85 lines
3.4 KiB
Markdown
85 lines
3.4 KiB
Markdown
# Module Breakdown and Responsibilities
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## 1. src/pty.rs (The Shell Interface)
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Responsibilities:
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- Use portable-pty to create a new PTY.
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- Spawn a default shell process (e.g., bash) connected to the PTY.
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- Provide a way to write user input (from winit) to the PTY.
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- Provide a way to read shell output from the PTY.
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Key Implementation Detail: Reading from the PTY is a blocking operation. You
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should do this on a separate thread. This thread will read data and send it back
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to the main UI thread using a channel (like crossbeam-channel). This prevents
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the UI from freezing while waiting for the shell to output something.
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## 2. src/terminal.rs (The Brains / State Model)
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Responsibilities:
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- Hold the state of the terminal grid: a 2D array of cells, where each cell
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contains a character, foreground color, background color, and style flags
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(bold, italic, etc.).
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- Contain a vte::Parser.
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- Implement the vte::Perform trait. This is the core of this module. The vte
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parser will call methods on your implementation as it processes the byte
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stream from the PTY. For example:
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- print(char): You update the character at the current cursor position in your
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grid and advance the cursor.
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- execute(byte): You handle control characters like newline (\n) or backspace
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(\b).
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- csi_dispatch(...): You handle complex ANSI escape sequences for changing
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colors, moving the cursor, clearing the screen, etc.
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- Keep track of the cursor's position and the current color/style settings.
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## 3. src/renderer.rs (The Painter)
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Responsibilities:
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- Initialize wgpu: get an adapter and device, configure a surface on the winit
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window.
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- Initialize glyphon: create a FontSystem, Cache, Atlas, and TextRenderer.
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- Contain the main render() function. This function will be called on every
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frame.
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- Inside render():
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- Get the current terminal state.
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- Iterate through the terminal grid.
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- For each line of text, create a glyphon::Buffer. Set its text content,
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colors, and styles based on the data in your grid.
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- Use the glyphon::TextRenderer to prepare and draw all the buffers to the
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wgpu surface.
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- Draw the cursor as a solid block or underline.
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## 4. src/main.rs (The Conductor)
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Responsibilities:
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- The main function.
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- Initialize logging (env_logger).
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- Create the winit event loop and window.
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- Initialize your Pty, Terminal, and Renderer modules.
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- Start the PTY reader thread.
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- Run the main event loop.
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### The Main Event Loop (winit::event_loop::run)
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This is where everything comes together. You'll have a match statement to handle
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different events:
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- Event::WindowEvent::Resized: Tell the renderer about the new size. You'll also
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need to inform the PTY of the new dimensions so that applications running in
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the shell (like vim) can reflow correctly.
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- Event::WindowEvent::KeyboardInput: Translate the keyboard event into
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characters or escape sequences and write them to the pty module.
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- Event::UserEvent: This is how your PTY thread will communicate with the main
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thread. When the PTY thread reads new data, it sends it through the channel,
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and you receive it here. You then feed this data into the terminal.vte_parser.
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- Event::WindowEvent::RedrawRequested: This is the signal to render a new frame.
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You call your renderer.render() function here. After processing PTY data, you
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should always request a redraw.
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- Event::WindowEvent::CloseRequested: Terminate the application.
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