Rename to propane

lib/propane/cli.rb

@@ -0,0 +1,54 @@
+class Propane
+  module CLI
+
+    USAGE = <<EOF
+Usage: #{$0} [options] <input-file> <output-file>
+Options:
+  --log LOG   Write log file
+  --version   Show program version and exit
+  -h, --help  Show this usage and exit
+EOF
+
+    class << self
+
+      def run(args)
+        params = []
+        log_file = nil
+        i = 0
+        while i < args.size
+          arg = args[i]
+          case arg
+          when "--log"
+            if i + 1 < args.size
+              i += 1
+              log_file = args[i]
+            end
+          when "--version"
+            puts "propane v#{VERSION}"
+            return 0
+          when "-h", "--help"
+            puts USAGE
+            return 0
+          when /^-/
+            $stderr.puts "Error: unknown option #{arg}"
+            return 1
+          else
+            params << arg
+          end
+          i += 1
+        end
+        if params.size != 2
+          $stderr.puts "Error: specify input and output files"
+          return 1
+        end
+        unless File.readable?(params[0])
+          $stderr.puts "Error: cannot read #{params[0]}"
+          return 2
+        end
+        Propane.run(*params, log_file)
+      end
+
+    end
+
+  end
+end