package irmin

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package irmin
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Backend configuration.

A backend configuration is a set of keys mapping to typed values. Backends define their own keys.

Configuration converters

A configuration converter transforms a string value to an OCaml value and vice-versa. There are a few built-in converters.

type 'a parser = string -> ('a, [ `Msg of string ]) result

The type for configuration converter parsers.

type 'a printer = 'a Fmt.t

The type for configuration converter printers.

type 'a converter = 'a parser * 'a printer

The type for configuration converters.

val parser : 'a converter -> 'a parser

parser c is c's parser.

val printer : 'a converter -> 'a printer

converter c is c's printer.

Keys

type 'a key

The type for configuration keys whose lookup value is 'a.

val key : ?docs:string -> ?docv:string -> ?doc:string -> string -> 'a converter -> 'a -> 'a key

key ~docs ~docv ~doc name conv default is a configuration key named name that maps to value default by default. conv is used to convert key values provided by end users.

docs is the title of a documentation section under which the key is documented. doc is a short documentation string for the key, this should be a single sentence or paragraph starting with a capital letter and ending with a dot. docv is a meta-variable for representing the values of the key (e.g. "BOOL" for a boolean).

  • raises Invalid_argument

    if the key name is not made of a sequence of ASCII lowercase letter, digit, dash or underscore.

    Warning. No two keys should share the same name as this may lead to difficulties in the UI.

val name : 'a key -> string

The key name.

val conv : 'a key -> 'a converter

tc k is k's converter.

val default : 'a key -> 'a

default k is k's default value.

val doc : 'a key -> string option

doc k is k's documentation string (if any).

val docv : 'a key -> string option

docv k is k's value documentation meta-variable (if any).

val docs : 'a key -> string option

docs k is k's documentation section (if any).

val root : string option key

Default --root=ROOT argument.

Configurations

type t

The type for configurations.

val empty : t

empty is the empty configuration.

val singleton : 'a key -> 'a -> t

singleton k v is the configuration where k maps to v.

val is_empty : t -> bool

is_empty c is true iff c is empty.

val mem : t -> 'a key -> bool

mem c k is true iff k has a mapping in c.

val add : t -> 'a key -> 'a -> t

add c k v is c with k mapping to v.

val rem : t -> 'a key -> t

rem c k is c with k unbound.

val union : t -> t -> t

union r s is the union of the configurations r and s.

val find : t -> 'a key -> 'a option

find c k is k's mapping in c, if any.

val get : t -> 'a key -> 'a

get c k is k's mapping in c.

Raises. Not_found if k is not bound in d.

Built-in value converters

val bool : bool converter

bool converts values with bool_of_string.

val int : int converter

int converts values with int_of_string.

val string : string converter

string converts values with the identity function.

val uri : Uri.t converter

uri converts values with Uri.of_string.

val some : 'a converter -> 'a option converter

string converts values with the identity function.