// UpdateIndex
// V1.0 creates table of contents/index at top of outline file
// Peter@TurtleCoveTech.com
//
// Assumes the file is organized as non-indented headers with indented contents
// Finds all header lines and replaces the section titled "Index" with a list of all the headers

import java.util.regex.Pattern;
import java.util.regex.Matcher;

// Gather headers
String body=textArea.getText();
StringBuffer indexSection=new StringBuffer("Index\n");
Matcher titleMatcher=Pattern.compile("^[^ \t\n].*$", Pattern.MULTILINE).matcher(body);
while(titleMatcher.find()) {
	title=titleMatcher.group();
	if (!title.equals("Index")) {
		indexSection.append("\t").append(title).append("\n");
	}
}
indexSection.append("\n");

// replace index section
// SearchAndReplace didn't work. Multiline problem?
// use getText, replace, setText

Matcher bodyMatcher= Pattern.compile("^[Ii]ndex\n(^[ \t]+[^\\n]+$\n)+\n", Pattern.MULTILINE) .matcher(body);
textArea.setText( bodyMatcher.replaceFirst( indexSection.toString()));

// setText leaves cursor at end. Better to leave cursor on our new Index

Matcher newindexMatcher= Pattern. compile("^Index$",Pattern.MULTILINE) .matcher(textArea.getText());
if (newindexMatcher.find()) {
	textArea.setCaretPosition( newindexMatcher.start());
}