[RFC PATCH 1/2] contrib: add git-submodule-grep.sh

[Chris Packham <judge.packham@gmail.com>]

A simple wrapper around 'git grep' that is submodule aware.

The advantage of this over "git submodule foreach 'git grep <pattern>'" is
that the results are presented with a path relative to the current
directory. Also this script will work from any subdirectory of any submodule
in the current superproject.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
---
 contrib/git-submodule-grep.sh |   35 +++++++++++++++++++++++++++++++++++
 1 files changed, 35 insertions(+), 0 deletions(-)
 create mode 100755 contrib/git-submodule-grep.sh

diff --git a/contrib/git-submodule-grep.sh b/contrib/git-submodule-grep.sh
new file mode 100755
index 0000000..407fdb0
--- /dev/null
+++ b/contrib/git-submodule-grep.sh
@@ -0,0 +1,35 @@
+#!/bin/sh
+# Copyright (c) 2010, Chris Packham
+# Wrapper for git grep that is submodule aware
+
+SUBDIRECTORY_OK="yes"
+. git-sh-setup
+
+submodule_root_relative()
+{
+	ceiling="$HOME"
+	while test ! -e "$cdup.gitmodules"; do
+		cdup="$cdup../"
+		if test "$(cd $cdup && pwd)" == "$ceiling"; then
+			echo >&2 "fatal: failed to find superproject root,"
+			echo >&2 "       stopped searching at $ceiling."
+			exit 1
+		fi
+	done
+	echo "$cdup"
+}
+
+submodule_root()
+{
+	(cd "$(submodule_root_relative)" && pwd)
+}
+
+# we don't do anything with the arg but we should check that we
+# have something to pass to git grep
+test $# -lt 1 && die "fatal: no pattern given."
+
+prefix="$(submodule_root_relative)" || exit 1
+(cd "./$prefix"; \
+	git submodule --quiet foreach \
+		"git --no-pager grep $@ | sed s\"|.*|$prefix\$path/&|\" || true") \
+			| git_pager
-- 
1.7.3.dirty