172 lines
4.6 KiB
Rust
172 lines
4.6 KiB
Rust
/*
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* Copyright (c) 2022–2023 Emma Tebibyte
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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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fs::File,
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io::Read,
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iter::Peekable,
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os::fd::{ FromRawFd },
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path::Path,
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str::FromStr,
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};
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use toml::Value;
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use yacexits::*;
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fn parse_toml(
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mut root: Value,
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mut tabkey: Peekable<std::slice::Iter<'_, &str>>,
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index: Option<usize>,
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) -> Result<String, (String, u32)> {
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let mut out = String::new();
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while let Some(item) = tabkey.next() {
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let mut value = match root.get(item) {
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Some(val) => val,
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None => {
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return Err((format!("{}: No such table or key.", item), EX_DATAERR));
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},
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};
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match value {
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Value::Array(array) => {
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let i = match index {
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Some(i) => i,
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None => {
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for v in array.iter() {
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out.push_str(&format!("{}\n", v.to_string()));
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}
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continue;
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},
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};
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match array.get(i) {
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Some(val) => value = val,
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None => {
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return Err((format!("No value at index {}.", i), EX_DATAERR));
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},
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};
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},
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Value::Table(table) => {
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if tabkey.peek().is_some() {
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root = toml::Value::Table(table.to_owned());
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continue;
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};
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},
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_ => {
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if tabkey.peek().is_some() {
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return Err((format!("{}: Not a table.", item), EX_DATAERR));
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}
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},
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};
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match value {
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Value::Array(_) => {},
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Value::Boolean(boolean) => out.push_str(&format!("{:?}\n", boolean)),
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Value::Datetime(datetime) => out.push_str(&format!("{:?}\n", datetime)),
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Value::Float(float) => out.push_str(&format!("{:?}\n", float)),
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Value::Integer(int) => out.push_str(&format!("{:?}\n", int)),
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Value::String(string) => {
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let contents = string.to_owned();
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let mut lines: Vec<&str> = contents.lines().collect();
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if lines.last().unwrap().is_empty() { _ = lines.pop(); }
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for line in lines.iter() { out.push_str(&format!("{}\n", line)); }
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},
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_ => return Err((format!("{:?}: No such key.", item), EX_DATAERR)),
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};
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}
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Ok(out)
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}
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fn main() {
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let argv: Vec<String> = args().collect();
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let usage_info = format!("Usage: {} [table.]key[[index]] [file...]", argv[0]);
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if argv.len() <= 1 {
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eprintln!("{}", usage_info);
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exit(EX_USAGE);
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}
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let input = argv.get(2).unwrap_or(&"".to_owned()).to_owned();
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let mut content = Vec::new();
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match input.as_str() {
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"-" | "" => unsafe { File::from_raw_fd(0) },
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_ => {
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File::open(Path::new(&input)).unwrap_or_else(|_| {
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eprintln!(
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"{}: {}: No such file or directory.",
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argv[0],
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&input
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);
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exit(EX_UNAVAILABLE);
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})
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},
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}.read_to_end(&mut content).unwrap_or_else(|_| {
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eprintln!("{}: Could not read input.", argv[0]);
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exit(EX_OSERR);
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});
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let mut tabkey: Vec<&str> = argv[1].split(".").collect();
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let mut indexvec = Vec::new();
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let mut index: Option<usize> = None;
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if tabkey.iter().skip(1).peekable().peek().is_some() {
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indexvec = tabkey[1].split(&['[', ']'][..]).collect();
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tabkey[1] = indexvec.remove(0);
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};
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if ! indexvec.is_empty() {
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let istr = indexvec.remove(0);
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match usize::from_str(istr) {
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Ok(i) => index = Some(i),
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Err(_) => {
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eprintln!("{}: {}: Cannot index by given value.", argv[0], istr);
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exit(EX_USAGE);
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},
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};
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}
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let root = String::from_utf8(content)
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.unwrap_or_else(|_| {
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eprintln!("{}: Input is not valid UTF-8.", argv[0]);
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exit(EX_DATAERR);
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})
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.parse::<Value>()
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.unwrap_or_else(|_| {
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eprintln!("{}: Unable to parse TOML.", argv[0]);
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exit(EX_DATAERR);
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});
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let valiter = tabkey.iter().peekable();
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print!(
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"{}",
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match parse_toml(root, valiter, index) {
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Ok(val) => val,
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Err((err, code)) => {
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eprintln!("{}: {}", argv[0], err);
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exit(code);
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},
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},
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);
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}
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