FTE Gui.java

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;
import javax.swing.event.*;

import java.io.*;
import java.util.*;

public class Gui extends JFrame{
    private File file;
    private JLabel label;
    private JButton openFile;
    private JButton save;
    private JTextArea textArea;

    public Gui(){
        super("Frost Text Editor");
        FlowLayout layout = new FlowLayout();
        layout.setAlignment(FlowLayout.LEFT);
        setLayout(layout);


        openFile = new JButton("Open\\Create");
        openFile.setToolTipText("Open or Create the file you want to edit.");
        add(openFile);
        openFile.addActionListener(
                new ActionListener(){
                    public void actionPerformed(ActionEvent event){
                        JFileChooser chooser = new JFileChooser();
                        int returnVal = chooser.showOpenDialog(getContentPane());
                        file = chooser.getSelectedFile();
                        if(returnVal == JFileChooser.APPROVE_OPTION) {
                            if(file.exists()){
                           label.setText("Opened file: " +
                                file.getName());
                           label.setToolTipText(file.getAbsolutePath());
                           textArea.setText(readFile(file));
                            } else{
                                JOptionPane.showMessageDialog(null, "You tried to open a non exist file.");
                                if(JOptionPane.showConfirmDialog(null, "Would you want to create that file?") == 0){
                                    if(createFile(file)){
                                        autoComplete(file.getName());
                                        label.setText("Opened file: " +
                                                file.getName());
                                        label.setToolTipText(file.getAbsolutePath());
                                    }
                                }
                            }
                        }

                    }
                }

        );

        save = new JButton("Save");
        add(save);
        save.addActionListener(
        new ActionListener(){
            public void actionPerformed(ActionEvent event){
                if(file != null){
                    try {
                        Formatter f = new Formatter(file.getAbsolutePath());
                        f.format("%s", textArea.getText());
                        f.close();
                        label.setText("The file: " + file.getName() + " has been saved succesfly");
                    } catch (FileNotFoundException e) {

                        e.printStackTrace();
                    }
                } else {
                    JOptionPane.showMessageDialog(null, "You must open\\create a file first");
                }

            }
        }

        );

        label = new JLabel();
        add(label);


        textArea = new JTextArea("I think Frost Text Editor is the best editor!", 25, 50);
        textArea.setFont(new Font("Arial", Font.PLAIN, 14));
        JScrollPane scrollPane = new JScrollPane(textArea);
        textArea.setEditable(true);
        add(scrollPane);



    }

    private boolean createFile(File f){
        if(!f.exists()){
            try{
                Formatter x = new Formatter(f.getAbsolutePath());
                JOptionPane.showMessageDialog(null, "File created succesfly");
                return true;

            }
            catch(Exception e){
                JOptionPane.showMessageDialog(null, "Couldn't create the file.");
                return false;
            }
        }
        return false;
    }

    private String readFile(File f){
        try{
            String fileContains = "";
            Scanner in = new Scanner(f);
            while(in.hasNextLine()){
                String line = in.nextLine();
                fileContains += line + "\n";
            }
            in.close();
            return fileContains;
        }
        catch(Exception e){
            return "";
        }
    }

    private void autoComplete(String name){
        int num = name.lastIndexOf('.');
        String start = name.substring(0, num);
        String end = name.substring(num + 1, name.length());
        switch(end){
            case "html":
                String text = "<!DOCTYPE html>\n<html>\n\t<head>\n\t\t<title></title>\n\t</head>\n\t<body>\n\t\t\n\t</body>\n</html>";
                textArea.setText(text);
                break;
            case "java":
                String text1 = "public class " + start + " {\n";
                text1 += "  public static void main(String[] args) {\n\n\n\n\t}\n}";
                textArea.setText(text1);
                break;
            case "php":
                textArea.setText("<?php\n\n\n\n?>");
                break;
            case "cs":
                String text2 = "public class Test\n{\n\tpublic static void Main()\n\t{\n\t\t// your code goes here\n\t}\n}";
                textArea.setText(text2);
                break;
            case "py":
                textArea.setText("# your code goes here");
                break;
            case "pl":
                textArea.setText("#!/usr/bin/perl\n# your code goes here");
                break;
            case "js":
                textArea.setText("// your code goes here");
                break;
            case "rb":
                textArea.setText("# your code goes here");
                break;
            case "c":
                String text3 = "#include <stdio.h>\n\nint main(void) {\n\t// your code goes here\n\treturn 0;\n}";
                textArea.setText(text3);
                break;
            case "cpp":

                break;
        }
    }
}