Provided by: gladtex_3.1.0-2_all 
NAME
GladTeX - generate HTML with LaTeX formulas embedded as images
SYNOPSIS
gladtex OPTIONS
DESCRIPTION
GladTeX is a formula preprocessor for HTML files. It recognizes a special tag (<eq>...</eq>) marking
formulas for conversion. The converted vector images are integrated into the output HTML document. This
eases the process of creating HTML documents (or web sites) containing formulas.
The generated images are saved in a cache to not render the same image over and over again. This speeds
up the process when formulas occur multiple times or when a document is extended gradually.
The LaTeX formulas are preserved in the alt attribute of the embedded images, hence screen reader users
benefit from an accessible HTML version of the document.
Furthermore it can be used with Pandoc to convert Markdown documents and other formats with LaTeX formu‐
las to HTML, EPUB and in fact to any HTML-based format, see the option -P.
See FILE FORMAT for an explanation of the file format and EXAMPLES for examples on how to use GladTeX on
its own or with Pandoc.
OPTIONS
INPUT FILE NAME
Input .htex file with LaTeX formulas (if omitted or -, stdin will be read).
-h –help
Show this help message and exit.
-a Save text alternatives for images which are too long for the alt attribute into a single separate
file and link images to it.
-b BACKGROUND_COLOR
Set background color for resulting images (default transparent). GladTeX understands colors as
provided by the dvips option of the xcolor LaTeX package. Alternatively, a 6-digit hexadecimal
value can be provided (as used e.g. in HTML/CSS).
-c FOREGROUND_COLOR
Set foreground color for resulting images. See the option above for a more in-depth explanation.
-d DIRECTORY
Directory in which to store the generated images in (relative path).
The given path is interpreted relatively to the input file. For instance,:
gladtex -d img dir/file.htex
will create a dir/img directory and link accordingly in x/file.htex.
-e LATEX_MATHS_ENV
Set custom maths environment to surround the formula (e.g. flalign).
-E ENCODING
Overwrite encoding to use (default UTF-8).
-f FONTSIZE
Overwrite the default font size of 12pt. 12pt is the default in most browsers and hence changing
this might lead to less-portable documents.
-i CLASS
CSS class to assign to inline math (default: `inlinemath').
-K keep LaTeX file(s) when converting formulas
By default, the generated LaTeX document, containing the formula to be converted, are removed af‐
ter the conversion (no matter whether it was successful or not). If it wasn’t successful, it is
sometimes helpful to look at the complete document. This option will keep the file.
-l CLASS
CSS class to assign to block-level math (default: `displaymath').
-n Purge unreadable caches along with all eqn*.png files.
Caches can be unreadable if the used GladTeX version is incompatible. If this option is unset,
GladTeX will simply fail when the cache is unreadable.
-m Print error output in machine-readable format (less concise, better parseable).
Each line will start with a key, followed by a colon, followed by the value, i.e. line: 5.
-o FILENAME
Set output file name. `-' will print text to stdout. Bydefault, input file name is used and the
.htex extension is replaced by .html.
-p LATEX_STATEMENT
Add given LaTeX code to preamble of document. That’ll affect the conversion of every image.
-P Act as a pandoc filter. In this mode, input is expected to be a Pandoc JSON AST and the output
will be a modified AST, with all formulas replaced through HTML image tags. It makes sense to use
- as the input file for this option.
–png Switch from SVG to PNG as image output. This image has several known issues, one of them being
that images won’t resize when zooming into the document. It is also harder to work with for visu‐
ally impaired users.
-r DPI Set resolution (size of images) to `dpi' (115 by default). This is only available with the --png
option. Also see the -f option.
-R Replace non-ascii (unicode) characters by LaTeX commands.
GladTeX can automatically detect non-ascii characters in formulas and replace them through their
appropriate LaTeX commands. In the alt attribute of the resulting image, alphabetical characters
won’t be replaced. That means that the alt text from the image is not exactly the same than the
code used for generating the image, but it is far more readable.
For instance, the formula $\text{für alle} a$, would be compiled as $\text{f\ddot{u}r alle} a$ and
displayed as “\text{für alle} a” in the alt attribute.
-u URL Base URL to image files (relative links are default).
FILE FORMAT
A .htex file is essentially a HTML file containing LaTeX formulas. The formulas have to be surrounded by
<eq> and </eq>.
By default, formulas are rendered as inline maths, so they are squeezed to the height of the line. It is
possible to render a formula as display maths by setting the env attribute to displaymath, i.e. <eq
env="displaymath">...</eq>.
ENVIRONMENT VARIABLES
GladTeX can be customised by environment variables:
DEBUG If this is set to 1, a full Python traceback, instead of a human-readable error message, will be
displayed. GLADTEX_ARGS: When this environment variable is set, GladTeX switches into pandoc fil‐
ter mode: input is read from standard input, output written to standard output and the -P switch
is assumed. The contents of this variable parsed as command-line switches. See an example in
Output As EPUB#output-asepub).
EXAMPLES
Sample HTEX document
A sample HTEX document could look like this:
<html><head><!-- meta information like charset --></head>
<body>
<h1>Some text</h1>
<p>Circumference of a circle: <eq>u = \pi\cdot d</eq><p>
<p>A useful matrix: <eq env="displaymath">\begin{pmatrix}
1 &2 &3 &4\\
5 &6 &7 &8\\
9 &10&11&12
\end{pmatrix}</eq></p>
</body></html>
This can be converted using
gladtex file.htex
and the result will be a HTML document called file.html along with two files eqn0000.png and eqn0001.png
in the same directory.
Markdown To HTML
GladTeX can be used together with Pandoc. That can be handy to create an online version of a scientific
paper written in Markdown. The MarkDown document would look like this:
Some text
=========
Circumference of a circle: $u = \pi\cdot d$
A useful matrix: $$\begin{pmatrix}
1 &2 &3 &4\\
5 &6 &7 &8\\
9 &10&11&12 \end{pmatrix}$$
The conversion is as easy as typing on the command-line:
pandoc -s -t html --gladtex file.md | gladtex -o file.html -
Output as EPUB
It is beyond of the scope of this document to introduce Pandoc, but with any input format, converting to
EPUB with GladTeX replacing the images is as easy as:
pandoc -t json FILE.ext | gladtex -d img -P - | pandoc -f json -o book.epub
Capitalised parameters should be replaced. This can be used with Markdown as input format, see previous
section.
If you want to call Pandoc as a filter without the pipes, you can use the environment variable GLAD‐
TEX_ARGS:
GLADTEX_ARGS='-d img' pandoc -o BOOK.EPUB -F gladtex FILE.ext
KNOWN LIMITATIONS
LaTeX2E is not unicode aware. if you have any unicode (more precisely, non-ascii characters) signs in
your documents, you have the choice to do one of the following:
1. Look up the symbol in one of the many LaTeX formula listings and replace the symbol with the appropri‐
ate command.
2. Use the -r switch to let GladTeX replace the umlauts for you.
PLEASE NOTE: It is impossible to use GladTeX with LuaLaTeX. At the time of writing, dvipng does not sup‐
port the extended font features of the lualatex engine.
PROJECT HOME
The project home is at <http://humenda.github.io/GladTeX>. The source can be found at
<https://github.com/humenda/gladtex>.
AUTHORS
Sebastian Humenda.
8th of September 2018 GLADTEX(1)