gitk: Add a help menu item to display key bindings

Suggested by Paul Schulz.  I made it a separate entry under the Help
menu rather than putting it in the About box, though.

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

diff --git a/gitk b/gitk
index 4bc7946..472c12a 100755 (executable)
--- a/gitk
+++ b/gitk
@@ -353,6 +353,7 @@ proc makewindow {rargs} {
     menu .bar.help
     .bar add cascade -label "Help" -menu .bar.help
     .bar.help add command -label "About gitk" -command about
+    .bar.help add command -label "Key bindings" -command keys
     . configure -menu .bar
 
     if {![info exists geometry(canv1)]} {
@@ -718,6 +719,47 @@ Use and redistribute under the terms of the GNU General Public License} \
     pack $w.ok -side bottom
 }
 
+proc keys {} {
+    set w .keys
+    if {[winfo exists $w]} {
+       raise $w
+       return
+    }
+    toplevel $w
+    wm title $w "Gitk key bindings"
+    message $w.m -text {
+Gitk key bindings:
+
+<Ctrl-Q>               Quit
+<Up>, p, i     Move up one commit
+<Down>, n, k   Move down one commit
+<Left>, z, j   Go back in history list
+<Right>, x, l  Go forward in history list
+<Page up>      Scroll commit list up one page
+<Page down>    Scroll commit list down one page
+<Delete>, b    Scroll diff view up one page
+<Backspace>    Scroll diff view up one page
+<Space>                Scroll diff view down one page
+u              Scroll diff view up 18 lines
+d              Scroll diff view down 18 lines
+<Ctrl-F>               Find
+<Ctrl-G>               Move to next find hit
+<Ctrl-R>               Move to previous find hit
+<Return>       Move to next find hit
+/              Move to next find hit, or redo find
+?              Move to previous find hit
+f              Scroll diff view to next file
+<Ctrl-KP+>     Increase font size
+<Ctrl-plus>    Increase font size
+<Ctrl-KP->     Decrease font size
+<Ctrl-minus>   Decrease font size
+} \
+           -justify left -bg white -border 2 -relief sunken
+    pack $w.m -side top -fill both
+    button $w.ok -text Close -command "destroy $w"
+    pack $w.ok -side bottom
+}
+
 proc shortids {ids} {
     set res {}
     foreach id $ids {
@@ -1763,7 +1805,7 @@ proc drawrest {} {
     showstuff $commitidx
 
     set drawmsecs [expr {[clock clicks -milliseconds] - $startmsecs}]
-    puts "overall $drawmsecs ms for $numcommits commits"
+    #puts "overall $drawmsecs ms for $numcommits commits"
 }
 
 proc findmatches {f} {