[PATCH] port --ignore-unmatch to "git add"

[Luke Dashjr <luke-jr+git@utopios.org>]

"git rm" has a --ignore-unmatch option that is also applicable to "git add"
and may be useful for persons wanting to ignore unmatched arguments, but not
all errors.

Signed-off-by: Luke Dashjr <luke-jr+git@utopios.org>
---
 builtin-add.c |   27 +++++++++++++++++++--------
 1 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/builtin-add.c b/builtin-add.c
index 581a2a1..3882482 100644
--- a/builtin-add.c
+++ b/builtin-add.c
@@ -19,6 +19,7 @@ static const char * const builtin_add_usage[] = {
 };
 static int patch_interactive, add_interactive, edit_interactive;
 static int take_worktree_changes;
+static int ignore_unmatch = 0;
 
 static void fill_pathspec_matches(const char **pathspec, char *seen, int specs)
 {
@@ -60,13 +61,18 @@ static void prune_directory(struct dir_struct *dir, const char **pathspec, int p
 			*dst++ = entry;
 	}
 	dir->nr = dst - dir->entries;
-	fill_pathspec_matches(pathspec, seen, specs);
 
-	for (i = 0; i < specs; i++) {
-		if (!seen[i] && pathspec[i][0] && !file_exists(pathspec[i]))
-			die("pathspec '%s' did not match any files",
-					pathspec[i]);
+	if (!ignore_unmatch)
+	{
+		fill_pathspec_matches(pathspec, seen, specs);
+
+		for (i = 0; i < specs; i++) {
+			if (!seen[i] && pathspec[i][0] && !file_exists(pathspec[i]))
+				die("pathspec '%s' did not match any files",
+						pathspec[i]);
+		}
 	}
+
         free(seen);
 }
 
@@ -107,9 +113,12 @@ static void refresh(int verbose, const char **pathspec)
 	seen = xcalloc(specs, 1);
 	refresh_index(&the_index, verbose ? REFRESH_SAY_CHANGED : REFRESH_QUIET,
 		      pathspec, seen);
-	for (i = 0; i < specs; i++) {
-		if (!seen[i])
-			die("pathspec '%s' did not match any files", pathspec[i]);
+	if (!ignore_unmatch)
+	{
+		for (i = 0; i < specs; i++) {
+			if (!seen[i])
+				die("pathspec '%s' did not match any files", pathspec[i]);
+		}
 	}
         free(seen);
 }
@@ -226,6 +235,8 @@ static struct option builtin_add_options[] = {
 	OPT_BOOLEAN('A', "all", &addremove, "add all, noticing removal of tracked files"),
 	OPT_BOOLEAN( 0 , "refresh", &refresh_only, "don't add, only refresh the index"),
 	OPT_BOOLEAN( 0 , "ignore-errors", &ignore_add_errors, "just skip files which cannot be added because of errors"),
+	OPT_BOOLEAN( 0 , "ignore-unmatch", &ignore_unmatch,
+				"exit with a zero status even if nothing matched"),
 	OPT_END(),
 };
 
-- 
1.6.3.3