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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, 2010 David Aguilar
TOOL_MODE=diff
. git-mergetool--lib
# difftool.prompt controls the default prompt/no-prompt behavior
# and is overridden with $GIT_DIFFTOOL*_PROMPT.
should_prompt () {
prompt_merge=$(git config --bool mergetool.prompt || echo true)
prompt=$(git config --bool difftool.prompt || echo $prompt_merge)
if test "$prompt" = true
then
test -z "$GIT_DIFFTOOL_NO_PROMPT"
else
test -n "$GIT_DIFFTOOL_PROMPT"
fi
}
# Indicates that --extcmd=... was specified
use_ext_cmd () {
test -n "$GIT_DIFFTOOL_EXTCMD"
}
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 $merge_tool.
if should_prompt
then
printf "\nViewing (%s/%s): '%s'\n" "$GIT_DIFF_PATH_COUNTER" \
"$GIT_DIFF_PATH_TOTAL" "$MERGED"
if use_ext_cmd
then
printf "Launch '%s' [Y/n]? " \
"$GIT_DIFFTOOL_EXTCMD"
else
printf "Launch '%s' [Y/n]? " "$merge_tool"
fi
read ans || return
if test "$ans" = n
then
return
fi
fi
if use_ext_cmd
then
export BASE
eval $GIT_DIFFTOOL_EXTCMD '"$LOCAL"' '"$REMOTE"'
else
initialize_merge_tool "$merge_tool"
# ignore the error from the above --- run_merge_tool
# will diagnose unusable tool by itself
run_merge_tool "$merge_tool"
fi
}
if ! use_ext_cmd
then
if test -n "$GIT_DIFF_TOOL"
then
merge_tool="$GIT_DIFF_TOOL"
else
merge_tool="$(get_merge_tool)"
subshell_exit_status=$?
if test $subshell_exit_status -gt 1
then
exit $subshell_exit_status
fi
fi
fi
if test -n "$GIT_DIFFTOOL_DIRDIFF"
then
LOCAL="$1"
REMOTE="$2"
initialize_merge_tool "$merge_tool"
# ignore the error from the above --- run_merge_tool
# will diagnose unusable tool by itself
run_merge_tool "$merge_tool" false
else
# Launch the merge tool on each path provided by 'git diff'
while test $# -gt 6
do
launch_merge_tool "$1" "$2" "$5"
status=$?
if test $status -ge 126
then
# Command not found (127), not executable (126) or
# exited via a signal (>= 128).
exit $status
fi
if test "$status" != 0 &&
test "$GIT_DIFFTOOL_TRUST_EXIT_CODE" = true
then
exit $status
fi
shift 7
done
fi
exit 0
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