git-am foreign patch support: introduce patch_format

Set up a framework to allow git-am to support patches which are not in
mailbox format. Introduce a patch_format variable that presently can
only be set from the command line, defaulting to 'mbox' (the only
supported format) if not specified.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-am.sh b/git-am.sh
index 578780be138b216dc89333e1fde87ddcb91e5e54..da160de3c33404dc4ebe81714af61a2d45ea8ad6 100755 (executable)
--- a/git-am.sh
+++ b/git-am.sh
@@ -18,6 +18,7 @@ whitespace=     pass it through git-apply
 directory=      pass it through git-apply
 C=              pass it through git-apply
 p=              pass it through git-apply
+patch-format=   format the patch(es) are in
 reject          pass it through git-apply
 resolvemsg=     override error message when patch failure occurs
 r,resolved      to be used after a patch failure
@@ -133,6 +134,32 @@ It does not apply to blobs recorded in its index."
     unset GITHEAD_$his_tree
 }
 
+patch_format=
+
+check_patch_format () {
+       # early return if patch_format was set from the command line
+       if test -n "$patch_format"
+       then
+               return 0
+       fi
+       patch_format=mbox
+}
+
+split_patches () {
+       case "$patch_format" in
+       mbox)
+               git mailsplit -d"$prec" -o"$dotest" -b -- "$@" > "$dotest/last" ||  {
+                       rm -fr "$dotest"
+                       exit 1
+               }
+               ;;
+       *)
+               echo "Patch format $patch_format is not supported."
+               exit 1
+               ;;
+       esac
+}
+
 prec=4
 dotest="$GIT_DIR/rebase-apply"
 sign= utf8=t keep= skip= interactive= resolved= rebasing= abort=
@@ -175,6 +202,8 @@ do
                git_apply_opt="$git_apply_opt $(sq "$1=$2")"; shift ;;
        -C|-p)
                git_apply_opt="$git_apply_opt $(sq "$1$2")"; shift ;;
+       --patch-format)
+               shift ; patch_format="$1" ;;
        --reject)
                git_apply_opt="$git_apply_opt $1" ;;
        --committer-date-is-author-date)
@@ -274,10 +303,10 @@ else
                done
                shift
        fi
-       git mailsplit -d"$prec" -o"$dotest" -b -- "$@" > "$dotest/last" ||  {
-               rm -fr "$dotest"
-               exit 1
-       }
+
+       check_patch_format "$@"
+
+       split_patches "$@"
 
        # -s, -u, -k, --whitespace, -3, -C and -p flags are kept
        # for the resuming session after a patch failure.