strop-engine 0.27.0

//! Change-plan engine: application, refusals, grouped undo — driven
//! through injected LspEvents like the live wire delivers them.

use super::*;
use crate::editor::events::AppEvent;
use crate::editor::Editor;
use std::path::PathBuf;
use strop_core::id::LineIndex;
use strop_core::Buffer;
use strop_lsp::{
    LspEvent, PositionEncoding, ReplyContext, RequestId, RequestKind, RequestStamp, ServerColumn,
    ServerEdit, ServerId, ServerPosition,
};
use strop_workspace::ResourceLocation;

fn at(line: usize, col: usize) -> ServerPosition {
    ServerPosition {
        line: LineIndex::new(line),
        column: ServerColumn::new(col),
    }
}

fn edit(sl: usize, sc: usize, el: usize, ec: usize, text: &str) -> ServerEdit {
    ServerEdit {
        start: at(sl, sc),
        end: at(el, ec),
        new_text: text.into(),
    }
}

fn arm(e: &mut Editor, document: DocumentId, id: u64, kind: RequestKind) -> ReplyContext {
    let server = ServerId::new(7);
    let (revision, path) = {
        let doc = e.docs.get(document).unwrap();
        (doc.buf.revision(), doc.buf.path.clone().unwrap())
    };
    e.lsp_state.bindings.insert(
        document,
        crate::editor::lsp::state::Binding {
            server,
            revision,
            path,
            root: PathBuf::from("/workspace"),
            language: "rust".into(),
            target: strop_workspace::Filesystem::Local,
        },
    );
    let stamp = RequestStamp {
        request: RequestId::new(id),
        server,
        document,
        revision,
    };
    e.lsp_state.navigation = Some(stamp);
    ReplyContext {
        stamp,
        encoding: PositionEncoding::Utf8,
        kind,
    }
}

fn file_editor(dir: &tempfile::TempDir, name: &str, text: &str) -> (Editor, DocumentId) {
    std::fs::write(dir.path().join(name), text).unwrap();
    let mut e = Editor::new_in(Buffer::from_text("scratch\n"), dir.path().to_path_buf());
    e.open_fixture(&dir.path().join(name)).unwrap();
    let document = e.current();
    (e, document)
}

#[test]
fn auto_format_chains_the_save_after_formatting() {
    // config auto_format: the format reply runs the waiting save —
    // formatting happens, then the write (helix's auto-format).
    let dir = tempfile::tempdir().unwrap();
    let (mut e, document) = file_editor(&dir, "chain.txt", "hello   world\n");
    e.lsp_state.after_format = Some(crate::editor::lsp::state::AfterFormat::Save {
        document,
        close: false,
    });
    let context = arm(&mut e, document, 1, RequestKind::Format);
    e.handle_app_event(AppEvent::Lsp(LspEvent::Edits {
        context,
        edits: vec![edit(0, 0, 0, 13, "hello world")],
    }));
    e.wait_io().unwrap();
    assert_eq!(
        std::fs::read_to_string(dir.path().join("chain.txt")).unwrap(),
        "hello world\n",
        "the chained save wrote the formatted text"
    );
}

#[test]
fn auto_format_chains_the_save_when_already_formatted() {
    let dir = tempfile::tempdir().unwrap();
    let (mut e, document) = file_editor(&dir, "chain2.txt", "hello world\n");
    e.lsp_state.after_format = Some(crate::editor::lsp::state::AfterFormat::Save {
        document,
        close: false,
    });
    let context = arm(&mut e, document, 1, RequestKind::Format);
    e.handle_app_event(AppEvent::Lsp(LspEvent::Edits {
        context,
        edits: Vec::new(),
    }));
    e.wait_io().unwrap();
    assert_eq!(
        std::fs::read_to_string(dir.path().join("chain2.txt")).unwrap(),
        "hello world\n",
        "an empty format reply still saves"
    );
}

#[test]
fn auto_format_chains_the_save_on_formatter_refusal() {
    // A refused/failed format never holds the save hostage.
    let dir = tempfile::tempdir().unwrap();
    let (mut e, document) = file_editor(&dir, "chain3.txt", "hello world\n");
    e.lsp_state.after_format = Some(crate::editor::lsp::state::AfterFormat::Save {
        document,
        close: false,
    });
    let context = arm(&mut e, document, 1, RequestKind::Format);
    e.handle_app_event(AppEvent::Lsp(LspEvent::Note {
        context,
        text: "format is not supported by this language server".into(),
    }));
    e.wait_io().unwrap();
    assert_eq!(
        std::fs::read_to_string(dir.path().join("chain3.txt")).unwrap(),
        "hello world\n"
    );
}

#[test]
fn plain_save_without_a_binding_writes_directly() {
    let dir = tempfile::tempdir().unwrap();
    let (mut e, _document) = file_editor(&dir, "plain.txt", "x\n");
    e.feed_text("A y");
    e.feed(crate::editor::Key::Esc);
    e.request_save(None, false, false);
    e.wait_io().unwrap();
    assert_eq!(
        std::fs::read_to_string(dir.path().join("plain.txt")).unwrap(),
        "x y\n",
        "no binding: the save never waits for a formatter"
    );
}

#[test]
fn format_applies_edits_and_records_a_receipt() {
    let dir = tempfile::tempdir().unwrap();
    let (mut e, document) = file_editor(&dir, "a.txt", "hello   world\n");
    let context = arm(&mut e, document, 1, RequestKind::Format);
    e.handle_app_event(AppEvent::Lsp(LspEvent::Edits {
        context,
        edits: vec![edit(0, 0, 0, 5, "hi")],
    }));
    assert_eq!(e.buf().text().to_string(), "hi   world\n");
    assert_eq!(e.message, "format: applied to 1 buffer(s)");
}

#[test]
fn rename_applies_across_open_documents() {
    let dir = tempfile::tempdir().unwrap();
    let (mut e, first) = file_editor(&dir, "a.txt", "alpha here\n");
    let b_path = dir.path().join("b.txt");
    std::fs::write(&b_path, "alpha there\n").unwrap();
    e.open_fixture(&b_path).unwrap();
    let second = e.current();
    let _ = arm(&mut e, first, 1, RequestKind::Rename);
    let context = arm(&mut e, second, 2, RequestKind::Rename);
    let path_a = dir.path().join("a.txt");
    e.handle_app_event(AppEvent::Lsp(LspEvent::WorkspaceEdits {
        context,
        edits: vec![
            (
                ResourceLocation::local(path_a.clone()),
                vec![edit(0, 0, 0, 5, "omega")],
            ),
            (
                ResourceLocation::local(b_path.clone()),
                vec![edit(0, 0, 0, 5, "omega")],
            ),
        ],
    }));
    // Multi-target rename opens the review buffer (0049 §8); nothing
    // mutates before Apply.
    let review = e.current();
    assert_ne!(review, second, "the review buffer is focused");
    assert_eq!(
        e.docs.get(second).unwrap().buf.text().to_string(),
        "alpha there\n",
        "unapplied"
    );
    e.review_apply_pub();
    assert_eq!(
        e.docs.get(second).unwrap().buf.text().to_string(),
        "omega there\n"
    );
    // Grouped undo restores both buffers through their receipts.
    e.feed_text(":undo-change\r");
    assert_eq!(
        e.docs.get(second).unwrap().buf.text().to_string(),
        "alpha there\n"
    );
    assert_eq!(
        e.docs.get(first).unwrap().buf.text().to_string(),
        "alpha here\n"
    );
}

#[test]
fn unbound_targets_are_named_refusals_never_silent() {
    let dir = tempfile::tempdir().unwrap();
    let (mut e, document) = file_editor(&dir, "a.txt", "alpha here\n");
    let context = arm(&mut e, document, 1, RequestKind::Rename);
    e.handle_app_event(AppEvent::Lsp(LspEvent::WorkspaceEdits {
        context,
        edits: vec![
            (
                ResourceLocation::local(dir.path().join("a.txt")),
                vec![edit(0, 0, 0, 5, "omega")],
            ),
            (
                ResourceLocation::local(dir.path().join("ghost.txt")),
                vec![edit(0, 0, 0, 3, "x")],
            ),
        ],
    }));
    // a plan carrying refusals opens the review (0049 §8)
    assert_eq!(
        e.docs.get(document).unwrap().buf.text().to_string(),
        "alpha here\n",
        "unapplied"
    );
    e.review_apply_pub();
    assert_eq!(
        e.docs.get(document).unwrap().buf.text().to_string(),
        "omega here\n"
    );
    assert!(e.message.contains("refused"), "{}", e.message);
}

#[test]
fn a_document_edited_since_the_plan_is_refused_by_name() {
    let dir = tempfile::tempdir().unwrap();
    let (mut e, document) = file_editor(&dir, "a.txt", "alpha here\n");
    let _ = arm(&mut e, document, 1, RequestKind::Rename); // bind the document
    let location = ResourceLocation::local(dir.path().join("a.txt"));
    let plan = e.build_change_plan(
        ChangeProducer::Rename,
        vec![(location, vec![edit(0, 0, 0, 5, "omega")])],
        PositionEncoding::Utf8,
    );
    e.feed_text("0rx"); // revision moves past the plan's base
    e.apply_change_plan(plan);
    assert_eq!(e.buf().text().to_string(), "xlpha here\n");
    assert!(e.message.contains("refused"), "{}", e.message);
    assert!(e.message.contains("0 buffer(s) applied"), "{}", e.message);
}

#[test]
fn stale_edit_replies_never_touch_the_buffer() {
    let dir = tempfile::tempdir().unwrap();
    let (mut e, document) = file_editor(&dir, "a.txt", "alpha here\n");
    let mut context = arm(&mut e, document, 1, RequestKind::Format);
    context.stamp.revision = BufferRevision::new(99); // not the live revision
    e.handle_app_event(AppEvent::Lsp(LspEvent::Edits {
        context,
        edits: vec![edit(0, 0, 0, 5, "SNEAKY")],
    }));
    assert_eq!(e.buf().text().to_string(), "alpha here\n");
    assert_ne!(e.message, "format: applied to 1 buffer(s)");
}

#[test]
fn grouped_undo_skips_buffers_edited_since_the_receipt() {
    let dir = tempfile::tempdir().unwrap();
    let (mut e, first) = file_editor(&dir, "a.txt", "alpha here\n");
    let b_path = dir.path().join("b.txt");
    std::fs::write(&b_path, "alpha there\n").unwrap();
    e.open_fixture(&b_path).unwrap();
    let second = e.current();
    let _ = arm(&mut e, first, 1, RequestKind::Rename);
    let context = arm(&mut e, second, 2, RequestKind::Rename);
    e.handle_app_event(AppEvent::Lsp(LspEvent::WorkspaceEdits {
        context,
        edits: vec![
            (
                ResourceLocation::local(dir.path().join("a.txt")),
                vec![edit(0, 0, 0, 5, "omega")],
            ),
            (
                ResourceLocation::local(b_path),
                vec![edit(0, 0, 0, 5, "omega")],
            ),
        ],
    }));
    e.review_apply_pub();
    e.switch_to(second);
    e.feed_text("0rZ"); // edit b.txt after the rename
    e.feed_text(":undo-change\r");
    assert!(e.message.contains("skipped"), "{}", e.message);
    assert_eq!(
        e.docs.get(second).unwrap().buf.text().to_string(),
        "Zmega there\n"
    );
    assert_eq!(
        e.docs.get(first).unwrap().buf.text().to_string(),
        "alpha here\n"
    );
}