Add URL to options

spec/parser_spec.cr

@@ -2,7 +2,7 @@ require "./spec_helper"
 
 describe Muse::Dl::Parser do
   it "should parse options" do
-    parser = Muse::Dl::Parser.new(["--no-bookmarks", "--tmp-dir", "/tmp", "--no-cleanup", "--output", "file.pdf"])
+    parser = Muse::Dl::Parser.new(["--no-bookmarks", "--tmp-dir", "/tmp", "--no-cleanup", "--output", "file.pdf", "https://muse.jhu.edu/book/68534"])
     parser.bookmarks.should eq false
     parser.tmp.should eq "/tmp"
     parser.cleanup.should eq false
@@ -10,10 +10,19 @@ describe Muse::Dl::Parser do
   end
 
   it "should have reasonable defaults" do
-    parser = Muse::Dl::Parser.new
+    parser = Muse::Dl::Parser.new(["https://muse.jhu.edu/book/68534"])
     parser.bookmarks.should eq true
     parser.cleanup.should eq true
     parser.tmp.should eq "/tmp"
     parser.output.should eq "tempfilename.pdf"
+    parser.url.should eq "https://muse.jhu.edu/book/68534"
+  end
+
+  it "should raise error on missing options" do
+    begin
+      parser = Muse::Dl::Parser.new([] of String)
+    rescue e : Exception
+      e.class.should eq Muse::Dl::Errors::MissingLink
+    end
   end
 end

src/errors/missing_link.cr

@@ -0,0 +1,4 @@
+module Muse::Dl::Errors
+  class MissingLink < Exception
+  end
+end

src/fetch.cr

@@ -3,7 +3,7 @@ require "./errors/*"
 
 module Muse::Dl
   class Fetch
-    def get_info(url : String) : (Muse::Dl::Book | Muse::Dl::Journal)
+    def self.get_info(url : String) : (Muse::Dl::Book | Muse::Dl::Journal)
       match = /https:\/\/muse.jhu.edu\/(book|journal)\/(\d+)/.match url
       if match
         begin

src/muse-dl.cr

@@ -11,7 +11,11 @@ module Muse::Dl
 
   # TODO: Put your code here
   class Main
-    def self.run
+    def self.run(args : Array(String))
+      parser = Parser.new(args)
+      Fetch.get_info(parser.url)
     end
   end
 end
+
+Muse::Dl::Main.run(ARGV)

src/parser.cr

@@ -1,11 +1,14 @@
+require "./errors/missing_link.cr"
+
 module Muse::Dl
   class Parser
     @bookmarks : Bool
     @tmp : String
     @cleanup : Bool
     @output : String
+    @url : String | Nil
 
-    getter :bookmarks, :tmp, :cleanup, :output
+    getter :bookmarks, :tmp, :cleanup, :output, :url
 
     def find_next(arg : Array(String), flag : String, default)
       search = arg.index flag
@@ -21,6 +24,11 @@ module Muse::Dl
       @cleanup = !arg.index "--no-cleanup"
       @tmp = find_next(arg, "--tmp-dir", "/tmp")
       @output = find_next(arg, "--output", "tempfilename.pdf")
+      begin
+        @url = arg[-1]
+      rescue e : Exception
+        raise Errors::MissingLink.new
+      end
     end
   end
 end