diff options
Diffstat (limited to 'config.h')
| -rw-r--r-- | config.h | 335 |
1 files changed, 335 insertions, 0 deletions
@@ -4,6 +4,22 @@ #include "hashmap.h" #include "string-list.h" + +/** + * The config API gives callers a way to access Git configuration files + * (and files which have the same syntax). + * + * General Usage + * ------------- + * + * Config files are parsed linearly, and each variable found is passed to a + * caller-provided callback function. The callback function is responsible + * for any actions to be taken on the config option, and is free to ignore + * some options. It is not uncommon for the configuration to be parsed + * several times during the run of a Git program, with different callbacks + * picking out different variables useful to themselves. + */ + struct object_id; /* git_config_parse_key() returns these negated: */ @@ -71,9 +87,34 @@ struct config_options { } error_action; }; +/** + * A config callback function takes three parameters: + * + * - the name of the parsed variable. This is in canonical "flat" form: the + * section, subsection, and variable segments will be separated by dots, + * and the section and variable segments will be all lowercase. E.g., + * `core.ignorecase`, `diff.SomeType.textconv`. + * + * - the value of the found variable, as a string. If the variable had no + * value specified, the value will be NULL (typically this means it + * should be interpreted as boolean true). + * + * - a void pointer passed in by the caller of the config API; this can + * contain callback-specific data + * + * A config callback should return 0 for success, or -1 if the variable + * could not be parsed properly. + */ typedef int (*config_fn_t)(const char *, const char *, void *); + int git_default_config(const char *, const char *, void *); + +/** + * Read a specific file in git-config format. + * This function takes the same callback and data parameters as `git_config`. + */ int git_config_from_file(config_fn_t fn, const char *, void *); + int git_config_from_file_with_options(config_fn_t fn, const char *, void *, const struct config_options *); @@ -88,34 +129,157 @@ void git_config_push_parameter(const char *text); int git_config_from_parameters(config_fn_t fn, void *data); void read_early_config(config_fn_t cb, void *data); void read_very_early_config(config_fn_t cb, void *data); + +/** + * Most programs will simply want to look up variables in all config files + * that Git knows about, using the normal precedence rules. To do this, + * call `git_config` with a callback function and void data pointer. + * + * `git_config` will read all config sources in order of increasing + * priority. Thus a callback should typically overwrite previously-seen + * entries with new ones (e.g., if both the user-wide `~/.gitconfig` and + * repo-specific `.git/config` contain `color.ui`, the config machinery + * will first feed the user-wide one to the callback, and then the + * repo-specific one; by overwriting, the higher-priority repo-specific + * value is left at the end). + */ void git_config(config_fn_t fn, void *); + +/** + * Lets the caller examine config while adjusting some of the default + * behavior of `git_config`. It should almost never be used by "regular" + * Git code that is looking up configuration variables. + * It is intended for advanced callers like `git-config`, which are + * intentionally tweaking the normal config-lookup process. + * It takes two extra parameters: + * + * - `config_source` + * If this parameter is non-NULL, it specifies the source to parse for + * configuration, rather than looking in the usual files. See `struct + * git_config_source` in `config.h` for details. Regular `git_config` defaults + * to `NULL`. + * + * - `opts` + * Specify options to adjust the behavior of parsing config files. See `struct + * config_options` in `config.h` for details. As an example: regular `git_config` + * sets `opts.respect_includes` to `1` by default. + */ int config_with_options(config_fn_t fn, void *, struct git_config_source *config_source, const struct config_options *opts); + +/** + * Value Parsing Helpers + * --------------------- + * + * The following helper functions aid in parsing string values + */ + int git_parse_ssize_t(const char *, ssize_t *); int git_parse_ulong(const char *, unsigned long *); + +/** + * Same as `git_config_bool`, except that it returns -1 on error rather + * than dying. + */ int git_parse_maybe_bool(const char *); + +/** + * Parse the string to an integer, including unit factors. Dies on error; + * otherwise, returns the parsed result. + */ int git_config_int(const char *, const char *); + int64_t git_config_int64(const char *, const char *); + +/** + * Identical to `git_config_int`, but for unsigned longs. + */ unsigned long git_config_ulong(const char *, const char *); + ssize_t git_config_ssize_t(const char *, const char *); + +/** + * Same as `git_config_bool`, except that integers are returned as-is, and + * an `is_bool` flag is unset. + */ int git_config_bool_or_int(const char *, const char *, int *); + +/** + * Parse a string into a boolean value, respecting keywords like "true" and + * "false". Integer values are converted into true/false values (when they + * are non-zero or zero, respectively). Other values cause a die(). If + * parsing is successful, the return value is the result. + */ int git_config_bool(const char *, const char *); + +/** + * Allocates and copies the value string into the `dest` parameter; if no + * string is given, prints an error message and returns -1. + */ int git_config_string(const char **, const char *, const char *); + +/** + * Similar to `git_config_string`, but expands `~` or `~user` into the + * user's home directory when found at the beginning of the path. + */ int git_config_pathname(const char **, const char *, const char *); + int git_config_expiry_date(timestamp_t *, const char *, const char *); int git_config_color(char *, const char *, const char *); int git_config_set_in_file_gently(const char *, const char *, const char *); + +/** + * write config values to a specific config file, takes a key/value pair as + * parameter. + */ void git_config_set_in_file(const char *, const char *, const char *); + int git_config_set_gently(const char *, const char *); + +/** + * write config values to `.git/config`, takes a key/value pair as parameter. + */ void git_config_set(const char *, const char *); + int git_config_parse_key(const char *, char **, int *); int git_config_key_is_valid(const char *key); int git_config_set_multivar_gently(const char *, const char *, const char *, int); void git_config_set_multivar(const char *, const char *, const char *, int); int git_config_set_multivar_in_file_gently(const char *, const char *, const char *, const char *, int); + +/** + * takes four parameters: + * + * - the name of the file, as a string, to which key/value pairs will be written. + * + * - the name of key, as a string. This is in canonical "flat" form: the section, + * subsection, and variable segments will be separated by dots, and the section + * and variable segments will be all lowercase. + * E.g., `core.ignorecase`, `diff.SomeType.textconv`. + * + * - the value of the variable, as a string. If value is equal to NULL, it will + * remove the matching key from the config file. + * + * - the value regex, as a string. It will disregard key/value pairs where value + * does not match. + * + * - a multi_replace value, as an int. If value is equal to zero, nothing or only + * one matching key/value is replaced, else all matching key/values (regardless + * how many) are removed, before the new pair is written. + * + * It returns 0 on success. + */ void git_config_set_multivar_in_file(const char *, const char *, const char *, const char *, int); + +/** + * rename or remove sections in the config file + * parameters `old_name` and `new_name` + * If NULL is passed through `new_name` parameter, + * the section will be removed from the config file. + */ int git_config_rename_section(const char *, const char *); + int git_config_rename_section_in_file(const char *, const char *, const char *); int git_config_copy_section(const char *, const char *); int git_config_copy_section_in_file(const char *, const char *, const char *); @@ -142,6 +306,30 @@ enum config_scope current_config_scope(void); const char *current_config_origin_type(void); const char *current_config_name(void); +/** + * Include Directives + * ------------------ + * + * By default, the config parser does not respect include directives. + * However, a caller can use the special `git_config_include` wrapper + * callback to support them. To do so, you simply wrap your "real" callback + * function and data pointer in a `struct config_include_data`, and pass + * the wrapper to the regular config-reading functions. For example: + * + * ------------------------------------------- + * int read_file_with_include(const char *file, config_fn_t fn, void *data) + * { + * struct config_include_data inc = CONFIG_INCLUDE_INIT; + * inc.fn = fn; + * inc.data = data; + * return git_config_from_file(git_config_include, file, &inc); + * } + * ------------------------------------------- + * + * `git_config` respects includes automatically. The lower-level + * `git_config_from_file` does not. + * + */ struct config_include_data { int depth; config_fn_t fn; @@ -169,6 +357,33 @@ int parse_config_key(const char *var, const char **subsection, int *subsection_len, const char **key); +/** + * Custom Configsets + * ----------------- + * + * A `config_set` can be used to construct an in-memory cache for + * config-like files that the caller specifies (i.e., files like `.gitmodules`, + * `~/.gitconfig` etc.). For example, + * + * ---------------------------------------- + * struct config_set gm_config; + * git_configset_init(&gm_config); + * int b; + * //we add config files to the config_set + * git_configset_add_file(&gm_config, ".gitmodules"); + * git_configset_add_file(&gm_config, ".gitmodules_alt"); + * + * if (!git_configset_get_bool(gm_config, "submodule.frotz.ignore", &b)) { + * //hack hack hack + * } + * + * when we are done with the configset: + * git_configset_clear(&gm_config); + * ---------------------------------------- + * + * Configset API provides functions for the above mentioned work flow + */ + struct config_set_element { struct hashmap_entry ent; char *key; @@ -197,16 +412,47 @@ struct config_set { struct configset_list list; }; +/** + * Initializes the config_set `cs`. + */ void git_configset_init(struct config_set *cs); + +/** + * Parses the file and adds the variable-value pairs to the `config_set`, + * dies if there is an error in parsing the file. Returns 0 on success, or + * -1 if the file does not exist or is inaccessible. The user has to decide + * if he wants to free the incomplete configset or continue using it when + * the function returns -1. + */ int git_configset_add_file(struct config_set *cs, const char *filename); + +/** + * Finds and returns the value list, sorted in order of increasing priority + * for the configuration variable `key` and config set `cs`. When the + * configuration variable `key` is not found, returns NULL. The caller + * should not free or modify the returned pointer, as it is owned by the cache. + */ const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key); + +/** + * Clears `config_set` structure, removes all saved variable-value pairs. + */ void git_configset_clear(struct config_set *cs); /* * These functions return 1 if not found, and 0 if found, leaving the found * value in the 'dest' pointer. */ + +/* + * Finds the highest-priority value for the configuration variable `key` + * and config set `cs`, stores the pointer to it in `value` and returns 0. + * When the configuration variable `key` is not found, returns 1 without + * touching `value`. The caller should not free or modify `value`, as it + * is owned by the cache. + */ int git_configset_get_value(struct config_set *cs, const char *key, const char **dest); + int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest); int git_configset_get_string(struct config_set *cs, const char *key, char **dest); int git_configset_get_int(struct config_set *cs, const char *key, int *dest); @@ -240,17 +486,94 @@ int repo_config_get_maybe_bool(struct repository *repo, int repo_config_get_pathname(struct repository *repo, const char *key, const char **dest); +/** + * Querying For Specific Variables + * ------------------------------- + * + * For programs wanting to query for specific variables in a non-callback + * manner, the config API provides two functions `git_config_get_value` + * and `git_config_get_value_multi`. They both read values from an internal + * cache generated previously from reading the config files. + */ + +/** + * Finds the highest-priority value for the configuration variable `key`, + * stores the pointer to it in `value` and returns 0. When the + * configuration variable `key` is not found, returns 1 without touching + * `value`. The caller should not free or modify `value`, as it is owned + * by the cache. + */ int git_config_get_value(const char *key, const char **value); + +/** + * Finds and returns the value list, sorted in order of increasing priority + * for the configuration variable `key`. When the configuration variable + * `key` is not found, returns NULL. The caller should not free or modify + * the returned pointer, as it is owned by the cache. + */ const struct string_list *git_config_get_value_multi(const char *key); + +/** + * Resets and invalidates the config cache. + */ void git_config_clear(void); + +/** + * Allocates and copies the retrieved string into the `dest` parameter for + * the configuration variable `key`; if NULL string is given, prints an + * error message and returns -1. When the configuration variable `key` is + * not found, returns 1 without touching `dest`. + */ int git_config_get_string_const(const char *key, const char **dest); + +/** + * Similar to `git_config_get_string_const`, except that retrieved value + * copied into the `dest` parameter is a mutable string. + */ int git_config_get_string(const char *key, char **dest); + +/** + * Finds and parses the value to an integer for the configuration variable + * `key`. Dies on error; otherwise, stores the value of the parsed integer in + * `dest` and returns 0. When the configuration variable `key` is not found, + * returns 1 without touching `dest`. + */ int git_config_get_int(const char *key, int *dest); + +/** + * Similar to `git_config_get_int` but for unsigned longs. + */ int git_config_get_ulong(const char *key, unsigned long *dest); + +/** + * Finds and parses the value into a boolean value, for the configuration + * variable `key` respecting keywords like "true" and "false". Integer + * values are converted into true/false values (when they are non-zero or + * zero, respectively). Other values cause a die(). If parsing is successful, + * stores the value of the parsed result in `dest` and returns 0. When the + * configuration variable `key` is not found, returns 1 without touching + * `dest`. + */ int git_config_get_bool(const char *key, int *dest); + +/** + * Similar to `git_config_get_bool`, except that integers are copied as-is, + * and `is_bool` flag is unset. + */ int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest); + +/** + * Similar to `git_config_get_bool`, except that it returns -1 on error + * rather than dying. + */ int git_config_get_maybe_bool(const char *key, int *dest); + +/** + * Similar to `git_config_get_string`, but expands `~` or `~user` into + * the user's home directory when found at the beginning of the path. + */ int git_config_get_pathname(const char *key, const char **dest); + int git_config_get_index_threads(int *dest); int git_config_get_untracked_cache(void); int git_config_get_split_index(void); @@ -270,7 +593,19 @@ struct key_value_info { enum config_scope scope; }; +/** + * First prints the error message specified by the caller in `err` and then + * dies printing the line number and the file name of the highest priority + * value for the configuration variable `key`. + */ NORETURN void git_die_config(const char *key, const char *err, ...) __attribute__((format(printf, 2, 3))); + +/** + * Helper function which formats the die error message according to the + * parameters entered. Used by `git_die_config()`. It can be used by callers + * handling `git_config_get_value_multi()` to print the correct error message + * for the desired value. + */ NORETURN void git_die_config_linenr(const char *key, const char *filename, int linenr); #define LOOKUP_CONFIG(mapping, var) \ |