From: Elijah Newren <newren@xxxxxxxxx>
This function roughly follows the same outline as the function of the
same name from merge-recursive.c, but the code diverges in multiple
ways due to some special considerations:
* merge-ort's version needs to update opt->priv->paths with any new
paths (and opt->priv->paths points to struct conflict_infos which
track quite a bit of metadata for each path); merge-recursive's
version would directly update the index
* merge-ort requires that opt->priv->paths has any leading directories
of any relevant files also be included in the set of paths. And
due to pointer equality requirements on merged_info.directory_name,
we have to be careful how we compute and insert these.
* due to the above requirements on opt->priv->paths, merge-ort's
version starts with a long comment to explain all the special
considerations that need to be handled
* merge-ort can use the full data stored in opt->priv->paths to avoid
making expensive get_tree_entry() calls to regather the necessary
data.
* due to messages being deferred automatically in merge-ort, this is
the best place to handle conflict messages whereas in
merge-recursive.c they are deferred manually so that processing of
entries does all the printing
Signed-off-by: Elijah Newren <newren@xxxxxxxxx>
---
merge-ort.c | 168 +++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 167 insertions(+), 1 deletion(-)
diff --git a/merge-ort.c b/merge-ort.c
index 5b3b56dc1cd..1152d0ae21e 100644
--- a/merge-ort.c
+++ b/merge-ort.c
@@ -1223,7 +1223,173 @@ static void apply_directory_rename_modifications(struct merge_options *opt,
struct diff_filepair *pair,
char *new_path)
{
- die("Not yet implemented.");
+ /*
+ * The basic idea is to get the conflict_info from opt->priv->paths
+ * at old path, and insert it into new_path; basically just this:
+ * ci = strmap_get(&opt->priv->paths, old_path);
+ * strmap_remove(&opt->priv->paths, old_path, 0);
+ * strmap_put(&opt->priv->paths, new_path, ci);
+ * However, there are some factors complicating this:
+ * - opt->priv->paths may already have an entry at new_path
+ * - Each ci tracks its containing directory, so we need to
+ * update that
+ * - If another ci has the same containing directory, then
+ * the two char*'s MUST point to the same location. See the
+ * comment in struct merged_info. strcmp equality is not
+ * enough; we need pointer equality.
+ * - opt->priv->paths must hold the parent directories of any
+ * entries that are added. So, if this directory rename
+ * causes entirely new directories, we must recursively add
+ * parent directories.
+ * - For each parent directory added to opt->priv->paths, we
+ * also need to get its parent directory stored in its
+ * conflict_info->merged.directory_name with all the same
+ * requirements about pointer equality.
+ */
+ struct string_list dirs_to_insert = STRING_LIST_INIT_NODUP;
+ struct conflict_info *ci, *new_ci;
+ struct strmap_entry *entry;
+ const char *branch_with_new_path, *branch_with_dir_rename;
+ const char *old_path = pair->two->path;
+ const char *parent_name;
+ const char *cur_path;
+ int i, len;
+
+ entry = strmap_get_entry(&opt->priv->paths, old_path);
+ old_path = entry->key;
+ ci = entry->value;
+ VERIFY_CI(ci);
+
+ /* Find parent directories missing from opt->priv->paths */
+ cur_path = new_path;
+ while (1) {
+ /* Find the parent directory of cur_path */
+ char *last_slash = strrchr(cur_path, '/');
+ if (last_slash) {
+ parent_name = xstrndup(cur_path, last_slash - cur_path);
+ } else {
+ parent_name = opt->priv->toplevel_dir;
+ break;
+ }
+
+ /* Look it up in opt->priv->paths */
+ entry = strmap_get_entry(&opt->priv->paths, parent_name);
+ if (entry) {
+ free((char*)parent_name);
+ parent_name = entry->key; /* reuse known pointer */
+ break;
+ }
+
+ /* Record this is one of the directories we need to insert */
+ string_list_append(&dirs_to_insert, parent_name);
+ cur_path = parent_name;
+ }
+
+ /* Traverse dirs_to_insert and insert them into opt->priv->paths */
+ for (i = dirs_to_insert.nr-1; i >= 0; --i) {
+ struct conflict_info *dir_ci;
+ char *cur_dir = dirs_to_insert.items[i].string;
+
+ dir_ci = xcalloc(1, sizeof(*dir_ci));
+
+ dir_ci->merged.directory_name = parent_name;
+ len = strlen(parent_name);
+ /* len+1 because of trailing '/' character */
+ dir_ci->merged.basename_offset = (len > 0 ? len+1 : len);
+ dir_ci->dirmask = ci->filemask;
+ strmap_put(&opt->priv->paths, cur_dir, dir_ci);
+
+ parent_name = cur_dir;
+ }
+
+ /*
+ * We are removing old_path from opt->priv->paths. old_path also will
+ * eventually need to be freed, but it may still be used by e.g.
+ * ci->pathnames. So, store it in another string-list for now.
+ */
+ string_list_append(&opt->priv->paths_to_free, old_path);
+
+ assert(ci->filemask == 2 || ci->filemask == 4);
+ assert(ci->dirmask == 0);
+ strmap_remove(&opt->priv->paths, old_path, 0);
+
+ branch_with_new_path = (ci->filemask == 2) ? opt->branch1 : opt->branch2;
+ branch_with_dir_rename = (ci->filemask == 2) ? opt->branch2 : opt->branch1;
+
+ /* Now, finally update ci and stick it into opt->priv->paths */
+ ci->merged.directory_name = parent_name;
+ len = strlen(parent_name);
+ ci->merged.basename_offset = (len > 0 ? len+1 : len);
+ new_ci = strmap_get(&opt->priv->paths, new_path);
+ if (!new_ci) {
+ /* Place ci back into opt->priv->paths, but at new_path */
+ strmap_put(&opt->priv->paths, new_path, ci);
+ } else {
+ int index;
+
+ /* A few sanity checks */
+ VERIFY_CI(new_ci);
+ assert(ci->filemask == 2 || ci->filemask == 4);
+ assert((new_ci->filemask & ci->filemask) == 0);
+ assert(!new_ci->merged.clean);
+
+ /* Copy stuff from ci into new_ci */
+ new_ci->filemask |= ci->filemask;
+ if (new_ci->dirmask)
+ new_ci->df_conflict = 1;
+ index = (ci->filemask >> 1);
+ new_ci->pathnames[index] = ci->pathnames[index];
+ new_ci->stages[index].mode = ci->stages[index].mode;
+ oidcpy(&new_ci->stages[index].oid, &ci->stages[index].oid);
+
+ free(ci);
+ ci = new_ci;
+ }
+
+ if (opt->detect_directory_renames == MERGE_DIRECTORY_RENAMES_TRUE) {
+ /* Notify user of updated path */
+ if (pair->status == 'A')
+ path_msg(opt, new_path, 1,
+ _("Path updated: %s added in %s inside a "
+ "directory that was renamed in %s; moving "
+ "it to %s."),
+ old_path, branch_with_new_path,
+ branch_with_dir_rename, new_path);
+ else
+ path_msg(opt, new_path, 1,
+ _("Path updated: %s renamed to %s in %s, "
+ "inside a directory that was renamed in %s; "
+ "moving it to %s."),
+ pair->one->path, old_path, branch_with_new_path,
+ branch_with_dir_rename, new_path);
+ } else {
+ /*
+ * opt->detect_directory_renames has the value
+ * MERGE_DIRECTORY_RENAMES_CONFLICT, so mark these as conflicts.
+ */
+ ci->path_conflict = 1;
+ if (pair->status == 'A')
+ path_msg(opt, new_path, 0,
+ _("CONFLICT (file location): %s added in %s "
+ "inside a directory that was renamed in %s, "
+ "suggesting it should perhaps be moved to "
+ "%s."),
+ old_path, branch_with_new_path,
+ branch_with_dir_rename, new_path);
+ else
+ path_msg(opt, new_path, 0,
+ _("CONFLICT (file location): %s renamed to %s "
+ "in %s, inside a directory that was renamed "
+ "in %s, suggesting it should perhaps be "
+ "moved to %s."),
+ pair->one->path, old_path, branch_with_new_path,
+ branch_with_dir_rename, new_path);
+ }
+
+ /*
+ * Finally, record the new location.
+ */
+ pair->two->path = new_path;
}
/*** Function Grouping: functions related to regular rename detection ***/
--
gitgitgadget
