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use anyhow::anyhow;
use rand::seq::IndexedRandom;
use regex::{Regex, RegexBuilder, RegexSet};
use std::collections::HashMap;
use std::io;
use std::ops::Range;
use std::path::PathBuf;
mod config;
struct Config {
patterns: Vec<Regex>,
set: RegexSet,
}
impl Config {
fn new(patterns: Vec<Regex>) -> Self {
let set = RegexSet::new(patterns.iter().map(|x| x.to_string())).unwrap();
Self { patterns, set }
}
}
struct Match {
line: String,
group: Range<usize>,
}
impl Match {
fn new(line: String, group: Range<usize>) -> Self {
Self { line, group }
}
fn prefix(&self) -> &str {
&self.line[0..self.group.start]
}
fn infix(&self) -> &str {
&self.line[self.group.clone()]
}
fn suffix(&self) -> &str {
&self.line[self.group.end..self.line.len()]
}
}
struct PatternGroup {
matches: Vec<Match>,
}
impl PatternGroup {
fn new(matches: Vec<Match>) -> Self {
Self { matches }
}
fn calculate_groups(&self) -> Vec<usize> {
let mut groups = Vec::with_capacity(self.matches.len());
groups.push(0);
for i in 1..self.matches.len() {
if self.matches[i - 1].prefix() != self.matches[i].prefix()
|| self.matches[i - 1].suffix() != self.matches[i].suffix()
{
groups.push(i);
}
}
groups
}
}
fn load_config(path: &PathBuf) -> anyhow::Result<Config> {
if !path.try_exists()? {
return Ok(default_config());
}
let groups = config::load_groups(path)?;
if let Some(patterns_str) = groups.get("groups") {
let mut patterns_regex = Vec::with_capacity(patterns_str.len());
for pattern in patterns_str {
let regex = RegexBuilder::new(pattern).size_limit(42_000).build()?;
if regex.captures_len() != 1 {
return Err(anyhow!(
"Invalid pattern {}, capture groups are not one",
pattern
));
}
patterns_regex.push(regex);
}
return Ok(Config::new(patterns_regex));
}
Ok(Config::new(vec![]))
}
fn default_config() -> Config {
Config::new(vec![Regex::new(r"part([0-9]+)").unwrap()])
}
fn get_group(config: &Config, input: &str) -> (i64, Range<usize>) {
if let Some(index) = config.set.matches(input).iter().next() {
return (
index as i64,
config.patterns[index]
.captures(input)
.unwrap()
.get(1)
.unwrap()
.range(),
);
}
(-1, 0..input.len())
}
fn print_group(matches: &[Match]) {
for m in matches {
println!("{}", m.line);
}
}
fn main() -> anyhow::Result<()> {
let xdg_dirs = xdg::BaseDirectories::new();
let config;
if let Some(config_path) = xdg_dirs.get_config_file("shuf-grp.conf") {
config = load_config(&config_path)
.unwrap_or_else(|err| panic!("Error parsing {}: {}", config_path.display(), err));
} else {
eprintln!("Using default config, create ~/.config/shuf-grp.conf");
config = default_config();
}
let stdin = io::stdin();
let mut groups = HashMap::new();
loop {
let mut buffer = String::new();
let bytes = stdin.read_line(&mut buffer)?;
if bytes == 0 {
break;
}
buffer.truncate(buffer.trim_end().len());
let (group, part) = get_group(&config, &buffer);
let m = Match::new(buffer, part);
if let std::collections::hash_map::Entry::Vacant(e) = groups.entry(group) {
e.insert(PatternGroup::new(vec![m]));
} else {
let pattern_group: &mut PatternGroup = groups.get_mut(&group).unwrap();
match pattern_group.matches.binary_search_by(|x| {
x.prefix().cmp(m.prefix()).then(
x.suffix()
.cmp(m.suffix())
.then(natord::compare(x.infix(), m.infix())),
)
}) {
Ok(pos) => pattern_group.matches.insert(pos, m),
Err(pos) => pattern_group.matches.insert(pos, m),
}
}
}
let mut indexes = Vec::<(i64, Range<usize>)>::with_capacity(groups.len());
for pattern_group in groups.iter_mut() {
let groups = pattern_group.1.calculate_groups();
for i in 1..groups.len() {
indexes.push((*pattern_group.0, groups[i - 1]..groups[i]));
}
indexes.push((
*pattern_group.0,
groups[groups.len() - 1]..pattern_group.1.matches.len(),
));
}
let mut rng = rand::rng();
for (group, range) in indexes.choose_multiple(&mut rng, indexes.len()) {
print_group(&groups.get(group).unwrap().matches[range.clone()]);
}
Ok(())
}
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