[PATCH 3/7] Introduce entry point for launching add--interactive.

["Kristian Høgsberg" <krh@redhat.com>]

This refactors builtin-add.c a little to provide a unique entry point
for launching git add --interactive, which will be used by
builtin-commit too.  If we later want to make add --interactive a
builtin or change how it is launched, we just start from this function.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
---
 builtin-add.c |   15 ++++++++++-----
 commit.h      |    3 +++
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/builtin-add.c b/builtin-add.c
index 0d7d0ce..a5cb910 100644
--- a/builtin-add.c
+++ b/builtin-add.c
@@ -12,6 +12,7 @@
 #include "diffcore.h"
 #include "commit.h"
 #include "revision.h"
+#include "run-command.h"
 
 static const char builtin_add_usage[] =
 "git-add [-n] [-v] [-f] [--interactive | -i] [-u] [--refresh] [--] <filepattern>...";
@@ -153,6 +154,13 @@ static int git_add_config(const char *var, const char *value)
 	return git_default_config(var, value);
 }
 
+int interactive_add(void)
+{
+	const char *argv[2] = { "add--interactive", NULL };
+
+	return run_command_v_opt(argv, RUN_GIT_CMD);
+}
+
 static struct lock_file lock_file;
 
 static const char ignore_error[] =
@@ -172,12 +180,9 @@ int cmd_add(int argc, const char **argv, const char *prefix)
 			add_interactive++;
 	}
 	if (add_interactive) {
-		const char *args[] = { "add--interactive", NULL };
-
-		if (add_interactive != 1 || argc != 2)
+		if (argc != 2)
 			die("add --interactive does not take any parameters");
-		execv_git_cmd(args);
-		exit(1);
+		exit(interactive_add());
 	}
 
 	git_config(git_add_config);
diff --git a/commit.h b/commit.h
index b779de8..da34c23 100644
--- a/commit.h
+++ b/commit.h
@@ -128,4 +128,7 @@ extern struct commit_list *get_shallow_commits(struct object_array *heads,
 		int depth, int shallow_flag, int not_shallow_flag);
 
 int in_merge_bases(struct commit *, struct commit **, int);
+
+extern int interactive_add(void);
+
 #endif /* COMMIT_H */
-- 
1.5.3.1.993.gbf388-dirty