resolves #262 warn if file in include macro doesn't exist

2 files changed, 20 insertions, 2 deletions

diff --git a/lib/asciidoctor/reader.rb b/lib/asciidoctor/reader.rb
index 7302bd02..31e353bf 100644
--- a/lib/asciidoctor/reader.rb
+++ b/lib/asciidoctor/reader.rb
@@ -441,6 +441,13 @@ class Reader
     # FIXME currently we're not checking the upper bound of the include depth
     elsif @document.attributes.fetch('include-depth', 0).to_i > 0
       advance
+      # FIXME this borks line numbers
+      include_file = @document.normalize_asset_path(target, 'include file')
+      if !File.file?(include_file)
+        puts "asciidoctor: WARNING: line #{@lineno}: include file not found: #{include_file}"
+        return true
+      end
+
       lines = nil
       tags = nil
       if !raw_attributes.empty?
@@ -466,8 +473,6 @@ class Reader
           tags = attributes['tags'].split(/[,;]/).uniq
         end
       end
-      # FIXME this borks line numbers
-      include_file = @document.normalize_asset_path(target, 'include file')
       if !lines.nil?
         if !lines.empty?
           selected = []
diff --git a/test/reader_test.rb b/test/reader_test.rb
index 0d7f1418..0372096f 100644
--- a/test/reader_test.rb
+++ b/test/reader_test.rb
@@ -173,6 +173,19 @@ include::fixtures/include-file.asciidoc[]
       assert_match(/included content/, output)
     end
 
+    test 'missing file referenced by include macro does not crash processor' do
+      input = <<-EOS
+include::fixtures/no-such-file.ad[]
+      EOS
+
+      begin
+        doc = document_from_string input, :safe => Asciidoctor::SafeMode::SAFE, :attributes => {'docdir' => File.dirname(__FILE__)}
+        assert_equal 0, doc.blocks.size
+      rescue => e
+        flunk('include macro should not raise exception on missing file')
+      end
+    end
+
     test 'include macro supports line selection' do
       input = <<-EOS
 include::fixtures/include-file.asciidoc[lines=1;3..4;6..-1]