Merge pull request #3403 from mcornella/fix-grep-library

Fix grep.zsh library

lib/grep.zsh

-#
-# Color grep results
-# Examples: http://rubyurl.com/ZXv
-#
-
-GREP_OPTIONS="--color=auto"
-
-# avoid VCS folders (if the necessary grep flags are available)
+# is x grep argument available?
 grep-flag-available() {
     echo | grep $1 "" >/dev/null 2>&1
 }
+
+# color grep results
+GREP_OPTIONS="--color=auto"
+
+# ignore VCS folders (if the necessary grep flags are available)
+VCS_FOLDERS="{.bzr,.cvs,.git,.hg,.svn}"
+
 if grep-flag-available --exclude-dir=.cvs; then
-    for PATTERN in .cvs .git .hg .svn; do
-        GREP_OPTIONS+=" --exclude-dir=$PATTERN"
-    done
+    GREP_OPTIONS+=" --exclude-dir=$VCS_FOLDERS"
 elif grep-flag-available --exclude=.cvs; then
-    for PATTERN in .cvs .git .hg .svn; do
-        GREP_OPTIONS+=" --exclude=$PATTERN"
-    done
+    GREP_OPTIONS+=" --exclude=$VCS_FOLDERS"
 fi
-unfunction grep-flag-available
 
-export GREP_OPTIONS="$GREP_OPTIONS"
-export GREP_COLOR='1;32'
+# export grep settings
+alias grep="grep $GREP_OPTIONS"
+
+# clean up
+unset GREP_OPTIONS
+unset VCS_FOLDERS
+unfunction grep-flag-available