Fixing spawn() for large outputs but leaving several questions about …

…the fix

src/AsciiDocProvider.ts

@@ -173,9 +173,22 @@ export default class AsciiDocProvider implements TextDocumentContentProvider {
                     errorMessage += "Go to `File -> Preferences -> User settings` and adjust the AsciiDoc.asciidoctor_command</b>"
                     resolve(this.errorSnippet(errorMessage));
                 })
+
+                var result_data = ''
                 asciidoctor.stdout.on('data', (data) => {
-                    let result = this.fixLinks(data.toString(), doc.fileName);
-                    resolve(this.buildPage(result));
+                    const string_data =  data.toString();
+                    const received_len =  Buffer.byteLength(string_data);
+                    /* This seems to work for large outputs, but several questions remains:
+                    Is there a 64k limit from nodejs in the data received ?
+                    Or is it depend on the ascidoctor output buffering/flush mechanism ?
+                    Will the concatenation work across multiple async stdout.on calls ?
+                    */
+                    if(received_len < 65536)
+                    {
+                        resolve(this.buildPage(this.fixLinks(result_data + string_data, doc.fileName)));
+                    }
+                    else
+                        result_data += string_data
                 });
                 asciidoctor.stdin.write(text);
                 asciidoctor.stdin.end();

test/samples/simple.adoc

@@ -6,7 +6,7 @@ Preview as you type, including formatting like *this*, or _this_.
 == You can also add your custom CSS style
 It will automatically refresh, just as you type
 
-== Heading level 2kv
+== Heading level 2
 Diferrente heading levels are easly procuded with the # symbol .
 You can also do _italic_ or *bold* like in the more common mark down.