gitk: Don't try to list large numbers of tags or heads in the details pane

With some large repositories, a commit can end up on thousands of
branches, which results in an extremely long "Branches:" line in the
details window, and that results in the window being extremely slow
to scroll.

This fixes it by just showing "many (N)" after "Branches:", "Follows:"
or "Precedes:", where N is the number of heads or tags.  The limit
is currently set at 20 but could be made configurable (and the "many"
could be a link to pop up a window listing them all in case anyone
really wants to know).

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

diff --git a/gitk b/gitk
index 5948ec37c5c08883ebfed88af53731fffea521e1..de5bae7a0e6e2603d0eaf15d9b3212934ea5fd56 100755 (executable)
--- a/gitk
+++ b/gitk
@@ -3831,7 +3831,7 @@ proc viewnextline {dir} {
 # add a list of tag or branch names at position pos
 # returns the number of names inserted
 proc appendrefs {pos ids var} {
-    global ctext commitrow linknum curview $var
+    global ctext commitrow linknum curview $var maxrefs
 
     if {[catch {$ctext index $pos}]} {
        return 0
@@ -3844,24 +3844,29 @@ proc appendrefs {pos ids var} {
            lappend tags [list $tag $id]
        }
     }
-    set tags [lsort -index 0 -decreasing $tags]
-    set sep {}
-    foreach ti $tags {
-       set id [lindex $ti 1]
-       set lk link$linknum
-       incr linknum
-       $ctext tag delete $lk
-       $ctext insert $pos $sep
-       $ctext insert $pos [lindex $ti 0] $lk
-       if {[info exists commitrow($curview,$id)]} {
-           $ctext tag conf $lk -foreground blue
-           $ctext tag bind $lk <1> \
-               [list selectline $commitrow($curview,$id) 1]
-           $ctext tag conf $lk -underline 1
-           $ctext tag bind $lk <Enter> { %W configure -cursor hand2 }
-           $ctext tag bind $lk <Leave> { %W configure -cursor $curtextcursor }
+    if {[llength $tags] > $maxrefs} {
+       $ctext insert $pos "many ([llength $tags])"
+    } else {
+       set tags [lsort -index 0 -decreasing $tags]
+       set sep {}
+       foreach ti $tags {
+           set id [lindex $ti 1]
+           set lk link$linknum
+           incr linknum
+           $ctext tag delete $lk
+           $ctext insert $pos $sep
+           $ctext insert $pos [lindex $ti 0] $lk
+           if {[info exists commitrow($curview,$id)]} {
+               $ctext tag conf $lk -foreground blue
+               $ctext tag bind $lk <1> \
+                   [list selectline $commitrow($curview,$id) 1]
+               $ctext tag conf $lk -underline 1
+               $ctext tag bind $lk <Enter> { %W configure -cursor hand2 }
+               $ctext tag bind $lk <Leave> \
+                   { %W configure -cursor $curtextcursor }
+           }
+           set sep ", "
        }
-       set sep ", "
     }
     $ctext conf -state disabled
     return [llength $tags]
@@ -6856,6 +6861,7 @@ set mingaplen 30
 set cmitmode "patch"
 set wrapcomment "none"
 set showneartags 1
+set maxrefs 20
 
 set colors {green red blue magenta darkgrey brown orange}
 set bgcolor white