[PATCH v2 2/4] add--helper: create builtin helper for interactive add

[Daniel Ferreira <bnmvco@gmail.com>]

Create a builtin helper for git-add--interactive, which right now is not
able to do anything.

This is the first step in an effort to convert git-add--interactive.perl
to a C builtin, in search for better portability, expressibility and
performance (specially on non-POSIX systems like Windows).

Additionally, an eventual complete port of git-add--interactive would
remove the last "big" Git script to have Perl as a dependency, allowing
most Git users to have a NOPERL build running without big losses.

Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
---
 .gitignore            | 1 +
 Makefile              | 1 +
 builtin.h             | 1 +
 builtin/add--helper.c | 6 ++++++
 git.c                 | 1 +
 5 files changed, 10 insertions(+)
 create mode 100644 builtin/add--helper.c

diff --git a/.gitignore b/.gitignore
index 833ef3b..11cec05 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,6 +11,7 @@
 /git
 /git-add
 /git-add--interactive
+/git-add--helper
 /git-am
 /git-annotate
 /git-apply
diff --git a/Makefile b/Makefile
index e35542e..b7f49b6 100644
--- a/Makefile
+++ b/Makefile
@@ -873,6 +873,7 @@ LIB_OBJS += xdiff-interface.o
 LIB_OBJS += zlib.o
 
 BUILTIN_OBJS += builtin/add.o
+BUILTIN_OBJS += builtin/add--helper.o
 BUILTIN_OBJS += builtin/am.o
 BUILTIN_OBJS += builtin/annotate.o
 BUILTIN_OBJS += builtin/apply.o
diff --git a/builtin.h b/builtin.h
index 9e4a898..85b4c55 100644
--- a/builtin.h
+++ b/builtin.h
@@ -30,6 +30,7 @@ extern int textconv_object(const char *path, unsigned mode, const struct object_
 extern int is_builtin(const char *s);
 
 extern int cmd_add(int argc, const char **argv, const char *prefix);
+extern int cmd_add__helper(int argc, const char **argv, const char *prefix);
 extern int cmd_am(int argc, const char **argv, const char *prefix);
 extern int cmd_annotate(int argc, const char **argv, const char *prefix);
 extern int cmd_apply(int argc, const char **argv, const char *prefix);
diff --git a/builtin/add--helper.c b/builtin/add--helper.c
new file mode 100644
index 0000000..6a97f0e
--- /dev/null
+++ b/builtin/add--helper.c
@@ -0,0 +1,6 @@
+#include "builtin.h"
+
+int cmd_add__helper(int argc, const char **argv, const char *prefix)
+{
+	return 0;
+}
diff --git a/git.c b/git.c
index 8ff44f0..47ee257 100644
--- a/git.c
+++ b/git.c
@@ -391,6 +391,7 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 
 static struct cmd_struct commands[] = {
 	{ "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
+	{ "add--helper", cmd_add__helper, RUN_SETUP | NEED_WORK_TREE },
 	{ "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
 	{ "annotate", cmd_annotate, RUN_SETUP },
 	{ "apply", cmd_apply, RUN_SETUP_GENTLY },
-- 
2.7.4 (Apple Git-66)