How to intercept changes in the Console?

For example, you can register ConsoleInputFilterProvider and provide your own InputFilter just to pass all events through it. InputFiter gets 'an event' as String and ConsoleViewContentType where you can tell predefined USER_INPUT from NORMAL_OUTPUT, ERROR_OUTPUT and others.

I have implemented it exactly as you suggested, but unfortunately some events seem to be missing. Here's an example, suppose I execute the following:

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter your name");
String name = br.readLine();
System.out.println("Hello, " + name);

Now, having implemented the provider thus

class ConsoleTracker : ConsoleInputFilterProvider, InputFilter
{
  override fun applyFilter(line: String, type: ConsoleViewContentType?): MutableList<Pair<String, ConsoleViewContentType>>
  {
    println("===== " + line + ";; type = " + type)
    return mutableListOf(Pair(line, type!!))
  }

  override fun getDefaultFilters(project: Project): Array<InputFilter>
  {
    return arrayOf(this)
  }
}

I am expecting the line variable to have the text J, then Jo, then Jon. Instead, when I check the output, I get the following:

===== "C:\Program Files\Java\jdk-9\bin\java" -javaagent:C:\Users\Dmitri\AppData\Local\JetBrains\Toolbox\apps\IDEA-U\ch-0\173.3727.127\lib\idea_rt.jar=38471:C:\Users\Dmitri\AppData\Local\JetBrains\Toolbox\apps\IDEA-U\ch-0\173.3727.127\bin -Dfile.encoding=UTF-8 -classpath C:\Users\Dmitri\IdeaProjects\DeleteMe\out\production\DeleteMe com.company.Main
;; type = SYSTEM_OUTPUT
===== Enter your name
;; type = NORMAL_OUTPUT
===== J;; type = USER_INPUT
=====
;; type = USER_INPUT
===== Hello, Jon
;; type = NORMAL_OUTPUT
=====
Process finished with exit code 0
;; type = SYSTEM_OUTPUT

This... makes no sense. Where is 'Jo' and 'Jon'? Am I doing something wrong?

Yes, now I see, there we have pretty unexpected behavior, namely with USER_INPUT.

We're going to fix the problem soon, thank you!

Can you give me the name of the issue in the tracker so I can subscribe to the updates? Thanks!

https://youtrack.jetbrains.com/issue/IDEA-183871