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# Return appropriate options for grep
grepopts() {
# Start with ignoring binary files
local -a grepopts=(-I)
# Snarf the output of `grep --help` into a variable
local grephelp=$(grep --help 2>/dev/null)
# If the --exclude option is available, exclude some VCS files
if [[ $grephelp == *--exclude* ]] ; then
for exclude_file in .gitignore .gitmodules ; do
grepopts=("${grepopts[@]}" --exclude="$exclude_file")
done
fi
# If the --exclude-dir option is available, exclude some VCS dirs
if [[ $grephelp == *--exclude-dir* ]] ; then
for exclude_dir in .cvs .git .hg .svn ; do
grepopts=("${grepopts[@]}" --exclude-dir="$exclude_dir")
done
fi
# If the --color option is available and we have a terminal that supports
# at least eight colors, add --color=auto to the options
local colors=$(tput colors 2>/dev/null)
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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