capture process output into history window

[prjemian]

when a process is run now, its output goes to the console

Capture that and add to history window

[prjemian]

perhaps:

• http://www.yasinuludag.com/blog/?p=82
• https://gist.github.com/justinfx/5174795

[prjemian]

Capture is working on Windows but not on Linux for processes that do not immediately return a response, such as caQtDM startup. Looks as if those process quit early; caQtDM does not start. When the caQtDM starter fails here's how:

1. bcdamenu executes configured command which is an external bash shell script in this case
2. the shell script has two lines, a cd command and an internal start bash shell script command
3. the process launched by bcdamenu fails when it reports it cannot find that internal script

But the external script command works both from the command line and from subprocess.Popen().

So, revert back to the subprocess.Popen() and try to grab all console output from the bcdamenu session (all subprocesses) using this (or a variation):

class Capture_stdout(list):
    '''
    capture all printed output (to stdout) into list
    
    # http://stackoverflow.com/questions/16571150/how-to-capture-stdout-output-from-a-python-function-call
    '''
    def __enter__(self):
        sys.stdout.flush()
        self._stdout = sys.stdout
        sys.stdout = self._stringio = StringIO()
        return self

    def __exit__(self, *args):
        self.extend(self._stringio.getvalue().splitlines())
        del self._stringio    # free up some memory
        sys.stdout = self._stdout

and calling it with something such as:

        with Capture_stdout() as printed_lines:
            do_something_that_writes_stdout()

then print(printed_lines) or such

see: http://stackoverflow.com/questions/16571150/how-to-capture-stdout-output-from-a-python-function-call

[prjemian]

The correct way to do this is to make the history panel be a View of the history text buffer (the Model). As the model is updated, the view will refresh.