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# Test that we have metadata about what options this system's grep(1) supports,
# and try to create it if not
(
# Create a directory to hold metadata about grep
gcd=$HOME/.cache/grep
if ! [ -d "$gcd" ] ; then
mkdir -p -- "$gcd" || exit
fi
# Write grep(1)'s --help output to a file, even if it's empty
if ! [ -f "$gcd"/help ] ; then
grep --help </dev/null >"$gcd"/help 2>/dev/null || exit
# Iterate through some useful options and create files to show they're
# available
for opt in binary-files color exclude exclude-dir ; do
grep -q -- --"$opt" "$gcd"/help || continue
touch -- "$gcd"/"$opt" || exit
done
fi
) || return
# If one of the available options is --color, set the GREP_COLORS environment
# variable
if [ -e "$HOME"/.cache/grep/color ] ; then
GREP_COLORS='ms=01;31:mc=01;31:sl=:cx=:fn=35:ln=32:bn=32:se=36'
export GREP_COLORS
fi
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