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# Function returns calculated options for grep
__grepopts() {
# Declare options array
local -a grepopts
# Snarf the output of `grep --help` into a variable
local grephelp=$(grep --help 2>/dev/null)
# Add option to ignore binary files
grepopts[${#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 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 -i 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 __grepopts
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