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# A better vimdiff mergetool for Git
# Git does a great job resolving merge conflicts automatically but there are
# times when human intervention is still needed. Git resolves all the conflicts
# that it is able to and finally wraps each conflict it cannot resolve within
# special markers which must be resolved by a human.
# The vertical format and lack of syntax highlighting in the plain conflict
# marker layout makes it difficult to spot subtle conflicts such as
# single-character changes and this is where a two-way diff really shines!
# To see this explained using screenshots, see:
# This script, when used as a Git mergetool, opens each "side" of the conflict
# markers in a two-way vimdiff window. This combines all the awesome of Git's
# automatic merging savvy with the awesome and simplicity of a simple two-way
# diff.
# Add this mergetool to your ~/.gitconfig (you can substitute gvim for vim):
# git config --global merge.tool diffconflicts
# git config --global mergetool.diffconflicts.cmd 'diffconflicts vim $BASE $LOCAL $REMOTE $MERGED'
# git config --global mergetool.diffconflicts.trustExitCode true
# git config --global mergetool.diffconflicts.keepBackup false
# The next time you perform a merge with conflicts, invoke this tool with the
# following command. (Of course you can set it as your default mergetool as
# well.)
# git mergetool --tool diffconflicts
# This tool will open three tabs in Vim that each provide a different way to
# view the conflicts. You can resolve the conflicts in the first tab and save
# and exit the file. This will also mark the conflict as resolved in Git.
# Tab1 is a two-way diff of just the conflicts. Resolve the conflicts here
# and save the file.
# +--------------------------------+
# +--------------------------------+
# Tab2 is a three-way diff of the original files and the merge base. This is
# the traditional three-way diff. Although noisy, it is occasionally useful
# to view the three original states of the conflicting file before the merge.
# +--------------------------------+
# +--------------------------------+
# Tab3 is the in-progress merge that Git has written to the filesystem
# containing the conflict markers. I.e., the file you would normally edit by
# hand when not using a mergetool.
# +--------------------------------+
# | <<<<<<< HEAD |
# | LCONFL |
# | ======= |
# | RCONFL |
# | >>>>>>> someref |
# +--------------------------------+
# Workflow:
# 1. Save your changes to the LCONFL temporary file (the left window on the
# first tab; also the only file that isn't read-only).
# 2. The LOCAL, BASE, and REMOTE versions of the file are available in the
# second tabpage if you want to look at them.
# 3. When vimdiff exits cleanly, the file containing the conflict markers
# will be updated with the contents of your LCONFL file edits.
# NOTE: Use :cq to abort the merge and exit Vim with an error code.
if [[ -z $@ || $# != "5" ]] ; then
echo -e "Usage: $0 \$EDITOR \$BASE \$LOCAL \$REMOTE \$MERGED"
exit 1
printf -v QBASE '%q' "${BASE}"
printf -v QLOCAL '%q' "${LOCAL}"
printf -v QREMOTE '%q' "${REMOTE}"
printf -v QMERGED '%q' "${MERGED}"
# Use gnu sed if on OSX for better portability (brew install gnu-sed)
type $GNU_SED >/dev/null 2>&1 || GNU_SED="sed"
# Temporary files for left and right side, keeping file extensions for syntax highlighting
MERGED_PATH="$(dirname ${MERGED})"
MERGED_FILE="$(basename ${MERGED})"
# Always delete our temp files; Git will handle it's own temp files
trap 'rm -f "'"${LCONFL}"'" "'"${RCONFL}"'"' SIGINT SIGTERM EXIT
# Remove the conflict markers for each 'side' and put each into a temp file
$GNU_SED -r -e '/^<<<<<<< /,/^=======\r?$/d' -e '/^>>>>>>> /d' "${MERGED}" > "${LCONFL}"
$GNU_SED -r -e '/^=======\r?$/,/^>>>>>>> /d' -e '/^<<<<<<< /d' "${MERGED}" > "${RCONFL}"
# Fire up vimdiff
$cmd -f -R -d "${LCONFL}" "${RCONFL}" \
-c ":set noro" \
-c ":tabe $QLOCAL" -c ":vert diffs $QBASE" -c ":vert diffs $QREMOTE" \
-c ":winc t" -c ":tabe $QMERGED" -c ":tabfir"
# Overwrite $MERGED only if vimdiff exits cleanly.
if [[ $EC == "0" ]] ; then
cat "${LCONFL}" > "${MERGED}"
exit $EC
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