[utils] Add a '_cwtracehtml' GET parameter to trace self._cw.w() calls (closes #4601327)
The core of this patch is in UStringIO.write(). When tracing is enabled,
write() doesn't just append the 'value' argument to the underlying list.
Instead, a stack trace is recorded and a special HTML "source" is
formatted.
The output with tracing enabled is an HTML page, with the original HTML
escaped, and made clickable to show the stack trace when the write()
call was done.
This allows answering the recurring question: "who wrote this tag
here?!"
from __future__ import absolute_import
import markdown
import logging
log = logging.getLogger(__name__)
def markdown_publish(context, data):
"""publish a string formatted as MarkDown Text to HTML
:type context: a cubicweb application object
:type data: str
:param data: some MarkDown text
:rtype: unicode
:return:
the data formatted as HTML or the original data if an error occurred
"""
md = markdown.Markdown()
try:
return md.convert(data)
except:
import traceback; traceback.print_exc()
log.exception("Error while converting Markdown to HTML")
return data