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Add Eio_unix.Stdenv.with_env for updating environments #823

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Add Eio_unix.Stdenv.with_env for updating environments #823

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21 changes: 21 additions & 0 deletions lib_eio/unix/eio_unix.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -47,4 +47,25 @@ module Stdenv = struct
debug : Eio.Debug.t;
backend_id: string;
>

let with_env
?stdin ?stdout ?stderr ?net ?domain_mgr
?process_mgr ?clock ?mono_clock ?fs ?cwd
?secure_random ?debug ?backend_id (env : base) : base
=
object
method stdin = Option.value ~default:env#stdin stdin
method stdout = Option.value ~default:env#stdout stdout
method stderr = Option.value ~default:env#stderr stderr
method net = Option.value ~default:env#net net
method domain_mgr = Option.value ~default:env#domain_mgr domain_mgr
method process_mgr = Option.value ~default:env#process_mgr process_mgr
method clock = Option.value ~default:env#clock clock
method mono_clock = Option.value ~default:env#mono_clock mono_clock
method fs = Option.value ~default:env#fs fs
method cwd = Option.value ~default:env#cwd cwd
method secure_random = Option.value ~default:env#secure_random secure_random
method debug = Option.value ~default:env#debug debug
method backend_id = Option.value ~default:env#backend_id backend_id
end
end
20 changes: 20 additions & 0 deletions lib_eio/unix/eio_unix.mli
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Expand Up @@ -89,6 +89,26 @@ module Stdenv : sig
(** The common set of features provided by all traditional operating systems (BSDs, Linux, Mac, Windows).

You can use the functions in {!Eio.Stdenv} to access these fields if you prefer. *)

val with_env :
?stdin:source_ty r ->
?stdout:sink_ty r ->
?stderr:sink_ty r ->
?net:[ `Generic | `Unix ] Eio.Net.ty r ->
?domain_mgr:Eio.Domain_manager.ty r ->
?process_mgr:Process.mgr_ty r ->
?clock:float Eio.Time.clock_ty r ->
?mono_clock:Eio.Time.Mono.ty r ->
?fs:Eio.Fs.dir_ty Eio.Path.t ->
?cwd:Eio.Fs.dir_ty Eio.Path.t ->
?secure_random:Eio.Flow.source_ty r ->
?debug:Eio.Debug.t ->
?backend_id:string ->
base ->
base
(** [with_env env] allows you to replace parts of [env] with new resources.

By default it will select the resource from [env]. *)
end

(** API for Eio backends only. *)
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