From 55578f0151f8c274a8a1fc0cf62e0220bc722d81 Mon Sep 17 00:00:00 2001
From: Petr Baudis <pasky@suse.cz>
Date: Thu, 16 Oct 2008 12:35:16 +0200
Subject: [PATCH] tg summary --graphviz: Dot-suitable dependency graph

Inspired by Antonio Ospite <ospite@studenti.unina.it>'s tg-graphviz.sh.
---
 README        |  6 ++++--
 tg-summary.sh | 35 ++++++++++++++++++++++++++++++++++-
 2 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/README b/README
index dbf12ed..ece1d02 100644
--- a/README
+++ b/README
@@ -333,10 +333,12 @@ tg summary
 
 	This can take long time to accurately determine all the relevant
 	information about each branch; you can pass '-t' to get just
-	terse list of topic branch names quickly.
+	terse list of topic branch names quickly. Alternately, you can
+	pass '--graphviz' to get a dot-suitable output to draw a dependency
+	graph between the topic branches.
 
 	TODO: Speed up by an order of magnitude
-	TODO: Graph view
+	TODO: Text graph view
 
 tg export
 ~~~~~~~~~
diff --git a/tg-summary.sh b/tg-summary.sh
index 3905bdc..3c90a6b 100644
--- a/tg-summary.sh
+++ b/tg-summary.sh
@@ -4,6 +4,7 @@
 # GPLv2
 
 terse=
+graphviz=
 
 
 ## Parse options
@@ -13,14 +14,36 @@ while [ -n "$1" ]; do
 	case "$arg" in
 	-t)
 		terse=1;;
+	--graphviz)
+		graphviz=1;;
 	*)
-		echo "Usage: tg [...] summary [-t]" >&2
+		echo "Usage: tg [...] summary [-t | --graphviz]" >&2
 		exit 1;;
 	esac
 done
 
 curname="$(git symbolic-ref HEAD | sed 's#^refs/\(heads\|top-bases\)/##')"
 
+if [ -n "$graphviz" ]; then
+	cat <<EOT
+# GraphViz output; pipe to:
+#   | dot -Tpng -o <ouput>
+# or
+#   | dot -Txlib
+
+digraph G {
+
+graph [
+  rankdir = "TB"
+  label="TopGit Layout\n\n\n"
+  fontsize = 14
+  labelloc=top
+  pad = "0.5,0.5"
+];
+
+EOT
+fi
+
 
 ## List branches
 
@@ -31,6 +54,12 @@ git for-each-ref refs/top-bases |
 			echo "$name"
 			continue
 		fi
+		if [ -n "$graphviz" ]; then
+			git cat-file blob "$name:.topdeps" | while read dep; do
+				echo "\"$name\" -> \"$dep\";"
+			done
+			continue
+		fi
 
 		missing_deps=
 
@@ -65,3 +94,7 @@ git for-each-ref refs/top-bases |
 		printf '%s\t%-31s\t%s\n' "$current$nonempty$remote$rem_update$deps_update$deps_missing$base_update" \
 			"$name" "$subject"
 	done
+
+if [ -n "$graphviz" ]; then
+	echo '}'
+fi
-- 
2.30.2