vtcode-core 0.123.7

Core library for VT Code - a Rust-based terminal coding agent
Documentation 
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use portable_pty::PtySize;
use vt100::Parser;
use vtcode_config::constants::defaults::DEFAULT_PTY_SCROLLBACK_LINES;

// ---------------------------------------------------------------------------
// PtyScreenState -- wraps vt100 terminal parser
// ---------------------------------------------------------------------------

pub(super) struct PtyScreenState {
    parser: Parser,
}

impl PtyScreenState {
    pub(super) fn new(size: PtySize, scrollback_lines: usize) -> Self {
        let scrollback = if scrollback_lines == 0 {
            DEFAULT_PTY_SCROLLBACK_LINES
        } else {
            scrollback_lines
        };
        let parser = Parser::new(size.rows, size.cols, scrollback);
        Self { parser }
    }

    pub(super) fn process(&mut self, chunk: &[u8]) {
        self.parser.process(chunk);
    }

    pub(super) fn resize(&mut self, size: PtySize) {
        self.parser.screen_mut().set_size(size.rows, size.cols);
    }

    pub(super) fn prepare_snapshot(&self) -> ScreenSnapshot {
        ScreenSnapshot {
            screen_contents: self.parser.screen().contents(),
        }
    }
}

// ---------------------------------------------------------------------------
// ScreenSnapshot (returned by prepare_snapshot)
// ---------------------------------------------------------------------------

pub(super) struct ScreenSnapshot {
    pub(super) screen_contents: String,
}

#[cfg(test)]
mod tests {
    use portable_pty::PtySize;

    use super::PtyScreenState;

    fn test_size() -> PtySize {
        PtySize {
            rows: 4,
            cols: 10,
            pixel_width: 0,
            pixel_height: 0,
        }
    }

    #[test]
    fn backend_processes_plain_text() {
        let size = test_size();
        let mut state = PtyScreenState::new(size, 100);
        state.process(b"hello");
        let snapshot = state.prepare_snapshot();
        assert!(
            snapshot.screen_contents.contains("hello"),
            "screen_contents = {:?}",
            snapshot.screen_contents
        );
    }

    #[test]
    fn backend_handles_newlines() {
        let size = test_size();
        let mut state = PtyScreenState::new(size, 100);
        state.process(b"line1\nline2");
        let snapshot = state.prepare_snapshot();
        assert!(
            snapshot.screen_contents.contains("line1"),
            "screen_contents = {:?}",
            snapshot.screen_contents
        );
        assert!(
            snapshot.screen_contents.contains("line2"),
            "screen_contents = {:?}",
            snapshot.screen_contents
        );
    }

    #[test]
    fn backend_handles_ansi_colors() {
        let size = test_size();
        let mut state = PtyScreenState::new(size, 100);
        state.process(b"\x1B[1;31mcolored\x1B[0m");
        let snapshot = state.prepare_snapshot();
        assert!(
            snapshot.screen_contents.contains("colored"),
            "screen_contents = {:?}",
            snapshot.screen_contents
        );
    }
}