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ifptex Package Bundle
=====================
TeX: To check the engine is pTeX (or its derivatives)
The ifptex package is a counterpart of ifxetex, ifluatex, etc. for
the pTeX engine. The ifuptex package is an alises to ifptex provided
for backward compatibility.
### System Requirements
* TeX format: plain TeX, LaTeX, and INI mode.
* TeX engine: Anything.
* DVI driver (in DVI mode): Anything.
* Dependent packages:
- iftex
### Installation
In a system compliant to TDS 1.1, move the files as follows:
- `*.sty` → $TEXMF/tex/generic/ifptex
And rehash your TEXMF trees if necessary.
### License
This package is distributed under the MIT License.
ifptex Package ― Test for pTeX engine
--------------------------------------
### Package Loading
In plain TeX:
\input ifptex.sty
In LaTeX:
\usepackage{ifptex}
### Usage
NB: Here “e-TeX-ness” is not considered.
* `\ifptex` (or `\ifpTeX`) [if-token]
Whether the engine is pTeX (including upTeX or pTeX-ng).
* `\ifstrictptex` (or `\ifstrictpTeX`) [if-token]
Whether the engine is pTeX but *not* upTeX or pTeX-ng.
* `\ifuptex` (or `\ifupTeX`) [if-token]
Whether the engine is upTeX (including pTeX-ng).
* `\ifstrictuptex` (or `\ifstrictupTeX`) [if-token]
Whether the engine is upTeX but *not* pTeX-ng.
* `\ifnativeuptex` (or `\ifnativeupTeX`) [if-token]
Whether the engine is upTeX and its internal encoding is Unicode.
* `\ifptexng` (or `\ifpTeXng`) [if-token]
Whether the engine is pTeX-ng.
* `\RequirepTeX`
Issues an error if `\ifpTeX` fails.
* `\RequireStrictpTeX`
Issues an error if `\ifstrictpTeX` fails.
* `\RequireupTeX`
Issues an error if `\ifupTeX` fails.
* `\RequireStrictupTeX`
Issues an error if `\ifstrictupTeX` fails.
* `\RequireNativeupTeX`
Issues an error if `\ifnativeupTeX` fails.
* `\RequirepTeXng`
Issues an error if `\ifpTeXng` fails.
* `\upTeXguessedversion` [mathchardef-token]
The guessed value of upTeX version; given as a 100-folded integer.
NB. On version 1.23 or later, the value is correct.
NB. On a non-upTeX engine, the value is zero.
* `\RequireupTeXAtLeast{<required>}`
Issues an error if `\upTeXguessedversion` is smaller than the given
required value.
* `\RequireNativeupTeXAtLeast{<required>}`
Issues an error either if `\upTeXguessedversion` is smaller than
the given required value or if `\ifnativeupTeX` fails.
ifuptex Package ― Alias of ifptex
----------------------------------
The ifuptex package does nothing but loading ifptex internally. It is
provided for backward compatibility.
### Package Loading
In plain TeX:
\input ifuptex.sty
In LaTeX:
\usepackage{ifuptex}
### Usage
Just the same as the ifptex package.
Revision History
----------------
* Version 2.2 〈2022/04/03〉
- Officialy support `\upTeXguessedversion`.
- Add `\Require(Native)upTeXAtLeast`.
* Version 2.1 〈2021/07/01〉
- Adjust for the future version of pTeX.
- Drop an undocumented feature.
* Version 2.0 〈2019/11/01〉
- Adjust to work better with the new iftex package maintanined
by the LaTeX3 Project.
- Now iftex is loaded inside ifptex.
- Provide always all-lowercase `\if...tex` commands.
- Support for loading in INI mode.
* Version 1.2c 〈2017/10/04〉
* Version 1.2b 〈2017/09/20〉
* Version 1.2a 〈2017/09/15〉
* Version 1.2 〈2017/09/09〉
- Add `\ifstrictupTeX` and `RequireStrictupTeX`.
* Version 1.1 〈2017/05/04〉
- Minor fix.
* Version 1.0 〈2013/04/29〉
- Move to a separate bundle.
- Change the package name to ifptex, and added the test
for pTeX (besides upTeX).
* Version 0.2 〈2008/03/14〉
- First public version.
--------------------
Takayuki YATO (aka. "ZR")
https://github.com/zr-tex8r
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