pretty=format: respect date format options

When running a command like:

  git log --pretty=format:%ad --date=short

the date option was ignored. This patch causes it to use whatever
format was specified by --date (or by --relative-date, etc), just
as the non-user formats would do.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/pretty-formats.txt

@@ -103,7 +103,7 @@ The placeholders are:
 - '%an': author name
 - '%aN': author name (respecting .mailmap)
 - '%ae': author email
-- '%ad': author date
+- '%ad': author date (format respects --date= option)
 - '%aD': author date, RFC2822 style
 - '%ar': author date, relative
 - '%at': author date, UNIX timestamp

archive.c

@@ -48,7 +48,7 @@ static void format_subst(const struct commit *commit,
 		strbuf_add(&fmt, b + 8, c - b - 8);
 
 		strbuf_add(buf, src, b - src);
-		format_commit_message(commit, fmt.buf, buf);
+		format_commit_message(commit, fmt.buf, buf, DATE_NORMAL);
 		len -= c + 1 - src;
 		src  = c + 1;
 	}

builtin-commit.c

@@ -882,7 +882,7 @@ static void print_summary(const char *prefix, const unsigned char *sha1)
 
 	if (!log_tree_commit(&rev, commit)) {
 		struct strbuf buf = STRBUF_INIT;
-		format_commit_message(commit, "%h: %s", &buf);
+		format_commit_message(commit, "%h: %s", &buf, DATE_NORMAL);
 		printf("%s\n", buf.buf);
 		strbuf_release(&buf);
 	}

commit.h

@@ -67,7 +67,8 @@ extern int non_ascii(int);
 struct rev_info; /* in revision.h, it circularly uses enum cmit_fmt */
 extern void get_commit_format(const char *arg, struct rev_info *);
 extern void format_commit_message(const struct commit *commit,
-                                  const void *format, struct strbuf *sb);
+				  const void *format, struct strbuf *sb,
+				  enum date_mode dmode);
 extern void pretty_print_commit(enum cmit_fmt fmt, const struct commit*,
                                 struct strbuf *,
                                 int abbrev, const char *subject,

pretty.c

@@ -310,7 +310,7 @@ static int mailmap_name(struct strbuf *sb, const char *email)
 }
 
 static size_t format_person_part(struct strbuf *sb, char part,
-                               const char *msg, int len)
+				 const char *msg, int len, enum date_mode dmode)
 {
 	/* currently all placeholders have same length */
 	const int placeholder_len = 2;
@@ -377,7 +377,7 @@ static size_t format_person_part(struct strbuf *sb, char part,
 
 	switch (part) {
 	case 'd':	/* date */
-		strbuf_addstr(sb, show_date(date, tz, DATE_NORMAL));
+		strbuf_addstr(sb, show_date(date, tz, dmode));
 		return placeholder_len;
 	case 'D':	/* date, RFC2822 style */
 		strbuf_addstr(sb, show_date(date, tz, DATE_RFC2822));
@@ -409,6 +409,7 @@ struct chunk {
 
 struct format_commit_context {
 	const struct commit *commit;
+	enum date_mode dmode;
 
 	/* These offsets are relative to the start of the commit message. */
 	int commit_header_parsed;
@@ -584,10 +585,12 @@ static size_t format_commit_item(struct strbuf *sb, const char *placeholder,
 		return 1;
 	case 'a':	/* author ... */
 		return format_person_part(sb, placeholder[1],
-		                   msg + c->author.off, c->author.len);
+				   msg + c->author.off, c->author.len,
+				   c->dmode);
 	case 'c':	/* committer ... */
 		return format_person_part(sb, placeholder[1],
-		                   msg + c->committer.off, c->committer.len);
+				   msg + c->committer.off, c->committer.len,
+				   c->dmode);
 	case 'e':	/* encoding */
 		strbuf_add(sb, msg + c->encoding.off, c->encoding.len);
 		return 1;
@@ -599,12 +602,14 @@ static size_t format_commit_item(struct strbuf *sb, const char *placeholder,
 }
 
 void format_commit_message(const struct commit *commit,
-                           const void *format, struct strbuf *sb)
+			   const void *format, struct strbuf *sb,
+			   enum date_mode dmode)
 {
 	struct format_commit_context context;
 
 	memset(&context, 0, sizeof(context));
 	context.commit = commit;
+	context.dmode = dmode;
 	strbuf_expand(sb, format, format_commit_item, &context);
 }
 
@@ -770,7 +775,7 @@ void pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit,
 	const char *encoding;
 
 	if (fmt == CMIT_FMT_USERFORMAT) {
-		format_commit_message(commit, user_format, sb);
+		format_commit_message(commit, user_format, sb, dmode);
 		return;
 	}
 

t/t6006-rev-list-format.sh

@@ -139,6 +139,12 @@ commit 131a310eb913d107dd3c09a65d1651175898735d
 commit 86c75cfd708a0e5868dc876ed5b8bb66c80b4873
 EOF
 
+test_expect_success '%ad respects --date=' '
+	echo 2005-04-07 >expect.ad-short &&
+	git log -1 --date=short --pretty=tformat:%ad >output.ad-short master &&
+	test_cmp expect.ad-short output.ad-short
+'
+
 test_expect_success 'empty email' '
 	test_tick &&
 	C=$(GIT_AUTHOR_EMAIL= git commit-tree HEAD^{tree} </dev/null) &&