ShellVariables module for parser

Find all shell variables in script into array and accessor `variables`

lib/banalize/parser.rb

@@ -1,6 +1,7 @@
 module Banalize
 
   require_relative 'parser/pod_comments'
+  require_relative 'parser/variables'
 
   # Instance attributes
   # -----------
@@ -14,14 +15,16 @@ module Banalize
 
   class Parser
 
-    include Banalize::Parser::PodStyleComments
+    include PodStyleComments
+    include ShellVariables
 
     def initialize path
-      @lines    = IO.read(path).force_encoding("utf-8").split($/)
-      @shebang  = Numbered.new
-      @comments = Numbered.new 
-      @code     = Numbered.new
-
+      @lines     = IO.read(path).force_encoding("utf-8").split($/)
+      @shebang   = Numbered.new
+      @comments  = Numbered.new 
+      @code      = Numbered.new
+      @variables = []
+
       @shebang.add @lines.shift if @lines.first =~ /^#!/
 
       @lines.each_index do |idx|
@@ -37,9 +40,13 @@ def initialize path
         end
       end
       pod_comments
+      shell_variables
 
+      p variables
     end
 
+      # attr_accessor :variables
+
     # Lines of the tested bash file, split by \n's
     attr_accessor :lines
 

lib/banalize/parser/variables.rb

@@ -0,0 +1,29 @@
+module Banalize
+  class Parser
+
+    ##
+    # Parse and detect all shell variables used in script. Set
+    # instance level accessor `variables`.
+    #
+    module ShellVariables
+
+      ##
+      # Parse and detect all shell variables  used in script.
+      #
+      # @return [Array] 
+      def shell_variables
+        ln = code.grep(/\$\{?\w+\}?/).map(&:last).join " "
+
+        vars = ln.scan(/\$\{?\w+\}?/)
+        vars.map! { |x| x.gsub(/[${}]/,'') }
+        vars.reject! { |x| x =~ /^\d$/}
+
+        @variables = vars.uniq!
+      end
+
+      # All variables used in shell script
+      attr_accessor :variables
+
+    end # ShellVariables
+  end # Parser
+end # Banalize