JDevhelp

This program makes javadocs browsable from Devhelp.

Copyright 2013 Eric Le Lay wanadoo.fr:neric27
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Dependencies

Java 1.6 or later (JDK is not required).
The open source SAXON XSLT processor developed by Saxonica Limited (the home edition is sufficient).
The HTML as XML TagSoup parser developed by John Cowan.

Installation

get this directory
download Saxon HE 9 from Saxon homepage or maven repository
Save it in this directory as saxon9he.jar
download TagSoup from TagSoup homepage
Save it in this directory as tagsoup-1.2.1.jar

Browsing local javadoc

To browse the API of a program you built yourself, use the jdevhelp-link.sh script.

jdevhelp-link.sh build/doc/api MySuperProgram

will make the javadoc in build/doc/api browsable in Devhelp as MySuperProgram.

The content will not be copied over to the Devhelp books directory so keep it in place

You'll have to restart Devhelp to access the new book.

Indexing the Java Platform API

Download the javadoc from Oracle
Extract to Whatever directory
Run jdevhelp-link.sh Whatever/api JavaPlatform

Browsing javadoc of a dependency

Download the javadoc artifact from maven repository. These are jar files ending with "-javadoc.jar"

Use the jdevhelp-jar.sh script:

jdevhelp-jar.sh ~/Downloads/my-dependency-x.y.z-javadoc.jar

You'll have to restart Devhelp to access the new book.

How it works

Devhelp books are installed in $HOME/.local/share/devhelp/books

They consist in a directory with html content and a xxx.devhelp2 XML file containing the table of contents and index.

Javadocs always have an allclasses-noframe.html file listing all classes in the javadoc. This file is parsed by JDevhelp and transformed into a devhelp2 table of contents.

jdevhelp-link.sh will first create a link from the directory containing the javadocs to the books directory.

jdevhelp-jar.sh will first extract the content of the javadocs artifacts in the books directory.

Alternatives / future work

A Devhelp doclet

Devhelp integration is currently decoupled from the build process.

jdevhelp-link could be run from an Ant task.

A better way would be to generate the devhelp2 file using a doclet (see The javadoc ant task). See for instance the jEdit doclet.

Then jdevhelp-link would be invoked only once to setup the link (or ln -s run manually) and the book will be in sync with the javadocs upon each successive ant build.

Select and install from Devhelp itself

This is not the way of installing books in Devhelp currently, but a GUI to browse for and install javadocs directly from Devhelp preferences would be cool.

Maven integration

One should be able to get javadocs for all dependencies using this snippet (untested):

 <project>
   [...]
   <build>
     <plugins>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-dependency-plugin</artifactId>
         <version>2.8</version>
         <executions>
           <execution>
             <id>javadoc-dependencies</id>
             <phase>package</phase>
             <goals>
               <goal>unpack-dependencies</goal>
             </goals>
             <configuration>
               <classifier>javadoc</classifier>
               <failOnMissingClassifierArtifact>false</failOnMissingClassifierArtifact>
               <outputDirectory>${project.build.directory}/apidocs</outputDirectory>
             </configuration>
           </execution>
         </executions>
       </plugin>
     </plugins>
   </build>
   [...]
 </project>

Source: Maven Dependency Plugin

Then (untested) for i in build/apidocs/*; do j=basename $i echo installing $j jdevhelp-link.sh $i $j done

Tagging methods, fields and constructors

Variations in the transform are possible. I have tried to index methods and constructors but I didn't find the search function satisfactory: if I index methods and constructors, I can't find the String class by typing String anymore.

To enable indexing of methods and constructors, uncomment relevant parts of transform.xsl.

elelay/JDevhelp