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#### 2.5.2 Configuration parameters

A Lepton configuration parameter consists of three components:

Group

  A string which identifies the general category in which the parameter lies (e.g. which application and/or plugin).

Name

  A string which specifically identifies the parameter within the group.

Value

  The value of the parameter. This is stored as a string, but can be converted to a number of possible scalar and list types.

Groups, names and values are all case-sensitive.

#### 2.5.2.1 Configuration groups and keys

Function: config-groups cfg ¶

  Returns a list of all groups available in cfg and its parent contexts.

  Since 1.10.

Function: config-has-group? cfg group ¶

  Determines whether cfg or its parent contexts contain the specified group

  Since 1.10.

Function: config-keys cfg group ¶

  Returns a list of all keys available in the specified group in cfg and its parent contexts.

  Since 1.10.

Function: config-has-key? cfg group key ¶

  Determines whether cfg or its parent contexts contains key in the specified group.

  Since 1.10.

Function: config-remove-key! cfg group key ¶

  Removes the configuration parameter identified by the given group and key in the configuration context cfg. Returns ‘`#t`’ on success, ‘`#f`’ otherwise.

Function: config-remove-group! cfg group ¶

  Removes the configuration group identified by group and all its parameters in the configuration context cfg. Returns ‘`#t`’ on success, ‘`#f`’ otherwise.

#### 2.5.2.2 Configuration inheritance

If a configuration context does not directly specify a value for a configuration parameter, it inherits the value from its parent context.

See Context parents.

Function: config-inherited? cfg group key ¶

  Returns ‘`#f`’ if value of the configuration parameter with the given group and key is specified in the context cfg, and ‘`#t`’ if it is inherited from a parent context of cfg.

  Since 1.10.

Function: config-source cfg group key ¶

  Returns the configuration context (either cfg or one of its parent contexts) in which the configuration parameter with the given group and key has its value defined.

  Since 1.10.

#### 2.5.2.3 Configuration values

Each value is stored as a UTF-8 string in the configuration file. However, this string can be parsed a several different types. All of the following types are supported:

- Strings
- Booleans
- Exact integers
- Inexact real numbers

In addition, lists of all the above are supported.

Function: config-string cfg group key ¶

  Retrieve configuration value as a string.

  Since 1.10.

Function: config-boolean cfg group key ¶

  Retrieve configuration value as a boolean.

  Since 1.10.

Function: config-int cfg group key ¶

  Retrieve configuration value as an exact integer.

  Since 1.10.

Function: config-real cfg group key ¶

  Retrieve configuration value as an inexact real number.

  Since 1.10.

Function: config-string-list cfg group key ¶

  Retrieve configuration value as a list of strings.

  Since 1.10.

Function: config-boolean-list cfg group key ¶

  Retrieve configuration value as a list of booleans.

  Since 1.10.

Function: config-int-list cfg group key ¶

  Retrieve configuration value as a list of exact integers.

  Since 1.10.

Function: config-real-list cfg group key ¶

  Retrieve configuration value as a list of inexact real numbers.

  Since 1.10.

Function: set-config! cfg group key value ¶

  Set the configuration parameter identified by the given group and key in the configuration context cfg. The type of value to set is inferred from value. Returns cfg.

  Since 1.10.

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