gitk: Show current row number and total number of rows

This adds a couple of fields in the bar just below the upper panes
that show the row number of the currently selected commit, and how
many rows are displayed in total.  The latter increments as commits
are read in, and thus functions to show that progress is being made.
This therefore also removes the code that showed progress using a
green oscillating bar in the progress bar window (which some people
disliked).

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

gitk

@@ -293,11 +293,10 @@ proc parseviewrevs {view revs} {
 
 # Start off a git log process and arrange to read its output
 proc start_rev_list {view} {
-    global startmsecs commitidx viewcomplete
+    global startmsecs commitidx viewcomplete curview
     global commfd leftover tclencoding
     global viewargs viewargscmd viewfiles vfilelimit
     global showlocalchanges commitinterest mainheadid
-    global progressdirn progresscoords proglastnc curview
     global viewactive loginstance viewinstances vmergeonly
     global pending_select mainheadid
     global vcanopt vflags vrevs vorigargs
@@ -369,9 +368,6 @@ proc start_rev_list {view} {
     filerun $fd [list getcommitlines $fd $i $view 0]
     nowbusy $view [mc "Reading"]
     if {$view == $curview} {
-	set progressdirn 1
-	set progresscoords {0 0}
-	set proglastnc 0
 	set pending_select $mainheadid
     }
     set viewcomplete($view) 0
@@ -493,12 +489,10 @@ proc updatecommits {} {
 proc reloadcommits {} {
     global curview viewcomplete selectedline currentid thickerline
     global showneartags treediffs commitinterest cached_commitrow
-    global progresscoords targetid
+    global targetid
 
     if {!$viewcomplete($curview)} {
 	stop_rev_list $curview
-	set progresscoords {0 0}
-	adjustprogress
     }
     resetvarcs $curview
     catch {unset selectedline}
@@ -1278,7 +1272,7 @@ proc getcommitlines {fd inst view updating}  {
 	if {![eof $fd]} {
 	    return 1
 	}
-	global commfd viewcomplete viewactive viewname progresscoords
+	global commfd viewcomplete viewactive viewname
 	global viewinstances
 	unset commfd($inst)
 	set i [lsearch -exact $viewinstances($view) $inst]
@@ -1311,8 +1305,6 @@ proc getcommitlines {fd inst view updating}  {
 	    # appeared in the list
 	    closevarcs $view
 	    notbusy $view
-	    set progresscoords {0 0}
-	    adjustprogress
 	}
 	if {$view == $curview} {
 	    run chewcommits
@@ -1463,33 +1455,6 @@ proc getcommitlines {fd inst view updating}  {
 	foreach s $scripts {
 	    eval $s
 	}
-	if {$view == $curview} {
-	    # update progress bar
-	    global progressdirn progresscoords proglastnc
-	    set inc [expr {($commitidx($view) - $proglastnc) * 0.0002}]
-	    set proglastnc $commitidx($view)
-	    set l [lindex $progresscoords 0]
-	    set r [lindex $progresscoords 1]
-	    if {$progressdirn} {
-		set r [expr {$r + $inc}]
-		if {$r >= 1.0} {
-		    set r 1.0
-		    set progressdirn 0
-		}
-		if {$r > 0.2} {
-		    set l [expr {$r - 0.2}]
-		}
-	    } else {
-		set l [expr {$l - $inc}]
-		if {$l <= 0.0} {
-		    set l 0.0
-		    set progressdirn 1
-		}
-		set r [expr {$l + 0.2}]
-	    }
-	    set progresscoords [list $l $r]
-	    adjustprogress
-	}
     }
     return 2
 }
@@ -1747,7 +1712,7 @@ proc makewindow {} {
     global bgcolor fgcolor bglist fglist diffcolors selectbgcolor
     global headctxmenu progresscanv progressitem progresscoords statusw
     global fprogitem fprogcoord lastprogupdate progupdatepending
-    global rprogitem rprogcoord
+    global rprogitem rprogcoord rownumsel numcommits
     global have_tk85
 
     menu .bar
@@ -1863,6 +1828,18 @@ proc makewindow {} {
 	-state disabled -width 26
     pack .tf.bar.rightbut -side left -fill y
 
+    label .tf.bar.rowlabel -text [mc "Row"]
+    set rownumsel {}
+    label .tf.bar.rownum -width 7 -font textfont -textvariable rownumsel \
+	-relief sunken -anchor e
+    label .tf.bar.rowlabel2 -text "/"
+    label .tf.bar.numcommits -width 7 -font textfont -textvariable numcommits \
+	-relief sunken -anchor e
+    pack .tf.bar.rowlabel .tf.bar.rownum .tf.bar.rowlabel2 .tf.bar.numcommits \
+	-side left
+    global selectedline
+    trace add variable selectedline {write unset} selectedline_change
+
     # Status label and progress bar
     set statusw .tf.bar.status
     label $statusw -width 15 -relief sunken
@@ -2204,6 +2181,17 @@ proc windows_mousewheel_redirector {W X Y D} {
     }
 }
 
+# Update row number label when selectedline changes
+proc selectedline_change {n1 n2 op} {
+    global selectedline rownumsel
+
+    if {$op eq "unset"} {
+	set rownumsel {}
+    } else {
+	set rownumsel [expr {$selectedline + 1}]
+    }
+}
+
 # mouse-2 makes all windows scan vertically, but only the one
 # the cursor is in scans horizontally
 proc canvscan {op w x y} {
@@ -9877,6 +9865,7 @@ set viewperm(0) 0
 set viewargs(0) {}
 set viewargscmd(0) {}
 
+set numcommits 0
 set loginstance 0
 set cmdlineok 0
 set stopped 0