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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Read-entire-file/Mercury/read-entire-file.mercury Normal file
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:- module read_entire_file.
:- interface.
:- import_module io.
:- pred main(io::di, io::uo) is det.
:- implementation.
:- import_module string.
main(!IO) :-
io.open_input("file.txt", OpenResult, !IO),
(
OpenResult = ok(File),
io.read_file_as_string(File, ReadResult, !IO),
(
ReadResult = ok(FileContents),
io.write_string(FileContents, !IO)
;
ReadResult = error(_, IO_Error),
io.stderr_stream(Stderr, !IO),
io.write_string(Stderr, io.error_message(IO_Error) ++ "\n", !IO)
)
;
OpenResult = error(IO_Error),
io.stderr_stream(Stderr, !IO),
io.write_string(Stderr, io.error_message(IO_Error) ++ "\n", !IO)
).