/*
* $Id$
*
* Copyright (C) 2003-2014 JNode.org
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.apps.editor;
import java.awt.event.KeyEvent;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.List;
import org.jnode.driver.console.ConsoleManager;
import org.jnode.driver.console.TextConsole;
import org.jnode.driver.console.textscreen.TextScreenConsoleManager;
import org.jnode.driver.input.KeyboardEvent;
import org.jnode.driver.input.KeyboardListener;
import org.jnode.naming.InitialNaming;
import org.jnode.shell.ShellManager;
/**
* @author Levente S\u00e1ntha
*/
public class TextEditor implements KeyboardListener {
private int cx, cy, sh, sw, cxm, cym, fx, fy;
private List<StringBuilder> ls;
private TextConsole console;
private File file;
private boolean ro = false;
public static void main(String[] argv) throws Exception {
if (argv.length == 0) {
System.out.println("No file specified");
return;
}
ShellManager sm = InitialNaming.lookup(ShellManager.NAME);
TextScreenConsoleManager manager = (TextScreenConsoleManager) sm.getCurrentShell().getConsole().getManager();
TextConsole console = manager.createConsole(
"editor",
(ConsoleManager.CreateOptions.TEXT |
ConsoleManager.CreateOptions.STACKED |
ConsoleManager.CreateOptions.NO_LINE_EDITTING |
ConsoleManager.CreateOptions.NO_SYSTEM_OUT_ERR));
try {
manager.focus(console);
TextEditor te = new TextEditor(console);
File f = new File(argv[0]);
te.ro = argv.length == 2 && "ro".equals(argv[1]);
te.loadFile(f);
} catch (Exception e) {
manager.unregisterConsole(console);
throw e;
}
}
public TextEditor(TextConsole console) {
this.console = console;
console.addKeyboardListener(this);
this.console.setCursorVisible(true);
cx = 0;
cy = 0;
sh = console.getHeight();
sw = console.getWidth();
cxm = sw - 1;
cym = sh - 1 - 1;
fx = 0;
fy = 0;
ls = new ArrayList<StringBuilder>();
}
public void loadFile(File f) throws IOException {
ls.clear();
if (f.exists()) {
BufferedReader br = new BufferedReader(new FileReader(f));
int c;
StringBuilder sb = new StringBuilder();
while ((c = br.read()) != -1) {
if (c == '\n') {
sb.append((char) c);
ls.add(sb);
sb = new StringBuilder();
} else {
sb.append((char) c);
}
}
if (sb.length() > 0)
ls.add(sb);
}
file = f;
updateScreen();
}
private String message;
private void saveFile() {
if (file == null) {
System.out.println("No file.");
return;
}
AccessController.doPrivileged(new PrivilegedAction<Void>() {
public Void run() {
try {
StringBuilder buf = new StringBuilder();
FileWriter fw = new FileWriter(file);
for (StringBuilder sb : ls)
buf.append(sb);
fw.write(buf.toString());
fw.flush();
fw.close();
message = "Saved " + file;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
});
}
private void updateScreen() {
char[] data = new char[sw * (cym + 1 + 1)];
int k = 0;
StringBuilder e = new StringBuilder();
List<StringBuilder> rl = new ArrayList<StringBuilder>();
for (int i = 0; i < cym + 1; i++) {
StringBuilder l = (fy + i < ls.size()) ? ls.get(fy + i) : e;
StringBuilder sb = new StringBuilder();
for (int j = 0; j < l.length(); j++) {
char c = l.charAt(j);
if (c == '\t') {
sb.append(' ');
sb.append(' ');
sb.append(' ');
sb.append(' ');
} else if (c == '\n') {
sb.append(' ');
} else {
sb.append(c);
}
}
rl.add(sb);
}
int tab_count = 0;
if (ls.size() > 0) {
CharSequence l = ls.get(oy()).subSequence(0, fx + cx);
for (int i = 0; i < l.length(); i++) {
if (l.charAt(i) == '\t') tab_count++;
}
}
int tx = fx + cx + 3 * tab_count;
int cx2 = cx + 3 * tab_count;
int fx2 = fx;
if (tx >= sw) {
cx2 = sw - 1;
fx2 = tx - cx2;
}
for (int i = 0; i < cym + 1; i++) {
StringBuilder l = rl.get(i);
for (int j = 0; j < sw; j++) {
char c = (fx2 + j < l.length()) ? l.charAt(fx2 + j) : ' ';
data[k++] = c;
}
}
if (message != null) {
e.append(message);
message = null;
} else {
e.append(ro ? "VIEW: " : "EDIT: ").append(file.getName()).
append(" [").append(fx2 + cx2 + 1).append(",").append(oy() + 1).append("]");
}
for (int j = 0; j < sw; j++) {
data[k++] = (j < e.length()) ? e.charAt(j) : ' ';
}
console.setChar(0, 0, data, 7);
console.setCursor(cx2, cy);
}
public void keyPressed(KeyboardEvent e) {
int k = e.getKeyCode();
if (ro ^ e.isControlDown()) {
switch (k) {
case KeyEvent.VK_UP: {
if (fy > 0) fy--;
break;
}
case KeyEvent.VK_DOWN: {
if (fy < my() - cym) fy++;
break;
}
case KeyEvent.VK_LEFT: {
if (fx > 0) fx--;
break;
}
case KeyEvent.VK_RIGHT: {
if (fx < mx()) fx++;
break;
}
case KeyEvent.VK_HOME: {
cx = fx = cy = fy = 0;
break;
}
case KeyEvent.VK_END: {
if (my() < cym) cy = my();
else {
cy = cym;
fy = my() - cy;
}
end();
break;
}
case KeyEvent.VK_Y: {
if (ro) break;
if (oy() >= 0 && oy() <= my()) {
ls.remove(oy());
if (cy > 0 && oy() == my() + 1) cy--;
else if (fy > 0) fy--;
}
break;
}
case KeyEvent.VK_S:
case KeyEvent.VK_F2: {
if (ro) break;
saveFile();
break;
}
case KeyEvent.VK_Q:
case KeyEvent.VK_F10: {
console.getManager().unregisterConsole(console);
break;
}
//same as without control key down
case KeyEvent.VK_PAGE_UP: {
if (fy > cym) fy -= cym;
else fy = 0;
break;
}
case KeyEvent.VK_PAGE_DOWN: {
if (my() - fy > cym) fy += cym;
break;
}
}
} else {
out:
switch (k) {
case KeyEvent.VK_UP: {
cursorUp();
break;
}
case KeyEvent.VK_DOWN: {
cursorDown();
break;
}
case KeyEvent.VK_LEFT: {
if (cx > 0) cx--;
else if (fx > 0) fx--;
else if (cursorUp()) end();
break;
}
case KeyEvent.VK_RIGHT: {
if (ox() < mx()) {
if (cx < cxm) cx++;
else fx++;
} else if (cursorDown()) {
cx = 0;
fx = 0;
}
break;
}
case KeyEvent.VK_HOME: {
cx = fx = 0;
break;
}
case KeyEvent.VK_END: {
end();
break;
}
//same as with control key down
case KeyEvent.VK_PAGE_UP: {
if (fy > cym) fy -= cym;
else fy = 0;
break;
}
case KeyEvent.VK_PAGE_DOWN: {
if (my() - fy > cym) fy += cym;
break;
}
default:
if (ro) break;
char c = e.getKeyChar();
if (c == KeyEvent.CHAR_UNDEFINED && k != KeyEvent.VK_DELETE) return;
if (cy == ls.size()) ls.add(new StringBuilder());
StringBuilder l = ls.get(oy());
switch (k) {
case KeyEvent.VK_ENTER: {
c = '\n';
ls.add(oy() + 1, new StringBuilder());
break;
}
case KeyEvent.VK_DELETE: {
if (cx == mx()) {
if (cy < my()) {
l.deleteCharAt(l.length() - 1).append(ls.remove(oy() + 1));
}
} else if (cx < mx())
l.deleteCharAt(ox());
break out;
}
case KeyEvent.VK_BACK_SPACE: {
if (ox() == 0) {
if (cy > 0) {
StringBuilder l2 = ls.get(oy() - 1);
cx = l2.length() - 1;
l2.deleteCharAt(l2.length() - 1).append(ls.remove(oy()));
cy--;
} else if (fy > 0) {
StringBuilder l2 = ls.get(oy() - 1);
cx = l2.length() - 1;
l2.deleteCharAt(l2.length() - 1).append(ls.remove(oy()));
fy--;
}
} else if (cx > 0) {
cx--;
l.deleteCharAt(ox());
} else {
fx--;
l.deleteCharAt(ox());
}
break out;
}
}
if (cx == l.length()) l.append(c);
else l.insert(ox(), c);
if (c == '\n') {
if (cy < cym) cy++;
else fy++;
if (cx < l.length() + 1) {
StringBuilder l2 = ls.get(oy());
l2.append(l, ox() + 1, l.length());
l.delete(ox() + 1, l.length());
}
cx = fx = 0;
} else {
if (cx == cxm) fx++;
else cx++;
}
}
}
if (oy() > cym && cy < 0) {
cy = cym;
fy = my() - cy;
}
if (oy() > my()) {
fy -= oy() - my();
fy = fy < 0 ? 0 : fy;
}
if (ox() > mx()) {
if (mx() > cxm) {
cx = cxm;
fx = mx() - cx;
} else {
cx = mx();
fx = 0;
}
}
e.consume();
updateScreen();
}
private void end() {
if (mx() < cxm)
cx = mx();
else {
cx = cxm;
fx = mx() - cx;
}
}
private boolean cursorUp() {
boolean ret;
if (ret = (cy > 0))
cy--;
else if (ret = (fy > 0))
fy--;
return ret;
}
private boolean cursorDown() {
boolean ret;
if (ret = (oy() < my()))
if (cy < cym) cy++;
else fy++;
return ret;
}
private int oy() {
return fy + cy;
}
private int ox() {
return fx + cx;
}
private int my() {
return ls.size() - 1;
}
private int mx() {
return ls.size() == 0 ? 0 : ls.get(oy()).length() - (oy() == my() ? 0 : 1);
}
public void keyReleased(KeyboardEvent event) {
}
}