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# encoding: utf-8
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"""
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A payload based version of page.
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Authors:
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* Brian Granger
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* Fernando Perez
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2011 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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# Third-party
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try:
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from docutils.core import publish_string
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except ImportError:
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# html paging won't be available, but we don't raise any errors. It's a
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# purely optional feature.
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pass
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# Our own
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from IPython.core.interactiveshell import InteractiveShell
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#-----------------------------------------------------------------------------
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# Classes and functions
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#-----------------------------------------------------------------------------
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def page(strng, start=0, screen_lines=0, pager_cmd=None,
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html=None, auto_html=False):
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"""Print a string, piping through a pager.
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This version ignores the screen_lines and pager_cmd arguments and uses
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IPython's payload system instead.
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Parameters
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----------
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strng : str
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Text to page.
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start : int
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Starting line at which to place the display.
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html : str, optional
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If given, an html string to send as well.
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auto_html : bool, optional
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If true, the input string is assumed to be valid reStructuredText and is
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converted to HTML with docutils. Note that if docutils is not found,
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this option is silently ignored.
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Notes
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-----
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Only one of the ``html`` and ``auto_html`` options can be given, not
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both.
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"""
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# Some routines may auto-compute start offsets incorrectly and pass a
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# negative value. Offset to 0 for robustness.
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start = max(0, start)
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shell = InteractiveShell.instance()
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if auto_html:
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try:
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# These defaults ensure user configuration variables for docutils
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# are not loaded, only our config is used here.
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defaults = {'file_insertion_enabled': 0,
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'raw_enabled': 0,
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'_disable_config': 1}
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html = publish_string(strng, writer_name='html',
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settings_overrides=defaults)
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except:
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pass
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payload = dict(
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source='IPython.kernel.zmq.page.page',
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text=strng,
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html=html,
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start_line_number=start
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)
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shell.payload_manager.write_payload(payload)
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def install_payload_page():
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"""Install this version of page as IPython.core.page.page."""
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from IPython.core import page as corepage
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corepage.page = page
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