ansi.ml

(*
    Copyright © 2011 MLstate

    This file is part of OPA.

    OPA is free software: you can redistribute it and/or modify it under the
    terms of the GNU Affero General Public License, version 3, as published by
    the Free Software Foundation.

    OPA is distributed in the hope that it will be useful, but WITHOUT ANY
    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
    FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
    more details.

    You should have received a copy of the GNU Affero General Public License
    along with OPA. If not, see <http://www.gnu.org/licenses/>.
*)

type color =
    [ `black
    | `red
    | `green
    | `yellow
    | `blue
    | `magenta
    | `cyan
    | `white ]

let color = function
  | `black -> 0
  | `red -> 1
  | `green -> 2
  | `yellow -> 3
  | `blue -> 4
  | `magenta -> 5
  | `cyan -> 6
  | `white -> 7

let foreground c = 30 + color c
let background c = 40 + color c

let open_color_code c = Printf.sprintf "\027[%dm" (foreground c)
let close_color_code = "\027[0m"

(** all call to produce color come from here,
    so this global propertie is here to enforce that
    no any production are in color *)
let set_ignore_color, get_ignore_color =
  let __ignore_color = ref false in
  (fun b -> __ignore_color := b), (fun () -> !__ignore_color)

let print =
  if Sys.os_type = "Win32" then
    fun (_:color) s -> s
  else
    fun (c:color) s ->
      if get_ignore_color () then s else
        match c with
        | `black -> s
        | c -> Printf.sprintf "%s%s%s" (open_color_code c) s close_color_code

let string_of_color = function
  | `black -> "black"
  | `red -> "red"
  | `green -> "green"
  | `yellow -> "yellow"
  | `blue -> "blue"
  | `magenta -> "magenta"
  | `cyan -> "cyan"
  | `white -> "white"

let color_of_string = function
  | "black" -> Some `black
  | "red" -> Some `red
  | "green" -> Some `green
  | "yellow" -> Some `yellow
  | "blue" -> Some `blue
  | "magenta" -> Some `magenta
  | "cyan" -> Some `cyan
  | "white" -> Some `white
  | _ -> None

let symbols = [
  "black"; "red"; "green"; "yellow"; "blue"; "magenta"; "cyan"; "white"
]

let uncolor = function
  | 0 -> `black
  | 1 -> `red
  | 2 -> `green
  | 3 -> `yellow
  | 4 -> `blue
  | 5 -> `magenta
  | 6 -> `cyan
  | 7 -> `white
  | _ -> assert false