Added vercomp function

dev/ofunctions.sh

@@ -3,7 +3,7 @@
 #### OFUNCTIONS MINI SUBSET ####
 
 _OFUNCTIONS_VERSION=2.1-RC1+dev
-_OFUNCTIONS_BUILD=2017010401
+_OFUNCTIONS_BUILD=2017020301
 #### _OFUNCTIONS_BOOTSTRAP SUBSET ####
 _OFUNCTIONS_BOOTSTRAP=true
 #### _OFUNCTIONS_BOOTSTRAP SUBSET END ####
@@ -1790,4 +1790,37 @@ function ParentPid {
 	fi
 }
 
+# Neat version compare function found at http://stackoverflow.com/a/4025065/2635443
+# Returns 0 if equal, 1 if $1 > $2 and 2 if $1 < $2
+vercomp () {
+    if [[ $1 == $2 ]]
+    then
+        return 0
+    fi
+    local IFS=.
+    local i ver1=($1) ver2=($2)
+    # fill empty fields in ver1 with zeros
+    for ((i=${#ver1[@]}; i<${#ver2[@]}; i++))
+    do
+        ver1[i]=0
+    done
+    for ((i=0; i<${#ver1[@]}; i++))
+    do
+        if [[ -z ${ver2[i]} ]]
+        then
+            # fill empty fields in ver2 with zeros
+            ver2[i]=0
+        fi
+        if ((10#${ver1[i]} > 10#${ver2[i]}))
+        then
+            return 1
+        fi
+        if ((10#${ver1[i]} < 10#${ver2[i]}))
+        then
+            return 2
+        fi
+    done
+    return 0
+}
+
 #### OFUNCTIONS FULL SUBSET END ####