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(*
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* Copyright (c) 2018-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*)
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open! IStd
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let utf8 =
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let rec from_vars = function
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| [] ->
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false
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| var :: otherwise -> (
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match Sys.getenv var with
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| Some ("C" | "POSIX") ->
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false
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| None | Some "" ->
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from_vars otherwise
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| Some lc ->
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String.is_suffix lc ~suffix:"UTF-8" )
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in
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from_vars ["LC_ALL"; "LC_CTYPE"; "LANG"]
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let dot_operator = if utf8 then "⋅" else "."
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let down_tack = if utf8 then "⊤" else "T"
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let leftwards_double_arrow = if utf8 then "⇐" else "<="
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let multiplication_sign = if utf8 then "×" else "x"
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let right_tack = if utf8 then "⊢" else "|-"
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let superscript_digits =
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if utf8 then ("", [|"⁰"; "¹"; "²"; "³"; "⁴"; "⁵"; "⁶"; "⁷"; "⁸"; "⁹"|])
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else ("^", [|"0"; "1"; "2"; "3"; "4"; "5"; "6"; "7"; "8"; "9"|])
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let up_tack = if utf8 then "⊥" else "_|_"
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