src/ignore.c - third_party/libgit2 - Git at Google

 #include "git2/ignore.h"
 #include "ignore.h"
 #include "path.h"
 #include "config.h"

 #define GIT_IGNORE_INTERNAL		"[internal]exclude"
 #define GIT_IGNORE_FILE_INREPO	"info/exclude"
 #define GIT_IGNORE_FILE			".gitignore"

 static int parse_ignore_file(
 	git_repository *repo, void *parsedata, const char *buffer, git_attr_file *ignores)
 {
 	int error = 0;
 	git_attr_fnmatch *match = NULL;
 	const char *scan = NULL;
 	char *context = NULL;
 	bool ignore_case = false;
 	git_config *cfg = NULL;
 	int val;

 	/* Prefer to have the caller pass in a git_ignores as the parsedata object.
 	 * If they did not, then we can (much more slowly) find the value of
 	 * ignore_case by using the repository object. */
 	if (parsedata != NULL) {
 		ignore_case = ((git_ignores *)parsedata)->ignore_case;
 	} else {
 		if ((error = git_repository_config(&cfg, repo)) < 0)
 			return error;

 		if (git_config_get_bool(&val, cfg, "core.ignorecase") == 0)
 			ignore_case = (val != 0);

 		git_config_free(cfg);
 	}

 	if (ignores->key && git__suffixcmp(ignores->key, "/" GIT_IGNORE_FILE) == 0) {
 		context = ignores->key + 2;
 		context[strlen(context) - strlen(GIT_IGNORE_FILE)] = '\0';
 	}

 	scan = buffer;

 	while (!error && *scan) {
 		if (!match) {
 			match = git__calloc(1, sizeof(*match));
 			GITERR_CHECK_ALLOC(match);
 		}

 		match->flags = GIT_ATTR_FNMATCH_ALLOWSPACE;

 		if (!(error = git_attr_fnmatch__parse(
 			match, ignores->pool, context, &scan)))
 		{
 			match->flags |= GIT_ATTR_FNMATCH_IGNORE;

 			if (ignore_case)
 				match->flags |= GIT_ATTR_FNMATCH_ICASE;

 			scan = git__next_line(scan);
 			error = git_vector_insert(&ignores->rules, match);
 		}

 		if (error != 0) {
 			git__free(match->pattern);
 			match->pattern = NULL;

 			if (error == GIT_ENOTFOUND)
 				error = 0;
 		} else {
 			match = NULL; /* vector now "owns" the match */
 		}
 	}

 	git__free(match);
 	/* restore file path used for context */
 	if (context)
 		context[strlen(context)] = '.'; /* first char of GIT_IGNORE_FILE */

 	return error;
 }

 #define push_ignore_file(R,IGN,S,B,F) \
 	git_attr_cache__push_file((R),(B),(F),GIT_ATTR_FILE_FROM_FILE,parse_ignore_file,(IGN),(S))

 static int push_one_ignore(void *ref, git_buf *path)
 {
 	git_ignores *ign = (git_ignores *)ref;
 	return push_ignore_file(ign->repo, ign, &ign->ign_path, path->ptr, GIT_IGNORE_FILE);
 }

 int git_ignore__for_path(
 	git_repository *repo,
 	const char *path,
 	git_ignores *ignores)
 {
 	int error = 0;
 	const char *workdir = git_repository_workdir(repo);
 	git_config *cfg = NULL;
 	int val;

 	assert(ignores);

 	ignores->repo = repo;
 	git_buf_init(&ignores->dir, 0);
 	ignores->ign_internal = NULL;

 	/* Set the ignore_case flag appropriately */
 	if ((error = git_repository_config(&cfg, repo)) < 0)
 		goto cleanup;

 	if (git_config_get_bool(&val, cfg, "core.ignorecase") == 0)
 		ignores->ignore_case = (val != 0);
 	else
 		ignores->ignore_case = 0;

 	git_config_free(cfg);

 	if ((error = git_vector_init(&ignores->ign_path, 8, NULL)) < 0 ||
 		(error = git_vector_init(&ignores->ign_global, 2, NULL)) < 0 ||
 		(error = git_attr_cache__init(repo)) < 0)
 		goto cleanup;

 	/* given a unrooted path in a non-bare repo, resolve it */
 	if (workdir && git_path_root(path) < 0)
 		error = git_path_find_dir(&ignores->dir, path, workdir);
 	else
 		error = git_buf_sets(&ignores->dir, path);
 	if (error < 0)
 		goto cleanup;

 	/* set up internals */
 	error = git_attr_cache__internal_file(
 		repo, GIT_IGNORE_INTERNAL, &ignores->ign_internal);
 	if (error < 0)
 		goto cleanup;

 	/* load .gitignore up the path */
 	if (workdir != NULL) {
 		error = git_path_walk_up(
 			&ignores->dir, workdir, push_one_ignore, ignores);
 		if (error < 0)
 			goto cleanup;
 	}

 	/* load .git/info/exclude */
 	error = push_ignore_file(repo, ignores, &ignores->ign_global,
 		git_repository_path(repo), GIT_IGNORE_FILE_INREPO);
 	if (error < 0)
 		goto cleanup;

 	/* load core.excludesfile */
 	if (git_repository_attr_cache(repo)->cfg_excl_file != NULL)
 		error = push_ignore_file(repo, ignores, &ignores->ign_global, NULL,
 			git_repository_attr_cache(repo)->cfg_excl_file);

 cleanup:
 	if (error < 0)
 		git_ignore__free(ignores);

 	return error;
 }

 int git_ignore__push_dir(git_ignores *ign, const char *dir)
 {
 	if (git_buf_joinpath(&ign->dir, ign->dir.ptr, dir) < 0)
 		return -1;
 	else
 		return push_ignore_file(
 			ign->repo, ign, &ign->ign_path, ign->dir.ptr, GIT_IGNORE_FILE);
 }

 int git_ignore__pop_dir(git_ignores *ign)
 {
 	if (ign->ign_path.length > 0) {
 		git_attr_file *file = git_vector_last(&ign->ign_path);
 		if (git__suffixcmp(ign->dir.ptr, file->key + 2) == 0)
 			git_vector_pop(&ign->ign_path);
 		git_buf_rtruncate_at_char(&ign->dir, '/');
 	}
 	return 0;
 }

 void git_ignore__free(git_ignores *ignores)
 {
 	/* don't need to free ignores->ign_internal since it is in cache */
 	git_vector_free(&ignores->ign_path);
 	git_vector_free(&ignores->ign_global);
 	git_buf_free(&ignores->dir);
 }

 static bool ignore_lookup_in_rules(
 	git_vector *rules, git_attr_path *path, int *ignored)
 {
 	size_t j;
 	git_attr_fnmatch *match;

 	git_vector_rforeach(rules, j, match) {
 		if (git_attr_fnmatch__match(match, path)) {
 			*ignored = ((match->flags & GIT_ATTR_FNMATCH_NEGATIVE) == 0);
 			return true;
 		}
 	}

 	return false;
 }

 int git_ignore__lookup(
 	git_ignores *ignores, const char *pathname, int *ignored)
 {
 	unsigned int i;
 	git_attr_file *file;
 	git_attr_path path;

 	if (git_attr_path__init(
 		&path, pathname, git_repository_workdir(ignores->repo)) < 0)
 		return -1;

 	/* first process builtins - success means path was found */
 	if (ignore_lookup_in_rules(
 			&ignores->ign_internal->rules, &path, ignored))
 		goto cleanup;

 	/* next process files in the path */
 	git_vector_foreach(&ignores->ign_path, i, file) {
 		if (ignore_lookup_in_rules(&file->rules, &path, ignored))
 			goto cleanup;
 	}

 	/* last process global ignores */
 	git_vector_foreach(&ignores->ign_global, i, file) {
 		if (ignore_lookup_in_rules(&file->rules, &path, ignored))
 			goto cleanup;
 	}

 	*ignored = 0;

 cleanup:
 	git_attr_path__free(&path);
 	return 0;
 }

 static int get_internal_ignores(git_attr_file **ign, git_repository *repo)
 {
 	int error;

 	if (!(error = git_attr_cache__init(repo)))
 		error = git_attr_cache__internal_file(repo, GIT_IGNORE_INTERNAL, ign);

 	return error;
 }

 int git_ignore_add_rule(
 	git_repository *repo,
 	const char *rules)
 {
 	int error;
 	git_attr_file *ign_internal;

 	if (!(error = get_internal_ignores(&ign_internal, repo)))
 		error = parse_ignore_file(repo, NULL, rules, ign_internal);

 	return error;
 }

 int git_ignore_clear_internal_rules(
 	git_repository *repo)
 {
 	int error;
 	git_attr_file *ign_internal;

 	if (!(error = get_internal_ignores(&ign_internal, repo)))
 		git_attr_file__clear_rules(ign_internal);

 	return error;
 }

 int git_ignore_path_is_ignored(
 	int *ignored,
 	git_repository *repo,
 	const char *pathname)
 {
 	int error;
 	const char *workdir;
 	git_attr_path path;
 	char *tail, *end;
 	bool full_is_dir;
 	git_ignores ignores;
 	unsigned int i;
 	git_attr_file *file;

 	assert(ignored && pathname);

 	workdir = repo ? git_repository_workdir(repo) : NULL;

 	if ((error = git_attr_path__init(&path, pathname, workdir)) < 0)
 		return error;

 	tail = path.path;
 	end  = &path.full.ptr[path.full.size];
 	full_is_dir = path.is_dir;

 	while (1) {
 		/* advance to next component of path */
 		path.basename = tail;

 		while (tail < end && *tail != '/') tail++;
 		*tail = '\0';

 		path.full.size = (tail - path.full.ptr);
 		path.is_dir = (tail == end) ? full_is_dir : true;

 		/* update ignores for new path fragment */
 		if (path.basename == path.path)
 			error = git_ignore__for_path(repo, path.path, &ignores);
 		else
 			error = git_ignore__push_dir(&ignores, path.basename);
 		if (error < 0)
 			break;

 		/* first process builtins - success means path was found */
 		if (ignore_lookup_in_rules(
 				&ignores.ign_internal->rules, &path, ignored))
 			goto cleanup;

 		/* next process files in the path */
 		git_vector_foreach(&ignores.ign_path, i, file) {
 			if (ignore_lookup_in_rules(&file->rules, &path, ignored))
 				goto cleanup;
 		}

 		/* last process global ignores */
 		git_vector_foreach(&ignores.ign_global, i, file) {
 			if (ignore_lookup_in_rules(&file->rules, &path, ignored))
 				goto cleanup;
 		}

 		/* if we found no rules before reaching the end, we're done */
 		if (tail == end)
 			break;

 		/* reinstate divider in path */
 		*tail = '/';
 		while (*tail == '/') tail++;
 	}

 	*ignored = 0;

 cleanup:
 	git_attr_path__free(&path);
 	git_ignore__free(&ignores);
 	return error;
 }
	#include "git2/ignore.h"
	#include "ignore.h"
	#include "path.h"
	#include "config.h"

	#define GIT_IGNORE_INTERNAL "[internal]exclude"
	#define GIT_IGNORE_FILE_INREPO "info/exclude"
	#define GIT_IGNORE_FILE ".gitignore"

	static int parse_ignore_file(
	git_repository repo, void parsedata, const char buffer, git_attr_file ignores)
	{
	int error = 0;
	git_attr_fnmatch *match = NULL;
	const char *scan = NULL;
	char *context = NULL;
	bool ignore_case = false;
	git_config *cfg = NULL;
	int val;

	/* Prefer to have the caller pass in a git_ignores as the parsedata object.
	* If they did not, then we can (much more slowly) find the value of
	* ignore_case by using the repository object. */
	if (parsedata != NULL) {
	ignore_case = ((git_ignores *)parsedata)->ignore_case;
	} else {
	if ((error = git_repository_config(&cfg, repo)) < 0)
	return error;

	if (git_config_get_bool(&val, cfg, "core.ignorecase") == 0)
	ignore_case = (val != 0);

	git_config_free(cfg);
	}

	if (ignores->key && git__suffixcmp(ignores->key, "/" GIT_IGNORE_FILE) == 0) {
	context = ignores->key + 2;
	context[strlen(context) - strlen(GIT_IGNORE_FILE)] = '\0';
	}

	scan = buffer;

	while (!error && *scan) {
	if (!match) {
	match = git__calloc(1, sizeof(*match));
	GITERR_CHECK_ALLOC(match);
	}

	match->flags = GIT_ATTR_FNMATCH_ALLOWSPACE;

	if (!(error = git_attr_fnmatch__parse(
	match, ignores->pool, context, &scan)))
	{
	match->flags \|= GIT_ATTR_FNMATCH_IGNORE;

	if (ignore_case)
	match->flags \|= GIT_ATTR_FNMATCH_ICASE;

	scan = git__next_line(scan);
	error = git_vector_insert(&ignores->rules, match);
	}

	if (error != 0) {
	git__free(match->pattern);
	match->pattern = NULL;

	if (error == GIT_ENOTFOUND)
	error = 0;
	} else {
	match = NULL; /* vector now "owns" the match */
	}
	}

	git__free(match);
	/* restore file path used for context */
	if (context)
	context[strlen(context)] = '.'; /* first char of GIT_IGNORE_FILE */

	return error;
	}

	#define push_ignore_file(R,IGN,S,B,F) \
	git_attr_cache__push_file((R),(B),(F),GIT_ATTR_FILE_FROM_FILE,parse_ignore_file,(IGN),(S))

	static int push_one_ignore(void ref, git_buf path)
	{
	git_ignores ign = (git_ignores )ref;
	return push_ignore_file(ign->repo, ign, &ign->ign_path, path->ptr, GIT_IGNORE_FILE);
	}

	int git_ignore__for_path(
	git_repository *repo,
	const char *path,
	git_ignores *ignores)
	{
	int error = 0;
	const char *workdir = git_repository_workdir(repo);
	git_config *cfg = NULL;
	int val;

	assert(ignores);

	ignores->repo = repo;
	git_buf_init(&ignores->dir, 0);
	ignores->ign_internal = NULL;

	/* Set the ignore_case flag appropriately */
	if ((error = git_repository_config(&cfg, repo)) < 0)
	goto cleanup;

	if (git_config_get_bool(&val, cfg, "core.ignorecase") == 0)
	ignores->ignore_case = (val != 0);
	else
	ignores->ignore_case = 0;

	git_config_free(cfg);

	if ((error = git_vector_init(&ignores->ign_path, 8, NULL)) < 0 \|\|
	(error = git_vector_init(&ignores->ign_global, 2, NULL)) < 0 \|\|
	(error = git_attr_cache__init(repo)) < 0)
	goto cleanup;

	/* given a unrooted path in a non-bare repo, resolve it */
	if (workdir && git_path_root(path) < 0)
	error = git_path_find_dir(&ignores->dir, path, workdir);
	else
	error = git_buf_sets(&ignores->dir, path);
	if (error < 0)
	goto cleanup;

	/* set up internals */
	error = git_attr_cache__internal_file(
	repo, GIT_IGNORE_INTERNAL, &ignores->ign_internal);
	if (error < 0)
	goto cleanup;

	/* load .gitignore up the path */
	if (workdir != NULL) {
	error = git_path_walk_up(
	&ignores->dir, workdir, push_one_ignore, ignores);
	if (error < 0)
	goto cleanup;
	}

	/* load .git/info/exclude */
	error = push_ignore_file(repo, ignores, &ignores->ign_global,
	git_repository_path(repo), GIT_IGNORE_FILE_INREPO);
	if (error < 0)
	goto cleanup;

	/* load core.excludesfile */
	if (git_repository_attr_cache(repo)->cfg_excl_file != NULL)
	error = push_ignore_file(repo, ignores, &ignores->ign_global, NULL,
	git_repository_attr_cache(repo)->cfg_excl_file);

	cleanup:
	if (error < 0)
	git_ignore__free(ignores);

	return error;
	}

	int git_ignore__push_dir(git_ignores ign, const char dir)
	{
	if (git_buf_joinpath(&ign->dir, ign->dir.ptr, dir) < 0)
	return -1;
	else
	return push_ignore_file(
	ign->repo, ign, &ign->ign_path, ign->dir.ptr, GIT_IGNORE_FILE);
	}

	int git_ignore__pop_dir(git_ignores *ign)
	{
	if (ign->ign_path.length > 0) {
	git_attr_file *file = git_vector_last(&ign->ign_path);
	if (git__suffixcmp(ign->dir.ptr, file->key + 2) == 0)
	git_vector_pop(&ign->ign_path);
	git_buf_rtruncate_at_char(&ign->dir, '/');
	}
	return 0;
	}

	void git_ignore__free(git_ignores *ignores)
	{
	/* don't need to free ignores->ign_internal since it is in cache */
	git_vector_free(&ignores->ign_path);
	git_vector_free(&ignores->ign_global);
	git_buf_free(&ignores->dir);
	}

	static bool ignore_lookup_in_rules(
	git_vector rules, git_attr_path path, int *ignored)
	{
	size_t j;
	git_attr_fnmatch *match;

	git_vector_rforeach(rules, j, match) {
	if (git_attr_fnmatch__match(match, path)) {
	*ignored = ((match->flags & GIT_ATTR_FNMATCH_NEGATIVE) == 0);
	return true;
	}
	}

	return false;
	}

	int git_ignore__lookup(
	git_ignores ignores, const char pathname, int *ignored)
	{
	unsigned int i;
	git_attr_file *file;
	git_attr_path path;

	if (git_attr_path__init(
	&path, pathname, git_repository_workdir(ignores->repo)) < 0)
	return -1;

	/* first process builtins - success means path was found */
	if (ignore_lookup_in_rules(
	&ignores->ign_internal->rules, &path, ignored))
	goto cleanup;

	/* next process files in the path */
	git_vector_foreach(&ignores->ign_path, i, file) {
	if (ignore_lookup_in_rules(&file->rules, &path, ignored))
	goto cleanup;
	}

	/* last process global ignores */
	git_vector_foreach(&ignores->ign_global, i, file) {
	if (ignore_lookup_in_rules(&file->rules, &path, ignored))
	goto cleanup;
	}

	*ignored = 0;

	cleanup:
	git_attr_path__free(&path);
	return 0;
	}

	static int get_internal_ignores(git_attr_file *ign, git_repository repo)
	{
	int error;

	if (!(error = git_attr_cache__init(repo)))
	error = git_attr_cache__internal_file(repo, GIT_IGNORE_INTERNAL, ign);

	return error;
	}

	int git_ignore_add_rule(
	git_repository *repo,
	const char *rules)
	{
	int error;
	git_attr_file *ign_internal;

	if (!(error = get_internal_ignores(&ign_internal, repo)))
	error = parse_ignore_file(repo, NULL, rules, ign_internal);

	return error;
	}

	int git_ignore_clear_internal_rules(
	git_repository *repo)
	{
	int error;
	git_attr_file *ign_internal;

	if (!(error = get_internal_ignores(&ign_internal, repo)))
	git_attr_file__clear_rules(ign_internal);

	return error;
	}

	int git_ignore_path_is_ignored(
	int *ignored,
	git_repository *repo,
	const char *pathname)
	{
	int error;
	const char *workdir;
	git_attr_path path;
	char tail, end;
	bool full_is_dir;
	git_ignores ignores;
	unsigned int i;
	git_attr_file *file;

	assert(ignored && pathname);

	workdir = repo ? git_repository_workdir(repo) : NULL;

	if ((error = git_attr_path__init(&path, pathname, workdir)) < 0)
	return error;

	tail = path.path;
	end = &path.full.ptr[path.full.size];
	full_is_dir = path.is_dir;

	while (1) {
	/* advance to next component of path */
	path.basename = tail;

	while (tail < end && *tail != '/') tail++;
	*tail = '\0';

	path.full.size = (tail - path.full.ptr);
	path.is_dir = (tail == end) ? full_is_dir : true;

	/* update ignores for new path fragment */
	if (path.basename == path.path)
	error = git_ignore__for_path(repo, path.path, &ignores);
	else
	error = git_ignore__push_dir(&ignores, path.basename);
	if (error < 0)
	break;

	/* first process builtins - success means path was found */
	if (ignore_lookup_in_rules(
	&ignores.ign_internal->rules, &path, ignored))
	goto cleanup;

	/* next process files in the path */
	git_vector_foreach(&ignores.ign_path, i, file) {
	if (ignore_lookup_in_rules(&file->rules, &path, ignored))
	goto cleanup;
	}

	/* last process global ignores */
	git_vector_foreach(&ignores.ign_global, i, file) {
	if (ignore_lookup_in_rules(&file->rules, &path, ignored))
	goto cleanup;
	}

	/* if we found no rules before reaching the end, we're done */
	if (tail == end)
	break;

	/* reinstate divider in path */
	*tail = '/';
	while (*tail == '/') tail++;
	}

	*ignored = 0;

	cleanup:
	git_attr_path__free(&path);
	git_ignore__free(&ignores);
	return error;
	}