108 lines
3.1 KiB
Ruby
108 lines
3.1 KiB
Ruby
module Whenever
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class CommandLine
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def self.execute(options={})
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new(options).run
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end
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def initialize(options={})
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@options = options
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@options[:file] ||= 'config/schedule.rb'
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@options[:identifier] ||= default_identifier
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unless File.exists?(@options[:file])
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warn("[fail] Can't find file: #{@options[:file]}")
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exit(1)
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end
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if @options[:update] && @options[:write]
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warn("[fail] Can't update AND write. choose one.")
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exit(1)
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end
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end
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def run
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if @options[:update]
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write_crontab(updated_crontab)
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elsif @options[:write]
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write_crontab(whenever_cron)
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else
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puts Whenever.cron(@options)
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exit
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end
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end
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protected
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def default_identifier
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File.expand_path(@options[:file])
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end
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def whenever_cron
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@whenever_cron ||= [comment_open, Whenever.cron(@options), comment_close].join("\n")
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end
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def read_crontab
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return @current_crontab if @current_crontab
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command = ['crontab -l']
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command << "-u #{@options[:user]}" if @options[:user]
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command_results = %x[#{command.join(' ')} 2> /dev/null]
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@current_crontab = $?.exitstatus.zero? ? command_results : ''
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end
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def write_crontab(contents)
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tmp_cron_file = Tempfile.new('whenever_tmp_cron').path
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File.open(tmp_cron_file, File::WRONLY | File::APPEND) do |file|
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file << contents
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end
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command = ['crontab']
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command << "-u #{@options[:user]}" if @options[:user]
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command << tmp_cron_file
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if system(command.join(' '))
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action = 'written' if @options[:write]
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action = 'updated' if @options[:update]
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puts "[write] crontab file #{action}"
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exit
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else
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warn "[fail] Couldn't write crontab; try running `whenever' with no options to ensure your schedule file is valid."
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exit(1)
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end
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end
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def updated_crontab
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# Check for unopened or unclosed identifier blocks
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if read_crontab.index(comment_open) && !read_crontab.index(comment_close)
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warn "[fail] Unclosed indentifier; Your crontab file contains '#{comment_open}', but no '#{comment_close}'"
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exit(1)
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elsif !read_crontab.index(comment_open) && read_crontab.index(comment_close)
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warn "[fail] Unopened indentifier; Your crontab file contains '#{comment_close}', but no '#{comment_open}'"
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exit(1)
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end
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# If an existing identier block is found, replace it with the new cron entries
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if read_crontab.index(comment_open) && read_crontab.index(comment_close)
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read_crontab.gsub(Regexp.new("#{comment_open}.+#{comment_close}", Regexp::MULTILINE), whenever_cron)
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else # Otherwise, append the new cron entries after any existing ones
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[read_crontab, whenever_cron].join("\n\n")
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end
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end
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def comment_base
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"Whenever generated tasks for: #{@options[:identifier]}"
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end
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def comment_open
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"# Begin #{comment_base}"
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end
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def comment_close
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"# End #{comment_base}"
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end
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end
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end |