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# `pp(1)`
a preprocessor
`pp(1)` allows embedding
[`sh(1)`](https://pubs.opengroup.org/onlinepubs/9699919799/utilities/sh.html)
code in files of any type by nesting it inside the `#!\n` token, where
`\n` is a new line. That means that if you'd like a simple loop or an
`if` inside an HTML file for instance,
you could use `pp(1)`.
## Basic usage
For the following code:
<!doctype html>
<title>pp(1) example</title>
<ul>
#!
i=1
while test $i -le 10
do
if test $((i % 2)) -eq 0
then
#!
<li class=even>$i</li>
#!
else
#!
<li class=odd>$i</li>
#!
fi
i=$((i + 1))
done
#!
</ul>
`pp(1)` outputs:
<!doctype html>
<title>pp(1) example</title>
<ul>
<li class=odd>1</li>
<li class=even>2</li>
<li class=odd>3</li>
<li class=even>4</li>
<li class=odd>5</li>
<li class=even>6</li>
<li class=odd>7</li>
<li class=even>8</li>
<li class=odd>9</li>
<li class=even>10</li>
</ul>
## Arguments
You can also pass arguments to it by appending them to the command call:
<!doctype html>
<title>$1</title>
<p>
#!
echo $2
#!
</p>
Calling the above code with
`pp tmp.upphtml 'pp(1) example' 'hello, world'`
will result in:
<!doctype html>
<title>pp(1) example</title>
<p>
hello world
</p>
## Pipes
`pp(1)`'s `stdin` is sent to the child
[`sh(1)`](https://pubs.opengroup.org/onlinepubs/9699919799/utilities/sh.html)
<!doctype html>
<title>pp(1) example</title>
<p>
#!
cat
#!
</p>
`echo 'hello, world' | pp tmp.upphtml` will output:
<!doctype html>
<title>pp(1) example</title>
<p>
hello, world
</p>
## Debugging
`pp(1)` also takes an optional `-d` flag. If passed, `pp(1)` will dump
the generated
[`sh(1)`](https://pubs.opengroup.org/onlinepubs/9699919799/utilities/sh.html)
code instead of executing it:
<!doctype html>
<title>pp(1) example</title>
<ul>
#!
i=1
while test $i -le 10
do
if test $((i % 2)) -eq 0
then
#!
<li class=even>$i</li>
#!
else
#!
<li class=odd>$i</li>
#!
fi
i=$((i + 1))
done
#!
</ul>
`pp -d tmp.upphtml` will output:
echo "<!doctype html>
<title>pp(1) example</title>
<ul>"
i=1
while test $i -le 10
do
if test $((i % 2)) -eq 0
then
echo " <li class=even>$i</li>"
else
echo " <li class=odd>$i</li>"
fi
i=$((i + 1))
done
echo "</ul>"
## Example
<!doctype html>
<html lang=en>
<title>pp(1)</title>
<meta charset=UTF-8>
<meta name=viewport content='width=device-width'>
<link rel=stylesheet href=../theme.css>
<body>
<a href=../#myprojects>Home</a>
#!
addcls() {
sed "s/<code>/<code class=language-bash>/g"
}
smu README | addcls
#!
<h2>Files</h2>
<ul>
#!
for f in *
do
case $f in
*.upp*|*.html|*.tgz)
continue
;;
esac
#!
<li><a href=$f>$f</a></li>
#!
done
#!
</ul>
<h2>Download</h2>
<a href=pp.tgz>pp.tgz</a>
<script src=../prism.js data-manual></script>
<script src=../enhance.js></script>
</body>
</html>
## See also
* <https://github.com/radare/spp>
* <https://werc.cat-v.org/docs/rc-template-lang>
* <https://code.9front.org/hg/werc/file/92f7463dac1a/bin/template.awk>
|
