Merge branch 'en/rename-progress'

Historically, the diff machinery for rename detection had a
hardcoded limit of 32k paths; this is being lifted to allow users
trade cycles with a (possibly) easier to read result.

* en/rename-progress:
  diffcore-rename: make diff-tree -l0 mean -l<large>
  sequencer: show rename progress during cherry picks
  diff: remove silent clamp of renameLimit
  progress: fix progress meters when dealing with lots of work
  sequencer: warn when internal merge may be suboptimal due to renameLimit

diff.c

@@ -5454,7 +5454,7 @@ void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
 		warning(_(rename_limit_warning));
 	else
 		return;
-	if (0 < needed && needed < 32767)
+	if (0 < needed)
 		warning(_(rename_limit_advice), varname, needed);
 }
 

diffcore-rename.c

@@ -391,14 +391,12 @@ static int too_many_rename_candidates(int num_create,
 	 * growing larger than a "rename_limit" square matrix, ie:
 	 *
 	 *    num_create * num_src > rename_limit * rename_limit
-	 *
-	 * but handles the potential overflow case specially (and we
-	 * assume at least 32-bit integers)
 	 */
-	if (rename_limit <= 0 || rename_limit > 32767)
+	if (rename_limit <= 0)
 		rename_limit = 32767;
 	if ((num_create <= rename_limit || num_src <= rename_limit) &&
-	    (num_create * num_src <= rename_limit * rename_limit))
+	    ((uint64_t)num_create * (uint64_t)num_src
+	     <= (uint64_t)rename_limit * (uint64_t)rename_limit))
 		return 0;
 
 	options->needed_rename_limit =
@@ -415,7 +413,8 @@ static int too_many_rename_candidates(int num_create,
 		num_src++;
 	}
 	if ((num_create <= rename_limit || num_src <= rename_limit) &&
-	    (num_create * num_src <= rename_limit * rename_limit))
+	    ((uint64_t)num_create * (uint64_t)num_src
+	     <= (uint64_t)rename_limit * (uint64_t)rename_limit))
 		return 2;
 	return 1;
 }
@@ -534,7 +533,7 @@ void diffcore_rename(struct diff_options *options)
 	if (options->show_rename_progress) {
 		progress = start_delayed_progress(
 				_("Performing inexact rename detection"),
-				rename_dst_nr * rename_src_nr);
+				(uint64_t)rename_dst_nr * (uint64_t)rename_src_nr);
 	}
 
 	mx = xcalloc(st_mult(NUM_CANDIDATE_PER_DST, num_create), sizeof(*mx));
@@ -571,7 +570,7 @@ void diffcore_rename(struct diff_options *options)
 			diff_free_filespec_blob(two);
 		}
 		dst_cnt++;
-		display_progress(progress, (i+1)*rename_src_nr);
+		display_progress(progress, (uint64_t)(i+1)*(uint64_t)rename_src_nr);
 	}
 	stop_progress(&progress);
 

progress.c

@@ -30,8 +30,8 @@ struct throughput {
 
 struct progress {
 	const char *title;
-	int last_value;
-	unsigned total;
+	uint64_t last_value;
+	uint64_t total;
 	unsigned last_percent;
 	unsigned delay;
 	struct throughput *throughput;
@@ -78,7 +78,7 @@ static int is_foreground_fd(int fd)
 	return tpgrp < 0 || tpgrp == getpgid(0);
 }
 
-static int display(struct progress *progress, unsigned n, const char *done)
+static int display(struct progress *progress, uint64_t n, const char *done)
 {
 	const char *eol, *tp;
 
@@ -93,9 +93,10 @@ static int display(struct progress *progress, unsigned n, const char *done)
 		if (percent != progress->last_percent || progress_update) {
 			progress->last_percent = percent;
 			if (is_foreground_fd(fileno(stderr)) || done) {
-				fprintf(stderr, "%s: %3u%% (%u/%u)%s%s",
-					progress->title, percent, n,
-					progress->total, tp, eol);
+				fprintf(stderr, "%s: %3u%% (%"PRIuMAX"/%"PRIuMAX")%s%s",
+					progress->title, percent,
+					(uintmax_t)n, (uintmax_t)progress->total,
+					tp, eol);
 				fflush(stderr);
 			}
 			progress_update = 0;
@@ -103,8 +104,8 @@ static int display(struct progress *progress, unsigned n, const char *done)
 		}
 	} else if (progress_update) {
 		if (is_foreground_fd(fileno(stderr)) || done) {
-			fprintf(stderr, "%s: %u%s%s",
-				progress->title, n, tp, eol);
+			fprintf(stderr, "%s: %"PRIuMAX"%s%s",
+				progress->title, (uintmax_t)n, tp, eol);
 			fflush(stderr);
 		}
 		progress_update = 0;
@@ -114,7 +115,7 @@ static int display(struct progress *progress, unsigned n, const char *done)
 	return 0;
 }
 
-static void throughput_string(struct strbuf *buf, off_t total,
+static void throughput_string(struct strbuf *buf, uint64_t total,
 			      unsigned int rate)
 {
 	strbuf_reset(buf);
@@ -125,7 +126,7 @@ static void throughput_string(struct strbuf *buf, off_t total,
 	strbuf_addstr(buf, "/s");
 }
 
-void display_throughput(struct progress *progress, off_t total)
+void display_throughput(struct progress *progress, uint64_t total)
 {
 	struct throughput *tp;
 	uint64_t now_ns;
@@ -187,12 +188,12 @@ void display_throughput(struct progress *progress, off_t total)
 		display(progress, progress->last_value, NULL);
 }
 
-int display_progress(struct progress *progress, unsigned n)
+int display_progress(struct progress *progress, uint64_t n)
 {
 	return progress ? display(progress, n, NULL) : 0;
 }
 
-static struct progress *start_progress_delay(const char *title, unsigned total,
+static struct progress *start_progress_delay(const char *title, uint64_t total,
 					     unsigned delay)
 {
 	struct progress *progress = malloc(sizeof(*progress));
@@ -213,12 +214,12 @@ static struct progress *start_progress_delay(const char *title, unsigned total,
 	return progress;
 }
 
-struct progress *start_delayed_progress(const char *title, unsigned total)
+struct progress *start_delayed_progress(const char *title, uint64_t total)
 {
 	return start_progress_delay(title, total, 2);
 }
 
-struct progress *start_progress(const char *title, unsigned total)
+struct progress *start_progress(const char *title, uint64_t total)
 {
 	return start_progress_delay(title, total, 0);
 }

progress.h

@@ -3,10 +3,10 @@
 
 struct progress;
 
-void display_throughput(struct progress *progress, off_t total);
-int display_progress(struct progress *progress, unsigned n);
-struct progress *start_progress(const char *title, unsigned total);
-struct progress *start_delayed_progress(const char *title, unsigned total);
+void display_throughput(struct progress *progress, uint64_t total);
+int display_progress(struct progress *progress, uint64_t n);
+struct progress *start_progress(const char *title, uint64_t total);
+struct progress *start_delayed_progress(const char *title, uint64_t total);
 void stop_progress(struct progress **progress);
 void stop_progress_msg(struct progress **progress, const char *msg);
 

sequencer.c

@@ -449,6 +449,7 @@ static int do_recursive_merge(struct commit *base, struct commit *next,
 	o.branch2 = next ? next_label : "(empty tree)";
 	if (is_rebase_i(opts))
 		o.buffer_output = 2;
+	o.show_rename_progress = 1;
 
 	head_tree = parse_tree_indirect(head);
 	next_tree = next ? next->tree : empty_tree();
@@ -463,6 +464,7 @@ static int do_recursive_merge(struct commit *base, struct commit *next,
 	if (is_rebase_i(opts) && clean <= 0)
 		fputs(o.obuf.buf, stdout);
 	strbuf_release(&o.obuf);
+	diff_warn_rename_limit("merge.renamelimit", o.needed_rename_limit, 0);
 	if (clean < 0)
 		return clean;
 

t/t4001-diff-rename.sh

@@ -230,4 +230,19 @@ test_expect_success 'rename pretty print common prefix and suffix overlap' '
 	test_i18ngrep " d/f/{ => f}/e " output
 '
 
+test_expect_success 'diff-tree -l0 defaults to a big rename limit, not zero' '
+	test_write_lines line1 line2 line3 >myfile &&
+	git add myfile &&
+	git commit -m x &&
+
+	test_write_lines line1 line2 line4 >myotherfile &&
+	git rm myfile &&
+	git add myotherfile &&
+	git commit -m x &&
+
+	git diff-tree -M -l0 HEAD HEAD^ >actual &&
+	# Verify that a rename from myotherfile to myfile was detected
+	grep "myotherfile.*myfile" actual
+'
+
 test_done