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                 read ans || return
  53                 if test "$ans" = n
  54                 then
  55                         return
  56                 fi
  57         fi
  58
  59         if use_ext_cmd
  60         then
  61                 export BASE
  62                 eval $GIT_DIFFTOOL_EXTCMD '"$LOCAL"' '"$REMOTE"'
  63         else
  64                 initialize_merge_tool "$merge_tool"
  65                 # ignore the error from the above --- run_merge_tool
  66                 # will diagnose unusable tool by itself
  67                 run_merge_tool "$merge_tool"
  68         fi
  69 }
  70
  71 if ! use_ext_cmd
  72 then
  73         if test -n "$GIT_DIFF_TOOL"
  74         then
  75                 merge_tool="$GIT_DIFF_TOOL"
  76         else
  77                 merge_tool="$(get_merge_tool)"
  78                 subshell_exit_status=$?
  79                 if test $subshell_exit_status -gt 1
  80                 then
  81                         exit $subshell_exit_status
  82                 fi
  83         fi
  84 fi
  85
  86 if test -n "$GIT_DIFFTOOL_DIRDIFF"
  87 then
  88         LOCAL="$1"
  89         REMOTE="$2"
  90         initialize_merge_tool "$merge_tool"
  91         # ignore the error from the above --- run_merge_tool
  92         # will diagnose unusable tool by itself
  93         run_merge_tool "$merge_tool" false
  94 else
  95         # Launch the merge tool on each path provided by 'git diff'
  96         while test $# -gt 6
  97         do
  98                 launch_merge_tool "$1" "$2" "$5"
  99                 status=$?
 100                 if test $status -ge 126
 101                 then
 102                         # Command not found (127), not executable (126) or
 103                         # exited via a signal (>= 128).
 104                         exit $status
 105                 fi
 106
 107                 if test "$status" != 0 &&
 108                         test "$GIT_DIFFTOOL_TRUST_EXIT_CODE" = true
 109                 then
 110                         exit $status
 111                 fi
 112                 shift 7
 113         done
 114 fi
 115
 116 exit 0