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#!/bin/sh
# git-difftool-helper is a GIT_EXTERNAL_DIFF-compatible diff tool launcher.
# This script is typically launched by using the 'git difftool'
# convenience command.
#
# Copyright (c) 2009 David Aguilar
# Set GIT_DIFFTOOL_NO_PROMPT to bypass the per-file prompt.
should_prompt () {
test -z "$GIT_DIFFTOOL_NO_PROMPT"
}
# This function prepares temporary files and launches the appropriate
# merge tool.
launch_merge_tool () {
# Merged is the filename as it appears in the work tree
# Local is the contents of a/filename
# Remote is the contents of b/filename
# Custom merge tool commands might use $BASE so we provide it
MERGED="$1"
LOCAL="$2"
REMOTE="$3"
BASE="$1"
# $LOCAL and $REMOTE are temporary files so prompt
# the user with the real $MERGED name before launching $merge_tool.
if should_prompt; then
printf "\nViewing: '$MERGED'\n"
printf "Hit return to launch '%s': " "$merge_tool"
read ans
fi
# Run the appropriate merge tool command
case "$merge_tool" in
kdiff3)
basename=$(basename "$MERGED")
"$merge_tool_path" --auto \
--L1 "$basename (A)" \
--L2 "$basename (B)" \
"$LOCAL" "$REMOTE" \
> /dev/null 2>&1
;;
kompare)
"$merge_tool_path" "$LOCAL" "$REMOTE"
;;
tkdiff)
"$merge_tool_path" "$LOCAL" "$REMOTE"
;;
meld)
"$merge_tool_path" "$LOCAL" "$REMOTE"
;;
diffuse)
"$merge_tool_path" "$LOCAL" "$REMOTE" | cat
;;
vimdiff)
"$merge_tool_path" -d -c "wincmd l" "$LOCAL" "$REMOTE"
;;
gvimdiff)
"$merge_tool_path" -d -c "wincmd l" -f "$LOCAL" "$REMOTE"
;;
xxdiff)
"$merge_tool_path" \
-R 'Accel.Search: "Ctrl+F"' \
-R 'Accel.SearchForward: "Ctrl-G"' \
"$LOCAL" "$REMOTE"
;;
opendiff)
"$merge_tool_path" "$LOCAL" "$REMOTE" | cat
;;
ecmerge)
"$merge_tool_path" "$LOCAL" "$REMOTE" \
--default --mode=merge2 --to="$MERGED"
;;
emerge)
"$merge_tool_path" -f emerge-files-command \
"$LOCAL" "$REMOTE" "$(basename "$MERGED")"
;;
*)
if test -n "$merge_tool_cmd"; then
( eval $merge_tool_cmd )
fi
;;
esac
}
# Verifies that (difftool|mergetool).<tool>.cmd exists
valid_custom_tool() {
merge_tool_cmd="$(git config difftool.$1.cmd)"
test -z "$merge_tool_cmd" &&
merge_tool_cmd="$(git config mergetool.$1.cmd)"
test -n "$merge_tool_cmd"
}
# Verifies that the chosen merge tool is properly setup.
# Built-in merge tools are always valid.
valid_tool() {
case "$1" in
kdiff3 | kompare | tkdiff | xxdiff | meld | opendiff | emerge | vimdiff | gvimdiff | ecmerge)
;; # happy
*)
if ! valid_custom_tool "$1"
then
return 1
fi
;;
esac
}
# Sets up the merge_tool_path variable.
# This handles the difftool.<tool>.path configuration.
# This also falls back to mergetool defaults.
init_merge_tool_path() {
merge_tool_path=$(git config difftool."$1".path)
test -z "$merge_tool_path" &&
merge_tool_path=$(git config mergetool."$1".path)
if test -z "$merge_tool_path"; then
case "$1" in
vimdiff)
merge_tool_path=vim
;;
gvimdiff)
merge_tool_path=gvim
;;
emerge)
merge_tool_path=emacs
;;
*)
merge_tool_path="$1"
;;
esac
fi
}
# Allow GIT_DIFF_TOOL and GIT_MERGE_TOOL to provide default values
test -n "$GIT_MERGE_TOOL" && merge_tool="$GIT_MERGE_TOOL"
test -n "$GIT_DIFF_TOOL" && merge_tool="$GIT_DIFF_TOOL"
# If merge tool was not specified then use the diff.tool
# configuration variable. If that's invalid then reset merge_tool.
# Fallback to merge.tool.
if test -z "$merge_tool"; then
merge_tool=$(git config diff.tool)
test -z "$merge_tool" &&
merge_tool=$(git config merge.tool)
if test -n "$merge_tool" && ! valid_tool "$merge_tool"; then
echo >&2 "git config option diff.tool set to unknown tool: $merge_tool"
echo >&2 "Resetting to default..."
unset merge_tool
fi
fi
# Try to guess an appropriate merge tool if no tool has been set.
if test -z "$merge_tool"; then
# We have a $DISPLAY so try some common UNIX merge tools
if test -n "$DISPLAY"; then
# If gnome then prefer meld, otherwise, prefer kdiff3 or kompare
if test -n "$GNOME_DESKTOP_SESSION_ID" ; then
merge_tool_candidates="meld kdiff3 kompare tkdiff xxdiff gvimdiff diffuse"
else
merge_tool_candidates="kdiff3 kompare tkdiff xxdiff meld gvimdiff diffuse"
fi
fi
if echo "${VISUAL:-$EDITOR}" | grep 'emacs' > /dev/null 2>&1; then
# $EDITOR is emacs so add emerge as a candidate
merge_tool_candidates="$merge_tool_candidates emerge opendiff vimdiff"
elif echo "${VISUAL:-$EDITOR}" | grep 'vim' > /dev/null 2>&1; then
# $EDITOR is vim so add vimdiff as a candidate
merge_tool_candidates="$merge_tool_candidates vimdiff opendiff emerge"
else
merge_tool_candidates="$merge_tool_candidates opendiff emerge vimdiff"
fi
echo "merge tool candidates: $merge_tool_candidates"
# Loop over each candidate and stop when a valid merge tool is found.
for i in $merge_tool_candidates
do
init_merge_tool_path $i
if type "$merge_tool_path" > /dev/null 2>&1; then
merge_tool=$i
break
fi
done
if test -z "$merge_tool" ; then
echo "No known merge resolution program available."
exit 1
fi
else
# A merge tool has been set, so verify that it's valid.
if ! valid_tool "$merge_tool"; then
echo >&2 "Unknown merge tool $merge_tool"
exit 1
fi
init_merge_tool_path "$merge_tool"
if test -z "$merge_tool_cmd" && ! type "$merge_tool_path" > /dev/null 2>&1; then
echo "The merge tool $merge_tool is not available as '$merge_tool_path'"
exit 1
fi
fi
# Launch the merge tool on each path provided by 'git diff'
while test $# -gt 6
do
launch_merge_tool "$1" "$2" "$5"
shift 7
done
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