129 lines
3.7 KiB
Rust
129 lines
3.7 KiB
Rust
use std::fmt::{Display, Write};
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use std::hash::Hash;
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/// A struct to represent a single package, consisting of a `name`, and
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/// optionally a `repo`.
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#[derive(Debug, Eq, PartialOrd, Ord, Clone)]
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pub struct Package {
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/// The name of the package
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pub name: String,
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/// Optionally, which repository the package belongs to
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pub repo: Option<String>,
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}
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fn remove_comment_and_trim_whitespace(s: &str) -> &str {
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s.split('#') // remove comment
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.next()
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.expect("line contains something")
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.trim() // remove whitespace
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}
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impl From<String> for Package {
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fn from(value: String) -> Self {
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let trimmed = remove_comment_and_trim_whitespace(&value);
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debug_assert!(!trimmed.is_empty(), "empty package names are not allowed");
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let (name, repo) = Self::split_into_name_and_repo(trimmed);
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Self { name, repo }
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}
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}
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impl From<&str> for Package {
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fn from(value: &str) -> Self {
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Self::from(value.to_string())
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}
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}
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impl Package {
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/// From a string that contains a package name, optionally prefixed by a
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/// repository, return the package name as well as the repository if it
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/// exists.
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///
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/// # Panics
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///
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/// Panics if `string` is empty.
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fn split_into_name_and_repo(string: &str) -> (String, Option<String>) {
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if let Some((before, after)) = string.split_once('/') {
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(after.to_string(), Some(before.to_string()))
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} else {
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(string.to_string(), None)
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}
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}
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/// Try to parse a string (from a line in a group file) and return a package.
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/// From the string, any possible comment is removed and whitespace is trimmed.
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/// Returns `None` if there is nothing left after trimming.
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pub fn try_from<S>(s: S) -> Option<Self>
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where
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S: AsRef<str>,
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{
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let trimmed = remove_comment_and_trim_whitespace(s.as_ref());
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if trimmed.is_empty() {
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return None;
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}
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let (name, repo) = Self::split_into_name_and_repo(trimmed);
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Some(Self { name, repo })
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}
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}
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impl PartialEq for Package {
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fn eq(&self, other: &Self) -> bool {
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let self_repo = self.repo.as_ref();
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let other_repo = other.repo.as_ref();
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// iff both packages have repos, they must be identical, otherwise we don't care
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let repos_are_identical =
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self_repo.map_or(true, |sr| other_repo.map_or(true, |or| sr == or));
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let names_are_identical = self.name == other.name;
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names_are_identical && repos_are_identical
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}
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}
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impl Hash for Package {
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fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
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self.name.hash(state);
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}
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}
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impl Display for Package {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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match &self.repo {
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None => (),
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Some(repo) => {
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f.write_str(repo)?;
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f.write_char('/')?;
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}
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}
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f.write_str(&self.name)
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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::Package;
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#[test]
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fn split_into_name_and_repo() {
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let x = "repo/name".to_string();
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let (name, repo) = Package::split_into_name_and_repo(&x);
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assert_eq!(name, "name");
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assert_eq!(repo, Some("repo".to_string()));
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let x = "something".to_string();
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let (name, repo) = super::Package::split_into_name_and_repo(&x);
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assert_eq!(name, "something");
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assert_eq!(repo, None);
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}
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#[test]
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fn from() {
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let x = "myrepo/somepackage # ".to_string();
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let p = Package::try_from(x).expect("this should be a valid package line");
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assert_eq!(p.name, "somepackage");
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assert_eq!(p.repo, Some("myrepo".to_string()));
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}
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}
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