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"""Machinery for documenting traitlets config options with Sphinx.
This includes:
- A Sphinx extension defining directives and roles for config options.
- A function to generate an rst file given an Application instance.
To make this documentation, first set this module as an extension in Sphinx's
conf.py::
extensions = [
# ...
'traitlets.config.sphinxdoc',
]
Autogenerate the config documentation by running code like this before
Sphinx builds::
from traitlets.config.sphinxdoc import write_doc
from myapp import MyApplication
writedoc('config/options.rst', # File to write
'MyApp config options', # Title
MyApplication()
)
The generated rST syntax looks like this::
.. configtrait:: Application.log_datefmt
Description goes here.
Cross reference like this: :configtrait:`Application.log_datefmt`.
"""
from traitlets import Undefined
from traitlets.utils.text import indent
from collections import defaultdict
from textwrap import indent as _indent, dedent
def setup(app):
"""Registers the Sphinx extension.
You shouldn't need to call this directly; configure Sphinx to use this
module instead.
"""
app.add_object_type('configtrait', 'configtrait', objname='Config option')
metadata = {'parallel_read_safe': True, 'parallel_write_safe': True}
return metadata
def interesting_default_value(dv):
if (dv is None) or (dv is Undefined):
return False
if isinstance(dv, (str, list, tuple, dict, set)):
return bool(dv)
return True
def format_aliases(aliases):
fmted = []
for a in aliases:
dashes = '-' if len(a) == 1 else '--'
fmted.append('``%s%s``' % (dashes, a))
return ', '.join(fmted)
def class_config_rst_doc(cls, trait_aliases):
"""Generate rST documentation for this class' config options.
Excludes traits defined on parent classes.
"""
lines = []
classname = cls.__name__
for k, trait in sorted(cls.class_traits(config=True).items()):
ttype = trait.__class__.__name__
fullname = classname + '.' + trait.name
lines += ['.. configtrait:: ' + fullname,
''
]
help = trait.help.rstrip() or "No description"
lines.append(indent(dedent(help)) + "\n")
# Choices or type
if 'Enum' in ttype:
# include Enum choices
lines.append(
indent(":options: " + ", ".join("``%r``" % x for x in trait.values))
)
else:
lines.append(indent(":trait type: " + ttype))
# Default value
# Ignore boring default values like None, [] or ''
if interesting_default_value(trait.default_value):
try:
dvr = trait.default_value_repr()
except Exception:
dvr = None # ignore defaults we can't construct
if dvr is not None:
if len(dvr) > 64:
dvr = dvr[:61] + '...'
# Double up backslashes, so they get to the rendered docs
dvr = dvr.replace("\\n", "\\\\n")
lines.append(indent(":default: ``%s``" % dvr))
# Command line aliases
if trait_aliases[fullname]:
fmt_aliases = format_aliases(trait_aliases[fullname])
lines.append(indent(":CLI option: " + fmt_aliases))
# Blank line
lines.append('')
return '\n'.join(lines)
def reverse_aliases(app):
"""Produce a mapping of trait names to lists of command line aliases.
"""
res = defaultdict(list)
for alias, trait in app.aliases.items():
res[trait].append(alias)
# Flags also often act as aliases for a boolean trait.
# Treat flags which set one trait to True as aliases.
for flag, (cfg, _) in app.flags.items():
if len(cfg) == 1:
classname = list(cfg)[0]
cls_cfg = cfg[classname]
if len(cls_cfg) == 1:
traitname = list(cls_cfg)[0]
if cls_cfg[traitname] is True:
res[classname+'.'+traitname].append(flag)
return res
def write_doc(path, title, app, preamble=None):
"""Write a rst file documenting config options for a traitlets application.
Parameters
----------
path : str
The file to be written
title : str
The human-readable title of the document
app : traitlets.config.Application
An instance of the application class to be documented
preamble : str
Extra text to add just after the title (optional)
"""
trait_aliases = reverse_aliases(app)
with open(path, 'w') as f:
f.write(title + '\n')
f.write(('=' * len(title)) + '\n')
f.write('\n')
if preamble is not None:
f.write(preamble + '\n\n')
for c in app._classes_inc_parents():
f.write(class_config_rst_doc(c, trait_aliases))
f.write('\n')
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