package ppx_system

ppx_system

ppx_system is a syntax extension to known host operating system at compile time.

Installation

$ git clone https://github.com/Psi-Prod/ppx_system
$ opam install .

Usage

Add the following stanza to your dune file:

(library
  ...
  (preprocess
    (pps ppx_system))

Syntax

[%get_system]

Use [%get_system] to get the host system as a constructor:

# #require "ppx_system";;
# match [%get_system] with
  | Darwin -> "Darwin"
  | FreeBSD -> "FreeBSD"
  | NetBSD -> "NetBSD"
  | OpenBSD -> "OpenBSD"
  | Unix -> "Unix"
  | Win32 -> "Win32"
  | Unknown sysname -> Printf.sprintf "Unknown system: %S" sysname
- : string = "Unix"

[%system]

Five system are supported: Darwin, UNIX, Win32, FreeBSD, NetBSD, OpenBSD.

Assuming you are on UNIX:

# #require "ppx_system";;
# Printf.sprintf "You are on %s!"
    [%system
      {
        darwin = "Darwin";
        free_bsd = "FreeBSD";
        net_bsd = "NetBSD";
        open_bsd = "OpenBSD";
        unix = "UNIX";
        win32 = "Win32"
      }]
- : string = "You are on UNIX!"

# [%system { darwin = "open"; unix = "xdg-open" }];;
- : string = "xdg-open"

Use the default field to set a default value if your system is not precised:

# [%system { free_bsd = "On FreeBSD"; default = "Not on FreeBSD" }];;
- : string = "Not on FreeBSD"

An empty string is generated in case none of the provided field match the host system:

# [%system { darwin = "Darwin" }];;
- : string = ""

Contributing

Pull requests, bug reports, and feature requests are welcome.

License

• GPL 3.0 or later. See license for more information.