engine.pl: Fix a recent breakage of the buildsystem generator
[git/git.git] / git-difftool--helper.sh
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5c38ea31 1#!/bin/sh
afcbc8e7 2# git-difftool--helper is a GIT_EXTERNAL_DIFF-compatible diff tool launcher.
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3# This script is typically launched by using the 'git difftool'
4# convenience command.
5#
c8a5672e 6# Copyright (c) 2009, 2010 David Aguilar
5c38ea31 7
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8TOOL_MODE=diff
9. git-mergetool--lib
10
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11# difftool.prompt controls the default prompt/no-prompt behavior
12# and is overridden with $GIT_DIFFTOOL*_PROMPT.
5c38ea31 13should_prompt () {
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14 prompt=$(git config --bool difftool.prompt || echo true)
15 if test "$prompt" = true; then
16 test -z "$GIT_DIFFTOOL_NO_PROMPT"
17 else
18 test -n "$GIT_DIFFTOOL_PROMPT"
19 fi
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20}
21
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22# Indicates that --extcmd=... was specified
23use_ext_cmd () {
24 test -n "$GIT_DIFFTOOL_EXTCMD"
25}
26
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27launch_merge_tool () {
28 # Merged is the filename as it appears in the work tree
29 # Local is the contents of a/filename
30 # Remote is the contents of b/filename
31 # Custom merge tool commands might use $BASE so we provide it
32 MERGED="$1"
33 LOCAL="$2"
34 REMOTE="$3"
35 BASE="$1"
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36
37 # $LOCAL and $REMOTE are temporary files so prompt
38 # the user with the real $MERGED name before launching $merge_tool.
39 if should_prompt; then
40 printf "\nViewing: '$MERGED'\n"
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41 if use_ext_cmd; then
42 printf "Hit return to launch '%s': " \
43 "$GIT_DIFFTOOL_EXTCMD"
44 else
45 printf "Hit return to launch '%s': " "$merge_tool"
46 fi
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47 read ans
48 fi
49
1c6f5b52 50 if use_ext_cmd; then
9f3d54d1 51 eval $GIT_DIFFTOOL_EXTCMD '"$LOCAL"' '"$REMOTE"'
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52 else
53 run_merge_tool "$merge_tool"
54 fi
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55}
56
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57if ! use_ext_cmd; then
58 if test -n "$GIT_DIFF_TOOL"; then
59 merge_tool="$GIT_DIFF_TOOL"
60 else
61 merge_tool="$(get_merge_tool)" || exit
62 fi
47d65924 63fi
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64
65# Launch the merge tool on each path provided by 'git diff'
66while test $# -gt 6
67do
68 launch_merge_tool "$1" "$2" "$5"
69 shift 7
70done