Mongrel::Command::Base

A Command pattern implementation used to create the set of command available to the user from Mongrel. The script uses objects which implement this interface to do the user’s bidding.

Attributes

valid[R]
done_validating[R]
original_args[R]

Public Class Methods

new(options={}) click to toggle source

Called by the subclass to setup the command and parse the argv arguments. The call is destructive on argv since it uses the OptionParser#parse! function.

    # File lib/mongrel/command.rb, line 44
44:       def initialize(options={})
45:         argv = options[:argv] || []
46:         @opt = OptionParser.new
47:         @opt.banner = Mongrel::Command::BANNER
48:         @valid = true
49:         # this is retarded, but it has to be done this way because -h and -v exit
50:         @done_validating = false
51:         @original_args = argv.dup
52: 
53:         configure
54: 
55:         # I need to add my own -h definition to prevent the -h by default from exiting.
56:         @opt.on_tail("-h", "--help", "Show this message") do
57:           @done_validating = true
58:           puts @opt
59:         end
60: 
61:         # I need to add my own -v definition to prevent the -v from exiting by default as well.
62:         @opt.on_tail("--version", "Show version") do
63:           @done_validating = true
64:           if VERSION
65:             puts "Version #{Mongrel::Const::MONGREL_VERSION}"
66:           end
67:         end
68: 
69:         @opt.parse! argv
70:       end

Public Instance Methods

configure() click to toggle source
    # File lib/mongrel/command.rb, line 72
72:       def configure
73:         options []
74:       end
failure(message) click to toggle source

Just a simple method to display failure until something better is developed.

     # File lib/mongrel/command.rb, line 139
139:       def failure(message)
140:         STDERR.puts "!!! #{message}"
141:       end
help() click to toggle source

Returns a help message. Defaults to OptionParser#help which should be good.

    # File lib/mongrel/command.rb, line 82
82:       def help
83:         @opt.help
84:       end
options(opts) click to toggle source

Called by the implemented command to set the options for that command. Every option has a short and long version, a description, a variable to set, and a default value. No exceptions.

    # File lib/mongrel/command.rb, line 32
32:       def options(opts)
33:         # process the given options array
34:         opts.each do |short, long, help, variable, default|
35:           self.instance_variable_set(variable, default)
36:           @opt.on(short, long, help) do |arg|
37:             self.instance_variable_set(variable, arg)
38:           end
39:         end
40:       end
run() click to toggle source

Runs the command doing it’s job. You should implement this otherwise it will throw a NotImplementedError as a reminder.

    # File lib/mongrel/command.rb, line 88
88:       def run
89:         raise NotImplementedError
90:       end
valid?(exp, message) click to toggle source

Validates the given expression is true and prints the message if not, exiting.

     # File lib/mongrel/command.rb, line 94
 94:       def valid?(exp, message)
 95:         if not @done_validating and (not exp)
 96:           failure message
 97:           @valid = false
 98:           @done_validating = true
 99:         end
100:       end
valid_dir?(file, message) click to toggle source

Validates that the given directory exists

     # File lib/mongrel/command.rb, line 114
114:       def valid_dir?(file, message)
115:         valid?(file != nil && File.directory?(file), message)
116:       end
valid_exists?(file, message) click to toggle source

Validates that a file exists and if not displays the message

     # File lib/mongrel/command.rb, line 103
103:       def valid_exists?(file, message)
104:         valid?(file != nil && File.exist?(file), message)
105:       end
valid_file?(file, message) click to toggle source

Validates that the file is a file and not a directory or something else.

     # File lib/mongrel/command.rb, line 109
109:       def valid_file?(file, message)
110:         valid?(file != nil && File.file?(file), message)
111:       end
valid_group?(group) click to toggle source
     # File lib/mongrel/command.rb, line 128
128:       def valid_group?(group)
129:         valid?(@user, "You must also specify a user.")
130:         begin
131:           Etc.getgrnam(group)
132:         rescue
133:           failure "Group does not exist: #{group}"
134:           @valid = false
135:         end
136:       end
valid_user?(user) click to toggle source
     # File lib/mongrel/command.rb, line 118
118:       def valid_user?(user)
119:         valid?(@group, "You must also specify a group.")
120:         begin
121:           Etc.getpwnam(user)
122:         rescue
123:           failure "User does not exist: #{user}"
124:           @valid = false
125:         end
126:       end
validate() click to toggle source

Returns true/false depending on whether the command is configured properly.

    # File lib/mongrel/command.rb, line 77
77:       def validate
78:         return @valid
79:       end

Disabled; run with --debug to generate this.

[Validate]

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