Bash snippet to show branch and patch in bash prompt

Modified according to Eran Tromer's suggestions. Also added some personal
preference to the default PS1 but people should really adapt this to their
needs.

Signed-off-by: Robin Rosenberg <robin.rosenberg@dewire.com>

diff --git a/contrib/stgbashprompt.sh b/contrib/stgbashprompt.sh
new file mode 100755 (executable)
index 0000000..16bb39b
--- /dev/null
+++ b/contrib/stgbashprompt.sh
@@ -0,0 +1,16 @@
+# modify PS1 to your preference and include this file in your bashrc
+# or copy to /etc/bash_completions.d.
+
+if [ "$PS1" ]; then
+       function __prompt_git()
+       {
+               local git_dir ref br top;
+               git_dir=$(git-rev-parse --git-dir 2> /dev/null) || return
+               ref=$(git-symbolic-ref HEAD 2> /dev/null) || return
+               br=${ref#refs/heads/}
+               top=$(cat $git_dir/patches/$br/current 2>/dev/null) \
+                       && top="/$top"
+               echo "[$br$top]"
+       }
+       PS1='\u@\h:$(__prompt_git)\W\$ '
+fi