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-LaTeX Filter
-============
-
-:blogpost-status: published
-:blogpost-doctype: article
-:blogpost-posttype: page
-:blogpost-categories: AsciiDoc,LaTeX,python
-
-The AsciiDoc distribution includes a LaTeX filter that translates
-LaTeX source to PNG image which is automatically inserted into the
-AsciiDoc output document. Although it can accept any LaTeX source, the
-primary use is to render mathematical formulae (see the examples
-below).  The filter implements the 'latex' Listing block and Paragraph
-styles.
-
-This LaTeX paragraph:
-
-[listing]
-.....................................................................
-[latex]
-$y = \int_0^\infty \gamma^2 \cos(x) dx$
-.....................................................................
-
-Renders:
-
-[latex]
-$y = \int_0^\infty \gamma^2 \cos(x) dx$
-
-This LaTeX block:
-
-[listing]
-.....................................................................
-["latex","latex1.png",align="center"]
----------------------------------------------------------------------
-$\displaystyle{ V_i = C_0 - C_3
-\frac{C_1\cos(\theta_i+C_3)}{C_4+C_1\cos(\theta_i+C_2)} }$
----------------------------------------------------------------------
-.....................................................................
-
-Renders:
-
-["latex","latex1.png",align="center"]
----------------------------------------------------------------------
-$\displaystyle{ V_i = C_0 - C_3
-\frac{C_1\cos(\theta_i+C_3)}{C_4+C_1\cos(\theta_i+C_2)} }$
----------------------------------------------------------------------
-
-This LaTeX block:
-
-[listing]
-.....................................................................
-.LaTeX filter example
-[latex]
-["latex","latex3.png"]
----------------------------------------------------------------------
-\begin{equation}
-\Re{z} =\frac{n\pi \dfrac{\theta +\psi}{2}}{
-\left(\dfrac{\theta +\psi}{2}\right)^2 + \left( \dfrac{1}{2}
-\log \left\lvert\dfrac{B}{A}\right\rvert\right)^2}.
-\end{equation}
-
-\begin{equation}
-\boxed{\eta \leq C(\delta(\eta) +\Lambda_M(0,\delta))}
-\end{equation}
-
-\begin{equation}\label{first}
-a=b+c
-\end{equation}
-
-\begin{subequations}\label{grp}
-\begin{align}
-a&=b+c\label{second}\\
-d&=e+f+g\label{third}\\
-h&=i+j\label{fourth}
-\end{align}
-\end{subequations}
----------------------------------------------------------------------
-.....................................................................
-
-Renders:
-
-.LaTeX filter example
-[latex]
----------------------------------------------------------------------
-\begin{equation}
-\Re{z} =\frac{n\pi \dfrac{\theta +\psi}{2}}{
-\left(\dfrac{\theta +\psi}{2}\right)^2 + \left( \dfrac{1}{2}
-\log \left\lvert\dfrac{B}{A}\right\rvert\right)^2}.
-\end{equation}
-
-\begin{equation}
-\boxed{\eta \leq C(\delta(\eta) +\Lambda_M(0,\delta))}
-\end{equation}
-
-\begin{equation}\label{first}
-a=b+c
-\end{equation}
-
-\begin{subequations}\label{grp}
-\begin{align}
-a&=b+c\label{second}\\
-d&=e+f+g\label{third}\\
-h&=i+j\label{fourth}
-\end{align}
-\end{subequations}
----------------------------------------------------------------------
-
-This LaTeX paragraph:
-
-[listing]
-.....................................................................
-.A LaTeX table
-[latex]
-\begin{tabular}{c r @{.} l}
-Pi expression &
-\multicolumn{2}{c}{Value} \\
-\hline
-$\pi$ & 3&1416 \\
-$\pi^{\pi}$ & 36&46 \\
-$(\pi^{\pi})^{\pi}$ & 80662&7 \\
-\end{tabular}
-.....................................................................
-
-Renders:
-
-.A LaTeX table
-[latex]
-\begin{tabular}{c r @{.} l}
-Pi expression &
-\multicolumn{2}{c}{Value} \\
-\hline
-$\pi$ & 3&1416 \\
-$\pi^{\pi}$ & 36&46 \\
-$(\pi^{\pi})^{\pi}$ & 80662&7 \\
-\end{tabular}
-
-
-Using the Filter
-----------------
-- The LaTeX filter is invoked by setting the Listing block or
-  Paragraph style (the first positional block attribute) to 'latex'.
-- The second positional attribute (named 'target' is optional, it sets
-  the name of the generated PNG image file. If this is not supplied a
-  file name like `{docname}__{target-number}.png` is synthesised
-  (where `{docname}` is the document file name and `{target-number}`
-  is an integer number.
-- The third positional attribute, named 'dpi', is also optional; it is
-  an integer number that sets the output resolution in dots per inch.
-
-Because the LaTeX images are rendered using the image block templates
-you can also use the optional named image block attributes (see
-link:userguide.html#X55[Image macro attributes] in the AsciiDoc User
-Guide).
-
-[TIP]
-=====================================================================
-You can also change the image size using the following LaTeX commands:
-
-  \tiny
-  \scriptsize
-  \footnotesize
-  \small
-  \normalsize
-  \large
-  \Large
-  \LARGE
-  \huge
-
-For example:
-
-  [latex]
-  \Large $y = \int_0^\infty \gamma^2 \cos(x) dx$
-
-The `\Large` command is outside the `$` math delimiters.
-
-=====================================================================
-
-The filter (`./filters/latex/latex2png.py`) can be used outside
-AsciiDoc to convert LaTeX source to PNG images.
-
-Execute the following command to see how to use it:
-
-  $ ./filters/latex/latex2png.py --help
-
-
-Limitations
------------
-- The `asciidoc(1)` input and output files cannot both be `-` (stdin
-  and stdout), either the input or output files (or both) must be a
-  named file.
-
-
-Installation
-------------
-In addition to AsciiDoc you will need to have `latex(1)` and
-`dvipng(1)` installed.