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" 2>/dev/null' 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/$right_dir"
 180
 181 # Populate the tmp/right_dir directory with the files to be compared
 182 if test -n "$right"
 183 then
 184         while read name
 185         do
 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         done < "$tmp/filelist"
 193 elif test -n "$compare_staged"
 194 then
 195         while read name
 196         do
 197                 ls_list=$(git ls-files -- "$name")
 198                 if test -n "$ls_list"
 199                 then
 200                         mkdir -p "$tmp/$right_dir/$(dirname "$name")"
 201                         git show :"$name" >"$tmp/$right_dir/$name"
 202                 fi
 203         done < "$tmp/filelist"
 204 else
 205         # Mac users have gnutar rather than tar
 206         (tar --ignore-failed-read -c -T "$tmp/filelist" | (cd "$tmp/$right_dir" && tar -x)) || {
 207                 gnutar --ignore-failed-read -c -T "$tmp/filelist" | (cd "$tmp/$right_dir" && gnutar -x)
 208         }
 209 fi
 210
 211 # Populate the tmp/left_dir directory with the files to be compared
 212 while read name
 213 do
 214         if test -n "$left"
 215         then
 216                 ls_list=$(git ls-tree $left "$name")
 217                 if test -n "$ls_list"
 218                 then
 219                         mkdir -p "$tmp/$left_dir/$(dirname "$name")"
 220                         git show "$left":"$name" >"$tmp/$left_dir/$name" || true
 221                 fi
 222         else
 223                 if test -n "$compare_staged"
 224                 then
 225                         ls_list=$(git ls-tree HEAD "$name")
 226                         if test -n "$ls_list"
 227                         then
 228                                 mkdir -p "$tmp/$left_dir/$(dirname "$name")"
 229                                 git show HEAD:"$name" >"$tmp/$left_dir/$name"
 230                         fi
 231                 else
 232                         mkdir -p "$tmp/$left_dir/$(dirname "$name")"
 233                         git show :"$name" >"$tmp/$left_dir/$name"
 234                 fi
 235         fi
 236 done < "$tmp/filelist"
 237
 238 cd "$tmp"
 239 LOCAL="$left_dir"
 240 REMOTE="$right_dir"
 241
 242 if test -n "$diff_tool"
 243 then
 244         export BASE
 245         eval $diff_tool '"$LOCAL"' '"$REMOTE"'
 246 else
 247         run_merge_tool "$merge_tool" false
 248 fi
 249
 250 # Copy files back to the working dir, if requested
 251 if test -n "$copy_back" && test "$right_dir" = "working_tree"
 252 then
 253         cd "$start_dir"
 254         git_top_dir=$(git rev-parse --show-toplevel)
 255         find "$tmp/$right_dir" -type f |
 256         while read file
 257         do
 258                 cp "$file" "$git_top_dir/${file#$tmp/$right_dir/}"
 259         done
 260 fi