Extract the body of the for loop in treat_gitlinks() into a separate
treat_gitlink() function so that it can be reused elsewhere.  This
paves the way for a new check-ignore sub-command.

Signed-off-by: Adam Spiers <g...@adamspiers.org>
---
 builtin/add.c | 50 ++++++++++++++++++++++++++++++++------------------
 1 file changed, 32 insertions(+), 18 deletions(-)

diff --git a/builtin/add.c b/builtin/add.c
index c689f37..856d232 100644
--- a/builtin/add.c
+++ b/builtin/add.c
@@ -153,31 +153,45 @@ static char *prune_directory(struct dir_struct *dir, 
const char **pathspec, int
        return seen;
 }
 
-static void treat_gitlinks(const char **pathspec)
+/*
+ * Check whether path refers to a submodule, or something inside a
+ * submodule.  If the former, returns the path with any trailing slash
+ * stripped.  If the latter, dies with an error message.
+ */
+const char *treat_gitlink(const char *path)
 {
-       int i;
-
-       if (!pathspec || !*pathspec)
-               return;
-
+       int i, path_len = strlen(path);
        for (i = 0; i < active_nr; i++) {
                struct cache_entry *ce = active_cache[i];
                if (S_ISGITLINK(ce->ce_mode)) {
-                       int len = ce_namelen(ce), j;
-                       for (j = 0; pathspec[j]; j++) {
-                               int len2 = strlen(pathspec[j]);
-                               if (len2 <= len || pathspec[j][len] != '/' ||
-                                   memcmp(ce->name, pathspec[j], len))
-                                       continue;
-                               if (len2 == len + 1)
-                                       /* strip trailing slash */
-                                       pathspec[j] = xstrndup(ce->name, len);
-                               else
-                                       die (_("Path '%s' is in submodule 
'%.*s'"),
-                                               pathspec[j], len, ce->name);
+                       int ce_len = ce_namelen(ce);
+                       if (path_len <= ce_len || path[ce_len] != '/' ||
+                           memcmp(ce->name, path, ce_len))
+                               /* path does not refer to this
+                                * submodule or anything inside it */
+                               continue;
+                       if (path_len == ce_len + 1) {
+                               /* path refers to submodule;
+                                * strip trailing slash */
+                               return xstrndup(ce->name, ce_len);
+                       } else {
+                               die (_("Path '%s' is in submodule '%.*s'"),
+                                    path, ce_len, ce->name);
                        }
                }
        }
+       return path;
+}
+
+void treat_gitlinks(const char **pathspec)
+{
+       int i;
+
+       if (!pathspec || !*pathspec)
+               return;
+
+       for (i = 0; pathspec[i]; i++)
+               pathspec[i] = treat_gitlink(pathspec[i]);
 }
 
 static void refresh(int verbose, const char **pathspec)
-- 
1.7.11.2.249.g31c7954

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