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[git] / git-difftool--helper.sh
1 #!/bin/sh
2 # git-difftool--helper is a GIT_EXTERNAL_DIFF-compatible diff tool launcher.
3 # This script is typically launched by using the 'git difftool'
4 # convenience command.
5 #
6 # Copyright (c) 2009, 2010 David Aguilar
7
8 TOOL_MODE=diff
9 . git-mergetool--lib
10
11 # difftool.prompt controls the default prompt/no-prompt behavior
12 # and is overridden with $GIT_DIFFTOOL*_PROMPT.
13 should_prompt () {
14         prompt_merge=$(git config --bool mergetool.prompt || echo true)
15         prompt=$(git config --bool difftool.prompt || echo $prompt_merge)
16         if test "$prompt" = true
17         then
18                 test -z "$GIT_DIFFTOOL_NO_PROMPT"
19         else
20                 test -n "$GIT_DIFFTOOL_PROMPT"
21         fi
22 }
23
24 # Indicates that --extcmd=... was specified
25 use_ext_cmd () {
26         test -n "$GIT_DIFFTOOL_EXTCMD"
27 }
28
29 launch_merge_tool () {
30         # Merged is the filename as it appears in the work tree
31         # Local is the contents of a/filename
32         # Remote is the contents of b/filename
33         # Custom merge tool commands might use $BASE so we provide it
34         MERGED="$1"
35         LOCAL="$2"
36         REMOTE="$3"
37         BASE="$1"
38
39         # $LOCAL and $REMOTE are temporary files so prompt
40         # the user with the real $MERGED name before launching $merge_tool.
41         if should_prompt
42         then
43                 printf "\nViewing: '%s'\n" "$MERGED"
44                 if use_ext_cmd
45                 then
46                         printf "Launch '%s' [Y/n]: " \
47                                 "$GIT_DIFFTOOL_EXTCMD"
48                 else
49                         printf "Launch '%s' [Y/n]: " "$merge_tool"
50                 fi
51                 if read ans && test "$ans" = n
52                 then
53                         return
54                 fi
55         fi
56
57         if use_ext_cmd
58         then
59                 export BASE
60                 eval $GIT_DIFFTOOL_EXTCMD '"$LOCAL"' '"$REMOTE"'
61         else
62                 run_merge_tool "$merge_tool"
63         fi
64 }
65
66 if ! use_ext_cmd
67 then
68         if test -n "$GIT_DIFF_TOOL"
69         then
70                 merge_tool="$GIT_DIFF_TOOL"
71         else
72                 merge_tool="$(get_merge_tool)" || exit
73         fi
74 fi
75
76 if test -n "$GIT_DIFFTOOL_DIRDIFF"
77 then
78         LOCAL="$1"
79         REMOTE="$2"
80         run_merge_tool "$merge_tool" false
81 else
82         # Launch the merge tool on each path provided by 'git diff'
83         while test $# -gt 6
84         do
85                 launch_merge_tool "$1" "$2" "$5"
86                 shift 7
87         done
88 fi