ability to provide line number for spec

in the same manner as rspec, the line number may be provided directly after the
file name or by explicitely passing a cli argument

lib/guard/jasmine/cli.rb

@@ -65,6 +65,11 @@ class CLI < Thor
                     aliases: '-d',
                     desc:    'The directory with the Jasmine specs'
 
+      method_option :line_number,
+                    type:    :numeric,
+                    aliases: '-l',
+                    desc:    'The line which identifies the spec to be run'
+
       method_option :url,
                     type:    :string,
                     aliases: '-u',
@@ -166,6 +171,7 @@ def spec(*paths)
         runner_options                            = {}
         runner_options[:port]                     = options.port || CLI.find_free_server_port
         runner_options[:spec_dir]                 = options.spec_dir || (File.exists?(File.join('spec', 'javascripts')) ? File.join('spec', 'javascripts') : 'spec')
+        runner_options[:line_number]              = options.line_number
         runner_options[:server]                   = options.server.to_sym == :auto ? ::Guard::Jasmine::Server.detect_server(runner_options[:spec_dir]) : options.server.to_sym
         runner_options[:server_mount]             = options.mount || (defined?(JasmineRails) ? '/specs' : '/jasmine')
         runner_options[:jasmine_url]              = options.url || "http://localhost:#{ runner_options[:port] }#{ options.server.to_sym == :jasmine_gem ? '/' : runner_options[:server_mount] }"

lib/guard/jasmine/runner.rb

@@ -155,10 +155,24 @@ def query_string_for_suite(file, options)
 
           query_string = ''
 
-          File.foreach(file) do |line|
-            if line =~ /describe\s*[("']+(.*?)["')]+/
-              query_string = "?spec=#{ $1 }"
-              break
+          if options[:line_number].to_s =~ /\A(\d+)$/ || file =~/\A[^:]+:(\d+)$/
+            line_number = $1.to_i
+
+            spec = File.readlines(file)[0, line_number].
+              map(&:strip).
+              select { |x| x.start_with?('it') || x.start_with?('describe') }.
+              map { |x| x[/['"](.+?)['"]/, 1] }.
+              join(' ')
+
+            if spec && !spec.empty?
+              query_string = "?spec=#{ spec }"
+            end
+          else
+            File.foreach(file) do |line|
+              if line =~ /describe\s*[("']+(.*?)["')]+/
+                query_string = "?spec=#{ $1 }"
+                break
+              end
             end
           end
 

spec/guard/jasmine/cli_spec.rb

@@ -45,6 +45,11 @@
           cli.start(['spec', '--spec-dir', 'specs'])
         end
 
+        it 'sets the line number' do
+          runner.should_receive(:run).with(anything(), hash_including(line_number: 1)).and_return [true, []]
+          cli.start(['spec', '--line-number', 1])
+        end
+
         it 'detects the server type' do
           server.should_receive(:detect_server).with('specs')
           cli.start(['spec', '--spec-dir', 'specs'])
@@ -274,6 +279,11 @@
           cli.start(['spec'])
         end
 
+        it 'sets the line number' do
+          runner.should_receive(:run).with(anything(), hash_including(line_number: nil)).and_return [true, []]
+          cli.start(['spec'])
+        end
+
         it 'disables the focus mode' do
           runner.should_receive(:run).with(anything(), hash_including(focus: false)).and_return [true, []]
           cli.start(['spec', '-f', 'false'])

spec/guard/jasmine/runner_spec.rb

@@ -211,6 +211,40 @@
       end
     end
 
+    context 'when passed a line number' do
+      before do
+        File.stub(:readlines).and_return([
+          'describe "TestContext", ->',
+          '  it "does something", ->',
+          '    # some assertion'
+        ])
+      end
+
+      context 'with the spec file name' do
+        it 'executes the example for line number on example' do
+          IO.should_receive(:popen).with("#{ phantomjs_command } \"http://localhost:8888/jasmine?spec=TestContext%20does%20something\" 60000 failure true failure failure false true ''", "r:UTF-8")
+          runner.run(['spec/javascripts/a.js.coffee:2'], defaults)
+        end
+
+        it 'executes the example for line number within example' do
+          IO.should_receive(:popen).with("#{ phantomjs_command } \"http://localhost:8888/jasmine?spec=TestContext%20does%20something\" 60000 failure true failure failure false true ''", "r:UTF-8")
+          runner.run(['spec/javascripts/a.js.coffee:3'], defaults)
+        end
+
+        it 'executes all examples within describe' do
+          IO.should_receive(:popen).with("#{ phantomjs_command } \"http://localhost:8888/jasmine?spec=TestContext\" 60000 failure true failure failure false true ''", "r:UTF-8")
+          runner.run(['spec/javascripts/a.js.coffee:1'], defaults)
+        end
+      end
+
+      context 'with the cli argument' do
+        it 'executes the example for line number on example' do
+          IO.should_receive(:popen).with("#{ phantomjs_command } \"http://localhost:8888/jasmine?spec=TestContext%20does%20something\" 60000 failure true failure failure false true ''", "r:UTF-8")
+          runner.run(['spec/javascripts/a.js.coffee'], defaults.merge(line_number: 2))
+        end
+      end
+    end
+
     context 'when passed the spec directory' do
       it 'requests all jasmine specs from the server' do
         IO.should_receive(:popen).with("#{ phantomjs_command } \"http://localhost:8888/jasmine\" 60000 failure true failure failure false true ''", "r:UTF-8")