git-next/crates/cli/src/tui/components/history.rs

//
use git_next_core::git::graph::Log;
use ratatui::{
    style::{Color, Style},
    text::{Line, Span, Text},
    widgets::{Paragraph, Widget},
};
use regex::Regex;

use super::HeightContraintLength;

pub struct CommitLog<'a> {
    pub log: &'a Log,
}
impl<'a> HeightContraintLength for CommitLog<'a> {
    fn height_constraint_length(&self) -> u16 {
        u16::try_from(self.log.len()).unwrap_or(u16::MAX)
    }
}
impl<'a> Widget for CommitLog<'a> {
    fn render(self, area: ratatui::prelude::Rect, buf: &mut ratatui::prelude::Buffer)
    where
        Self: Sized,
    {
        Paragraph::new(Text::from(
            self.log
                .iter()
                .map(LogLine::new)
                .map(Line::from)
                .collect::<Vec<_>>(),
        ))
        .render(area, buf);
    }
}

struct LogLine {
    raw: String,
}
impl LogLine {
    fn new(raw: impl Into<String>) -> Self {
        Self { raw: raw.into() }
    }
}
lazy_static::lazy_static! {
    static ref RE: Regex =
    #[allow(clippy::unwrap_used)]
        Regex::new(
            r"^(?<pre>.*)\s(?<hash>[0-9a-f]{7})\s\((?<branches>.*?)\)\s(?<message>.*)",
        ).unwrap();

    static ref BRANCHES: Regex =
    #[allow(clippy::unwrap_used)]
        Regex::new(
            r"origin\/(?<branch>[^,]+)",
        ).unwrap();
}
impl From<LogLine> for Line<'_> {
    fn from(value: LogLine) -> Self {
        if let Some(caps) = RE.captures(&value.raw) {
            let pre = caps["pre"].to_owned();
            let hash = caps["hash"].to_owned();
            let message = caps["message"].to_owned();
            let mut branches = BRANCHES
                .captures_iter(&caps["branches"])
                .map(|captures| captures["branch"].to_owned())
                .filter(|branch| branch != "HEAD")
                .collect::<Vec<_>>();
            if branches.is_empty() {
                // line without branches
                Line::from(vec![
                    pre.into(),
                    " ".into(),
                    hash.into(),
                    " ".into(),
                    message.into(),
                ])
            } else {
                // line withbranches
                let mut spans = vec![pre.into(), " ".into(), hash.into(), " ".into()];
                branches.sort();
                branches
                    .into_iter()
                    .map(|branch| format!("({branch})"))
                    .map(Span::from)
                    .map(|span| span.style(Style::default().fg(Color::White).bg(Color::Blue)))
                    .for_each(|span| spans.push(span));
                spans.push(" ".into());
                spans.push(message.into());
                Line::from(spans)
            }
        } else {
            // non-commit line
            Line::from(value.raw.clone())
        }
    }
}

#[cfg(test)]
mod tests {
    use tracing::info;

    use super::RE;

    #[test_log::test]
    fn parse_log_line() -> Result<(), Box<dyn std::error::Error>> {
        let line = "* 97b6853 (origin/next, origin/main, origin/dev, origin/HEAD) refactor(tui): simplify repo identity widget";
        RE.captures(line).map_or_else(
            || Err("Failed to capture".into()),
            |caps| {
                info!(?caps, "");
                assert_eq!(&caps["pre"], "*");
                assert_eq!(&caps["hash"], "97b6853");
                assert_eq!(
                    &caps["branches"],
                    "origin/next, origin/main, origin/dev, origin/HEAD"
                );
                assert_eq!(
                    &caps["message"],
                    "refactor(tui): simplify repo identity widget"
                );
                Ok(())
            },
        )
    }
}