188 lines
4.9 KiB
Rust
188 lines
4.9 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,
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fs::File,
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io::{
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Read,
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stdin,
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},
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iter::Peekable,
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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 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::Table(table) => {
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match tabkey.peek() {
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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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None => {}, // out.push_str(table.as_str()),
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};
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},
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_ => {
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match tabkey.peek() {
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Some(_) => {
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return Err((format!("{}: Not a table.", item), EX_DATAERR));
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},
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None => {},
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};
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},
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};
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match value {
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Value::Array(array) => { // TODO: Split Array logic into separate function
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let element: String;
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match index {
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Some(i) => {
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element = match array.get(i) {
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Some(element) => {
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match element.as_str() {
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Some(val) => val.to_owned(),
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None => {
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return Err((
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format!("{:?}: No value at given key.", i),
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EX_DATAERR
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));
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},
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}
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},
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None => {
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return Err(
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(format!("{:?}: No value at given index.", i), EX_DATAERR)
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);
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},
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};
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},
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None => element = format!("{:?}", array),
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};
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out.push_str(&element);
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},
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Value::Boolean(boolean) => out.push_str(&format!("{:?}", boolean)),
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Value::Datetime(datetime) => out.push_str(&format!("{:?}", datetime)),
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Value::Float(float) => out.push_str(&format!("{:?}", float)),
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Value::Integer(int) => out.push_str(&format!("{:?}", int)),
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Value::String(string) => out.push_str(string.as_str()),
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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> = env::args().collect();
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if argv.len() <= 1 {
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eprintln!("Usage: {} [table...].[value[index]] [file...]", argv[0]);
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exit(64); // sysexits(3) EX_USAGE
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}
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let input = match argv.get(2) {
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Some(val) => val,
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None => {
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eprintln!("Usage: {} [table...].[value[index]] [file...]", argv[0]);
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exit(EX_USAGE);
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},
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};
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let mut content = Vec::new();
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let file = Path::new(&input);
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if input == &"-" {
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match stdin().lock().read_to_end(&mut content) {
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Ok(_) => {},
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Err(_) => {
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eprintln!("{}: Could not read from standard input.", argv[0]);
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exit(EX_OSERR);
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},
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};
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} else {
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match File::open(file).unwrap().read_to_end(&mut content) {
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Ok(_) => {},
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Err(_) => {
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eprintln!("{}: {:?}: No such file or directory.", argv[0], file);
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exit(EX_UNAVAILABLE);
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},
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};
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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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match tabkey.iter().skip(1).peekable().peek() {
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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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None => {},
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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 = match String::from_utf8(content).unwrap().parse::<Value>() {
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Ok(toml) => toml,
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Err(_) => {
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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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};
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let valiter = tabkey.iter().peekable();
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println!(
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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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