Retire diff-helper.

The textual diff generation with built-in '-p' in diff-* brothers has
proven to be useful enough that git-diff-helper outlived its usefulness.

Signed-off-by: Junio C Hamano <junkio@cox.net>

11 files changed, 2 insertions, 415 deletions

diff --git a/.gitignore b/.gitignore
index 0a876865c0..e8ae8c352b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,7 +20,6 @@ git-cvsimport
 git-daemon
 git-diff
 git-diff-files
-git-diff-helper
 git-diff-index
 git-diff-stages
 git-diff-tree
diff --git a/Documentation/diff-format.txt b/Documentation/diff-format.txt
index 424e75a1c2..6e9fa8cdb7 100644
--- a/Documentation/diff-format.txt
+++ b/Documentation/diff-format.txt
@@ -62,8 +62,7 @@ When "git-diff-index", "git-diff-tree", or "git-diff-files" are run
 with a '-p' option, they do not produce the output described above;
 instead they produce a patch file.
 
-The patch generation can be customized at two levels.  This
-customization also applies to "git-diff-helper".
+The patch generation can be customized at two levels.
 
 1. When the environment variable 'GIT_EXTERNAL_DIFF' is not set,
    these commands internally invoke "diff" like this:
diff --git a/Documentation/git-diff-helper.txt b/Documentation/git-diff-helper.txt
deleted file mode 100644
index 047e39272f..0000000000
--- a/Documentation/git-diff-helper.txt
+++ /dev/null
@@ -1,53 +0,0 @@
-git-diff-helper(1)
-==================
-v0.1, May 2005
-
-NAME
-----
-git-diff-helper - Generates patch format output for git-diff-*
-
-
-SYNOPSIS
---------
-'git-diff-helper' [-z] [-S<string>] [-O<orderfile>]
-
-DESCRIPTION
------------
-Reads output from "git-diff-index", "git-diff-tree" and "git-diff-files" and
-generates patch format output.
-
-OPTIONS
--------
--z::
-	\0 line termination on input
-
--S<string>::
-	Look for differences that contains the change in <string>.
-
---pickaxe-all::
-	When -S finds a change, show all the changes in that
-	changeset, not just the files that contains the change
-	in <string>.
-
--O<orderfile>::
-	Output the patch in the order specified in the
-	<orderfile>, which has one shell glob pattern per line.
-
-See Also
---------
-The section on generating patches in gitlink:git-diff-index[1]
-
-
-Author
-------
-Written by Junio C Hamano <junkio@cox.net>
-
-
-Documentation
---------------
-Documentation by David Greaves, Junio C Hamano and the git-list <git@vger.kernel.org>.
-
-GIT
----
-Part of the gitlink:git[7] suite
-
diff --git a/Documentation/git.txt b/Documentation/git.txt
index 2684fa9393..e141021279 100644
--- a/Documentation/git.txt
+++ b/Documentation/git.txt
@@ -363,9 +363,6 @@ gitlink:git-count-objects[1]::
 gitlink:git-daemon[1]::
 	A really simple server for GIT repositories.
 
-gitlink:git-diff-helper[1]::
-	Generates patch format output for git-diff-*
-
 gitlink:git-get-tar-commit-id[1]::
 	Extract commit ID from an archive created using git-tar-tree.
 
diff --git a/Makefile b/Makefile
index 1b805b0047..f9ecbef6cb 100644
--- a/Makefile
+++ b/Makefile
@@ -102,7 +102,7 @@ PROGRAMS = \
 	git-apply git-cat-file \
 	git-checkout-index git-clone-pack git-commit-tree \
 	git-convert-objects git-diff-files \
-	git-diff-helper git-diff-index git-diff-stages \
+	git-diff-index git-diff-stages \
 	git-diff-tree git-fetch-pack git-fsck-objects \
 	git-hash-object git-init-db \
 	git-local-fetch git-ls-files git-ls-tree git-merge-base \
diff --git a/diff-helper.c b/diff-helper.c
deleted file mode 100644
index 734956e4da..0000000000
--- a/diff-helper.c
+++ /dev/null
@@ -1,154 +0,0 @@
-/*
- * Copyright (C) 2005 Junio C Hamano
- */
-#include "cache.h"
-#include "strbuf.h"
-#include "diff.h"
-
-static const char *pickaxe = NULL;
-static int pickaxe_opts = 0;
-static const char *orderfile = NULL;
-static const char *diff_filter = NULL;
-static int line_termination = '\n';
-static int inter_name_termination = '\t';
-
-static void flush_them(int ac, const char **av)
-{
-	diffcore_std_no_resolve(av + 1,
-				pickaxe, pickaxe_opts,
-				orderfile, diff_filter);
-	diff_flush(DIFF_FORMAT_PATCH, '\n');
-}
-
-static const char diff_helper_usage[] =
-"git-diff-helper [-z] [-O<orderfile>] [-S<string>] [--pickaxe-all] [<path>...]";
-
-int main(int ac, const char **av) {
-	struct strbuf sb;
-	const char *garbage_flush_format;
-
-	strbuf_init(&sb);
-
-	while (1 < ac && av[1][0] == '-') {
-		if (av[1][1] == 'z')
-			line_termination = inter_name_termination = 0;
-		else if (av[1][1] == 'S') {
-			pickaxe = av[1] + 2;
-		}
-		else if (!strcmp(av[1], "--pickaxe-all"))
-			pickaxe_opts = DIFF_PICKAXE_ALL;
-		else if (!strncmp(av[1], "--diff-filter=", 14))
-			diff_filter = av[1] + 14;
-		else if (!strncmp(av[1], "-O", 2))
-			orderfile = av[1] + 2;
-		else
-			usage(diff_helper_usage);
-		ac--; av++;
-	}
-	garbage_flush_format = (line_termination == 0) ? "%s" : "%s\n";
-
-	/* the remaining parameters are paths patterns */
-
-	diff_setup(0);
-	while (1) {
-		unsigned old_mode, new_mode;
-		unsigned char old_sha1[20], new_sha1[20];
-		char old_path[PATH_MAX];
-		int status, score, two_paths;
-		char new_path[PATH_MAX];
-
-		int ch;
-		char *cp, *ep;
-
-		read_line(&sb, stdin, line_termination);
-		if (sb.eof)
-			break;
-		switch (sb.buf[0]) {
-		case ':':
-			/* parse the first part up to the status */
-			cp = sb.buf + 1;
-			old_mode = new_mode = 0;
-			while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
-				old_mode = (old_mode << 3) | (ch - '0');
-				cp++;
-			}
-			if (*cp++ != ' ')
-				break;
-			while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
-				new_mode = (new_mode << 3) | (ch - '0');
-				cp++;
-			}
-			if (*cp++ != ' ')
-				break;
-			if (get_sha1_hex(cp, old_sha1))
-				break;
-			cp += 40;
-			if (*cp++ != ' ')
-				break;
-			if (get_sha1_hex(cp, new_sha1))
-				break;
-			cp += 40;
-			if (*cp++ != ' ')
-				break;
-			status = *cp++;
-			if (!strchr("AMCRDU", status))
-				break;
-			two_paths = score = 0;
-			if (status == DIFF_STATUS_RENAMED ||
-			    status == DIFF_STATUS_COPIED)
-				two_paths = 1;
-
-			/* pick up score if exists */
-			if (sscanf(cp, "%d", &score) != 1)
-				score = 0;
-			cp = strchr(cp,
-				    inter_name_termination);
-			if (!cp)
-				break;
-			if (*cp++ != inter_name_termination)
-				break;
-
-			/* first pathname */
-			if (!line_termination) {
-				read_line(&sb, stdin, line_termination);
-				if (sb.eof)
-					break;
-				strcpy(old_path, sb.buf);
-			}
-			else if (!two_paths)
-				strcpy(old_path, cp);
-			else {
-				ep = strchr(cp, inter_name_termination);
-				if (!ep)
-					break;
-				strncpy(old_path, cp, ep-cp);
-				old_path[ep-cp] = 0;
-				cp = ep + 1;
-			}
-
-			/* second pathname */
-			if (!two_paths)
-				strcpy(new_path, old_path);
-			else {
-				if (!line_termination) {
-					read_line(&sb, stdin,
-						  line_termination);
-					if (sb.eof)
-						break;
-					strcpy(new_path, sb.buf);
-				}
-				else
-					strcpy(new_path, cp);
-			}
-			diff_helper_input(old_mode, new_mode,
-					  old_sha1, new_sha1,
-					  old_path, status, score,
-					  new_path);
-			continue;
-		}
-		flush_them(ac, av);
-		printf(garbage_flush_format, sb.buf);
-	}
-	flush_them(ac, av);
-	return 0;
-}
diff --git a/diff.c b/diff.c
index d8d20c2fcb..3dc0ca0a03 100644
--- a/diff.c
+++ b/diff.c
@@ -1152,29 +1152,6 @@ void diff_addremove(int addremove, unsigned mode,
 	diff_queue(&diff_queued_diff, one, two);
 }
 
-void diff_helper_input(unsigned old_mode,
-		       unsigned new_mode,
-		       const unsigned char *old_sha1,
-		       const unsigned char *new_sha1,
-		       const char *old_path,
-		       int status,
-		       int score,
-		       const char *new_path)
-{
-	struct diff_filespec *one, *two;
-	struct diff_filepair *dp;
-
-	one = alloc_filespec(old_path);
-	two = alloc_filespec(new_path);
-	if (old_mode)
-		fill_filespec(one, old_sha1, old_mode);
-	if (new_mode)
-		fill_filespec(two, new_sha1, new_mode);
-	dp = diff_queue(&diff_queued_diff, one, two);
-	dp->score = score * MAX_SCORE / 100;
-	dp->status = status;
-}
-
 void diff_change(unsigned old_mode, unsigned new_mode,
 		 const unsigned char *old_sha1,
 		 const unsigned char *new_sha1,
diff --git a/diff.h b/diff.h
index 3deb7fa4e8..96c2312d86 100644
--- a/diff.h
+++ b/diff.h
@@ -19,15 +19,6 @@ extern void diff_change(unsigned mode1, unsigned mode2,
 			     const unsigned char *sha2,
 			     const char *base, const char *path);
 
-extern void diff_helper_input(unsigned mode1,
-			      unsigned mode2,
-			      const unsigned char *sha1,
-			      const unsigned char *sha2,
-			      const char *path1,
-			      int status,
-			      int score,
-			      const char *path2);
-
 extern void diff_unmerge(const char *path);
 
 extern int diff_scoreopt_parse(const char *opt);
diff --git a/t/t4000-diff-format.sh b/t/t4000-diff-format.sh
index 91015d76fc..f3b6330a9b 100755
--- a/t/t4000-diff-format.sh
+++ b/t/t4000-diff-format.sh
@@ -50,13 +50,4 @@ test_expect_success \
     'validate git-diff-files -p output.' \
     'cmp -s current expected'
 
-test_expect_success \
-    'build same diff using git-diff-helper.' \
-    'git-diff-files -z | git-diff-helper -z >current'
-
-
-test_expect_success \
-    'validate git-diff-helper output.' \
-    'cmp -s current expected'
-
 test_done
diff --git a/t/t4005-diff-rename-2.sh b/t/t4005-diff-rename-2.sh
index 5636f4f2cd..684fd23a41 100755
--- a/t/t4005-diff-rename-2.sh
+++ b/t/t4005-diff-rename-2.sh
@@ -40,38 +40,6 @@ test_expect_success \
     'validate output from rename/copy detection (#1)' \
     'compare_diff_raw current expected'
 
-# make sure diff-helper can grok it.
-mv expected diff-raw
-GIT_DIFF_OPTS=--unified=0 git-diff-helper <diff-raw >current
-cat >expected <<\EOF
-diff --git a/COPYING b/COPYING.1
-copy from COPYING
-copy to COPYING.1
---- a/COPYING
-+++ b/COPYING.1
-@@ -6 +6 @@
-- HOWEVER, in order to allow a migration to GPLv3 if that seems like
-+ However, in order to allow a migration to GPLv3 if that seems like
-diff --git a/COPYING b/COPYING.2
-rename from COPYING
-rename to COPYING.2
---- a/COPYING
-+++ b/COPYING.2
-@@ -2 +2 @@
-- Note that the only valid version of the GPL as far as this project
-+ Note that the only valid version of the G.P.L as far as this project
-@@ -6 +6 @@
-- HOWEVER, in order to allow a migration to GPLv3 if that seems like
-+ HOWEVER, in order to allow a migration to G.P.Lv3 if that seems like
-@@ -12 +12 @@
--	This file is licensed under the GPL v2, or a later version
-+	This file is licensed under the G.P.L v2, or a later version
-EOF
-
-test_expect_success \
-    'validate output from diff-helper (#1)' \
-    'compare_diff_patch current expected'
-
 ################################################################
 
 test_expect_success \
@@ -94,36 +62,6 @@ test_expect_success \
     'validate output from rename/copy detection (#2)' \
     'compare_diff_raw current expected'
 
-# make sure diff-helper can grok it.
-mv expected diff-raw
-GIT_DIFF_OPTS=--unified=0 git-diff-helper <diff-raw >current
-cat >expected <<\EOF
-diff --git a/COPYING b/COPYING
---- a/COPYING
-+++ b/COPYING
-@@ -2 +2 @@
-- Note that the only valid version of the GPL as far as this project
-+ Note that the only valid version of the G.P.L as far as this project
-@@ -6 +6 @@
-- HOWEVER, in order to allow a migration to GPLv3 if that seems like
-+ HOWEVER, in order to allow a migration to G.P.Lv3 if that seems like
-@@ -12 +12 @@
--	This file is licensed under the GPL v2, or a later version
-+	This file is licensed under the G.P.L v2, or a later version
-diff --git a/COPYING b/COPYING.1
-copy from COPYING
-copy to COPYING.1
---- a/COPYING
-+++ b/COPYING.1
-@@ -6 +6 @@
-- HOWEVER, in order to allow a migration to GPLv3 if that seems like
-+ However, in order to allow a migration to GPLv3 if that seems like
-EOF
-
-test_expect_success \
-    'validate output from diff-helper (#2)' \
-    'compare_diff_patch current expected'
-
 ################################################################
 
 # tree has COPYING and rezrov.  work tree has the same COPYING and
@@ -145,22 +83,4 @@ test_expect_success \
     'validate output from rename/copy detection (#3)' \
     'compare_diff_raw current expected'
 
-# make sure diff-helper can grok it.
-mv expected diff-raw
-GIT_DIFF_OPTS=--unified=0 git-diff-helper <diff-raw >current
-cat >expected <<\EOF
-diff --git a/COPYING b/COPYING.1
-copy from COPYING
-copy to COPYING.1
---- a/COPYING
-+++ b/COPYING.1
-@@ -6 +6 @@
-- HOWEVER, in order to allow a migration to GPLv3 if that seems like
-+ However, in order to allow a migration to GPLv3 if that seems like
-EOF
-
-test_expect_success \
-    'validate output from diff-helper (#3)' \
-    'compare_diff_patch current expected'
-
 test_done
diff --git a/t/t4009-diff-rename-4.sh b/t/t4009-diff-rename-4.sh
index ea811529cc..2f2f8b1216 100755
--- a/t/t4009-diff-rename-4.sh
+++ b/t/t4009-diff-rename-4.sh
@@ -44,38 +44,6 @@ test_expect_success \
     'validate output from rename/copy detection (#1)' \
     'compare_diff_raw_z current expected'
 
-# make sure diff-helper can grok it.
-mv current diff-raw
-GIT_DIFF_OPTS=--unified=0 git-diff-helper -z <diff-raw >current
-cat >expected <<\EOF
-diff --git a/COPYING b/COPYING.1
-copy from COPYING
-copy to COPYING.1
---- a/COPYING
-+++ b/COPYING.1
-@@ -6 +6 @@
-- HOWEVER, in order to allow a migration to GPLv3 if that seems like
-+ However, in order to allow a migration to GPLv3 if that seems like
-diff --git a/COPYING b/COPYING.2
-rename from COPYING
-rename to COPYING.2
---- a/COPYING
-+++ b/COPYING.2
-@@ -2 +2 @@
-- Note that the only valid version of the GPL as far as this project
-+ Note that the only valid version of the G.P.L as far as this project
-@@ -6 +6 @@
-- HOWEVER, in order to allow a migration to GPLv3 if that seems like
-+ HOWEVER, in order to allow a migration to G.P.Lv3 if that seems like
-@@ -12 +12 @@
--	This file is licensed under the GPL v2, or a later version
-+	This file is licensed under the G.P.L v2, or a later version
-EOF
-
-test_expect_success \
-    'validate output from diff-helper (#1)' \
-    'compare_diff_patch current expected'
-
 ################################################################
 
 test_expect_success \
@@ -101,36 +69,6 @@ test_expect_success \
     'validate output from rename/copy detection (#2)' \
     'compare_diff_raw_z current expected'
 
-# make sure diff-helper can grok it.
-mv current diff-raw
-GIT_DIFF_OPTS=--unified=0 git-diff-helper -z <diff-raw >current
-cat >expected <<\EOF
-diff --git a/COPYING b/COPYING
---- a/COPYING
-+++ b/COPYING
-@@ -2 +2 @@
-- Note that the only valid version of the GPL as far as this project
-+ Note that the only valid version of the G.P.L as far as this project
-@@ -6 +6 @@
-- HOWEVER, in order to allow a migration to GPLv3 if that seems like
-+ HOWEVER, in order to allow a migration to G.P.Lv3 if that seems like
-@@ -12 +12 @@
--	This file is licensed under the GPL v2, or a later version
-+	This file is licensed under the G.P.L v2, or a later version
-diff --git a/COPYING b/COPYING.1
-copy from COPYING
-copy to COPYING.1
---- a/COPYING
-+++ b/COPYING.1
-@@ -6 +6 @@
-- HOWEVER, in order to allow a migration to GPLv3 if that seems like
-+ However, in order to allow a migration to GPLv3 if that seems like
-EOF
-
-test_expect_success \
-    'validate output from diff-helper (#2)' \
-    'compare_diff_patch current expected'
-
 ################################################################
 
 # tree has COPYING and rezrov.  work tree has the same COPYING and
@@ -154,22 +92,4 @@ test_expect_success \
     'validate output from rename/copy detection (#3)' \
     'compare_diff_raw_z current expected'
 
-# make sure diff-helper can grok it.
-mv current diff-raw
-GIT_DIFF_OPTS=--unified=0 git-diff-helper -z <diff-raw >current
-cat >expected <<\EOF
-diff --git a/COPYING b/COPYING.1
-copy from COPYING
-copy to COPYING.1
---- a/COPYING
-+++ b/COPYING.1
-@@ -6 +6 @@
-- HOWEVER, in order to allow a migration to GPLv3 if that seems like
-+ However, in order to allow a migration to GPLv3 if that seems like
-EOF
-
-test_expect_success \
-    'validate output from diff-helper (#3)' \
-    'compare_diff_patch current expected'
-
 test_done