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# frozen_string_literal: true
# Implements the logic behind the rake tasks for annotations like
#
# rails notes
# rails notes:optimize
#
# and friends. See <tt>rails -T notes</tt> and <tt>railties/lib/rails/tasks/annotations.rake</tt>.
#
# Annotation objects are triplets <tt>:line</tt>, <tt>:tag</tt>, <tt>:text</tt> that
# represent the line where the annotation lives, its tag, and its text. Note
# the filename is not stored.
#
# Annotations are looked for in comments and modulus whitespace they have to
# start with the tag optionally followed by a colon. Everything up to the end
# of the line (or closing ERB comment tag) is considered to be their text.
class SourceAnnotationExtractor
Annotation = Struct.new(:line, :tag, :text) do
def self.directories
@@directories ||= %w(app config db lib test) + (ENV["SOURCE_ANNOTATION_DIRECTORIES"] || "").split(",")
end
# Registers additional directories to be included
# SourceAnnotationExtractor::Annotation.register_directories("spec", "another")
def self.register_directories(*dirs)
directories.push(*dirs)
end
def self.extensions
@@extensions ||= {}
end
# Registers new Annotations File Extensions
# SourceAnnotationExtractor::Annotation.register_extensions("css", "scss", "sass", "less", "js") { |tag| /\/\/\s*(#{tag}):?\s*(.*)$/ }
def self.register_extensions(*exts, &block)
extensions[/\.(#{exts.join("|")})$/] = block
end
register_extensions("builder", "rb", "rake", "yml", "yaml", "ruby") { |tag| /#\s*(#{tag}):?\s*(.*)$/ }
register_extensions("css", "js") { |tag| /\/\/\s*(#{tag}):?\s*(.*)$/ }
register_extensions("erb") { |tag| /<%\s*#\s*(#{tag}):?\s*(.*?)\s*%>/ }
# Returns a representation of the annotation that looks like this:
#
# [126] [TODO] This algorithm is simple and clearly correct, make it faster.
#
# If +options+ has a flag <tt>:tag</tt> the tag is shown as in the example above.
# Otherwise the string contains just line and text.
def to_s(options = {})
s = "[#{line.to_s.rjust(options[:indent])}] ".dup
s << "[#{tag}] " if options[:tag]
s << text
end
end
# Prints all annotations with tag +tag+ under the root directories +app+,
# +config+, +db+, +lib+, and +test+ (recursively).
#
# Additional directories may be added using a comma-delimited list set using
# <tt>ENV['SOURCE_ANNOTATION_DIRECTORIES']</tt>.
#
# Directories may also be explicitly set using the <tt>:dirs</tt> key in +options+.
#
# SourceAnnotationExtractor.enumerate 'TODO|FIXME', dirs: %w(app lib), tag: true
#
# If +options+ has a <tt>:tag</tt> flag, it will be passed to each annotation's +to_s+.
#
# See <tt>#find_in</tt> for a list of file extensions that will be taken into account.
#
# This class method is the single entry point for the rake tasks.
def self.enumerate(tag, options = {})
extractor = new(tag)
dirs = options.delete(:dirs) || Annotation.directories
extractor.display(extractor.find(dirs), options)
end
attr_reader :tag
def initialize(tag)
@tag = tag
end
# Returns a hash that maps filenames under +dirs+ (recursively) to arrays
# with their annotations.
def find(dirs)
dirs.inject({}) { |h, dir| h.update(find_in(dir)) }
end
# Returns a hash that maps filenames under +dir+ (recursively) to arrays
# with their annotations. Only files with annotations are included. Files
# with extension +.builder+, +.rb+, +.rake+, +.yml+, +.yaml+, +.ruby+,
# +.css+, +.js+ and +.erb+ are taken into account.
def find_in(dir)
results = {}
Dir.glob("#{dir}/*") do |item|
next if File.basename(item)[0] == ?.
if File.directory?(item)
results.update(find_in(item))
else
extension = Annotation.extensions.detect do |regexp, _block|
regexp.match(item)
end
if extension
pattern = extension.last.call(tag)
results.update(extract_annotations_from(item, pattern)) if pattern
end
end
end
results
end
# If +file+ is the filename of a file that contains annotations this method returns
# a hash with a single entry that maps +file+ to an array of its annotations.
# Otherwise it returns an empty hash.
def extract_annotations_from(file, pattern)
lineno = 0
result = File.readlines(file, encoding: Encoding::BINARY).inject([]) do |list, line|
lineno += 1
next list unless line =~ pattern
list << Annotation.new(lineno, $1, $2)
end
result.empty? ? {} : { file => result }
end
# Prints the mapping from filenames to annotations in +results+ ordered by filename.
# The +options+ hash is passed to each annotation's +to_s+.
def display(results, options = {})
options[:indent] = results.flat_map { |f, a| a.map(&:line) }.max.to_s.size
results.keys.sort.each do |file|
puts "#{file}:"
results[file].each do |note|
puts " * #{note.to_s(options)}"
end
puts
end
end
end
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