ohmyzsh/lib/grep.zsh

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# Ignore VCS folders (if the necessary grep flags are available).
VCS_FOLDERS="{.bzr,.cvs,.git,.hg,.svn}"
_setup_grep_alias() {
local GREP_OPTIONS
# Color grep results.
GREP_OPTIONS=(--color=auto)
# Is grep argument $1 available?
grep-flag-available() {
echo | grep $1 "" >/dev/null 2>&1
}
if grep-flag-available --exclude-dir=.cvs; then
GREP_OPTIONS+=(--exclude-dir=$VCS_FOLDERS)
elif grep-flag-available --exclude=.cvs; then
GREP_OPTIONS+=(--exclude=$VCS_FOLDERS)
fi
# Clean up.
unfunction grep-flag-available
# Remove alias and setup function.
unalias grep
setopt localoptions norcexpandparam
eval "grep() {
local options
options=(${(@)GREP_OPTIONS})
# Add '-r' if grepping a dir.
if [[ -d \$@[\$#] ]]; then
options+=(-r)
fi
command grep \$options \"\$@\"
}"
# Run it on first invocation.
grep $GREP_OPTIONS "$@"
}
alias grep=_setup_grep_alias