git-gui: Refactor Henrik Nyh's logo into its own procedure

By moving the logo into its own procedure we can use it in
multiple locations within the UI, but still load it only if
the logo is going to be used by the application.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

lib/choose_repository.tcl

@@ -3,38 +3,6 @@
 
 class choose_repository {
 
-# Henrik Nyh's alternative Git logo, from his blog post
-# http://henrik.nyh.se/2007/06/alternative-git-logo-and-favicon
-#
-image create photo ::choose_repository::git_logo -data {
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-}
-
 field top
 field w
 field w_body      ; # Widget holding the center content
@@ -92,12 +60,7 @@ constructor pick {} {
 		bind $top <Key-Escape> [list destroy $top]
 	}
 
-	label $w.git_logo \
-		-borderwidth 1 \
-		-relief sunken \
-		-background white \
-		-image ::choose_repository::git_logo
-	pack $w.git_logo -side left -fill y -padx 10 -pady 10
+	pack [git_logo $w.git_logo] -side left -fill y -padx 10 -pady 10
 
 	set w_body $w.body
 	frame $w_body

lib/logo.tcl

+# git-gui Git Gui logo
+# Copyright (C) 2007 Shawn Pearce
+
+# Henrik Nyh's alternative Git logo, from his blog post
+# http://henrik.nyh.se/2007/06/alternative-git-logo-and-favicon
+#
+image create photo ::git_logo_data -data {
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+}
+
+proc git_logo {w} {
+	label $w \
+		-borderwidth 1 \
+		-relief sunken \
+		-background white \
+		-image ::git_logo_data
+	return $w
+}