Add commit row context menu and handle left-click on graph lines

Right-click on a context row now brings up a menu allowing the user to
generate a diff between that row and the selected row.  Left-click on
a graph line shows the parent and children connected by the line in
the details pane.  Left-click on a circle in the graph selects that
commit.  Left-click elsewhere in the graph does nothing.

When displaying a diff, the bottom-right file list box behaves
slightly differently now; instead of eliding all other files' diffs,
it now just scrolls the details pane so that the selected file's diff
starts at the top of the pane.

Since the diffs can be rather large, arrange for an update to be done
every 100ms while reading diffs.

Also removed the CVS revision keywords and bumped the version number
to 1.2.

1 files changed, 180 insertions, 86 deletions

diff --git a/gitk b/gitk
index faaffe1..779d71c 100755
--- a/gitk
+++ b/gitk
@@ -7,8 +7,6 @@ exec wish "$0" -- "${1+$@}"
 # and distributed under the terms of the GNU General Public Licence,
 # either version 2, or (at your option) any later version.
 
-# CVS $Revision: 1.24 $
-
 proc getcommits {rargs} {
     global commits commfd phase canv mainfont
     global startmsecs nextupdate
@@ -260,7 +258,7 @@ proc makewindow {} {
     global findtype findloc findstring fstring geometry
     global entries sha1entry sha1string sha1but
     global maincursor textcursor
-    global linectxmenu
+    global rowctxmenu
 
     menu .bar
     .bar add cascade -label "File" -menu .bar.file
@@ -366,8 +364,8 @@ proc makewindow {} {
 
     pack .ctop -side top -fill both -expand 1
 
-    bindall <1> {selcanvline %x %y}
-    bindall <B1-Motion> {selcanvline %x %y}
+    bindall <1> {selcanvline %W %x %y}
+    #bindall <B1-Motion> {selcanvline %W %x %y}
     bindall <ButtonRelease-4> "allcanvs yview scroll -5 units"
     bindall <ButtonRelease-5> "allcanvs yview scroll 5 units"
     bindall <2> "allcanvs scan mark 0 %y"
@@ -404,9 +402,12 @@ proc makewindow {} {
     set maincursor [. cget -cursor]
     set textcursor [$ctext cget -cursor]
 
-    set linectxmenu .linectxmenu
-    menu $linectxmenu -tearoff 0
-    $linectxmenu add command -label "Select" -command lineselect
+    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}
 }
 
 # when we make a key binding for the toplevel, make sure
@@ -536,13 +537,11 @@ proc about {} {
     toplevel $w
     wm title $w "About gitk"
     message $w.m -text {
-Gitk version 1.1
+Gitk version 1.2
 
 Copyright © 2005 Paul Mackerras
 
-Use and redistribute under the terms of the GNU General Public License
-
-(CVS $Revision: 1.24 $)} \
+Use and redistribute under the terms of the GNU General Public License} \
 	    -justify center -aspect 400
     pack $w.m -side top -fill x -padx 20 -pady 20
     button $w.ok -text Close -command "destroy $w"
@@ -641,10 +640,10 @@ proc initgraph {} {
 proc bindline {t id} {
     global canv
 
-    $canv bind $t <Button-3> "linemenu %X %Y $id"
     $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"
 }
 
 proc drawcommitline {level} {
@@ -655,7 +654,7 @@ proc drawcommitline {level} {
     global oldlevel oldnlines oldtodo
     global idtags idline idheads
     global lineno lthickness mainline sidelines
-    global commitlisted
+    global commitlisted rowtextx
 
     incr numcommits
     incr lineno
@@ -710,10 +709,12 @@ proc drawcommitline {level} {
 	       [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 [expr $canvx0 + [llength $todo] * $linespc]
     if {[llength $currentparents] > 2} {
 	set xt [expr {$xt + ([llength $currentparents] - 2) * $linespc}]
     }
+    set rowtextx($lineno) $xt
     set marks {}
     set ntags 0
     if {[info exists idtags($id)]} {
@@ -761,6 +762,7 @@ proc drawcommitline {level} {
     set date [lindex $commitinfo($id) 2]
     set linehtag($lineno) [$canv create text $xt $y1 -anchor w \
 			       -text $headline -font $mainfont ]
+    $canv bind $linehtag($lineno) <Button-3> "rowmenu %X %Y $id"
     set linentag($lineno) [$canv2 create text 3 $y1 -anchor w \
 			       -text $name -font $namefont]
     set linedtag($lineno) [$canv3 create text 3 $y1 -anchor w \
@@ -1218,9 +1220,9 @@ proc unmarkmatches {} {
     catch {unset matchinglines}
 }
 
-proc selcanvline {x y} {
+proc selcanvline {w x y} {
     global canv canvy0 ctext linespc selectedline
-    global lineid linehtag linentag linedtag
+    global lineid linehtag linentag linedtag rowtextx
     set ymax [lindex [$canv cget -scrollregion] 3]
     if {$ymax == {}} return
     set yfrac [lindex [$canv yview] 0]
@@ -1229,7 +1231,9 @@ proc selcanvline {x y} {
     if {$l < 0} {
 	set l 0
     }
-    if {[info exists selectedline] && $selectedline == $l} return
+    if {$w eq $canv} {
+	if {![info exists rowtextx($l)] || $x < $rowtextx($l)} return
+    }
     unmarkmatches
     selectline $l
 }
@@ -1237,8 +1241,8 @@ proc selcanvline {x y} {
 proc selectline {l} {
     global canv canv2 canv3 ctext commitinfo selectedline
     global lineid linehtag linentag linedtag
-    global canvy0 linespc nparents treepending
-    global cflist treediffs currentid sha1entry
+    global canvy0 linespc parents nparents
+    global cflist currentid sha1entry diffids
     global commentend seenfile idtags
     $canv delete hover
     if {![info exists lineid($l)] || ![info exists linehtag($l)]} return
@@ -1292,6 +1296,7 @@ proc selectline {l} {
 
     set id $lineid($l)
     set currentid $id
+    set diffids [concat $id $parents($id)]
     $sha1entry delete 0 end
     $sha1entry insert 0 $id
     $sha1entry selection from 0
@@ -1299,6 +1304,8 @@ proc selectline {l} {
 
     $ctext conf -state normal
     $ctext delete 0.0 end
+    $ctext mark set fmark.0 0.0
+    $ctext mark gravity fmark.0 left
     set info $commitinfo($id)
     $ctext insert end "Author: [lindex $info 1]  [lindex $info 2]\n"
     $ctext insert end "Committer: [lindex $info 3]  [lindex $info 4]\n"
@@ -1318,18 +1325,25 @@ proc selectline {l} {
     set commentend [$ctext index "end - 1c"]
 
     $cflist delete 0 end
+    $cflist insert end "Comments"
     if {$nparents($id) == 1} {
-	if {![info exists treediffs($id)]} {
-	    if {![info exists treepending]} {
-		gettreediffs $id
-	    }
-	} else {
-	    addtocflist $id
-	}
+	startdiff
     }
     catch {unset seenfile}
 }
 
+proc startdiff {} {
+    global treediffs diffids treepending
+
+    if {![info exists treediffs($diffids)]} {
+	if {![info exists treepending]} {
+	    gettreediffs $diffids
+	}
+    } else {
+	addtocflist $diffids
+    }
+}
+
 proc selnextline {dir} {
     global selectedline
     if {![info exists selectedline]} return
@@ -1338,76 +1352,81 @@ proc selnextline {dir} {
     selectline $l
 }
 
-proc addtocflist {id} {
-    global currentid treediffs cflist treepending
-    if {$id != $currentid} {
-	gettreediffs $currentid
+proc addtocflist {ids} {
+    global diffids treediffs cflist
+    if {$ids != $diffids} {
+	gettreediffs $diffids
 	return
     }
-    $cflist insert end "All files"
-    foreach f $treediffs($currentid) {
+    foreach f $treediffs($ids) {
 	$cflist insert end $f
     }
-    getblobdiffs $id
+    getblobdiffs $ids
 }
 
-proc gettreediffs {id} {
+proc gettreediffs {ids} {
     global treediffs parents treepending
-    set treepending $id
-    set treediffs($id) {}
-    set p [lindex $parents($id) 0]
+    set treepending $ids
+    set treediffs($ids) {}
+    set id [lindex $ids 0]
+    set p [lindex $ids 1]
     if [catch {set gdtf [open "|git-diff-tree -r $p $id" r]}] return
     fconfigure $gdtf -blocking 0
-    fileevent $gdtf readable "gettreediffline $gdtf $id"
+    fileevent $gdtf readable "gettreediffline $gdtf {$ids}"
 }
 
-proc gettreediffline {gdtf id} {
+proc gettreediffline {gdtf ids} {
     global treediffs treepending
     set n [gets $gdtf line]
     if {$n < 0} {
 	if {![eof $gdtf]} return
 	close $gdtf
 	unset treepending
-	addtocflist $id
+	addtocflist $ids
 	return
     }
     set file [lindex $line 5]
-    lappend treediffs($id) $file
+    lappend treediffs($ids) $file
 }
 
-proc getblobdiffs {id} {
-    global parents diffopts blobdifffd env curdifftag curtagstart
-    global diffindex difffilestart
-    set p [lindex $parents($id) 0]
+proc getblobdiffs {ids} {
+    global diffopts blobdifffd env curdifftag curtagstart
+    global diffindex difffilestart nextupdate
+
+    set id [lindex $ids 0]
+    set p [lindex $ids 1]
     set env(GIT_DIFF_OPTS) $diffopts
     if [catch {set bdf [open "|git-diff-tree -r -p $p $id" r]} err] {
 	puts "error getting diffs: $err"
 	return
     }
     fconfigure $bdf -blocking 0
-    set blobdifffd($id) $bdf
+    set blobdifffd($ids) $bdf
     set curdifftag Comments
     set curtagstart 0.0
     set diffindex 0
     catch {unset difffilestart}
-    fileevent $bdf readable "getblobdiffline $bdf $id"
+    fileevent $bdf readable "getblobdiffline $bdf {$ids}"
+    set nextupdate [expr {[clock clicks -milliseconds] + 100}]
 }
 
-proc getblobdiffline {bdf id} {
-    global currentid blobdifffd ctext curdifftag curtagstart seenfile
+proc getblobdiffline {bdf ids} {
+    global diffids blobdifffd ctext curdifftag curtagstart seenfile
     global diffnexthead diffnextnote diffindex difffilestart
+    global nextupdate
+
     set n [gets $bdf line]
     if {$n < 0} {
 	if {[eof $bdf]} {
 	    close $bdf
-	    if {$id == $currentid && $bdf == $blobdifffd($id)} {
+	    if {$ids == $diffids && $bdf == $blobdifffd($ids)} {
 		$ctext tag add $curdifftag $curtagstart end
 		set seenfile($curdifftag) 1
 	    }
 	}
 	return
     }
-    if {$id != $currentid || $bdf != $blobdifffd($id)} {
+    if {$ids != $diffids || $bdf != $blobdifffd($ids)} {
 	return
     }
     $ctext conf -state normal
@@ -1423,8 +1442,12 @@ proc getblobdiffline {bdf id} {
 	    set header "$diffnexthead ($diffnextnote)"
 	    unset diffnexthead
 	}
-	set difffilestart($diffindex) [$ctext index "end - 1c"]
+	set here [$ctext index "end - 1c"]
+	set difffilestart($diffindex) $here
 	incr diffindex
+	# start mark names at fmark.1 for first file
+	$ctext mark set fmark.$diffindex $here
+	$ctext mark gravity fmark.$diffindex left
 	set curdifftag "f:$fname"
 	$ctext tag delete $curdifftag
 	set l [expr {(78 - [string length $header]) / 2}]
@@ -1476,6 +1499,12 @@ proc getblobdiffline {bdf id} {
 	}
     }
     $ctext conf -state disabled
+    if {[clock clicks -milliseconds] >= $nextupdate} {
+	incr nextupdate 100
+	fileevent $bdf readable {}
+	update
+	fileevent $bdf readable "getblobdiffline $bdf {$ids}"
+    }
 }
 
 proc nextfile {} {
@@ -1492,27 +1521,10 @@ proc nextfile {} {
 proc listboxsel {} {
     global ctext cflist currentid treediffs seenfile
     if {![info exists currentid]} return
-    set sel [$cflist curselection]
-    if {$sel == {} || [lsearch -exact $sel 0] >= 0} {
-	# show everything
-	$ctext tag conf Comments -elide 0
-	foreach f $treediffs($currentid) {
-	    if [info exists seenfile(f:$f)] {
-		$ctext tag conf "f:$f" -elide 0
-	    }
-	}
-    } else {
-	# just show selected files
-	$ctext tag conf Comments -elide 1
-	set i 1
-	foreach f $treediffs($currentid) {
-	    set elide [expr {[lsearch -exact $sel $i] < 0}]
-	    if [info exists seenfile(f:$f)] {
-		$ctext tag conf "f:$f" -elide $elide
-	    }
-	    incr i
-	}
-    }
+    set sel [lsort [$cflist curselection]]
+    if {$sel eq {}} return
+    set first [lindex $sel 0]
+    catch {$ctext yview fmark.$first}
 }
 
 proc setcoords {} {
@@ -1591,19 +1603,6 @@ proc gotocommit {} {
     error_popup "$type $sha1string is not known"
 }
 
-proc linemenu {x y id} {
-    global linectxmenu linemenuid
-    set linemenuid $id
-    $linectxmenu post $x $y
-}
-
-proc lineselect {} {
-    global linemenuid idline
-    if {[info exists linemenuid] && [info exists idline($linemenuid)]} {
-	selectline $idline($linemenuid)
-    }
-}
-
 proc lineenter {x y id} {
     global hoverx hovery hoverid hovertimer
     global commitinfo canv
@@ -1667,6 +1666,101 @@ proc linehover {} {
     $canv raise $t
 }
 
+proc lineclick {x y id} {
+    global ctext commitinfo children cflist canv
+
+    unmarkmatches
+    $canv delete hover
+    # fill the details pane with info about this line
+    $ctext conf -state normal
+    $ctext delete 0.0 end
+    $ctext insert end "Parent:\n "
+    catch {destroy $ctext.$id}
+    button $ctext.$id -text "Go:" -command "selbyid $id" \
+	-padx 4 -pady 0
+    $ctext window create end -window $ctext.$id -align center
+    set info $commitinfo($id)
+    $ctext insert end "\t[lindex $info 0]\n"
+    $ctext insert end "\tAuthor:\t[lindex $info 1]\n"
+    $ctext insert end "\tDate:\t[lindex $info 2]\n"
+    $ctext insert end "\tID:\t$id\n"
+    if {[info exists children($id)]} {
+	$ctext insert end "\nChildren:"
+	foreach child $children($id) {
+	    $ctext insert end "\n "
+	    catch {destroy $ctext.$child}
+	    button $ctext.$child -text "Go:" -command "selbyid $child" \
+		-padx 4 -pady 0
+	    $ctext window create end -window $ctext.$child -align center
+	    set info $commitinfo($child)
+	    $ctext insert end "\t[lindex $info 0]"
+	}
+    }
+    $ctext conf -state disabled
+
+    $cflist delete 0 end
+}
+
+proc selbyid {id} {
+    global idline
+    if {[info exists idline($id)]} {
+	selectline $idline($id)
+    }
+}
+
+proc mstime {} {
+    global startmstime
+    if {![info exists startmstime]} {
+	set startmstime [clock clicks -milliseconds]
+    }
+    return [format "%.3f" [expr {([clock click -milliseconds] - $startmstime) / 1000.0}]]
+}
+
+proc rowmenu {x y id} {
+    global rowctxmenu idline selectedline rowmenuid
+
+    if {![info exists selectedline] || $idline($id) eq $selectedline} {
+	set state disabled
+    } else {
+	set state normal
+    }
+    $rowctxmenu entryconfigure 0 -state $state
+    $rowctxmenu entryconfigure 1 -state $state
+    set rowmenuid $id
+    tk_popup $rowctxmenu $x $y
+}
+
+proc diffvssel {dirn} {
+    global rowmenuid selectedline lineid
+    global ctext cflist
+    global diffids commitinfo
+
+    if {![info exists selectedline]} return
+    if {$dirn} {
+	set oldid $lineid($selectedline)
+	set newid $rowmenuid
+    } else {
+	set oldid $rowmenuid
+	set newid $lineid($selectedline)
+    }
+    $ctext conf -state normal
+    $ctext delete 0.0 end
+    $ctext mark set fmark.0 0.0
+    $ctext mark gravity fmark.0 left
+    $cflist delete 0 end
+    $cflist insert end "Top"
+    $ctext insert end "From $oldid\n     "
+    $ctext insert end [lindex $commitinfo($oldid) 0]
+    $ctext insert end "\n\nTo   $newid\n     "
+    $ctext insert end [lindex $commitinfo($newid) 0]
+    $ctext insert end "\n"
+    $ctext conf -state disabled
+    $ctext tag delete Comments
+    $ctext tag remove found 1.0 end
+    set diffids [list $newid $oldid]
+    startdiff
+}
+
 proc doquit {} {
     global stopped
     set stopped 100