[PATCH 4/4] pretty-print: add --pretty=noexpand

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

It is reasonable for tweak the default output mode for "git log" to
untabify the commit log message, it sometimes may be necessary to
see the output without tab expansion.

Invent a new --pretty option to do this.  Use this to unbreak the
test breakages, where "git shortlog" and output are tested.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 Documentation/pretty-formats.txt | 10 ++++++++++
 Documentation/pretty-options.txt |  2 +-
 commit.h                         |  1 +
 pretty.c                         | 12 +++++++++---
 t/t4201-shortlog.sh              |  6 +++---
 5 files changed, 24 insertions(+), 7 deletions(-)

diff --git a/Documentation/pretty-formats.txt b/Documentation/pretty-formats.txt
index 671cebd..173b932 100644
--- a/Documentation/pretty-formats.txt
+++ b/Documentation/pretty-formats.txt
@@ -39,6 +39,16 @@ This is designed to be as compact as possible.
 
 	      <title line>
 
+	      <full commit message, tab-expanded>
+
+* 'noexpand'
+
+	  commit <sha1>
+	  Author: <author>
+	  Date:   <author date>
+
+	      <title line>
+
 	      <full commit message>
 
 * 'full'
diff --git a/Documentation/pretty-options.txt b/Documentation/pretty-options.txt
index 4b659ac..7032b1a 100644
--- a/Documentation/pretty-options.txt
+++ b/Documentation/pretty-options.txt
@@ -3,7 +3,7 @@
 
 	Pretty-print the contents of the commit logs in a given format,
 	where '<format>' can be one of 'oneline', 'short', 'medium',
-	'full', 'fuller', 'email', 'raw', 'format:<string>'
+	'full', 'fuller', 'email', 'raw', 'noexpand', 'format:<string>'
 	and 'tformat:<string>'.  When '<format>' is none of the above,
 	and has '%placeholder' in it, it acts as if
 	'--pretty=tformat:<format>' were given.
diff --git a/commit.h b/commit.h
index 5d58be0..d511c61 100644
--- a/commit.h
+++ b/commit.h
@@ -126,6 +126,7 @@ enum cmit_fmt {
 	CMIT_FMT_RAW,
 	CMIT_FMT_MEDIUM,
 	CMIT_FMT_DEFAULT = CMIT_FMT_MEDIUM,
+	CMIT_FMT_NOEXPAND,
 	CMIT_FMT_SHORT,
 	CMIT_FMT_FULL,
 	CMIT_FMT_FULLER,
diff --git a/pretty.c b/pretty.c
index 717ceed..8b533dc 100644
--- a/pretty.c
+++ b/pretty.c
@@ -89,6 +89,7 @@ static void setup_commit_formats(void)
 	struct cmt_fmt_map builtin_formats[] = {
 		{ "raw",	CMIT_FMT_RAW,		0 },
 		{ "medium",	CMIT_FMT_MEDIUM,	0 },
+		{ "noexpand",	CMIT_FMT_NOEXPAND,	0 },
 		{ "short",	CMIT_FMT_SHORT,		0 },
 		{ "email",	CMIT_FMT_EMAIL,		0 },
 		{ "fuller",	CMIT_FMT_FULLER,	0 },
@@ -1685,11 +1686,16 @@ static void strbuf_add_tabexpand(struct strbuf *sb,
  * the whole line (without the final newline), after
  * de-tabifying.
  */
-static void pp_handle_indent(struct strbuf *sb, int indent,
+static void pp_handle_indent(struct pretty_print_context *pp,
+			     struct strbuf *sb,
+			     int indent,
 			     const char *line, int linelen)
 {
 	strbuf_addchars(sb, ' ', indent);
-	strbuf_add_tabexpand(sb, line, linelen);
+	if (pp->fmt == CMIT_FMT_MEDIUM)
+		strbuf_add_tabexpand(sb, line, linelen);
+	else
+		strbuf_add(sb, line, linelen);
 }
 
 void pp_remainder(struct pretty_print_context *pp,
@@ -1716,7 +1722,7 @@ void pp_remainder(struct pretty_print_context *pp,
 
 		strbuf_grow(sb, linelen + indent + 20);
 		if (indent)
-			pp_handle_indent(sb, indent, line, linelen);
+			pp_handle_indent(pp, sb, indent, line, linelen);
 		else
 			strbuf_add(sb, line, linelen);
 		strbuf_addch(sb, '\n');
diff --git a/t/t4201-shortlog.sh b/t/t4201-shortlog.sh
index 987b708..34a9fed 100755
--- a/t/t4201-shortlog.sh
+++ b/t/t4201-shortlog.sh
@@ -93,7 +93,7 @@ test_expect_success 'output from user-defined format is re-wrapped' '
 	test_cmp expect log.predictable
 '
 
-test_expect_failure !MINGW 'shortlog wrapping' '
+test_expect_success !MINGW 'shortlog wrapping' '
 	cat >expect <<\EOF &&
 A U Thor (5):
       Test
@@ -114,8 +114,8 @@ EOF
 	test_cmp expect out
 '
 
-test_expect_failure !MINGW 'shortlog from non-git directory' '
-	git log HEAD >log &&
+test_expect_success !MINGW 'shortlog from non-git directory' '
+	git log --pretty=noexpand HEAD >log &&
 	GIT_DIR=non-existing git shortlog -w <log >out &&
 	test_cmp expect out
 '
-- 
2.8.0-rc3-175-g64dcf62