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 # needed to access tar utility
  40 cdup=$(git rev-parse --show-cdup) &&
  41 cd "$cdup" || {
  42         echo >&2 "Cannot chdir to $cdup, the toplevel of the working tree"
  43         exit 1
  44 }
  45
  46 # mktemp is not available on all platforms (missing from msysgit)
  47 # Use a hard-coded tmp dir if it is not available
  48 tmp="$(mktemp -d -t tmp.XXXXXX 2>/dev/null)" || {
  49         tmp=/tmp/git-diffall-tmp.$$
  50         mkdir "$tmp" || exit 1
  51 }
  52
  53 trap 'rm -rf "$tmp" 2>/dev/null' EXIT
  54
  55 left=
  56 right=
  57 paths=
  58 dashdash_seen=
  59 compare_staged=
  60 merge_base=
  61 left_dir=
  62 right_dir=
  63 diff_tool=
  64 copy_back=
  65
  66 while test $# != 0
  67 do
  68         case "$1" in
  69         -h|--h|--he|--hel|--help)
  70                 usage
  71                 ;;
  72         --cached)
  73                 compare_staged=1
  74                 ;;
  75         --copy-back)
  76                 copy_back=1
  77                 ;;
  78         -x|--e|--ex|--ext|--extc|--extcm|--extcmd)
  79                 if test $# = 1
  80                 then
  81                         echo You must specify the tool for use with --extcmd
  82                         usage
  83                 else
  84                         diff_tool=$2
  85                         shift
  86                 fi
  87                 ;;
  88         --)
  89                 dashdash_seen=1
  90                 ;;
  91         -*)
  92                 echo Invalid option: "$1"
  93                 usage
  94                 ;;
  95         *)
  96                 # could be commit, commit range or path limiter
  97                 case "$1" in
  98                 *...*)
  99                         left=${1%...*}
 100                         right=${1#*...}
 101                         merge_base=1
 102                         ;;
 103                 *..*)
 104                         left=${1%..*}
 105                         right=${1#*..}
 106                         ;;
 107                 *)
 108                         if test -n "$dashdash_seen"
 109                         then
 110                                 paths="$paths$1 "
 111                         elif test -z "$left"
 112                         then
 113                                 left=$1
 114                         elif test -z "$right"
 115                         then
 116                                 right=$1
 117                         else
 118                                 paths="$paths$1 "
 119                         fi
 120                         ;;
 121                 esac
 122                 ;;
 123         esac
 124         shift
 125 done
 126
 127 # Determine the set of files which changed
 128 if test -n "$left" && test -n "$right"
 129 then
 130         left_dir="cmt-$(git rev-parse --short $left)"
 131         right_dir="cmt-$(git rev-parse --short $right)"
 132
 133         if test -n "$compare_staged"
 134         then
 135                 usage
 136         elif test -n "$merge_base"
 137         then
 138                 git diff --name-only "$left"..."$right" -- $paths >"$tmp/filelist"
 139         else
 140                 git diff --name-only "$left" "$right" -- $paths >"$tmp/filelist"
 141         fi
 142 elif test -n "$left"
 143 then
 144         left_dir="cmt-$(git rev-parse --short $left)"
 145
 146         if test -n "$compare_staged"
 147         then
 148                 right_dir="staged"
 149                 git diff --name-only --cached "$left" -- $paths >"$tmp/filelist"
 150         else
 151                 right_dir="working_tree"
 152                 git diff --name-only "$left" -- $paths >"$tmp/filelist"
 153         fi
 154 else
 155         left_dir="HEAD"
 156
 157         if test -n "$compare_staged"
 158         then
 159                 right_dir="staged"
 160                 git diff --name-only --cached -- $paths >"$tmp/filelist"
 161         else
 162                 right_dir="working_tree"
 163                 git diff --name-only -- $paths >"$tmp/filelist"
 164         fi
 165 fi
 166
 167 # Exit immediately if there are no diffs
 168 if test ! -s "$tmp/filelist"
 169 then
 170         exit 0
 171 fi
 172
 173 if test -n "$copy_back" && test "$right_dir" != "working_tree"
 174 then
 175         echo "--copy-back is only valid when diff includes the working tree."
 176         exit 1
 177 fi
 178
 179 # Create the named tmp directories that will hold the files to be compared
 180 mkdir -p "$tmp/$left_dir" "$tmp/$right_dir"
 181
 182 # Populate the tmp/right_dir directory with the files to be compared
 183 if test -n "$right"
 184 then
 185         while read name
 186         do
 187                 ls_list=$(git ls-tree $right "$name")
 188                 if test -n "$ls_list"
 189                 then
 190                         mkdir -p "$tmp/$right_dir/$(dirname "$name")"
 191                         git show "$right":"$name" >"$tmp/$right_dir/$name" || true
 192                 fi
 193         done < "$tmp/filelist"
 194 elif test -n "$compare_staged"
 195 then
 196         while read name
 197         do
 198                 ls_list=$(git ls-files -- "$name")
 199                 if test -n "$ls_list"
 200                 then
 201                         mkdir -p "$tmp/$right_dir/$(dirname "$name")"
 202                         git show :"$name" >"$tmp/$right_dir/$name"
 203                 fi
 204         done < "$tmp/filelist"
 205 else
 206         # Mac users have gnutar rather than tar
 207         (tar --ignore-failed-read -c -T "$tmp/filelist" | (cd "$tmp/$right_dir" && tar -x)) || {
 208                 gnutar --ignore-failed-read -c -T "$tmp/filelist" | (cd "$tmp/$right_dir" && gnutar -x)
 209         }
 210 fi
 211
 212 # Populate the tmp/left_dir directory with the files to be compared
 213 while read name
 214 do
 215         if test -n "$left"
 216         then
 217                 ls_list=$(git ls-tree $left "$name")
 218                 if test -n "$ls_list"
 219                 then
 220                         mkdir -p "$tmp/$left_dir/$(dirname "$name")"
 221                         git show "$left":"$name" >"$tmp/$left_dir/$name" || true
 222                 fi
 223         else
 224                 if test -n "$compare_staged"
 225                 then
 226                         ls_list=$(git ls-tree HEAD "$name")
 227                         if test -n "$ls_list"
 228                         then
 229                                 mkdir -p "$tmp/$left_dir/$(dirname "$name")"
 230                                 git show HEAD:"$name" >"$tmp/$left_dir/$name"
 231                         fi
 232                 else
 233                         mkdir -p "$tmp/$left_dir/$(dirname "$name")"
 234                         git show :"$name" >"$tmp/$left_dir/$name"
 235                 fi
 236         fi
 237 done < "$tmp/filelist"
 238
 239 cd "$tmp"
 240 LOCAL="$left_dir"
 241 REMOTE="$right_dir"
 242
 243 if test -n "$diff_tool"
 244 then
 245         export BASE
 246         eval $diff_tool '"$LOCAL"' '"$REMOTE"'
 247 else
 248         run_merge_tool "$merge_tool" false
 249 fi
 250
 251 # Copy files back to the working dir, if requested
 252 if test -n "$copy_back" && test "$right_dir" = "working_tree"
 253 then
 254         cd "$start_dir"
 255         git_top_dir=$(git rev-parse --show-toplevel)
 256         find "$tmp/$right_dir" -type f |
 257         while read file
 258         do
 259                 cp "$file" "$git_top_dir/${file#$tmp/$right_dir/}"
 260         done
 261 fi