[PATCH] Add an --argscmd flag to get the list of refs to show

This allows gitk to be used to display a different set of refs each
the display is refreshed.  This is useful when gitk is called from
other porcelain suites, for doing such things as displaying the set of
patches in a patch stack.

The user specifies a command as the argument to the --argscmd option.
The command is run initially and each time the display is refreshed,
and is expected to generate a list of commit IDs, one per line.  Those
commits are appended to the commits passed on the command-line when
constructing the git log command to be executed.

The command is considered to be an attribute of a view, and has its
own field in the saved view, and an edit field in the view editor.

Signed-off-by: Yann Dirson <ydirson@altern.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

gitk

@@ -82,21 +82,31 @@ proc dorunq {} {
 proc start_rev_list {view} {
     global startmsecs
     global commfd leftover tclencoding datemode
-    global viewargs viewfiles commitidx viewcomplete vnextroot
+    global viewargs viewargscmd viewfiles commitidx viewcomplete vnextroot
     global showlocalchanges commitinterest mainheadid
     global progressdirn progresscoords proglastnc curview
 
     set startmsecs [clock clicks -milliseconds]
     set commitidx($view) 0
     set viewcomplete($view) 0
     set vnextroot($view) 0
+    set args $viewargs($view)
+    if {$viewargscmd($view) ne {}} {
+	if {[catch {
+	    set str [exec sh -c $viewargscmd($view)]
+	} err]} {
+	    error_popup "Error executing --argscmd command: $err"
+	    exit 1
+	}
+	set args [concat $args [split $str "\n"]]
+    }
     set order "--topo-order"
     if {$datemode} {
 	set order "--date-order"
     }
     if {[catch {
 	set fd [open [concat | git log --no-color -z --pretty=raw $order --parents \
-			 --boundary $viewargs($view) "--" $viewfiles($view)] r]
+			 --boundary $args "--" $viewfiles($view)] r]
     } err]} {
 	error_popup "[mc "Error executing git rev-list:"] $err"
 	exit 1
@@ -1168,7 +1178,7 @@ proc savestuff {w} {
     global canv canv2 canv3 mainfont textfont uifont tabstop
     global stuffsaved findmergefiles maxgraphpct
     global maxwidth showneartags showlocalchanges
-    global viewname viewfiles viewargs viewperm nextviewnum
+    global viewname viewfiles viewargs viewargscmd viewperm nextviewnum
     global cmitmode wrapcomment datetimeformat limitdiffs
     global colors bgcolor fgcolor diffcolors diffcontext selectbgcolor
 
@@ -1207,7 +1217,7 @@ proc savestuff {w} {
 	puts -nonewline $f "set permviews {"
 	for {set v 0} {$v < $nextviewnum} {incr v} {
 	    if {$viewperm($v)} {
-		puts $f "{[list $viewname($v) $viewfiles($v) $viewargs($v)]}"
+		puts $f "{[list $viewname($v) $viewfiles($v) $viewargs($v) $viewargscmd($v)]}"
 	    }
 	}
 	puts $f "}"
@@ -1858,7 +1868,7 @@ proc shellsplit {str} {
 
 proc newview {ishighlight} {
     global nextviewnum newviewname newviewperm newishighlight
-    global newviewargs revtreeargs
+    global newviewargs revtreeargs viewargscmd newviewargscmd curview
 
     set newishighlight $ishighlight
     set top .gitkview
@@ -1869,13 +1879,14 @@ proc newview {ishighlight} {
     set newviewname($nextviewnum) "View $nextviewnum"
     set newviewperm($nextviewnum) 0
     set newviewargs($nextviewnum) [shellarglist $revtreeargs]
+    set newviewargscmd($nextviewnum) $viewargscmd($curview)
     vieweditor $top $nextviewnum [mc "Gitk view definition"]
 }
 
 proc editview {} {
     global curview
     global viewname viewperm newviewname newviewperm
-    global viewargs newviewargs
+    global viewargs newviewargs viewargscmd newviewargscmd
 
     set top .gitkvedit-$curview
     if {[winfo exists $top]} {
@@ -1885,6 +1896,7 @@ proc editview {} {
     set newviewname($curview) $viewname($curview)
     set newviewperm($curview) $viewperm($curview)
     set newviewargs($curview) [shellarglist $viewargs($curview)]
+    set newviewargscmd($curview) $viewargscmd($curview)
     vieweditor $top $curview "Gitk: edit view $viewname($curview)"
 }
 
@@ -1905,6 +1917,14 @@ proc vieweditor {top n title} {
     entry $top.args -width 50 -textvariable newviewargs($n) \
 	-background $bgcolor
     grid $top.args - -sticky ew -padx 5
+
+    message $top.ac -aspect 1000 \
+	-text [mc "Command to generate more commits to include:"]
+    grid $top.ac - -sticky w -pady 5
+    entry $top.argscmd -width 50 -textvariable newviewargscmd($n) \
+	-background white
+    grid $top.argscmd - -sticky ew -padx 5
+
     message $top.l -aspect 1000 \
 	-text [mc "Enter files and directories to include, one per line:"]
     grid $top.l - -sticky w
@@ -1948,7 +1968,7 @@ proc allviewmenus {n op args} {
 proc newviewok {top n} {
     global nextviewnum newviewperm newviewname newishighlight
     global viewname viewfiles viewperm selectedview curview
-    global viewargs newviewargs viewhlmenu
+    global viewargs newviewargs viewargscmd newviewargscmd viewhlmenu
 
     if {[catch {
 	set newargs [shellsplit $newviewargs($n)]
@@ -1972,6 +1992,7 @@ proc newviewok {top n} {
 	set viewperm($n) $newviewperm($n)
 	set viewfiles($n) $files
 	set viewargs($n) $newargs
+	set viewargscmd($n) $newviewargscmd($n)
 	addviewmenu $n
 	if {!$newishighlight} {
 	    run showview $n
@@ -1988,9 +2009,11 @@ proc newviewok {top n} {
 	    # doviewmenu $viewhlmenu 1 [list addvhighlight $n] \
 		# entryconf [list -label $viewname($n) -value $viewname($n)]
 	}
-	if {$files ne $viewfiles($n) || $newargs ne $viewargs($n)} {
+	if {$files ne $viewfiles($n) || $newargs ne $viewargs($n) || \
+		$newviewargscmd($n) ne $viewargscmd($n)} {
 	    set viewfiles($n) $files
 	    set viewargs($n) $newargs
+	    set viewargscmd($n) $newviewargscmd($n)
 	    if {$curview == $n} {
 		run updatecommits
 	    }
@@ -8530,8 +8553,9 @@ set mergeonly 0
 set revtreeargs {}
 set cmdline_files {}
 set i 0
+set revtreeargscmd {}
 foreach arg $argv {
-    switch -- $arg {
+    switch -glob -- $arg {
 	"" { }
 	"-d" { set datemode 1 }
 	"--merge" {
@@ -8542,6 +8566,9 @@ foreach arg $argv {
 	    set cmdline_files [lrange $argv [expr {$i + 1}] end]
 	    break
 	}
+	"--argscmd=*" {
+	    set revtreeargscmd [string range $arg 10 end]
+	}
 	default {
 	    lappend revtreeargs $arg
 	}
@@ -8643,6 +8670,7 @@ set highlight_files {}
 set viewfiles(0) {}
 set viewperm(0) 0
 set viewargs(0) {}
+set viewargscmd(0) {}
 
 set cmdlineok 0
 set stopped 0
@@ -8658,14 +8686,15 @@ tkwait visibility .
 wm title . "[file tail $argv0]: [file tail [pwd]]"
 readrefs
 
-if {$cmdline_files ne {} || $revtreeargs ne {}} {
+if {$cmdline_files ne {} || $revtreeargs ne {} || $revtreeargscmd ne {}} {
     # create a view for the files/dirs specified on the command line
     set curview 1
     set selectedview 1
     set nextviewnum 2
     set viewname(1) [mc "Command line"]
     set viewfiles(1) $cmdline_files
     set viewargs(1) $revtreeargs
+    set viewargscmd(1) $revtreeargscmd
     set viewperm(1) 0
     addviewmenu 1
     .bar.view entryconf [mc "Edit view..."] -state normal
@@ -8679,6 +8708,7 @@ if {[info exists permviews]} {
 	set viewname($n) [lindex $v 0]
 	set viewfiles($n) [lindex $v 1]
 	set viewargs($n) [lindex $v 2]
+	set viewargscmd($n) [lindex $v 3]
 	set viewperm($n) 1
 	addviewmenu $n
     }