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"""Implementation of magic functions for IPython's own logging.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (c) 2012 The IPython Development Team.
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#
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# Distributed under the terms of the Modified BSD License.
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#
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# The full license is in the file COPYING.txt, distributed with this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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# Stdlib
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import os
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import sys
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# Our own packages
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from IPython.core.magic import Magics, magics_class, line_magic
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from warnings import warn
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from traitlets import Bool
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#-----------------------------------------------------------------------------
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# Magic implementation classes
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#-----------------------------------------------------------------------------
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@magics_class
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class LoggingMagics(Magics):
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"""Magics related to all logging machinery."""
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quiet = Bool(False, help=
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"""
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Suppress output of log state when logging is enabled
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"""
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).tag(config=True)
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@line_magic
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def logstart(self, parameter_s=''):
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"""Start logging anywhere in a session.
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%logstart [-o|-r|-t|-q] [log_name [log_mode]]
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If no name is given, it defaults to a file named 'ipython_log.py' in your
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current directory, in 'rotate' mode (see below).
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'%logstart name' saves to file 'name' in 'backup' mode. It saves your
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history up to that point and then continues logging.
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%logstart takes a second optional parameter: logging mode. This can be one
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of (note that the modes are given unquoted):
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append
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Keep logging at the end of any existing file.
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backup
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Rename any existing file to name~ and start name.
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global
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Append to a single logfile in your home directory.
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over
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Overwrite any existing log.
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rotate
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Create rotating logs: name.1~, name.2~, etc.
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Options:
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-o
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log also IPython's output. In this mode, all commands which
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generate an Out[NN] prompt are recorded to the logfile, right after
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their corresponding input line. The output lines are always
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prepended with a '#[Out]# ' marker, so that the log remains valid
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Python code.
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Since this marker is always the same, filtering only the output from
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a log is very easy, using for example a simple awk call::
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awk -F'#\\[Out\\]# ' '{if($2) {print $2}}' ipython_log.py
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-r
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log 'raw' input. Normally, IPython's logs contain the processed
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input, so that user lines are logged in their final form, converted
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into valid Python. For example, %Exit is logged as
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_ip.magic("Exit"). If the -r flag is given, all input is logged
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exactly as typed, with no transformations applied.
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-t
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put timestamps before each input line logged (these are put in
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comments).
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-q
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suppress output of logstate message when logging is invoked
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"""
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opts,par = self.parse_options(parameter_s,'ortq')
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log_output = 'o' in opts
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log_raw_input = 'r' in opts
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timestamp = 't' in opts
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quiet = 'q' in opts
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logger = self.shell.logger
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# if no args are given, the defaults set in the logger constructor by
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# ipython remain valid
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if par:
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try:
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logfname,logmode = par.split()
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except:
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logfname = par
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logmode = 'backup'
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else:
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logfname = logger.logfname
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logmode = logger.logmode
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# put logfname into rc struct as if it had been called on the command
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# line, so it ends up saved in the log header Save it in case we need
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# to restore it...
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old_logfile = self.shell.logfile
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if logfname:
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logfname = os.path.expanduser(logfname)
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self.shell.logfile = logfname
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loghead = u'# IPython log file\n\n'
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try:
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logger.logstart(logfname, loghead, logmode, log_output, timestamp,
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log_raw_input)
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except:
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self.shell.logfile = old_logfile
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warn("Couldn't start log: %s" % sys.exc_info()[1])
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else:
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# log input history up to this point, optionally interleaving
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# output if requested
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if timestamp:
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# disable timestamping for the previous history, since we've
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# lost those already (no time machine here).
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logger.timestamp = False
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if log_raw_input:
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input_hist = self.shell.history_manager.input_hist_raw
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else:
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input_hist = self.shell.history_manager.input_hist_parsed
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if log_output:
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log_write = logger.log_write
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output_hist = self.shell.history_manager.output_hist
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for n in range(1,len(input_hist)-1):
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log_write(input_hist[n].rstrip() + u'\n')
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if n in output_hist:
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log_write(repr(output_hist[n]),'output')
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else:
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logger.log_write(u'\n'.join(input_hist[1:]))
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logger.log_write(u'\n')
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if timestamp:
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# re-enable timestamping
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logger.timestamp = True
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if not (self.quiet or quiet):
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print ('Activating auto-logging. '
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'Current session state plus future input saved.')
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logger.logstate()
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@line_magic
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def logstop(self, parameter_s=''):
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"""Fully stop logging and close log file.
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In order to start logging again, a new %logstart call needs to be made,
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possibly (though not necessarily) with a new filename, mode and other
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options."""
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self.shell.logger.logstop()
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@line_magic
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def logoff(self, parameter_s=''):
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"""Temporarily stop logging.
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You must have previously started logging."""
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self.shell.logger.switch_log(0)
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@line_magic
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def logon(self, parameter_s=''):
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"""Restart logging.
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This function is for restarting logging which you've temporarily
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stopped with %logoff. For starting logging for the first time, you
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must use the %logstart function, which allows you to specify an
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optional log filename."""
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self.shell.logger.switch_log(1)
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@line_magic
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def logstate(self, parameter_s=''):
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"""Print the status of the logging system."""
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self.shell.logger.logstate()
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