X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=gitk;h=7c25d2ef9702b696fdec62b07943a868260dc4ea;hb=cb303a949f0a6eaa32125b6a52acb9476f71632f;hp=9c435873f90a6c601acbfc365068a908dbe32482;hpb=f3408449622cad37ce29f23754c8e7a8fb453ff1;p=git.git

diff --git a/gitk b/gitk
index 9c435873..7c25d2ef 100755
--- a/gitk
+++ b/gitk
@@ -16,37 +16,26 @@ proc gitdir {} {
     }
 }
 
-proc parse_args {rargs} {
-    global parsed_args
-
-    if {[catch {
-	set parse_args [concat --default HEAD $rargs]
-	set parsed_args [split [eval exec git-rev-parse $parse_args] "\n"]
-    }]} {
-	# if git-rev-parse failed for some reason...
-	if {$rargs == {}} {
-	    set rargs HEAD
-	}
-	set parsed_args $rargs
-    }
-    return $parsed_args
-}
-
-proc start_rev_list {rlargs} {
+proc start_rev_list {} {
     global startmsecs nextupdate ncmupdate
     global commfd leftover tclencoding datemode
+    global revtreeargs curview viewfiles
 
     set startmsecs [clock clicks -milliseconds]
     set nextupdate [expr {$startmsecs + 100}]
     set ncmupdate 1
     initlayout
+    set args $revtreeargs
+    if {$viewfiles($curview) ne {}} {
+	set args [concat $args "--" $viewfiles($curview)]
+    }
     set order "--topo-order"
     if {$datemode} {
 	set order "--date-order"
     }
     if {[catch {
 	set commfd [open [concat | git-rev-list --header $order \
-			      --parents --boundary $rlargs] r]
+			      --parents --boundary --default HEAD $args] r]
     } err]} {
 	puts stderr "Error executing git-rev-list: $err"
 	exit 1
@@ -61,11 +50,23 @@ proc start_rev_list {rlargs} {
     settextcursor watch
 }
 
-proc getcommits {rargs} {
+proc stop_rev_list {} {
+    global commfd
+
+    if {![info exists commfd]} return
+    catch {
+	set pid [pid $commfd]
+	exec kill $pid
+    }
+    catch {close $commfd}
+    unset commfd
+}
+
+proc getcommits {} {
     global phase canv mainfont
 
     set phase getcommits
-    start_rev_list [parse_args $rargs]
+    start_rev_list
     $canv delete all
     $canv create text 3 3 -anchor nw -text "Reading commits..." \
 	-font $mainfont -tags textitems
@@ -75,6 +76,7 @@ proc getcommitlines {commfd}  {
     global commitlisted nextupdate
     global leftover
     global displayorder commitidx commitrow commitdata
+    global parentlist childlist children
 
     set stuff [read $commfd]
     if {$stuff == {}} {
@@ -140,15 +142,28 @@ proc getcommitlines {commfd}  {
 	set id [lindex $ids 0]
 	if {$listed} {
 	    set olds [lrange $ids 1 end]
-	    set commitlisted($id) 1
+	    set i 0
+	    foreach p $olds {
+		if {$i == 0 || [lsearch -exact $olds $p] >= $i} {
+		    lappend children($p) $id
+		}
+		incr i
+	    }
 	} else {
 	    set olds {}
 	}
-	updatechildren $id $olds
+	lappend parentlist $olds
+	if {[info exists children($id)]} {
+	    lappend childlist $children($id)
+	    unset children($id)
+	} else {
+	    lappend childlist {}
+	}
 	set commitdata($id) [string range $cmit [expr {$j + 1}] end]
 	set commitrow($id) $commitidx
 	incr commitidx
 	lappend displayorder $id
+	lappend commitlisted $listed
 	set gotsome 1
     }
     if {$gotsome} {
@@ -181,43 +196,21 @@ proc doupdate {reading} {
 
 proc readcommit {id} {
     if {[catch {set contents [exec git-cat-file commit $id]}]} return
-    updatechildren $id {}
     parsecommit $id $contents 0
 }
 
-proc updatecommits {rargs} {
-    stopfindproc
-    foreach v {children nchildren parents nparents commitlisted
-	colormap selectedline matchinglines treediffs
-	mergefilelist currentid rowtextx commitrow
-	rowidlist rowoffsets idrowranges idrangedrawn iddrawn
-	linesegends crossings cornercrossings} {
-	global $v
-	catch {unset $v}
-    }
-    allcanvs delete all
-    readrefs
-    getcommits $rargs
-}
-
-proc updatechildren {id olds} {
-    global children nchildren parents nparents
+proc updatecommits {} {
+    global viewdata curview revtreeargs phase
 
-    if {![info exists nchildren($id)]} {
-	set children($id) {}
-	set nchildren($id) 0
-    }
-    set parents($id) $olds
-    set nparents($id) [llength $olds]
-    foreach p $olds {
-	if {![info exists nchildren($p)]} {
-	    set children($p) [list $id]
-	    set nchildren($p) 1
-	} elseif {[lsearch -exact $children($p) $id] < 0} {
-	    lappend children($p) $id
-	    incr nchildren($p)
-	}
+    if {$phase ne {}} {
+	stop_rev_list
+	set phase {}
     }
+    set n $curview
+    set curview -1
+    catch {unset viewdata($n)}
+    readrefs
+    showview $n
 }
 
 proc parsecommit {id contents listed} {
@@ -274,7 +267,7 @@ proc parsecommit {id contents listed} {
 }
 
 proc getcommit {id} {
-    global commitdata commitinfo nparents
+    global commitdata commitinfo
 
     if {[info exists commitdata($id)]} {
 	parsecommit $id $commitdata($id) 1
@@ -282,7 +275,6 @@ proc getcommit {id} {
 	readcommit $id
 	if {![info exists commitinfo($id)]} {
 	    set commitinfo($id) {"No commit information available"}
-	    set nparents($id) 0
 	}
     }
     return 1
@@ -295,16 +287,22 @@ proc readrefs {} {
     foreach v {tagids idtags headids idheads otherrefids idotherrefs} {
 	catch {unset $v}
     }
-    set refd [open [list | git-ls-remote [gitdir]] r]
+    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
@@ -345,8 +343,9 @@ proc error_popup msg {
     tkwait window $w
 }
 
-proc makewindow {rargs} {
-    global canv canv2 canv3 linespc charspc ctext cflist textfont
+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
@@ -354,16 +353,29 @@ proc makewindow {rargs} {
 
     menu .bar
     .bar add cascade -label "File" -menu .bar.file
+    .bar configure -font $uifont
     menu .bar.file
-    .bar.file add command -label "Update" -command [list updatecommits $rargs]
+    .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
+    .bar.view add command -label "Edit view..." -command editview
+    .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)]} {
@@ -410,7 +422,7 @@ proc makewindow {rargs} {
     set entries $sha1entry
     set sha1but .ctop.top.bar.sha1label
     button $sha1but -text "SHA1 ID: " -state disabled -relief flat \
-	-command gotocommit -width 8
+	-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
@@ -440,19 +452,24 @@ proc makewindow {rargs} {
 	-state disabled -width 26
     pack .ctop.top.bar.rightbut -side left -fill y
 
-    button .ctop.top.bar.findbut -text "Find" -command dofind
+    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
+    entry $fstring -width 30 -font $textfont -textvariable findstring -font $textfont
     pack $fstring -side left -expand 1 -fill x
     set findtype Exact
     set findtypemenu [tk_optionMenu .ctop.top.bar.findtype \
 			  findtype Exact IgnCase Regexp]
+    .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 Files Pickaxe
+    .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
     # for making sure type==Exact whenever loc==Pickaxe
@@ -499,7 +516,7 @@ proc makewindow {rargs} {
     frame .ctop.cdet.right
     set cflist .ctop.cdet.right.cfiles
     listbox $cflist -bg white -selectmode extended -width $geometry(cflistw) \
-	-yscrollcommand ".ctop.cdet.right.sb set"
+	-yscrollcommand ".ctop.cdet.right.sb set" -font $mainfont
     scrollbar .ctop.cdet.right.sb -command "$cflist yview"
     pack .ctop.cdet.right.sb -side right -fill y
     pack $cflist -side left -fill both -expand 1
@@ -512,14 +529,22 @@ proc makewindow {rargs} {
     #bindall <B1-Motion> {selcanvline %W %x %y}
     bindall <ButtonRelease-4> "allcanvs yview scroll -5 units"
     bindall <ButtonRelease-5> "allcanvs yview scroll 5 units"
-    bindall <2> "allcanvs scan mark 0 %y"
-    bindall <B2-Motion> "allcanvs scan dragto 0 %y"
+    bindall <2> "canvscan mark %W %x %y"
+    bindall <B2-Motion> "canvscan dragto %W %x %y"
+    bindkey <Home> selfirstline
+    bindkey <End> sellastline
     bind . <Key-Up> "selnextline -1"
     bind . <Key-Down> "selnextline 1"
-    bind . <Key-Right> "goforw"
-    bind . <Key-Left> "goback"
-    bind . <Key-Prior> "allcanvs yview scroll -1 pages"
-    bind . <Key-Next> "allcanvs yview scroll 1 pages"
+    bindkey <Key-Right> "goforw"
+    bindkey <Key-Left> "goback"
+    bind . <Key-Prior> "selnextpage -1"
+    bind . <Key-Next> "selnextpage 1"
+    bind . <Control-Home> "allcanvs yview moveto 0.0"
+    bind . <Control-End> "allcanvs yview moveto 1.0"
+    bind . <Control-Key-Up> "allcanvs yview scroll -1 units"
+    bind . <Control-Key-Down> "allcanvs yview scroll 1 units"
+    bind . <Control-Key-Prior> "allcanvs yview scroll -1 pages"
+    bind . <Control-Key-Next> "allcanvs yview scroll 1 pages"
     bindkey <Key-Delete> "$ctext yview scroll -1 pages"
     bindkey <Key-BackSpace> "$ctext yview scroll -1 pages"
     bindkey <Key-space> "$ctext yview scroll 1 pages"
@@ -568,6 +593,19 @@ proc makewindow {rargs} {
     $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
@@ -599,9 +637,10 @@ proc click {w} {
 }
 
 proc savestuff {w} {
-    global canv canv2 canv3 ctext cflist mainfont textfont
+    global canv canv2 canv3 ctext cflist mainfont textfont uifont
     global stuffsaved findmergefiles maxgraphpct
     global maxwidth
+    global viewname viewfiles viewperm nextviewnum
 
     if {$stuffsaved} return
     if {![winfo viewable .]} return
@@ -609,6 +648,7 @@ proc savestuff {w} {
 	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]
@@ -624,6 +664,13 @@ proc savestuff {w} {
 	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)]}"
+	    }
+	}
+	puts $f "}"
 	close $f
 	file rename -force "~/.gitk-new" "~/.gitk"
     }
@@ -716,6 +763,329 @@ Use and redistribute under the terms of the GNU General Public License} \
     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
+<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
+<Ctrl-R>		Move to previous 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-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
+}
+
+proc newview {} {
+    global nextviewnum newviewname newviewperm uifont
+
+    set top .gitkview
+    if {[winfo exists $top]} {
+	raise $top
+	return
+    }
+    set newviewname($nextviewnum) "View $nextviewnum"
+    set newviewperm($nextviewnum) 0
+    vieweditor $top $nextviewnum "Gitk view definition" 
+}
+
+proc editview {} {
+    global curview
+    global viewname viewperm newviewname newviewperm
+
+    set top .gitkvedit-$curview
+    if {[winfo exists $top]} {
+	raise $top
+	return
+    }
+    set newviewname($curview) $viewname($curview)
+    set newviewperm($curview) $viewperm($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.l -aspect 500 -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 w -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 viewmenuitem {n} {
+    set nmenu [.bar.view index end]
+    set targetcmd [list showview $n]
+    for {set i 6} {$i <= $nmenu} {incr i} {
+	if {[.bar.view entrycget $i -command] eq $targetcmd} {
+	    return $i
+	}
+    }
+    return {}
+}
+
+proc newviewok {top n} {
+    global nextviewnum newviewperm newviewname
+    global viewname viewfiles viewperm selectedview curview
+
+    set files {}
+    foreach f [split [$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
+	.bar.view add radiobutton -label $viewname($n) \
+	    -command [list showview $n] -variable selectedview -value $n
+	after idle showview $n
+    } else {
+	# editing an existing view
+	set viewperm($n) $newviewperm($n)
+	if {$newviewname($n) ne $viewname($n)} {
+	    set viewname($n) $newviewname($n)
+	    set i [viewmenuitem $n]
+	    if {$i ne {}} {
+		.bar.view entryconf $i -label $viewname($n)
+	    }
+	}
+	if {$files ne $viewfiles($n)} {
+	    set viewfiles($n) $files
+	    if {$curview == $n} {
+		after idle updatecommits
+	    }
+	}
+    }
+    catch {destroy $top}
+}
+
+proc delview {} {
+    global curview viewdata viewperm
+
+    if {$curview == 0} return
+    set i [viewmenuitem $curview]
+    if {$i ne {}} {
+	.bar.view delete $i
+    }
+    set viewdata($curview) {}
+    set viewperm($curview) 0
+    showview 0
+}
+
+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\($i\) $v
+    }
+}
+
+proc showview {n} {
+    global curview viewdata viewfiles
+    global displayorder parentlist childlist rowidlist rowoffsets
+    global colormap rowtextx commitrow
+    global numcommits rowrangelist commitlisted idrowranges
+    global selectedline currentid canv canvy0
+    global matchinglines treediffs
+    global pending_select phase
+    global commitidx rowlaidout rowoptim linesegends leftover
+    global commfd nextupdate
+    global selectedview
+
+    if {$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} {
+	if {$phase ne {}} {
+	    set viewdata($curview) \
+		[list $phase $displayorder $parentlist $childlist $rowidlist \
+		     $rowoffsets $rowrangelist $commitlisted \
+		     [flatten children] [flatten idrowranges] \
+		     [flatten idinlist] \
+		     $commitidx $rowlaidout $rowoptim $numcommits \
+		     $linesegends $leftover $commfd]
+	    fileevent $commfd readable {}
+	} elseif {![info exists viewdata($curview)]
+		  || [lindex $viewdata($curview) 0] ne {}} {
+	    set viewdata($curview) \
+		[list {} $displayorder $parentlist $childlist $rowidlist \
+		     $rowoffsets $rowrangelist $commitlisted]
+	}
+    }
+    catch {unset matchinglines}
+    catch {unset treediffs}
+    clear_display
+
+    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 [lindex $v 1]
+    set parentlist [lindex $v 2]
+    set childlist [lindex $v 3]
+    set rowidlist [lindex $v 4]
+    set rowoffsets [lindex $v 5]
+    set rowrangelist [lindex $v 6]
+    set commitlisted [lindex $v 7]
+    if {$phase eq {}} {
+	set numcommits [llength $displayorder]
+	catch {unset idrowranges}
+	catch {unset children}
+    } else {
+	unflatten children [lindex $v 8]
+	unflatten idrowranges [lindex $v 9]
+	unflatten idinlist [lindex $v 10]
+	set commitidx [lindex $v 11]
+	set rowlaidout [lindex $v 12]
+	set rowoptim [lindex $v 13]
+	set numcommits [lindex $v 14]
+	set linesegends [lindex $v 15]
+	set leftover [lindex $v 16]
+	set commfd [lindex $v 17]
+	fileevent $commfd readable [list getcommitlines $commfd]
+	set nextupdate [expr {[clock clicks -milliseconds] + 100}]
+    }
+
+    catch {unset colormap}
+    catch {unset rowtextx}
+    catch {unset commitrow}
+    set curview $n
+    set row 0
+    foreach id $displayorder {
+	set commitrow($id) $row
+	incr row
+    }
+    setcanvscroll
+    set yf 0
+    set row 0
+    if {$selid ne {} && [info exists commitrow($selid)]} {
+	set row $commitrow($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 eq {}} {
+	global maincursor textcursor
+	. config -cursor $maincursor
+	settextcursor $textcursor
+    } else {
+	. config -cursor watch
+	settextcursor watch
+	if {$phase eq "getcommits"} {
+	    global mainfont
+	    $canv create text 3 3 -anchor nw -text "Reading commits..." \
+		-font $mainfont -tags textitems
+	}
+    }
+}
+
 proc shortids {ids} {
     set res {}
     foreach id $ids {
@@ -751,20 +1121,21 @@ proc ntimes {n o} {
 }
 
 proc usedinrange {id l1 l2} {
-    global children commitrow
+    global children commitrow childlist
 
     if {[info exists commitrow($id)]} {
 	set r $commitrow($id)
 	if {$l1 <= $r && $r <= $l2} {
 	    return [expr {$r - $l1 + 1}]
 	}
+	set kids [lindex $childlist $r]
+    } else {
+	set kids $children($id)
     }
-    foreach c $children($id) {
-	if {[info exists commitrow($c)]} {
-	    set r $commitrow($c)
-	    if {$l1 <= $r && $r <= $l2} {
-		return [expr {$r - $l1 + 1}]
-	    }
+    foreach c $kids {
+	set r $commitrow($c)
+	if {$l1 <= $r && $r <= $l2} {
+	    return [expr {$r - $l1 + 1}]
 	}
     }
     return 0
@@ -830,15 +1201,23 @@ proc makeuparrow {oid x y z} {
 }
 
 proc initlayout {} {
-    global rowidlist rowoffsets displayorder
+    global rowidlist rowoffsets displayorder commitlisted
     global rowlaidout rowoptim
-    global idinlist rowchk
-    global commitidx numcommits
+    global idinlist rowchk rowrangelist idrowranges
+    global commitidx numcommits canvxmax canv
     global nextcolor
+    global parentlist childlist children
+    global colormap rowtextx commitrow
+    global linesegends
 
     set commitidx 0
     set numcommits 0
     set displayorder {}
+    set commitlisted {}
+    set parentlist {}
+    set childlist {}
+    set rowrangelist {}
+    catch {unset children}
     set nextcolor 0
     set rowidlist {{}}
     set rowoffsets {{}}
@@ -846,6 +1225,21 @@ proc initlayout {} {
     catch {unset rowchk}
     set rowlaidout 0
     set rowoptim 0
+    set canvxmax [$canv cget -width]
+    catch {unset colormap}
+    catch {unset rowtextx}
+    catch {unset commitrow}
+    catch {unset idrowranges}
+    set linesegends {}
+}
+
+proc setcanvscroll {} {
+    global canv canv2 canv3 numcommits linespc canvxmax canvy0
+
+    set ymax [expr {$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 {} {
@@ -875,7 +1269,6 @@ proc layoutmore {} {
     set rowlaidout [layoutrows $row $commitidx 0]
     set orow [expr {$rowlaidout - $uparrowlen - 1}]
     if {$orow > $rowoptim} {
-	checkcrossings $rowoptim $orow
 	optimize_rows $rowoptim 0 $orow
 	set rowoptim $orow
     }
@@ -886,8 +1279,7 @@ proc layoutmore {} {
 }
 
 proc showstuff {canshow} {
-    global numcommits
-    global canvy0 linespc
+    global numcommits commitrow pending_select selectedline
     global linesegends idrowranges idrangedrawn
 
     if {$numcommits == 0} {
@@ -897,22 +1289,20 @@ proc showstuff {canshow} {
     }
     set row $numcommits
     set numcommits $canshow
-    allcanvs conf -scrollregion \
-	[list 0 0 0 [expr {$canvy0 + ($numcommits - 0.5) * $linespc + 2}]]
+    setcanvscroll
     set rows [visiblerows]
     set r0 [lindex $rows 0]
     set r1 [lindex $rows 1]
+    set selrow -1
     for {set r $row} {$r < $canshow} {incr r} {
-	if {[info exists linesegends($r)]} {
-	    foreach id $linesegends($r) {
-		set i -1
-		foreach {s e} $idrowranges($id) {
-		    incr i
-		    if {$e ne {} && $e < $numcommits && $s <= $r1 && $e >= $r0
-			&& ![info exists idrangedrawn($id,$i)]} {
-			drawlineseg $id $i
-			set idrangedrawn($id,$i) 1
-		    }
+	foreach id [lindex $linesegends [expr {$r+1}]] {
+	    set i -1
+	    foreach {s e} [rowranges $id] {
+		incr i
+		if {$e ne {} && $e < $numcommits && $s <= $r1 && $e >= $r0
+		    && ![info exists idrangedrawn($id,$i)]} {
+		    drawlineseg $id $i
+		    set idrangedrawn($id,$i) 1
 		}
 	    }
 	}
@@ -924,15 +1314,23 @@ proc showstuff {canshow} {
 	drawcmitrow $row
 	incr row
     }
+    if {[info exists pending_select] &&
+	[info exists commitrow($pending_select)] &&
+	$commitrow($pending_select) < $numcommits} {
+	selectline $commitrow($pending_select) 1
+    }
+    if {![info exists selectedline] && ![info exists pending_select]} {
+	selectline 0 1
+    }
 }
 
 proc layoutrows {row endrow last} {
     global rowidlist rowoffsets displayorder
     global uparrowlen downarrowlen maxwidth mingaplen
-    global nchildren parents nparents
+    global childlist parentlist
     global idrowranges linesegends
     global commitidx
-    global idinlist rowchk
+    global idinlist rowchk rowrangelist
 
     set idlist [lindex $rowidlist $row]
     set offs [lindex $rowoffsets $row]
@@ -940,13 +1338,14 @@ proc layoutrows {row endrow last} {
 	set id [lindex $displayorder $row]
 	set oldolds {}
 	set newolds {}
-	foreach p $parents($id) {
+	foreach p [lindex $parentlist $row] {
 	    if {![info exists idinlist($p)]} {
 		lappend newolds $p
 	    } elseif {!$idinlist($p)} {
 		lappend oldolds $p
 	    }
 	}
+	set lse {}
 	set nev [expr {[llength $idlist] + [llength $newolds]
 		       + [llength $oldolds] - $maxwidth + 1}]
 	if {$nev > 0} {
@@ -962,7 +1361,7 @@ proc layoutrows {row endrow last} {
 			set offs [incrange $offs $x 1]
 			set idinlist($i) 0
 			set rm1 [expr {$row - 1}]
-			lappend linesegends($rm1) $i
+			lappend lse $i
 			lappend idrowranges($i) $rm1
 			if {[incr nev -1] <= 0} break
 			continue
@@ -973,13 +1372,14 @@ proc layoutrows {row endrow last} {
 	    lset rowidlist $row $idlist
 	    lset rowoffsets $row $offs
 	}
+	lappend linesegends $lse
 	set col [lsearch -exact $idlist $id]
 	if {$col < 0} {
 	    set col [llength $idlist]
 	    lappend idlist $id
 	    lset rowidlist $row $idlist
 	    set z {}
-	    if {$nchildren($id) > 0} {
+	    if {[lindex $childlist $row] ne {}} {
 		set z [expr {[llength [lindex $rowidlist [expr {$row-1}]]] - $col}]
 		unset idinlist($id)
 	    }
@@ -991,9 +1391,13 @@ proc layoutrows {row endrow last} {
 	} else {
 	    unset idinlist($id)
 	}
+	set ranges {}
 	if {[info exists idrowranges($id)]} {
-	    lappend idrowranges($id) $row
+	    set ranges $idrowranges($id)
+	    lappend ranges $row
+	    unset idrowranges($id)
 	}
+	lappend rowrangelist $ranges
 	incr row
 	set offs [ntimes [llength $idlist] 0]
 	set l [llength $newolds]
@@ -1032,22 +1436,30 @@ proc layoutrows {row endrow last} {
 }
 
 proc addextraid {id row} {
-    global displayorder commitrow commitinfo nparents
-    global commitidx
+    global displayorder commitrow commitinfo
+    global commitidx commitlisted
+    global parentlist childlist children
 
     incr commitidx
     lappend displayorder $id
+    lappend commitlisted 0
+    lappend parentlist {}
     set commitrow($id) $row
     readcommit $id
     if {![info exists commitinfo($id)]} {
 	set commitinfo($id) {"No commit information available"}
-	set nparents($id) 0
+    }
+    if {[info exists children($id)]} {
+	lappend childlist $children($id)
+	unset children($id)
+    } else {
+	lappend childlist {}
     }
 }
 
 proc layouttail {} {
     global rowidlist rowoffsets idinlist commitidx
-    global idrowranges
+    global idrowranges rowrangelist
 
     set row $commitidx
     set idlist [lindex $rowidlist $row]
@@ -1057,6 +1469,8 @@ proc layouttail {} {
 	addextraid $id $row
 	unset idinlist($id)
 	lappend idrowranges($id) $row
+	lappend rowrangelist $idrowranges($id)
+	unset idrowranges($id)
 	incr row
 	set offs [ntimes $col 0]
 	set idlist [lreplace $idlist $col $col]
@@ -1070,6 +1484,8 @@ proc layouttail {} {
 	lset rowoffsets $row 0
 	makeuparrow $id 0 $row 0
 	lappend idrowranges($id) $row
+	lappend rowrangelist $idrowranges($id)
+	unset idrowranges($id)
 	incr row
 	lappend rowidlist {}
 	lappend rowoffsets {}
@@ -1086,23 +1502,12 @@ proc insert_pad {row col npad} {
 }
 
 proc optimize_rows {row col endrow} {
-    global rowidlist rowoffsets idrowranges linesegends displayorder
+    global rowidlist rowoffsets idrowranges displayorder
 
     for {} {$row < $endrow} {incr row} {
 	set idlist [lindex $rowidlist $row]
 	set offs [lindex $rowoffsets $row]
 	set haspad 0
-	set downarrowcols {}
-	if {[info exists linesegends($row)]} {
-	    set downarrowcols $linesegends($row)
-	    if {$col > 0} {
-		while {$downarrowcols ne {}} {
-		    set i [lsearch -exact $idlist [lindex $downarrowcols 0]]
-		    if {$i < 0 || $i >= $col} break
-		    set downarrowcols [lrange $downarrowcols 1 end]
-		}
-	    }
-	}
 	for {} {$col < [llength $offs]} {incr col} {
 	    if {[lindex $idlist $col] eq {}} {
 		set haspad 1
@@ -1116,14 +1521,10 @@ proc optimize_rows {row col endrow} {
 	    set z0 [lindex $rowoffsets $y0 $x0]
 	    if {$z0 eq {}} {
 		set id [lindex $idlist $col]
-		if {[info exists idrowranges($id)] &&
-		    $y0 > [lindex $idrowranges($id) 0]} {
+		set ranges [rowranges $id]
+		if {$ranges ne {} && $y0 > [lindex $ranges 0]} {
 		    set isarrow 1
 		}
-	    } elseif {$downarrowcols ne {} &&
-		      [lindex $idlist $col] eq [lindex $downarrowcols 0]} {
-		set downarrowcols [lrange $downarrowcols 1 end]
-		set isarrow 1
 	    }
 	    if {$z < -1 || ($z < 0 && $isarrow)} {
 		set npad [expr {-1 - $z + $isarrow}]
@@ -1179,8 +1580,8 @@ proc optimize_rows {row col endrow} {
 		if {$o eq {}} {
 		    # check if this is the link to the first child
 		    set id [lindex $idlist $col]
-		    if {[info exists idrowranges($id)] &&
-			$row == [lindex $idrowranges($id) 0]} {
+		    set ranges [rowranges $id]
+		    if {$ranges ne {} && $row == [lindex $ranges 0]} {
 			# it is, work out offset to child
 			set y0 [expr {$row - 1}]
 			set id [lindex $displayorder $y0]
@@ -1234,13 +1635,34 @@ proc linewidth {id} {
     return $wid
 }
 
+proc rowranges {id} {
+    global phase idrowranges commitrow rowlaidout rowrangelist
+
+    set ranges {}
+    if {$phase eq {} ||
+	([info exists commitrow($id)] && $commitrow($id) < $rowlaidout)} {
+	set ranges [lindex $rowrangelist $commitrow($id)]
+    } elseif {[info exists idrowranges($id)]} {
+	set ranges $idrowranges($id)
+    }
+    return $ranges
+}
+
 proc drawlineseg {id i} {
-    global rowoffsets rowidlist idrowranges
+    global rowoffsets rowidlist
     global displayorder
-    global canv colormap
+    global canv colormap linespc
+    global numcommits commitrow
 
-    set startrow [lindex $idrowranges($id) [expr {2 * $i}]]
-    set row [lindex $idrowranges($id) [expr {2 * $i + 1}]]
+    set ranges [rowranges $id]
+    set downarrow 1
+    if {[info exists commitrow($id)] && $commitrow($id) < $numcommits} {
+	set downarrow [expr {$i < [llength $ranges] / 2 - 1}]
+    } else {
+	set downarrow 1
+    }
+    set startrow [lindex $ranges [expr {2 * $i}]]
+    set row [lindex $ranges [expr {2 * $i + 1}]]
     if {$startrow == $row} return
     assigncolor $id
     set coords {}
@@ -1284,8 +1706,27 @@ proc drawlineseg {id i} {
 	}
     }
     if {[llength $coords] < 4} return
-    set last [expr {[llength $idrowranges($id)] / 2 - 1}]
-    set arrow [expr {2 * ($i > 0) + ($i < $last)}]
+    if {$downarrow} {
+	# This line has an arrow at the lower end: check if the arrow is
+	# on a diagonal segment, and if so, work around the Tk 8.4
+	# refusal to draw arrows on diagonal lines.
+	set x0 [lindex $coords 0]
+	set x1 [lindex $coords 2]
+	if {$x0 != $x1} {
+	    set y0 [lindex $coords 1]
+	    set y1 [lindex $coords 3]
+	    if {$y0 - $y1 <= 2 * $linespc && $x1 == [lindex $coords 4]} {
+		# we have a nearby vertical segment, just trim off the diag bit
+		set coords [lrange $coords 2 end]
+	    } else {
+		set slope [expr {($x0 - $x1) / ($y0 - $y1)}]
+		set xi [expr {$x0 - $slope * $linespc / 2}]
+		set yi [expr {$y0 - $linespc / 2}]
+		set coords [lreplace $coords 0 1 $xi $y0 $xi $yi]
+	    }
+	}
+    }
+    set arrow [expr {2 * ($i > 0) + $downarrow}]
     set arrow [lindex {none first last both} $arrow]
     set t [$canv create line $coords -width [linewidth $id] \
 	       -fill $colormap($id) -tags lines.$id -arrow $arrow]
@@ -1294,7 +1735,7 @@ proc drawlineseg {id i} {
 }
 
 proc drawparentlinks {id row col olds} {
-    global rowidlist canv colormap idrowranges
+    global rowidlist canv colormap
 
     set row2 [expr {$row + 1}]
     set x [xc $row $col]
@@ -1313,9 +1754,9 @@ proc drawparentlinks {id row col olds} {
 	if {$x2 > $rmx} {
 	    set rmx $x2
 	}
-	if {[info exists idrowranges($p)] &&
-	    $row2 == [lindex $idrowranges($p) 0] &&
-	    $row2 < [lindex $idrowranges($p) 1]} {
+	set ranges [rowranges $p]
+	if {$ranges ne {} && $row2 == [lindex $ranges 0]
+	    && $row2 < [lindex $ranges 1]} {
 	    # drawlineseg will do this one for us
 	    continue
 	}
@@ -1338,24 +1779,22 @@ proc drawparentlinks {id row col olds} {
 
 proc drawlines {id} {
     global colormap canv
-    global idrowranges idrangedrawn
-    global children iddrawn commitrow rowidlist
+    global idrangedrawn
+    global childlist iddrawn commitrow rowidlist
 
     $canv delete lines.$id
-    set nr [expr {[llength $idrowranges($id)] / 2}]
+    set nr [expr {[llength [rowranges $id]] / 2}]
     for {set i 0} {$i < $nr} {incr i} {
 	if {[info exists idrangedrawn($id,$i)]} {
 	    drawlineseg $id $i
 	}
     }
-    if {[info exists children($id)]} {
-	foreach child $children($id) {
-	    if {[info exists iddrawn($child)]} {
-		set row $commitrow($child)
-		set col [lsearch -exact [lindex $rowidlist $row] $child]
-		if {$col >= 0} {
-		    drawparentlinks $child $row $col [list $id]
-		}
+    foreach child [lindex $childlist $commitrow($id)] {
+	if {[info exists iddrawn($child)]} {
+	    set row $commitrow($child)
+	    set col [lsearch -exact [lindex $rowidlist $row] $child]
+	    if {$col >= 0} {
+		drawparentlinks $child $row $col [list $id]
 	    }
 	}
     }
@@ -1366,9 +1805,9 @@ proc drawcmittext {id row col rmx} {
     global commitlisted commitinfo rowidlist
     global rowtextx idpos idtags idheads idotherrefs
     global linehtag linentag linedtag
-    global mainfont namefont
+    global mainfont namefont canvxmax
 
-    set ofill [expr {[info exists commitlisted($id)]? "blue": "white"}]
+    set ofill [expr {[lindex $commitlisted $row]? "blue": "white"}]
     set x [xc $row $col]
     set y [yc $row]
     set orad [expr {$linespc / 3}]
@@ -1398,18 +1837,23 @@ proc drawcmittext {id row col rmx} {
 			    -text $name -font $namefont]
     set linedtag($row) [$canv3 create text 3 $y -anchor w \
 			    -text $date -font $mainfont]
+    set xr [expr {$xt + [font measure $mainfont $headline]}]
+    if {$xr > $canvxmax} {
+	set canvxmax $xr
+	setcanvscroll
+    }
 }
 
 proc drawcmitrow {row} {
     global displayorder rowidlist
-    global idrowranges idrangedrawn iddrawn
-    global commitinfo commitlisted parents numcommits
+    global idrangedrawn iddrawn
+    global commitinfo parentlist numcommits
 
     if {$row >= $numcommits} return
     foreach id [lindex $rowidlist $row] {
-	if {![info exists idrowranges($id)]} continue
+	if {$id eq {}} continue
 	set i -1
-	foreach {s e} $idrowranges($id) {
+	foreach {s e} [rowranges $id] {
 	    incr i
 	    if {$row < $s} continue
 	    if {$e eq {}} break
@@ -1434,9 +1878,9 @@ proc drawcmitrow {row} {
 	getcommit $id
     }
     assigncolor $id
-    if {[info exists commitlisted($id)] && [info exists parents($id)]
-	&& $parents($id) ne {}} {
-	set rmx [drawparentlinks $id $row $col $parents($id)]
+    set olds [lindex $parentlist $row]
+    if {$olds ne {}} {
+	set rmx [drawparentlinks $id $row $col $olds]
     } else {
 	set rmx 0
     }
@@ -1478,60 +1922,95 @@ proc clear_display {} {
     catch {unset idrangedrawn}
 }
 
+proc findcrossings {id} {
+    global rowidlist parentlist numcommits rowoffsets displayorder
+
+    set cross {}
+    set ccross {}
+    foreach {s e} [rowranges $id] {
+	if {$e >= $numcommits} {
+	    set e [expr {$numcommits - 1}]
+	}
+	if {$e <= $s} continue
+	set x [lsearch -exact [lindex $rowidlist $e] $id]
+	if {$x < 0} {
+	    puts "findcrossings: oops, no [shortids $id] in row $e"
+	    continue
+	}
+	for {set row $e} {[incr row -1] >= $s} {} {
+	    set olds [lindex $parentlist $row]
+	    set kid [lindex $displayorder $row]
+	    set kidx [lsearch -exact [lindex $rowidlist $row] $kid]
+	    if {$kidx < 0} continue
+	    set nextrow [lindex $rowidlist [expr {$row + 1}]]
+	    foreach p $olds {
+		set px [lsearch -exact $nextrow $p]
+		if {$px < 0} continue
+		if {($kidx < $x && $x < $px) || ($px < $x && $x < $kidx)} {
+		    if {[lsearch -exact $ccross $p] >= 0} continue
+		    if {$x == $px + ($kidx < $px? -1: 1)} {
+			lappend ccross $p
+		    } elseif {[lsearch -exact $cross $p] < 0} {
+			lappend cross $p
+		    }
+		}
+	    }
+	    set inc [lindex $rowoffsets $row $x]
+	    if {$inc eq {}} break
+	    incr x $inc
+	}
+    }
+    return [concat $ccross {{}} $cross]
+}
+
 proc assigncolor {id} {
     global colormap colors nextcolor
-    global parents nparents children nchildren
-    global cornercrossings crossings
+    global commitrow parentlist children childlist
 
     if {[info exists colormap($id)]} return
     set ncolors [llength $colors]
-    if {$nchildren($id) == 1} {
-	set child [lindex $children($id) 0]
+    if {[info exists commitrow($id)]} {
+	set kids [lindex $childlist $commitrow($id)]
+    } elseif {[info exists children($id)]} {
+	set kids $children($id)
+    } else {
+	set kids {}
+    }
+    if {[llength $kids] == 1} {
+	set child [lindex $kids 0]
 	if {[info exists colormap($child)]
-	    && $nparents($child) == 1} {
+	    && [llength [lindex $parentlist $commitrow($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)
-	    }
+    set origbad {}
+    foreach x [findcrossings $id] {
+	if {$x eq {}} {
+	    # delimiter between corner crossings and other crossings
+	    if {[llength $badcolors] >= $ncolors - 1} break
+	    set origbad $badcolors
 	}
-	if {[llength $badcolors] >= $ncolors} {
-	    set badcolors {}
+	if {[info exists colormap($x)]
+	    && [lsearch -exact $badcolors $colormap($x)] < 0} {
+	    lappend badcolors $colormap($x)
 	}
     }
-    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} {
+	set badcolors $origbad
     }
+    set origbad $badcolors
     if {[llength $badcolors] < $ncolors - 1} {
-	foreach child $children($id) {
+	foreach child $kids {
 	    if {[info exists colormap($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)
-		    }
+	    foreach p [lindex $parentlist $commitrow($child)] {
+		if {[info exists colormap($p)]
+		    && [lsearch -exact $badcolors $colormap($p)] < 0} {
+		    lappend badcolors $colormap($p)
 		}
 	    }
 	}
@@ -1615,6 +2094,14 @@ proc drawtags {id x xt y1} {
 	    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
+	    if {[regexp {^(remotes/.*/|remotes/)} $tag match remoteprefix]} {
+	        set rwid [font measure $mainfont $remoteprefix]
+		set xi [expr {$x + 1}]
+		set yti [expr {$yt + 1}]
+		set xri [expr {$x + $rwid}]
+		$canv create polygon $xi $yti $xri $yti $xri $yb $xi $yb \
+			-width 0 -fill "#ffddaa" -tags tag.$id
+	    }
 	}
 	set t [$canv create text $xl $y1 -anchor w -text $tag \
 		   -font $mainfont -tags tag.$id]
@@ -1625,55 +2112,6 @@ proc drawtags {id x xt y1} {
     return $xt
 }
 
-proc checkcrossings {row endrow} {
-    global displayorder parents rowidlist
-
-    for {} {$row < $endrow} {incr row} {
-	set id [lindex $displayorder $row]
-	set i [lsearch -exact [lindex $rowidlist $row] $id]
-	if {$i < 0} continue
-	set idlist [lindex $rowidlist [expr {$row+1}]]
-	foreach p $parents($id) {
-	    set j [lsearch -exact $idlist $p]
-	    if {$j > 0} {
-		if {$j < $i - 1} {
-		    notecrossings $row $p $j $i [expr {$j+1}]
-		} elseif {$j > $i + 1} {
-		    notecrossings $row $p $i $j [expr {$j-1}]
-		}
-	    }
-	}
-    }
-}
-
-proc notecrossings {row id lo hi corner} {
-    global rowidlist crossings cornercrossings
-
-    for {set i $lo} {[incr i] < $hi} {} {
-	set p [lindex [lindex $rowidlist $row] $i]
-	if {$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
 
@@ -1689,7 +2127,7 @@ proc xcoord {i level ln} {
 proc finishcommits {} {
     global commitidx phase
     global canv mainfont ctext maincursor textcursor
-    global findinprogress
+    global findinprogress pending_select
 
     if {$commitidx > 0} {
 	drawrest
@@ -1703,6 +2141,7 @@ proc finishcommits {} {
 	settextcursor $textcursor
     }
     set phase {}
+    catch {unset pending_select}
 }
 
 # Don't change the text pane cursor if it is currently the hand cursor,
@@ -1721,12 +2160,16 @@ proc drawrest {} {
     global startmsecs
     global canvy0 numcommits linespc
     global rowlaidout commitidx
+    global pending_select
 
     set row $rowlaidout
     layoutrows $rowlaidout $commitidx 1
     layouttail
     optimize_rows $row 0 $commitidx
     showstuff $commitidx
+    if {[info exists pending_select]} {
+	selectline 0 1
+    }
 
     set drawmsecs [expr {[clock clicks -milliseconds] - $startmsecs}]
     #puts "overall $drawmsecs ms for $numcommits commits"
@@ -1916,7 +2359,7 @@ proc stopfindproc {{done 0}} {
     }
     if {[info exists findinprogress]} {
 	unset findinprogress
-	if {$phase != "incrdraw"} {
+	if {$phase eq {}} {
 	    . config -cursor $maincursor
 	    settextcursor $textcursor
 	}
@@ -2015,7 +2458,7 @@ proc insertmatch {l id} {
 
 proc findfiles {} {
     global selectedline numcommits displayorder ctext
-    global ffileline finddidsel parents nparents
+    global ffileline finddidsel parentlist
     global findinprogress findstartline findinsertpos
     global treediffs fdiffid fdiffsneeded fdiffpos
     global findmergefiles
@@ -2033,7 +2476,7 @@ proc findfiles {} {
     set fdiffsneeded {}
     while 1 {
 	set id [lindex $displayorder $l]
-	if {$findmergefiles || $nparents($id) == 1} {
+	if {$findmergefiles || [llength [lindex $parentlist $l]] == 1} {
 	    if {![info exists treediffs($id)]} {
 		append diffsneeded "$id\n"
 		lappend fdiffsneeded $id
@@ -2065,7 +2508,7 @@ proc findfiles {} {
     . config -cursor watch
     settextcursor watch
     set findinprogress 1
-    findcont $id
+    findcont
     update
 }
 
@@ -2112,7 +2555,7 @@ proc donefilediff {} {
 	    set treediffs($nullid) {}
 	    if {[info exists findid] && $nullid eq $findid} {
 		unset findid
-		findcont $nullid
+		findcont
 	    }
 	    incr fdiffpos
 	}
@@ -2123,20 +2566,21 @@ proc donefilediff {} {
 	}
 	if {[info exists findid] && $fdiffid eq $findid} {
 	    unset findid
-	    findcont $fdiffid
+	    findcont
 	}
     }
 }
 
-proc findcont {id} {
-    global findid treediffs parents nparents
+proc findcont {} {
+    global findid treediffs parentlist
     global ffileline findstartline finddidsel
     global displayorder numcommits matchinglines findinprogress
     global findmergefiles
 
     set l $ffileline
-    while 1 {
-	if {$findmergefiles || $nparents($id) == 1} {
+    while {1} {
+	set id [lindex $displayorder $l]
+	if {$findmergefiles || [llength [lindex $parentlist $l]] == 1} {
 	    if {![info exists treediffs($id)]} {
 		set findid $id
 		set ffileline $l
@@ -2158,7 +2602,6 @@ proc findcont {id} {
 	    set l 0
 	}
 	if {$l == $findstartline} break
-	set id [lindex $displayorder $l]
     }
     stopfindproc
     if {!$finddidsel} {
@@ -2255,14 +2698,31 @@ proc appendwithlinks {text} {
     $ctext tag bind link <Leave> { %W configure -cursor $curtextcursor }
 }
 
+proc viewnextline {dir} {
+    global canv linespc
+
+    $canv delete hover
+    set ymax [lindex [$canv cget -scrollregion] 3]
+    set wnow [$canv yview]
+    set wtop [expr {[lindex $wnow 0] * $ymax}]
+    set newtop [expr {$wtop + $dir * $linespc}]
+    if {$newtop < 0} {
+	set newtop 0
+    } elseif {$newtop > $ymax} {
+	set newtop $ymax
+    }
+    allcanvs yview moveto [expr {$newtop * 1.0 / $ymax}]
+}
+
 proc selectline {l isnew} {
     global canv canv2 canv3 ctext commitinfo selectedline
     global displayorder linehtag linentag linedtag
-    global canvy0 linespc parents nparents children
+    global canvy0 linespc parentlist childlist
     global cflist currentid sha1entry
     global commentend idtags linknum
-    global mergemax numcommits
+    global mergemax numcommits pending_select
 
+    catch {unset pending_select}
     $canv delete hover
     normalline
     if {$l < 0 || $l >= $numcommits} return
@@ -2348,9 +2808,10 @@ proc selectline {l isnew} {
     }
  
     set comment {}
-    if {$nparents($id) > 1} {
+    set olds [lindex $parentlist $l]
+    if {[llength $olds] > 1} {
 	set np 0
-	foreach p $parents($id) {
+	foreach p $olds {
 	    if {$np >= $mergemax} {
 		set tag mmax
 	    } else {
@@ -2361,17 +2822,13 @@ proc selectline {l isnew} {
 	    incr np
 	}
     } else {
-	if {[info exists parents($id)]} {
-	    foreach p $parents($id) {
-		append comment "Parent: [commit_descriptor $p]\n"
-	    }
+	foreach p $olds {
+	    append comment "Parent: [commit_descriptor $p]\n"
 	}
     }
 
-    if {[info exists children($id)]} {
-	foreach c $children($id) {
-	    append comment "Child:  [commit_descriptor $c]\n"
-	}
+    foreach c [lindex $childlist $l] {
+	append comment "Child:  [commit_descriptor $c]\n"
     }
     append comment "\n"
     append comment [lindex $info 5]
@@ -2386,13 +2843,25 @@ proc selectline {l isnew} {
 
     $cflist delete 0 end
     $cflist insert end "Comments"
-    if {$nparents($id) <= 1} {
+    if {[llength $olds] <= 1} {
 	startdiff $id
     } else {
-	mergediff $id
+	mergediff $id $l
     }
 }
 
+proc selfirstline {} {
+    unmarkmatches
+    selectline 0 1
+}
+
+proc sellastline {} {
+    global numcommits
+    unmarkmatches
+    set l [expr {$numcommits - 1}]
+    selectline $l 1
+}
+
 proc selnextline {dir} {
     global selectedline
     if {![info exists selectedline]} return
@@ -2401,25 +2870,46 @@ proc selnextline {dir} {
     selectline $l 1
 }
 
+proc selnextpage {dir} {
+    global canv linespc selectedline numcommits
+
+    set lpp [expr {([winfo height $canv] - 2) / $linespc}]
+    if {$lpp < 1} {
+	set lpp 1
+    }
+    allcanvs yview scroll [expr {$dir * $lpp}] units
+    if {![info exists selectedline]} return
+    set l [expr {$selectedline + $dir * $lpp}]
+    if {$l < 0} {
+	set l 0
+    } elseif {$l >= $numcommits} {
+        set l [expr $numcommits - 1]
+    }
+    unmarkmatches
+    selectline $l 1    
+}
+
 proc unselectline {} {
-    global selectedline
+    global selectedline currentid
 
     catch {unset selectedline}
+    catch {unset currentid}
     allcanvs delete secsel
 }
 
 proc addtohistory {cmd} {
-    global history historyindex
+    global history historyindex curview
 
+    set elt [list $curview $cmd]
     if {$historyindex > 0
-	&& [lindex $history [expr {$historyindex - 1}]] == $cmd} {
+	&& [lindex $history [expr {$historyindex - 1}]] == $elt} {
 	return
     }
 
     if {$historyindex < [llength $history]} {
-	set history [lreplace $history $historyindex end $cmd]
+	set history [lreplace $history $historyindex end $elt]
     } else {
-	lappend history $cmd
+	lappend history $elt
     }
     incr historyindex
     if {$historyindex > 1} {
@@ -2430,13 +2920,23 @@ proc addtohistory {cmd} {
     .ctop.top.bar.rightbut conf -state disabled
 }
 
+proc godo {elt} {
+    global curview
+
+    set view [lindex $elt 0]
+    set cmd [lindex $elt 1]
+    if {$curview != $view} {
+	showview $view
+    }
+    eval $cmd
+}
+
 proc goback {} {
     global history historyindex
 
     if {$historyindex > 1} {
 	incr historyindex -1
-	set cmd [lindex $history [expr {$historyindex - 1}]]
-	eval $cmd
+	godo [lindex $history [expr {$historyindex - 1}]]
 	.ctop.top.bar.rightbut conf -state normal
     }
     if {$historyindex <= 1} {
@@ -2450,7 +2950,7 @@ proc goforw {} {
     if {$historyindex < [llength $history]} {
 	set cmd [lindex $history $historyindex]
 	incr historyindex
-	eval $cmd
+	godo $cmd
 	.ctop.top.bar.leftbut conf -state normal
     }
     if {$historyindex >= [llength $history]} {
@@ -2458,9 +2958,10 @@ proc goforw {} {
     }
 }
 
-proc mergediff {id} {
-    global parents diffmergeid diffopts mdifffd
+proc mergediff {id l} {
+    global diffmergeid diffopts mdifffd
     global difffilestart diffids
+    global parentlist
 
     set diffmergeid $id
     set diffids $id
@@ -2474,12 +2975,13 @@ proc mergediff {id} {
     }
     fconfigure $mdf -blocking 0
     set mdifffd($id) $mdf
-    fileevent $mdf readable [list getmergediffline $mdf $id]
+    set np [llength [lindex $parentlist $l]]
+    fileevent $mdf readable [list getmergediffline $mdf $id $np]
     set nextupdate [expr {[clock clicks -milliseconds] + 100}]
 }
 
-proc getmergediffline {mdf id} {
-    global diffmergeid ctext cflist nextupdate nparents mergemax
+proc getmergediffline {mdf id np} {
+    global diffmergeid ctext cflist nextupdate mergemax
     global difffilestart mdifffd
 
     set n [gets $mdf line]
@@ -2512,7 +3014,6 @@ proc getmergediffline {mdf id} {
 	# do nothing
     } else {
 	# parse the prefix - one ' ', '-' or '+' for each parent
-	set np $nparents($id)
 	set spaces {}
 	set minuses {}
 	set pluses {}
@@ -2553,7 +3054,7 @@ proc getmergediffline {mdf id} {
 	incr nextupdate 100
 	fileevent $mdf readable {}
 	update
-	fileevent $mdf readable [list getmergediffline $mdf $id]
+	fileevent $mdf readable [list getmergediffline $mdf $id $np]
     }
 }
 
@@ -2580,7 +3081,7 @@ proc addtocflist {ids} {
 }
 
 proc gettreediffs {ids} {
-    global treediff parents treepending
+    global treediff treepending
     set treepending $ids
     set treediff {}
     if {[catch \
@@ -2757,15 +3258,14 @@ proc setcoords {} {
 }
 
 proc redisplay {} {
-    global canv canvy0 linespc numcommits
+    global canv
     global selectedline
 
     set ymax [lindex [$canv cget -scrollregion] 3]
     if {$ymax eq {} || $ymax == 0} return
     set span [$canv yview]
     clear_display
-    allcanvs conf -scrollregion \
-	[list 0 0 0 [expr {$canvy0 + ($numcommits - 0.5) * $linespc + 2}]]
+    setcanvscroll
     allcanvs yview moveto [lindex $span 0]
     drawvisible
     if {[info exists selectedline]} {
@@ -2786,7 +3286,7 @@ proc incrfont {inc} {
     foreach e $entries {
 	$e conf -font $mainfont
     }
-    if {$phase == "getcommits"} {
+    if {$phase eq "getcommits"} {
 	$canv itemconf textitems -font $mainfont
     }
     redisplay
@@ -2816,13 +3316,15 @@ proc sha1change {n1 n2 op} {
 }
 
 proc gotocommit {} {
-    global sha1string currentid commitrow tagids
+    global sha1string currentid commitrow tagids headids
     global displayorder numcommits
 
     if {$sha1string == {}
 	|| ([info exists currentid] && $sha1string == $currentid)} return
     if {[info exists tagids($sha1string)]} {
 	set id $tagids($sha1string)
+    } elseif {[info exists headids($sha1string)]} {
+	set id $headids($sha1string)
     } else {
 	set id [string tolower $sha1string]
 	if {[regexp {^[0-9a-f]{4,39}$} $id]} {
@@ -2848,7 +3350,7 @@ proc gotocommit {} {
     if {[regexp {^[0-9a-fA-F]{4,}$} $sha1string]} {
 	set type "SHA1 id"
     } else {
-	set type "Tag"
+	set type "Tag/Head"
     }
     error_popup "$type $sha1string is not known"
 }
@@ -2917,12 +3419,13 @@ proc linehover {} {
 }
 
 proc clickisonarrow {id y} {
-    global lthickness idrowranges
+    global lthickness
 
+    set ranges [rowranges $id]
     set thresh [expr {2 * $lthickness + 6}]
-    set n [expr {[llength $idrowranges($id)] - 1}]
+    set n [expr {[llength $ranges] - 1}]
     for {set i 1} {$i < $n} {incr i} {
-	set row [lindex $idrowranges($id) $i]
+	set row [lindex $ranges $i]
 	if {abs([yc $row] - $y) < $thresh} {
 	    return $i
 	}
@@ -2931,11 +3434,11 @@ proc clickisonarrow {id y} {
 }
 
 proc arrowjump {id n y} {
-    global idrowranges canv
+    global canv
 
     # 1 <-> 2, 3 <-> 4, etc...
     set n [expr {(($n - 1) ^ 1) + 1}]
-    set row [lindex $idrowranges($id) $n]
+    set row [lindex [rowranges $id] $n]
     set yt [yc $row]
     set ymax [lindex [$canv cget -scrollregion] 3]
     if {$ymax eq {} || $ymax <= 0} return
@@ -2949,7 +3452,7 @@ proc arrowjump {id n y} {
 }
 
 proc lineclick {x y id isnew} {
-    global ctext commitinfo children cflist canv thickerline
+    global ctext commitinfo childlist commitrow cflist canv thickerline
 
     if {![info exists commitinfo($id)] && ![getcommit $id]} return
     unmarkmatches
@@ -2988,10 +3491,11 @@ proc lineclick {x y id isnew} {
     $ctext insert end "\tAuthor:\t[lindex $info 1]\n"
     set date [formatdate [lindex $info 2]]
     $ctext insert end "\tDate:\t$date\n"
-    if {[info exists children($id)]} {
+    set kids [lindex $childlist $commitrow($id)]
+    if {$kids ne {}} {
 	$ctext insert end "\nChildren:"
 	set i 0
-	foreach child $children($id) {
+	foreach child $kids {
 	    incr i
 	    if {![info exists commitinfo($child)] && ![getcommit $child]} continue
 	    set info $commitinfo($child)
@@ -3338,7 +3842,6 @@ proc listrefs {id} {
 
 proc rereadrefs {} {
     global idtags idheads idotherrefs
-    global tagids headids otherrefids
 
     set refids [concat [array names idtags] \
 		    [array names idheads] [array names idotherrefs]]
@@ -3747,6 +4250,7 @@ if {$tclencoding == {}} {
 
 set mainfont {Helvetica 9}
 set textfont {Courier 9}
+set uifont {Helvetica 9 bold}
 set findmergefiles 0
 set maxgraphpct 50
 set maxwidth 16
@@ -3787,10 +4291,53 @@ set historyindex 0
 
 set optim_delay 16
 
+set nextviewnum 1
+set curview 0
+set selectedview 0
+set viewfiles(0) {}
+set viewperm(0) 0
+
 set stopped 0
 set stuffsaved 0
 set patchnum 0
 setcoords
-makewindow $revtreeargs
+makewindow
 readrefs
-getcommits $revtreeargs
+
+set cmdline_files {}
+catch {
+    set fileargs [eval exec git-rev-parse --no-revs --no-flags $revtreeargs]
+    set cmdline_files [split $fileargs "\n"]
+    set n [llength $cmdline_files]
+    set revtreeargs [lrange $revtreeargs 0 end-$n]
+}
+if {[lindex $revtreeargs end] eq "--"} {
+    set revtreeargs [lrange $revtreeargs 0 end-1]
+}
+
+if {$cmdline_files ne {}} {
+    # create a view for the files/dirs specified on the command line
+    set curview 1
+    set selectedview 1
+    set nextviewnum 2
+    set viewname(1) "Command line"
+    set viewfiles(1) $cmdline_files
+    set viewperm(1) 0
+    .bar.view add radiobutton -label $viewname(1) -command {showview 1} \
+	-variable selectedview -value 1
+    .bar.view entryconf 2 -state normal
+    .bar.view entryconf 3 -state normal
+}
+
+if {[info exists permviews]} {
+    foreach v $permviews {
+	set n $nextviewnum
+	incr nextviewnum
+	set viewname($n) [lindex $v 0]
+	set viewfiles($n) [lindex $v 1]
+	set viewperm($n) 1
+	.bar.view add radiobutton -label $viewname($n) \
+	    -command [list showview $n] -variable selectedview -value $n
+    }
+}
+getcommits