/*
 * Search_Ruby_documentation.bsh v0.2
 *
 * Copyright 2004 Robert McKinnon
 *
 * 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 2
 * of the License, or any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
 
/*
 * Allows user to search Ruby documentation using ri - Ruby interactive reference. 
 *  - Brings up dialog for user to enter search term.
 *  - Macro runs ri on term, and reports ri results in another dialog.
 *  - Remembers last term searched, and places it in search entry field.
 *  - If user has text selected, then that is placed in search entry field instead.
 */

import java.util.Timer;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;

/**
 * Runs supplied system command and returns process object.
 */
run(command) {
    Process process = Runtime.getRuntime().exec(command);
    
    java.util.Timer timer = new java.util.Timer();
    TimerTask task = new TimerTask() {
        public void run() {
            synchronized(process) {
                // kills blocked subprocess
                process.destroy();
            }
        }

    };
    timer.schedule(task, 1500);
    
    process.waitFor();
    
    synchronized(process) {
        task.cancel();
    }
 
    return process;
}

/**
 * Returns string output of execution of the supplied system command.
 */
getOutput(command) throws IOException, InterruptedException {
    process = run(command);
    reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
    buffer = new StringBuffer();

    if(reader.ready()) {
        buffer.append(reader.readLine());
        while(reader.ready()) {
            buffer.append('\n' + reader.readLine());
        }
    }
    reader.close();
    
    reader = new BufferedReader(new InputStreamReader(process.getErrorStream()));

    if(reader.ready()) {
        buffer.append(reader.readLine());
        while(reader.ready()) {
            buffer.append('\n' + reader.readLine());
        }
    }
    reader.close();
    
    if(buffer.length() == 0)
        return "Error:\nri output overflowed native platform's standard input stream buffer.";
    else 
        return buffer.toString();
}

/**
 * Runs ri on supplied string search term and returns result string.
 */
ri(searchTerm) {
    if(searchTerm.length() == 0)
        searchTerm = "-c";
    return getOutput("ri -T " + searchTerm);
}

getScrollPane(label, closeAction) {
    scrollPane = new JScrollPane(label);
    final String CLOSE = "close";
    scrollPane.getActionMap().put(CLOSE, closeAction);

    InputMap inputMap = scrollPane.getInputMap();
    inputMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0), CLOSE);
    inputMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, 0), CLOSE);
    inputMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0), CLOSE);
    return scrollPane;
}
    
showDialog(frame, title, text) {
    final JDialog dialog = new JDialog(frame, title, false);
    label = new JTextArea(text);
    label.setEditable(false);
    label.setBackground(dialog.getContentPane().getBackground());
    pane = getScrollPane(label, new AbstractAction() {
        public void actionPerformed(ActionEvent e) {
            dialog.setVisible(false);
            dialog.dispose();
        }
    });

    dialog.setContentPane(pane);
    dialog.pack();
    
    height = dialog.getHeight();    
    if(dialog.getHeight() > frame.getHeight()*.8) {
        height = (int)(frame.getHeight()*.8);
    }

    dialog.setSize((int)(dialog.getWidth() *1.05), height);
    dialog.setLocationRelativeTo(frame);

    dialog.show();
}

/**
 * Displays dialog for user to enter search term.
 */
getSearchTerm() {
  term = textArea.getSelectedText();
  
  if(term == null) {
    term = jEdit.getProperty("ruby-ri-search-term", "");
  }
  
  term = Macros.input(view, "Search for:", term);
  return term;
}

cc_ri(searchTerm) {
  return getCommandOutput("/home/aaa/.jedit/macros/Ruby/cc_ri " + searchTerm);
}

/**
 * Performs Ruby documentation search.
 */
doSearch() {
  term = getSearchTerm();
  if(term != null) {
    jEdit.setProperty("ruby-ri-search-term", term);
//    Macros.message(view, ri(term));
    showDialog(view, "", ri(term));
  }
}

doSearch();