Fix irb_history saved to current directory

doc/irb/indexes.md

@@ -165,9 +165,6 @@ for each entry that is pre-defined, the initial value is given:
 - `:RC`: Whether a {configuration file}[rdoc-ref:IRB@Configuration+File]
   was found and interpreted;
   initial value: `true` if a configuration file was found, `false` otherwise.
-- `:RC_NAME_GENERATOR`: \Proc to generate paths of potential
-  {configuration files}[rdoc-ref:IRB@Configuration+File];
-  initial value: `=> #<Proc:0x000055f9bebfed80 /var/lib/gems/3.0.0/gems/irb-1.8.3/lib/irb/init.rb:401>`.
 - `:SAVE_HISTORY`: Number of commands to save in
   {input command history}[rdoc-ref:IRB@Input+Command+History];
   initial value: `1000`.

lib/irb/command/irb_info.rb

@@ -13,7 +13,7 @@ def execute
         str += "IRB version: #{IRB.version}\n"
         str += "InputMethod: #{IRB.CurrentContext.io.inspect}\n"
         str += "Completion: #{IRB.CurrentContext.io.respond_to?(:completion_info) ? IRB.CurrentContext.io.completion_info : 'off'}\n"
-        rc_files = IRB.rc_files.select { |rc| File.exist?(rc) }
+        rc_files = IRB.irbrc_files
         str += ".irbrc paths: #{rc_files.join(", ")}\n" if rc_files.any?
         str += "RUBY_PLATFORM: #{RUBY_PLATFORM}\n"
         str += "LANG env: #{ENV["LANG"]}\n" if ENV["LANG"] && !ENV["LANG"].empty?

lib/irb/history.rb

@@ -16,8 +16,8 @@ def load_history
       if history_file = IRB.conf[:HISTORY_FILE]
         history_file = File.expand_path(history_file)
       end
-      history_file = IRB.rc_files("_history").first unless history_file
-      if File.exist?(history_file)
+      history_file = IRB.rc_file("_history") unless history_file
+      if history_file && File.exist?(history_file)
         File.open(history_file, "r:#{IRB.conf[:LC_MESSAGES].encoding}") do |f|
           f.each { |l|
             l = l.chomp
@@ -41,7 +41,10 @@ def save_history
         if history_file = IRB.conf[:HISTORY_FILE]
           history_file = File.expand_path(history_file)
         end
-        history_file = IRB.rc_files("_history").first unless history_file
+        history_file = IRB.rc_file("_history") unless history_file
+
+        # When HOME and XDG_CONFIG_HOME are not available, history_file might be nil
+        return unless history_file
 
         # Change the permission of a file that already exists[BUG #7694]
         begin

lib/irb/init.rb

@@ -395,42 +395,54 @@ def IRB.parse_opts(argv: ::ARGV)
   # Run the config file
   def IRB.run_config
     if @CONF[:RC]
-      rc_files.each do |rc|
-        # Because rc_file always returns `HOME/.irbrc` even if no rc file is present, we can't warn users about missing rc files.
-        # Otherwise, it'd be very noisy.
-        load rc if File.exist?(rc)
+      irbrc_files.each do |rc|
+        load rc
       rescue StandardError, ScriptError => e
         warn "Error loading RC file '#{rc}':\n#{e.full_message(highlight: false)}"
       end
     end
   end
 
   IRBRC_EXT = "rc"
-  def IRB.rc_file(ext = IRBRC_EXT)
-    warn "rc_file is deprecated, please use rc_files instead."
-    rc_files(ext).first
-  end
 
-  def IRB.rc_files(ext = IRBRC_EXT)
-    if !@CONF[:RC_NAME_GENERATOR]
-      @CONF[:RC_NAME_GENERATOR] ||= []
-      existing_rc_file_generators = []
+  def IRB.prepare_rc_name_generators
+    return if @existing_rc_name_generators
 
-      rc_file_generators do |rcgen|
-        @CONF[:RC_NAME_GENERATOR] << rcgen
-        existing_rc_file_generators << rcgen if File.exist?(rcgen.call(ext))
+    @existing_rc_name_generators = []
+    @irbrc_files = []
+    rc_file_generators do |rcgen|
+      irbrc = rcgen.call(IRBRC_EXT)
+      if File.exist?(irbrc)
+        @irbrc_files << irbrc
+        @existing_rc_name_generators << rcgen
       end
+    end
+    generate_current_dir_irbrc_files.each do |irbrc|
+      @irbrc_files << irbrc if File.exist?(irbrc)
+    end
+    @irbrc_files.uniq!
+  end
 
-      if existing_rc_file_generators.any?
-        @CONF[:RC_NAME_GENERATOR] = existing_rc_file_generators
-      end
+  def IRB.rc_file(ext)
+    prepare_rc_name_generators
+
+    # When irbrc exist in default location
+    if (rcgen = @existing_rc_name_generators.first)
+      return rcgen.call(ext)
     end
 
-    @CONF[:RC_NAME_GENERATOR].map do |rc|
-      rc_file = rc.call(ext)
-      fail IllegalRCNameGenerator unless rc_file.is_a?(String)
-      rc_file
+    # When irbrc does not exist in default location
+    rc_file_generators do |rcgen|
+      return rcgen.call(ext)
     end
+
+    # When HOME and XDG_CONFIG_HOME are not available
+    nil
+  end
+
+  def IRB.irbrc_files
+    prepare_rc_name_generators
+    @irbrc_files
   end
 
   # enumerate possible rc-file base name generators
@@ -446,13 +458,16 @@ def IRB.rc_file_generators
     end
     if home = ENV["HOME"]
       yield proc{|rc| home+"/.irb#{rc}"}
-      yield proc{|rc| home+"/.config/irb/irb#{rc}"}
+      if xdg_config_home.nil? || xdg_config_home.empty?
+        yield proc{|rc| home+"/.config/irb/irb#{rc}"}
+      end
     end
+  end
+
+  # possible irbrc files in current directory
+  def IRB.generate_current_dir_irbrc_files
     current_dir = Dir.pwd
-    yield proc{|rc| current_dir+"/.irb#{rc}"}
-    yield proc{|rc| current_dir+"/irb#{rc.sub(/\A_?/, '.')}"}
-    yield proc{|rc| current_dir+"/_irb#{rc}"}
-    yield proc{|rc| current_dir+"/$irb#{rc}"}
+    %w[.irbrc irbrc _irbrc $irbrc].map { |file| "#{current_dir}/#{file}" }
   end
 
   # loading modules

lib/irb/lc/error.rb

@@ -47,11 +47,6 @@ def initialize(val)
       super("Undefined prompt mode(#{val}).")
     end
   end
-  class IllegalRCGenerator < StandardError
-    def initialize
-      super("Define illegal RC_NAME_GENERATOR.")
-    end
-  end
 
   # :startdoc:
 end

lib/irb/lc/ja/error.rb

@@ -47,11 +47,6 @@ def initialize(val)
       super("プロンプトモード(#{val})は定義されていません.")
     end
   end
-  class IllegalRCGenerator < StandardError
-    def initialize
-      super("RC_NAME_GENERATORが正しく定義されていません.")
-    end
-  end
 
   # :startdoc:
 end

test/irb/test_command.rb

@@ -20,6 +20,7 @@ def setup
       @xdg_config_home_backup = ENV.delete("XDG_CONFIG_HOME")
       save_encodings
       IRB.instance_variable_get(:@CONF).clear
+      IRB.instance_variable_set(:@existing_rc_name_generators, nil)
       @is_win = (RbConfig::CONFIG['host_os'] =~ /mswin|msys|mingw|cygwin|bccwin|wince|emc/)
     end
 

test/irb/test_history.rb

@@ -17,11 +17,11 @@ def setup
       @backup_irbrc = ENV.delete("IRBRC")
       @backup_default_external = Encoding.default_external
       ENV["HOME"] = @tmpdir
-      IRB.conf[:RC_NAME_GENERATOR] = nil
+      IRB.instance_variable_set(:@existing_rc_name_generators, nil)
     end
 
     def teardown
-      IRB.conf[:RC_NAME_GENERATOR] = nil
+      IRB.instance_variable_set(:@existing_rc_name_generators, nil)
       ENV["HOME"] = @backup_home
       ENV["XDG_CONFIG_HOME"] = @backup_xdg_config_home
       ENV["IRBRC"] = @backup_irbrc
@@ -144,7 +144,7 @@ def test_history_concurrent_use_not_present
       io.class::HISTORY << 'line1'
       io.class::HISTORY << 'line2'
 
-      history_file = IRB.rc_files("_history").first
+      history_file = IRB.rc_file("_history")
       assert_not_send [File, :file?, history_file]
       File.write(history_file, "line0\n")
       io.save_history
@@ -183,6 +183,16 @@ def test_history_does_not_raise_when_history_file_directory_does_not_exist
       IRB.conf[:HISTORY_FILE] = backup_history_file
     end
 
+    def test_no_home_no_history_file_does_not_raise_history_save
+      ENV['HOME'] = nil
+      io = TestInputMethodWithRelineHistory.new
+      assert_nil(IRB.rc_file('_history'))
+      assert_nothing_raised do
+        io.load_history
+        io.save_history
+      end
+    end
+
     private
 
     def history_concurrent_use_for_input_method(input_method)
@@ -217,7 +227,7 @@ def history_concurrent_use_for_input_method(input_method)
     def assert_history(expected_history, initial_irb_history, input, input_method = TestInputMethodWithRelineHistory, locale: IRB::Locale.new)
       IRB.conf[:LC_MESSAGES] = locale
       actual_history = nil
-      history_file = IRB.rc_files("_history").first
+      history_file = IRB.rc_file("_history")
       ENV["HOME"] = @tmpdir
       File.open(history_file, "w") do |f|
         f.write(initial_irb_history)