git@vger.kernel.org mailing list mirror (one of many)
 help / color / mirror / code / Atom feed
From: Elijah Newren <newren@gmail.com>
To: git@vger.kernel.org
Cc: sbeller@google.com, gitster@pobox.com, Elijah Newren <newren@gmail.com>
Subject: [PATCH v4 22/34] merge-recursive: add get_directory_renames()
Date: Tue, 28 Nov 2017 17:42:25 -0800	[thread overview]
Message-ID: <20171129014237.32570-23-newren@gmail.com> (raw)
In-Reply-To: <20171129014237.32570-1-newren@gmail.com>

This populates a list of directory renames for us.  The list of
directory renames is not yet used, but will be in subsequent commits.

Signed-off-by: Elijah Newren <newren@gmail.com>
---
 merge-recursive.c | 155 ++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 152 insertions(+), 3 deletions(-)

diff --git a/merge-recursive.c b/merge-recursive.c
index c5932d5c57..6aef357e78 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -1384,6 +1384,138 @@ static struct diff_queue_struct *get_diffpairs(struct merge_options *o,
 	return ret;
 }
 
+static void get_renamed_dir_portion(const char *old_path, const char *new_path,
+				    char **old_dir, char **new_dir)
+{
+	char *end_of_old, *end_of_new;
+	int old_len, new_len;
+
+	*old_dir = NULL;
+	*new_dir = NULL;
+
+	/* For
+	 *    "a/b/c/d/foo.c" -> "a/b/something-else/d/foo.c"
+	 * the "d/foo.c" part is the same, we just want to know that
+	 *    "a/b/c" was renamed to "a/b/something-else"
+	 * so, for this example, this function returns "a/b/c" in
+	 * *old_dir and "a/b/something-else" in *new_dir.
+	 *
+	 * Also, if the basename of the file changed, we don't care.  We
+	 * want to know which portion of the directory, if any, changed.
+	 */
+	end_of_old = strrchr(old_path, '/');
+	end_of_new = strrchr(new_path, '/');
+
+	if (end_of_old == NULL || end_of_new == NULL)
+		return;
+	while (*--end_of_new == *--end_of_old &&
+	       end_of_old != old_path &&
+	       end_of_new != new_path)
+		; /* Do nothing; all in the while loop */
+	/*
+	 * We've found the first non-matching character in the directory
+	 * paths.  That means the current directory we were comparing
+	 * represents the rename.  Move end_of_old and end_of_new back
+	 * to the full directory name.
+	 */
+	if (*end_of_old == '/')
+		end_of_old++;
+	if (*end_of_old != '/')
+		end_of_new++;
+	end_of_old = strchr(end_of_old, '/');
+	end_of_new = strchr(end_of_new, '/');
+
+	/*
+	 * It may have been the case that old_path and new_path were the same
+	 * directory all along.  Don't claim a rename if they're the same.
+	 */
+	old_len = end_of_old - old_path;
+	new_len = end_of_new - new_path;
+
+	if (old_len != new_len || strncmp(old_path, new_path, old_len)) {
+		*old_dir = xstrndup(old_path, old_len);
+		*new_dir = xstrndup(new_path, new_len);
+	}
+}
+
+static struct hashmap *get_directory_renames(struct diff_queue_struct *pairs,
+					     struct tree *tree)
+{
+	struct hashmap *dir_renames;
+	struct hashmap_iter iter;
+	struct dir_rename_entry *entry;
+	int i;
+
+	dir_renames = malloc(sizeof(struct hashmap));
+	dir_rename_init(dir_renames);
+	for (i = 0; i < pairs->nr; ++i) {
+		struct string_list_item *item;
+		int *count;
+		struct diff_filepair *pair = pairs->queue[i];
+		char *old_dir, *new_dir;
+
+		/* File not part of directory rename if it wasn't renamed */
+		if (pair->status != 'R')
+			continue;
+
+		get_renamed_dir_portion(pair->one->path, pair->two->path,
+					&old_dir,        &new_dir);
+		if (!old_dir)
+			/* Directory didn't change at all; ignore this one. */
+			continue;
+
+		entry = dir_rename_find_entry(dir_renames, old_dir);
+		if (!entry) {
+			entry = xmalloc(sizeof(struct dir_rename_entry));
+			dir_rename_entry_init(entry, old_dir);
+			hashmap_put(dir_renames, entry);
+		} else {
+			free(old_dir);
+		}
+		item = string_list_lookup(&entry->possible_new_dirs, new_dir);
+		if (!item) {
+			item = string_list_insert(&entry->possible_new_dirs,
+						  new_dir);
+			item->util = xcalloc(1, sizeof(int));
+		} else {
+			free(new_dir);
+		}
+		count = item->util;
+		*count += 1;
+	}
+
+	hashmap_iter_init(dir_renames, &iter);
+	while ((entry = hashmap_iter_next(&iter))) {
+		int max = 0;
+		int bad_max = 0;
+		char *best = NULL;
+
+		for (i = 0; i < entry->possible_new_dirs.nr; i++) {
+			int *count = entry->possible_new_dirs.items[i].util;
+
+			if (*count == max)
+				bad_max = max;
+			else if (*count > max) {
+				max = *count;
+				best = entry->possible_new_dirs.items[i].string;
+			}
+		}
+		if (bad_max == max)
+			entry->non_unique_new_dir = 1;
+		else {
+			assert(entry->new_dir.len == 0);
+			strbuf_addstr(&entry->new_dir, best);
+		}
+		/* Strings were xstrndup'ed before inserting into string-list,
+		 * so ask string_list to remove the entries for us.
+		 */
+		entry->possible_new_dirs.strdup_strings = 1;
+		string_list_clear(&entry->possible_new_dirs, 1);
+	}
+
+	return dir_renames;
+}
+
 /*
  * Get information of all renames which occurred in 'pairs', making use of
  * any implicit directory renames inferred from the other side of history.
@@ -1695,8 +1827,21 @@ struct rename_info {
 	struct string_list *merge_renames;
 };
 
-static void initial_cleanup_rename(struct diff_queue_struct *pairs)
+static void initial_cleanup_rename(struct diff_queue_struct *pairs,
+				   struct hashmap *dir_renames)
 {
+	struct hashmap_iter iter;
+	struct dir_rename_entry *e;
+
+	hashmap_iter_init(dir_renames, &iter);
+	while ((e = hashmap_iter_next(&iter))) {
+		free(e->dir);
+		strbuf_release(&e->new_dir);
+		/* possible_new_dirs already cleared in get_directory_renames */
+	}
+	hashmap_free(dir_renames, 1);
+	free(dir_renames);
+
 	free(pairs->queue);
 	free(pairs);
 }
@@ -1709,6 +1854,7 @@ static int handle_renames(struct merge_options *o,
 			  struct rename_info *ri)
 {
 	struct diff_queue_struct *head_pairs, *merge_pairs;
+	struct hashmap *dir_re_head, *dir_re_merge;
 	int clean;
 
 	ri->head_renames = NULL;
@@ -1720,6 +1866,9 @@ static int handle_renames(struct merge_options *o,
 	head_pairs = get_diffpairs(o, common, head);
 	merge_pairs = get_diffpairs(o, common, merge);
 
+	dir_re_head = get_directory_renames(head_pairs, head);
+	dir_re_merge = get_directory_renames(merge_pairs, merge);
+
 	ri->head_renames  = get_renames(o, head_pairs, head,
 					 common, head, merge, entries);
 	ri->merge_renames = get_renames(o, merge_pairs, merge,
@@ -1731,8 +1880,8 @@ static int handle_renames(struct merge_options *o,
 	 * data structures are still needed and referenced in
 	 * process_entry().  But there are a few things we can free now.
 	 */
-	initial_cleanup_rename(head_pairs);
-	initial_cleanup_rename(merge_pairs);
+	initial_cleanup_rename(head_pairs, dir_re_head);
+	initial_cleanup_rename(merge_pairs, dir_re_merge);
 
 	return clean;
 }
-- 
2.15.0.408.g850bc54b15


  parent reply	other threads:[~2017-11-29  1:43 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-29  1:42 [PATCH v4 00/34] Add directory rename detection to git Elijah Newren
2017-11-29  1:42 ` [PATCH v4 01/34] Tighten and correct a few testcases for merging and cherry-picking Elijah Newren
2017-11-29  1:42 ` [PATCH v4 02/34] merge-recursive: fix logic ordering issue Elijah Newren
2017-11-29  1:42 ` [PATCH v4 03/34] merge-recursive: add explanation for src_entry and dst_entry Elijah Newren
2017-11-29  1:42 ` [PATCH v4 04/34] directory rename detection: basic testcases Elijah Newren
2017-11-29  1:42 ` [PATCH v4 05/34] directory rename detection: directory splitting testcases Elijah Newren
2017-11-29  1:42 ` [PATCH v4 06/34] directory rename detection: testcases to avoid taking detection too far Elijah Newren
2017-11-29  1:42 ` [PATCH v4 07/34] directory rename detection: partially renamed directory testcase/discussion Elijah Newren
2017-11-29  1:42 ` [PATCH v4 08/34] directory rename detection: files/directories in the way of some renames Elijah Newren
2017-11-29  1:42 ` [PATCH v4 09/34] directory rename detection: testcases checking which side did the rename Elijah Newren
2017-11-29  1:42 ` [PATCH v4 10/34] directory rename detection: more involved edge/corner testcases Elijah Newren
2017-11-29  1:42 ` [PATCH v4 11/34] directory rename detection: testcases exploring possibly suboptimal merges Elijah Newren
2017-11-29  1:42 ` [PATCH v4 12/34] directory rename detection: miscellaneous testcases to complete coverage Elijah Newren
2017-11-29  1:42 ` [PATCH v4 13/34] directory rename detection: tests for handling overwriting untracked files Elijah Newren
2017-11-29  1:42 ` [PATCH v4 14/34] directory rename detection: tests for handling overwriting dirty files Elijah Newren
2017-11-29  1:42 ` [PATCH v4 15/34] merge-recursive: move the get_renames() function Elijah Newren
2017-11-29  1:42 ` [PATCH v4 16/34] merge-recursive: introduce new functions to handle rename logic Elijah Newren
2017-11-29  1:42 ` [PATCH v4 17/34] merge-recursive: fix leaks of allocated renames and diff_filepairs Elijah Newren
2017-11-29  1:42 ` [PATCH v4 18/34] merge-recursive: make !o->detect_rename codepath more obvious Elijah Newren
2017-11-29  1:42 ` [PATCH v4 19/34] merge-recursive: split out code for determining diff_filepairs Elijah Newren
2017-11-29  1:42 ` [PATCH v4 20/34] merge-recursive: add a new hashmap for storing directory renames Elijah Newren
2017-11-29  1:42 ` [PATCH v4 21/34] merge-recursive: make a helper function for cleanup for handle_renames Elijah Newren
2017-11-29  1:42 ` Elijah Newren [this message]
2017-11-29  1:42 ` [PATCH v4 23/34] merge-recursive: check for directory level conflicts Elijah Newren
2017-11-29  1:42 ` [PATCH v4 24/34] merge-recursive: add a new hashmap for storing file collisions Elijah Newren
2017-11-29  1:42 ` [PATCH v4 25/34] merge-recursive: add computation of collisions due to dir rename & merging Elijah Newren
2017-11-29  1:42 ` [PATCH v4 26/34] merge-recursive: check for file level conflicts then get new name Elijah Newren
2017-11-29  1:42 ` [PATCH v4 27/34] merge-recursive: when comparing files, don't include trees Elijah Newren
2017-11-29  1:42 ` [PATCH v4 28/34] merge-recursive: apply necessary modifications for directory renames Elijah Newren
2017-11-29  1:42 ` [PATCH v4 29/34] merge-recursive: avoid clobbering untracked files with " Elijah Newren
2017-11-29  1:42 ` [PATCH v4 30/34] merge-recursive: fix overwriting dirty files involved in renames Elijah Newren
2017-11-29  1:42 ` [PATCH v4 31/34] merge-recursive: fix remaining directory rename + dirty overwrite cases Elijah Newren
2017-11-29  1:42 ` [PATCH v4 32/34] directory rename detection: new testcases showcasing a pair of bugs Elijah Newren
2017-11-29  1:42 ` [PATCH v4 33/34] merge-recursive: avoid spurious rename/rename conflict from dir renames Elijah Newren
2017-11-29  1:42 ` [PATCH v4 34/34] merge-recursive: ensure we write updates for directory-renamed file Elijah Newren
2017-12-13  1:06 ` [PATCH v4 00/34] Add directory rename detection to git Junio C Hamano
2017-12-13  2:01   ` Junio C Hamano
2017-12-13 15:38     ` Elijah Newren
2017-12-13 18:15   ` Ramsay Jones
2017-12-13 19:05     ` Junio C Hamano

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: http://vger.kernel.org/majordomo-info.html

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20171129014237.32570-23-newren@gmail.com \
    --to=newren@gmail.com \
    --cc=git@vger.kernel.org \
    --cc=gitster@pobox.com \
    --cc=sbeller@google.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
Code repositories for project(s) associated with this public inbox

	https://80x24.org/mirrors/git.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).