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substitutefont
--------------
Combine font families
*********************
:Copyright: © 2010, 2023 Günter Milde <milde@users.sf.net>
:Contributor: Special thanks to Ulrike Fischer who provided
the indirect definition with active ``\nfss@catcodes``.
:Licence: This work may be distributed and/or modified under the
conditions of the `LaTeX Project Public License`_,
either version 1.3 of this license or (at your option)
any later version.
.. admonition:: Obsolete:
The package is obsoleted by the LaTeX kernel command
``\DeclareFontFamilySubstitution`` added in the
2020-02 LaTeX release [ltnews31]_.
Existing documents can be updated by removing
``\usepackage{substitutefont}`` and replacing all uses of
``\substitutefont`` with ``\DeclareFontFamilySubstitution``.
Description
===========
In traditional 8-bit LaTeX, fonts are restricted to 256 glyphs per file.
To support different languages and scripts, the New Font Selection Scheme
uses a set of TeX `font encodings` [encguide]_.
Many Latin TeX fonts do not support Greek or Cyrillic, while many
non-Latin fonts are extensions of a Latin font family but use a different
family name due to license reasons or the creators preference.
The `substitutefont` package facilitated the task to set up a font family
as substitute for another one in a specified font encoding.
It is obsoleted by the standard LaTeX kernel command
``\DeclareFontFamilySubstitution``.
Usage
=====
The macro
``\DeclareFontFamilySubstitution{<encoding>}{<family>}{<new-family>}``
selects the font family <new-family> as replacement for <family> in the
font encoding <encoding> [fntguide]_. The substitution must be defined
before the first use of the specified font encoding, preferably in the
document preamble. [#]_
The ``<encoding>`` is one of the LaTeX `font encodings`, e.g., T1 for
Latin, T2A for Cyrillic(Russian), or LGR for Greek [encguide]_.
For ``<family>`` and ``<new-family>``, use the «TeX names» of the font.
They are defined by a TeX font package's ``*.fd`` or ``*.sty`` file(s).
LaTeX stores the default family names for Roman, Sans-Serif, and Teletype
fonts in the ``\rmdefault``, ``\sfdefault``, and ``\ttdefault`` macros
respectively.
.. [#] In contrast to the deprecated ``\substitutefontfamily`` macro
provided by Babel_, ``\substitutefont`` and
``\DeclareFontFamilySubstitution`` do not write auxiliary files.
Examples
========
Set the font family to Palatino using the standard package
`mathpazo` for Latin and `GFS Didot`_ for Greek.
Using the obsolete `substitutefont` package::
\usepackage[sc,slantedGreek]{mathpazo}
\usepackage{substitutefont}
\substitutefont{LGR}{\rmdefault}{udidot}
Using the standard command::
\usepackage[sc,slantedGreek]{mathpazo}
\DeclareFontFamilySubstitution{LGR}{\rmdefault}{udidot}
Example documents:
* Palatino with Greek from `GFS Didot`_:
`<greek-palatino-didot.tex>`__, `<greek-palatino-didot.pdf>`__
* Times/Helvetica/Courier (newtx_) with `GFS Artemisia`_, `GFS
Neohellenic`_, and teletype from the CB_ fonts:
`<greek-times-artemisia.tex>`__, `<greek-times-artemisia.pdf>`__
(see also package txfontsb_)
* Latin Modern with Cyrillic from `CM LGC`_:
`<cyrillic-lm-lgc.tex>`__, `<cyrillic-lm-lgc.pdf>`__
* Times/Helvetica/Courier (TeX Gyre) with Cyrillic ParaType_ fonts:
`<cyrillic-paratype.tex>`__, `<cyrillic-paratype.pdf>`__
* Simple test with Latin fonts:
`<substitutefont-test.tex>`__, `<substitutefont-test.pdf>`__
Source
======
`<substitutefont.sty>`_
The literate source was converted with PyLit_ to reStructuredText_ and
with Docutils_ to the HTML documentation `<substitutefont.sty.html>`__.
References
==========
.. [encguide] Frank Mittelbach, Robin Fairbairns, Werner Lemberg,
LaTeX3 Project Team, `LaTeX font encodings`:
https://mirrors.ctan.org/macros/latex/doc/encguide.pdf.
.. [fntguide] LaTeX3 Project Team, `LaTeX 2e font selection`:
https://mirrors.ctan.org/macros/latex/doc/fntguide.pdf.
.. [ltnews31] `LaATeX News`, Issue 31, February 2020, p. 3:
https://www.latex-project.org/news/latex2e-news/ltnews31.pdf.
.. _LaTeX Project Public License: http://www.latex-project.org/lppl.txt
.. _Babel: https://ctan.org/pkg/babel
.. _CM LGC: https://ctan.org/pkg/cm-lgc
.. _CB: https://ctan.org/pkg/cbgreek-complete
.. _GFS Artemisia: https://ctan.org/pkg/gfsartemisia
.. _GFS Didot: https://ctan.org/pkg/gfsdidot
.. _GFS Neohellenic: https://ctan.org/pkg/gfsneohellenic
.. _mathpazo: https://ctan.org/pkg/mathpazo
.. _newtx: https://ctan.org/pkg/newtx
.. _txfontsb: https://ctan.org/pkg/txfontsb
.. _ParaType: https://ctan.org/pkg/paratype
.. _PyLit: https://pypi.org/project/pylit/
.. _reStructuredText: http://docutils.sourceforge.net/rst.html
.. _Docutils: http://docutils.sourceforge.net/rst.html
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