Add "commit" helper script

This is meant to make raw git not hugely less usable than something
like raw CVS. I want to make a 1.0 release of the plumbing, and the
actual commit part was just too intimidating.

Makefile

@@ -22,7 +22,7 @@ INSTALL=install
 
 SCRIPTS=git-apply-patch-script git-merge-one-file-script git-prune-script \
 	git-pull-script git-tag-script git-resolve-script git-whatchanged \
-	git-deltafy-script git-fetch-script
+	git-deltafy-script git-fetch-script git-status-script git-commit-script
 
 PROG=   git-update-cache git-diff-files git-init-db git-write-tree \
 	git-read-tree git-commit-tree git-cat-file git-fsck-cache \
@@ -31,7 +31,7 @@ PROG=   git-update-cache git-diff-files git-init-db git-write-tree \
 	git-unpack-file git-export git-diff-cache git-convert-cache \
 	git-http-pull git-rpush git-rpull git-rev-list git-mktag \
 	git-diff-helper git-tar-tree git-local-pull git-write-blob \
-	git-get-tar-commit-id git-mkdelta git-apply
+	git-get-tar-commit-id git-mkdelta git-apply git-stripspace
 
 all: $(PROG)
 
@@ -112,6 +112,7 @@ git-diff-helper: diff-helper.c
 git-tar-tree: tar-tree.c
 git-write-blob: write-blob.c
 git-mkdelta: mkdelta.c
+git-stripspace: stripspace.c
 
 git-http-pull: LIBS += -lcurl
 

git-commit-script

@@ -0,0 +1,15 @@
+#!/bin/sh
+git-status-script > .editmsg
+if [ "$?" != "0" ]
+then
+	cat .editmsg
+	exit 1
+fi
+ED=${VISUAL:$EDITOR}
+ED=${ED:vi}
+$ED .editmsg
+grep -v '^#' < .editmsg | git-stripspace > .cmitmsg
+[ -s .cmitmsg ] || exit 1
+tree=$(git-write-tree) || exit 1
+commit=$(cat .cmitmsg | git-commit-tree $tree -p HEAD) || exit 1
+echo $commit > .git/HEAD

git-status-script

@@ -0,0 +1,38 @@
+#!/bin/sh
+report () {
+  header="#
+# $1:
+#   ($2)
+#
+"
+  trailer=""
+  while read oldmode mode oldsha sha status name newname
+  do
+    echo -n "$header"
+    header=""
+    trailer="#
+"
+    case "$status" in
+    M) echo "#	modified: $name";;
+    D) echo "#	deleted:  $name";;
+    T) echo "#	typechange: $name";;
+    C) echo "#	copied: $name -> $newname";;
+    R) echo "#	renamed: $name -> $newname";;
+    N) echo "#	new file: $name";;
+    U) echo "#	unmerged: $name";;
+    esac
+  done
+  echo -n "$trailer"
+  [ "$header" ]
+}
+
+git-update-cache --refresh >& /dev/null
+git-diff-cache -B -C --cached HEAD | sed 's/^://' | report "Updated but not checked in" "will commit"
+committable="$?"
+git-diff-files | sed 's/^://' | report "Changed but not updated" "use git-update-cache to mark for commit"
+if [ "$committable" == "0" ]
+then
+	echo "nothing to commit"
+	exit 1
+fi
+exit 0

stripspace.c

@@ -0,0 +1,48 @@
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+
+/*
+ * Remove empty lines from the beginning and end.
+ *
+ * Turn multiple consecutive empty lines into just one
+ * empty line.
+ */
+static void cleanup(char *line)
+{
+	int len = strlen(line);
+
+	if (len > 1 && line[len-1] == '\n') {
+		do {
+			unsigned char c = line[len-2];
+			if (!isspace(c))
+				break;
+			line[len-2] = '\n';
+			len--;
+			line[len] = 0;
+		} while (len > 1);
+	}
+}
+
+int main(int argc, char **argv)
+{
+	int empties = -1;
+	char line[1024];
+
+	while (fgets(line, sizeof(line), stdin)) {
+		cleanup(line);
+
+		/* Not just an empty line? */
+		if (line[0] != '\n') {
+			if (empties > 0)
+				putchar('\n');
+			empties = 0;
+			fputs(line, stdout);
+			continue;
+		}
+		if (empties < 0)
+			continue;
+		empties++;
+	}
+	return 0;
+}