OpenJDK Web Page Generator
The Makefile in this repository generates HTML files and other assets
for a subtree of the openjdk.java.net web site.
The easiest way to preview a local documentation repository is to clone
this repository into your local repository and then create a trivial
Makefile in that repository:
$ echo 'include ojweb-generate/Makefile' >Makefile
Then running make in your repository will format the source files into
the ./build directory, or to $BUILD if the BUILD environment
variable is set.
This repository includes a tiny web server which you can use to preview the generated files locally:
$ make preview
Then point your browser at http://localhost:8081/.
Additional make targets include:
make update— updates the localojweb-generaterepositorymake clean— removes the buildmake help— summarizes themaketargets
Tools required
You’ll need GNU Make, Git, Tidy, xsltproc, and Pandoc (version 2.5 or later), plus the usual core utilities.
To install these on a Debian-based system:
$ apt-get install make git tidy xsltproc pandoc
To install these on macOS using Homebrew:
$ brew install coreutils gnu-sed make git tidy-html5 pandoc
$ export PATH="/usr/local/opt/coreutils/libexec/gnubin:$PATH"
$ export PATH="/usr/local/opt/gnu-sed/libexec/gnubin:$PATH"
$ export PATH="/usr/local/opt/make/libexec/gnubin:$PATH"
Source format
We use Pandoc to generate HTML from Markdown (.md) source files in
Pandoc’s extended version of Markdown which includes,
among other things, support for header attributes, several
types of tables, and mathematics.
Title and metadata
For the consistent appearance of all pages, the first lines of a Markdown source file should be of the form
# Off the Shoulders of Orion
## I’ve Seen Things You Wouldn’t Believe {.subtitle}
#### Roy Batty {.author}
#### January 2019 {.date}
The header attributes {.subtitle}, {.author}, and {.date} identify
the corresponding headers as containing metadata. The subtitle is
optional. Blank lines between these elements are ignored.
Table of contents
To include a simple, two-level table of contents in your document, place this line where you’d like the table to appear:
<div class="table-of-contents"/>
To place a heading before the table, use an h4 heading:
#### Contents
<div class="table-of-contents"/>
(We should use a nav element here, but Tidy mistakenly treats navs as
inline elements and so wraps them in p elements, which is not helpful,
so we use a div instead.)
To omit a section and all of its subsections from the table of contents,
annotate the section’s header with {toc=omit}. To omit all of the
subsections of a section but not the section itself, annotate the
section’s header with {toc=omit-children}. For example:
## Style Guidelines for Text Blocks {toc=omit-children}
Mathematics
MathJax is enabled for mathematical expressions using TeX and LaTeX
notation. Enclose inline mathematics in \( ... \), and enclose
displayed equations in \[ ... \]:
When \(a \ne 0\) there are two solutions to \(ax^2+bx+c=0\),
which are \[x = {-b \pm\sqrt{b^2-4ac} \over 2a}.\]
The MathJax JavaScript display engine is loaded only when needed.
Optional head content
If a Markdown document foo.md requires a custom CSS stylesheet, or some
JavaScript code, then place that content in a sibling foo.head file,
wrapped in a head element:
<head>
<style>
CODE { color: red; }
</style>
<script>
document.addEventListener("DOMContentLoaded",
(event) => alert("Hi!"));
</script>
</head>
The children of the head element in this file will be copied to the end
of the head element in the generated HTML.
Please avoid using optional head content unless absolutely
necessary. CSS rules introduced in this way can interfere with the
default stylesheet and JavaScript, of course, comes with its own set of
risks.
You can customize the formatting process even further by creating a
Local.gmk file; please see the Makefile for guidance.
Additional source forms
A file named _index.md will produce the index file for the directory
that contains it.
Files ending in .html are copied verbatim to the output directory,
dropping the .html suffix.
Files ending in .jpg, .png, or .svg are copied verbatim to the
output directory, preserving their suffixes.
Output format
Each Markdown or HTML source file, foo/bar.md or foo/bar.html,
produces an output file foo/bar, without the suffix.
The output will contain a subtree map in the _map file, from which you
can visit all the pages in the subtree.
The footer of each generated HTML page contains the usual legal notices, a timestamp, and the hash of the most recent commit of the source file for that page. The hash is a link to the history of the source file in the originating repository.