merge-recursive: track information associated with directory renames

Directory rename detection previously silently applied.  In order to
allow printing information about paths that changed or printing a
conflict notification (and only doing so near other potential conflict
messages associated with the paths), save this information inside the
rename struct for later use.  A subsequent patch will make use of the
additional information.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/merge-recursive.c b/merge-recursive.c
index 1d2c9e1772c39a87ee342fc37497323741ee6861..938a526b20b1ba557cf9f40df56d9e9cad713247 100644 (file)
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -207,8 +207,16 @@ struct stage_data {
 };
 
 struct rename {
+       unsigned processed:1;
        struct diff_filepair *pair;
        const char *branch; /* branch that the rename occurred on */
+       /*
+        * If directory rename detection affected this rename, what was its
+        * original type ('A' or 'R') and it's original destination before
+        * the directory rename (otherwise, '\0' and NULL for these two vars).
+        */
+       char dir_rename_original_type;
+       char *dir_rename_original_dest;
        /*
         * Purpose of src_entry and dst_entry:
         *
@@ -230,8 +238,6 @@ struct rename {
         */
        struct stage_data *src_entry;
        struct stage_data *dst_entry;
-       unsigned add_turned_into_rename:1;
-       unsigned processed:1;
 };
 
 struct rename_conflict_info {
@@ -2484,16 +2490,18 @@ static void apply_directory_rename_modifications(struct merge_options *opt,
                       &re->dst_entry->stages[stage].oid,
                       &re->dst_entry->stages[stage].mode);
 
-       /* Update pair status */
-       if (pair->status == 'A') {
-               /*
-                * Recording rename information for this add makes it look
-                * like a rename/delete conflict.  Make sure we can
-                * correctly handle this as an add that was moved to a new
-                * directory instead of reporting a rename/delete conflict.
-                */
-               re->add_turned_into_rename = 1;
-       }
+       /*
+        * Record the original change status (or 'type' of change).  If it
+        * was originally an add ('A'), this lets us differentiate later
+        * between a RENAME_DELETE conflict and RENAME_VIA_DIR (they
+        * otherwise look the same).  If it was originally a rename ('R'),
+        * this lets us remember and report accurately about the transitive
+        * renaming that occurred via the directory rename detection.  Also,
+        * record the original destination name.
+        */
+       re->dir_rename_original_type = pair->status;
+       re->dir_rename_original_dest = pair->two->path;
+
        /*
         * We don't actually look at pair->status again, but it seems
         * pedagogically correct to adjust it.
@@ -2556,9 +2564,10 @@ static struct string_list *get_renames(struct merge_options *opt,
 
                re = xmalloc(sizeof(*re));
                re->processed = 0;
-               re->add_turned_into_rename = 0;
                re->pair = pair;
                re->branch = branch;
+               re->dir_rename_original_type = '\0';
+               re->dir_rename_original_dest = NULL;
                item = string_list_lookup(entries, re->pair->one->path);
                if (!item)
                        re->src_entry = insert_stage_data(re->pair->one->path,
@@ -2726,7 +2735,7 @@ static int process_renames(struct merge_options *opt,
                        try_merge = 0;
 
                        if (oid_eq(&src_other.oid, &null_oid) &&
-                           ren1->add_turned_into_rename) {
+                           ren1->dir_rename_original_type == 'A') {
                                setup_rename_conflict_info(RENAME_VIA_DIR,
                                                           opt, ren1, NULL);
                        } else if (oid_eq(&src_other.oid, &null_oid)) {