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Performance enhancement for lib/grep

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- Use $ZSH_CACHE_DIR to store the grep alias with all the right features
- Expire the cache after 24 hours
- See issue #8444
This commit is contained in:
mattmc3 2019-11-30 13:49:23 -05:00 committed by Marc Cornellà
parent a8ed1c4e7a
commit 57b178102c
1 changed files with 37 additions and 26 deletions
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51
lib/grep.zsh
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@ -1,29 +1,40 @@
# is x grep argument available? # see if we already cached the grep alias in past day
grep-flag-available() { _grep_alias_cache=("$ZSH_CACHE_DIR"/grep_alias.zsh(Nm-24))
if (( $#_grep_alias_cache )); then
source "$ZSH_CACHE_DIR"/grep_alias.zsh
else
# is x grep argument available?
grep-flag-available() {
echo | grep $1 "" >/dev/null 2>&1 echo | grep $1 "" >/dev/null 2>&1
} }
GREP_OPTIONS="" GREP_OPTIONS=""
# color grep results # color grep results
if grep-flag-available --color=auto; then if grep-flag-available --color=auto; then
GREP_OPTIONS+=" --color=auto" GREP_OPTIONS+=" --color=auto"
fi fi
# ignore these folders (if the necessary grep flags are available) # ignore these folders (if the necessary grep flags are available)
EXC_FOLDERS="{.bzr,CVS,.git,.hg,.svn,.idea,.tox}" EXC_FOLDERS="{.bzr,CVS,.git,.hg,.svn,.idea,.tox}"
if grep-flag-available --exclude-dir=.cvs; then if grep-flag-available --exclude-dir=.cvs; then
GREP_OPTIONS+=" --exclude-dir=$EXC_FOLDERS" GREP_OPTIONS+=" --exclude-dir=$EXC_FOLDERS"
elif grep-flag-available --exclude=.cvs; then elif grep-flag-available --exclude=.cvs; then
GREP_OPTIONS+=" --exclude=$EXC_FOLDERS" GREP_OPTIONS+=" --exclude=$EXC_FOLDERS"
fi
{
# export grep, egrep and fgrep settings
echo alias grep="'grep $GREP_OPTIONS'"
echo alias egrep="'egrep $GREP_OPTIONS'"
echo alias fgrep="'fgrep $GREP_OPTIONS'"
} > "$ZSH_CACHE_DIR/grep_alias.zsh"
source "$ZSH_CACHE_DIR/grep_alias.zsh"
# clean up
unset GREP_OPTIONS EXC_FOLDERS
unfunction grep-flag-available
fi fi
unset _grep_alias_cache
# export grep, egrep and fgrep settings
alias grep="grep $GREP_OPTIONS"
alias egrep="egrep $GREP_OPTIONS"
alias fgrep="fgrep $GREP_OPTIONS"
# clean up
unset GREP_OPTIONS EXC_FOLDERS
unfunction grep-flag-available