thodg/libgit2/src/ignore.c

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• Hash : 13224ea4
  Author :
  Date : 2012-02-27T04:28:31
  

  buffer: Unify `git_fbuffer` and `git_buf` This makes so much sense that I can't believe it hasn't been done before. Kill the old `git_fbuffer` and read files straight into `git_buf` objects. Also: In order to fully support 4GB files in 32-bit systems, the `git_buf` implementation has been changed from using `ssize_t` for storage and storing negative values on allocation failure, to using `size_t` and changing the buffer pointer to a magical pointer on allocation failure. Hopefully this won't break anything.

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• 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 *repo, const char *path, git_attr_file *ignores)
  {
  	int error = GIT_SUCCESS;
  	git_buf fbuf = GIT_BUF_INIT;
  	git_attr_fnmatch *match = NULL;
  	const char *scan = NULL;
  	char *context = NULL;
  
  	if (ignores->path == NULL)
  		error = git_attr_file__set_path(repo, path, ignores);
  
  	if (git__suffixcmp(ignores->path, GIT_IGNORE_FILE) == 0) {
  		context = git__strndup(ignores->path,
  			strlen(ignores->path) - strlen(GIT_IGNORE_FILE));
  		if (!context) error = GIT_ENOMEM;
  	}
  
  	if (error == GIT_SUCCESS)
  		error = git_futils_readbuffer(&fbuf, path);
  
  	scan = fbuf.ptr;
  
  	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, context, &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_buf_free(&fbuf);
  	git__free(match);
  	git__free(context);
  
  	if (error != GIT_SUCCESS)
  		git__rethrow(error, "Could not open ignore file '%s'", path);
  
  	return error;
  }
  
  #define push_ignore(R,S,B,F) \
  	git_attr_cache__push_file((R),(S),(B),(F),load_ignore_file)
  
  static int push_one_ignore(void *ref, git_buf *path)
  {
  	git_ignores *ign = (git_ignores *)ref;
  	return push_ignore(ign->repo, &ign->ign_path, path->ptr, GIT_IGNORE_FILE);
  }
  
  int git_ignore__for_path(git_repository *repo, const char *path, git_ignores *ignores)
  {
  	int error = GIT_SUCCESS;
  	git_config *cfg;
  	const char *workdir = git_repository_workdir(repo);
  
  	assert(ignores);
  
  	ignores->repo = repo;
  	git_buf_init(&ignores->dir, 0);
  	ignores->ign_internal = NULL;
  	git_vector_init(&ignores->ign_path, 8, NULL);
  	git_vector_init(&ignores->ign_global, 2, NULL);
  
  	if ((error = git_attr_cache__init(repo)) < GIT_SUCCESS)
  		goto cleanup;
  
  	if ((error = git_path_find_dir(&ignores->dir, path, workdir)) < GIT_SUCCESS)
  		goto cleanup;
  
  	/* set up internals */
  	error = git_attr_cache__lookup_or_create_file(
  		repo, GIT_IGNORE_INTERNAL, NULL, NULL, &ignores->ign_internal);
  	if (error < GIT_SUCCESS)
  		goto cleanup;
  
  	/* load .gitignore up the path */
  	error = git_path_walk_up(&ignores->dir, workdir, push_one_ignore, ignores);
  	if (error < GIT_SUCCESS)
  		goto cleanup;
  
  	/* load .git/info/exclude */
  	error = push_ignore(repo, &ignores->ign_global,
  		repo->path_repository, GIT_IGNORE_FILE_INREPO);
  	if (error < 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, &ignores->ign_global, 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_ignore__free(ignores);
  		git__rethrow(error, "Could not get ignore files for '%s'", path);
  	}
  
  	return error;
  }
  
  int git_ignore__push_dir(git_ignores *ign, const char *dir)
  {
  	int error = git_buf_joinpath(&ign->dir, ign->dir.ptr, dir);
  
  	if (error == GIT_SUCCESS)
  		error = push_ignore(
  			ign->repo, &ign->ign_path, ign->dir.ptr, GIT_IGNORE_FILE);
  
  	return error;
  }
  
  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->path) == 0)
  			git_vector_pop(&ign->ign_path);
  		git_buf_rtruncate_at_char(&ign->dir, '/');
  	}
  	return GIT_SUCCESS;
  }
  
  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 int ignore_lookup_in_rules(
  	git_vector *rules, git_attr_path *path, int *ignored)
  {
  	unsigned int j;
  	git_attr_fnmatch *match;
  
  	git_vector_rforeach(rules, j, match) {
  		if (git_attr_fnmatch__match(match, path) == GIT_SUCCESS) {
  			*ignored = ((match->flags & GIT_ATTR_FNMATCH_NEGATIVE) == 0);
  			return GIT_SUCCESS;
  		}
  	}
  
  	return GIT_ENOTFOUND;
  }
  
  int git_ignore__lookup(git_ignores *ignores, const char *pathname, int *ignored)
  {
  	int error;
  	unsigned int i;
  	git_attr_file *file;
  	git_attr_path path;
  
  	if ((error = git_attr_path__init(
  		&path, pathname, git_repository_workdir(ignores->repo))) < GIT_SUCCESS)
  		return git__rethrow(error, "Could not get attribute for '%s'", pathname);
  
  	/* first process builtins */
  	error = ignore_lookup_in_rules(
  		&ignores->ign_internal->rules, &path, ignored);
  	if (error == GIT_SUCCESS)
  		return error;
  
  	/* next process files in the path */
  	git_vector_foreach(&ignores->ign_path, i, file) {
  		error = ignore_lookup_in_rules(&file->rules, &path, ignored);
  		if (error == GIT_SUCCESS)
  			return error;
  	}
  
  	/* last process global ignores */
  	git_vector_foreach(&ignores->ign_global, i, file) {
  		error = ignore_lookup_in_rules(&file->rules, &path, ignored);
  		if (error == GIT_SUCCESS)
  			return error;
  	}
  
  	*ignored = 0;
  
  	return GIT_SUCCESS;
  }
  

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