package b0

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Software construction and deployment kit

Install

Dune Dependency

erratique.ch Readme Changelog ISC; BSD-2-Clause License Edit opam file Versions (6)

Authors

T

The b0 programmers

Maintainers

Daniel Bünzli

Sources

b0-0.0.5.tbz

sha512=00a6868b4dfa34565d0141b335622a81a0e8d5b9e3c6dfad025dabfa3df2db2a1302b492953bbbce30c3a4406c324fcec25250a00b38f6d18a69e15605e3b07e

doc/b0.std/B0_std/Os/Env/index.html

Module `Os.Env`

Environment variables.

Variables

val find : empty_is_none:bool -> string -> string option

find ~empty_is_none name is the value of the environment variable name in the current process environment, if defined. If empty_is_none is true, None is returned if the variable value is the empty string.

val find' : 
  empty_is_none:bool ->
  (string -> ('a, string) result) ->
  string ->
  ('a option, string) result

find' ~empty_is_none parse name is like find but the value is parsed with parse. If the latter errors with Error e, Error (Fmt.str "%s env: %s" name e) is returned.

Process environement

type t = string String.Map.t

The type for process environments.

val empty : t

empty is String.Map.empty.

val override : t -> by:t -> t

override env ~by:o overrides the definitions in env by o.

val add : string -> string -> t -> t

add is String.Map.add.

val current : unit -> (t, string) result

current () is the current process environment.

Process environments as assignments

type assignments = string list

The type for environments as lists of strings of the form "var=value".

val current_assignments : unit -> (assignments, string) result

current_assignments () is the current process environment as assignments.

val of_assignments : ?init:t -> string list -> (t, string) result

of_assignments ~init ss folds over strings in ss, cuts them at the leftmost '=' character and adds the resulting pair to init (defaults to empty). If the same variable is bound more than once, the last one takes over.

val to_assignments : t -> assignments

to_assignments env is env's bindings as assignments.

On This Page

Variables
Process environement
Process environments as assignments