[PATCH v2 00/15] Towards a more awesome git branch

@@ -867,24 +867,29 @@ static void sort_refs(struct ref_sort *sort, struct refinfo **refs, int num_refs
 static void print_value(struct refinfo *ref, int atom, int quote_style)
 {
 	struct atom_value *v;
+	struct strbuf sb = STRBUF_INIT;
 	get_value(ref, atom, &v);
 	switch (quote_style) {
 	case QUOTE_NONE:
 		fputs(v->s, stdout);
 		break;
 	case QUOTE_SHELL:
-		sq_quote_print(stdout, v->s);
+		sq_quote_buf(&sb, v->s);
 		break;
 	case QUOTE_PERL:
-		perl_quote_print(stdout, v->s);
+		perl_quote_buf(&sb, v->s);
 		break;
 	case QUOTE_PYTHON:
-		python_quote_print(stdout, v->s);
+		python_quote_buf(&sb, v->s);
 		break;
 	case QUOTE_TCL:
-		tcl_quote_print(stdout, v->s);
+		tcl_quote_buf(&sb, v->s);
 		break;
 	}
+	if (quote_style != QUOTE_NONE) {
+		fputs(sb.buf, stdout);
+		strbuf_release(&sb);
+	}
 }
 
 static int hex1(char ch)

@@ -463,72 +463,72 @@ int unquote_c_style(struct strbuf *sb, const char *quoted, const char **endp)
 
 /* quoting as a string literal for other languages */
 
-void perl_quote_print(FILE *stream, const char *src)
+void perl_quote_buf(struct strbuf *sb, const char *src)
 {
 	const char sq = '\'';
 	const char bq = '\\';
 	char c;
 
-	fputc(sq, stream);
+	strbuf_addch(sb, sq);
 	while ((c = *src++)) {
 		if (c == sq || c == bq)
-			fputc(bq, stream);
-		fputc(c, stream);
+			strbuf_addch(sb, bq);
+		strbuf_addch(sb, c);
 	}
-	fputc(sq, stream);
+	strbuf_addch(sb, sq);
 }
 
-void python_quote_print(FILE *stream, const char *src)
+void python_quote_buf(struct strbuf *sb, const char *src)
 {
 	const char sq = '\'';
 	const char bq = '\\';
 	const char nl = '\n';
 	char c;
 
-	fputc(sq, stream);
+	strbuf_addch(sb, sq);
 	while ((c = *src++)) {
 		if (c == nl) {
-			fputc(bq, stream);
-			fputc('n', stream);
+			strbuf_addch(sb, bq);
+			strbuf_addch(sb, 'n');
 			continue;
 		}
 		if (c == sq || c == bq)
-			fputc(bq, stream);
-		fputc(c, stream);
+			strbuf_addch(sb, bq);
+		strbuf_addch(sb, c);
 	}
-	fputc(sq, stream);
+	strbuf_addch(sb, sq);
 }
 
-void tcl_quote_print(FILE *stream, const char *src)
+void tcl_quote_buf(struct strbuf *sb, const char *src)
 {
 	char c;
 
-	fputc('"', stream);
+	strbuf_addch(sb, '"');
 	while ((c = *src++)) {
 		switch (c) {
 		case '[': case ']':
 		case '{': case '}':
 		case '$': case '\\': case '"':
-			fputc('\\', stream);
+			strbuf_addch(sb, '\\');
 		default:
-			fputc(c, stream);
+			strbuf_addch(sb, c);
 			break;
 		case '\f':
-			fputs("\\f", stream);
+			strbuf_addstr(sb, "\\f");
 			break;
 		case '\r':
-			fputs("\\r", stream);
+			strbuf_addstr(sb, "\\r");
 			break;
 		case '\n':
-			fputs("\\n", stream);
+			strbuf_addstr(sb, "\\n");
 			break;
 		case '\t':
-			fputs("\\t", stream);
+			strbuf_addstr(sb, "\\t");
 			break;
 		case '\v':
-			fputs("\\v", stream);
+			strbuf_addstr(sb, "\\v");
 			break;
 		}
 	}
-	fputc('"', stream);
+	strbuf_addch(sb, '"');
 }

@@ -69,8 +69,8 @@ extern char *quote_path_relative(const char *in, int len,
 			  struct strbuf *out, const char *prefix);
 
 /* quoting as a string literal for other languages */
-extern void perl_quote_print(FILE *stream, const char *src);
-extern void python_quote_print(FILE *stream, const char *src);
-extern void tcl_quote_print(FILE *stream, const char *src);
+extern void perl_quote_buf(struct strbuf *sb, const char *src);
+extern void python_quote_buf(struct strbuf *sb, const char *src);
+extern void tcl_quote_buf(struct strbuf *sb, const char *src);
 
 #endif

@@ -42,23 +42,6 @@ void sq_quote_buf(struct strbuf *dst, const char *src)
 	free(to_free);
 }
 
-void sq_quote_print(FILE *stream, const char *src)
-{
-	char c;
-
-	fputc('\'', stream);
-	while ((c = *src++)) {
-		if (need_bs_quote(c)) {
-			fputs("'\\", stream);
-			fputc(c, stream);
-			fputc('\'', stream);
-		} else {
-			fputc(c, stream);
-		}
-	}
-	fputc('\'', stream);
-}
-
 void sq_quote_argv(struct strbuf *dst, const char** argv, size_t maxlen)
 {
 	int i;

@@ -27,8 +27,6 @@ struct strbuf;
  * excluding the final null regardless of the buffer size.
  */
 
-extern void sq_quote_print(FILE *stream, const char *src);
-
 extern void sq_quote_buf(struct strbuf *, const char *src);
 extern void sq_quote_argv(struct strbuf *, const char **argv, size_t maxlen);
 

@@ -864,31 +864,31 @@ static void sort_refs(struct ref_sort *sort, struct refinfo **refs, int num_refs
 	qsort(refs, num_refs, sizeof(struct refinfo *), compare_refs);
 }
 
-static void print_value(struct refinfo *ref, int atom, int quote_style)
+static void print_value(struct strbuf *sb, struct refinfo *ref,
+			int atom, int quote_style)
 {
 	struct atom_value *v;
-	struct strbuf sb = STRBUF_INIT;
 	get_value(ref, atom, &v);
 	switch (quote_style) {
 	case QUOTE_NONE:
-		fputs(v->s, stdout);
+		strbuf_addstr(sb, v->s);
 		break;
 	case QUOTE_SHELL:
-		sq_quote_buf(&sb, v->s);
+		sq_quote_buf(sb, v->s);
 		break;
 	case QUOTE_PERL:
-		perl_quote_buf(&sb, v->s);
+		perl_quote_buf(sb, v->s);
 		break;
 	case QUOTE_PYTHON:
-		python_quote_buf(&sb, v->s);
+		python_quote_buf(sb, v->s);
 		break;
 	case QUOTE_TCL:
-		tcl_quote_buf(&sb, v->s);
+		tcl_quote_buf(sb, v->s);
 		break;
 	}
 	if (quote_style != QUOTE_NONE) {
-		fputs(sb.buf, stdout);
-		strbuf_release(&sb);
+		fputs(sb->buf, stdout);
+		strbuf_release(sb);
 	}
 }
 

@@ -910,7 +910,7 @@ static int hex2(const char *cp)
 		return -1;
 }
 
-static void emit(const char *cp, const char *ep)
+static void emit(struct strbuf *sb, const char *cp, const char *ep)
 {
 	while (*cp && (!ep || cp < ep)) {
 		if (*cp == '%') {

@@ -919,32 +919,47 @@ static void emit(const char *cp, const char *ep)
 			else {
 				int ch = hex2(cp + 1);
 				if (0 <= ch) {
-					putchar(ch);
+					strbuf_addch(sb, ch);
 					cp += 3;
 					continue;
 				}
 			}
 		}
-		putchar(*cp);
+		strbuf_addch(sb, *cp);
 		cp++;
 	}
 }
 
-static void show_ref(struct refinfo *info, const char *format, int quote_style)
+static void show_ref(struct strbuf *sb, struct refinfo *info,
+		     const char *format, int quote_style)
 {
 	const char *cp, *sp, *ep;
 
 	for (cp = format; *cp && (sp = find_next(cp)); cp = ep + 1) {
 		ep = strchr(sp, ')');
 		if (cp < sp)
-			emit(cp, sp);
-		print_value(info, parse_atom(sp + 2, ep), quote_style);
+			emit(sb, cp, sp);
+		print_value(sb, info, parse_atom(sp + 2, ep), quote_style);
 	}
 	if (*cp) {
 		sp = cp + strlen(cp);
-		emit(cp, sp);
+		emit(sb, cp, sp);
 	}
-	putchar('\n');
+	strbuf_addch(sb, '\n');
+}
+
+static void show_refs(struct refinfo **refs, int maxcount,
+		      const char *format, int quote_style)
+{
+	struct strbuf sb = STRBUF_INIT;
+	int i;
+
+	for (i = 0; i < maxcount; i++) {
+		strbuf_reset(&sb);
+		show_ref(&sb, refs[i], format, quote_style);
+		fputs(sb.buf, stdout);
+	}
+	strbuf_release(&sb);
 }
 
 static struct ref_sort *default_sort(void)

@@ -987,7 +1002,7 @@ static char const * const for_each_ref_usage[] = {
 
 int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
 {
-	int i, num_refs;
+	int num_refs;
 	const char *format = "%(objectname) %(objecttype)\t%(refname)";
 	struct ref_sort *sort = NULL, **sort_tail = &sort;
 	int maxcount = 0, quote_style = 0;

@@ -1041,7 +1056,7 @@ int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
 
 	if (!maxcount || num_refs < maxcount)
 		maxcount = num_refs;
-	for (i = 0; i < maxcount; i++)
-		show_ref(refs[i], format, quote_style);
+
+	show_refs(refs, maxcount, format, quote_style);
 	return 0;
 }

@@ -1061,7 +1061,8 @@ static size_t parse_padding_placeholder(struct strbuf *sb,
 
 static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 				const char *placeholder,
-				void *context)
+				void *context,
+				int no_recurse)
 {
 	struct format_commit_context *c = context;
 	const struct commit *commit = c->commit;

@@ -1069,7 +1070,7 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 	struct commit_list *p;
 	int h1, h2;
 
-	if (c->pretty_ctx->format) {
+	if (!no_recurse && c->pretty_ctx->format) {
 		struct strbuf subst = STRBUF_INIT;
 		int ret = c->pretty_ctx->format(sb, placeholder, context,
 						c->pretty_ctx->user_data,

@@ -1083,7 +1084,7 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 			 * ret: the length of the original string
 			 * before substitution.
 			 */
-			ret = format_commit_one(sb, subst.buf, context) ? ret : 0;
+			ret = format_commit_one(sb, subst.buf, context, 1) ? ret : 0;
 			strbuf_release(&subst);
 			return ret;
 		} else if (ret)

@@ -1332,7 +1333,7 @@ static size_t format_and_pad_commit(struct strbuf *sb, /* in UTF-8 */
 	}
 	while (1) {
 		int modifier = *placeholder == 'C';
-		int consumed = format_commit_one(&local_sb, placeholder, c);
+		int consumed = format_commit_one(&local_sb, placeholder, c, 0);
 		total_consumed += consumed;
 
 		if (!modifier)

@@ -1452,7 +1453,7 @@ static size_t format_commit_item(struct strbuf *sb, /* in UTF-8 */
 	if (((struct format_commit_context *)context)->flush_type != no_flush)
 		consumed = format_and_pad_commit(sb, placeholder, context);
 	else
-		consumed = format_commit_one(sb, placeholder, context);
+		consumed = format_commit_one(sb, placeholder, context, 0);
 	if (magic == NO_MAGIC)
 		return consumed;
 

@@ -78,6 +78,12 @@ enum cmit_fmt {
 	CMIT_FMT_UNSPECIFIED
 };
 
+typedef size_t (*format_message_fn)(struct strbuf *sb,
+				const char *placeholder,
+				void *format_context,
+				void *user_data,
+				struct strbuf *placeholder_subst);
+
 struct pretty_print_context {
 	enum cmit_fmt fmt;
 	int abbrev;

@@ -92,6 +98,8 @@ struct pretty_print_context {
 	const char *output_encoding;
 	struct string_list *mailmap;
 	int color;
+	format_message_fn format;
+	void *user_data;
 };
 
 struct userformat_want {

@@ -1069,6 +1069,31 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 	struct commit_list *p;
 	int h1, h2;
 
+	if (c->pretty_ctx->format) {
+		struct strbuf subst = STRBUF_INIT;
+		int ret = c->pretty_ctx->format(sb, placeholder, context,
+						c->pretty_ctx->user_data,
+						&subst);
+		if (ret && subst.len) {
+			/*
+			 * Something was parsed by format(), and a
+			 * placeholder-substitution was set.
+			 * Recursion is required to override the
+			 * return value of format_commit_one() with
+			 * ret: the length of the original string
+			 * before substitution.
+			 */
+			ret = format_commit_one(sb, subst.buf, context) ? ret : 0;
+			strbuf_release(&subst);
+			return ret;
+		} else if (ret)
+			/*
+			 * Something was parsed by format(), but
+			 * no placeholder-substitution was set.
+			 */
+			return ret;
+	}
+
 	/* these are independent of the commit */
 	switch (placeholder[0]) {
 	case 'C':

@@ -1156,6 +1156,9 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 	}
 
 	/* these depend on the commit */
+	if (!commit)
+		return 0;
+
 	if (!commit->object.parsed)
 		parse_object(commit->object.sha1);
 

@@ -1276,6 +1279,9 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 	}
 
 
+	if (!c->message)
+		return 0;
+
 	/* For the rest we have to parse the commit header. */
 	if (!c->commit_header_parsed)
 		parse_commit_header(c);

@@ -1510,9 +1516,10 @@ void format_commit_message(const struct commit *commit,
 	context.commit = commit;
 	context.pretty_ctx = pretty_ctx;
 	context.wrap_start = sb->len;
-	context.message = logmsg_reencode(commit,
-					  &context.commit_encoding,
-					  output_enc);
+	if (commit)
+		context.message = logmsg_reencode(commit,
+						  &context.commit_encoding,
+						  output_enc);
 
 	strbuf_expand(sb, format, format_commit_item, &context);
 	rewrap_message_tail(sb, &context, 0, 0, 0);

@@ -1535,7 +1542,8 @@ void format_commit_message(const struct commit *commit,
 	}
 
 	free(context.commit_encoding);
-	logmsg_free(context.message, commit);
+	if (commit)
+		logmsg_free(context.message, commit);
 	free(context.signature_check.gpg_output);
 	free(context.signature_check.signer);
 }

@@ -9,7 +9,8 @@ SYNOPSIS
 --------
 [verse]
 'git for-each-ref' [--count=<count>] [--shell|--perl|--python|--tcl]
-		   [(--sort=<key>)...] [--format=<format>] [<pattern>...]
+		   [(--sort=<key>)...] [--format=<format>|--pretty=<pretty>]
+		   [<pattern>...]
 
 DESCRIPTION
 -----------

@@ -47,6 +48,26 @@ OPTIONS
 	`xx`; for example `%00` interpolates to `\0` (NUL),
 	`%09` to `\t` (TAB) and `%0a` to `\n` (LF).
 
+<pretty>::
+	A format string with supporting placeholders described in the
+	"PRETTY FORMATS" section in linkgit:git-log[1].  Additionally
+	supports placeholders from `<format>`
+	(i.e. `%[*](fieldname)`).
++
+Caveats:
+
+1. Many of the placeholders in "PRETTY FORMATS" are designed to work
+   specifically on commit objects: when non-commit objects are
+   supplied, those placeholders won't work (i.e. they will be emitted
+   literally).
+
+2. Does not interpolate `%ab` (where `ab` are hex digits) with the
+   corresponding hex code.  To print a byte from a hex code, use
+   `%xab` (from pretty-formats) instead.
+
+3. Only the placeholders inherited from `<format>` will respect
+   quoting settings.
+
 <pattern>...::
 	If one or more patterns are given, only refs are shown that
 	match against at least one pattern, either using fnmatch(3) or

@@ -962,6 +962,63 @@ static void show_refs(struct refinfo **refs, int maxcount,
 	strbuf_release(&sb);
 }
 
+struct format_one_atom_context {
+	struct refinfo *info;
+	int quote_style;
+};
+
+static size_t format_one_atom(struct strbuf *sb, const char *placeholder,
+			      void *format_context, void *user_data,
+			      struct strbuf *subst)
+{
+	struct format_one_atom_context *ctx = user_data;
+	const char *ep;
+
+	if (*placeholder == '%') {
+		strbuf_addch(sb, '%');
+		return 1;
+	}
+
+	if (*placeholder != '(')
+		return 0;
+
+	ep = strchr(placeholder + 1, ')');
+	if (!ep)
+		return 0;
+	print_value(sb, ctx->info, parse_atom(placeholder + 1, ep),
+		    ctx->quote_style);
+	return ep + 1 - placeholder;
+}
+
+static void show_pretty_refs(struct refinfo **refs, int maxcount,
+			     const char *format, int quote_style)
+{
+	struct pretty_print_context ctx = {0};
+	struct format_one_atom_context fctx;
+	struct strbuf sb = STRBUF_INIT;
+	int i;
+
+	/*
+	 * FIXME: add --date= for %ad, --decorate for %d and --color
+	 * for %C
+	 */
+	ctx.abbrev = DEFAULT_ABBREV;
+	ctx.format = format_one_atom;
+	ctx.user_data = &fctx;
+	fctx.quote_style = quote_style;
+	for (i = 0; i < maxcount; i++) {
+		struct commit *commit = NULL;
+		fctx.info = refs[i];
+		if (sha1_object_info(refs[i]->objectname, NULL) == OBJ_COMMIT)
+			commit = lookup_commit(refs[i]->objectname);
+		strbuf_reset(&sb);
+		format_commit_message(commit, format, &sb, &ctx);
+		strbuf_addch(&sb, '\n');
+		fputs(sb.buf, stdout);
+	}
+	strbuf_release(&sb);
+}
+
 static struct ref_sort *default_sort(void)
 {
 	static const char cstr_name[] = "refname";

@@ -1003,7 +1060,9 @@ static char const * const for_each_ref_usage[] = {
 int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
 {
 	int num_refs;
-	const char *format = "%(objectname) %(objecttype)\t%(refname)";
+	const char *default_format = "%(objectname) %(objecttype)\t%(refname)";
+	const char *format = default_format;
+	const char *pretty = NULL;
 	struct ref_sort *sort = NULL, **sort_tail = &sort;
 	int maxcount = 0, quote_style = 0;
 	struct refinfo **refs;

@@ -1022,6 +1081,7 @@ int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
 		OPT_GROUP(""),
 		OPT_INTEGER( 0 , "count", &maxcount, N_("show only <n> matched refs")),
 		OPT_STRING(  0 , "format", &format, N_("format"), N_("format to use for the output")),
+		OPT_STRING(  0 , "pretty", &pretty, N_("format"), N_("alternative format to use for the output")),
 		OPT_CALLBACK(0 , "sort", sort_tail, N_("key"),
 			    N_("field name to sort on"), &opt_parse_sort),
 		OPT_END(),

@@ -1036,7 +1096,10 @@ int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
 		error("more than one quoting style?");
 		usage_with_options(for_each_ref_usage, opts);
 	}
-	if (verify_format(format))
+	if (format != default_format && pretty)
+		die("--format and --pretty cannot be used together");
+	if ((pretty && verify_format(pretty)) ||
+	    (!pretty && verify_format(format)))
 		usage_with_options(for_each_ref_usage, opts);
 
 	if (!sort)

@@ -1057,6 +1120,9 @@ int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
 	if (!maxcount || num_refs < maxcount)
 		maxcount = num_refs;
 
-	show_refs(refs, maxcount, format, quote_style);
+	if (pretty)
+		show_pretty_refs(refs, maxcount, pretty, quote_style);
+	else
+		show_refs(refs, maxcount, format, quote_style);
 	return 0;
 }

@@ -48,6 +48,20 @@ test_atom() {
 	"
 }
 
+test_pretty() {
+	case "$1" in
+		head) ref=refs/heads/master ;;
+		 tag) ref=refs/tags/testtag ;;
+		   *) ref=$1 ;;
+	esac
+	printf '%s\n' "$3" >expected
+	test_expect_${4:-success} $PREREQ "basic pretty: $1 $2" "
+		git for-each-ref --pretty='$2' $ref >actual &&
+		sanitize_pgp <actual >actual.clean &&
+		test_cmp expected actual.clean
+	"
+}
+
 test_atom head refname refs/heads/master
 test_atom head upstream refs/remotes/origin/master
 test_atom head objecttype commit

@@ -114,6 +128,115 @@ test_atom tag contents:signature ''
 test_atom tag contents 'Tagging at 1151939927
 '
 
+echo "Mailmap'd <map@example.com> <author@example.com>" > $HOME/.mailmap
+
+test_pretty head '%(refname)' refs/heads/master
+test_pretty head '%(upstream)' refs/remotes/origin/master
+test_pretty head '%(objecttype)' commit
+test_pretty head '%(objectsize)' 171
+test_pretty head '%(objectname)' 67a36f10722846e891fbada1ba48ed035de75581
+test_pretty head '%H' 67a36f10722846e891fbada1ba48ed035de75581
+test_pretty head '%h' 67a36f1
+test_pretty head '%(tree)' 0e51c00fcb93dffc755546f27593d511e1bdb46f
+test_pretty head '%T' 0e51c00fcb93dffc755546f27593d511e1bdb46f
+test_pretty head '%t' 0e51c00
+test_pretty head '%(parent)' ''
+test_pretty head '%P' ''
+test_pretty head '%(numparent)' 0
+test_pretty head '%(object)' ''
+test_pretty head '%(type)' ''
+test_pretty head '%(author)' 'A U Thor <author@example.com> 1151939924 +0200'
+test_pretty head '%(authorname)' 'A U Thor'
+test_pretty head '%an' 'A U Thor'
+test_pretty head '%aN' "Mailmap'd"
+test_pretty head '%(authoremail)' '<author@example.com>'
+test_pretty head '%ae' 'author@example.com'
+test_pretty head '%aE' 'map@example.com'
+test_pretty head '%(authordate)' 'Mon Jul 3 17:18:44 2006 +0200'
+test_pretty head '%aD' 'Mon, 3 Jul 2006 17:18:44 +0200'
+test_pretty head '%(committer)' 'C O Mitter <committer@example.com> 1151939923 +0200'
+test_pretty head '%(committername)' 'C O Mitter'
+test_pretty head '%cn' 'C O Mitter'
+test_pretty head '%(committeremail)' '<committer@example.com>'
+test_pretty head '%ce' 'committer@example.com'
+test_pretty head '%(committerdate)' 'Mon Jul 3 17:18:43 2006 +0200'
+test_pretty head '%cD' 'Mon, 3 Jul 2006 17:18:43 +0200'
+test_pretty head '%(tag)' ''
+test_pretty head '%(tagger)' ''
+test_pretty head '%(taggername)' ''
+test_pretty head '%(taggeremail)' ''
+test_pretty head '%(taggerdate)' ''
+test_pretty head '%(creator)' 'C O Mitter <committer@example.com> 1151939923 +0200'
+test_pretty head '%(creatordate)' 'Mon Jul 3 17:18:43 2006 +0200'
+test_pretty head '%(subject)' 'Initial'
+test_pretty head '%(contents:subject)' 'Initial'
+test_pretty head '%(body)' ''
+test_pretty head '%(contents:body)' ''
+test_pretty head '%(contents:signature)' ''
+test_pretty head '%(contents)' 'Initial
+'
+
+test_pretty head '%d' ' (HEAD, tag: testtag, origin/master, master)'
+test_pretty head '%x20' ' '
+test_pretty head '%g' '%g'
+test_pretty head '%unknown' '%unknown'
+test_pretty head '% (parent)' ''
+test_pretty head '% P' ''
+test_pretty head '% (tree)' ' 0e51c00fcb93dffc755546f27593d511e1bdb46f'
+test_pretty head '% T' ' 0e51c00fcb93dffc755546f27593d511e1bdb46f'
+
+test_expect_success '% (unknown)' '
+	test_must_fail git for-each-ref --pretty="% (unknown)" refs/heads/master
+'
+
+test_pretty head '%<(20)%cn end' 'C O Mitter           end'
+test_pretty head '%>(20)%cn end' '          C O Mitter end'
+test_pretty head '%><(20)%cn end' '     C O Mitter      end'
+test_pretty head '%<(20)%(committername) end' 'C O Mitter           end'
+test_pretty head '%>(20)%(committername) end' '          C O Mitter end'
+test_pretty head '%><(20)%(committername) end' '     C O Mitter      end'
+
+test_pretty tag '%(refname)' refs/tags/testtag
+test_pretty tag '%(upstream)' ''
+test_pretty tag '%(objecttype)' tag
+test_pretty tag '%(objectsize)' 154
+test_pretty tag '%(objectname)' 98b46b1d36e5b07909de1b3886224e3e81e87322
+test_pretty tag '%(tree)' ''
+test_pretty tag '%(parent)' ''
+test_pretty tag '%(numparent)' ''
+test_pretty tag '%(object)' '67a36f10722846e891fbada1ba48ed035de75581'
+test_pretty tag '%(type)' 'commit'
+test_pretty tag '%(author)' ''
+test_pretty tag '%(authorname)' ''
+test_pretty tag '%(authoremail)' ''
+test_pretty tag '%(authordate)' ''
+test_pretty tag '%(committer)' ''
+test_pretty tag '%(committername)' ''
+test_pretty tag '%(committeremail)' ''
+test_pretty tag '%(committerdate)' ''
+test_pretty tag '%(tag)' 'testtag'
+test_pretty tag '%(tagger)' 'C O Mitter <committer@example.com> 1151939925 +0200'
+test_pretty tag '%(taggername)' 'C O Mitter'
+test_pretty tag '%(taggeremail)' '<committer@example.com>'
+test_pretty tag '%(taggerdate)' 'Mon Jul 3 17:18:45 2006 +0200'
+test_pretty tag '%(creator)' 'C O Mitter <committer@example.com> 1151939925 +0200'
+test_pretty tag '%(creatordate)' 'Mon Jul 3 17:18:45 2006 +0200'
+test_pretty tag '%(subject)' 'Tagging at 1151939927'
+test_pretty tag '%(contents:subject)' 'Tagging at 1151939927'
+test_pretty tag '%(body)' ''
+test_pretty tag '%(contents:body)' ''
+test_pretty tag '%(contents:signature)' ''
+test_pretty tag '%(contents)' 'Tagging at 1151939927
+'
+
+# make sure we don't segfault when non-commits are passed in
+# format_commit_message. Should be fixed so that some of these
+# placeholders produce something useful for non-commits.
+test_pretty tag '%H' '%H'
+test_pretty tag '%h' '%h'
+test_pretty tag '%T' '%T'
+test_pretty tag '%t' '%t'
+
 test_expect_success 'Check invalid atoms names are errors' '
 	test_must_fail git for-each-ref --format="%(INVALID)" refs/heads
 '

@@ -150,7 +150,7 @@ static int parse_atom(const char *atom, const char *ep)
 /*
  * In a format string, find the next occurrence of %(atom).
  */
-static const char *find_next(const char *cp)
+static const char *find_next(const char *cp, int pretty)
 {
 	while (*cp) {
 		if (*cp == '%') {

@@ -160,6 +160,9 @@ static const char *find_next(const char *cp)
 			 */
 			if (cp[1] == '(')
 				return cp;
+			else if (pretty && cp[1] && cp[2] == '(' &&
+				 strchr(" +-", cp[1])) /* see format_commit_item() */
+				return cp + 1;
 			else if (cp[1] == '%')
 				cp++; /* skip over two % */
 			/* otherwise this is a singleton, literal % */

@@ -173,10 +176,10 @@ static const char *find_next(const char *cp)
  * Make sure the format string is well formed, and parse out
  * the used atoms.
  */
-static int verify_format(const char *format)
+static int verify_format(const char *format, int pretty)
 {
 	const char *cp, *sp;
-	for (cp = format; *cp && (sp = find_next(cp)); ) {
+	for (cp = format; *cp && (sp = find_next(cp, pretty)); ) {
 		const char *ep = strchr(sp, ')');
 		if (!ep)
 			return error("malformed format string %s", sp);

@@ -935,7 +938,7 @@ static void show_ref(struct strbuf *sb, struct refinfo *info,
 {
 	const char *cp, *sp, *ep;
 
-	for (cp = format; *cp && (sp = find_next(cp)); cp = ep + 1) {
+	for (cp = format; *cp && (sp = find_next(cp, 0)); cp = ep + 1) {
 		ep = strchr(sp, ')');
 		if (cp < sp)
 			emit(sb, cp, sp);

@@ -1098,8 +1101,8 @@ int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
 	}
 	if (format != default_format && pretty)
 		die("--format and --pretty cannot be used together");
-	if ((pretty && verify_format(pretty)) ||
-	    (!pretty && verify_format(format)))
+	if ((pretty && verify_format(pretty, 1)) ||
+	    (!pretty && verify_format(format, 0)))
 		usage_with_options(for_each_ref_usage, opts);
 
 	if (!sort)

@@ -1439,6 +1439,10 @@ static size_t format_commit_item(struct strbuf *sb, /* in UTF-8 */
 		ADD_SP_BEFORE_NON_EMPTY
 	} magic = NO_MAGIC;
 
+	/*
+	 * Note: any modification in what placeholder[0] contains
+	 * should be redone in builtin/for-each-ref.c:find_next().
+	 */
 	switch (placeholder[0]) {
 	case '-':
 		magic = DEL_LF_BEFORE_EMPTY;

@@ -60,6 +60,9 @@ calculated.
 +
 Caveats:
 
+0. No built-in formats from PRETTY FORMATS (like oneline, short) are
+   available.
+
 1. Many of the placeholders in "PRETTY FORMATS" are designed to work
    specifically on commit objects: when non-commit objects are
    supplied, those placeholders won't work (i.e. they will be emitted

@@ -1151,7 +1151,7 @@ int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
 	int num_refs;
 	const char *default_format = "%(objectname) %(objecttype)\t%(refname)";
 	const char *format = default_format;
-	const char *pretty = NULL;
+	const char *pretty_raw = NULL, *pretty_userformat = NULL;
 	struct ref_sort *sort = NULL, **sort_tail = &sort;
 	int maxcount = 0, quote_style = 0;
 	struct refinfo **refs;

@@ -1170,13 +1170,15 @@ int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
 		OPT_GROUP(""),
 		OPT_INTEGER( 0 , "count", &maxcount, N_("show only <n> matched refs")),
 		OPT_STRING(  0 , "format", &format, N_("format"), N_("format to use for the output")),
-		OPT_STRING(  0 , "pretty", &pretty, N_("format"), N_("alternative format to use for the output")),
+		OPT_STRING(  0 , "pretty", &pretty_raw, N_("format"), N_("alternative format to use for the output")),
 		OPT_CALLBACK(0 , "sort", sort_tail, N_("key"),
 			    N_("field name to sort on"), &opt_parse_sort),
 		OPT_END(),
 	};
 
 	parse_options(argc, argv, prefix, opts, for_each_ref_usage, 0);
+	if (pretty_raw)
+		pretty_userformat = get_pretty_userformat(pretty_raw);
 	if (maxcount < 0) {
 		error("invalid --count argument: `%d'", maxcount);
 		usage_with_options(for_each_ref_usage, opts);

@@ -1185,10 +1187,10 @@ int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
 		error("more than one quoting style?");
 		usage_with_options(for_each_ref_usage, opts);
 	}
-	if (format != default_format && pretty)
+	if (format != default_format && pretty_userformat)
 		die("--format and --pretty cannot be used together");
-	if ((pretty && verify_format(pretty, 1)) ||
-	    (!pretty && verify_format(format, 0)))
+	if ((pretty_userformat && verify_format(pretty_userformat, 1)) ||
+	    (!pretty_userformat && verify_format(format, 0)))
 		usage_with_options(for_each_ref_usage, opts);
 
 	if (!sort)

@@ -1209,8 +1211,8 @@ int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
 	if (!maxcount || num_refs < maxcount)
 		maxcount = num_refs;
 
-	if (pretty)
-		show_pretty_refs(refs, maxcount, pretty, quote_style);
+	if (pretty_userformat)
+		show_pretty_refs(refs, maxcount, pretty_userformat, quote_style);
 	else
 		show_refs(refs, maxcount, format, quote_style);
 	return 0;

@@ -121,6 +121,10 @@ upstream::
 	from the displayed ref. Respects `:short` in the same way as
 	`refname` above.
 
+HEAD::
+	Useful to indicate the currently checked out branch.  Is '*'
+	if HEAD points to the current ref, and ' ' otherwise.
+
 In addition to the above, for commit and tag objects, the header
 field names (`tree`, `parent`, `object`, `type`, and `tag`) can
 be used to specify the value in the header field.

@@ -76,6 +76,7 @@ static struct {
 	{ "upstream" },
 	{ "symref" },
 	{ "flag" },
+	{ "HEAD" },
 };
 
 /*

@@ -679,8 +680,16 @@ static void populate_value(struct refinfo *ref)
 				v->s = xstrdup(buf + 1);
 			}
 			continue;
-		}
-		else
+		} else if (!strcmp(name, "HEAD")) {
+			const char *head;
+			unsigned char sha1[20];
+			head = resolve_ref_unsafe("HEAD", sha1, 1, NULL);
+			if (!strcmp(ref->refname, head))
+				v->s = "*";
+			else
+				v->s = " ";
+			continue;
+		} else
 			continue;
 
 		formatp = strchr(name, ':');

@@ -565,20 +565,6 @@ static void grab_sub_body_contents(struct atom_value *val, int deref, struct obj
 }
 
 /*
- * We want to have empty print-string for field requests
- * that do not apply (e.g. "authordate" for a tag object)
- */
-static void fill_missing_values(struct atom_value *val)
-{
-	int i;
-	for (i = 0; i < used_atom_cnt; i++) {
-		struct atom_value *v = &val[i];
-		if (v->s == NULL)
-			v->s = "";
-	}
-}
-
-/*
  * val is a list of atom_value to hold returned values.  Extract
  * the values for atoms in used_atom array out of (obj, buf, sz).
  * when deref is false, (obj, buf, sz) is the object that is