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oaspec

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Generate Gleam code from OpenAPI 3.x specifications

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oaspec src oaspec_ffi.erl
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src/oaspec_ffi.erl 

-module(oaspec_ffi).

-export([find_executable/1, run_executable/2, is_stdout_tty/0, no_color_set/0]).



%% Find an executable on PATH. Returns {ok, Path} or {error, nil}.

-spec find_executable(binary()) -> {ok, binary()} | {error, nil}.

find_executable(Name) ->

    case os:find_executable(binary_to_list(Name)) of

        false -> {error, nil};

        Path -> {ok, list_to_binary(Path)}

    end.



%% Run an executable with arguments. Returns the exit code as an integer.

%% Uses spawn_executable to avoid shell injection.

-spec run_executable(binary(), list(binary())) -> integer().

run_executable(Executable, Args) ->

    Port = open_port(

        {spawn_executable, binary_to_list(Executable)},

        [exit_status, stderr_to_stdout, binary, {args, [binary_to_list(A) || A <- Args]}]

    ),

    collect_exit(Port).



collect_exit(Port) ->

    receive

        {Port, {data, _}} ->

            collect_exit(Port);

        {Port, {exit_status, Code}} ->

            Code

    after 60000 ->

        catch port_close(Port),

        1

    end.



%% Detect whether standard_io is connected to a terminal. io:getopts/1

%% reports a `terminal' flag for interactive sessions; non-TTY (pipe,

%% redirection, escript captured stdout) returns false or omits the key.

-spec is_stdout_tty() -> boolean().

is_stdout_tty() ->

    case io:getopts(standard_io) of

        {ok, Opts} ->

            case lists:keyfind(terminal, 1, Opts) of

                {terminal, true} -> true;

                _ -> false

            end;

        _ -> false

    end.



%% Honor the NO_COLOR convention (https://no-color.org/): an unset or

%% empty value means "do not opt out"; any non-empty value means "no

%% color".

-spec no_color_set() -> boolean().

no_color_set() ->

    case os:getenv("NO_COLOR") of

        false -> false;

        "" -> false;

        _ -> true

    end.