package org.apache.maven.plugins.enforcer;

 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-enforcer-plugin.<br/> Call <pre>  mvn enforcer:help -Ddetail=true -Dgoal=&lt;goal-name&gt;</pre> to display parameter details.

  *

  * @version generated on Wed Jun 15 16:59:46 CEST 2011

  * @author org.apache.maven.tools.plugin.generator.PluginHelpGenerator (version 2.7)

  * @goal help

  * @requiresProject false

  * @threadSafe

  */

 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, should be positive.

      * 

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

      */

     private int lineLength;

     /**

      * The number of spaces per indentation level, should be positive.

      * 

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

      */

     private int indentSize;

     /** {@inheritDoc} */

     public void execute()

         throws MojoExecutionException

     {

         if ( lineLength <= 0 )

         {

             getLog().warn( "The parameter 'lineLength' should be positive, using '80' as default." );

             lineLength = 80;

         }

         if ( indentSize <= 0 )

         {

             getLog().warn( "The parameter 'indentSize' should be positive, using '2' as default." );

             indentSize = 2;

         }

         StringBuffer sb = new StringBuffer();

         append( sb, "org.apache.maven.plugins:maven-enforcer-plugin:1.0.1", 0 );

         append( sb, "", 0 );

         append( sb, "Maven Enforcer Plugin", 0 );

         append( sb, "The Loving Iron Fist of Maven", 1 );

         append( sb, "", 0 );

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

         {

             append( sb, "This plugin has 4 goals:", 0 );

             append( sb, "", 0 );

         }

         if ( goal == null || goal.length() <= 0 || "display-info".equals( goal ) )

         {

             append( sb, "enforcer:display-info", 0 );

             append( sb, "This goal displays the current platform information.", 1 );

             append( sb, "", 0 );

             if ( detail )

             {

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

                 append( sb, "", 0 );

             }

         }

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

         {

             append( sb, "enforcer:enforce", 0 );

             append( sb, "This goal executes the defined enforcer-rules once per module.", 1 );

             append( sb, "", 0 );

             if ( detail )

             {

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

                 append( sb, "", 0 );

                 append( sb, "fail (Default: true)", 2 );

                 append( sb, "Flag to fail the build if a version check fails.", 3 );

                 append( sb, "Expression: ${enforcer.fail}", 3 );

                 append( sb, "", 0 );

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

                 append( sb, "Fail on the first rule that doesn\'t pass", 3 );

                 append( sb, "Expression: ${enforcer.failFast}", 3 );

                 append( sb, "", 0 );

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

                 append( sb, "Use this flag to disable rule result caching. This will cause all rules to execute on each project even if the rule indicates it can safely be cached.", 3 );

                 append( sb, "Expression: ${enforcer.ignoreCache}", 3 );

                 append( sb, "", 0 );

                 append( sb, "rules", 2 );

                 append( sb, "Array of objects that implement the EnforcerRule interface to execute.", 3 );

                 append( sb, "Required: Yes", 3 );

                 append( sb, "", 0 );

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

                 append( sb, "Flag to easily skip all checks", 3 );

                 append( sb, "Expression: ${enforcer.skip}", 3 );

                 append( sb, "", 0 );

             }

         }

         if ( goal == null || goal.length() <= 0 || "enforce-once".equals( goal ) )

         {

             append( sb, "enforcer:enforce-once", 0 );

             append( sb, "This goal has been deprecated.", 1 );

             append( sb, "", 0 );

             if ( detail )

             {

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

                 append( sb, "", 0 );

                 append( sb, "fail (Default: true)", 2 );

                 append( sb, "Flag to fail the build if a version check fails.", 3 );

                 append( sb, "Expression: ${enforcer.fail}", 3 );

                 append( sb, "", 0 );

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

                 append( sb, "Fail on the first rule that doesn\'t pass", 3 );

                 append( sb, "Expression: ${enforcer.failFast}", 3 );

                 append( sb, "", 0 );

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

                 append( sb, "Use this flag to disable rule result caching. This will cause all rules to execute on each project even if the rule indicates it can safely be cached.", 3 );

                 append( sb, "Expression: ${enforcer.ignoreCache}", 3 );

                 append( sb, "", 0 );

                 append( sb, "rules", 2 );

                 append( sb, "Array of objects that implement the EnforcerRule interface to execute.", 3 );

                 append( sb, "Required: Yes", 3 );

                 append( sb, "", 0 );

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

                 append( sb, "Flag to easily skip all checks", 3 );

                 append( sb, "Expression: ${enforcer.skip}", 3 );

                 append( sb, "", 0 );

             }

         }

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

         {

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

             append( sb, "Display help information on maven-enforcer-plugin.\nCall\n\u00a0\u00a0mvn\u00a0enforcer: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, "Expression: ${detail}", 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, "Expression: ${goal}", 3 );

                 append( sb, "", 0 );

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

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

                 append( sb, "Expression: ${indentSize}", 3 );

                 append( sb, "", 0 );

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

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

                 append( sb, "Expression: ${lineLength}", 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();

     }

     /** 

      * Append a description to the buffer by respecting the indentSize and lineLength parameters.

      * <b>Note</b>: The last character is always a new line.

      * 

      * @param sb The buffer to append the description, not <code>null</code>.

      * @param description The description, not <code>null</code>.

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

      */

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

     {

         for ( Iterator it = toLines( description, indent, indentSize, lineLength ).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.

      * @param indentSize The size of each indentation, must not be negative.

      * @param lineLength The length of the line, must not be negative.

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

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

      */

     private static List toLines( String text, int indent, int indentSize, int lineLength )

     {

         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], indentSize, lineLength );

         }

         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>.

      * @param indentSize The size of each indentation, must not be negative.

      * @param lineLength The length of the line, must not be negative.

      */

     private static void toLines( List lines, String line, int indentSize, int lineLength )

     {

         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;

     }

 }