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# Return appropriate options for grep
grepopts() {
# Snarf the output of `grep --help` into a variable
local grephelp=$(grep --help 2>/dev/null)
# Start collecting available options
local -a grepopts
# Add option to ignore binary files
grepopts=("${grepopts[@]}" '-I')
# If the --exclude option is available, exclude some VCS files
if [[ $grephelp == *--exclude* ]] ; then
grepopts=("${grepopts[@]}" '--exclude=.git{,ignore,modules}')
fi
# If the --exclude-dir option is available, exclude some VCS dirs
if [[ $grephelp == *--exclude-dir* ]] ; then
grepopts=("${grepopts[@]}" '--exclude-dir=.{cvs,git,hg,svn}')
fi
# If the --color option is available and we have a terminal that supports
# at least eight colors, add --color=auto to the options
local colors=$(tput colors)
if [[ $grephelp == *--color* ]] && ((colors >= 8)) ; then
grepopts=("${grepopts[@]}" '--color=auto')
fi
# Print the options as a single string, space-delimited
printf %s "${grepopts[*]}"
}
# Alias grep with those options
alias grep="grep $(grepopts)"
# Unset helper function
unset -f grepopts
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