mirror of
https://github.com/Mercury-Language/mercury.git
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9c96387183
samples/Mmakefile:
Add the beer program to list of targets.
samples/*.m:
Convert (C->T;E) to (if C then T else E).
Delete trailing whitespace.
Use predmode syntax instead of separate pred and mode
declarations.
samples/interpreter.m:
Fix up one predicate that had some clauses that used
DCGs and others that used state variables.
Don't use the name 'IO' for something that isn't the I/O state.
samples/diff/*.m:
samples/c_interface/c_calls_mercury/mercury_main.m:
samples/c_interface/short_example.m:
Delete trailing whitespace.
95 lines
2.5 KiB
Mathematica
95 lines
2.5 KiB
Mathematica
%-----------------------------------------------------------------------------%
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% vim: ft=mercury ts=4 sw=4 et
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%-----------------------------------------------------------------------------%
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%
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% Simple implementation of the standard unix `cat' filter:
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% copy input files (or stdin, if no input files) to stdout.
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%
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% This source file is hereby placed in the public domain. -fjh (the author).
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%
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%-----------------------------------------------------------------------------%
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:- module cat.
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:- interface.
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:- import_module io.
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:- pred main(io::di, io::uo) is det.
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%-----------------------------------------------------------------------------%
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%-----------------------------------------------------------------------------%
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:- implementation.
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:- import_module char.
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:- import_module list.
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:- import_module string.
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%-----------------------------------------------------------------------------%
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main(!IO) :-
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io.command_line_arguments(Args, !IO),
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(
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Args = [],
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cat(!IO)
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;
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Args = [_ | _],
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cat_file_list(Args, !IO)
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).
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:- pred cat_file_list(list(string)::in, io::di, io::uo) is det.
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cat_file_list([], !IO).
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cat_file_list([File | Files], !IO) :-
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cat_file(File, !IO),
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cat_file_list(Files, !IO).
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:- pred cat_file(string::in, io::di, io::uo) is det.
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cat_file(File, !IO) :-
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io.open_input(File, Result, !IO),
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(
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Result = ok(Stream),
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cat_stream(Stream, !IO),
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io.close_input(Stream, !IO)
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;
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Result = error(Error),
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io.progname("cat", Progname, !IO),
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io.error_message(Error, Message),
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io.write_strings([
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Progname, ": ",
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"error opening file `", File, "' for input:\n\t",
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Message, "\n"
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], !IO)
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).
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:- pred cat_stream(io.input_stream::in, io::di, io::uo) is det.
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cat_stream(Stream, !IO) :-
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io.set_input_stream(Stream, _OldStream, !IO),
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cat(!IO).
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:- pred cat(io::di, io::uo) is det.
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cat(!IO) :-
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io.read_line_as_string(Result, !IO),
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(
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Result = ok(Line),
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io.write_string(Line, !IO),
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cat(!IO)
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;
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Result = eof
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;
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Result = error(Error),
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io.error_message(Error, Message),
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io.input_stream_name(StreamName, !IO),
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io.progname("cat", ProgName, !IO),
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io.write_strings([
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ProgName, ": ",
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"error reading input file `", StreamName, "': \n\t",
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Message, "\n"
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], !IO)
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).
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%-----------------------------------------------------------------------------%
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