package org.apache.maven.plugin.doap;

 import java.util.ArrayList;

 import java.util.Iterator;

 import java.util.List;

 import org.apache.maven.plugin.AbstractMojo;

 import org.apache.maven.plugin.MojoExecutionException;

 /**

  * Display help information on maven-doap-plugin. Call <pre>  mvn doap:help -Ddetail=true -Dgoal=&lt;goal-name&gt;</pre> to display parameter details.

  *

  * @version generated on Mon Jul 28 18:57:39 EDT 2008

  * @goal help

  * @requiresProject false

  */

 public class HelpMojo

     extends AbstractMojo

 {

     /**

      * If <code>true</code>, display all settable properties for each goal.

      * 

      * @parameter expression="${detail}" default-value="false"

      */

     private boolean detail;

     /**

      * The name of the goal for which to show help. If unspecified, all goals will be displayed.

      * 

      * @parameter expression="${goal}"

      */

     private java.lang.String goal;

     /**

      * The maximum length of a display line.

      * 

      * @parameter expression="${lineLength}" default-value="80"

      */

     private int lineLength;

     /**

      * The number of spaces per indentation level.

      * 

      * @parameter expression="${indentSize}" default-value="2"

      */

     private int indentSize;

     /** {@inheritDoc} */

     public void execute()

         throws MojoExecutionException

     {

         StringBuffer sb = new StringBuffer();

         append( sb, "org.apache.maven.plugins:maven-doap-plugin:1.0", 0 );

         append( sb, "", 0 );

         append( sb, "Maven DOAP Plugin 1.0", 0 );

         append( sb, "Plugins which generate a DOAP file from information in a POM.", 1 );

         append( sb, "", 0 );

         if ( goal == null || goal.length() <= 0 )

         {

             append( sb, "This plugin has 2 goals:", 0 );

             append( sb, "", 0 );

         }

         if ( goal == null || goal.length() <= 0 || "generate".equals( goal ) )

         {

             append( sb, "doap:generate", 0 );

             append( sb, "Generate a Description of a Project (DOAP) file from the main information found in a POM.\nNote: The generated file is tailored for use by projects at Apache.", 1 );

             append( sb, "", 0 );

             if ( detail )

             {

                 append( sb, "Available parameters:", 1 );

                 append( sb, "", 0 );

                 append( sb, "about (Default: ${project.url})", 2 );

                 append( sb, "The about URI-reference which should be displayed in the DOAP file. Example:\n<rdf:RDF>\n\u00a0\u00a0<Project\u00a0rdf:about=\'http://maven.apache.org/\'>\n\u00a0\u00a0...\n\u00a0\u00a0</Project>\n</rdf:RDF>\nSee http://www.w3.org/TR/1999/REC-rdf-syntax-19990222/#aboutAttr\n", 3 );

                 append( sb, "", 0 );

                 append( sb, "asfExtOptions", 2 );

                 append( sb, "Specific ASF extensions parameters, i.e. options that POM doesn\'t have any notions but required by ASF DOAP requirements.\nExample:\n<asfExtOptions>\n\u00a0\u00a0<included>true</included>\n\u00a0\u00a0<charter>The\u00a0mission\u00a0of\u00a0the\u00a0Apache\u00a0XXX\u00a0project\u00a0is\u00a0to\u00a0create\u00a0and\u00a0maintain\u00a0software\n\u00a0\u00a0libraries\u00a0that\u00a0provide\u00a0...</charter>\n\u00a0\u00a0...\n</asfExtOptions>\nNote: By default, asfExtOptions/included is set to true to include the ASF extensions.\nSee Javadoc\n", 3 );

                 append( sb, "", 0 );

                 append( sb, "category", 2 );

                 append( sb, "The category which should be displayed in the DOAP file.", 3 );

                 append( sb, "", 0 );

                 append( sb, "doapFile (Default: ${project.reporting.outputDirectory}/doap_${project.artifactId}.rdf)", 2 );

                 append( sb, "The name of the DOAP file that will be generated.", 3 );

                 append( sb, "", 0 );

                 append( sb, "doapOptions", 2 );

                 append( sb, "Specific DOAP parameters, i.e. options that POM doesn\'t have any notions.\nExample:\n<doapOptions>\n\u00a0\u00a0<programmingLanguage>java</programmingLanguage>\n</doapOptions>\n\nSee Javadoc\n", 3 );

                 append( sb, "", 0 );

                 append( sb, "lang (Default: en)", 2 );

                 append( sb, "The value for the xml:lang attribute used by the <rdf:RDF/>, <description/> and <shortdesc/> elements.\nPOM doesn\'t have any notions about language.\nSee http://www.w3.org/TR/REC-xml/#sec-lang-tag\n", 3 );

                 append( sb, "", 0 );

                 append( sb, "language", 2 );

                 append( sb, "The programming language which should be displayed in the DOAP file.", 3 );

                 append( sb, "", 0 );

                 append( sb, "project", 2 );

                 append( sb, "The POM from which information will be extracted to create a DOAP file.", 3 );

                 append( sb, "", 0 );

             }

         }

         if ( goal == null || goal.length() <= 0 || "help".equals( goal ) )

         {

             append( sb, "doap:help", 0 );

             append( sb, "Display help information on maven-doap-plugin. Call\n\u00a0\u00a0mvn\u00a0doap:help\u00a0-Ddetail=true\u00a0-Dgoal=<goal-name>\nto display parameter details.", 1 );

             append( sb, "", 0 );

             if ( detail )

             {

                 append( sb, "Available parameters:", 1 );

                 append( sb, "", 0 );

                 append( sb, "detail (Default: false)", 2 );

                 append( sb, "If true, display all settable properties for each goal.", 3 );

                 append( sb, "", 0 );

                 append( sb, "goal", 2 );

                 append( sb, "The name of the goal for which to show help. If unspecified, all goals will be displayed.", 3 );

                 append( sb, "", 0 );

                 append( sb, "lineLength (Default: 80)", 2 );

                 append( sb, "The maximum length of a display line.", 3 );

                 append( sb, "", 0 );

                 append( sb, "indentSize (Default: 2)", 2 );

                 append( sb, "The number of spaces per indentation level.", 3 );

                 append( sb, "", 0 );

             }

         }

         if ( getLog().isInfoEnabled() )

         {

             getLog().info( sb.toString() );

         }

     }

     /**

      * <p>Repeat a String <code>n</code> times to form a new string.</p>

      *

      * @param str String to repeat

      * @param repeat number of times to repeat str

      * @return String with repeated String

      * @throws NegativeArraySizeException if <code>repeat < 0</code>

      * @throws NullPointerException if str is <code>null</code>

      */

     private static String repeat( String str, int repeat )

     {

         StringBuffer buffer = new StringBuffer( repeat * str.length() );

         for ( int i = 0; i < repeat; i++ )

         {

             buffer.append( str );

         }

         return buffer.toString();

     }

     private void append( StringBuffer sb, String description, int indent )

     {

         for ( Iterator it = toLines( description, indent ).iterator(); it.hasNext(); )

         {

             sb.append( it.next().toString() ).append( '\n' );

         }

     }

     /** 

      * Splits the specified text into lines of convenient display length.

      * 

      * @param text The text to split into lines, must not be <code>null</code>.

      * @param indent The base indentation level of each line, must not be negative.

      * @return The sequence of display lines, never <code>null</code>.

      */

     private List toLines( String text, int indent )

     {

         List lines = new ArrayList();

         String ind = repeat( "\t", indent );

         String[] plainLines = text.split( "(\r\n)|(\r)|(\n)" );

         for ( int i = 0; i < plainLines.length; i++ )

         {

             toLines( lines, ind + plainLines[i] );

         }

         return lines;

     }

     /** 

      * Adds the specified line to the output sequence, performing line wrapping if necessary.

      * 

      * @param lines The sequence of display lines, must not be <code>null</code>.

      * @param line The line to add, must not be <code>null</code>.

      */

     private void toLines( List lines, String line )

     {

         int lineIndent = getIndentLevel( line );

         StringBuffer buf = new StringBuffer( 256 );

         String[] tokens = line.split( " +" );

         for ( int i = 0; i < tokens.length; i++ )

         {

             String token = tokens[i];

             if ( i > 0 )

             {

                 if ( buf.length() + token.length() >= lineLength )

                 {

                     lines.add( buf.toString() );

                     buf.setLength( 0 );

                     buf.append( repeat( " ", lineIndent * indentSize ) );

                 }

                 else

                 {

                     buf.append( ' ' );

                 }

             }

             for ( int j = 0; j < token.length(); j++ )

             {

                 char c = token.charAt( j );

                 if ( c == '\t' )

                 {

                     buf.append( repeat( " ", indentSize - buf.length() % indentSize ) );

                 }

                 else if ( c == '\u00A0' )

                 {

                     buf.append( ' ' );

                 }

                 else

                 {

                     buf.append( c );

                 }

             }

         }

         lines.add( buf.toString() );

     }

     /** 

      * Gets the indentation level of the specified line.

      * 

      * @param line The line whose indentation level should be retrieved, must not be <code>null</code>.

      * @return The indentation level of the line.

      */

     private static int getIndentLevel( String line )

     {

         int level = 0;

         for ( int i = 0; i < line.length() && line.charAt( i ) == '\t'; i++ )

         {

             level++;

         }

         for ( int i = level + 1; i <= level + 4 && i < line.length(); i++ )

         {

             if ( line.charAt( i ) == '\t' )

             {

                 level++;

                 break;

             }

         }

         return level;

     }

 }