Class: Rails::Generator::Commands::Create
- Defined in:
- lib/rails_generator/commands.rb
Overview
Create is the premier generator command. It copies files, creates directories, renders templates, and more.
Direct Known Subclasses
Instance Attribute Summary
Attributes inherited from Base
#args, #destination_root, #source_root
Attributes included from Options
Instance Method Summary collapse
-
#class_collisions(*class_names) ⇒ Object
Check whether the given class names are already taken by Ruby or Rails.
- #complex_template(relative_source, relative_destination, template_options = {}) ⇒ Object
-
#directory(relative_path) ⇒ Object
Create a directory including any missing parent directories.
-
#file(relative_source, relative_destination, file_options = {}, &block) ⇒ Object
Copy a file from source to destination with collision checking.
-
#identical?(source, destination, &block) ⇒ Boolean
Checks if the source and the destination file are identical.
-
#migration_template(relative_source, relative_destination, template_options = {}) ⇒ Object
When creating a migration, it knows to find the first available file in db/migrate and use the migration.rb template.
-
#readme(*relative_sources) ⇒ Object
Display a README.
- #route_resources(*resources) ⇒ Object
-
#template(relative_source, relative_destination, template_options = {}) ⇒ Object
Generate a file for a Rails application using an ERuby template.
Methods inherited from Base
Methods inherited from Base
#destination_path, #initialize, #manifest, #source_path
Methods included from Options
Constructor Details
This class inherits a constructor from Rails::Generator::Base
Instance Method Details
#class_collisions(*class_names) ⇒ Object
Check whether the given class names are already taken by Ruby or Rails. In the future, expand to check other namespaces such as the rest of the user’s app.
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# File 'lib/rails_generator/commands.rb', line 171 def class_collisions(*class_names) # Initialize some check varibles last_class = Object current_class = nil name = nil class_names.flatten.each do |class_name| # Convert to string to allow symbol arguments. class_name = class_name.to_s # Skip empty strings. class_name.strip.empty? ? next : current_class = class_name # Split the class from its module nesting. nesting = class_name.split('::') name = nesting.pop # Extract the last Module in the nesting. last = nesting.inject(last_class) { |last, nest| break unless last_class.const_defined?(nest) last_class = last_class.const_get(nest) } end # If the last Module exists, check whether the given # class exists and raise a collision if so. if last_class and last_class.const_defined?(name.camelize) raise_class_collision(current_class) end end |
#complex_template(relative_source, relative_destination, template_options = {}) ⇒ Object
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# File 'lib/rails_generator/commands.rb', line 310 def complex_template(relative_source, relative_destination, = {}) = .dup [:assigns] ||= {} [:assigns]['template_for_inclusion'] = render_template_part() template(relative_source, relative_destination, ) end |
#directory(relative_path) ⇒ Object
Create a directory including any missing parent directories. Always skips directories which exist.
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# File 'lib/rails_generator/commands.rb', line 319 def directory(relative_path) path = destination_path(relative_path) if File.exist?(path) logger.exists relative_path else logger.create relative_path unless [:pretend] FileUtils.mkdir_p(path) # git doesn't require adding the paths, adding the files later will # automatically do a path add. # Subversion doesn't do path adds, so we need to add # each directory individually. # So stack up the directory tree and add the paths to # subversion in order without recursion. if [:svn] stack = [relative_path] until File.dirname(stack.last) == stack.last # dirname('.') == '.' stack.push File.dirname(stack.last) end stack.reverse_each do |rel_path| svn_path = destination_path(rel_path) system("svn add -N #{svn_path}") unless File.directory?(File.join(svn_path, '.svn')) end end end end end |
#file(relative_source, relative_destination, file_options = {}, &block) ⇒ Object
Copy a file from source to destination with collision checking.
The file_options hash accepts :chmod and :shebang and :collision options. :chmod sets the permissions of the destination file:
file 'config/empty.log', 'log/test.log', :chmod => 0664
:shebang sets the #!/usr/bin/ruby line for scripts
file 'bin/generate.rb', 'script/generate', :chmod => 0755, :shebang => '/usr/bin/env ruby'
:collision sets the collision option only for the destination file:
file 'settings/server.yml', 'config/server.yml', :collision => :skip
Collisions are handled by checking whether the destination file exists and either skipping the file, forcing overwrite, or asking the user what to do.
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# File 'lib/rails_generator/commands.rb', line 217 def file(relative_source, relative_destination, = {}, &block) # Determine full paths for source and destination files. source = source_path(relative_source) destination = destination_path(relative_destination) destination_exists = File.exist?(destination) # If source and destination are identical then we're done. if destination_exists and identical?(source, destination, &block) return logger.identical(relative_destination) end # Check for and resolve file collisions. if destination_exists # Make a choice whether to overwrite the file. :force and # :skip already have their mind made up, but give :ask a shot. choice = case ([:collision] || [:collision]).to_sym #|| :ask when :ask then force_file_collision?(relative_destination, source, destination, , &block) when :force then :force when :skip then :skip else raise "Invalid collision option: #{[:collision].inspect}" end # Take action based on our choice. Bail out if we chose to # skip the file; otherwise, log our transgression and continue. case choice when :force then logger.force(relative_destination) when :skip then return(logger.skip(relative_destination)) else raise "Invalid collision choice: #{choice}.inspect" end # File doesn't exist so log its unbesmirched creation. else logger.create relative_destination end # If we're pretending, back off now. return if [:pretend] # Write destination file with optional shebang. Yield for content # if block given so templaters may render the source file. If a # shebang is requested, replace the existing shebang or insert a # new one. File.open(destination, 'wb') do |dest| dest.write render_file(source, , &block) end # Optionally change permissions. if [:chmod] FileUtils.chmod([:chmod], destination) end # Optionally add file to subversion or git system("svn add #{destination}") if [:svn] system("git add -v #{relative_destination}") if [:git] end |
#identical?(source, destination, &block) ⇒ Boolean
Checks if the source and the destination file are identical. If passed a block then the source file is a template that needs to first be evaluated before being compared to the destination.
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# File 'lib/rails_generator/commands.rb', line 277 def identical?(source, destination, &block) return false if File.directory? destination source = block_given? ? File.open(source) {|sf| yield(sf)} : IO.read(source) destination = IO.read(destination) source == destination end |
#migration_template(relative_source, relative_destination, template_options = {}) ⇒ Object
When creating a migration, it knows to find the first available file in db/migrate and use the migration.rb template.
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# File 'lib/rails_generator/commands.rb', line 357 def migration_template(relative_source, relative_destination, = {}) migration_directory relative_destination migration_file_name = [:migration_file_name] || file_name raise "Another migration is already named #{migration_file_name}: #{existing_migrations(migration_file_name).first}" if migration_exists?(migration_file_name) template(relative_source, "#{relative_destination}/#{next_migration_string}_#{migration_file_name}.rb", ) end |
#readme(*relative_sources) ⇒ Object
Display a README.
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# File 'lib/rails_generator/commands.rb', line 349 def readme(*relative_sources) relative_sources.flatten.each do |relative_source| logger.readme relative_source puts File.read(source_path(relative_source)) unless [:pretend] end end |
#route_resources(*resources) ⇒ Object
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# File 'lib/rails_generator/commands.rb', line 364 def route_resources(*resources) resource_list = resources.map { |r| r.to_sym.inspect }.join(', ') sentinel = 'ActionController::Routing::Routes.draw do |map|' logger.route "map.resources #{resource_list}" unless [:pretend] gsub_file 'config/routes.rb', /(#{Regexp.escape(sentinel)})/mi do |match| "#{match}\n map.resources #{resource_list}\n" end end end |
#template(relative_source, relative_destination, template_options = {}) ⇒ Object
Generate a file for a Rails application using an ERuby template. Looks up and evaluates a template by name and writes the result.
The ERB template uses explicit trim mode to best control the proliferation of whitespace in generated code. <%- trims leading whitespace; -%> trims trailing whitespace including one newline.
A hash of template options may be passed as the last argument. The options accepted by the file are accepted as well as :assigns, a hash of variable bindings. Example:
template 'foo', 'bar', :assigns => { :action => 'view' }
Template is implemented in terms of file. It calls file with a block which takes a file handle and returns its rendered contents.
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# File 'lib/rails_generator/commands.rb', line 298 def template(relative_source, relative_destination, = {}) file(relative_source, relative_destination, ) do |file| # Evaluate any assignments in a temporary, throwaway binding. vars = [:assigns] || {} b = binding vars.each { |k,v| eval "#{k} = vars[:#{k}] || vars['#{k}']", b } # Render the source file with the temporary binding. ERB.new(file.read, nil, '-').result(b) end end |