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 $GIT_DIFFTOOL*_PROMPT.
  13 should_prompt () {
  14         prompt=$(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 "$GIT_DIFFTOOL_PROMPT"
  19         fi
  20 }
  21
  22 # Indicates that --extcmd=... was specified
  23 use_ext_cmd () {
  24         test -n "$GIT_DIFFTOOL_EXTCMD"
  25 }
  26
  27 launch_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"
  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"
  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
  47                 read ans
  48         fi
  49
  50         if use_ext_cmd; then
  51                 eval $GIT_DIFFTOOL_EXTCMD '"$LOCAL"' '"$REMOTE"'
  52         else
  53                 run_merge_tool "$merge_tool"
  54         fi
  55 }
  56
  57 if ! 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
  63 fi
  64
  65 # Launch the merge tool on each path provided by 'git diff'
  66 while test $# -gt 6
  67 do
  68         launch_merge_tool "$1" "$2" "$5"
  69         shift 7
  70 done