Fixed error with unterminated char literal (#50)

* fixed unterminated char literal not throwing an error. Also fixed spec failure possibly related to latest crystal.

* actually, backwards compatibility on that spec just in case

* using a more descriptive error catch for char literals

* a little reorganization of errors. Unterminated char literal catch shows full error from compiler

spec/integration/icr_spec.cr

@@ -171,7 +171,7 @@ describe "icr command" do
     it "prints runtime error without crashing" do
       input = "\"5a\".to_i"
       output = icr(input)
-      output.should match /Invalid Int32: 5a \(ArgumentError\)/
+      output.should match /invalid Int32: 5a \(ArgumentError\)/i
     end
   end
 
@@ -238,6 +238,13 @@ describe "icr command" do
     icr(input).should match /45/
   end
 
+  it "fails for unterminated char literal" do
+    input = <<-CRYSTAL
+    puts 'aa'
+    CRYSTAL
+    icr(input).should match /\schar\s/
+  end
+
   describe "using constants" do
     it "allows for constant assignment" do
       input = <<-CRYSTAL
@@ -292,6 +299,7 @@ describe "icr command" do
       icr(input).should match /dynamic\sconstant\sassignment/
     end
   end
+
   it "allows for macros" do
     input = <<-CRYSTAL
     macro a_macro

src/icr/console.cr

@@ -76,9 +76,7 @@ module Icr
       when :unexpected_eof, :unterminated_literal
         # If syntax is invalid because of unexpected EOF, or
         # we are still waiting for a closing bracket, keep asking for input
-        next_command_part = ask_for_input(1)
-        new_command = "#{command}\n#{next_command_part}"
-        process_command(new_command)
+        continue_processing(command)
       when :error
         # Give it the second try, validate the command in scope of entire file
         @command_stack.push(command)
@@ -98,6 +96,13 @@ module Icr
       end
     end
 
+    # If the command has been processed, but not complete
+    private def continue_processing(command)
+      next_command_part = ask_for_input(1)
+      new_command = "#{command}\n#{next_command_part}"
+      process_command(new_command)
+    end
+
     private def execute
       result = @executer.execute
       if result.success?
@@ -148,7 +153,11 @@ module Icr
       case err.message.to_s
       when .includes?("EOF")
         SyntaxCheckResult.new(:unexpected_eof)
+      when .includes?("unterminated char literal")
+        # catches error for 'aa' and returns compiler error
+        SyntaxCheckResult.new(:ok)
       when .includes?("unterminated")
+        # catches unterminated hashes and arrays
         SyntaxCheckResult.new(:unterminated_literal)
       else
         SyntaxCheckResult.new(:error, err.message.to_s)