git-format-patch: --stdout option.

This new flag generates the mbox formatted output to the standard
output, instead of saving them into a file per patch and implies --mbox.

It also fixes a corner case where the commit does not have *any* message.

Signed-off-by: Junio C Hamano <junkio@cox.net>

git-format-patch.sh

@@ -6,7 +6,7 @@
 . git-sh-setup || die "Not a git archive."
 
 usage () {
-    echo >&2 "usage: $0"' [-n] [-o dir] [--keep-subject] [--mbox] [--check] [--signoff] [-<diff options>...] upstream [ our-head ]
+    echo >&2 "usage: $0"' [-n] [-o dir | --stdout] [--keep-subject] [--mbox] [--check] [--signoff] [-<diff options>...] upstream [ our-head ]
 
 Prepare each commit with its patch since our-head forked from upstream,
 one file per patch, for e-mail submission.  Each output file is
@@ -49,6 +49,8 @@ do
     numbered=t ;;
     -s|--s|--si|--sig|--sign|--signo|--signof|--signoff)
     signoff=t ;;
+    --st|--std|--stdo|--stdou|--stdout)
+    stdout=t mbox=t date=t author=t ;;
     -o=*|--o=*|--ou=*|--out=*|--outp=*|--outpu=*|--output=*|--output-=*|\
     --output-d=*|--output-di=*|--output-dir=*|--output-dire=*|\
     --output-direc=*|--output-direct=*|--output-directo=*|\
@@ -141,25 +143,7 @@ do
 	esac
 done >$series
 
-total=`wc -l <$series | tr -dc "[0-9]"`
-i=1
-while read commit
-do
-    git-cat-file commit "$commit" | git-stripspace >$commsg
-    title=`sed -ne "$titleScript" <$commsg`
-    case "$numbered" in
-    '') num= ;;
-    *)
-	case $total in
-	1) num= ;;
-	*) num=' '`printf "%d/%d" $i $total` ;;
-	esac
-    esac
-
-    file=`printf '%04d-%stxt' $i "$title"`
-    i=`expr "$i" + 1`
-    echo "* $file"
-    {
+process_one () {
 	mailScript='
 	/./d
 	/^$/n'
@@ -178,6 +162,7 @@ do
 	    echo 'From nobody Mon Sep 17 00:00:00 2001' ;# UNIX "From" line
 	    ;;
 	esac
+
 	eval "$(sed -ne "$whosepatchScript" $commsg)"
 	test "$author,$au" = ",$me" || {
 		mailScript="$mailScript"'
@@ -196,7 +181,9 @@ Date: '"$ad"
 	n
 	b body'
 
-	sed -ne "$mailScript" <$commsg
+	(cat $commsg ; echo; echo) |
+	sed -ne "$mailScript" |
+	git-stripspace
 
 	test "$signoff" = "t" && {
 		offsigner=`git-var GIT_COMMITTER_IDENT | sed -e 's/>.*/>/'`
@@ -222,14 +209,39 @@ Date: '"$ad"
 		echo
 		;;
 	esac
-    } >"$outdir$file"
-    case "$check" in
-    t)
+}
+
+total=`wc -l <$series | tr -dc "[0-9]"`
+i=1
+while read commit
+do
+    git-cat-file commit "$commit" | git-stripspace >$commsg
+    title=`sed -ne "$titleScript" <$commsg`
+    case "$numbered" in
+    '') num= ;;
+    *)
+	case $total in
+	1) num= ;;
+	*) num=' '`printf "%d/%d" $i $total` ;;
+	esac
+    esac
+
+    file=`printf '%04d-%stxt' $i "$title"`
+    if test '' = "$stdout"
+    then
+	    echo "* $file"
+	    process_one >"$outdir$file"
+	    if test t = "$check"
+	    then
 		# This is slightly modified from Andrew Morton's Perfect Patch.
 		# Lines you introduce should not have trailing whitespace.
 		# Also check for an indentation that has SP before a TAB.
 		grep -n '^+\([ 	]* 	.*\|.*[ 	]\)$' "$outdir$file"
-
-	: do not exit with non-zero because we saw no problem in the last one.
-    esac
+		:
+	    fi
+    else
+	    echo >&2 "* $file"
+	    process_one
+    fi
+    i=`expr "$i" + 1`
 done <$series