The tools.ietf.org subdomain is being wound down and services are moving to
datatracker.ietf.org. Links to RFC documents using the old subdomain are being
redirected to datatracker; this updates the configured `rfc_base_url` to
point to the current subdomain.
Discussion: https://mailarchive.ietf.org/arch/msg/ietf/0n-6EXEmkTp3Uv_vj-5Vnm3o0bo/
Keep imports alphabetically sorted and their order homogeneous across
Python source files.
The isort project has more feature and is more active than the
flake8-import-order plugin.
Most issues caught were simply import ordering from the same module.
Where imports were purposefully placed out of order, tag with
isort:skip.
Refs: #6890
The comma character is not TeX-escaped because it is frequent in general
text and escaping it would make the LaTeX output larger for only dealing
with the problem of the LaTeX-ligature of ,, into a single character.
And one there is problem with the commas in options to Verbatim from
PygmentsBridge.
The hyphen character is escaped (not in ids and URIs!) to
\sphinxhyphen{} for both Unicode and non-Unicode engines. This is needed
to work around hyperref transforming -- and --- from section titles into
EN DASH resp. EM DASH in PDF bookmarks.
https://github.com/latex3/hyperref/issues/112
Note to expert LaTeX users: if Sphinx latex user with xelatex has
- turned off Smart Quotes for some reason,
- but does want TeX ligatures and thus overrode Sphinx
latex_elements['fontenc'] default (since #6888) to this effect,
then this should be added to LaTeX preamble:
\def\sphinxhyphen#1{-}% (\protected is now not needed)
\let\sphinxhyphenforbookmarks\sphinxhyphen
In Python 3, the default encoding of source files is utf-8. The encoding
cookie is now unnecessary and redundant so remove it. For more details,
see the docs:
https://docs.python.org/3/howto/unicode.html#the-string-type
> The default encoding for Python source code is UTF-8, so you can
> simply include a Unicode character in a string literal ...
Includes a fix for the flake8 header checks to stop expecting an
encoding cookie.
0. do not escape Unicode Greek letters via LaTeX math mark-up: pass them
through un-modified to LaTeX document,
1. if "fontenc" receives extra option LGR, then pdflatex will support
Unicode Greek letters (not in math), and with extra option T2A it
will support (most) Unicode Cyrillic letters.
2. for pdflatex with LGR, this will use "textalpha" LaTeX package and
"substitutefont" package to set up some automatic font substitution
to work around the unavailability of Greek with "times"
package (which is default font package chosen by Sphinx for
pdflatex), same with T2A and "substitutefont" for Cyrillic.
3. for xelatex/lualatex, set up Computer Modern Unicode as default font,
as it supports Cyrillic and Greek scripts,
4. for platex, don't do anything special as the engine already has
its default font supporting Cyrillic and Greek (even in math mode!)
Closes: #5251
Fixes: #5248
Fixes: #5247
Since #2627 (1.4.4), `\code`, and then again at #3116 (1.5)
`\sphinxcode` which is the new name has become more complicated than the
original `\texttt{#1}`. This was to obtain straight quotes in PDF output,
and to allow long inline literals to break across lines.
This means though that users who want to customize `\sphinxcode`, for
example to not only do `\texttt` but to use some colour, have to copy
about 10 lines of complicated LaTeX macros which should be not modified
in any way. This commit moves all the code out of `\sphinxcode` into a
separate macro `\sphinxupquote`.
The LaTeX writer will output `\sphinxcode{\sphinxupquote{foo}}` in place
of former `\sphinxcode{foo}`. Moving the `\texttt` from innermost to
outermost level is with no consequence.
