Set version in about page from pom.xml variable.

This will be set in the imported files.

README.md

@@ -24,7 +24,7 @@ mvn package
 Using Maven:
 
 ```bash
-mvn exec:java@com.calendar.CalendarApp
+mvn exec:java
 ```
 
 Using Java directly:

pom.xml

@@ -29,6 +29,12 @@
     </dependencies>
 
     <build>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
         <plugins>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>

src/main/java/net/themusicinnoise/vaccalc/CalendarPanel.java

@@ -10,12 +10,14 @@ import java.util.HashSet;
 import java.util.Set;
 
 public class CalendarPanel extends JPanel {
+    private PointEngine pointEngine;
     private YearMonth currentMonth;
     private final int cellHeight = 60;
     private final int cellWidth = 80;
     private final Set<LocalDate> selectedDates = new HashSet<>();
 
-    public CalendarPanel() {
+    public CalendarPanel(PointEngine pointEngine) {
+        this.pointEngine = pointEngine;
         this.currentMonth = YearMonth.now();
         setPreferredSize(new Dimension(7 * cellWidth, 8 * cellHeight));
         setBackground(Color.WHITE);
@@ -67,6 +69,9 @@ public class CalendarPanel extends JPanel {
     }
 
     private void toggleSelection(LocalDate date) {
+        if (pointEngine.getPointsOfDay(date) == 0.0)
+            return;
+
         if (selectedDates.contains(date)) {
             selectedDates.remove(date);
         } else {
@@ -77,7 +82,13 @@ public class CalendarPanel extends JPanel {
     }
 
     public double getTotalPoints() {
-        return selectedDates.size() * 1.0;
+        double totalPoints = 0.0;
+
+        for (LocalDate date : selectedDates) {
+            totalPoints += pointEngine.getPointsOfDay(date);
+        }
+
+        return totalPoints;
     }
 
     private LocalDate getDateAtPoint(int x, int y) {
@@ -148,13 +159,18 @@ public class CalendarPanel extends JPanel {
             LocalDate cellDate = currentMonth.atDay(day);
             boolean isToday = cellDate.equals(today);
             boolean isSelected = selectedDates.contains(cellDate);
+            double points = pointEngine.getPointsOfDay(cellDate);
 
-            if (isSelected) {
+            if (points == 0.0) {
+                g.setColor(new Color(255, 100, 100));
+                g.fillRect(x, y, cellWidth, cellHeight);
+            } else if (isSelected && isToday) {
+                g.setColor(new Color(123, 166, 180));
+                g.fillRect(x, y, cellWidth, cellHeight);
+            } else if (isSelected) {
                 g.setColor(new Color(173, 216, 230));
                 g.fillRect(x, y, cellWidth, cellHeight);
-            }
-
-            if (isToday) {
+            } else if (isToday) {
                 g.setColor(new Color(255, 200, 100));
                 g.fillRect(x, y, cellWidth, cellHeight);
             }
@@ -167,7 +183,7 @@ public class CalendarPanel extends JPanel {
             int textY = y + (cellHeight - fm.getHeight()) / 2 + fm.getAscent() - 8;
             g.drawString(dayStr, textX, textY);
 
-            String pointsStr = "(1.0)";
+            String pointsStr = "(" + points + ")";
             Font smallFont = new Font("Arial", Font.PLAIN, 10);
             FontMetrics smallFm = g.getFontMetrics(smallFont);
             g.setFont(smallFont);

src/main/java/net/themusicinnoise/vaccalc/PointEngine.java

@@ -0,0 +1,110 @@
+package net.themusicinnoise.vaccalc;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.time.DayOfWeek;
+import java.time.LocalDate;
+import java.time.Month;
+import java.time.format.DateTimeFormatter;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class PointEngine {
+    private double defaultPoints;
+
+    static private class PointRule {
+        private enum RuleType {
+            DAY_OF_WEEK,
+            MONTH,
+            DATE,
+        }
+
+        static final Pattern DOW_PATTERN = Pattern.compile("dow=(sun|mon|tue|wed|thu|fri|sat) (\\d+\\.\\d+)", Pattern.CASE_INSENSITIVE);
+        static final Pattern MONTH_PATTERN = Pattern.compile("m=(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec) (\\d+\\.\\d+)", Pattern.CASE_INSENSITIVE);
+        static final Pattern DATE_PATTERN = Pattern.compile("(\\d{4}-\\d{2}-\\d{2}) (\\d+\\.\\d+)", Pattern.CASE_INSENSITIVE);
+
+        private RuleType type;
+        private DayOfWeek dow;
+        private Month mon;
+        private LocalDate date;
+        private double points;
+
+        public PointRule(String def) {
+            Matcher dowMatcher = DOW_PATTERN.matcher(def);
+            Matcher monthMatcher = MONTH_PATTERN.matcher(def);
+            Matcher dateMatcher = DATE_PATTERN.matcher(def);
+
+            if (dowMatcher.find()) {
+                this.type = RuleType.DAY_OF_WEEK;
+                this.points = Double.parseDouble(dowMatcher.group(2));
+                this.dow = DayOfWeek.from(DateTimeFormatter.ofPattern("EEE").parse(dowMatcher.group(1)));
+            } else if (monthMatcher.find()) {
+                this.type = RuleType.MONTH;
+                this.points = Double.parseDouble(monthMatcher.group(2));
+                this.mon = Month.from(DateTimeFormatter.ofPattern("MMM").parse(monthMatcher.group(1)));
+            } else if (dateMatcher.find()) {
+                this.type = RuleType.DATE;
+                this.points = Double.parseDouble(dateMatcher.group(2));
+                this.date = LocalDate.parse(dateMatcher.group(1), DateTimeFormatter.ofPattern("yyyy-MM-dd"));
+            } else {
+                throw new IllegalArgumentException("Invalid line: '" + def + "'");
+            }
+        }
+
+        public boolean applies(LocalDate date) {
+            switch (type) {
+                case DAY_OF_WEEK:
+                    return this.dow == date.getDayOfWeek();
+                case MONTH:
+                    return this.mon == date.getMonth();
+                case DATE:
+                    return this.date.isEqual(date);
+            }
+            return false;
+        }
+
+        public double getPoints() { return points; }
+    }
+    private List<PointRule> rules;
+
+    public PointEngine() {
+        defaultPoints = 1.0;
+        rules = new ArrayList<>();
+    }
+
+    public void importPointsFile(File pointsFile) {
+        Pattern defaultPattern = Pattern.compile("default (\\d+\\.\\d+)");
+
+        try (BufferedReader br = new BufferedReader(new FileReader(pointsFile))) {
+            String line;
+            while ((line = br.readLine()) != null) {
+                if (line.isEmpty() || line.charAt(0) == '#')
+                    continue;
+
+                Matcher defaultMatcher = defaultPattern.matcher(line);
+                if (defaultMatcher.find()) {
+                    defaultPoints = Double.parseDouble(defaultMatcher.group(1));
+                } else {
+                    rules.addFirst(new PointRule(line));
+                }
+            }
+        } catch (IOException e) {
+            throw new RuntimeException("Failed to read points file: " + pointsFile, e);
+        }
+    }
+
+    public void reset() { rules.clear(); }
+
+    public double getPointsOfDay(LocalDate date) {
+        for (PointRule rule : rules) {
+            if (rule.applies(date)) {
+                return rule.getPoints();
+            }
+        }
+        return defaultPoints;
+    }
+}

src/main/java/net/themusicinnoise/vaccalc/VacCalc.java

@@ -2,12 +2,17 @@ package net.themusicinnoise.vaccalc;
 
 import javax.swing.*;
 import java.awt.*;
+import java.awt.event.*;
+import java.io.*;
 import java.time.YearMonth;
+import java.util.Properties;
+import java.util.stream.Collectors;
 
 public class VacCalc extends JFrame {
     private CalendarPanel calendarPanel;
     private JLabel monthLabel;
     private JLabel pointsLabel;
+    private PointEngine pointEngine;
 
     public VacCalc() {
         setTitle("VacCalc");
@@ -15,7 +20,77 @@ public class VacCalc extends JFrame {
         setResizable(false);
         setLocationRelativeTo(null);
 
-        calendarPanel = new CalendarPanel();
+        JMenuBar menuBar = new JMenuBar();
+        JMenu appMenu = new JMenu("VacCalc");
+        JMenuItem importItem = new JMenuItem("Import points");
+        importItem.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent ev) {
+                JFileChooser fileChooser = new JFileChooser();
+                int ret = fileChooser.showOpenDialog(VacCalc.this);
+                if(ret == JFileChooser.APPROVE_OPTION) {
+                    try {
+                        pointEngine.importPointsFile(fileChooser.getSelectedFile());
+                    } catch(RuntimeException ex) {
+                        ex.printStackTrace();
+                        JOptionPane.showMessageDialog(VacCalc.this, ex.getMessage(), "Parsing Error",
+                                JOptionPane.ERROR_MESSAGE);
+                        pointEngine.reset();
+                    }
+                }
+                calendarPanel.repaint();
+            }
+        });
+        appMenu.add(importItem);
+        JMenuItem exitItem = new JMenuItem("Exit");
+        exitItem.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                System.exit(0);
+            }
+        });
+        appMenu.add(exitItem);
+        menuBar.add(appMenu);
+        JMenu helpMenu = new JMenu("Help");
+        JMenuItem manualItem = new JMenuItem("Usage Manual");
+        manualItem.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent ev) {
+                BufferedReader br = new BufferedReader(new InputStreamReader(getClass().getClassLoader().getResourceAsStream("manual.html")));
+                String manualText = br.lines().collect(Collectors.joining());
+                JEditorPane textArea = new JEditorPane("text/html", manualText);
+                textArea.setEditable(false);
+                JFrame manualFrame = new JFrame("VacCalc Manual");
+                manualFrame.getContentPane().add(new JScrollPane(textArea));
+                manualFrame.setSize(500, 500);
+                manualFrame.setVisible(true);
+            }
+        });
+        helpMenu.add(manualItem);
+        JMenuItem aboutItem = new JMenuItem("About");
+        aboutItem.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent ev) {
+                BufferedReader br = new BufferedReader(new InputStreamReader(getClass().getClassLoader().getResourceAsStream("about.html")));
+                Properties properties = new Properties();
+                try {
+                    properties.load(getClass().getClassLoader().getResourceAsStream("project.properties"));
+                } catch (IOException e) {
+                    System.err.println("Failed to load project properties.");
+                    e.printStackTrace();
+                }
+                String aboutText = br.lines().collect(Collectors.joining());
+                aboutText = aboutText.replace("VERSION", properties.getProperty("version"));
+                JOptionPane.showMessageDialog(VacCalc.this, aboutText, "About",
+                        JOptionPane.INFORMATION_MESSAGE);
+            }
+        });
+        helpMenu.add(aboutItem);
+        menuBar.add(helpMenu);
+        setJMenuBar(menuBar);
+
+        pointEngine = new PointEngine();
+        calendarPanel = new CalendarPanel(pointEngine);
 
         JPanel headerPanel = createHeaderPanel();
         JPanel footerPanel = createFooterPanel();
@@ -94,7 +169,7 @@ public class VacCalc extends JFrame {
 
     private void updatePointsLabel() {
         double points = calendarPanel.getTotalPoints();
-        pointsLabel.setText(String.format("Total Points: %.1f", points));
+        pointsLabel.setText(String.format("Total Points: %.3f", points));
     }
 
     public static void main(String[] args) {

src/main/resources/about.html

@@ -0,0 +1,7 @@
+<html>
+	<p><b>VacCalc VERSION</b></p>
+	<hr />
+    <p>Copyright &copy; 2026 Nicolás A. Ortega Froysa &lt;nicolas@ortegas.org&gt;</p>
+	<p>License: Zlib</p>
+    <p>Home page: <a href="https://code.ortegas.org/nortega/vaccalc" >https://code.ortegas.org/nortega/vaccalc</a></p>
+</html>

src/main/resources/manual.html

@@ -0,0 +1,59 @@
+<html>
+	<h1>VacCalc Manual</h1>
+	<hr />
+	<p>VacCalc assigns points to each day on the basis of the rules found in a
+	file which is imported via the “VacCalc &gt; Import points” menu item. This
+	file must be written manually. What follows are descriptions on how to write
+	this file.</p>
+	<h2>Rules</h2>
+	<p>There are a total of four different kinds of rules possible: default,
+	date, day-of-week, and month. Rules are applied with a priority for the last
+	defined rule, with the exception of the default rule which is only used if
+	no other rule applies.</p>
+	<h3>Default Rule</h3>
+	<p>Definition: <code>default <i>points</i></code></p>
+	<p>The default rule establishes the default point value for every day of the
+	year. E.g. <code>default 1.0</code> sets the default points to
+	<code>1.0</code>.
+	<h3>Date Rule</h3>
+	<p>Definition: <code><i>YYYY</i>-<i>MM</i>-<i>DD</i> <i>points</i></code></p>
+	<p>A date rule specifies the points which a specific date has. E.g.
+	<code>2026-12-24 0.5</code> would set Christmas Eve (December
+	24<sup>th</sup>) of 2026 to <code>0.5</code> points</p>
+	<h3>Day-Of-Week Rule</h3>
+	<p>Definition: <code>dow=<i>day</i> <i>points</i></p>
+	<p>A day-of-week rule specifies the points for all days of the year which
+	coincide with a particular day of the week. This day of the week is
+	specified using the three-letter format, such as <code>Fri</code> for
+	Friday. E.g. <code>dow=Fri 0.8</code> would set all Fridays of the year to
+	<code>0.8</code> points.</p>
+	<h3>Month Rule</h3>
+	<p>Definition: <code>m=<i>month</i> <i>points</i></p>
+	<p>A month rule establishes the same points for every day of a given month.
+	E.g. <code>m=Aug 0.8</code> sets all the days of the month of August to
+	<code>0.8</code> points.
+	<h3>Zero Point Rules</h3>
+	<p>Rules that have zero points allocated to them (i.e. <code>0.0</code>) are
+	considered <em>free days</em>, and as such are disabled. This could be
+	assigned to days such as Christmas or the Weekends (Saturday and
+	Sunday).</p>
+	<h3>Comments</h3>
+	<p>Definition: <code># <i>comment</i></p>
+	<p>Comments are supported in single lines starting with the <code>#</code>
+	character. Everything after that is ignored by the parser.</p>
+	<h3>Example</h3>
+	<code>
+		default 1.0<br />
+		dow=Fri 0.825<br />
+		m=Jul 0.825<br />
+		m=Aug 0.825<br />
+		2026-12-24 0.5<br />
+		2026-12-31 0.5<br />
+		<br />
+		# Weekends and Holidays<br />
+		dow=Sun 0.0<br />
+		dow=Sat 0.0<br />
+		2026-01-01 0.0<br />
+		2026-12-25 0.0
+	</code>
+</html>

src/main/resources/project.properties

@@ -0,0 +1 @@
+version=${project.version}

vac-points.txt

@@ -0,0 +1,12 @@
+default 1.0
+dow=Fri 0.825
+m=Jul 0.825
+m=Aug 0.825
+2026-12-24 0.5
+2026-12-31 0.5
+
+# Weekends & Holidays
+dow=Sun 0.0
+dow=Sat 0.0
+2026-01-01 0.0
+2026-12-25 0.0