) [expr [winfo width $canv3]-2]"
	puts $f "set geometry(canvh) [expr [winfo height $canv]-2]"
	set wid [expr {([winfo width $ctext] - 8) \
			   / [font measure $textfont "0"]}]
	puts $f "set geometry(ctextw) $wid"
	set wid [expr {([winfo width $cflist] - 11) \
			   / [font measure [$cflist cget -font] "0"]}]
	puts $f "set geometry(cflistw) $wid"
	puts $f "#"
	puts $f "# main window position:"
	puts $f "set posx [winfo x .]"
	puts $f "set posy [winfo y .]"
	puts $f "#"
	puts $f "# authorcolors format:"
	puts $f "#"
	puts $f "# zero or more sublists of"
	puts $f "#"
	puts $f "#    { regex color }"
	puts $f "#"
	puts $f "# followed by a list of colors"
	puts $f "#"
	puts $f "# If the commit author matches a regex in a sublist,"
	puts $f "# the commit will be colored by that color"
	puts $f "# otherwise the next unused entry from the list of colors"
	puts $f "# will be assigned to this commit and also all other commits"
	puts $f "# of the same author.  When the list of colors is exhausted,"
	puts $f "# the last entry will be reused."
	puts $f "#"
	puts $f "set authorcolors {$authorcolors}"
	puts $f "#"
	puts $f "# The background color in the text windows"
	puts $f "set bgcolor $bgcolor"
	puts $f "#"
	puts $f "# The text color used in the diff and file list view"
	puts $f "set fgcolor $fgcolor"
	puts $f "#"
	puts $f "# Color to display + lines in diffs"
	puts $f "set diffaddcolor $diffaddcolor"
	puts $f "#"
	puts $f "# Color to display - lines in diffs"
	puts $f "set diffremcolor $diffremcolor"
	puts $f "#"
	puts $f "# Merge diffs: Color to signal lines from first parent"
	puts $f "set diffmerge1color $diffmerge1color"
	puts $f "#"
	puts $f "# Merge diffs: Color to signal lines from second parent"
	puts $f "set diffmerge2color $diffmerge2color"
	puts $f "#"
	puts $f "# Hunkseparator (@@ -lineno,lines +lineno,lines @@) color"
	puts $f "set hunksepcolor $hunksepcolor"
	close $f
	file rename -force "~/.hgk-new" "~/.hgk"
    }
    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 hgk"
    message $w.m -text {
Hgk version 1.2

Copyright Š 2005 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
    ttk::button $w.ok -text Close -command "destroy $w"
    pack $w.ok -side bottom
    popupify $w
}

set aunextcolor 0
proc assignauthorcolor {name} {
    global authorcolors aucolormap aunextcolor
    if [info exists aucolormap($name)] return

    set randomcolors {black}
    for {set i 0} {$i < [llength $authorcolors]} {incr i} {
	set col [lindex $authorcolors $i]
	if {[llength $col] > 1} {
	    set re [lindex $col 0]
	    set c [lindex $col 1]
	    if {[regexp -- $re $name]} {
		set aucolormap($name) $c
		return
	    }
	} else {
	    set randomcolors [lrange $authorcolors $i end]
	    break
	}
    }

    set ncolors [llength $randomcolors]
    set c [lindex $randomcolors $aunextcolor]
    if {[incr aunextcolor] >= $ncolors} {
	incr aunextcolor -1
    }
    set aucolormap($name) $c
}

proc assigncolor {id} {
    global commitinfo colormap commcolors colors nextcolor
    global parents nparents children nchildren
    global cornercrossings crossings

    if [info exists colormap($id)] return
    set ncolors [llength $colors]
    if {$nparents($id) <= 1 && $nchildren($id) == 1} {
	set child [lindex $children($id) 0]
	if {[info exists colormap($child)]
	    && $nparents($child) == 1} {
	    set colormap($id) $colormap($child)
	    return
	}
    }
    set badcolors {}
    if {[info exists cornercrossings($id)]} {
	foreach x $cornercrossings($id) {
	    if {[info exists colormap($x)]
		&& [lsearch -exact $badcolors $colormap($x)] < 0} {
		lappend badcolors $colormap($x)
	    }
	}
	if {[llength $badcolors] >= $ncolors} {
	    set badcolors {}
	}
    }
    set origbad $badcolors
    if {[llength $badcolors] < $ncolors - 1} {
	if {[info exists crossings($id)]} {
	    foreach x $crossings($id) {
		if {[info exists colormap($x)]
		    && [lsearch -exact $badcolors $colormap($x)] < 0} {
		    lappend badcolors $colormap($x)
		}
	    }
	    if {[llength $badcolors] >= $ncolors} {
		set badcolors $origbad
	    }
	}
	set origbad $badcolors
    }
    if {[llength $badcolors] < $ncolors - 1} {
	foreach child $children($id) {
	    if {[info exists colormap($child)]
		&& [lsearch -exact $badcolors $colormap($child)] < 0} {
		lappend badcolors $colormap($child)
	    }
	    if {[info exists parents($child)]} {
		foreach p $parents($child) {
		    if {[info exists colormap($p)]
			&& [lsearch -exact $badcolors $colormap($p)] < 0} {
			lappend badcolors $colormap($p)
		    }
		}
	    }
	}
	if {[llength $badcolors] >= $ncolors} {
	    set badcolors $origbad
	}
    }
    for {set i 0} {$i <= $ncolors} {incr i} {
	set c [lindex $colors $nextcolor]
	if {[incr nextcolor] >= $ncolors} {
	    set nextcolor 0
	}
	if {[lsearch -exact $badcolors $c]} break
    }
    set colormap($id) $c
}

proc initgraph {} {
    global canvy canvy0 lineno numcommits nextcolor linespc
    global mainline mainlinearrow sidelines
    global nchildren ncleft
    global displist nhyperspace

    allcanvs delete all
    set nextcolor 0
    set canvy $canvy0
    set lineno -1
    set numcommits 0
    catch {unset mainline}
    catch {unset mainlinearrow}
    catch {unset sidelines}
    foreach id [array names nchildren] {
	set ncleft($id) $nchildren($id)
    }
    set displist {}
    set nhyperspace 0
}

proc bindline {t id} {
    global canv

    $canv bind $t <Enter> "lineenter %x %y $id"
    $canv bind $t <Motion> "linemotion %x %y $id"
    $canv bind $t <Leave> "lineleave $id"
    $canv bind $t <Button-1> "lineclick %x %y $id 1"
}

proc drawlines {id xtra} {
    global mainline mainlinearrow sidelines lthickness colormap canv

    $canv delete lines.$id
    if {[info exists mainline($id)]} {
	set t [$canv create line $mainline($id) \
		   -width [expr {($xtra + 1) * $lthickness}] \
		   -fill $colormap($id) -tags lines.$id \
		   -arrow $mainlinearrow($id)]
	$canv lower $t
	bindline $t $id
    }
    if {[info exists sidelines($id)]} {
	foreach ls $sidelines($id) {
	    set coords [lindex $ls 0]
	    set thick [lindex $ls 1]
	    set arrow [lindex $ls 2]
	    set t [$canv create line $coords -fill $colormap($id) \
		       -width [expr {($thick + $xtra) * $lthickness}] \
		       -arrow $arrow -tags lines.$id]
	    $canv lower $t
	    bindline $t $id
	}
    }
}

# level here is an index in displist
proc drawcommitline {level} {
    global parents children nparents displist
    global canv canv2 canv3 mainfont namefont canvy linespc
    global lineid linehtag linentag linedtag commitinfo
    global colormap numcommits currentparents dupparents
    global idtags idline idheads idotherrefs idbookmarks
    global lineno lthickness mainline mainlinearrow sidelines
    global commitlisted rowtextx idpos lastuse displist
    global oldnlines olddlevel olddisplist
    global aucolormap curid curidfont

    incr numcommits
    incr lineno
    set id [lindex $displist $level]
    set lastuse($id) $lineno
    set lineid($lineno) $id
    set idline($id) $lineno
    set ofill [expr {[info exists commitlisted($id)]? "blue": "white"}]
    if {![info exists commitinfo($id)]} {
	readcommit $id
	if {![info exists commitinfo($id)]} {
	    set commitinfo($id) {"No commit information available"}
	    set nparents($id) 0
	}
    }
    assigncolor $id
    set currentparents {}
    set dupparents {}
    if {[info exists commitlisted($id)] && [info exists parents($id)]} {
	foreach p $parents($id) {
	    if {[lsearch -exact $currentparents $p] < 0} {
		lappend currentparents $p
	    } else {
		# remember that this parent was listed twice
		lappend dupparents $p
	    }
	}
    }
    set x [xcoord $level $level $lineno]
    set y1 $canvy
    set canvy [expr $canvy + $linespc]
    allcanvs conf -scrollregion \
	[list 0 0 0 [expr $y1 + 0.5 * $linespc + 2]]
    if {[info exists mainline($id)]} {
	lappend mainline($id) $x $y1
	if {$mainlinearrow($id) ne "none"} {
	    set mainline($id) [trimdiagstart $mainline($id)]
	}
    }
    drawlines $id 0
    set orad [expr {$linespc / 3}]
    set t [$canv create oval [expr $x - $orad] [expr $y1 - $orad] \
	       [expr $x + $orad - 1] [expr $y1 + $orad - 1] \
	       -fill $ofill -outline black -width 1]
    $canv raise $t
    $canv bind $t <1> {selcanvline {} %x %y}
    set xt [xcoord [llength $displist] $level $lineno]
    if {[llength $currentparents] > 2} {
	set xt [expr {$xt + ([llength $currentparents] - 2) * $linespc}]
    }
    set rowtextx($lineno) $xt
    set idpos($id) [list $x $xt $y1]
    if {[info exists idtags($id)] || [info exists idheads($id)]
	|| [info exists idotherrefs($id)] || [info exists idbookmarks($id)]} {
	set xt [drawtags $id $x $xt $y1]
    }
    set headline [lindex $commitinfo($id) 0]
    set name [lindex $commitinfo($id) 1]
    assignauthorcolor $name
    set fg $aucolormap($name)
    if {$id == $curid} {
	set fn $curidfont
    } else {
	set fn $mainfont
    }

    set date [lindex $commitinfo($id) 2]
    set linehtag($lineno) [$canv create text $xt $y1 -anchor w \
			       -text $headline -font $fn \
			       -fill $fg]
    $canv bind $linehtag($lineno) <<B3>> "rowmenu %X %Y $id"
    set linentag($lineno) [$canv2 create text 3 $y1 -anchor w \
			       -text $name -font $namefont \
			       -fill $fg]
    set linedtag($lineno) [$canv3 create text 3 $y1 -anchor w \
			       -text $date -font $mainfont \
			       -fill $fg]

    set olddlevel $level
    set olddisplist $displist
    set oldnlines [llength $displist]
}

proc drawtags {id x xt y1} {
    global bookmarkcurrent idtags idbookmarks idheads idotherrefs commitinfo
    global linespc lthickness
    global canv mainfont idline rowtextx

    set marks {}
    set nbookmarks 0
    set ntags 0
    set nheads 0
    if {[info exists idtags($id)]} {
	set marks $idtags($id)
	set ntags [llength $marks]
    }
    if {[info exists idbookmarks($id)]} {
	set marks [concat $marks $idbookmarks($id)]
	set nbookmarks [llength $idbookmarks($id)]
    }
    if {[info exists idheads($id)]} {
	set headmark [lindex $commitinfo($id) 7]
	if {$headmark ne "default"} {
	    lappend marks $headmark
	    set nheads 1
	}
    }
    if {$marks eq {}} {
	return $xt
    }

    set delta [expr {int(0.5 * ($linespc - $lthickness))}]
    set yt [expr $y1 - 0.5 * $linespc]
    set yb [expr $yt + $linespc - 1]
    set xvals {}
    set wvals {}
    foreach tag $marks {
	set wid [font measure $mainfont $tag]
	lappend xvals $xt
	lappend wvals $wid
	set xt [expr {$xt + $delta + $wid + $lthickness + $linespc}]
    }
    set t [$canv create line $x $y1 [lindex $xvals end] $y1 \
	       -width $lthickness -fill black -tags tag.$id]
    $canv lower $t
    foreach tag $marks x $xvals wid $wvals {
	set xl [expr $x + $delta]
	set xr [expr $x + $delta + $wid + $lthickness]
	if {[incr ntags -1] >= 0} {
	    # draw a tag
	    set t [$canv create polygon $x [expr $yt + $delta] $xl $yt \
		       $xr $yt $xr $yb $xl $yb $x [expr $yb - $delta] \
		       -width 1 -outline black -fill yellow -tags tag.$id]
	    $canv bind $t <1> [list showtag $tag 1]
	    set rowtextx($idline($id)) [expr {$xr + $linespc}]
	} elseif {[incr nbookmarks -1] >= 0} {
            # draw a tag
            set col gray50
            if {[string compare $bookmarkcurrent $tag] == 0} {
                set col gray
            }
            set xl [expr $xl - $delta/2]
            $canv create polygon $x $yt $xr $yt $xr $yb $x $yb \
                -width 1 -outline black -fill $col -tags tag.$id
        } else {
            # draw a head or other ref
            if {[incr nheads -1] >= 0} {
                set col "#00ff00"
            } else {
                set col "#ddddff"
            }
            set xl [expr $xl - $delta/2]
            $canv create polygon $x $yt $xr $yt $xr $yb $x $yb \
                -width 1 -outline black -fill $col -tags tag.$id
	}
	set t [$canv create text $xl $y1 -anchor w -text $tag \
		   -font $mainfont -tags tag.$id]
	if {$ntags >= 0} {
	    $canv bind $t <1> [list showtag $tag 1]
	}
    }
    return $xt
}

proc notecrossings {id lo hi corner} {
    global olddisplist crossings cornercrossings

    for {set i $lo} {[incr i] < $hi} {} {
	set p [lindex $olddisplist $i]
	if {$p == {}} continue
	if {$i == $corner} {
	    if {![info exists cornercrossings($id)]
		|| [lsearch -exact $cornercrossings($id) $p] < 0} {
		lappend cornercrossings($id) $p
	    }
	    if {![info exists cornercrossings($p)]
		|| [lsearch -exact $cornercrossings($p) $id] < 0} {
		lappend cornercrossings($p) $id
	    }
	} else {
	    if {![info exists crossings($id)]
		|| [lsearch -exact $crossings($id) $p] < 0} {
		lappend crossings($id) $p
	    }
	    if {![info exists crossings($p)]
		|| [lsearch -exact $crossings($p) $id] < 0} {
		lappend crossings($p) $id
	    }
	}
    }
}

proc xcoord {i level ln} {
    global canvx0 xspc1 xspc2

    set x [expr {$canvx0 + $i * $xspc1($ln)}]
    if {$i > 0 && $i == $level} {
	set x [expr {$x + 0.5 * ($xspc2 - $xspc1($ln))}]
    } elseif {$i > $level} {
	set x [expr {$x + $xspc2 - $xspc1($ln)}]
    }
    return $x
}

# it seems Tk can't draw arrows on the end of diagonal line segments...
proc trimdiagend {line} {
    while {[llength $line] > 4} {
	set x1 [lindex $line end-3]
	set y1 [lindex $line end-2]
	set x2 [lindex $line end-1]
	set y2 [lindex $line end]
	if {($x1 == $x2) != ($y1 == $y2)} break
	set line [lreplace $line end-1 end]
    }
    return $line
}

proc trimdiagstart {line} {
    while {[llength $line] > 4} {
	set x1 [lindex $line 0]
	set y1 [lindex $line 1]
	set x2 [lindex $line 2]
	set y2 [lindex $line 3]
	if {($x1 == $x2) != ($y1 == $y2)} break
	set line [lreplace $line 0 1]
    }
    return $line
}

proc drawslants {id needonscreen nohs} {
    global canv mainline mainlinearrow sidelines
    global canvx0 canvy xspc1 xspc2 lthickness
    global currentparents dupparents
    global lthickness linespc canvy colormap lineno geometry
    global maxgraphpct maxwidth
    global displist onscreen lastuse
    global parents commitlisted
    global oldnlines olddlevel olddisplist
    global nhyperspace numcommits nnewparents

    if {$lineno < 0} {
	lappend displist $id
	set onscreen($id) 1
	return 0
    }

    set y1 [expr {$canvy - $linespc}]
    set y2 $canvy

    # work out what we need to get back on screen
    set reins {}
    if {$onscreen($id) < 0} {
	# next to do isn't displayed, better get it on screen...
	lappend reins [list $id 0]
    }
    # make sure all the previous commits's parents are on the screen
    foreach p $currentparents {
	if {$onscreen($p) < 0} {
	    lappend reins [list $p 0]
	}
    }
    # bring back anything requested by caller
    if {$needonscreen ne {}} {
	lappend reins $needonscreen
    }

    # try the shortcut
    if {$currentparents == $id && $onscreen($id) == 0 && $reins eq {}} {
	set dlevel $olddlevel
	set x [xcoord $dlevel $dlevel $lineno]
	set mainline($id) [list $x $y1]
	set mainlinearrow($id) none
	set lastuse($id) $lineno
	set displist [lreplace $displist $dlevel $dlevel $id]
	set onscreen($id) 1
	set xspc1([expr {$lineno + 1}]) $xspc1($lineno)
	return $dlevel
    }

    # update displist
    set displist [lreplace $displist $olddlevel $olddlevel]
    set j $olddlevel
    foreach p $currentparents {
	set lastuse($p) $lineno
	if {$onscreen($p) == 0} {
	    set displist [linsert $displist $j $p]
	    set onscreen($p) 1
	    incr j
	}
    }
    if {$onscreen($id) == 0} {
	lappend displist $id
	set onscreen($id) 1
    }

    # remove the null entry if present
    set nullentry [lsearch -exact $displist {}]
    if {$nullentry >= 0} {
	set displist [lreplace $displist $nullentry $nullentry]
    }

    # bring back the ones we need now (if we did it earlier
    # it would change displist and invalidate olddlevel)
    foreach pi $reins {
	# test again in case of duplicates in reins
	set p [lindex $pi 0]
	if {$onscreen($p) < 0} {
	    set onscreen($p) 1
	    set lastuse($p) $lineno
	    set displist [linsert $displist [lindex $pi 1] $p]
	    incr nhyperspace -1
	}
    }

    set lastuse($id) $lineno

    # see if we need to make any lines jump off into hyperspace
    set displ [llength $displist]
    if {$displ > $maxwidth} {
	set ages {}
	foreach x $displist {
	    lappend ages [list $lastuse($x) $x]
	}
	set ages [lsort -integer -index 0 $ages]
	set k 0
	while {$displ > $maxwidth} {
	    set use [lindex $ages $k 0]
	    set victim [lindex $ages $k 1]
	    if {$use >= $lineno - 5} break
	    incr k
	    if {[lsearch -exact $nohs $victim] >= 0} continue
	    set i [lsearch -exact $displist $victim]
	    set displist [lreplace $displist $i $i]
	    set onscreen($victim) -1
	    incr nhyperspace
	    incr displ -1
	    if {$i < $nullentry} {
		incr nullentry -1
	    }
	    set x [lindex $mainline($victim) end-1]
	    lappend mainline($victim) $x $y1
	    set line [trimdiagend $mainline($victim)]
	    set arrow "last"
	    if {$mainlinearrow($victim) ne "none"} {
		set line [trimdiagstart $line]
		set arrow "both"
	    }
	    lappend sidelines($victim) [list $line 1 $arrow]
	    unset mainline($victim)
	}
    }

    set dlevel [lsearch -exact $displist $id]

    # If we are reducing, put in a null entry
    if {$displ < $oldnlines} {
	# does the next line look like a merge?
	# i.e. does it have > 1 new parent?
	if {$nnewparents($id) > 1} {
	    set i [expr {$dlevel + 1}]
	} elseif {$nnewparents([lindex $olddisplist $olddlevel]) == 0} {
	    set i $olddlevel
	    if {$nullentry >= 0 && $nullentry < $i} {
		incr i -1
	    }
	} elseif {$nullentry >= 0} {
	    set i $nullentry
	    while {$i < $displ
		   && [lindex $olddisplist $i] == [lindex $displist $i]} {
		incr i
	    }
	} else {
	    set i $olddlevel
	    if {$dlevel >= $i} {
		incr i
	    }
	}
	if {$i < $displ} {
	    set displist [linsert $displist $i {}]
	    incr displ
	    if {$dlevel >= $i} {
		incr dlevel
	    }
	}
    }

    # decide on the line spacing for the next line
    set lj [expr {$lineno + 1}]
    set maxw [expr {$maxgraphpct * $geometry(canv1) / 100}]
    if {$displ <= 1 || $canvx0 + $displ * $xspc2 <= $maxw} {
	set xspc1($lj) $xspc2
    } else {
	set xspc1($lj) [expr {($maxw - $canvx0 - $xspc2) / ($displ - 1)}]
	if {$xspc1($lj) < $lthickness} {
	    set xspc1($lj) $lthickness
	}
    }

    foreach idi $reins {
	set id [lindex $idi 0]
	set j [lsearch -exact $displist $id]
	set xj [xcoord $j $dlevel $lj]
	set mainline($id) [list $xj $y2]
	set mainlinearrow($id) first
    }

    set i -1
    foreach id $olddisplist {
	incr i
	if {$id == {}} continue
	if {$onscreen($id) <= 0} continue
	set xi [xcoord $i $olddlevel $lineno]
	if {$i == $olddlevel} {
	    foreach p $currentparents {
		set j [lsearch -exact $displist $p]
		set coords [list $xi $y1]
		set xj [xcoord $j $dlevel $lj]
		if {$xj < $xi - $linespc} {
		    lappend coords [expr {$xj + $linespc}] $y1
		    notecrossings $p $j $i [expr {$j + 1}]
		} elseif {$xj > $xi + $linespc} {
		    lappend coords [expr {$xj - $linespc}] $y1
		    notecrossings $p $i $j [expr {$j - 1}]
		}
		if {[lsearch -exact $dupparents $p] >= 0} {
		    # draw a double-width line to indicate the doubled parent
		    lappend coords $xj $y2
		    lappend sidelines($p) [list $coords 2 none]
		    if {![info exists mainline($p)]} {
			set mainline($p) [list $xj $y2]
			set mainlinearrow($p) none
		    }
		} else {
		    # normal case, no parent duplicated
		    set yb $y2
		    set dx [expr {abs($xi - $xj)}]
		    if {0 && $dx < $linespc} {
			set yb [expr {$y1 + $dx}]
		    }
		    if {![info exists mainline($p)]} {
			if {$xi != $xj} {
			    lappend coords $xj $yb
			}
			set mainline($p) $coords
			set mainlinearrow($p) none
		    } else {
			lappend coords $xj $yb
			if {$yb < $y2} {
			    lappend coords $xj $y2
			}
			lappend sidelines($p) [list $coords 1 none]
		    }
		}
	    }
	} else {
	    set j $i
	    if {[lindex $displist $i] != $id} {
		set j [lsearch -exact $displist $id]
	    }
	    if {$j != $i || $xspc1($lineno) != $xspc1($lj)
		|| ($olddlevel < $i && $i < $dlevel)
		|| ($dlevel < $i && $i < $olddlevel)} {
		set xj [xcoord $j $dlevel $lj]
		lappend mainline($id) $xi $y1 $xj $y2
	    }
	}
    }
    return $dlevel
}

# search for x in a list of lists
proc llsearch {llist x} {
    set i 0
    foreach l $llist {
	if {$l == $x || [lsearch -exact $l $x] >= 0} {
	    return $i
	}
	incr i
    }
    return -1
}

proc drawmore {reading} {
    global displayorder numcommits ncmupdate nextupdate
    global stopped nhyperspace parents commitlisted
    global maxwidth onscreen displist currentparents olddlevel

    set n [llength $displayorder]
    while {$numcommits < $n} {
	set id [lindex $displayorder $numcommits]
	set ctxend [expr {$numcommits + 10}]
	if {!$reading && $ctxend > $n} {
	    set ctxend $n
	}
	set dlist {}
	if {$numcommits > 0} {
	    set dlist [lreplace $displist $olddlevel $olddlevel]
	    set i $olddlevel
	    foreach p $currentparents {
		if {$onscreen($p) == 0} {
		    set dlist [linsert $dlist $i $p]
		    incr i
		}
	    }
	}
	set nohs {}
	set reins {}
	set isfat [expr {[llength $dlist] > $maxwidth}]
	if {$nhyperspace > 0 || $isfat} {
	    if {$ctxend > $n} break
	    # work out what to bring back and
	    # what we want to don't want to send into hyperspace
	    set room 1
	    for {set k $numcommits} {$k < $ctxend} {incr k} {
		set x [lindex $displayorder $k]
		set i [llsearch $dlist $x]
		if {$i < 0} {
		    set i [llength $dlist]
		    lappend dlist $x
		}
		if {[lsearch -exact $nohs $x] < 0} {
		    lappend nohs $x
		}
		if {$reins eq {} && $onscreen($x) < 0 && $room} {
		    set reins [list $x $i]
		}
		set newp {}
		if {[info exists commitlisted($x)]} {
		    set right 0
		    foreach p $parents($x) {
			if {[llsearch $dlist $p] < 0} {
			    lappend newp $p
			    if {[lsearch -exact $nohs $p] < 0} {
				lappend nohs $p
			    }
			    if {$reins eq {} && $onscreen($p) < 0 && $room} {
				set reins [list $p [expr {$i + $right}]]
			    }
			}
			set right 1
		    }
		}
		set l [lindex $dlist $i]
		if {[llength $l] == 1} {
		    set l $newp
		} else {
		    set j [lsearch …