Module text_width 

Shared display width helpers for layout and rendering.

This module centralizes glyph width calculation so layout (ftui-text) and rendering (ftui-render) stay in lockstep. It intentionally avoids ad-hoc emoji heuristics and relies on Unicode data tables.

Functions

ascii_width

Fast-path width for pure printable ASCII.

char_width

Width of a single Unicode scalar.

cjk_width_enabled

Cached CJK width policy (fast path).

cjk_width_from_env

Compute CJK width policy using a custom environment lookup.

display_width

Width of a string in terminal cells.

grapheme_width

Width of a single grapheme cluster.