clear the crontab

bin/whenever

@@ -14,6 +14,10 @@ OptionParser.new do |opts|
     options[:update] = true
     options[:identifier] = identifier if identifier
   end
+  opts.on('-c', '--clear-crontab [identifier]') do |identifier|
+    options[:clear] = true
+    options[:identifier] = identifier if identifier
+  end
   opts.on('-f', '--load-file [schedule file]', 'Default: config/schedule.rb') do |file|
     options[:file] = file if file
   end

lib/whenever/command_line.rb

@@ -19,14 +19,14 @@ module Whenever
         exit(1)
       end
 
-      if @options[:update] && @options[:write]
+      if [@options[:update], @options[:write], @options[:clear]].compact.length > 1
-        warn("[fail] Can't update AND write. choose one.")
+        warn("[fail] Can only update, write or delete. choose one.")
         exit(1)
       end
     end
     
     def run
-      if @options[:update]
+      if @options[:update] || @options[:clear]
         write_crontab(updated_crontab)
       elsif @options[:write]
         write_crontab(whenever_cron)
@@ -43,7 +43,7 @@ module Whenever
     end
   
     def whenever_cron
-      @whenever_cron ||= [comment_open, Whenever.cron(@options), comment_close].join("\n") + "\n"
+      @whenever_cron ||= [comment_open, (Whenever.cron(@options) unless @options[:clear]), comment_close].compact.join("\n") + "\n"
     end
     
     def read_crontab

test/command_line_test.rb

@@ -74,6 +74,63 @@ EXISTING_CRON
 #{@task}
 # End Whenever generated tasks for: My identifier
 
+# Begin Whenever generated tasks for: Other identifier
+This shouldn't get replaced
+# End Whenever generated tasks for: Other identifier
+NEW_CRON
+      
+      assert_equal new_cron, @command.send(:updated_crontab)
+      
+      @command.expects(:write_crontab).with(new_cron).returns(true)
+      assert @command.run
+    end
+  end
+
+  context "A command line delete" do
+    setup do
+      File.expects(:exists?).with('config/schedule.rb').returns(true)
+      @command = Whenever::CommandLine.new(:clear => true, :identifier => 'My identifier')
+      @task = "#{two_hours} /my/command"
+    end
+
+    should "add an empty identifier block if there is no existing one" do
+      existing = '# Existing crontab'
+      @command.expects(:read_crontab).at_least_once.returns(existing)
+      
+      new_cron = <<-EXPECTED
+#{existing}
+
+# Begin Whenever generated tasks for: My identifier
+# End Whenever generated tasks for: My identifier
+EXPECTED
+      
+      assert_equal new_cron, @command.send(:updated_crontab)
+      
+      @command.expects(:write_crontab).with(new_cron).returns(true)
+      assert @command.run
+    end
+    
+    should "delete an existing block if the identifier matches" do
+      existing = <<-EXISTING_CRON
+# Something
+
+# Begin Whenever generated tasks for: My identifier
+My whenever job that was already here
+# End Whenever generated tasks for: My identifier
+
+# Begin Whenever generated tasks for: Other identifier
+This shouldn't get replaced
+# End Whenever generated tasks for: Other identifier
+EXISTING_CRON
+
+      @command.expects(:read_crontab).at_least_once.returns(existing)
+      
+      new_cron = <<-NEW_CRON
+# Something
+
+# Begin Whenever generated tasks for: My identifier
+# End Whenever generated tasks for: My identifier
+
 # Begin Whenever generated tasks for: Other identifier
 This shouldn't get replaced
 # End Whenever generated tasks for: Other identifier
@@ -98,4 +155,23 @@ NEW_CRON
     end
   end
 
+  context "combined params" do
+    setup do
+      Whenever::CommandLine.any_instance.expects(:exit)
+      Whenever::CommandLine.any_instance.expects(:warn)
+      File.expects(:exists?).with('config/schedule.rb').returns(true)
+    end
+
+    should "exit with write and clear" do
+      @command = Whenever::CommandLine.new(:write => true, :clear => true)
+    end
+    
+    should "exit with write and update" do
+      @command = Whenever::CommandLine.new(:write => true, :update => true)
+    end
+
+    should "exit with update and clear" do
+      @command = Whenever::CommandLine.new(:update => true, :clear => true)
+    end
+  end
 end