Module words 

Word-wise motion, and the keys that ask for it.

Alt-← and Alt-→ are what a terminal user reaches for to cross a word, but terminals spell them in more than one way: some send a modified arrow, some report the same keypress with the Meta or Super bit instead of Alt, and some send the readline bindings Alt-b and Alt-f. All of them mean the same thing here — along with Ctrl-←/→, which is the other common spelling.

Functions

is_alt

Alt, however the terminal reported it.

is_delete_word_left

Alt-Backspace: delete the word before the cursor.

is_typed

A character key that should be typed, rather than one carrying a modifier we did not bind.

is_word_left

Alt-←, Ctrl-←, or Alt-b: move to the start of the word before the cursor.

is_word_right

Alt-→, Ctrl-→, or Alt-f: move past the end of the word after the cursor.

word_left

The index the cursor lands on moving left by a word: over any spaces, then over the word.

word_right

The index the cursor lands on moving right by a word: over any spaces, then over the word.