delta-gitu 0.1.7

An experimental fork of gitu (a git client inspired by Magit), published as a library for delta to embed
Documentation 
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use crate::items::RenderParams;
use std::{iter, rc::Rc, sync::Arc};

use crate::{
    Res,
    config::Config,
    git,
    item_data::{ItemData, SectionHeader},
    items::{self, Item, RenderedRow, hash},
};
use git2::Repository;

use super::{Screen, streamed_items};
use crate::error::Error;
use crate::stream::{Input, Stream};

pub(crate) fn create(
    config: Arc<Config>,
    repo: Rc<Repository>,
    params: RenderParams,
    reference: String,
    target: Option<(String, u32)>,
) -> Res<Screen> {
    // A target has to be found among the rows, so they are all drawn first.
    let wait_for_all = target.is_some();
    let mut screen = Screen::streamed(
        Arc::clone(&config),
        params,
        Box::new(move |params: RenderParams| {
            let commit = git::show_summary(repo.as_ref(), &reference)?;

            // The header as the user's show command draws it, its first row
            // heading the commit; or gitu's own.
            let (heading, details): (Option<RenderedRow>, Vec<Item>) =
                match items::rendered_show_header(&config, &repo, &params, &commit.hash) {
                    Some(rows) => {
                        let mut rows = rows.into_iter();
                        let heading = rows.next();
                        let details = rows
                            .map(|row| Item {
                                id: hash(["commit", &commit.hash]),
                                depth: 1,
                                unselectable: true,
                                rendered: Some(Rc::new(row)),
                                ..Default::default()
                            })
                            .collect();
                        (heading, details)
                    }
                    None => (
                        None,
                        commit
                            .details
                            .lines()
                            .map(|line| Item {
                                id: hash(["commit", &commit.hash]),
                                depth: 1,
                                unselectable: true,
                                data: ItemData::Raw(line.to_string()),
                                ..Default::default()
                            })
                            .collect(),
                    ),
                };

            let header: Vec<Item> = iter::once(Item {
                id: hash(["commit_section", &commit.hash]),
                depth: 0,
                data: ItemData::Header(SectionHeader::Commit(commit.hash.clone())),
                rendered: heading.map(Rc::new),
                ..Default::default()
            })
            .chain(details)
            .chain([items::blank_line()])
            .collect();

            let renderer = (!config.general.diff_renderer.command.is_empty())
                .then(|| {
                    crate::diff_renderer::renderer_command(
                        &config.general.diff_renderer.command,
                        &params,
                        None,
                    )
                })
                .flatten();
            let show = git::show_command(&repo, &reference, params.context.as_deref());
            let stream =
                Stream::start(Input::Command(show), renderer, u64::MAX).map_err(Error::GitShow)?;

            let config = Arc::clone(&config);
            let reference = reference.clone();
            let params = RenderParams {
                streaming: params.streaming && !wait_for_all,
                ..params
            };
            streamed_items(stream, &params, move |snapshot| {
                let diff = Rc::new(git::shown(&reference, snapshot.text));
                Ok(header
                    .iter()
                    .cloned()
                    .chain(items::drawn_diff_items(
                        &config,
                        &diff,
                        snapshot.rendered.as_deref(),
                        0,
                        false,
                        Some(commit.hash.clone()),
                    ))
                    .collect())
            })
        }),
    )?;

    if let Some((file, line_num)) = target {
        let found = screen.select_matching(|data| {
            if let ItemData::HunkLine {
                diff,
                file_i,
                hunk_i,
                line_i,
                line_range,
                ..
            } = data
            {
                if diff.file_diffs[*file_i].header.new_file.fmt(&diff.text) != file {
                    return false;
                }
                let line = &diff.hunk_content(*file_i, *hunk_i)[line_range.clone()];
                !line.starts_with('-')
                    && diff.hunk_line_new_file_num(*file_i, *hunk_i, *line_i) == line_num
            } else {
                false
            }
        });
        if !found {
            screen.select_matching(|data| {
                matches!(data, ItemData::Delta { diff, file_i, .. }
                    if diff.file_diffs[*file_i].header.new_file.fmt(&diff.text) == file)
            });
        }
    }

    Ok(screen)
}