The NO_COLOR convention (https://no-color.org) only calls for
suppressing ANSI *color* codes. It does not demand the removal of
other attributes such as bold, italic, underline or reverse.
Previously, Paint::is_enabled() bundled anstyle_query::no_color()
into the single boolean that decides whether to emit any formatting.
Because Paint relies on that boolean alone, NO_COLOR ended up
stripping bold, italic, reverse, etc. alongside the color codes.
That conflates two concerns: terminal styling support and color
suppression. It is also contrary to the intent of the standard.
Instead, treat the general style decision separately from the
color decision. Remove the no_color() check from is_enabled()
and add Paint::is_styling_enabled() for the coarse terminal gate.
Style::fmt_prefix and fmt_suffix now query NO_COLOR directly and
conditionally drop foreground and background codes while preserving
non-colour properties. This way bold, italic, underline and the
like continue to work when NO_COLOR is set, while colors alone are
suppressed.
Closes: rad:z3gqcJUoA1n9HaHKufZs5FCSGazv5/cob/xyz.radicle.issue/f922d90
Assisted-by: Pi:deepinfra/moonshotai/Kimi-K2.6
Signed-off-by: Richard Levitte <richard@levitte.org>
ee17109501