commit: prepare logmsg_reencode to handle arbitrary repositories

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

commit.h

@@ -180,6 +180,14 @@ extern int has_non_ascii(const char *text);
 extern const char *logmsg_reencode(const struct commit *commit,
 				   char **commit_encoding,
 				   const char *output_encoding);
+const char *repo_logmsg_reencode(struct repository *r,
+				 const struct commit *commit,
+				 char **commit_encoding,
+				 const char *output_encoding);
+#ifndef NO_THE_REPOSITORY_COMPATIBILITY_MACROS
+#define logmsg_reencode(c, enc, out) repo_logmsg_reencode(the_repository, c, enc, out)
+#endif
+
 extern const char *skip_blank_lines(const char *msg);
 
 /** Removes the first commit from a list sorted by date, and adds all

contrib/coccinelle/the_repository.pending.cocci

@@ -123,3 +123,12 @@ expression F;
 - unuse_commit_buffer(
 + repo_unuse_commit_buffer(the_repository,
   E, F);
+
+@@
+expression E;
+expression F;
+expression G;
+@@
+- logmsg_reencode(
++ repo_logmsg_reencode(the_repository,
+  E, F, G);

pretty.c

@@ -595,14 +595,15 @@ static char *replace_encoding_header(char *buf, const char *encoding)
 	return strbuf_detach(&tmp, NULL);
 }
 
-const char *logmsg_reencode(const struct commit *commit,
+const char *repo_logmsg_reencode(struct repository *r,
-			    char **commit_encoding,
+				 const struct commit *commit,
-			    const char *output_encoding)
+				 char **commit_encoding,
+				 const char *output_encoding)
 {
 	static const char *utf8 = "UTF-8";
 	const char *use_encoding;
 	char *encoding;
-	const char *msg = get_commit_buffer(commit, NULL);
+	const char *msg = repo_get_commit_buffer(r, commit, NULL);
 	char *out;
 
 	if (!output_encoding || !*output_encoding) {
@@ -630,7 +631,7 @@ const char *logmsg_reencode(const struct commit *commit,
 		 * the cached copy from get_commit_buffer, we need to duplicate it
 		 * to avoid munging the cached copy.
 		 */
-		if (msg == get_cached_commit_buffer(the_repository, commit, NULL))
+		if (msg == get_cached_commit_buffer(r, commit, NULL))
 			out = xstrdup(msg);
 		else
 			out = (char *)msg;
@@ -644,7 +645,7 @@ const char *logmsg_reencode(const struct commit *commit,
 		 */
 		out = reencode_string(msg, output_encoding, use_encoding);
 		if (out)
-			unuse_commit_buffer(commit, msg);
+			repo_unuse_commit_buffer(r, commit, msg);
 	}
 
 	/*