display

The display module renders the REPL prompt and active input buffer to the terminal output stream.

It provides real-time, syntax-highlighted visual feedback during typing using the contour library, while applying defensive rendering heuristics to prevent ANSI escaping artifacts during incomplete string inputs.

Values

render

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pub fn render(prompt: String, buffer: String) -> Nil

Clears the current line buffer and redraws the prompt along with the user’s input.

Rendering Heuristics:

Line Reset: Invokes terminal.clear_line() to erase the previous cursor line.
Quote Balancing: Counts quotation marks (") across input graphemes. If the count is odd (indicating an unclosed string literal), syntax highlighting is temporarily bypassed to prevent broken ANSI color code rendering.
ANSI Highlighting: When quote counts are balanced, passes the buffer string to contour.to_ansi() for real-time Gleam syntax coloring before output.