Fix formatting untitled file (#65)

* Fix formatting unsaved document
* Add spec for untitled files

spec/scry/formatter_spec.cr

@@ -16,5 +16,14 @@ module Scry
       response = format.run
       response.to_json.should eq(FORMATTER_RESPONSE_EXAMPLE)
     end
+
+    it "check formatter on untitled file" do
+      workspace = Workspace.new("root_uri", 0, 10)
+      workspace.put_file(DidOpenTextDocumentParams.from_json(UNTITLED_FORMATTER_EXAMPLE))
+      text_document, empty_completion = workspace.open_files["Untitled-1"]
+      format = Formatter.new(workspace, text_document)
+      response = format.run
+      response.to_json.should eq(FORMATTER_RESPONSE_EXAMPLE)
+    end
   end
 end

spec/spec_helper.cr

@@ -33,4 +33,6 @@ module Scry
   INITIALIZED_EXAMPLE = %({"jsonrpc": "2.0", "method": "initialized", "params": {}})
 
   COMPLETION_EXAMPLE = %({"jsonrpc": "2.0", "method": "textDocument/completion", "params": #{TEXTDOCUMENT_POSITION_PARAM_EXAMPLE}})
+
+  UNTITLED_FORMATTER_EXAMPLE = %({"textDocument":{"uri":"untitled:Untitled-1","languageId":"crystal","version":1,"text":"1+1"}})
 end

src/scry/text_document.cr

@@ -61,7 +61,7 @@ module Scry
     end
 
     def self.uri_to_filename(uri)
-      uri.sub(/^file:\/\/|^inmemory:\/\/|^git:\/\//, "")
+      uri.sub(/^file:\/\/|^inmemory:\/\/|^git:\/\/|^untitled:/, "")
     end
 
     def in_memory?

src/scry/workspace.cr

@@ -23,9 +23,13 @@ module Scry
 
     def put_file(params : DidOpenTextDocumentParams)
       file = TextDocument.new(params)
-      file_dependencies = @dependency_graph[file.filename].descendants.map &.value
-      method_db = Completion::MethodDB.generate(file_dependencies)
-      @open_files[file.filename] = {file, method_db}
+      if file.untitled?
+        @open_files[file.filename] = {file, Completion::MethodDB.new}
+      else
+        file_dependencies = @dependency_graph[file.filename].descendants.map &.value
+        method_db = Completion::MethodDB.generate(file_dependencies)
+        @open_files[file.filename] = {file, method_db}
+      end
     end
 
     def update_file(params : DidChangeTextDocumentParams)