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 $merge_tool.
  41         if should_prompt
  42         then
  43                 printf "\nViewing (%s/%s): '%s'\n" "$GIT_DIFF_PATH_COUNTER" \
  44                         "$GIT_DIFF_PATH_TOTAL" "$MERGED"
  45                 if use_ext_cmd
  46                 then
  47                         printf "Launch '%s' [Y/n]: " \
  48                                 "$GIT_DIFFTOOL_EXTCMD"
  49                 else
  50                         printf "Launch '%s' [Y/n]: " "$merge_tool"
  51                 fi
  52                 if read ans && test "$ans" = n
  53                 then
  54                         return
  55                 fi
  56         fi
  57
  58         if use_ext_cmd
  59         then
  60                 export BASE
  61                 eval $GIT_DIFFTOOL_EXTCMD '"$LOCAL"' '"$REMOTE"'
  62         else
  63                 run_merge_tool "$merge_tool"
  64         fi
  65 }
  66
  67 if ! use_ext_cmd
  68 then
  69         if test -n "$GIT_DIFF_TOOL"
  70         then
  71                 merge_tool="$GIT_DIFF_TOOL"
  72         else
  73                 merge_tool="$(get_merge_tool)" || exit
  74         fi
  75 fi
  76
  77 if test -n "$GIT_DIFFTOOL_DIRDIFF"
  78 then
  79         LOCAL="$1"
  80         REMOTE="$2"
  81         run_merge_tool "$merge_tool" false
  82 else
  83         # Launch the merge tool on each path provided by 'git diff'
  84         while test $# -gt 6
  85         do
  86                 launch_merge_tool "$1" "$2" "$5"
  87                 shift 7
  88         done
  89 fi