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@@ -1,28 +1,37 @@
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-# is x grep argument available?
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-grep-flag-available() {
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- echo | grep $1 "" >/dev/null 2>&1
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-}
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+__GREP_CACHE_FILE="$ZSH_CACHE_DIR"/grep-alias
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-GREP_OPTIONS=""
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+# See if there's a cache file modified in the last day
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+__GREP_ALIAS_CACHES=("$__GREP_CACHE_FILE"(Nm-1))
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+if [[ -z "$__GREP_ALIAS_CACHES" ]]; then
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+ grep-flags-available() {
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+ command grep "$@" "" &>/dev/null <<< ""
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+ }
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-# color grep results
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-if grep-flag-available --color=auto; then
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- GREP_OPTIONS+=" --color=auto"
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-fi
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+ # Ignore these folders (if the necessary grep flags are available)
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+ EXC_FOLDERS="{.bzr,CVS,.git,.hg,.svn,.idea,.tox}"
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-# ignore VCS folders (if the necessary grep flags are available)
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-VCS_FOLDERS="{.bzr,CVS,.git,.hg,.svn}"
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+ # Check for --exclude-dir, otherwise check for --exclude. If --exclude
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+ # isn't available, --color won't be either (they were released at the same
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+ # time (v2.5): http://git.savannah.gnu.org/cgit/grep.git/tree/NEWS?id=1236f007
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+ if grep-flags-available --color=auto --exclude-dir=.cvs; then
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+ GREP_OPTIONS="--color=auto --exclude-dir=$EXC_FOLDERS"
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+ elif grep-flags-available --color=auto --exclude=.cvs; then
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+ GREP_OPTIONS="--color=auto --exclude=$EXC_FOLDERS"
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+ fi
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-if grep-flag-available --exclude-dir=.cvs; then
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- GREP_OPTIONS+=" --exclude-dir=$VCS_FOLDERS"
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-elif grep-flag-available --exclude=.cvs; then
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- GREP_OPTIONS+=" --exclude=$VCS_FOLDERS"
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-fi
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+ {
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+ if [[ -n "$GREP_OPTIONS" ]]; then
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+ # export grep, egrep and fgrep settings
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+ echo "alias grep='grep $GREP_OPTIONS'"
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+ echo "alias egrep='egrep $GREP_OPTIONS'"
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+ echo "alias fgrep='fgrep $GREP_OPTIONS'"
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+ fi
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+ } > "$__GREP_CACHE_FILE"
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-# export grep settings
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-alias grep="grep $GREP_OPTIONS"
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+ # Clean up
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+ unset GREP_OPTIONS EXC_FOLDERS
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+ unfunction grep-flags-available
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+fi
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-# clean up
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-unset GREP_OPTIONS
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-unset VCS_FOLDERS
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-unfunction grep-flag-available
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+source "$__GREP_CACHE_FILE"
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+unset __GREP_CACHE_FILE __GREP_ALIAS_CACHES
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