Replace Ruby pseudo-code coverage report with file-centric format

The `rdoc -C` coverage report previously displayed undocumented items
using Ruby syntax (`class ... end`, `def ...; end`). For C source files
like Ruby's object.c, this made the output appear as if the C file was
being treated as a Ruby script.

Replace with a file-centric listing that groups undocumented items by
source file and type:

    object.c:
      Class:
        Refinement
      Method:
        Module#name object.c:135
          Undocumented params: mod.name->stringornil

- Group items by source file, sorted alphabetically
- Within each file, group by type (Class, Module, Constant, Attribute, Method)
- Sort items by line number within each type group
- Use ClassName#method / ClassName.method notation
- Show clickable file:line references, column-aligned
- Return plain strings from report/summary instead of Markup objects

Author: st0012

lib/rdoc/rdoc.rb

@@ -497,7 +497,7 @@ def document(options)
     if @options.coverage_report then
       puts
 
-      puts @stats.report.accept RDoc::Markup::ToRdoc.new
+      puts @stats.report
     elsif file_info.empty? then
       $stderr.puts "\nNo newer files." unless @options.quiet
     else
@@ -510,7 +510,7 @@ def document(options)
 
     if @stats and (@options.coverage_report or not @options.quiet) then
       puts
-      puts @stats.summary.accept RDoc::Markup::ToRdoc.new
+      puts @stats.summary
     end
 
     exit @stats.fully_documented? if @options.coverage_report

lib/rdoc/stats.rb

@@ -7,6 +7,12 @@ class RDoc::Stats
 
   include RDoc::Text
 
+  TYPE_ORDER = %w[Class Module Constant Attribute Method].freeze
+  GREAT_JOB_MESSAGE = <<~MSG
+    100% documentation!
+    Great Job!
+  MSG
+
   ##
   # Output level for the coverage report
 
@@ -193,17 +199,6 @@ def fully_documented?
     @fully_documented
   end
 
-  ##
-  # A report that says you did a great job!
-
-  def great_job
-    report = RDoc::Markup::Document.new
-
-    report << RDoc::Markup::Paragraph.new('100% documentation!')
-    report << RDoc::Markup::Paragraph.new('Great Job!')
-
-    report
-  end
 
   ##
   # Calculates the percentage of items documented.
@@ -230,164 +225,167 @@ def report
     if @coverage_level.zero? then
       calculate
 
-      return great_job if @num_items == @doc_items
+      return GREAT_JOB_MESSAGE if @num_items == @doc_items
     end
 
-    ucm = @store.unique_classes_and_modules
+    items, empty_classes = collect_undocumented_items
 
-    report = RDoc::Markup::Document.new
-    report << RDoc::Markup::Paragraph.new('The following items are not documented:')
-    report << RDoc::Markup::BlankLine.new
-
-    ucm.sort.each do |cm|
-      body = report_class_module(cm) {
-        [
-          report_constants(cm),
-          report_attributes(cm),
-          report_methods(cm),
-        ].compact
-      }
+    if @coverage_level > 0 then
+      calculate
 
-      report << body if body
+      return GREAT_JOB_MESSAGE if @num_items == @doc_items
     end
 
-    if @coverage_level > 0 then
-      calculate
+    report = +""
+    report << "The following items are not documented:\n\n"
 
-      return great_job if @num_items == @doc_items
+    # Referenced-but-empty classes
+    empty_classes.each do |cm|
+      report << "#{cm.full_name} is referenced but empty.\n"
+      report << "It probably came from another project.  I'm sorry I'm holding it against you.\n\n"
     end
 
-    report
-  end
+    # Group items by file, then by type
+    by_file = items.group_by { |item| item[:file] }
 
-  ##
-  # Returns a report on undocumented attributes in ClassModule +cm+
+    by_file.sort_by { |file, _| file }.each do |file, file_items|
+      report << "#{file}:\n"
 
-  def report_attributes(cm)
-    return if cm.attributes.empty?
+      by_type = file_items.group_by { |item| item[:type] }
 
-    report = []
+      TYPE_ORDER.each do |type|
+        next unless by_type[type]
+
+        report << "  #{type}:\n"
+
+        sorted = by_type[type].sort_by { |item| [item[:line] || 0, item[:name]] }
+        name_width = sorted.reduce(0) { |max, item| item[:line] && item[:name].length > max ? item[:name].length : max }
+
+        sorted.each do |item|
+          if item[:line]
+            report << "    %-*s %s:%d\n" % [name_width, item[:name], item[:file], item[:line]]
+          else
+            report << "    #{item[:name]}\n"
+          end
+
+          if item[:undoc_params]
+            report << "      Undocumented params: #{item[:undoc_params].join(', ')}\n"
+          end
+        end
+      end
 
-    cm.attributes.each do |attr|
-      next if attr.documented?
-      line = attr.line ? ":#{attr.line}" : nil
-      report << "  #{attr.definition} :#{attr.name} # in file #{attr.file.full_name}#{line}\n"
       report << "\n"
     end
 
     report
   end
 
   ##
-  # Returns a report on undocumented items in ClassModule +cm+
+  # Collects all undocumented items across all classes and modules.
+  # Returns [items, empty_classes] where items is an Array of Hashes
+  # with keys :type, :name, :file, :line, and empty_classes is an
+  # Array of ClassModule objects that are referenced but have no files.
 
-  def report_class_module(cm)
-    return if cm.fully_documented? and @coverage_level.zero?
-    return unless cm.display?
+  def collect_undocumented_items
+    empty_classes = []
+    items = []
 
-    report = RDoc::Markup::Document.new
+    @store.unique_classes_and_modules.each do |cm|
+      next unless cm.display?
 
-    if cm.in_files.empty? then
-      report << RDoc::Markup::Paragraph.new("#{cm.definition} is referenced but empty.")
-      report << RDoc::Markup::Paragraph.new("It probably came from another project.  I'm sorry I'm holding it against you.")
-
-      return report
-    elsif cm.documented? then
-      documented = true
-      klass = RDoc::Markup::Verbatim.new("#{cm.definition} # is documented\n")
-    else
-      report << RDoc::Markup::Paragraph.new('In files:')
-
-      list = RDoc::Markup::List.new :BULLET
-
-      cm.in_files.each do |file|
-        para = RDoc::Markup::Paragraph.new file.full_name
-        list << RDoc::Markup::ListItem.new(nil, para)
+      if cm.in_files.empty?
+        empty_classes << cm
+        next
       end
 
-      report << list
-      report << RDoc::Markup::BlankLine.new
+      unless cm.documented? || cm.full_name == 'Object'
+        file = cm.in_files.first&.full_name
+        items << { type: cm.type.capitalize, name: cm.full_name, file: file, line: nil } if file
+      end
 
-      klass = RDoc::Markup::Verbatim.new("#{cm.definition}\n")
+      collect_undocumented_constants(cm, items)
+      collect_undocumented_attributes(cm, items)
+      collect_undocumented_methods(cm, items)
     end
 
-    klass << "\n"
-
-    body = yield.flatten # HACK remove #flatten
-
-    if body.empty? then
-      return if documented
+    [items, empty_classes]
+  end
 
-      klass.parts.pop
-    else
-      klass.parts.concat body
-    end
+  ##
+  # Collects undocumented constants from +cm+ into +items+.
 
-    klass << "end\n"
+  def collect_undocumented_constants(cm, items)
+    cm.constants.each do |constant|
+      next if constant.documented? || constant.is_alias_for
 
-    report << klass
+      file = constant.file&.full_name
+      next unless file
 
-    report
+      items << {
+        type: "Constant",
+        name: constant.full_name,
+        file: file,
+        line: constant.line,
+      }
+    end
   end
 
   ##
-  # Returns a report on undocumented constants in ClassModule +cm+
+  # Collects undocumented attributes from +cm+ into +items+.
 
-  def report_constants(cm)
-    return if cm.constants.empty?
-
-    report = []
+  def collect_undocumented_attributes(cm, items)
+    cm.attributes.each do |attr|
+      next if attr.documented?
 
-    cm.constants.each do |constant|
-      # TODO constant aliases are listed in the summary but not reported
-      # figure out what to do here
-      next if constant.documented? || constant.is_alias_for
+      file = attr.file&.full_name
+      next unless file
 
-      line = constant.line ? ":#{constant.line}" : line
-      report << "  # in file #{constant.file.full_name}#{line}\n"
-      report << "  #{constant.name} = nil\n"
-      report << "\n"
+      scope = attr.singleton ? "." : "#"
+      items << {
+        type: "Attribute",
+        name: "#{cm.full_name}#{scope}#{attr.name}",
+        file: file,
+        line: attr.line,
+      }
     end
-
-    report
   end
 
   ##
-  # Returns a report on undocumented methods in ClassModule +cm+
-
-  def report_methods(cm)
-    return if cm.method_list.empty?
-
-    report = []
+  # Collects undocumented methods from +cm+ into +items+.
+  # At coverage level > 0, also counts undocumented parameters.
 
+  def collect_undocumented_methods(cm, items)
     cm.each_method do |method|
-      next if method.documented? and @coverage_level.zero?
+      next if method.documented? && @coverage_level.zero?
 
-      if @coverage_level > 0 then
-        params, undoc = undoc_params method
+      undoc_param_names = nil
 
+      if @coverage_level > 0
+        params, undoc = undoc_params method
         @num_params += params
 
-        unless undoc.empty? then
+        unless undoc.empty?
           @undoc_params += undoc.length
-
-          undoc = undoc.map do |param| "+#{param}+" end
-          param_report = "  # #{undoc.join ', '} is not documented\n"
+          undoc_param_names = undoc
         end
       end
 
-      next if method.documented? and not param_report
+      next if method.documented? && !undoc_param_names
 
-      line = method.line ? ":#{method.line}" : nil
-      scope = method.singleton ? 'self.' : nil
+      file = method.file&.full_name
+      next unless file
 
-      report << "  # in file #{method.file.full_name}#{line}\n"
-      report << param_report if param_report
-      report << "  def #{scope}#{method.name}#{method.params}; end\n"
-      report << "\n"
-    end
+      scope = method.singleton ? "." : "#"
+      item = {
+        type: "Method",
+        name: "#{cm.full_name}#{scope}#{method.name}",
+        file: file,
+        line: method.line,
+      }
+      item[:undoc_params] = undoc_param_names if undoc_param_names
 
-    report
+      items << item
+    end
   end
 
   ##
@@ -407,12 +405,10 @@ def summary
       @undoc_params,
     ].max.to_s.length
 
-    report = RDoc::Markup::Verbatim.new
+    report = +""
 
     report << "Files:      %*d\n" % [num_width, @num_files]
-
     report << "\n"
-
     report << "Classes:    %*d (%*d undocumented)\n" % [
       num_width, @num_classes, undoc_width, @undoc_classes]
     report << "Modules:    %*d (%*d undocumented)\n" % [
@@ -426,17 +422,14 @@ def summary
     report << "Parameters: %*d (%*d undocumented)\n" % [
       num_width, @num_params, undoc_width, @undoc_params] if
         @coverage_level > 0
-
     report << "\n"
-
     report << "Total:      %*d (%*d undocumented)\n" % [
       num_width, @num_items, undoc_width, @undoc_items]
-
     report << "%6.2f%% documented\n" % percent_doc
     report << "\n"
     report << "Elapsed: %0.1fs\n" % (Time.now - @start)
 
-    RDoc::Markup::Document.new report
+    report
   end
 
   ##