Change rules size only on SIGWINCH. $COLUMNS isn't updated on SIGWINCH yet so "tput" is used. For better performance ruler is calculated by substring. Moving ruler handler to trap cleans console from garbage when "set -x" is set in interactive session. It is useful during debugging of bash completion.

QUILT_DIFF_ARGS="--color=auto -p ab"
QUILT_DIFF_OPTS="-p"
QUILT_REFRESH_ARGS="-p ab"
QUILT_PUSH_ARGS="--color=auto"
QUILT_SERIES_ARGS="--color=auto"
QUILT_PATCH_OPTS="--unified"

QUILT_NO_DIFF_INDEX=1
QUILT_NO_DIFF_TIMESTAMPS=1