Re: [Bug report] git status doesn't escape paths of untracked files

["René Scharfe" <l.s.r@web.de>]

Am 08.09.20 um 19:39 schrieb Junio C Hamano:
> Junio C Hamano <gitster@pobox.com> writes:
>
>> I agree with your "the special case handling needs to be taught to
>> the wt_shortstatus_other()"; a refactored helper function called
>> by both places would help.
>
> I came up with this.
>
>  - I very much like the fact that I got rid of the "directly print
>    dq and then feed the remainder of (un)quoted path plus trailing
>    dq to the normal printing logic" from print_cquoted(), even
>    though strbuf_insertstr() a single byte to the beginning of the
>    buffer feels a bit wasteful.

I don't particularly like how this print* function takes a printf
format, but doesn't interpret its remaining arguments like printf does.

>  - I think the short status output for unmerged paths deserve the
>    same quoting treatment, so an extra helper function pays off even
>    better than our plan to fix "untracked/ignored".
>
>  - I am undecided if I like that the helper formats and also prints;
>    I was hoping I can come up with a pure formatting helper that
>    does not do I/O but it seems to be hard to arrange for the
>    current callers.

How about something like this then?

diff --git a/wt-status.c b/wt-status.c
index ff43932402..e0711aff04 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -1829,19 +1829,19 @@ static void wt_longstatus_print(struct wt_status *s)
 		wt_longstatus_print_stash_summary(s);
 }

-static void print_cquoted(const char *fmt, const char *path, const char *prefix)
+static const char *cquote(const char *in, const char *prefix, struct strbuf *out)
 {
-	struct strbuf onebuf = STRBUF_INIT;
-	const char *one;
-
-	one = quote_path(path, prefix, &onebuf);
-	if (*one != '"' && strchr(one, ' ')) {
-		strbuf_insertstr(&onebuf, 0, "\"");
-		strbuf_addch(&onebuf, '"');
-		one = onebuf.buf;
-	}
-	printf(fmt, one);
-	strbuf_release(&onebuf);
+	struct strbuf sb = STRBUF_INIT;
+	const char *rel = relative_path(in, prefix, &sb);
+	int need_quotes = *rel != '"' && strchr(rel, ' ');
+	strbuf_reset(out);
+	if (need_quotes)
+		strbuf_addch(out, '"');
+	quote_c_style(rel, out, NULL, 0);
+	if (need_quotes)
+		strbuf_addch(out, '"');
+	strbuf_release(&sb);
+	return out->buf;
 }

 static void wt_shortstatus_unmerged(struct string_list_item *it,
@@ -1849,6 +1849,7 @@ static void wt_shortstatus_unmerged(struct string_list_item *it,
 {
 	struct wt_status_change_data *d = it->util;
 	const char *how = "??";
+	struct strbuf sb = STRBUF_INIT;

 	switch (d->stagemask) {
 	case 1: how = "DD"; break; /* both deleted */
@@ -1863,13 +1864,15 @@ static void wt_shortstatus_unmerged(struct string_list_item *it,
 	if (s->null_termination)
 		fprintf(stdout, " %s%c", it->string, 0);
 	else
-		print_cquoted(" %s\n", it->string, s->prefix);
+		printf(" %s\n", cquote(it->string, s->prefix, &sb));
+	strbuf_release(&sb);
 }

 static void wt_shortstatus_status(struct string_list_item *it,
 			 struct wt_status *s)
 {
 	struct wt_status_change_data *d = it->util;
+	struct strbuf sb = STRBUF_INIT;

 	if (d->index_status)
 		color_fprintf(s->fp, color(WT_STATUS_UPDATED, s), "%c", d->index_status);
@@ -1886,20 +1889,24 @@ static void wt_shortstatus_status(struct string_list_item *it,
 			fprintf(stdout, "%s%c", d->rename_source, 0);
 	} else {
 		if (d->rename_source)
-			print_cquoted("%s -> ", d->rename_source, s->prefix);
-		print_cquoted("%s\n", it->string, s->prefix);
+			printf("%s -> ", cquote(d->rename_source, s->prefix, &sb));
+		printf("%s\n", cquote(it->string, s->prefix, &sb));
 	}
+	strbuf_release(&sb);
 }

 static void wt_shortstatus_other(struct string_list_item *it,
 				 struct wt_status *s, const char *sign)
 {
+	struct strbuf sb = STRBUF_INIT;
+
 	if (s->null_termination) {
 		fprintf(stdout, "%s %s%c", sign, it->string, 0);
 	} else {
 		color_fprintf(s->fp, color(WT_STATUS_UNTRACKED, s), "%s", sign);
-		print_cquoted(" %s\n", it->string, s->prefix);
+		printf(" %s\n", cquote(it->string, s->prefix, &sb));
 	}
+	strbuf_release(&sb);
 }

 static void wt_shortstatus_print_tracking(struct wt_status *s)