Re: [PATCH] combine-diff: use diff_opts->a_prefix

[Junio C Hamano <gitster@pobox.com>]

Salikh Zakirov <salikh@gmail.com> writes:

> The introduction of configurable dir prefix for diff headers in commit
> eab9a40b 'Teach diff machinery to display other prefixes than "a/" and "b/"'
> missed combined diff generation.
>
> Signed-off-by: Salikh Zakirov <salikh@gmail.com>
> ---
>
> I realize that this fix is ugly, so I am all ears for a suggestion
> of a better fix.

It is not so ugly, but I think the original code is broken wrt
its calling of quote_c_style().  It will output "a/" literally
and then would spit out the path with quoting.  IOW, you would
get something like:

	--- a/"foo\tbar"
        +++ b/"foo\tbar"

when it should show:

	--- "a/foo\tbar"
        +++ "b/foo\tbar"

Incidentally, I just noticed that diff.c::emit_rewrite_diff()
has the same bug.

Here is a fix to combine-diff.c

-- >8 -- 
[PATCH] combine-diff: Fix path quoting

Earlier when showing combined diff, the filenames on the ---/+++
header lines were quoted incorrectly.  a/ (or b/) prefix was
output literally and then the path was output, with c-quoting.

This fixes the quoting logic, and while at it, adjusts the code
to use the customizable prefix (a_prefix and b_prefix)
introduced recently.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 combine-diff.c |   41 +++++++++++++++++++++++++++++++----------
 1 files changed, 31 insertions(+), 10 deletions(-)

diff --git a/combine-diff.c b/combine-diff.c
index e22db89..7d71033 100644
--- a/combine-diff.c
+++ b/combine-diff.c
@@ -646,12 +646,28 @@ static void reuse_combine_diff(struct sline *sline, unsigned long cnt,
 	sline->p_lno[i] = sline->p_lno[j];
 }
 
-static void dump_quoted_path(const char *prefix, const char *path,
+static void dump_quoted_path(const char *head,
+			     const char *prefix,
+			     const char *path,
 			     const char *c_meta, const char *c_reset)
 {
-	printf("%s%s", c_meta, prefix);
-	quote_c_style(path, NULL, stdout, 0);
-	printf("%s\n", c_reset);
+	static struct strbuf buf = STRBUF_INIT;
+
+	strbuf_reset(&buf);
+	strbuf_addstr(&buf, c_meta);
+	strbuf_addstr(&buf, head);
+	if (quote_c_style(prefix, NULL, NULL, 0) ||
+	    quote_c_style(path, NULL, NULL, 0)) {
+		strbuf_addch(&buf, '"');
+		quote_c_style(prefix, &buf, NULL, 1);
+		quote_c_style(path, &buf, NULL, 1);
+		strbuf_addch(&buf, '"');
+	} else {
+		strbuf_addstr(&buf, prefix);
+		strbuf_addstr(&buf, path);
+	}
+	strbuf_addstr(&buf, c_reset);
+	puts(buf.buf);
 }
 
 static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
@@ -793,7 +809,7 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
 		if (rev->loginfo && !rev->no_commit_id)
 			show_log(rev, opt->msg_sep);
 		dump_quoted_path(dense ? "diff --cc " : "diff --combined ",
-				 elem->path, c_meta, c_reset);
+				 "", elem->path, c_meta, c_reset);
 		printf("%sindex ", c_meta);
 		for (i = 0; i < num_parent; i++) {
 			abb = find_unique_abbrev(elem->parent[i].sha1,
@@ -829,14 +845,19 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
 			printf("%s\n", c_reset);
 		}
 		if (added)
-			dump_quoted_path("--- /dev/", "null", c_meta, c_reset);
+			dump_quoted_path("--- ", "", "/dev/null",
+					 c_meta, c_reset);
 		else
-			dump_quoted_path("--- a/", elem->path, c_meta, c_reset);
+			dump_quoted_path("--- ", opt->a_prefix, elem->path,
+					 c_meta, c_reset);
 		if (deleted)
-			dump_quoted_path("+++ /dev/", "null", c_meta, c_reset);
+			dump_quoted_path("+++ ", "", "/dev/null",
+					 c_meta, c_reset);
 		else
-			dump_quoted_path("+++ b/", elem->path, c_meta, c_reset);
-		dump_sline(sline, cnt, num_parent, DIFF_OPT_TST(opt, COLOR_DIFF));
+			dump_quoted_path("+++ ", opt->b_prefix, elem->path,
+					 c_meta, c_reset);
+		dump_sline(sline, cnt, num_parent,
+			   DIFF_OPT_TST(opt, COLOR_DIFF));
 	}
 	free(result);
 
-- 
1.5.4.rc1.23.g3a969