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Setup grep alias lazily through a function

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This saves an extra / initial call to `grep` during shell startup.
This commit is contained in:
Daniel Hahler 2015-01-07 03:34:22 +01:00
commit fec736f7f6
1 changed files with 20 additions and 19 deletions
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41
lib/grep.zsh
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@ -1,24 +1,25 @@
# is x grep argument available?
grep-flag-available() {
echo | grep $1 "" >/dev/null 2>&1
}
# color grep results
GREP_OPTIONS="--color=auto"
# ignore VCS folders (if the necessary grep flags are available)
# Ignore VCS folders (if the necessary grep flags are available).
VCS_FOLDERS="{.bzr,.cvs,.git,.hg,.svn}"
if grep-flag-available --exclude-dir=.cvs; then
GREP_OPTIONS+=" --exclude-dir=$VCS_FOLDERS"
elif grep-flag-available --exclude=.cvs; then
GREP_OPTIONS+=" --exclude=$VCS_FOLDERS"
fi
_setup_grep_alias() {
# Is grep argument $1 available?
grep-flag-available() {
echo | grep $1 "" >/dev/null 2>&1
}
# export grep settings
alias grep="grep $GREP_OPTIONS"
# Color grep results.
local GREP_OPTIONS="--color=auto"
# clean up
unset GREP_OPTIONS
unset VCS_FOLDERS
unfunction grep-flag-available
if grep-flag-available --exclude-dir=.cvs; then
GREP_OPTIONS+=" --exclude-dir=$VCS_FOLDERS"
elif grep-flag-available --exclude=.cvs; then
GREP_OPTIONS+=" --exclude=$VCS_FOLDERS"
fi
# Re-define alias.
alias grep="grep $GREP_OPTIONS"
# Clean up.
unfunction grep-flag-available
}
alias grep=_setup_grep_alias