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package org.openoffice.tools.options;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Collection;
public class HelpFormatter {
private static final int TAB_SPACES = 4;
private static final int COMMAND_SEP_SPACES = 2;
public static void printHelp( String pProgram, Command pCommandLine ) {
printHelp( System.out, 80, pProgram, pCommandLine );
}
public static void printHelp( PrintStream pOut, int pMaxLength, String pProgram, Command pCommandLine ) {
org.apache.commons.cli.HelpFormatter formatter = new org.apache.commons.cli.HelpFormatter();
formatter.setSyntaxPrefix( getFilledString( ' ', TAB_SPACES ) );
PrintWriter pw = new PrintWriter( pOut );
// Output the global usage
pOut.println( "\nUsage:" );
for ( SubCommand command : pCommandLine.getCommands() ) {
String app = pProgram + " " + command.getName();
formatter.printUsage( pw, pMaxLength, app, command.getOptions() );
}
pw.flush();
// Output the commands list
pOut.println( "\nSub-commands:" );
printSubCommands( pOut, pMaxLength, pCommandLine.getCommands() );
// Output the common options
pOut.println( "\nCommon options:" );
formatter.printOptions( pw, pMaxLength, pCommandLine.getCommonOptions(), TAB_SPACES, COMMAND_SEP_SPACES );
pw.flush();
// Output the commands options
pOut.println( "\nSub-commands options:" );
for ( SubCommand command : pCommandLine.getCommands() ) {
int nbOptions = command.getOptions().getOptions().size();
if ( nbOptions > 0 ) {
pOut.println( getFilledString( ' ', TAB_SPACES ) + command.getName() );
formatter.printOptions( pw, pMaxLength, command.getOptions(), TAB_SPACES * 2, COMMAND_SEP_SPACES );
pw.flush();
}
}
}
private static void printSubCommands( PrintStream pOut, int pMaxLength, Collection<SubCommand> pCommands ) {
int maxCmdLength = 0;
for ( SubCommand command : pCommands ) {
if ( command.getName().length() > maxCmdLength ) {
maxCmdLength = command.getName().length();
}
}
for ( SubCommand command : pCommands ) {
String name = command.getName();
String message = getFilledString( ' ', TAB_SPACES ) + name;
int nameDiff = ( maxCmdLength - name.length() );
message += getFilledString( ' ', nameDiff + COMMAND_SEP_SPACES );
int restLen = pMaxLength - maxCmdLength - TAB_SPACES - COMMAND_SEP_SPACES;
String aligningBlanks = getFilledString( ' ', pMaxLength - restLen );
String[] words = command.getDescription().split( " " );
int i = 0;
boolean firstLine = true;
String line = new String();
while ( i < words.length ) {
String word = words[i];
if ( line.length() + 1 + word.length() < restLen ) {
if ( line.length() > 0 ) {
line += " ";
}
line += word;
if ( i == words.length - 1 ) {
if ( !firstLine ) {
message += aligningBlanks;
}
message += line + "\n";
}
} else {
if ( !firstLine ) {
message += aligningBlanks;
}
message += line + "\n";
line = word;
firstLine = false;
}
i++;
}
pOut.print( message );
}
}
private static String getFilledString(char pChar, int pNumber) {
char[] chars = new char[pNumber];
Arrays.fill( chars, pChar );
return new String( chars );
}
}
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