Function charClass

src/ink/selection.ts:151–155

* Character class for double-click word-expansion. Cells with the same * class as the clicked cell are included in the selection; a class change * is a boundary. Matches typical terminal-emulator behavior (iTerm2 etc.): * double-click on `foo` selects `foo`, on `->` selects `->`, on spaces * sel

(c: string)

 * selects the whitespace run.
 */
function charClass(c: string): 0 | 1 | 2 {
  if (c === ' ' || c === '') return 0
  if (WORD_CHAR.test(c)) return 1
  return 2
}

/**
 * Find the bounds of the same-class character run at (col, row). Returns