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author | Kasper Timm Hansen <kaspth@gmail.com> | 2016-09-26 20:28:40 +0200 |
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committer | GitHub <noreply@github.com> | 2016-09-26 20:28:40 +0200 |
commit | c994a893c18c0456fd2a30efe4debfc2b18e2508 (patch) | |
tree | 0253b1343a1760dc4701f7d2ee2ff8cdd1d1b290 /railties/lib/rails/command/behavior.rb | |
parent | a6da7938017647dd6e19e23d3d47126cb7a3e1fe (diff) | |
parent | c0c73738bd04c86fbcf6d22c961fec0d33aa2bf6 (diff) | |
download | rails-c994a893c18c0456fd2a30efe4debfc2b18e2508.tar.gz rails-c994a893c18c0456fd2a30efe4debfc2b18e2508.tar.bz2 rails-c994a893c18c0456fd2a30efe4debfc2b18e2508.zip |
Merge pull request #26414 from rails/rails-commands
Initial Rails Commands Infrastructure
Diffstat (limited to 'railties/lib/rails/command/behavior.rb')
-rw-r--r-- | railties/lib/rails/command/behavior.rb | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/railties/lib/rails/command/behavior.rb b/railties/lib/rails/command/behavior.rb new file mode 100644 index 0000000000..ce994746a4 --- /dev/null +++ b/railties/lib/rails/command/behavior.rb @@ -0,0 +1,123 @@ +require "active_support" + +module Rails + module Command + module Behavior #:nodoc: + extend ActiveSupport::Concern + + class_methods do + # Remove the color from output. + def no_color! + Thor::Base.shell = Thor::Shell::Basic + end + + # Track all command subclasses. + def subclasses + @subclasses ||= [] + end + + protected + + # This code is based directly on the Text gem implementation. + # Copyright (c) 2006-2013 Paul Battley, Michael Neumann, Tim Fletcher. + # + # Returns a value representing the "cost" of transforming str1 into str2. + def levenshtein_distance(str1, str2) + s = str1 + t = str2 + n = s.length + m = t.length + + return m if (0 == n) + return n if (0 == m) + + d = (0..m).to_a + x = nil + + # avoid duplicating an enumerable object in the loop + str2_codepoint_enumerable = str2.each_codepoint + + str1.each_codepoint.with_index do |char1, i| + e = i+1 + + str2_codepoint_enumerable.with_index do |char2, j| + cost = (char1 == char2) ? 0 : 1 + x = [ + d[j+1] + 1, # insertion + e + 1, # deletion + d[j] + cost # substitution + ].min + d[j] = e + e = x + end + + d[m] = x + end + + x + end + + # Prints a list of generators. + def print_list(base, namespaces) #:nodoc: + return if namespaces.empty? + puts "#{base.camelize}:" + + namespaces.each do |namespace| + puts(" #{namespace}") + end + + puts + end + + # Receives namespaces in an array and tries to find matching generators + # in the load path. + def lookup(namespaces) #:nodoc: + paths = namespaces_to_paths(namespaces) + + paths.each do |raw_path| + lookup_paths.each do |base| + path = "#{base}/#{raw_path}_#{command_type}" + + begin + require path + return + rescue LoadError => e + raise unless e.message =~ /#{Regexp.escape(path)}$/ + rescue Exception => e + warn "[WARNING] Could not load #{command_type} #{path.inspect}. Error: #{e.message}.\n#{e.backtrace.join("\n")}" + end + end + end + end + + # This will try to load any command in the load path to show in help. + def lookup! #:nodoc: + $LOAD_PATH.each do |base| + Dir[File.join(base, *file_lookup_paths)].each do |path| + begin + path = path.sub("#{base}/", "") + require path + rescue Exception + # No problem + end + end + end + end + + # Convert namespaces to paths by replacing ":" for "/" and adding + # an extra lookup. For example, "rails:model" should be searched + # in both: "rails/model/model_generator" and "rails/model_generator". + def namespaces_to_paths(namespaces) #:nodoc: + paths = [] + namespaces.each do |namespace| + pieces = namespace.split(":") + paths << pieces.dup.push(pieces.last).join("/") + paths << pieces.join("/") + end + paths.uniq! + paths + end + end + end + end +end |