Filtering terminal commands on linux
finite.automaton at gmail.com
Fri Jul 29 21:38:28 CEST 2005
Firstly, there's probably a better way to do whatever you're trying to
do w.r.t cd/dvd burning. I'm not familiar with gear, but its webpage
lists "Batch file scripting capability" as a feature, which suggests
that you might be able to do what you want without parsing output
intended for humans. There are also a multitude of command-line cd and
dvd utilities for Linux which might be better for scripting.
That said, it shouldn't be too hard to craft a regular expression that
matches ANSI control sequences. Using
http://www.dee.ufcg.edu.br/~rrbrandt/tools/ansi.html as a reference,
here's how to do this for the first few control sequences...
esc = '\x1B'
start_control_sequence = esc + '['
Pn = r'\d+' # Numeric parameter
Ps = '%s(;%s)*' % (Pn,Pn) # Selective parameter
PL = Pn
Pc = Pn
control_sequences = [
PL + ';' + Pc + '[Hf]', # Cursor position
Pn + '[ABCD]', # Cursor up|down|forward|backward
's', # Save cursor position
'u', # Restore cursor position
'2J', # Erase display
'K', # Erase line
Ps + 'm', # Set graphics mode
'=' + Pn + '[hl]', # Set|Reset mode
# ... etc
match_ansi = re.compile(start_control_sequence +
'(' + '|'.join(control_sequences) + ')')
(note: code is untested.. may contain typos)
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