mergetool: Provide an empty file when needed

diff --git a/builtin/add.c b/builtin/add.c
index 944e5a8cc9f4741c01cdca2911212d462faadcd3..c59b0c98fefefc413c8330715fffcc83142d5b2d 100644 (file)
--- a/builtin/add.c
+++ b/builtin/add.c
@@ -26,6 +26,27 @@ struct update_callback_data {
        int add_errors;
 };
 
+static int fix_unmerged_status(struct diff_filepair *p,
+                              struct update_callback_data *data)
+{
+       if (p->status != DIFF_STATUS_UNMERGED)
+               return p->status;
+       if (!(data->flags & ADD_CACHE_IGNORE_REMOVAL) && !p->two->mode)
+               /*
+                * This is not an explicit add request, and the
+                * path is missing from the working tree (deleted)
+                */
+               return DIFF_STATUS_DELETED;
+       else
+               /*
+                * Either an explicit add request, or path exists
+                * in the working tree.  An attempt to explicitly
+                * add a path that does not exist in the working tree
+                * will be caught as an error by the caller immediately.
+                */
+               return DIFF_STATUS_MODIFIED;
+}
+
 static void update_callback(struct diff_queue_struct *q,
                            struct diff_options *opt, void *cbdata)
 {
@@ -35,30 +56,9 @@ static void update_callback(struct diff_queue_struct *q,
        for (i = 0; i < q->nr; i++) {
                struct diff_filepair *p = q->queue[i];
                const char *path = p->one->path;
-               switch (p->status) {
+               switch (fix_unmerged_status(p, data)) {
                default:
                        die(_("unexpected diff status %c"), p->status);
-               case DIFF_STATUS_UNMERGED:
-                       /*
-                        * ADD_CACHE_IGNORE_REMOVAL is unset if "git
-                        * add -u" is calling us, In such a case, a
-                        * missing work tree file needs to be removed
-                        * if there is an unmerged entry at stage #2,
-                        * but such a diff record is followed by
-                        * another with DIFF_STATUS_DELETED (and if
-                        * there is no stage #2, we won't see DELETED
-                        * nor MODIFIED).  We can simply continue
-                        * either way.
-                        */
-                       if (!(data->flags & ADD_CACHE_IGNORE_REMOVAL))
-                               continue;
-                       /*
-                        * Otherwise, it is "git add path" is asking
-                        * to explicitly add it; we fall through.  A
-                        * missing work tree file is an error and is
-                        * caught by add_file_to_index() in such a
-                        * case.
-                        */
                case DIFF_STATUS_MODIFIED:
                case DIFF_STATUS_TYPE_CHANGED:
                        if (add_file_to_index(&the_index, path, data->flags)) {
@@ -91,6 +91,7 @@ int add_files_to_cache(const char *prefix, const char **pathspec, int flags)
        data.flags = flags;
        data.add_errors = 0;
        rev.diffopt.format_callback_data = &data;
+       rev.max_count = 0; /* do not compare unmerged paths with stage #2 */
        run_diff_files(&rev, DIFF_RACY_IS_MODIFIED);
        return !!data.add_errors;
 }
@@ -241,7 +242,7 @@ int run_add_interactive(const char *revision, const char *patch_mode,
        return status;
 }
 
-int interactive_add(int argc, const char **argv, const char *prefix)
+int interactive_add(int argc, const char **argv, const char *prefix, int patch)
 {
        const char **pathspec = NULL;
 
@@ -252,7 +253,7 @@ int interactive_add(int argc, const char **argv, const char *prefix)
        }
 
        return run_add_interactive(NULL,
-                                  patch_interactive ? "--patch" : NULL,
+                                  patch ? "--patch" : NULL,
                                   pathspec);
 }
 
@@ -377,7 +378,7 @@ int cmd_add(int argc, const char **argv, const char *prefix)
        if (patch_interactive)
                add_interactive = 1;
        if (add_interactive)
-               exit(interactive_add(argc - 1, argv + 1, prefix));
+               exit(interactive_add(argc - 1, argv + 1, prefix, patch_interactive));
 
        if (edit_interactive)
                return(edit_patch(argc, argv, prefix));