121 lines
3.2 KiB
Rust
121 lines
3.2 KiB
Rust
/*
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* Copyright (c) 2023–2024 Emma Tebibyte <emma@tebibyte.media>
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*
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* This program is free software: you can redistribute it and/or modify it under
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* the terms of the GNU Affero General Public License as published by the Free
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* Software Foundation, either version 3 of the License, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see https://www.gnu.org/licenses/.
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*/
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use std::{
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env::args,
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io::{ Read, stdin, stdout, Write },
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process::{ Command, exit, Stdio },
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};
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extern crate getopt;
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extern crate strerror;
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extern crate sysexits;
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use getopt::{ Opt, Parser };
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use strerror::StrError;
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use sysexits::{ EX_DATAERR, EX_IOERR, EX_UNAVAILABLE, EX_USAGE };
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fn main() {
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let argv = args().collect::<Vec<String>>();
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let mut d = '␞';
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let mut arg_parser = Parser::new(&argv, "d:");
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while let Some(opt) = arg_parser.next() {
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match opt {
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Ok(Opt('d', Some(arg))) => {
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let arg_char = arg.chars().collect::<Vec<char>>();
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if arg_char.len() > 1 {
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eprintln!("{}: {}: Not a character.", argv[0], arg);
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exit(EX_USAGE);
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} else { d = arg_char[0]; }
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},
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_ => {},
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};
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}
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let index_arg = arg_parser.index();
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let command_arg = arg_parser.index() + 1;
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argv.get(command_arg).unwrap_or_else(|| {
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eprintln!("Usage: {} [-d delimiter] index command [args...]", argv[0]);
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exit(EX_USAGE);
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});
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let index = argv[index_arg].parse::<usize>().unwrap_or_else(|e| {
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eprintln!("{}: {}: {}", argv[0], argv[1], e);
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exit(EX_DATAERR);
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});
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let mut buf = String::new();
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let _ = stdin().read_to_string(&mut buf);
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let mut fields = buf.split(d).collect::<Vec<&str>>();
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let opts = argv
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.iter()
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.clone()
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.skip(command_arg + 1)
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.collect::<Vec<&String>>();
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let mut spawned = Command::new(argv.get(command_arg).unwrap())
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.args(opts)
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.stdin(Stdio::piped())
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.stdout(Stdio::piped())
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.spawn()
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.unwrap_or_else( |e| {
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eprintln!("{}: {}: {}", argv[0], argv[command_arg], e.strerror());
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exit(EX_UNAVAILABLE);
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});
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let field = fields.get(index).unwrap_or_else(|| {
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eprintln!(
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"{}: {}: No such index in input",
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argv[0],
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index.to_string(),
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);
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exit(EX_DATAERR);
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});
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if let Some(mut child_stdin) = spawned.stdin.take() {
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let _ = child_stdin.write_all(field.as_bytes());
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drop(child_stdin);
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}
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let output = spawned.wait_with_output().unwrap_or_else(|e| {
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eprintln!("{}: {}: {}", argv[0], argv[command_arg], e.strerror());
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exit(EX_IOERR);
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});
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let mut replace = output.stdout.clone();
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if replace.pop() != Some(b'\n') { replace = output.stdout; }
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let new_field = String::from_utf8(replace).unwrap_or_else(|e| {
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eprintln!("{}: {}: {}", argv[0], argv[command_arg], e);
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exit(EX_IOERR);
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});
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fields[index] = &new_field;
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stdout().write_all(
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fields.join(&d.to_string()).as_bytes()
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).unwrap_or_else(|e| {
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eprintln!("{}: {}", argv[0], e.strerror());
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exit(EX_IOERR);
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});
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}
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