diff-no-index.c - jrn/git - Git at Google

 /*
  * "diff --no-index" support
  * Copyright (c) 2007 by Johannes Schindelin
  * Copyright (c) 2008 by Junio C Hamano
  */

 #include "cache.h"
 #include "color.h"
 #include "commit.h"
 #include "blob.h"
 #include "tag.h"
 #include "diff.h"
 #include "diffcore.h"
 #include "revision.h"
 #include "log-tree.h"
 #include "builtin.h"
 #include "string-list.h"
 #include "dir.h"

 static int read_directory_contents(const char *path, struct string_list *list)
 {
 	DIR *dir;
 	struct dirent *e;

 	if (!(dir = opendir(path)))
 		return error("Could not open directory %s", path);

 	while ((e = readdir(dir)))
 		if (!is_dot_or_dotdot(e->d_name))
 			string_list_insert(list, e->d_name);

 	closedir(dir);
 	return 0;
 }

 /*
  * This should be "(standard input)" or something, but it will
  * probably expose many more breakages in the way no-index code
  * is bolted onto the diff callchain.
  */
 static const char file_from_standard_input[] = "-";

 static int get_mode(const char *path, int *mode)
 {
 	struct stat st;

 	if (!path || !strcmp(path, "/dev/null"))
 		*mode = 0;
 #ifdef GIT_WINDOWS_NATIVE
 	else if (!strcasecmp(path, "nul"))
 		*mode = 0;
 #endif
 	else if (path == file_from_standard_input)
 		*mode = create_ce_mode(0666);
 	else if (lstat(path, &st))
 		return error("Could not access '%s'", path);
 	else
 		*mode = st.st_mode;
 	return 0;
 }

 static int populate_from_stdin(struct diff_filespec *s)
 {
 	struct strbuf buf = STRBUF_INIT;
 	size_t size = 0;

 	if (strbuf_read(&buf, 0, 0) < 0)
 		return error("error while reading from stdin %s",
 				     strerror(errno));

 	s->should_munmap = 0;
 	s->data = strbuf_detach(&buf, &size);
 	s->size = size;
 	s->should_free = 1;
 	s->is_stdin = 1;
 	return 0;
 }

 static struct diff_filespec *noindex_filespec(const char *name, int mode)
 {
 	struct diff_filespec *s;

 	if (!name)
 		name = "/dev/null";
 	s = alloc_filespec(name);
 	fill_filespec(s, null_sha1, 0, mode);
 	if (name == file_from_standard_input)
 		populate_from_stdin(s);
 	return s;
 }

 static int queue_diff(struct diff_options *o,
 		      const char *name1, const char *name2)
 {
 	int mode1 = 0, mode2 = 0;

 	if (get_mode(name1, &mode1) || get_mode(name2, &mode2))
 		return -1;

 	if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2)) {
 		struct diff_filespec *d1, *d2;

 		if (S_ISDIR(mode1)) {
 			/* 2 is file that is created */
 			d1 = noindex_filespec(NULL, 0);
 			d2 = noindex_filespec(name2, mode2);
 			name2 = NULL;
 			mode2 = 0;
 		} else {
 			/* 1 is file that is deleted */
 			d1 = noindex_filespec(name1, mode1);
 			d2 = noindex_filespec(NULL, 0);
 			name1 = NULL;
 			mode1 = 0;
 		}
 		/* emit that file */
 		diff_queue(&diff_queued_diff, d1, d2);

 		/* and then let the entire directory be created or deleted */
 	}

 	if (S_ISDIR(mode1) || S_ISDIR(mode2)) {
 		struct strbuf buffer1 = STRBUF_INIT;
 		struct strbuf buffer2 = STRBUF_INIT;
 		struct string_list p1 = STRING_LIST_INIT_DUP;
 		struct string_list p2 = STRING_LIST_INIT_DUP;
 		int i1, i2, ret = 0;
 		size_t len1 = 0, len2 = 0;

 		if (name1 && read_directory_contents(name1, &p1))
 			return -1;
 		if (name2 && read_directory_contents(name2, &p2)) {
 			string_list_clear(&p1, 0);
 			return -1;
 		}

 		if (name1) {
 			strbuf_addstr(&buffer1, name1);
 			if (buffer1.len && buffer1.buf[buffer1.len - 1] != '/')
 				strbuf_addch(&buffer1, '/');
 			len1 = buffer1.len;
 		}

 		if (name2) {
 			strbuf_addstr(&buffer2, name2);
 			if (buffer2.len && buffer2.buf[buffer2.len - 1] != '/')
 				strbuf_addch(&buffer2, '/');
 			len2 = buffer2.len;
 		}

 		for (i1 = i2 = 0; !ret && (i1 < p1.nr || i2 < p2.nr); ) {
 			const char *n1, *n2;
 			int comp;

 			strbuf_setlen(&buffer1, len1);
 			strbuf_setlen(&buffer2, len2);

 			if (i1 == p1.nr)
 				comp = 1;
 			else if (i2 == p2.nr)
 				comp = -1;
 			else
 				comp = strcmp(p1.items[i1].string, p2.items[i2].string);

 			if (comp > 0)
 				n1 = NULL;
 			else {
 				strbuf_addstr(&buffer1, p1.items[i1++].string);
 				n1 = buffer1.buf;
 			}

 			if (comp < 0)
 				n2 = NULL;
 			else {
 				strbuf_addstr(&buffer2, p2.items[i2++].string);
 				n2 = buffer2.buf;
 			}

 			ret = queue_diff(o, n1, n2);
 		}
 		string_list_clear(&p1, 0);
 		string_list_clear(&p2, 0);
 		strbuf_release(&buffer1);
 		strbuf_release(&buffer2);

 		return ret;
 	} else {
 		struct diff_filespec *d1, *d2;

 		if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
 			unsigned tmp;
 			const char *tmp_c;
 			tmp = mode1; mode1 = mode2; mode2 = tmp;
 			tmp_c = name1; name1 = name2; name2 = tmp_c;
 		}

 		d1 = noindex_filespec(name1, mode1);
 		d2 = noindex_filespec(name2, mode2);
 		diff_queue(&diff_queued_diff, d1, d2);
 		return 0;
 	}
 }

 /* append basename of F to D */
 static void append_basename(struct strbuf *path, const char *dir, const char *file)
 {
 	const char *tail = strrchr(file, '/');

 	strbuf_addstr(path, dir);
 	while (path->len && path->buf[path->len - 1] == '/')
 		path->len--;
 	strbuf_addch(path, '/');
 	strbuf_addstr(path, tail ? tail + 1 : file);
 }

 /*
  * DWIM "diff D F" into "diff D/F F" and "diff F D" into "diff F D/F"
  * Note that we append the basename of F to D/, so "diff a/b/file D"
  * becomes "diff a/b/file D/file", not "diff a/b/file D/a/b/file".
  */
 static void fixup_paths(const char **path, struct strbuf *replacement)
 {
 	unsigned int isdir0, isdir1;

 	if (path[0] == file_from_standard_input ||
 	    path[1] == file_from_standard_input)
 		return;
 	isdir0 = is_directory(path[0]);
 	isdir1 = is_directory(path[1]);
 	if (isdir0 == isdir1)
 		return;
 	if (isdir0) {
 		append_basename(replacement, path[0], path[1]);
 		path[0] = replacement->buf;
 	} else {
 		append_basename(replacement, path[1], path[0]);
 		path[1] = replacement->buf;
 	}
 }

 void diff_no_index(struct rev_info *revs,
 		   int argc, const char **argv,
 		   const char *prefix)
 {
 	int i, prefixlen;
 	const char *paths[2];
 	struct strbuf replacement = STRBUF_INIT;

 	diff_setup(&revs->diffopt);
 	for (i = 1; i < argc - 2; ) {
 		int j;
 		if (!strcmp(argv[i], "--no-index"))
 			i++;
 		else if (!strcmp(argv[i], "--"))
 			i++;
 		else {
 			j = diff_opt_parse(&revs->diffopt, argv + i, argc - i);
 			if (j <= 0)
 				die("invalid diff option/value: %s", argv[i]);
 			i += j;
 		}
 	}

 	prefixlen = prefix ? strlen(prefix) : 0;
 	for (i = 0; i < 2; i++) {
 		const char *p = argv[argc - 2 + i];
 		if (!strcmp(p, "-"))
 			/*
 			 * stdin should be spelled as "-"; if you have
 			 * path that is "-", spell it as "./-".
 			 */
 			p = file_from_standard_input;
 		else if (prefixlen)
 			p = xstrdup(prefix_filename(prefix, prefixlen, p));
 		paths[i] = p;
 	}

 	fixup_paths(paths, &replacement);

 	revs->diffopt.skip_stat_unmatch = 1;
 	if (!revs->diffopt.output_format)
 		revs->diffopt.output_format = DIFF_FORMAT_PATCH;

 	DIFF_OPT_SET(&revs->diffopt, NO_INDEX);

 	revs->max_count = -2;
 	diff_setup_done(&revs->diffopt);

 	setup_diff_pager(&revs->diffopt);
 	DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);

 	if (queue_diff(&revs->diffopt, paths[0], paths[1]))
 		exit(1);
 	diff_set_mnemonic_prefix(&revs->diffopt, "1/", "2/");
 	diffcore_std(&revs->diffopt);
 	diff_flush(&revs->diffopt);

 	strbuf_release(&replacement);

 	/*
 	 * The return code for --no-index imitates diff(1):
 	 * 0 = no changes, 1 = changes, else error
 	 */
 	exit(diff_result_code(&revs->diffopt, 0));
 }
	/*
	* "diff --no-index" support
	* Copyright (c) 2007 by Johannes Schindelin
	* Copyright (c) 2008 by Junio C Hamano
	*/

	#include "cache.h"
	#include "color.h"
	#include "commit.h"
	#include "blob.h"
	#include "tag.h"
	#include "diff.h"
	#include "diffcore.h"
	#include "revision.h"
	#include "log-tree.h"
	#include "builtin.h"
	#include "string-list.h"
	#include "dir.h"

	static int read_directory_contents(const char path, struct string_list list)
	{
	DIR *dir;
	struct dirent *e;

	if (!(dir = opendir(path)))
	return error("Could not open directory %s", path);

	while ((e = readdir(dir)))
	if (!is_dot_or_dotdot(e->d_name))
	string_list_insert(list, e->d_name);

	closedir(dir);
	return 0;
	}

	/*
	* This should be "(standard input)" or something, but it will
	* probably expose many more breakages in the way no-index code
	* is bolted onto the diff callchain.
	*/
	static const char file_from_standard_input[] = "-";

	static int get_mode(const char path, int mode)
	{
	struct stat st;

	if (!path \|\| !strcmp(path, "/dev/null"))
	*mode = 0;
	#ifdef GIT_WINDOWS_NATIVE
	else if (!strcasecmp(path, "nul"))
	*mode = 0;
	#endif
	else if (path == file_from_standard_input)
	*mode = create_ce_mode(0666);
	else if (lstat(path, &st))
	return error("Could not access '%s'", path);
	else
	*mode = st.st_mode;
	return 0;
	}

	static int populate_from_stdin(struct diff_filespec *s)
	{
	struct strbuf buf = STRBUF_INIT;
	size_t size = 0;

	if (strbuf_read(&buf, 0, 0) < 0)
	return error("error while reading from stdin %s",
	strerror(errno));

	s->should_munmap = 0;
	s->data = strbuf_detach(&buf, &size);
	s->size = size;
	s->should_free = 1;
	s->is_stdin = 1;
	return 0;
	}

	static struct diff_filespec noindex_filespec(const char name, int mode)
	{
	struct diff_filespec *s;

	if (!name)
	name = "/dev/null";
	s = alloc_filespec(name);
	fill_filespec(s, null_sha1, 0, mode);
	if (name == file_from_standard_input)
	populate_from_stdin(s);
	return s;
	}

	static int queue_diff(struct diff_options *o,
	const char name1, const char name2)
	{
	int mode1 = 0, mode2 = 0;

	if (get_mode(name1, &mode1) \|\| get_mode(name2, &mode2))
	return -1;

	if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2)) {
	struct diff_filespec d1, d2;

	if (S_ISDIR(mode1)) {
	/* 2 is file that is created */
	d1 = noindex_filespec(NULL, 0);
	d2 = noindex_filespec(name2, mode2);
	name2 = NULL;
	mode2 = 0;
	} else {
	/* 1 is file that is deleted */
	d1 = noindex_filespec(name1, mode1);
	d2 = noindex_filespec(NULL, 0);
	name1 = NULL;
	mode1 = 0;
	}
	/* emit that file */
	diff_queue(&diff_queued_diff, d1, d2);

	/* and then let the entire directory be created or deleted */
	}

	if (S_ISDIR(mode1) \|\| S_ISDIR(mode2)) {
	struct strbuf buffer1 = STRBUF_INIT;
	struct strbuf buffer2 = STRBUF_INIT;
	struct string_list p1 = STRING_LIST_INIT_DUP;
	struct string_list p2 = STRING_LIST_INIT_DUP;
	int i1, i2, ret = 0;
	size_t len1 = 0, len2 = 0;

	if (name1 && read_directory_contents(name1, &p1))
	return -1;
	if (name2 && read_directory_contents(name2, &p2)) {
	string_list_clear(&p1, 0);
	return -1;
	}

	if (name1) {
	strbuf_addstr(&buffer1, name1);
	if (buffer1.len && buffer1.buf[buffer1.len - 1] != '/')
	strbuf_addch(&buffer1, '/');
	len1 = buffer1.len;
	}

	if (name2) {
	strbuf_addstr(&buffer2, name2);
	if (buffer2.len && buffer2.buf[buffer2.len - 1] != '/')
	strbuf_addch(&buffer2, '/');
	len2 = buffer2.len;
	}

	for (i1 = i2 = 0; !ret && (i1 < p1.nr \|\| i2 < p2.nr); ) {
	const char n1, n2;
	int comp;

	strbuf_setlen(&buffer1, len1);
	strbuf_setlen(&buffer2, len2);

	if (i1 == p1.nr)
	comp = 1;
	else if (i2 == p2.nr)
	comp = -1;
	else
	comp = strcmp(p1.items[i1].string, p2.items[i2].string);

	if (comp > 0)
	n1 = NULL;
	else {
	strbuf_addstr(&buffer1, p1.items[i1++].string);
	n1 = buffer1.buf;
	}

	if (comp < 0)
	n2 = NULL;
	else {
	strbuf_addstr(&buffer2, p2.items[i2++].string);
	n2 = buffer2.buf;
	}

	ret = queue_diff(o, n1, n2);
	}
	string_list_clear(&p1, 0);
	string_list_clear(&p2, 0);
	strbuf_release(&buffer1);
	strbuf_release(&buffer2);

	return ret;
	} else {
	struct diff_filespec d1, d2;

	if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
	unsigned tmp;
	const char *tmp_c;
	tmp = mode1; mode1 = mode2; mode2 = tmp;
	tmp_c = name1; name1 = name2; name2 = tmp_c;
	}

	d1 = noindex_filespec(name1, mode1);
	d2 = noindex_filespec(name2, mode2);
	diff_queue(&diff_queued_diff, d1, d2);
	return 0;
	}
	}

	/* append basename of F to D */
	static void append_basename(struct strbuf path, const char dir, const char *file)
	{
	const char *tail = strrchr(file, '/');

	strbuf_addstr(path, dir);
	while (path->len && path->buf[path->len - 1] == '/')
	path->len--;
	strbuf_addch(path, '/');
	strbuf_addstr(path, tail ? tail + 1 : file);
	}

	/*
	* DWIM "diff D F" into "diff D/F F" and "diff F D" into "diff F D/F"
	* Note that we append the basename of F to D/, so "diff a/b/file D"
	* becomes "diff a/b/file D/file", not "diff a/b/file D/a/b/file".
	*/
	static void fixup_paths(const char *path, struct strbuf replacement)
	{
	unsigned int isdir0, isdir1;

	if (path[0] == file_from_standard_input \|\|
	path[1] == file_from_standard_input)
	return;
	isdir0 = is_directory(path[0]);
	isdir1 = is_directory(path[1]);
	if (isdir0 == isdir1)
	return;
	if (isdir0) {
	append_basename(replacement, path[0], path[1]);
	path[0] = replacement->buf;
	} else {
	append_basename(replacement, path[1], path[0]);
	path[1] = replacement->buf;
	}
	}

	void diff_no_index(struct rev_info *revs,
	int argc, const char **argv,
	const char *prefix)
	{
	int i, prefixlen;
	const char *paths[2];
	struct strbuf replacement = STRBUF_INIT;

	diff_setup(&revs->diffopt);
	for (i = 1; i < argc - 2; ) {
	int j;
	if (!strcmp(argv[i], "--no-index"))
	i++;
	else if (!strcmp(argv[i], "--"))
	i++;
	else {
	j = diff_opt_parse(&revs->diffopt, argv + i, argc - i);
	if (j <= 0)
	die("invalid diff option/value: %s", argv[i]);
	i += j;
	}
	}

	prefixlen = prefix ? strlen(prefix) : 0;
	for (i = 0; i < 2; i++) {
	const char *p = argv[argc - 2 + i];
	if (!strcmp(p, "-"))
	/*
	* stdin should be spelled as "-"; if you have
	* path that is "-", spell it as "./-".
	*/
	p = file_from_standard_input;
	else if (prefixlen)
	p = xstrdup(prefix_filename(prefix, prefixlen, p));
	paths[i] = p;
	}

	fixup_paths(paths, &replacement);

	revs->diffopt.skip_stat_unmatch = 1;
	if (!revs->diffopt.output_format)
	revs->diffopt.output_format = DIFF_FORMAT_PATCH;

	DIFF_OPT_SET(&revs->diffopt, NO_INDEX);

	revs->max_count = -2;
	diff_setup_done(&revs->diffopt);

	setup_diff_pager(&revs->diffopt);
	DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);

	if (queue_diff(&revs->diffopt, paths[0], paths[1]))
	exit(1);
	diff_set_mnemonic_prefix(&revs->diffopt, "1/", "2/");
	diffcore_std(&revs->diffopt);
	diff_flush(&revs->diffopt);

	strbuf_release(&replacement);

	/*
	* The return code for --no-index imitates diff(1):
	* 0 = no changes, 1 = changes, else error
	*/
	exit(diff_result_code(&revs->diffopt, 0));
	}