git-notes.sh

   1 #!/bin/sh
   2
   3 USAGE="(edit | show) [commit]"
   4 . git-sh-setup
   5
   6 test -n "$3" && usage
   7
   8 test -z "$1" && usage
   9 ACTION="$1"; shift
  10
  11 test -z "$GIT_NOTES_REF" && GIT_NOTES_REF="$(git config core.notesref)"
  12 test -z "$GIT_NOTES_REF" && GIT_NOTES_REF="refs/notes/commits"
  13
  14 COMMIT=$(git rev-parse --verify --default HEAD "$@") ||
  15 die "Invalid commit: $@"
  16
  17 case "$ACTION" in
  18 edit)
  19         if [ "${GIT_NOTES_REF#refs/notes/}" = "$GIT_NOTES_REF" ]; then
  20                 die "Refusing to edit notes in $GIT_NOTES_REF (outside of refs/notes/)"
  21         fi
  22
  23         MSG_FILE="$GIT_DIR/new-notes-$COMMIT"
  24         GIT_INDEX_FILE="$MSG_FILE.idx"
  25         export GIT_INDEX_FILE
  26
  27         trap '
  28                 test -f "$MSG_FILE" && rm "$MSG_FILE"
  29                 test -f "$GIT_INDEX_FILE" && rm "$GIT_INDEX_FILE"
  30         ' 0
  31
  32         GIT_NOTES_REF= git log -1 $COMMIT | sed "s/^/#/" > "$MSG_FILE"
  33
  34         CURRENT_HEAD=$(git show-ref "$GIT_NOTES_REF" | cut -f 1 -d ' ')
  35         if [ -z "$CURRENT_HEAD" ]; then
  36                 PARENT=
  37         else
  38                 PARENT="-p $CURRENT_HEAD"
  39                 git read-tree "$GIT_NOTES_REF" || die "Could not read index"
  40                 git cat-file blob :$COMMIT >> "$MSG_FILE" 2> /dev/null
  41         fi
  42
  43         core_editor="$(git config core.editor)"
  44         ${GIT_EDITOR:-${core_editor:-${VISUAL:-${EDITOR:-vi}}}} "$MSG_FILE"
  45
  46         grep -v ^# < "$MSG_FILE" | git stripspace > "$MSG_FILE".processed
  47         mv "$MSG_FILE".processed "$MSG_FILE"
  48         if [ -s "$MSG_FILE" ]; then
  49                 BLOB=$(git hash-object -w "$MSG_FILE") ||
  50                         die "Could not write into object database"
  51                 git update-index --add --cacheinfo 0644 $BLOB $COMMIT ||
  52                         die "Could not write index"
  53         else
  54                 test -z "$CURRENT_HEAD" &&
  55                         die "Will not initialise with empty tree"
  56                 git update-index --force-remove $COMMIT ||
  57                         die "Could not update index"
  58         fi
  59
  60         TREE=$(git write-tree) || die "Could not write tree"
  61         NEW_HEAD=$(echo Annotate $COMMIT | git commit-tree $TREE $PARENT) ||
  62                 die "Could not annotate"
  63         git update-ref -m "Annotate $COMMIT" \
  64                 "$GIT_NOTES_REF" $NEW_HEAD $CURRENT_HEAD
  65 ;;
  66 show)
  67         git rev-parse -q --verify "$GIT_NOTES_REF":$COMMIT > /dev/null ||
  68                 die "No note for commit $COMMIT."
  69         git show "$GIT_NOTES_REF":$COMMIT
  70 ;;
  71 *)
  72         usage
  73 esac