delta-gitu 0.1.7

use super::*;
use std::path::{Path, PathBuf};

fn setup_scroll(mut ctx: TestContext) -> (TestContext, crate::app::App) {
    for file in ["file-1", "file-2", "file-3"] {
        commit(&ctx.dir, file, "");
        fs::write(
            ctx.dir.join(file),
            (1..=20).fold(String::new(), |mut acc, i| {
                use std::fmt::Write as _;

                writeln!(acc, "line {} ({})", i, file).unwrap();
                acc
            }),
        )
        .unwrap();
    }

    let mut app = ctx.init_app();
    ctx.update(&mut app, keys("jjjj<tab>k<tab>k<tab>"));
    (ctx, app)
}

#[test]
fn scroll_down() {
    let (mut ctx, mut app) = setup_scroll(setup_clone!());
    ctx.update(&mut app, keys(HALF_PAGE_DOWN));
    insta::assert_snapshot!(ctx.redact_buffer());
}

/// One key folds the whole view down to its headings, and opens it again.
#[test]
fn folding_everything_and_opening_it_again() {
    let (mut ctx, mut app) = setup_scroll(setup_clone!());

    ctx.update(&mut app, keys("<backtab>"));
    let folded = ctx.redact_buffer();
    ctx.update(&mut app, keys("<backtab>"));
    let opened = ctx.redact_buffer();

    assert!(!folded.contains("file-1"), "still open:\n{folded}");
    assert!(folded.contains("Unstaged changes"), "{folded}");
    assert!(
        opened.contains("line 1 (file-1)"),
        "still folded:\n{opened}"
    );
}

/// A terminal sends shift-tab as backtab with the shift modifier still set.
/// The keycode already says shift was held, so a `backtab` binding — which is
/// what config can name — has to match it.
#[test]
fn shift_tab_reaches_a_backtab_binding() {
    let (mut ctx, mut app) = setup_scroll(setup_clone!());

    ctx.update(&mut app, keys("<shift+backtab>"));

    assert!(
        !ctx.redact_buffer().contains("file-1"),
        "shift-tab did nothing:\n{}",
        ctx.redact_buffer()
    );
}

/// A page is a whole viewport, which is two half pages.
#[test]
fn a_page_is_a_whole_viewport() {
    let (mut halves, mut halves_app) = setup_scroll(TestContext::setup_clone("page_in_halves"));
    halves.update(&mut halves_app, keys("<ctrl+d><ctrl+d>"));

    let (mut page, mut page_app) = setup_scroll(TestContext::setup_clone("page_at_once"));
    page.update(&mut page_app, keys("<pagedown>"));

    assert_eq!(page.redact_buffer(), halves.redact_buffer());
}

/// Space is how every pager since `more` turns the page, and what magit binds
/// it to; backspace is its other half.
#[test]
fn space_turns_the_page() {
    let (mut keys_ctx, mut keys_app) = setup_scroll(TestContext::setup_clone("page_by_key"));
    keys_ctx.update(&mut keys_app, keys("<pagedown><pagedown><pageup>"));

    let (mut space_ctx, mut space_app) = setup_scroll(TestContext::setup_clone("page_by_space"));
    space_ctx.update(&mut space_app, keys("<space><space><backspace>"));

    assert_eq!(space_ctx.redact_buffer(), keys_ctx.redact_buffer());
}

#[test]
fn a_page_down_and_a_page_up_come_back() {
    let (mut ctx, mut app) = setup_scroll(setup_clone!());
    let before = ctx.redact_buffer();

    ctx.update(&mut app, keys("<pagedown>"));
    let paged = ctx.redact_buffer();
    ctx.update(&mut app, keys("<pageup>"));

    assert_ne!(paged, before, "page down did not scroll");
    assert_eq!(ctx.redact_buffer(), before, "page up did not come back");
}

/// Paging through a diff carries the cursor with the view, selecting whatever
/// row it lands on — a line within a hunk, when that is what is there.
#[test]
fn paging_carries_the_cursor_into_the_hunk() {
    let (mut ctx, mut app) = setup_scroll(setup_clone!());
    ctx.update(
        &mut app,
        keys(&format!("{HALF_PAGE_DOWN}{HALF_PAGE_DOWN}{HALF_PAGE_DOWN}")),
    );
    insta::assert_snapshot!(ctx.redact_buffer());
}

#[test]
fn move_prev_sibling() {
    let (mut ctx, mut app) = setup_scroll(setup_clone!());
    ctx.update(&mut app, keys("<alt+k><alt+k>"));
    insta::assert_snapshot!(ctx.redact_buffer());
}

#[test]
fn move_next_sibling() {
    let (mut ctx, mut app) = setup_scroll(setup_clone!());
    ctx.update(&mut app, keys("<alt+j>"));
    insta::assert_snapshot!(ctx.redact_buffer());
}

#[test]
fn move_next_then_parent_section() {
    let (mut ctx, mut app) = setup_scroll(setup_clone!());
    ctx.update(&mut app, keys("<alt+j><alt+h>"));
    insta::assert_snapshot!(ctx.redact_buffer());
}

#[test]
fn exit_from_picker_exits_menu() {
    snapshot!(setup_clone!(), "bb<esc>");
}

#[test]
fn re_enter_picker_from_menu() {
    snapshot!(setup_clone!(), "bb<esc>bb");
}

#[test]
fn renderer_features_offers_the_configured_ones() {
    snapshot!(setup_clone!(), "-");
}

fn with_feature_key(ctx: &mut TestContext, feature: &str, key: char) {
    ctx.config()
        .general
        .diff_renderer
        .feature_keys
        .insert(feature.into(), key);
}

/// A config file of the test's own, holding `text`, for setting a key to write
/// to.
fn config_file(ctx: &mut TestContext, text: &str) -> (temp_dir::TempDir, PathBuf) {
    let dir = temp_dir::TempDir::new().unwrap();
    let path = dir.path().join("config.toml");
    if !text.is_empty() {
        fs::write(&path, text).unwrap();
    }
    ctx.config().path = path.clone();
    (dir, path)
}

fn saved_feature_keys(path: &Path) -> Vec<(String, char)> {
    crate::config::init_config(Some(path.to_owned()))
        .unwrap()
        .general
        .diff_renderer
        .feature_keys
        .into_iter()
        .collect()
}

/// A feature's key is a top-level key: it toggles the feature without `-`.
#[test]
fn a_feature_key_toggles_its_feature() {
    let mut ctx = setup_clone!();
    with_feature_key(&mut ctx, "side-by-side", 'x');
    let mut app = ctx.init_app();

    ctx.update(&mut app, keys("x"));
    assert_eq!(&*app.state.features, ["side-by-side".to_string()]);

    ctx.update(&mut app, keys("x"));
    assert!(app.state.features.is_empty());
}

/// The help menu lists feature keys with the other top-level keys.
#[test]
fn the_help_menu_lists_feature_keys() {
    let mut ctx = setup_clone!();
    with_feature_key(&mut ctx, "side-by-side", 'x');
    let mut app = ctx.init_app();

    ctx.update(&mut app, keys("?"));
    let buffer = ctx.redact_buffer();
    assert!(
        regex::Regex::new(r"\bx +side-by-side")
            .unwrap()
            .is_match(&buffer),
        "{buffer}"
    );
}

#[test]
fn the_help_menu_sets_feature_keys_apart_from_submenus() {
    let mut ctx = setup_clone!();
    with_feature_key(&mut ctx, "side-by-side", 'x');
    snapshot!(ctx, "?");
}

/// A key that does something already keeps doing it.
#[test]
fn a_configured_feature_key_that_is_already_bound_is_a_config_error() {
    let dir = temp_dir::TempDir::new().unwrap();
    let path = dir.path().join("config.toml");
    fs::write(
        &path,
        "[general]\ndiff_renderer.feature_keys = { side-by-side = \"s\" }\n",
    )
    .unwrap();

    assert!(crate::config::init_config(Some(path)).is_err());
}

/// The list is moved through, not searched: letters are keys.
#[test]
fn the_feature_list_is_moved_through_with_the_arrows() {
    let mut ctx = setup_clone!();
    let mut app = ctx.init_app();

    ctx.update(&mut app, keys("<-><down><enter>"));
    assert_eq!(&*app.state.features, ["line-numbers".to_string()]);
}

/// Each feature's key is written beside it.
#[test]
fn the_feature_list_shows_feature_keys() {
    let mut ctx = setup_clone!();
    with_feature_key(&mut ctx, "line-numbers", 'x');
    snapshot!(ctx, "-");
}

/// In the list, a letter becomes the selected feature's key. It works at once,
/// and is saved to the user's config file beside what was already there.
#[test]
fn a_letter_in_the_feature_list_sets_the_selected_features_key() {
    let mut ctx = setup_clone!();
    let (_dir, path) = config_file(&mut ctx, "# mine\n[general]\nvisit_context_lines = true\n");
    let mut app = ctx.init_app();

    ctx.update(&mut app, keys("-x<esc>"));
    assert!(
        app.state.features.is_empty(),
        "setting a key toggles nothing"
    );

    ctx.update(&mut app, keys("x"));
    assert_eq!(&*app.state.features, ["side-by-side".to_string()]);

    assert!(fs::read_to_string(&path).unwrap().starts_with("# mine\n"));
    assert_eq!(saved_feature_keys(&path), [("side-by-side".into(), 'x')]);
}

#[test]
fn the_same_letter_again_unsets_the_key() {
    let mut ctx = setup_clone!();
    let (_dir, path) = config_file(&mut ctx, "");
    let mut app = ctx.init_app();

    ctx.update(&mut app, keys("-xx<esc>x"));
    assert!(app.state.features.is_empty());
    assert_eq!(saved_feature_keys(&path), []);
}

#[test]
fn another_letter_replaces_the_key() {
    let mut ctx = setup_clone!();
    let (_dir, path) = config_file(&mut ctx, "");
    let mut app = ctx.init_app();

    ctx.update(&mut app, keys("-xw<esc>x"));
    assert!(app.state.features.is_empty());

    ctx.update(&mut app, keys("w"));
    assert_eq!(&*app.state.features, ["side-by-side".to_string()]);
    assert_eq!(saved_feature_keys(&path), [("side-by-side".into(), 'w')]);
}

#[test]
fn a_key_set_for_one_feature_is_taken_from_another() {
    let mut ctx = setup_clone!();
    let (_dir, path) = config_file(&mut ctx, "");
    let mut app = ctx.init_app();

    ctx.update(&mut app, keys("-x<down>x<esc>x"));
    assert_eq!(&*app.state.features, ["line-numbers".to_string()]);
    assert_eq!(saved_feature_keys(&path), [("line-numbers".into(), 'x')]);
}

/// A letter that already does something at the top level stays as it is.
#[test]
fn a_letter_bound_at_the_top_level_is_refused() {
    let mut ctx = setup_clone!();
    let (_dir, path) = config_file(&mut ctx, "");
    let mut app = ctx.init_app();

    ctx.update(&mut app, keys("-s<esc>"));
    assert!(app.state.feature_keys.is_empty());
    assert!(!path.exists());
}

/// The features the user defined for themselves are theirs to choose from too,
/// by a pattern rather than one by one.
#[test]
fn renderer_features_offers_those_in_git_config_a_pattern_matches() {
    let mut ctx = setup_clone!();
    ctx.config().general.diff_renderer.features = vec!["*".into()];
    run(
        &ctx.dir,
        &["git", "config", "delta.my-theme.syntax-theme", "Nord"],
    );
    let mut app = ctx.init_app();

    ctx.update(&mut app, keys("<-><enter>"));
    assert_eq!(&*app.state.features, ["my-theme".to_string()]);
}

#[test]
fn choosing_a_renderer_feature_marks_it() {
    // Picking `side-by-side` turns it on; re-opening shows it marked, and
    // picking it again turns it back off.
    let ctx = setup_clone!();
    let mut ctx = ctx;
    let mut app = ctx.init_app();

    ctx.update(&mut app, keys("<-><enter>"));
    assert_eq!(&*app.state.features, ["side-by-side".to_string()]);

    ctx.update(&mut app, keys("<-><enter>"));
    assert!(
        app.state.features.is_empty(),
        "picking it again turns it off"
    );
}