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#!/bin/bash
#
# git-svn-diff originally by (http://mojodna.net/2009/02/24/my-work-git-workflow.html)
# modified by mike@mikepearce.net
# modified by aconway@[redacted] - handle diffs that introduce new files
# modified by t.broyer@ltgt.net - fixes diffs that introduce new files
# modified by m@rkj.me - fix sed syntax issue in OS X
# modified by dertom - fix new file-bug. Whitespace mandatory for new file '+++ file.c'
#
# Generate an SVN-compatible diff against the tip of the tracking branch
# Get the tracking branch (if we're on a branch)
TRACKING_BRANCH=`git svn info | grep URL | sed -e 's/.*\/branches\///'`
# If the tracking branch has 'URL' at the beginning, then the sed wasn't successful and
# we'll fall back to the svn-remote config option
if [[ "$TRACKING_BRANCH" =~ URL.* ]]
then
TRACKING_BRANCH=`git config --get svn-remote.svn.fetch | sed -e 's/.*:refs\/remotes\///'`
fi
# Get the highest revision number
REV=`git svn find-rev $(git rev-list --date-order --max-count=1 $TRACKING_BRANCH)`
# Then do the diff from the highest revision on the current branch
# and masssage into SVN format
git diff --no-prefix $(git rev-list --date-order --max-count=1 $TRACKING_BRANCH) $* |
sed -e "/--- \/dev\/null/{ N; s|^--- /dev/null\n+++ \(.*\)|--- \1 (revision 0)\n+++ \1 (revision 0)|;}" \
-e "s/^--- .*/& (revision $REV)/" \
-e "s/^+++ .*/& (working copy)/" \
-e "s/^diff --git [^[:space:]]*/Index:/" \
-e "s/^index.*/===================================================================/"
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