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[PATCH v2 1/2] gitk: show part of submodule log instead of empty pane when listing trees




From: Alex Riesen <raa.lkml@xxxxxxxxx>

Currently, selecting a name in the file list (bottom right) panel in
"Tree" mode does not do anything useful if the name is a submodule.
If gitk is currently showing a commit, the submodule names are not shown
at all (which is very confusing). If the gitk is showing the uncached
change, the submodules are shown, but focusing a submodule name causes a
Tcl error to appear. And finally, if gitk shows the index, the submodule
is presented as its bare name in the diff/file contents panel.

This change will show the first arbitrarily chosen number of commits.

Signed-off-by: Alex Riesen <raa.lkml@xxxxxxxxx>
---
 gitk | 44 ++++++++++++++++++++++++++++++++++----------
 1 file changed, 34 insertions(+), 10 deletions(-)

diff --git a/gitk b/gitk
index a14d7a1..742f36b 100755
--- a/gitk
+++ b/gitk
@@ -7627,9 +7627,10 @@ proc gettreeline {gtf id} {
 	    if {$i < 0} continue
 	    set fname [string range $line [expr {$i+1}] end]
 	    set line [string range $line 0 [expr {$i-1}]]
-	    if {$diffids ne $nullid2 && [lindex $line 1] ne "blob"} continue
+	    set objtype [lindex $line 1]
+	    if {$diffids ne $nullid2 && $objtype ne "blob" && $objtype ne "commit" } { continue }
 	    set sha1 [lindex $line 2]
-	    lappend treeidlist($id) $sha1
+	    lappend treeidlist($id) "$sha1 $objtype"
 	}
 	if {[string index $fname 0] eq "\""} {
 	    set fname [lindex $fname 0]
@@ -7659,21 +7660,44 @@ proc showfile {f} {
     global ctext_file_names ctext_file_lines
     global ctext commentend
 
+    set submodlog "log --format=%h\\ %aN:\\ %s -100"
+    set fcmt ""
     set i [lsearch -exact $treefilelist($diffids) $f]
     if {$i < 0} {
 	puts "oops, $f not in list for id $diffids"
 	return
     }
     if {$diffids eq $nullid} {
-	if {[catch {set bf [open $f r]} err]} {
-	    puts "oops, can't read $f: $err"
-	    return
+	if {[file isdirectory $f]} {
+	    # a submodule
+	    set qf [shellquote $f]
+	    if {[catch {set bf [open "| git -C $qf $submodlog" r]} err]} {
+		puts "oops, can't read submodule $f: $err"
+		return
+	    }
+        } else {
+	    if {[catch {set bf [open $f r]} err]} {
+		puts "oops, can't read $f: $err"
+		return
+	    }
 	}
     } else {
-	set blob [lindex $treeidlist($diffids) $i]
-	if {[catch {set bf [open [concat | git cat-file blob $blob] r]} err]} {
-	    puts "oops, error reading blob $blob: $err"
-	    return
+	set bo [lindex $treeidlist($diffids) $i]
+	set blob [lindex $bo 0]
+	set objtype [lindex $bo 1]
+	if { "$objtype" eq "blob" } {
+	    if {[catch {set bf [open [concat | git cat-file blob $blob] r]} err]} {
+		puts "oops, error reading blob $blob: $err"
+		return
+	    }
+	} else {
+	    # also a submodule
+	    set qf [shellquote $f]
+	    if {[catch {set bf [open "| git -C $qf $submodlog $blob" r]} err]} {
+		puts "oops, error reading submodule commit: $err"
+		return
+	    }
+	    set fcmt "/"
 	}
     }
     fconfigure $bf -blocking 0 -encoding [get_path_encoding $f]
@@ -7683,7 +7707,7 @@ proc showfile {f} {
     lappend ctext_file_names $f
     lappend ctext_file_lines [lindex [split $commentend "."] 0]
     $ctext insert end "\n"
-    $ctext insert end "$f\n" filesep
+    $ctext insert end "$f$fcmt\n" filesep
     $ctext config -state disabled
     $ctext yview $commentend
     settabs 0
-- 
2.17.0.593.g2029711e64


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