wrong guess about filter mode when running inside Emacs (or Vim)

[damil]

ack 1.92 decides to go into filter mode when (-p STDIN) is true. Filter mode means that input is taken from stdin and not from files given on the command line. But when running inside Emacs, the condition is true because it's an inferior process, and then nothing happens because Emacs doesn't pipe anything into ack STDIN.
So in such a case we don't want the filter behaviour, and therefore we need a way to forcefully disable filter mode from a command line option.
[problem occured with Emacs 22.3.1 on win32, running ack.el version 0.4]

[blixtor]

would be solved with issue 90's --[no]filter option

[lloeki]

Can't believe this is not fixed yet, and that flags like -G get dropped when specified.
Same problem with Gedit external tools.

Workaround: wrap ack in a (python) script that creates a pseudo-terminal on stdin (may not work on non-linux).

#!/usr/bin/env python
import sys, pty
search = sys.stdin.read().strip()
argv = ['ack', search]
pty.spawn(argv)

[jkline-okta]

I get this same error when running ack remotely with sudo:
$ ssh ahost.sleepycat.com -- sudo ack pattern file ack: Ignoring 1 argument on the command-line while acting as a filter.

Problems occurs with ahost running versions:
$ ssh ahost.sleepycat.com -- sudo ack --version ack 1.96 Running under Perl 5.10.1 at /usr/bin/perl

but does not occur when running the same remote command against a different server with ack 1.96 Running under Perl 5.8.8.

[hoelzro]

Addressed in beyondgrep/ack2#346.