Use pure-bash for version parsing

Instead of using "expr" and "cut", use bash regex & substitution
so that we can properly parse the version in an array.

src/tools.sh

@@ -1,14 +1,17 @@
 #!/usr/bin/env bash
-gnomeVersion="$(expr \
-    "$(LANGUAGE=en_US.UTF-8 gnome-terminal --version)" : \
-    '^[^[:digit:]]* \(\([[:digit:]]*\.*\)*\)' \
-)"
+
+gnomeVersion=($(
+    version_string=$(LANGUAGE=en_US.UTF-8 gnome-terminal --version)
+    [[ $version_string =~ ([0-9]+((\.[0-9]+)*)) ]] && version=${BASH_REMATCH[1]}
+    echo ${version//./ }
+))
 
 # newGnome=1 if the gnome-terminal version >= 3.8
-if [[ ("$(echo "$gnomeVersion" | cut -d"." -f1)" = "3" && \
-       "$(echo "$gnomeVersion" | cut -d"." -f2)" -ge 8) || \
-       "$(echo "$gnomeVersion" | cut -d"." -f1)" -ge 4 ]]
-  then newGnome="1"
+if [[ 
+    ( ${gnomeVersion[0]} -eq 3 && ${gnomeVersion[1]} -ge 8 )
+    || ${gnomeVersion[0]} -ge 4
+]]; then
+  newGnome="1"
   dconfdir=/org/gnome/terminal/legacy/profiles:
 else
   newGnome=0