editor

The editor module is a custom, raw-mode multiline text editor built from scratch.

Standard input methods (like erlang:get_line) block the thread and do not allow for custom keybindings, autocomplete menus, or multiline cursor traversal. This module solves that by capturing individual keystrokes and manually calculating 2D terminal cursor positions using ANSI escape sequences.

Types

Editor

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Tracks the complete state of a single REPL prompt session.

pub type Editor {
  Editor(
    buffer: String,
    cursor: Int,
    history: List(String),
    history_index: Int,
    saved_buffer: option.Option(String),
    menu: option.Option(String),
  )
}

Constructors

```
Editor(
  buffer: String,
  cursor: Int,
  history: List(String),
  history_index: Int,
  saved_buffer: option.Option(String),
  menu: option.Option(String),
)
```
Arguments

buffer

The current raw text being typed by the user

cursor

The 1D index of where the cursor is inside the buffer

history

Previously executed REPL commands

history_index

Current position when navigating history with ArrowUp/ArrowDown

saved_buffer

Temporarily saves the current typing buffer if the user arrows up into history

menu

A pre-rendered string grid of autocomplete suggestions, floating below the prompt

Values

read_line

</>

pub fn read_line(
  prompt: String,
  history: List(String),
  completions: List(String),
) -> String