(GH-289) Make Format On Type file size configurable

Previously only files that were less than 4KB in size could use the
format-on-type feature. This commit updates the Language Server to honor a
new configuration setting puppet.editorService.formatOnType.maxFileSize which
will determine the maximum file size.  A size of 0 will disable the size check.
The default is 4096 as per the previous behaviour.

No specific tests have been added and has been manually tested.

lib/puppet-languageserver/manifest/format_on_type_provider.rb

@@ -11,14 +11,16 @@ def instance
         end
       end
 
-      def format(content, line, char, trigger_character, formatting_options)
+      def format(content, line, char, trigger_character, formatting_options, max_filesize = 4096)
         result = []
         # Abort if the user has pressed something other than `>`
         return result unless trigger_character == '>'
         # Abort if the formatting is tab based. Can't do that yet
         return result unless formatting_options['insertSpaces'] == true
         # Abort if content is too big
-        return result if content.length > 4096
+        unless max_filesize.zero?
+          return result if content.length > max_filesize
+        end
 
         lexer = PuppetLint::Lexer.new
         tokens = lexer.tokenise(content)

lib/puppet-languageserver/message_handler.rb

@@ -232,7 +232,8 @@ def request_textdocument_ontypeformatting(_, json_rpc_message)
           line_num,
           char_num,
           json_rpc_message.params['ch'],
-          json_rpc_message.params['options']
+          json_rpc_message.params['options'],
+          language_client.format_on_type_filesize_limit
         )
       else
         raise "Unable to format on type on #{file_uri}"

lib/puppet-languageserver/session_state/language_client.rb

@@ -7,6 +7,7 @@ class LanguageClient
 
       # Client settings
       attr_reader :format_on_type
+      attr_reader :format_on_type_filesize_limit
       attr_reader :use_puppetfile_resolver
 
       def initialize(message_handler)
@@ -25,6 +26,7 @@ def initialize(message_handler)
 
         # Default settings
         @format_on_type = false
+        @format_on_type_filesize_limit = 4096
         @use_puppetfile_resolver = true
       end
 
@@ -58,6 +60,9 @@ def parse_lsp_configuration_settings!(settings = {})
           end
           @format_on_type = value
         end
+        # format on type file size
+        value = safe_hash_traverse(settings, 'puppet', 'editorService', 'formatOnType', 'maxFileSize')
+        @format_on_type_filesize_limit = to_integer(value, 4096, 0)
         # use puppetfile resolver
         value = safe_hash_traverse(settings, 'puppet', 'validate', 'resolvePuppetfiles')
         @use_puppetfile_resolver = to_boolean(value)
@@ -174,6 +179,18 @@ def to_boolean(value)
         value.to_s =~ %r{^(true|t|yes|y|1)$/i}
       end
 
+      def to_integer(value, default = nil, min = nil, max = nil)
+        return default if value.nil?
+        begin
+          intv = Integer(value)
+          return default if !min.nil? && intv < min
+          return default if !max.nil? && intv > max
+          intv
+        rescue ArgumentError
+          default
+        end
+      end
+
       def new_request_id
         SecureRandom.uuid
       end