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### 5.7 libcfg

#### 5.7.1 Overview

View lcov test coverage results on http://www.gnu.org/software/liquidwar6/coverage/src/lib/cfg/index.html.

#### 5.7.2 API

— Function: int lw6cfg_parse_command_line (void * context)

> context: opaque pointer on a context

> Overwrites any existing option with command line args

> Return value: 1 if success, 0 if error

— Function: int lw6cfg_defaults (void * context)

> context: opaque pointer on a context

> Sets all values to their defaults.

> Return value: 1 if success, 0 if error

— Function: int lw6cfg_merge_env (void * cfg_context)

> cfg_context: a context returned by `lw6cfg_init`

> Overwrites any existing vale in the config with environment variables prefixed by LW6_.

> Return value: 1 if successfull, 0 if error.

— Function: int lw6cfg_load_exp (char * user_dir, int * exp)

> user_dir: the user directory

> exp: the exp (out param)

> Gets exp from file.

> Return value: 1 on success, 0 on failure

— Function: int lw6cfg_save_exp (char * user_dir, int exp)

> user_dir: the user directory

> exp: the exp

> Saves exp to file.

> Return value: 1 on success, 0 on failure

— Function: char * lw6cfg_format (char * key, char * value, lw6hlp_type_t type)

> key: the key of the value to format

> value: the value to format

> type: the type of the value to format

> Formats, converts, a given value to its cannonical representation. Booleans will be converted to true/false, strings containing integers will be stripped from junk, and so on. This is a performance killer but will ensure everything is correct.

> Return value: a newly allocated string, containing the same as the input, but reformatted the pedantic way.

— Function: char * lw6cfg_format_guess_type (char * key, char * value)

> key: the key of the value to format

> value: the value to format

> Formats, converts, a given value to its cannonical representation. Booleans will be converted to true/false, strings containing integers will be stripped from junk, and so on. This is a performance killer but will ensure everything is correct. This function will automatically guess the type of the value from its description in the help system.

> Return value: a newly allocated string, containing the same as the input, but reformatted the pedantic way.

— Function: int lw6cfg_load (void * cfg_context, char * filename)

> cfg_context: a context returned by `lw6cfg_init`

> filename: a file path, absolute or relative

> Loads the given config file, and stores its values into the current context. Parameters which are both in the config file and given as command line parameters, will be taken from the command-line.

> Return value: 1 if successfull, 0 if error.

— Function: int lw6cfg_save (void * cfg_context, char * filename)

> cfg_context: a context returned by `lw6cfg_init`

> filename: a file path, absolute or relative

> Save current options into the given config file. Before saving the file, all command line arguments will be read and will override current values. This means the saved file will contain values given as command line arguments.

> Return value: 1 if successfull, 0 if error.

— Function: void * lw6cfg_init (int argc, char * [] argv)

> argc: number of command line arguments, as given to `main`

> argv: a list of command line arguments, as given to `main`

> Initializes a config context object. This object is hidden behind an opaque void * pointer to avoid direct access to its elements.

> Return value: an opaque pointer, must be freed with `lw6cfg_quit`.

— Function: void lw6cfg_quit (void * cfg_context)

> cfg_context: a context returned by `lw6cfg_init`

> Frees a config cfg_context object. You must call this once you're done with the context.

> Return value: none.

— Function: void lw6cfg_reset (int argc, char * [] argv)

> argc: number of command line arguments, as given to `main`

> argv: a list of command line arguments, as given to `main`

> Overwrites the config file with defaults. Use this to get rid of old configurations.

— Function: int lw6cfg_test (int mode)

> mode: 0 for check only, 1 for full test

> Runs the `cfg` module test suite.

> Return value: 1 if test is successfull, 0 on error.

— Function: char * lw6cfg_unified_get_value (int argc, char * [] argv, char * key)

> argc: number of command-line args, as passed to `main`

> argv: arry of command-line args, as passed to `main`

> key: the key to query

> Unified "value" getter, which gets informations from environment variables, command line, and config file. The rules is that the command-line argument always has the last word. It will override any other value. Follows environment variables, which will be used if no command-line argument is supplied. Note that these are "LW6_" prefixed and uppercased environment variables as opposed to lowercased and "dash-separated" keys. Finally, if there's no environment variable, nor any config-file corresponding entry, the value will be searched in the config file. If there's no information in the config file, NULL is returned.

> Return value: a string with the value. Can be NULL. Must be freed.

— Function: char * lw6cfg_unified_get_user_dir (int argc, char * [] argv)

> argc: number of command-line args, as passed to `main`

> argv: arry of command-line args, as passed to `main`

> Gets the user dir, taking all parameters in account, that's to say the "LW6_USER_DIR" env value, the "–user-dir" command-line paramater and the LW6DEF_USER_DIR config file entry.

> Return value: the directory path, might be NULL, must be freed.

— Function: char * lw6cfg_unified_get_log_file (int argc, char * [] argv)

> argc: number of command-line args, as passed to `main`

> argv: arry of command-line args, as passed to `main`

> Gets the log file, taking all parameters in account, that's to say the "LW6_LOG_FILE" env value, the "–log-file" command-line paramater and the LW6DEF_LOG_FILE config file entry.

> Return value: the directory path, might be NULL, must be freed.

— Function: char * lw6cfg_unified_get_music_path (int argc, char * [] argv)

> argc: number of command-line args, as passed to `main`

> argv: arry of command-line args, as passed to `main`

> Gets the user dir, taking all parameters in account, that's to say the "LW6_MUSIC_PATH" env value, the "–music-path" command-line paramater and the LW6DEF_MUSIC_PATH config file entry.

> Return value: the directory path, might be NULL, must be freed.

— Function: char * lw6cfg_unified_get_map_path (int argc, char * [] argv)

> argc: number of command-line args, as passed to `main`

> argv: arry of command-line args, as passed to `main`

> Gets the user dir, taking all parameters in account, that's to say the "LW6_MAP_PATH" env value, the "–map-path" command-line paramater and the LW6DEF_MAP_PATH config file entry.

> Return value: the directory path, might be NULL, must be freed.