hgk: use short changeset hashes

this fixes the missing tags on hgk window

contrib/hgk

@@ -100,7 +100,7 b' to allow selection of commits to be disp'
 	    set ids [string range $cmit 0 [expr {$j - 1}]]
 	    set ok 1
 	    foreach id $ids {
-		if {![regexp {^[0-9a-f]{40}$} $id]} {
+		if {![regexp {^[0-9a-f]{12}$} $id]} {
 		    set ok 0
 		    break
 		}
@@ -261,7 +261,7 b' proc readotherrefs {base dname excl} {'
 	catch {
 	    set fd [open $f r]
 	    set line [read $fd 40]
-	    if {[regexp {^[0-9a-f]{40}} $line id]} {
+	    if {[regexp {^[0-9a-f]{12}} $line id]} {
 		set name "$dname[file tail $f]"
 		set otherrefids($name) $id
 		lappend idotherrefs($id) $name
@@ -1743,7 +1743,7 b' proc readfindproc {} {'
 	}
 	return
     }
-    if {![regexp {^[0-9a-f]{40}} $line id]} {
+    if {![regexp {^[0-9a-f]{12}} $line id]} {
 	error_popup "Can't parse git-diff-tree output: $line"
 	stopfindproc
 	return
@@ -1856,7 +1856,7 b' proc readfilediffs {df} {'
 	}
 	return
     }
-    if {[regexp {^([0-9a-f]{40}) \(from ([0-9a-f]{40})\)} $line match id p]} {
+    if {[regexp {^([0-9a-f]{12}) \(from ([0-9a-f]{12})\)} $line match id p]} {
 	# start of a new string of diffs
 	donefilediff
 	set fdiffids [list $id $p]
@@ -2014,7 +2014,7 b' proc appendwithlinks {text} {'
     set start [$ctext index "end - 1c"]
     $ctext insert end $text
     $ctext insert end "\n"
-    set links [regexp -indices -all -inline {[0-9a-f]{40}} $text]
+    set links [regexp -indices -all -inline {[0-9a-f]{12}} $text]
     foreach l $links {
 	set s [lindex $l 0]
 	set e [lindex $l 1]

hgext/hgk.py

@@ -87,12 +87,17 b' def difftree(ui, repo, node1=None, node2'
 
         for f in modified:
             # TODO get file permissions
-            print ":100664 100664 %s %s M\t%s\t%s" % (hg.hex(mmap[f]),
-                                                      hg.hex(mmap2[f]), f, f)
+            print ":100664 100664 %s %s M\t%s\t%s" % (hg.short(mmap[f]),
+                                                      hg.short(mmap2[f]),
+                                                      f, f)
         for f in added:
-            print ":000000 100664 %s %s N\t%s\t%s" % (empty, hg.hex(mmap2[f]), f, f)
+            print ":000000 100664 %s %s N\t%s\t%s" % (empty,
+                                                      hg.short(mmap2[f]),
+                                                      f, f)
         for f in removed:
-            print ":100664 000000 %s %s D\t%s\t%s" % (hg.hex(mmap[f]), empty, f, f)
+            print ":100664 000000 %s %s D\t%s\t%s" % (hg.short(mmap[f]),
+                                                      empty,
+                                                      f, f)
     ##
 
     while True:
@@ -124,11 +129,11 b' def difftree(ui, repo, node1=None, node2'
 def catcommit(repo, n, prefix, changes=None):
     nlprefix = '\n' + prefix;
     (p1, p2) = repo.changelog.parents(n)
-    (h, h1, h2) = map(hg.hex, (n, p1, p2))
+    (h, h1, h2) = map(hg.short, (n, p1, p2))
     (i1, i2) = map(repo.changelog.rev, (p1, p2))
     if not changes:
         changes = repo.changelog.read(n)
-    print "tree %s" % (hg.hex(changes[0]))
+    print "tree %s" % (hg.short(changes[0]))
     if i1 != -1: print "parent %s" % (h1)
     if i2 != -1: print "parent %s" % (h2)
     date_ar = changes[2]
@@ -154,7 +159,7 b' def base(ui, repo, node1, node2):'
     node1 = repo.lookup(node1)
     node2 = repo.lookup(node2)
     n = repo.changelog.ancestor(node1, node2)
-    print hg.hex(n)
+    print hg.short(n)
 
 def catfile(ui, repo, type=None, r=None, **opts):
     """cat a specific revision"""
@@ -276,17 +281,17 b' def revtree(args, repo, full="tree", max'
             if parents:
                 pp = repo.changelog.parents(n)
                 if pp[0] != hg.nullid:
-                    parentstr += " " + hg.hex(pp[0])
+                    parentstr += " " + hg.short(pp[0])
                 if pp[1] != hg.nullid:
-                    parentstr += " " + hg.hex(pp[1])
+                    parentstr += " " + hg.short(pp[1])
             if not full:
-                print hg.hex(n) + parentstr
+                print hg.short(n) + parentstr
             elif full is "commit":
-                print hg.hex(n) + parentstr
+                print hg.short(n) + parentstr
                 catcommit(repo, n, '    ', changes)
             else:
                 (p1, p2) = repo.changelog.parents(n)
-                (h, h1, h2) = map(hg.hex, (n, p1, p2))
+                (h, h1, h2) = map(hg.short, (n, p1, p2))
                 (i1, i2) = map(repo.changelog.rev, (p1, p2))
 
                 date = changes[2][0]