151 lines
3.8 KiB
Rust
151 lines
3.8 KiB
Rust
use std::ffi::OsString;
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use std::fs;
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use std::os::unix::fs::MetadataExt;
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use std::path::{Path, PathBuf};
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#[derive(Debug)]
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pub enum Error {
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EntryNotFound(String),
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}
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#[derive(Debug, Clone)]
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pub struct Entry {
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pub name: OsString,
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pub path: PathBuf,
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pub base_dir: PathBuf,
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}
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impl Entry {
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pub fn new(path: PathBuf, name: OsString, base_dir: PathBuf) -> Entry {
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Entry {
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path,
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name,
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base_dir,
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}
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}
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pub fn read_setting(&self, setting: &str) -> Option<String> {
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let mut path = self.path.clone();
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path.set_extension(setting);
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read_or_none(&path)
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}
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}
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/// Load single entry from folder
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pub fn entry(basedir: &str, filter: impl Fn(&Path) -> bool, name: &str) -> Option<Entry> {
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let basepath = PathBuf::from(&basedir);
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let path = basepath.clone().join(name);
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if !path.exists() || !filter(&path) {
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return None;
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}
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Some(Entry::new(
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path.clone(),
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path.file_name()
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.expect("Failed to read file name")
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.to_os_string(),
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basepath,
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))
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}
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/// Loads entire database from folder
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pub fn from(path_name: &str, filter: impl Fn(&Path) -> bool) -> Result<Vec<Entry>, std::io::Error> {
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let path = PathBuf::from(&path_name);
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let mut entries = Vec::new();
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for file in path.read_dir()? {
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if file.is_err() {
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// Dismiss individual errors (in case there's a permission problem)
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// TODO: maybe print a warning? Actually a configurable error level
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// (using enum variants) should be passed to the function to configure
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// whether to continue silently or error out for individual files
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continue;
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}
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let entry = file?.path();
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if filter(&entry) {
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entries.push(Entry::new(
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entry.clone(),
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entry
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.file_name()
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.expect("Failed to read file name")
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.to_os_string(),
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path.clone(),
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));
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}
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}
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return Ok(entries);
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}
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/// Reads the file and strips whitespace (including newlines)
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/// Useful for file-based key-value store
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pub fn read_or_none(path: &Path) -> Option<String> {
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if !path.is_file() {
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return None;
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}
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match fs::read_to_string(path) {
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Ok(content) => {
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// Remove trailing space/newlines
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Some(content.trim().to_string())
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}
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Err(e) => {
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eprintln!("IO ERROR: {}", e);
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None
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}
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}
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}
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/// Returns true when the file exists and has user exec
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/// permission. Returns false otherwise.
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pub fn is_executable(path: &Path) -> bool {
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// Do not match directories
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if !path.is_file() {
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return false;
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}
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match fs::metadata(path) {
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Ok(stat) => {
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let mode = stat.mode();
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// Check user exec permission)
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if (mode & 0o100) == 0o100 {
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true
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} else {
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false
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}
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}
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Err(e) => {
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eprintln!("IO Error: {}", e);
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false
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn can_load_db() {
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let base_dir = "tests/success";
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let entries = from(base_dir, is_executable).expect("Could not load db");
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let entries_names: Vec<String> = entries
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.iter()
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.map(|x| x.name.clone().into_string().unwrap())
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.collect();
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let expected: Vec<String> = vec!["task", "symlink", "no_source"]
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.iter()
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.map(|x| x.to_string())
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.collect();
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assert_eq!(expected.len(), entries_names.len());
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for entry in expected {
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if !entries_names.contains(&entry.to_string()) {
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panic!("Could not find {}", &entry);
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}
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}
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}
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}
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