termutil

func ContentWidth ¶

func ContentWidth(w io.Writer) int

ContentWidth returns the usable content width for rows written to w.

Detection order:

1. Terminal size from w if it is an *os.File connected to a TTY.
2. $COLUMNS env var — set by most shells, survives pipes and subshells.
3. layout.DefaultContentWidth — safe fallback for CI pipes and file output.

Width is derived from w itself first so it behaves correctly when output is redirected or captured, while $COLUMNS provides the actual terminal hint when the writer is a pipe (e.g. `stagefreight ci run docs | tee log.txt`).