Implementation of the wcwidth(3) and wcswidth(3) functions for OCaml, which lets you calculate the number of columns a string occupies in a terminal.
Add wcwidth to your project dependencies.
# Wcwidth.wcswidth "hello";;
- : int = 5
# Wcwidth.wcswidth "🦆";;
- : int = 2
The Unicode version the library uses is documented in wcwidth/char_list.ml.
This file also contains lists of zero-width and wide characters, and is derived from the Python wcwidth package.
This file can be updated (e.g. to use a new Unicode version) using the Python script setup_char_lists.py:
python -m venv .venv
source .venv/bin/activate
python -m pip install wcwidth
python setup_char_lists.py