gitk: Fix the find and highlight functions

This reworks the way that the "Find" button (and the /, ?, ^F, and ^G
keys) works.  Previously, pressing the "Find" button would cause gitk
to go off and scan through every commit to see which commits matched,
and the user interface was completely unreponsive during that time.
Now the searching is done in chunks using the scheduler, so the UI
still responds, and the search stops as soon as a matching commit is
found.

The highlighting of matches using a yellow background is now done in
the commit-drawing code and the highlighting code.  This ensures that
all the commits that are visible that match are highlighted without
the search code having to find them all.

This also fixes a bug where previously-drawn commits that need to be
highlighted were not being highlighted.

Signed-off-by: Paul Mackerras <paulus@samba.org>

gitk

@@ -1758,7 +1758,7 @@ proc showview {n} {
     global colormap rowtextx commitrow nextcolor canvxmax
     global numcommits rowrangelist commitlisted idrowranges rowchk
     global selectedline currentid canv canvy0
-    global matchinglines treediffs
+    global treediffs
     global pending_select phase
     global commitidx rowlaidout rowoptim
     global commfd
@@ -1802,7 +1802,6 @@ proc showview {n} {
 		[list {} $rowidlist $rowoffsets $rowrangelist]
 	}
     }
-    catch {unset matchinglines}
     catch {unset treediffs}
     clear_display
     if {[info exists hlview] && $hlview == $n} {
@@ -2132,7 +2131,7 @@ proc readfhighlight {} {
 
 proc find_change {name ix op} {
     global nhighlights mainfont boldnamerows
-    global findstring findpattern findtype
+    global findstring findpattern findtype markingmatches
 
     # delete previous highlights, if any
     foreach row $boldnamerows {
@@ -2141,17 +2140,32 @@ proc find_change {name ix op} {
     set boldnamerows {}
     catch {unset nhighlights}
     unbolden
+    unmarkmatches
     if {$findtype ne "Regexp"} {
 	set e [string map {"*" "\\*" "?" "\\?" "\[" "\\\[" "\\" "\\\\"} \
 		   $findstring]
 	set findpattern "*$e*"
     }
+    set markingmatches [expr {$findstring ne {}}]
     drawvisible
 }
 
+proc doesmatch {f} {
+    global findtype findstring findpattern
+
+    if {$findtype eq "Regexp"} {
+	return [regexp $findstring $f]
+    } elseif {$findtype eq "IgnCase"} {
+	return [string match -nocase $findpattern $f]
+    } else {
+	return [string match $findpattern $f]
+    }
+}
+
 proc askfindhighlight {row id} {
     global nhighlights commitinfo iddrawn mainfont
-    global findstring findtype findloc findpattern
+    global findloc
+    global markingmatches
 
     if {![info exists commitinfo($id)]} {
 	getcommit $id
@@ -2160,35 +2174,47 @@ proc askfindhighlight {row id} {
     set isbold 0
     set fldtypes {Headline Author Date Committer CDate Comments}
     foreach f $info ty $fldtypes {
-	if {$findloc ne "All fields" && $findloc ne $ty} {
+	if {($findloc eq "All fields" || $findloc eq $ty) &&
-	    continue
+	    [doesmatch $f]} {
-	}
-	if {$findtype eq "Regexp"} {
-	    set doesmatch [regexp $findstring $f]
-	} elseif {$findtype eq "IgnCase"} {
-	    set doesmatch [string match -nocase $findpattern $f]
-	} else {
-	    set doesmatch [string match $findpattern $f]
-	}
-	if {$doesmatch} {
 	    if {$ty eq "Author"} {
 		set isbold 2
-	    } else {
+		break
-		set isbold 1
 	    }
+	    set isbold 1
 	}
     }
-    if {[info exists iddrawn($id)]} {
+    if {$isbold && [info exists iddrawn($id)]} {
-	if {$isbold && ![ishighlighted $row]} {
+	set f [concat $mainfont bold]
-	    bolden $row [concat $mainfont bold]
+	if {![ishighlighted $row]} {
+	    bolden $row $f
+	    if {$isbold > 1} {
+		bolden_name $row $f
+	    }
 	}
-	if {$isbold >= 2} {
+	if {$markingmatches} {
-	    bolden_name $row [concat $mainfont bold]
+	    markrowmatches $row [lindex $info 0] [lindex $info 1]
 	}
     }
     set nhighlights($row) $isbold
 }
 
+proc markrowmatches {row headline author} {
+    global canv canv2 linehtag linentag
+
+    $canv delete match$row
+    $canv2 delete match$row
+    set m [findmatches $headline]
+    if {$m ne {}} {
+	markmatches $canv $row $headline $linehtag($row) $m \
+	    [$canv itemcget $linehtag($row) -font]
+    }
+    set m [findmatches $author]
+    if {$m ne {}} {
+	markmatches $canv2 $row $author $linentag($row) $m \
+	    [$canv2 itemcget $linentag($row) -font]
+    }
+}
+
 proc vrel_change {name ix op} {
     global highlight_related
 
@@ -3309,7 +3335,7 @@ proc drawcmittext {id row col} {
     global linespc canv canv2 canv3 canvy0 fgcolor
     global commitlisted commitinfo rowidlist parentlist
     global rowtextx idpos idtags idheads idotherrefs
-    global linehtag linentag linedtag
+    global linehtag linentag linedtag markingmatches
     global mainfont canvxmax boldrows boldnamerows fgcolor nullid
 
     if {$id eq $nullid} {
@@ -3366,6 +3392,9 @@ proc drawcmittext {id row col} {
     set linedtag($row) [$canv3 create text 3 $y -anchor w -fill $fgcolor \
 			    -text $date -font $mainfont -tags text]
     set xr [expr {$xt + [font measure $mainfont $headline]}]
+    if {$markingmatches} {
+	markrowmatches $row $headline $name
+    }
     if {$xr > $canvxmax} {
 	set canvxmax $xr
 	setcanvscroll
@@ -3436,9 +3465,7 @@ proc drawcommits {row {endrow {}}} {
     for {} {$r <= $er} {incr r} {
 	set id [lindex $displayorder $r]
 	set wasdrawn [info exists iddrawn($id)]
-	if {!$wasdrawn} {
+	drawcmitrow $r
-	    drawcmitrow $r
-	}
 	if {$r == $er} break
 	set nextid [lindex $displayorder [expr {$r + 1}]]
 	if {$wasdrawn && [info exists iddrawn($nextid)]} {
@@ -3889,101 +3916,166 @@ proc notbusy {what} {
 }
 
 proc findmatches {f} {
-    global findtype foundstring foundstrlen
+    global findtype findstring
     if {$findtype == "Regexp"} {
-	set matches [regexp -indices -all -inline $foundstring $f]
+	set matches [regexp -indices -all -inline $findstring $f]
     } else {
+	set fs $findstring
 	if {$findtype == "IgnCase"} {
-	    set str [string tolower $f]
+	    set f [string tolower $f]
-	} else {
+	    set fs [string tolower $fs]
-	    set str $f
 	}
 	set matches {}
 	set i 0
-	while {[set j [string first $foundstring $str $i]] >= 0} {
+	set l [string length $fs]
-	    lappend matches [list $j [expr {$j+$foundstrlen-1}]]
+	while {[set j [string first $fs $f $i]] >= 0} {
-	    set i [expr {$j + $foundstrlen}]
+	    lappend matches [list $j [expr {$j+$l-1}]]
+	    set i [expr {$j + $l}]
 	}
     }
     return $matches
 }
 
-proc dofind {} {
+proc dofind {{rev 0}} {
-    global findtype findloc findstring markedmatches commitinfo
+    global findstring findstartline findcurline selectedline numcommits
-    global numcommits displayorder linehtag linentag linedtag
-    global mainfont canv canv2 canv3 selectedline
-    global matchinglines foundstring foundstrlen matchstring
-    global commitdata
 
     stopfindproc
     unmarkmatches
     cancel_next_highlight
     focus .
-    set matchinglines {}
+    if {$findstring eq {} || $numcommits == 0} return
-    if {$findtype == "IgnCase"} {
+    if {![info exists selectedline]} {
-	set foundstring [string tolower $findstring]
+	set findstartline [lindex [visiblerows] $rev]
     } else {
-	set foundstring $findstring
+	set findstartline $selectedline
     }
-    set foundstrlen [string length $findstring]
+    set findcurline $findstartline
-    if {$foundstrlen == 0} return
+    nowbusy finding
-    regsub -all {[*?\[\\]} $foundstring {\\&} matchstring
+    if {!$rev} {
-    set matchstring "*$matchstring*"
+	run findmore
-    if {![info exists selectedline]} {
-	set oldsel -1
     } else {
-	set oldsel $selectedline
+	set findcurline $findstartline
+	if {$findcurline == 0} {
+	    set findcurline $numcommits
+	}
+	incr findcurline -1
+	run findmorerev
     }
-    set didsel 0
+}
-    set fldtypes {Headline Author Date Committer CDate Comments}
+
-    set l -1
+proc findnext {restart} {
-    foreach id $displayorder {
+    global findcurline
-	set d $commitdata($id)
+    if {![info exists findcurline]} {
-	incr l
+	if {$restart} {
-	if {$findtype == "Regexp"} {
+	    dofind
-	    set doesmatch [regexp $foundstring $d]
-	} elseif {$findtype == "IgnCase"} {
-	    set doesmatch [string match -nocase $matchstring $d]
 	} else {
-	    set doesmatch [string match $matchstring $d]
+	    bell
 	}
-	if {!$doesmatch} continue
+    } else {
+	run findmore
+	nowbusy finding
+    }
+}
+
+proc findprev {} {
+    global findcurline
+    if {![info exists findcurline]} {
+	dofind 1
+    } else {
+	run findmorerev
+	nowbusy finding
+    }
+}
+
+proc findmore {} {
+    global commitdata commitinfo numcommits findstring findpattern findloc
+    global findstartline findcurline markingmatches displayorder
+
+    set fldtypes {Headline Author Date Committer CDate Comments}
+    set l [expr {$findcurline + 1}]
+    if {$l >= $numcommits} {
+	set l 0
+    }
+    if {$l <= $findstartline} {
+	set lim [expr {$findstartline + 1}]
+    } else {
+	set lim $numcommits
+    }
+    if {$lim - $l > 500} {
+	set lim [expr {$l + 500}]
+    }
+    set last 0
+    for {} {$l < $lim} {incr l} {
+	set id [lindex $displayorder $l]
+	if {![doesmatch $commitdata($id)]} continue
 	if {![info exists commitinfo($id)]} {
 	    getcommit $id
 	}
 	set info $commitinfo($id)
-	set doesmatch 0
 	foreach f $info ty $fldtypes {
-	    if {$findloc != "All fields" && $findloc != $ty} {
+	    if {($findloc eq "All fields" || $findloc eq $ty) &&
-		continue
+		[doesmatch $f]} {
-	    }
+		set markingmatches 1
-	    set matches [findmatches $f]
+		findselectline $l
-	    if {$matches == {}} continue
+		notbusy finding
-	    set doesmatch 1
+		return 0
-	    if {$ty == "Headline"} {
-		drawcommits $l
-		markmatches $canv $l $f $linehtag($l) $matches $mainfont
-	    } elseif {$ty == "Author"} {
-		drawcommits $l
-		markmatches $canv2 $l $f $linentag($l) $matches $mainfont
-	    } elseif {$ty == "Date"} {
-		drawcommits $l
-		markmatches $canv3 $l $f $linedtag($l) $matches $mainfont
 	    }
 	}
-	if {$doesmatch} {
+    }
-	    lappend matchinglines $l
+    if {$l == $findstartline + 1} {
-	    if {!$didsel && $l > $oldsel} {
+	bell
+	unset findcurline
+	notbusy finding
+	return 0
+    }
+    set findcurline [expr {$l - 1}]
+    return 1
+}
+
+proc findmorerev {} {
+    global commitdata commitinfo numcommits findstring findpattern findloc
+    global findstartline findcurline markingmatches displayorder
+
+    set fldtypes {Headline Author Date Committer CDate Comments}
+    set l $findcurline
+    if {$l == 0} {
+	set l $numcommits
+    }
+    incr l -1
+    if {$l >= $findstartline} {
+	set lim [expr {$findstartline - 1}]
+    } else {
+	set lim -1
+    }
+    if {$l - $lim > 500} {
+	set lim [expr {$l - 500}]
+    }
+    set last 0
+    for {} {$l > $lim} {incr l -1} {
+	set id [lindex $displayorder $l]
+	if {![doesmatch $commitdata($id)]} continue
+	if {![info exists commitinfo($id)]} {
+	    getcommit $id
+	}
+	set info $commitinfo($id)
+	foreach f $info ty $fldtypes {
+	    if {($findloc eq "All fields" || $findloc eq $ty) &&
+		[doesmatch $f]} {
+		set markingmatches 1
 		findselectline $l
-		set didsel 1
+		notbusy finding
+		return 0
 	    }
 	}
     }
-    if {$matchinglines == {}} {
+    if {$l == -1} {
 	bell
-    } elseif {!$didsel} {
+	unset findcurline
-	findselectline [lindex $matchinglines 0]
+	notbusy finding
+	return 0
     }
+    set findcurline [expr {$l + 1}]
+    return 1
 }
 
 proc findselectline {l} {
@@ -4001,43 +4093,6 @@ proc findselectline {l} {
     }
 }
 
-proc findnext {restart} {
-    global matchinglines selectedline
-    if {![info exists matchinglines]} {
-	if {$restart} {
-	    dofind
-	}
-	return
-    }
-    if {![info exists selectedline]} return
-    foreach l $matchinglines {
-	if {$l > $selectedline} {
-	    findselectline $l
-	    return
-	}
-    }
-    bell
-}
-
-proc findprev {} {
-    global matchinglines selectedline
-    if {![info exists matchinglines]} {
-	dofind
-	return
-    }
-    if {![info exists selectedline]} return
-    set prev {}
-    foreach l $matchinglines {
-	if {$l >= $selectedline} break
-	set prev $l
-    }
-    if {$prev != {}} {
-	findselectline $prev
-    } else {
-	bell
-    }
-}
-
 proc stopfindproc {{done 0}} {
     global findprocpid findprocfile findids
     global ctext findoldcursor phase maincursor textcursor
@@ -4055,18 +4110,7 @@ proc stopfindproc {{done 0}} {
     notbusy find
 }
 
-# mark a commit as matching by putting a yellow background
+# mark the bits of a headline or author that match a find string
-# behind the headline
-proc markheadline {l id} {
-    global canv mainfont linehtag
-
-    drawcommits $l
-    set bbox [$canv bbox $linehtag($l)]
-    set t [$canv create rect $bbox -outline {} -tags matches -fill yellow]
-    $canv lower $t
-}
-
-# mark the bits of a headline, author or date that match a find string
 proc markmatches {canv l str tag matches font} {
     set bbox [$canv bbox $tag]
     set x0 [lindex $bbox 0]
@@ -4080,16 +4124,18 @@ proc markmatches {canv l str tag matches font} {
 	set xlen [font measure $font [string range $str 0 [expr {$end}]]]
 	set t [$canv create rect [expr {$x0+$xoff}] $y0 \
 		   [expr {$x0+$xlen+2}] $y1 \
-		   -outline {} -tags matches -fill yellow]
+		   -outline {} -tags [list match$l matches] -fill yellow]
 	$canv lower $t
     }
 }
 
 proc unmarkmatches {} {
-    global matchinglines findids
+    global findids markingmatches findcurline
+
     allcanvs delete matches
-    catch {unset matchinglines}
     catch {unset findids}
+    set markingmatches 0
+    catch {unset findcurline}
 }
 
 proc selcanvline {w x y} {
@@ -7471,6 +7517,7 @@ set searchdirn -forwards
 set boldrows {}
 set boldnamerows {}
 set diffelide {0 0}
+set markingmatches 0
 
 set optim_delay 16