functoria 4.0.0~beta3 · OCaml Package

Configuration and runtime command-line arguments.

module Arg : sig ... end

Cross-stage command-line arguments.

Configuration Keys

type 'a key

The type for configuration keys. Keys are used to retrieve the cross-stage values they are holding (by indexing contents in the autogenerated Bootgen_var module) but also to parameterize the choice of module implementation.

val create : string -> 'a Arg.t -> 'a key

create n a is the key named n whose contents is determined by parsing the command-line argument a.

Configuration Values

type +'a value

The type for configure-time and run-time values. Values are either pure or obtained by composing other values. Values might have data dependencies, which form an (implicit) directed and acyclic graph that need to be evaluated.

val pure : 'a -> 'a value

pure x is a value without any dependency.

val ($) : ('a -> 'b) value -> 'a value -> 'b value

f $ v is is the value resulting from the application of f'value to v's value. $ is the usual app operator for applicative functor.

val map : ('a -> 'b) -> 'a value -> 'b value

map f v is pure f $ v.

val if_ : bool value -> 'a -> 'a -> 'a value

if_ v x y is map (fun b -> if b then x else y) v.

val match_ : 'a value -> ('a -> 'b) -> 'b value

match_ v pattern is map pattern v.

val default : 'a value -> 'a

default v returns the default value for v.

val value : 'a key -> 'a value

value k is the value parsed by k.

Abstract Keys

type t

The type for abstract keys.

val name : t -> string

name t is the string given as t's name when t was created.

val v : 'a key -> t

v k is the k with its type hidden.

val abstract : 'a key -> t

Deprecated, use v.

deprecated Use Functoria.Key.v.

val equal : t -> t -> bool

equal is the equality function of untyped keys.

val hash : t -> int

hash is the hash function for untyped keys.

val compare : t -> t -> int

compare compares untyped keys.

val pp : t Fmt.t

pp fmt k prints the name of k.

module Set : sig ... end

Set implements sets over t elements.

val of_deps : Set.t -> unit value

of_deps keys is a value with keys as data-dependencies.

val deps : 'a value -> Set.t

deps v are v's data-dependencies.

val pp_deps : 'a value Fmt.t

pp_deps fmt v prints the name of the dependencies of v.

Stages

val is_runtime : t -> bool

is_runtime k is true if k's stage is `Run or `Both.

val is_configure : t -> bool

is_configure k is true if k's stage is `Configure or `Both.

val filter_stage : Arg.stage -> Set.t -> Set.t

filter_stage s ks is ks but with only keys available at stage s.

module Alias : sig ... end

Alias allows to define virtual keys in terms of other keys at configuration time only.

val alias : string -> 'a Alias.t -> 'a key

Similar to create but for command-line alias.

val aliases : t -> Set.t

aliases t is the list of t's aliases.

Parsing context

type context

The type for values holding parsing context.

val dump_context : context Fmt.t

dump_context dumps the contents of a context.

val empty_context : context

val merge_context : default:context -> context -> context

val add_to_context : 'a key -> 'a -> context -> context

Add a binding to a context.

val context : 
  ?stage:Arg.stage ->
  with_required:bool ->
  Set.t ->
  context Cmdliner.Term.t

context ~with_required ks is a Cmdliner term that evaluates into a parsing context for command-line arguments. If with_required is false, it will only produce optional keys.

val mem : context -> 'a value -> bool

mem c v is true iff all the dependencies of v have been evaluated.

val peek : context -> 'a value -> 'a option

peek c v is Some x if mem v and None otherwise.

val eval : context -> 'a value -> 'a

eval c v evaluates v in c's context, using default values if necessary.

val get : context -> 'a key -> 'a

get c k is k's value in c's context. If k is not present in c, it is k's default value.

val find : context -> 'a key -> 'a option

find c k is k's value in c's context or None if k is not present in c.

val pps : context -> Set.t Fmt.t

pps c fmt ks prints the keys ks using the context c to get their value.

Code Serialization

val ocaml_name : t -> string

ocaml_name k is the ocaml name of k.

val serialize_call : t Fmt.t

serialize_call fmt k outputs Key_gen.n () to fmt, where n is k's OCaml name.

val serialize : context -> t Fmt.t

serialize ctx ppf k outputs the Cmdliner runes to parse command-line arguments represented by k at runtime.