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use std::{
fs,
path::{Path, PathBuf},
str::Lines,
};
use anyhow::Result;
use super::kpsewhich::{self, Resolver};
pub fn load_resolver() -> Result<Resolver> {
let root_directories = kpsewhich::root_directories()?;
let resolver = kpsewhich::parse_database(&root_directories, read_database)?;
Ok(resolver)
}
const DATABASE_PATH: &str = "ls-R";
fn read_database(directory: &Path) -> Result<Vec<PathBuf>> {
let file = directory.join(DATABASE_PATH);
if !file.is_file() {
return Ok(Vec::new());
}
let text = fs::read_to_string(file)?;
let files = parse_database(text.lines());
Ok(files)
}
fn parse_database(lines: Lines) -> Vec<PathBuf> {
let mut paths = Vec::new();
let mut directory = "";
for line in lines.filter(|x| !x.trim().is_empty() && !x.starts_with('%')) {
if let Some(line) = line.strip_suffix(':') {
directory = line;
} else {
let path = PathBuf::from(directory).join(line);
paths.push(path);
}
}
paths
}
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