git-release 0.1.1

Set the release information based on all commits of a tag
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#[cfg(test)]
#[path = "./release_test.rs"]
mod release_test;

use std::collections::HashMap;
use std::fmt::Display;

use super::commit::{Commit, Verb};

/// A Release represents one of more Commits, grouped by the verbs in their title.
pub struct Release<'a> {
    commits: Vec<Commit<'a>>,
}

impl<'a> Release<'a> {
    #[allow(dead_code)]
    pub fn new(commits: Vec<Commit<'a>>) -> Self {
        Release { commits }
    }

    pub fn get_verb_groups(&self) -> HashMap<Verb, Vec<&Commit<'a>>> {
        let mut map: HashMap<Verb, Vec<&Commit>> = HashMap::with_capacity(self.commits.len());
        for commit in &self.commits {
            let verb = commit.verb();
            map.entry(verb).or_default().push(commit);
        }
        map
    }
}

impl<'a> From<Vec<git2::Commit<'a>>> for Release<'a> {
    fn from(commits: Vec<git2::Commit<'a>>) -> Self {
        let commits = commits.into_iter().map(Commit::from).collect();
        Release { commits }
    }
}

impl<'a> Display for Release<'a> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        let mut groups = vec![];
        for (verb, commits) in self.get_verb_groups() {
            let mut contents = String::new();
            contents.push_str(&format!("### {verb:?}\n\n"));
            contents.push_str(
                &commits
                    .into_iter()
                    .map(|commit| format!("- {commit}"))
                    .collect::<Vec<String>>()
                    .join("\n"),
            );
            groups.push(contents);
        }
        write!(f, "{}", groups.join("\n\n"))?;
        Ok(())
    }
}