contrib/diffall/git-diffall

   1 #!/bin/sh
   2 # Copyright 2010 - 2012, Tim Henigan <tim.henigan@gmail.com>
   3 #
   4 # Perform a directory diff between commits in the repository using
   5 # the external diff or merge tool specified in the user's config.
   6
   7 USAGE='[--cached] [--copy-back] [-x|--extcmd=<command>] <commit>{0,2} [-- <path>*]
   8
   9     --cached     Compare to the index rather than the working tree.
  10
  11     --copy-back  Copy files back to the working tree when the diff
  12                  tool exits (in case they were modified by the
  13                  user).  This option is only valid if the diff
  14                  compared with the working tree.
  15
  16     -x=<command>
  17     --extcmd=<command>  Specify a custom command for viewing diffs.
  18                  git-diffall ignores the configured defaults and
  19                  runs $command $LOCAL $REMOTE when this option is
  20                  specified. Additionally, $BASE is set in the
  21                  environment.
  22 '
  23
  24 SUBDIRECTORY_OK=1
  25 . "$(git --exec-path)/git-sh-setup"
  26
  27 TOOL_MODE=diff
  28 . "$(git --exec-path)/git-mergetool--lib"
  29
  30 merge_tool="$(get_merge_tool)"
  31 if test -z "$merge_tool"
  32 then
  33         echo "Error: Either the 'diff.tool' or 'merge.tool' option must be set."
  34         usage
  35 fi
  36
  37 start_dir=$(pwd)
  38
  39 # All the file paths returned by the diff command are relative to the root
  40 # of the working copy. So if the script is called from a subdirectory, it
  41 # must switch to the root of working copy before trying to use those paths.
  42 cdup=$(git rev-parse --show-cdup) &&
  43 cd "$cdup" || {
  44         echo >&2 "Cannot chdir to $cdup, the toplevel of the working tree"
  45         exit 1
  46 }
  47
  48 # set up temp dir
  49 tmp=$(perl -e 'use File::Temp qw(tempdir);
  50         $t=tempdir("/tmp/git-diffall.XXXXX") or exit(1);
  51         print $t') || exit 1
  52 trap 'rm -rf "$tmp"' EXIT
  53
  54 left=
  55 right=
  56 paths=
  57 dashdash_seen=
  58 compare_staged=
  59 merge_base=
  60 left_dir=
  61 right_dir=
  62 diff_tool=
  63 copy_back=
  64
  65 while test $# != 0
  66 do
  67         case "$1" in
  68         -h|--h|--he|--hel|--help)
  69                 usage
  70                 ;;
  71         --cached)
  72                 compare_staged=1
  73                 ;;
  74         --copy-back)
  75                 copy_back=1
  76                 ;;
  77         -x|--e|--ex|--ext|--extc|--extcm|--extcmd)
  78                 if test $# = 1
  79                 then
  80                         echo You must specify the tool for use with --extcmd
  81                         usage
  82                 else
  83                         diff_tool=$2
  84                         shift
  85                 fi
  86                 ;;
  87         --)
  88                 dashdash_seen=1
  89                 ;;
  90         -*)
  91                 echo Invalid option: "$1"
  92                 usage
  93                 ;;
  94         *)
  95                 # could be commit, commit range or path limiter
  96                 case "$1" in
  97                 *...*)
  98                         left=${1%...*}
  99                         right=${1#*...}
 100                         merge_base=1
 101                         ;;
 102                 *..*)
 103                         left=${1%..*}
 104                         right=${1#*..}
 105                         ;;
 106                 *)
 107                         if test -n "$dashdash_seen"
 108                         then
 109                                 paths="$paths$1 "
 110                         elif test -z "$left"
 111                         then
 112                                 left=$1
 113                         elif test -z "$right"
 114                         then
 115                                 right=$1
 116                         else
 117                                 paths="$paths$1 "
 118                         fi
 119                         ;;
 120                 esac
 121                 ;;
 122         esac
 123         shift
 124 done
 125
 126 # Determine the set of files which changed
 127 if test -n "$left" && test -n "$right"
 128 then
 129         left_dir="cmt-$(git rev-parse --short $left)"
 130         right_dir="cmt-$(git rev-parse --short $right)"
 131
 132         if test -n "$compare_staged"
 133         then
 134                 usage
 135         elif test -n "$merge_base"
 136         then
 137                 git diff --name-only "$left"..."$right" -- $paths >"$tmp/filelist"
 138         else
 139                 git diff --name-only "$left" "$right" -- $paths >"$tmp/filelist"
 140         fi
 141 elif test -n "$left"
 142 then
 143         left_dir="cmt-$(git rev-parse --short $left)"
 144
 145         if test -n "$compare_staged"
 146         then
 147                 right_dir="staged"
 148                 git diff --name-only --cached "$left" -- $paths >"$tmp/filelist"
 149         else
 150                 right_dir="working_tree"
 151                 git diff --name-only "$left" -- $paths >"$tmp/filelist"
 152         fi
 153 else
 154         left_dir="HEAD"
 155
 156         if test -n "$compare_staged"
 157         then
 158                 right_dir="staged"
 159                 git diff --name-only --cached -- $paths >"$tmp/filelist"
 160         else
 161                 right_dir="working_tree"
 162                 git diff --name-only -- $paths >"$tmp/filelist"
 163         fi
 164 fi
 165
 166 # Exit immediately if there are no diffs
 167 if test ! -s "$tmp/filelist"
 168 then
 169         exit 0
 170 fi
 171
 172 if test -n "$copy_back" && test "$right_dir" != "working_tree"
 173 then
 174         echo "--copy-back is only valid when diff includes the working tree."
 175         exit 1
 176 fi
 177
 178 # Create the named tmp directories that will hold the files to be compared
 179 mkdir -p "$tmp/$left_dir" "$tmp/$right_dir"
 180
 181 # Populate the tmp/right_dir directory with the files to be compared
 182 while read name
 183 do
 184         if test -n "$right"
 185         then
 186                 ls_list=$(git ls-tree $right "$name")
 187                 if test -n "$ls_list"
 188                 then
 189                         mkdir -p "$tmp/$right_dir/$(dirname "$name")"
 190                         git show "$right":"$name" >"$tmp/$right_dir/$name" || true
 191                 fi
 192         elif test -n "$compare_staged"
 193         then
 194                 ls_list=$(git ls-files -- "$name")
 195                 if test -n "$ls_list"
 196                 then
 197                         mkdir -p "$tmp/$right_dir/$(dirname "$name")"
 198                         git show :"$name" >"$tmp/$right_dir/$name"
 199                 fi
 200         else
 201                 if test -e "$name"
 202                 then
 203                         mkdir -p "$tmp/$right_dir/$(dirname "$name")"
 204                         cp "$name" "$tmp/$right_dir/$name"
 205                 fi
 206         fi
 207 done < "$tmp/filelist"
 208
 209 # Populate the tmp/left_dir directory with the files to be compared
 210 while read name
 211 do
 212         if test -n "$left"
 213         then
 214                 ls_list=$(git ls-tree $left "$name")
 215                 if test -n "$ls_list"
 216                 then
 217                         mkdir -p "$tmp/$left_dir/$(dirname "$name")"
 218                         git show "$left":"$name" >"$tmp/$left_dir/$name" || true
 219                 fi
 220         else
 221                 if test -n "$compare_staged"
 222                 then
 223                         ls_list=$(git ls-tree HEAD "$name")
 224                         if test -n "$ls_list"
 225                         then
 226                                 mkdir -p "$tmp/$left_dir/$(dirname "$name")"
 227                                 git show HEAD:"$name" >"$tmp/$left_dir/$name"
 228                         fi
 229                 else
 230                         mkdir -p "$tmp/$left_dir/$(dirname "$name")"
 231                         git show :"$name" >"$tmp/$left_dir/$name"
 232                 fi
 233         fi
 234 done < "$tmp/filelist"
 235
 236 LOCAL="$tmp/$left_dir"
 237 REMOTE="$tmp/$right_dir"
 238
 239 if test -n "$diff_tool"
 240 then
 241         export BASE
 242         eval $diff_tool '"$LOCAL"' '"$REMOTE"'
 243 else
 244         run_merge_tool "$merge_tool" false
 245 fi
 246
 247 # Copy files back to the working dir, if requested
 248 if test -n "$copy_back" && test "$right_dir" = "working_tree"
 249 then
 250         cd "$start_dir"
 251         git_top_dir=$(git rev-parse --show-toplevel)
 252         find "$tmp/$right_dir" -type f |
 253         while read file
 254         do
 255                 cp "$file" "$git_top_dir/${file#$tmp/$right_dir/}"
 256         done
 257 fi