Allow as many whitespace as the user wants.

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

@@ -69,6 +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 {
@@ -156,8 +159,12 @@ 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 && isToday) {
+            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) {
@@ -176,7 +183,7 @@ public class CalendarPanel extends JPanel {
             int textY = y + (cellHeight - fm.getHeight()) / 2 + fm.getAscent() - 8;
             g.drawString(dayStr, textX, textY);
 
-            String pointsStr = "(" + pointEngine.getPointsOfDay(cellDate) + ")";
+            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

@@ -23,9 +23,9 @@ public class PointEngine {
             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);
+        static final Pattern DOW_PATTERN = Pattern.compile("dow=(sun|mon|tue|wed|thu|fri|sat)\\s+(\\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)\\s+(\\d+\\.\\d+)", Pattern.CASE_INSENSITIVE);
+        static final Pattern DATE_PATTERN = Pattern.compile("(\\d{4}-\\d{2}-\\d{2})\\s+(\\d+\\.\\d+)", Pattern.CASE_INSENSITIVE);
 
         private RuleType type;
         private DayOfWeek dow;
@@ -77,16 +77,19 @@ public class PointEngine {
     }
 
     public void importPointsFile(File pointsFile) {
-        Pattern defaultPattern = Pattern.compile("default (\\d+\\.\\d+)");
+        Pattern defaultPattern = Pattern.compile("default\\s+(\\d+\\.\\d+)", Pattern.CASE_INSENSITIVE);
 
         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.add(new PointRule(line));
+                    rules.addFirst(new PointRule(line));
                 }
             }
         } catch (IOException e) {
@@ -97,12 +100,11 @@ public class PointEngine {
     public void reset() { rules.clear(); }
 
     public double getPointsOfDay(LocalDate date) {
-        double points = defaultPoints;
         for (PointRule rule : rules) {
             if (rule.applies(date)) {
-                points = rule.getPoints();
+                return rule.getPoints();
             }
         }
-        return points;
+        return defaultPoints;
     }
 }

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

@@ -3,7 +3,10 @@ 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;
@@ -48,6 +51,42 @@ public class VacCalc extends JFrame {
         });
         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();

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

@@ -1,6 +1,12 @@
 default 1.0
 dow=Fri 0.825
-2026-12-24 0.5
-2026-12-31 0.5
 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