Added --cut option to the command line to allow pruning of the crontab

bin/whenever

@@ -10,6 +10,9 @@ OptionParser.new do |opts|
   opts.banner = "Usage: whenever [options]"
   opts.on('-v', '--version') { puts "Whenever v#{Whenever::VERSION}"; exit(0) }
   opts.on('-w', '--write-crontab') { options[:write] = true }
+  opts.on('-c', '--cut [lines]', 'Cut lines from the top of the cronfile') do |lines|
+    options[:cut] = lines.to_i if lines
+  end
   opts.on('-i', '--update-crontab [identifier]', 'Default: full path to schedule.rb file') do |identifier|
     options[:update] = true
     options[:identifier] = identifier if identifier

lib/whenever/command_line.rb

@@ -12,6 +12,7 @@ module Whenever
       @options = options
       
       @options[:file]       ||= 'config/schedule.rb'
+      @options[:cut]        ||= 0
       @options[:identifier] ||= default_identifier
       
       unless File.exists?(@options[:file])
@@ -23,6 +24,13 @@ module Whenever
         warn("[fail] Can only update, write or clear. Choose one.")
         exit(1)
       end
+
+      unless @options[:cut].to_s =~ /[0-9]*/
+        warn("[fail] Can't cut negative lines from the crontab #{options[:cut]}")
+        exit(1)
+      end
+      @options[:cut] = @options[:cut].to_i
+      
     end
     
     def run
@@ -53,7 +61,7 @@ module Whenever
       command << "-u #{@options[:user]}" if @options[:user]
       
       command_results  = %x[#{command.join(' ')} 2> /dev/null]
-      @current_crontab = $?.exitstatus.zero? ? command_results : ''
+      @current_crontab = $?.exitstatus.zero? ? prepare(command_results) : ''
     end
     
     def write_crontab(contents)
@@ -95,6 +103,11 @@ module Whenever
       end
     end
     
+    # 
+    def prepare(contents)
+      contents.split("\n")[@options[:cut]..-1].join("\n")
+    end
+    
     def comment_base
       "Whenever generated tasks for: #{@options[:identifier]}"
     end

test/functional/command_line_test.rb

@@ -243,4 +243,46 @@ NEW_CRON
     end
   end
 
+  context "prepare-ing the output" do
+    setup do
+      File.expects(:exists?).with('config/schedule.rb').returns(true)
+    end
+
+    should "not trim off the top lines of the file" do
+      @command = Whenever::CommandLine.new(:update => true, :identifier => 'My identifier', :cut => 0)
+      existing = <<-EXISTING_CRON
+# Useless Comments
+# at the top of the file
+
+# Begin Whenever generated tasks for: My identifier
+My whenever job that was already here
+# End Whenever generated tasks for: My identifier
+EXISTING_CRON
+
+      # here-doc adds an extra newline we need removed
+      assert_equal existing.strip, @command.send(:prepare, existing)
+    end
+    
+    should "trim off the top lines of the file" do
+      @command = Whenever::CommandLine.new(:update => true, :identifier => 'My identifier', :cut => '3')
+      existing = <<-EXISTING_CRON
+# Useless Comments
+# at the top of the file
+
+# Begin Whenever generated tasks for: My identifier
+My whenever job that was already here
+# End Whenever generated tasks for: My identifier
+EXISTING_CRON
+
+      new_cron = <<-NEW_CRON
+# Begin Whenever generated tasks for: My identifier
+My whenever job that was already here
+# End Whenever generated tasks for: My identifier
+NEW_CRON
+
+      # here-doc adds an extra newline we need removed
+      assert_equal new_cron.strip, @command.send(:prepare, existing)
+    end
+  end
+
 end