How to resolve the algorithm Terminal control/Unicode output step by step in the Mercury programming language

Published on 12 May 2024 09:40 PM
#Mercury

How to resolve the algorithm Terminal control/Unicode output step by step in the Mercury programming language

Table of Contents

Problem Statement

The task is to check that the terminal supports Unicode output, before outputting a Unicode character. If the terminal supports Unicode, then the terminal should output a Unicode delta (U+25b3). If the terminal does not support Unicode, then an appropriate error should be raised. Note that it is permissible to use system configuration data to determine terminal capabilities if the system provides such a facility.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Terminal control/Unicode output step by step in the Mercury programming language

Source code in the mercury programming language

:- module unicode_output.
:- interface.

:- import_module io.

:- pred main(io::di, io::uo) is det.

:- implementation.

:- import_module list.
:- import_module maybe.
:- import_module string.

main(!IO) :-
    list.map_foldl(io.get_environment_var, ["LANG", "LC_ALL", "LC_CTYPE"], EnvValues, !IO),
    ( if
        list.member(EnvValue, EnvValues),
        EnvValue = yes(Lang),
        string.sub_string_search(Lang, "UTF-8", _)
    then
        io.write_string("Unicode is supported on this terminal and U+25B3 is : \u25b3\n", !IO)
    else
        io.write_string("Unicode is not supported on this terminal.\n", !IO)
    ).

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