Add a runnable binary. Closes #1

README.md

@@ -28,6 +28,24 @@ ShortURL.shorten "http://google.com", :isgd    # => "http://is.gd/OwycZW"
 # expand
 ShortURL.expand "http://tinyurl.com/2tx"       # => "http://google.com"
 ```
+
+## Binary
+
+It is possible to use it from command line interface:
+
+```sh
+$ crystal build bin/shorturl && ./shorturl -h
+Usage: shorturl [arguments]
+    -u URL, --url=URL                URL to be shorten
+    -s SERVICE, --service=SERVICE    Shortening service
+    -V, --verbose                    Verbose output
+    -v, --versoin                    Version
+    -h, --help                       Prints this help
+
+$ ./shorturl http://google.com
+http://tinyurl.com/2tx
+```
+
 ## Available services
 
 Here is a list of available shortening services in shorturl.cr:

bin/shorturl

@@ -0,0 +1,3 @@
+require "../src/shorturl/cli.cr"
+
+ShortURL::Cli.run(ARGV)

shard.lock

@@ -0,0 +1,6 @@
+version: 1.0
+shards:
+  webmock:
+    github: manastech/webmock.cr
+    version: 0.4.0
+

spec/shorturl_spec.cr

@@ -9,7 +9,7 @@ module ShortURL
 
   describe ".all_services" do
     it "returns a list of available services names" do
-      ShortURL.all_services.should contain :tinyurl
+      ShortURL.all_services.should contain "tinyurl"
     end
   end
 

src/shorturl.cr

@@ -4,10 +4,11 @@ require "http/client"
 
 module ShortURL
   SERVICES = {
-               isgd:    Services::Isgd.new,
-               tinyurl: Services::TinyURL.new,
-               vgd:     Services::Vgd.new,
-             } of Symbol => Service
+               "isgd":    Services::Isgd.new,
+               "tinyurl": Services::TinyURL.new,
+               "vgd":     Services::Vgd.new,
+               "shorl":   Services::Shorl.new,
+             } of String => Service
 
   # Returns all available shortening services.
   #
@@ -26,10 +27,11 @@ module ShortURL
   # # ...
   # ```
   def self.shorten(url : String, service = :tinyurl)
+    service = service.to_s if service.is_a? Symbol
     if SERVICES.has_key? service
       SERVICES[service].shorten url
     else
-      raise InvalidService.new
+      raise InvalidService.new "Service not exists '#{service}'. Available services: #{SERVICES.keys.join ", "}"
     end
   end
 

src/shorturl/cli.cr

@@ -0,0 +1,49 @@
+require "option_parser"
+require "../shorturl"
+
+module ShortURL
+  class Cli
+    def self.run(args = ARGV)
+      url = nil
+      service = :tinyurl
+      verbose = false
+
+      OptionParser.parse(args) do |parser|
+        parser.banner = "Usage: shorturl [arguments]"
+
+        parser.on("-u URL", "--url=URL", "URL to be shorten") do |u|
+          url = u
+        end
+
+        parser.on("-s SERVICE", "--service=SERVICE", "Shortening service") do |s|
+          service = s.strip.downcase
+        end
+
+        parser.on("-V", "--verbose", "Verbose output") do
+          verbose = true
+        end
+
+        parser.on("-v", "--version", "Version") do
+          puts ShortURL::VERSION
+          exit 0
+        end
+
+        parser.on("-h", "--help", "Prints this help") do
+          puts parser
+          exit 0
+        end
+      end
+
+      url = args.first if url.nil? && !args.empty?
+
+      raise "URL is required" if url.nil?
+
+      puts "Shortening '#{url}'" if verbose
+      puts ShortURL.shorten url.not_nil!, service
+
+    rescue e : Exception
+      puts "Error: #{e.message}"
+      exit 1
+    end
+  end
+end

src/shorturl/version.cr

@@ -1,3 +1,3 @@
 module ShortURL
-  VERSION = "0.1.1"
+  VERSION = "0.2.0"
 end