lib/ebook_renamer/helpers.rb in ebook_renamer-0.0.2 vs lib/ebook_renamer/helpers.rb in ebook_renamer-0.0.3

@@ -2,19 +2,26 @@
 require 'fileutils'
 require 'shellwords'
 
 module EbookRenamer
   class Helpers
+
+    EbookMetaNotInstall = Class.new(StandardError)
+
     class << self
 
       # Extract meta data from the input file using the ebook-meta tool
       #
       # @param [String] filename the input file name
       # @param [String] binary the executable for use to extract the metadata
       # @return [String] result of the output from running the command
       def meta(filename, binary = 'ebook-meta')
+        binary_path = which(binary)
+
+        raise EbookMetaNotInstall, "Need to install ebook-meta to use this gem" if binary_path.nil?
+
         command = [
-          binary,
+          binary_path,
           Shellwords.escape(filename)
         ]
 
         stdout_str, stderr_str, status = Open3.capture3(command.join(" "))
         raise "Problem processing #{filename}" unless status.success?