Merge pull request #531 from arrbee/gitignore

Initial implementation of gitignore support

git_status_foreach() and git_status_file() will now be
gitignore aware.

include/git2/index.h

@@ -169,6 +169,10 @@ GIT_EXTERN(void) git_index_uniq(git_index *index);
  *
  * This method will fail in bare index instances.
  *
+ * This forces the file to be added to the index, not looking
+ * at gitignore rules.  Those rules can be evaluated through
+ * the git_status APIs (in status.h) before calling this.
+ *
  * @param index an existing index object
  * @param path filename to add
  * @param stage stage for the entry

include/git2/status.h

@@ -20,6 +20,7 @@
 GIT_BEGIN_DECL
 
 #define GIT_STATUS_CURRENT		0
+
 /** Flags for index status */
 #define GIT_STATUS_INDEX_NEW		(1 << 0)
 #define GIT_STATUS_INDEX_MODIFIED	(1 << 1)
@@ -30,7 +31,6 @@ GIT_BEGIN_DECL
 #define GIT_STATUS_WT_MODIFIED		(1 << 4)
 #define GIT_STATUS_WT_DELETED		(1 << 5)
 
-// TODO Ignored files not handled yet
 #define GIT_STATUS_IGNORED			(1 << 6)
 
 /**
@@ -58,6 +58,22 @@ GIT_EXTERN(int) git_status_foreach(git_repository *repo, int (*callback)(const c
  */
 GIT_EXTERN(int) git_status_file(unsigned int *status_flags, git_repository *repo, const char *path);
 
+/**
+ * Test if the ignore rules apply to a given file.
+ *
+ * This function simply checks the ignore rules to see if they would apply
+ * to the given file.  Unlike git_status_file(), this indicates if the file
+ * would be ignored regardless of whether the file is already in the index
+ * or in the repository.
+ *
+ * @param repo a repository object
+ * @param path the file to check ignores for, rooted at the repo's workdir
+ * @param ignored boolean returning 0 if the file is not ignored, 1 if it is
+ * @return GIT_SUCCESS if the ignore rules could be processed for the file
+ *		(regardless of whether it exists or not), or an error < 0 if they could not.
+ */
+GIT_EXTERN(int) git_status_should_ignore(git_repository *repo, const char *path, int *ignored);
+
 /** @} */
 GIT_END_DECL
 #endif

src/attr.c

@@ -3,15 +3,9 @@
 #include "config.h"
 #include <ctype.h>
 
-#define GIT_ATTR_FILE_INREPO	"info/attributes"
-#define GIT_ATTR_FILE			".gitattributes"
-#define GIT_ATTR_FILE_SYSTEM	"gitattributes"
-
 static int collect_attr_files(
 	git_repository *repo, const char *path, git_vector *files);
 
-static int attr_cache_init(git_repository *repo);
-
 
 int git_attr_get(
     git_repository *repo, const char *pathname,
@@ -186,7 +180,7 @@ int git_attr_add_macro(
 	int error;
 	git_attr_rule *macro = NULL;
 
-	if ((error = attr_cache_init(repo)) < GIT_SUCCESS)
+	if ((error = git_attr_cache__init(repo)) < GIT_SUCCESS)
 		return error;
 
 	macro = git__calloc(1, sizeof(git_attr_rule));
@@ -215,11 +209,12 @@ int git_attr_add_macro(
 
 
 /* add git_attr_file to vector of files, loading if needed */
-static int push_attrs(
+int git_attr_cache__push_file(
 	git_repository *repo,
-	git_vector     *files,
+	git_vector     *stack,
 	const char     *base,
-	const char     *filename)
+	const char     *filename,
+	int (*loader)(git_repository *, const char *, git_attr_file **))
 {
 	int error = GIT_SUCCESS;
 	git_attr_cache *cache = &repo->attrcache;
@@ -227,23 +222,22 @@ static int push_attrs(
 	git_attr_file *file;
 	int add_to_cache = 0;
 
-	if ((error = git_path_prettify(&path, filename, base)) < GIT_SUCCESS) {
-		if (error == GIT_EOSERR)
-			/* file was not found -- ignore error */
-			error = GIT_SUCCESS;
+	if (base != NULL) {
+		if ((error = git_buf_joinpath(&path, base, filename)) < GIT_SUCCESS)
 			goto cleanup;
+		filename = path.ptr;
 	}
 
 	/* either get attr_file from cache or read from disk */
-	file = git_hashtable_lookup(cache->files, path.ptr);
-	if (file == NULL) {
-		error = git_attr_file__from_file(repo, path.ptr, &file);
+	file = git_hashtable_lookup(cache->files, filename);
+	if (file == NULL && git_futils_exists(filename) == GIT_SUCCESS) {
+		error = (*loader)(repo, filename, &file);
 		add_to_cache = (error == GIT_SUCCESS);
 	}
 
 	if (file != NULL) {
 		/* add file to vector, if we found it */
-		error = git_vector_insert(files, file);
+		error = git_vector_insert(stack, file);
 
 		/* add file to cache, if it is new */
 		/* do this after above step b/c it is not critical */
@@ -256,6 +250,19 @@ cleanup:
 	return error;
 }
 
+#define push_attrs(R,S,B,F) \
+	git_attr_cache__push_file((R),(S),(B),(F),git_attr_file__from_file)
+
+typedef struct {
+	git_repository *repo;
+	git_vector *files;
+} attr_walk_up_info;
+
+static int push_one_attr(void *ref, git_buf *path)
+{
+	attr_walk_up_info *info = (attr_walk_up_info *)ref;
+	return push_attrs(info->repo, info->files, path->ptr, GIT_ATTR_FILE);
+}
 
 static int collect_attr_files(
 	git_repository *repo, const char *path, git_vector *files)
@@ -264,22 +271,16 @@ static int collect_attr_files(
 	git_buf dir = GIT_BUF_INIT;
 	git_config *cfg;
 	const char *workdir = git_repository_workdir(repo);
+	attr_walk_up_info info;
 
-	if ((error = attr_cache_init(repo)) < GIT_SUCCESS)
+	if ((error = git_attr_cache__init(repo)) < GIT_SUCCESS)
 		goto cleanup;
 
 	if ((error = git_vector_init(files, 4, NULL)) < GIT_SUCCESS)
 		goto cleanup;
 
-	if ((error = git_path_prettify(&dir, path, workdir)) < GIT_SUCCESS)
-		goto cleanup;
-
-	if (git_futils_isdir(dir.ptr) != GIT_SUCCESS) {
-		git_path_dirname_r(&dir, dir.ptr);
-		git_path_to_dir(&dir);
-		if ((error = git_buf_lasterror(&dir)) < GIT_SUCCESS)
+	if ((error = git_futils_dir_for_path(&dir, path, workdir)) < GIT_SUCCESS)
 		goto cleanup;
-	}
 
 	/* in precendence order highest to lowest:
 	 * - $GIT_DIR/info/attributes
@@ -292,26 +293,15 @@ static int collect_attr_files(
 	if (error < GIT_SUCCESS)
 		goto cleanup;
 
-	if (workdir && git__prefixcmp(dir.ptr, workdir) == 0) {
-		ssize_t rootlen = (ssize_t)strlen(workdir);
-
-		do {
-			error = push_attrs(repo, files, dir.ptr, GIT_ATTR_FILE);
-			if (error == GIT_SUCCESS) {
-				git_path_dirname_r(&dir, dir.ptr);
-				git_path_to_dir(&dir);
-				error = git_buf_lasterror(&dir);
-			}
-		} while (!error && dir.size >= rootlen);
-	} else {
-		error = push_attrs(repo, files, dir.ptr, GIT_ATTR_FILE);
-	}
+	info.repo = repo;
+	info.files = files;
+	error = git_path_walk_up(&dir, workdir, push_one_attr, &info);
 	if (error < GIT_SUCCESS)
 		goto cleanup;
 
-	if (git_repository_config(&cfg, repo) == GIT_SUCCESS) {
+	if ((error = git_repository_config(&cfg, repo)) == GIT_SUCCESS) {
 		const char *core_attribs = NULL;
-		git_config_get_string(cfg, "core.attributesfile", &core_attribs);
+		git_config_get_string(cfg, GIT_ATTR_CONFIG, &core_attribs);
 		git_clearerror(); /* don't care if attributesfile is not set */
 		if (core_attribs)
 			error = push_attrs(repo, files, NULL, core_attribs);
@@ -337,7 +327,7 @@ static int collect_attr_files(
 }
 
 
-static int attr_cache_init(git_repository *repo)
+int git_attr_cache__init(git_repository *repo)
 {
 	int error = GIT_SUCCESS;
 	git_attr_cache *cache = &repo->attrcache;
@@ -367,7 +357,6 @@ static int attr_cache_init(git_repository *repo)
 	return error;
 }
 
-
 void git_attr_cache_flush(
 	git_repository *repo)
 {
@@ -398,3 +387,12 @@ void git_attr_cache_flush(
 
 	repo->attrcache.initialized = 0;
 }
+
+int git_attr_cache__insert_macro(git_repository *repo, git_attr_rule *macro)
+{
+	if (macro->assigns.length == 0)
+		return git__throw(GIT_EMISSINGOBJDATA, "git attribute macro with no values");
+
+	return git_hashtable_insert(
+		repo->attrcache.macros, macro->match.pattern, macro);
+}

src/attr.h

+/*
+ * Copyright (C) 2009-2011 the libgit2 contributors
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+#ifndef INCLUDE_attr_h__
+#define INCLUDE_attr_h__
+
+#include "attr_file.h"
+
+typedef struct {
+	int initialized;
+	git_hashtable *files;	/* hash path to git_attr_file of rules */
+	git_hashtable *macros;	/* hash name to vector<git_attr_assignment> */
+} git_attr_cache;
+
+extern int git_attr_cache__init(git_repository *repo);
+
+extern int git_attr_cache__insert_macro(
+	git_repository *repo, git_attr_rule *macro);
+
+extern int git_attr_cache__push_file(
+	git_repository *repo,
+	git_vector     *stack,
+	const char     *base,
+	const char     *filename,
+	int (*loader)(git_repository *, const char *, git_attr_file **));
+
+#endif

src/attr_file.c

@@ -6,17 +6,29 @@
 const char *git_attr__true  = "[internal]__TRUE__";
 const char *git_attr__false = "[internal]__FALSE__";
 
-static int git_attr_fnmatch__parse(git_attr_fnmatch *spec, const char **base);
 static int sort_by_hash_and_name(const void *a_raw, const void *b_raw);
 static void git_attr_rule__clear(git_attr_rule *rule);
 
-int git_attr_cache__insert_macro(git_repository *repo, git_attr_rule *macro)
+int git_attr_file__new(git_attr_file **attrs_ptr)
 {
-	if (macro->assigns.length == 0)
-		return git__throw(GIT_EMISSINGOBJDATA, "git attribute macro with no values");
+	int error;
+	git_attr_file *attrs = NULL;
+
+	attrs = git__calloc(1, sizeof(git_attr_file));
+	if (attrs == NULL)
+		error = GIT_ENOMEM;
+	else
+		error = git_vector_init(&attrs->rules, 4, NULL);
+
+	if (error != GIT_SUCCESS) {
+		git__rethrow(error, "Could not allocate attribute storage");
+		git__free(attrs);
+		attrs = NULL;
+	}
+
+	*attrs_ptr = attrs;
 
-	return git_hashtable_insert(
-		repo->attrcache.macros, macro->match.pattern, macro);
+	return error;
 }
 
 int git_attr_file__from_buffer(
@@ -29,17 +41,8 @@ int git_attr_file__from_buffer(
 
 	*out = NULL;
 
-	attrs = git__calloc(1, sizeof(git_attr_file));
-	if (attrs == NULL)
-		return git__throw(GIT_ENOMEM, "Could not allocate attribute storage");
-
-	attrs->path = NULL;
-
-	error = git_vector_init(&attrs->rules, 4, NULL);
-	if (error != GIT_SUCCESS) {
-		git__rethrow(error, "Could not initialize attribute storage");
+	if ((error = git_attr_file__new(&attrs)) < GIT_SUCCESS)
 		goto cleanup;
-	}
 
 	scan = buffer;
 
@@ -166,19 +169,28 @@ int git_attr_file__lookup_one(
 }
 
 
-int git_attr_rule__match_path(
-	git_attr_rule *rule,
+int git_attr_fnmatch__match(
+	git_attr_fnmatch *match,
 	const git_attr_path *path)
 {
 	int matched = FNM_NOMATCH;
 
-	if (rule->match.flags & GIT_ATTR_FNMATCH_DIRECTORY && !path->is_dir)
+	if (match->flags & GIT_ATTR_FNMATCH_DIRECTORY && !path->is_dir)
 		return matched;
 
-	if (rule->match.flags & GIT_ATTR_FNMATCH_FULLPATH)
-		matched = p_fnmatch(rule->match.pattern, path->path, FNM_PATHNAME);
+	if (match->flags & GIT_ATTR_FNMATCH_FULLPATH)
+		matched = p_fnmatch(match->pattern, path->path, FNM_PATHNAME);
 	else
-		matched = p_fnmatch(rule->match.pattern, path->basename, 0);
+		matched = p_fnmatch(match->pattern, path->basename, 0);
+
+	return matched;
+}
+
+int git_attr_rule__match(
+	git_attr_rule *rule,
+	const git_attr_path *path)
+{
+	int matched = git_attr_fnmatch__match(&rule->match, path);
 
 	if (rule->match.flags & GIT_ATTR_FNMATCH_NEGATIVE)
 		matched = (matched == GIT_SUCCESS) ? FNM_NOMATCH : GIT_SUCCESS;
@@ -186,6 +198,7 @@ int git_attr_rule__match_path(
 	return matched;
 }
 
+
 git_attr_assignment *git_attr_rule__lookup_assignment(
 	git_attr_rule *rule, const char *name)
 {
@@ -203,6 +216,7 @@ git_attr_assignment *git_attr_rule__lookup_assignment(
 int git_attr_path__init(
 	git_attr_path *info, const char *path)
 {
+	assert(info && path);
 	info->path = path;
 	info->basename = strrchr(path, '/');
 	if (info->basename)
@@ -251,23 +265,21 @@ int git_attr_path__init(
  * GIT_ENOTFOUND if the fnmatch does not require matching, or
  * another error code there was an actual problem.
  */
-static int git_attr_fnmatch__parse(
+int git_attr_fnmatch__parse(
 	git_attr_fnmatch *spec,
 	const char **base)
 {
-	const char *pattern;
-	const char *scan;
+	const char *pattern, *scan;
 	int slash_count;
-	int error = GIT_SUCCESS;
 
-	assert(base && *base);
+	assert(spec && base && *base);
 
 	pattern = *base;
 
 	while (isspace(*pattern)) pattern++;
 	if (!*pattern || *pattern == '#') {
-		error = GIT_ENOTFOUND;
-		goto skip_to_eol;
+		*base = git__next_line(pattern);
+		return GIT_ENOTFOUND;
 	}
 
 	spec->flags = 0;
@@ -276,11 +288,8 @@ static int git_attr_fnmatch__parse(
 		if (strncmp(pattern, "[attr]", 6) == 0) {
 			spec->flags = spec->flags | GIT_ATTR_FNMATCH_MACRO;
 			pattern += 6;
-		} else {
-			/* unrecognized meta instructions - skip the line */
-			error = GIT_ENOTFOUND;
-			goto skip_to_eol;
 		}
+		/* else a character range like [a-e]* which is accepted */
 	}
 
 	if (*pattern == '!') {
@@ -290,6 +299,7 @@ static int git_attr_fnmatch__parse(
 
 	slash_count = 0;
 	for (scan = pattern; *scan != '\0'; ++scan) {
+		/* scan until (non-escaped) white space */
 		if (isspace(*scan) && *(scan - 1) != '\\')
 			break;
 
@@ -300,13 +310,15 @@ static int git_attr_fnmatch__parse(
 	}
 
 	*base = scan;
+
 	spec->length = scan - pattern;
 	spec->pattern = git__strndup(pattern, spec->length);
 
 	if (!spec->pattern) {
-		error = GIT_ENOMEM;
-		goto skip_to_eol;
+		*base = git__next_line(pattern);
+		return GIT_ENOMEM;
 	} else {
+		/* remove '\' that might have be used for internal whitespace */
 		char *from = spec->pattern, *to = spec->pattern;
 		while (*from) {
 			if (*from == '\\') {
@@ -327,14 +339,6 @@ static int git_attr_fnmatch__parse(
 	}
 
 	return GIT_SUCCESS;
-
-skip_to_eol:
-	/* skip to end of line */
-	while (*pattern && *pattern != '\n') pattern++;
-	if (*pattern == '\n') pattern++;
-	*base = pattern;
-
-	return error;
 }
 
 static int sort_by_hash_and_name(const void *a_raw, const void *b_raw)
@@ -494,10 +498,7 @@ int git_attr_assignment__parse(
 	if (assign != NULL)
 		git_attr_assignment__free(assign);
 
-	while (*scan && *scan != '\n') scan++;
-	if (*scan == '\n') scan++;
-
-	*base = scan;
+	*base = git__next_line(scan);
 
 	return error;
 }
@@ -510,14 +511,15 @@ static void git_attr_rule__clear(git_attr_rule *rule)
 	if (!rule)
 		return;
 
-	git__free(rule->match.pattern);
-	rule->match.pattern = NULL;
-	rule->match.length = 0;
-
+	if (!(rule->match.flags & GIT_ATTR_FNMATCH_IGNORE)) {
 		git_vector_foreach(&rule->assigns, i, assign)
 			GIT_REFCOUNT_DEC(assign, git_attr_assignment__free);
-
 		git_vector_free(&rule->assigns);
+	}
+
+	git__free(rule->match.pattern);
+	rule->match.pattern = NULL;
+	rule->match.length = 0;
 }
 
 void git_attr_rule__free(git_attr_rule *rule)

src/attr_file.h

@@ -11,10 +11,16 @@
 #include "vector.h"
 #include "hashtable.h"
 
+#define GIT_ATTR_FILE			".gitattributes"
+#define GIT_ATTR_FILE_INREPO	"info/attributes"
+#define GIT_ATTR_FILE_SYSTEM	"gitattributes"
+#define GIT_ATTR_CONFIG			"core.attributesfile"
+
 #define GIT_ATTR_FNMATCH_NEGATIVE	(1U << 0)
 #define GIT_ATTR_FNMATCH_DIRECTORY	(1U << 1)
 #define GIT_ATTR_FNMATCH_FULLPATH	(1U << 2)
 #define GIT_ATTR_FNMATCH_MACRO		(1U << 3)
+#define GIT_ATTR_FNMATCH_IGNORE		(1U << 4)
 
 typedef struct {
 	char *pattern;
@@ -23,6 +29,11 @@ typedef struct {
 } git_attr_fnmatch;
 
 typedef struct {
+	git_attr_fnmatch match;
+	git_vector assigns;		/* vector of <git_attr_assignment*> */
+} git_attr_rule;
+
+typedef struct {
 	git_refcount unused;
 	const char *name;
     unsigned long name_hash;
@@ -37,13 +48,8 @@ typedef struct {
 } git_attr_assignment;
 
 typedef struct {
-	git_attr_fnmatch match;
-	git_vector assigns;			/* vector of <git_attr_assignment*> */
-} git_attr_rule;
-
-typedef struct {
 	char *path;				/* cache the path this was loaded from */
-	git_vector rules;			/* vector of <git_attr_rule*> */
+	git_vector rules;		/* vector of <rule*> or <fnmatch*> */
 } git_attr_file;
 
 typedef struct {
@@ -52,12 +58,6 @@ typedef struct {
 	int is_dir;
 } git_attr_path;
 
-typedef struct {
-	int initialized;
-	git_hashtable *files;	  /* hash path to git_attr_file */
-	git_hashtable *macros;	  /* hash name to vector<git_attr_assignment> */
-} git_attr_cache;
-
 /*
  * git_attr_file API
  */
@@ -67,6 +67,7 @@ extern int git_attr_file__from_buffer(
 extern int git_attr_file__from_file(
 	git_repository *repo, const char *path, git_attr_file **out);
 
+extern int git_attr_file__new(git_attr_file **attrs_ptr);
 extern void git_attr_file__free(git_attr_file *file);
 
 extern int git_attr_file__lookup_one(
@@ -78,7 +79,7 @@ extern int git_attr_file__lookup_one(
 /* loop over rules in file from bottom to top */
 #define git_attr_file__foreach_matching_rule(file, path, iter, rule)	\
 	git_vector_rforeach(&(file)->rules, (iter), (rule)) \
-		if (git_attr_rule__match_path((rule), (path)) == GIT_SUCCESS)
+		if (git_attr_rule__match((rule), (path)) == GIT_SUCCESS)
 
 extern unsigned long git_attr_file__name_hash(const char *name);
 
@@ -87,9 +88,17 @@ extern unsigned long git_attr_file__name_hash(const char *name);
  * other utilities
  */
 
+extern int git_attr_fnmatch__parse(
+	git_attr_fnmatch *spec,
+	const char **base);
+
+extern int git_attr_fnmatch__match(
+	git_attr_fnmatch *rule,
+	const git_attr_path *path);
+
 extern void git_attr_rule__free(git_attr_rule *rule);
 
-extern int git_attr_rule__match_path(
+extern int git_attr_rule__match(
 	git_attr_rule *rule,
 	const git_attr_path *path);
 
@@ -104,7 +113,4 @@ extern int git_attr_assignment__parse(
 	git_vector *assigns,
 	const char **scan);
 
-extern int git_attr_cache__insert_macro(
-	git_repository *repo, git_attr_rule *macro);
-
 #endif

src/buffer.c

@@ -111,8 +111,10 @@ int git_buf_set(git_buf *buf, const char *data, size_t len)
 	if (len == 0 || data == NULL) {
 		git_buf_clear(buf);
 	} else {
+		if (data != buf->ptr) {
 			ENSURE_SIZE(buf, len + 1);
 			memmove(buf->ptr, data, len);
+		}
 		buf->size = len;
 		buf->ptr[buf->size] = '\0';
 	}
@@ -179,7 +181,7 @@ void git_buf_copy_cstr(char *data, size_t datasize, const git_buf *buf)
 {
 	size_t copylen;
 
-	assert(data && datasize);
+	assert(data && datasize && buf);
 
 	data[0] = '\0';
 
@@ -205,7 +207,7 @@ void git_buf_consume(git_buf *buf, const char *end)
 
 void git_buf_truncate(git_buf *buf, ssize_t len)
 {
-	if (len < buf->size) {
+	if (len >= 0 && len < buf->size) {
 		buf->size = len;
 		buf->ptr[buf->size] = '\0';
 	}

src/buffer.h

@@ -102,9 +102,16 @@ GIT_INLINE(const char *) git_buf_cstr(git_buf *buf)
 	return buf->ptr;
 }
 
-
 void git_buf_copy_cstr(char *data, size_t datasize, const git_buf *buf);
 
 #define git_buf_PUTS(buf, str) git_buf_put(buf, str, sizeof(str) - 1)
 
+GIT_INLINE(int) git_buf_rfind_next(git_buf *buf, char ch)
+{
+	int idx = buf->size - 1;
+	while (idx >= 0 && buf->ptr[idx] == ch) idx--;
+	while (idx >= 0 && buf->ptr[idx] != ch) idx--;
+	return idx;
+}
+
 #endif

src/fileops.c

@@ -534,3 +534,28 @@ int git_futils_find_system_file(git_buf *path, const char *filename)
 #endif
 }
 
+int git_futils_dir_for_path(git_buf *dir, const char *path, const char *base)
+{
+	int error = GIT_SUCCESS;
+
+	if (base != NULL && git_path_root(path) < 0)
+		error = git_buf_joinpath(dir, base, path);
+	else
+		error = git_buf_sets(dir, path);
+
+	if (error == GIT_SUCCESS) {
+		char buf[GIT_PATH_MAX];
+		if (p_realpath(dir->ptr, buf) != NULL)
+			error = git_buf_sets(dir, buf);
+	}
+
+	/* call dirname if this is not a directory */
+	if (error == GIT_SUCCESS && git_futils_isdir(dir->ptr) != GIT_SUCCESS)
+		if (git_path_dirname_r(dir, dir->ptr) < GIT_SUCCESS)
+			error = git_buf_lasterror(dir);
+
+	if (error == GIT_SUCCESS)
+		error = git_path_to_dir(dir);
+
+	return error;
+}

src/fileops.h

@@ -102,6 +102,16 @@ extern int git_futils_mkpath2file(const char *path, const mode_t mode);
 extern int git_futils_rmdir_r(const char *path, int force);
 
 /**
+ * Get the directory for a path.
+ *
+ * If the path is a directory, this does nothing (save append a '/' as
+ * needed).  If path is a normal file, this gets the directory containing
+ * it.  If the path does not exist, then this treats it a filename and
+ * returns the dirname of it.
+ */
+extern int git_futils_dir_for_path(git_buf *dir, const char *path, const char *base);
+
+/**
  * Create and open a temporary file with a `_git2_` suffix.
  * Writes the filename into path_out.
  * @return On success, an open file descriptor, else an error code < 0.

src/ignore.c

+#include "ignore.h"
+#include "path.h"
+#include "git2/config.h"
+
+#define GIT_IGNORE_INTERNAL		"[internal]exclude"
+#define GIT_IGNORE_FILE_INREPO	"info/exclude"
+#define GIT_IGNORE_FILE			".gitignore"
+#define GIT_IGNORE_CONFIG		"core.excludesfile"
+
+static int load_ignore_file(
+	git_repository *GIT_UNUSED(repo), const char *path, git_attr_file **out)
+{
+	int error = GIT_SUCCESS;
+	git_fbuffer fbuf = GIT_FBUFFER_INIT;
+	git_attr_file *ignores = NULL;
+	git_attr_fnmatch *match = NULL;
+	const char *scan = NULL;
+
+	GIT_UNUSED_ARG(repo);
+
+	*out = NULL;
+
+	if ((error = git_futils_readbuffer(&fbuf, path)) == GIT_SUCCESS)
+		error = git_attr_file__new(&ignores);
+
+	ignores->path = git__strdup(path);
+
+	scan = fbuf.data;
+
+	while (error == GIT_SUCCESS && *scan) {
+		if (!match && !(match = git__calloc(1, sizeof(git_attr_fnmatch)))) {
+			error = GIT_ENOMEM;
+			break;
+		}
+
+		if (!(error = git_attr_fnmatch__parse(match, &scan))) {
+			match->flags = match->flags | GIT_ATTR_FNMATCH_IGNORE;
+			scan = git__next_line(scan);
+			error = git_vector_insert(&ignores->rules, match);
+		}
+
+		if (error != GIT_SUCCESS) {
+			git__free(match->pattern);
+			match->pattern = NULL;
+
+			if (error == GIT_ENOTFOUND)
+				error = GIT_SUCCESS;
+		} else {
+			match = NULL; /* vector now "owns" the match */
+		}
+	}
+
+	git_futils_freebuffer(&fbuf);
+	git__free(match);
+
+	if (error != GIT_SUCCESS) {
+		git__rethrow(error, "Could not open ignore file '%s'", path);
+		git_attr_file__free(ignores);
+	} else {
+		*out = ignores;
+	}
+
+	return error;
+}
+
+#define push_ignore(R,S,B,F) \
+	git_attr_cache__push_file((R),(S),(B),(F),load_ignore_file)
+
+typedef struct {
+	git_repository *repo;
+	git_vector *stack;
+} ignore_walk_up_info;
+
+static int push_one_ignore(void *ref, git_buf *path)
+{
+	ignore_walk_up_info *info = (ignore_walk_up_info *)ref;
+	return push_ignore(info->repo, info->stack, path->ptr, GIT_IGNORE_FILE);
+}
+
+int git_ignore__for_path(git_repository *repo, const char *path, git_vector *stack)
+{
+	int error = GIT_SUCCESS;
+	git_buf dir = GIT_BUF_INIT;
+	git_config *cfg;
+	const char *workdir = git_repository_workdir(repo);
+	ignore_walk_up_info info;
+
+	if ((error = git_attr_cache__init(repo)) < GIT_SUCCESS)
+		goto cleanup;
+
+	if ((error = git_futils_dir_for_path(&dir, path, workdir)) < GIT_SUCCESS)
+		goto cleanup;
+
+	/* insert internals */
+	if ((error = push_ignore(repo, stack, NULL, GIT_IGNORE_INTERNAL)) < GIT_SUCCESS)
+		goto cleanup;
+
+	/* load .gitignore up the path */
+	info.repo = repo;
+	info.stack = stack;
+	if ((error = git_path_walk_up(&dir, workdir, push_one_ignore, &info)) < GIT_SUCCESS)
+		goto cleanup;
+
+	/* load .git/info/exclude */
+	if ((error = push_ignore(repo, stack, repo->path_repository, GIT_IGNORE_FILE_INREPO)) < GIT_SUCCESS)
+		goto cleanup;
+
+	/* load core.excludesfile */
+	if ((error = git_repository_config(&cfg, repo)) == GIT_SUCCESS) {
+		const char *core_ignore;
+		error = git_config_get_string(cfg, GIT_IGNORE_CONFIG, &core_ignore);
+		if (error == GIT_SUCCESS && core_ignore != NULL)
+			error = push_ignore(repo, stack, NULL, core_ignore);
+		else {
+			error = GIT_SUCCESS;
+			git_clearerror(); /* don't care if attributesfile is not set */
+		}
+		git_config_free(cfg);
+	}
+
+cleanup:
+	if (error < GIT_SUCCESS)
+		git__rethrow(error, "Could not get ignore files for '%s'", path);
+
+	git_buf_free(&dir);
+
+	return error;
+}
+
+void git_ignore__free(git_vector *stack)
+{
+	git_vector_free(stack);
+}
+
+int git_ignore__lookup(git_vector *stack, const char *pathname, int *ignored)
+{
+	int error;
+	unsigned int i, j;
+	git_attr_file *file;
+	git_attr_path path;
+	git_attr_fnmatch *match;
+
+	if ((error = git_attr_path__init(&path, pathname)) < GIT_SUCCESS)
+		return git__rethrow(error, "Could not get attribute for '%s'", pathname);
+
+	*ignored = 0;
+
+	git_vector_foreach(stack, i, file) {
+		git_vector_rforeach(&file->rules, j, match) {
+			if (git_attr_fnmatch__match(match, &path) == GIT_SUCCESS) {
+				*ignored = ((match->flags & GIT_ATTR_FNMATCH_NEGATIVE) == 0);
+				goto found;
+			}
+		}
+	}
+found:
+
+	return error;
+}

src/ignore.h

+/*
+ * Copyright (C) 2009-2011 the libgit2 contributors
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+#ifndef INCLUDE_ignore_h__
+#define INCLUDE_ignore_h__
+
+#include "repository.h"
+#include "vector.h"
+
+extern int git_ignore__for_path(git_repository *repo, const char *path, git_vector *stack);
+extern void git_ignore__free(git_vector *stack);
+extern int git_ignore__lookup(git_vector *stack, const char *path, int *ignored);
+
+#endif

src/path.c

@@ -305,3 +305,47 @@ int git_path_fromurl(git_buf *local_path_out, const char *file_url)
 
 	return error;
 }
+
+int git_path_walk_up(
+	git_buf *path,
+	const char *ceiling,
+	int (*cb)(void *data, git_buf *),
+	void *data)
+{
+	int error = GIT_SUCCESS;
+	git_buf iter;
+	ssize_t stop = 0, scan;
+	char oldc = '\0';
+
+	assert(path && cb);
+
+	if (ceiling != NULL) {
+		if (git__prefixcmp(path->ptr, ceiling) == GIT_SUCCESS)
+			stop = (ssize_t)strlen(ceiling);
+		else
+			stop = path->size;
+	}
+	scan = path->size;
+
+	iter.ptr = path->ptr;
+	iter.size = path->size;
+	iter.asize = path->asize;
+
+	while (scan >= stop) {
+		if ((error = cb(data, &iter)) < GIT_SUCCESS)
+			break;
+		iter.ptr[scan] = oldc;
+		scan = git_buf_rfind_next(&iter, '/');
+		if (scan >= 0) {
+			scan++;
+			oldc = iter.ptr[scan];
+			iter.size = scan;
+			iter.ptr[scan] = '\0';
+		}
+	}
+
+	if (scan >= 0)
+		iter.ptr[scan] = oldc;
+
+	return error;
+}

src/path.h

@@ -77,4 +77,18 @@ GIT_INLINE(void) git_path_mkposix(char *path)
 extern int git__percent_decode(git_buf *decoded_out, const char *input);
 extern int git_path_fromurl(git_buf *local_path_out, const char *file_url);
 
+/**
+ * Invoke callback directory by directory up the path until the ceiling
+ * is reached (inclusive of a final call at the root_path).
+ *
+ * If the ceiling is NULL, this will walk all the way up to the root.
+ * If the ceiling is not a prefix of the path, the callback will be
+ * invoked a single time on the verbatim input path.  Returning anything
+ * other than GIT_SUCCESS from the callback function will stop the
+ * iteration and propogate the error to the caller.
+ */
+extern int git_path_walk_up(
+	git_buf *path, const char *ceiling,
+	int (*cb)(void *data, git_buf *), void *data);
+
 #endif

src/repository.h

@@ -19,7 +19,7 @@
 #include "refs.h"
 #include "buffer.h"
 #include "odb.h"
-#include "attr_file.h"
+#include "attr.h"
 
 #define DOT_GIT ".git"
 #define GIT_DIR DOT_GIT "/"

src/util.h

@@ -102,6 +102,13 @@ extern char *git__strtok(char **end, const char *sep);
 extern void git__strntolower(char *str, size_t len);
 extern void git__strtolower(char *str);
 
+GIT_INLINE(const char *) git__next_line(const char *s)
+{
+	while (*s && *s != '\n') s++;
+	while (*s == '\n' || *s == '\r') s++;
+	return s;
+}
+
 extern int git__fnmatch(const char *pattern, const char *name, int flags);
 
 extern void git__tsort(void **dst, size_t size, int (*cmp)(const void *, const void *));

tests-clay/attr/repo.c

@@ -57,6 +57,7 @@ void test_attr_repo__get_one(void)
 		{ "subdir/subdir_test2.txt", "subattr", "yes" },
 		{ "subdir/subdir_test2.txt", "negattr", GIT_ATTR_FALSE },
 		{ "subdir/subdir_test2.txt", "another", "one" },
+		{ "does-not-exist", "foo", "yes" },
 		{ NULL, NULL, NULL }
 	}, *scan;
 

tests-clay/core/path.c

@@ -336,3 +336,55 @@ void test_core_path__10_fromurl(void)
 	check_fromurl(ABS_PATH_MARKER "c:/Temp+folder/note.txt", "file:///c:/Temp+folder/note.txt", 0);
 	check_fromurl(ABS_PATH_MARKER "a", "file:///a", 0);
 }
+
+typedef struct {
+	int expect_idx;
+	char **expect;
+} check_walkup_info;
+
+static int check_one_walkup_step(void *ref, git_buf *path)
+{
+	check_walkup_info *info = (check_walkup_info *)ref;
+	cl_assert(info->expect[info->expect_idx] != NULL);
+	cl_assert_strequal(info->expect[info->expect_idx], path->ptr);
+	info->expect_idx++;
+	return GIT_SUCCESS;
+}
+
+void test_core_path__11_walkup(void)
+{
+	git_buf p = GIT_BUF_INIT;
+	char *expect[] = {
+		"/a/b/c/d/e/", "/a/b/c/d/", "/a/b/c/", "/a/b/", "/a/", "/", NULL,
+		"/a/b/c/d/e", "/a/b/c/d/", "/a/b/c/", "/a/b/", "/a/", "/", NULL,
+		"/a/b/c/d/e", "/a/b/c/d/", "/a/b/c/", "/a/b/", "/a/", "/", NULL,
+		"/a/b/c/d/e", "/a/b/c/d/", "/a/b/c/", "/a/b/", "/a/", "/", NULL,
+		"/a/b/c/d/e", "/a/b/c/d/", "/a/b/c/", "/a/b/", NULL,
+		"/a/b/c/d/e", "/a/b/c/d/", "/a/b/c/", "/a/b/", NULL,
+		"this is a path", NULL,
+		"///a///b///c///d///e///", "///a///b///c///d///", "///a///b///c///", "///a///b///", "///a///", "///", NULL,
+		NULL
+	};
+	char *root[] = { NULL, NULL, "/", "", "/a/b", "/a/b/", NULL, NULL, NULL };
+	int i, j;
+	check_walkup_info info;
+
+	info.expect = expect;
+
+	for (i = 0, j = 0; expect[i] != NULL; i++, j++) {
+
+		git_buf_sets(&p, expect[i]);
+
+		info.expect_idx = i;
+		cl_git_pass(
+			git_path_walk_up(&p, root[j], check_one_walkup_step, &info)
+		);
+
+		cl_assert_strequal(p.ptr, expect[i]);
+
+		/* skip to next run of expectations */
+		while (expect[i] != NULL) i++;
+	}
+
+	git_buf_free(&p);
+}

tests-clay/status/status_data.h

@@ -10,6 +10,7 @@ struct status_entry_counts {
 
 static const char *entry_paths0[] = {
 	"file_deleted",
+	"ignored_file",
 	"modified_file",
 	"new_file",
 	"staged_changes",
@@ -28,6 +29,7 @@ static const char *entry_paths0[] = {
 
 static const unsigned int entry_statuses0[] = {
 	GIT_STATUS_WT_DELETED,
+	GIT_STATUS_IGNORED,
 	GIT_STATUS_WT_MODIFIED,
 	GIT_STATUS_WT_NEW,
 	GIT_STATUS_INDEX_MODIFIED,
@@ -44,5 +46,5 @@ static const unsigned int entry_statuses0[] = {
 	GIT_STATUS_WT_NEW,
 };
 
-static const size_t entry_count0 = 14;
+static const size_t entry_count0 = 15;
 

tests-clay/status/worktree.c

 #include "clay_libgit2.h"
 #include "fileops.h"
+#include "ignore.h"
 #include "status_data.h"
 
 
@@ -122,3 +123,32 @@ void test_status_worktree__empty_repository(void)
 	git_status_foreach(_repository, cb_status__count, &count);
 	cl_assert(count == 0);
 }
+
+void test_status_worktree__single_file(void)
+{
+	int i;
+	unsigned int status_flags;
+
+	for (i = 0; i < (int)entry_count0; i++) {
+		cl_git_pass(
+			git_status_file(&status_flags, _repository, entry_paths0[i])
+		);
+		cl_assert(entry_statuses0[i] == status_flags);
+	}
+}
+
+void test_status_worktree__ignores(void)
+{
+	int i, ignored;
+
+	for (i = 0; i < (int)entry_count0; i++) {
+		cl_git_pass(git_status_should_ignore(_repository, entry_paths0[i], &ignored));
+		cl_assert(ignored == (entry_statuses0[i] == GIT_STATUS_IGNORED));
+	}
+
+	cl_git_pass(git_status_should_ignore(_repository, "nonexistent_file", &ignored));
+	cl_assert(!ignored);
+
+	cl_git_pass(git_status_should_ignore(_repository, "ignored_nonexistent_file", &ignored));
+	cl_assert(ignored);
+}

tests/resources/attr/gitattributes

@@ -3,6 +3,7 @@ root_test2 -rootattr
 root_test3 !rootattr
 binfile	   		   binary
 abc		foo bar baz
+does-not-exist foo=yes
 
 root_test2 multiattr
 root_test3 multi2=foo

tests/resources/status/.gitted/info/exclude

@@ -4,3 +4,5 @@
 # exclude patterns (uncomment them if you want to use them):
 # *.[oa]
 # *~
+ignored*
+

tests/resources/status/ignored_file

+ignored_file

tests/t18-status.c

@@ -64,6 +64,7 @@ END_TEST
 
 static const char *entry_paths0[] = {
 	"file_deleted",
+	"ignored_file",
 	"modified_file",
 	"new_file",
 	"staged_changes",
@@ -82,6 +83,7 @@ static const char *entry_paths0[] = {
 
 static const unsigned int entry_statuses0[] = {
 	GIT_STATUS_WT_DELETED,
+	GIT_STATUS_IGNORED,
 	GIT_STATUS_WT_MODIFIED,
 	GIT_STATUS_WT_NEW,
 	GIT_STATUS_INDEX_MODIFIED,
@@ -98,7 +100,7 @@ static const unsigned int entry_statuses0[] = {
 	GIT_STATUS_WT_NEW,
 };
 
-#define ENTRY_COUNT0 14
+#define ENTRY_COUNT0 15
 
 struct status_entry_counts {
 	int wrong_status_flags_count;
@@ -185,6 +187,7 @@ END_TEST
 static const char *entry_paths2[] = {
 	"current_file",
 	"file_deleted",
+	"ignored_file",
 	"modified_file",
 	"staged_changes",
 	"staged_changes_file_deleted",
@@ -202,6 +205,7 @@ static const char *entry_paths2[] = {
 static const unsigned int entry_statuses2[] = {
 	GIT_STATUS_WT_DELETED,
 	GIT_STATUS_WT_DELETED,
+	GIT_STATUS_IGNORED,
 	GIT_STATUS_WT_DELETED,
 	GIT_STATUS_WT_DELETED | GIT_STATUS_INDEX_MODIFIED,
 	GIT_STATUS_WT_DELETED | GIT_STATUS_INDEX_MODIFIED,
@@ -216,7 +220,7 @@ static const unsigned int entry_statuses2[] = {
 	GIT_STATUS_WT_DELETED,
 };
 
-#define ENTRY_COUNT2 14
+#define ENTRY_COUNT2 15
 
 BEGIN_TEST(statuscb2, "test retrieving status for a purged worktree of an valid repository")
 	git_repository *repo;
@@ -261,6 +265,7 @@ static const char *entry_paths3[] = {
 	"current_file/modified_file",
 	"current_file/new_file",
 	"file_deleted",
+	"ignored_file",
 	"modified_file",
 	"new_file",
 	"staged_changes",
@@ -286,6 +291,7 @@ static const unsigned int entry_statuses3[] = {
 	GIT_STATUS_WT_NEW,
 	GIT_STATUS_WT_NEW,
 	GIT_STATUS_WT_DELETED,
+	GIT_STATUS_IGNORED,
 	GIT_STATUS_WT_MODIFIED,
 	GIT_STATUS_WT_NEW,
 	GIT_STATUS_INDEX_MODIFIED,
@@ -302,7 +308,7 @@ static const unsigned int entry_statuses3[] = {
 	GIT_STATUS_WT_DELETED,
 };
 
-#define ENTRY_COUNT3 22
+#define ENTRY_COUNT3 23
 
 BEGIN_TEST(statuscb3, "test retrieving status for a worktree where a file and a subdir have been renamed and some files have been added")
 	git_repository *repo;