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# Cache the options available to certain programs. Run all this in a subshell
# (none of its state needs to endure in the session)
(
options() {
# Check or create the directory to cache the options
# Shift the program name off; remaining arguments are the options to check
dir=$HOME/.cache/sh/opt/$1
prog=$1
shift
# Directory already exists; bail out
[ -d "$dir" ] && return
# Create the directory and step into it
command -p mkdir -p -- "$dir" || return
cd -- "$dir" || return
# Write the program's --help output to a file, even if it's empty
# This probably only works with GNU tools in general
"$prog" --help </dev/null >help 2>/dev/null || return
# Iterate through remaining arguments (desired options), creating files to
# show they're available if found in the help output
for opt ; do
command -p grep -q -- '[^[:alnum:]]--'"$opt"'[^[:alnum:]]' help &&
touch -- "$opt"
done
}
# Cache options for bc(1)
options bc \
quiet
# Cache options for ed(1)
options ed \
verbose
# Cache options for grep(1)
options grep \
binary-files \
color \
devices \
directories \
exclude \
exclude-dir
# Cache options for ls(1)
options ls \
almost-all \
block-size \
color \
human-readable \
time-style
)
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