(GH-139) Add more intelligence to completion request

Previously the completion provider blindly moved the cursor one place back which
worked fine if completions were triggered by a character instead of manual.
Now that the LSP has provisions for the context of the completion request we
can intelligently figure out when to remove the trigger character.

This commit updates the mesasge handler to pass through the CompletionContext
object and the completion provider can then determine how to use the context
accordingly.  This commit also updates the tests for this behaviour.

lib/puppet-languageserver/manifest/completion_provider.rb

@@ -5,15 +5,18 @@ module Manifest
     module CompletionProvider
       def self.complete(content, line_num, char_num, options = {})
         options = {
-          :tasks_mode => false
+          :tasks_mode => false,
+          :context    => nil # LSP::CompletionContext object
         }.merge(options)
         items = []
         incomplete = false
+        is_trigger_char = !options[:context].nil? && options[:context].triggerKind == LSP::CompletionTriggerKind::TRIGGERCHARACTER
 
         result = PuppetLanguageServer::PuppetParserHelper.object_under_cursor(content, line_num, char_num,
-                                                                              :multiple_attempts  => true,
-                                                                              :disallowed_classes => [Puppet::Pops::Model::QualifiedName, Puppet::Pops::Model::BlockExpression],
-                                                                              :tasks_mode         => options[:tasks_mode])
+                                                                              :multiple_attempts   => true,
+                                                                              :disallowed_classes  => [Puppet::Pops::Model::QualifiedName, Puppet::Pops::Model::BlockExpression],
+                                                                              :tasks_mode          => options[:tasks_mode],
+                                                                              :remove_trigger_char => is_trigger_char)
         if result.nil?
           # We are in the root of the document.
 

lib/puppet-languageserver/message_handler.rb

@@ -105,10 +105,11 @@ def request_textdocument_completion(_, json_rpc_message)
       line_num = json_rpc_message.params['position']['line']
       char_num = json_rpc_message.params['position']['character']
       content = documents.document(file_uri)
+      context = json_rpc_message.params['context'].nil? ? nil : LSP::CompletionContext.new(json_rpc_message.params['context'])
 
       case documents.document_type(file_uri)
       when :manifest
-        return PuppetLanguageServer::Manifest::CompletionProvider.complete(content, line_num, char_num, :tasks_mode => PuppetLanguageServer::DocumentStore.plan_file?(file_uri))
+        return PuppetLanguageServer::Manifest::CompletionProvider.complete(content, line_num, char_num, :context => context, :tasks_mode => PuppetLanguageServer::DocumentStore.plan_file?(file_uri))
       else
         raise "Unable to provide completion on #{file_uri}"
       end

spec/languageserver/integration/puppet-languageserver/manifest/completion_provider_spec.rb

@@ -116,6 +116,7 @@ def create_ensurable_property
 
     context "Given a simple valid manifest" do
       let(:content) { <<-EOT
+
 class Alice {
 
   user { 'Bob':
@@ -143,7 +144,7 @@ class Alice {
         let(:char_num) { 0 }
         let(:expected_types) { ['keyword','resource_type','function','resource_class'] }
 
-        [0, 8].each do |line_num|
+        [0, 9].each do |line_num|
           it "should return a list of keyword, resource_type, function, resource_class regardless of cursor location (Testing line #{line_num})" do
             result = subject.complete(content, line_num, char_num)
 
@@ -160,7 +161,7 @@ class Alice {
 
       [
         { :name => 'class', :line_num => 1 },
-        { :name => 'defined type', :line_num => 18 },
+        { :name => 'defined type', :line_num => 19 },
       ].each do |testcase|
         describe "When inside the root of a #{testcase[:name]}" do
           let(:char_num) { 0 }
@@ -181,7 +182,7 @@ class Alice {
       end
 
       describe "When inside the root of a resource" do
-        let(:line_num) { 11 }
+        let(:line_num) { 12 }
         let(:char_num) { 0 }
         let(:expected_types) { ['resource_parameter','resource_property'] }