Module sgr 

Select Graphic Rendition (SGR) ANSI encoding, shared by every text-terminal encoder in this workspace.

Headless::format_styled (styled snapshots) and retroglyph-recorder’s write_cast (asciicast export) both need “the SGR codes for this Style,” and neither should carry its own copy.

Codes follow ECMA-48 5th ed. section 8.3.117: 30-37/40-47 for the standard foreground/ background colors, 90-97/100-107 for the bright variants, 38;5;n/48;5;n for 256-color indices, and 38;2;r;g;b/48;2;r;g;b for 24-bit truecolor. (https://www.ecma-international.org/publications-and-standards/standards/ecma-48/)

Functions

push_sgr

Appends the SGR codes for style’s non-default foreground/background to out, as a single \x1b[...m sequence.

sgr_color

The SGR parameter string for color in the foreground (bg: false) or background (bg: true) slot, or None for Color::Default (nothing to emit).