tg summary --graphviz: Dot-suitable dependency graph

Inspired by Antonio Ospite <ospite@studenti.unina.it>'s tg-graphviz.sh.

diff --git a/README b/README
index dbf12eddf696b2720cef5a5605c3b7ea57fb32f7..ece1d029c6572dd46099af6ef4b6185aa8c62fde 100644 (file)
--- 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 3905bdce7dc1d934a7862c025c4fb772c52660d6..3c90a6b5952e526bac9da80e84386d6abf6246a8 100644 (file)
--- 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