config: Create default configuration before parsing

config.go

@@ -35,33 +35,33 @@ func (t Task) Format(p *Page) (string, []byte) {
 	return t.postProcess.Format(p)
 }
 
-// LoadConfig loads the configuration from the provided path.
-func LoadConfig(path string) (*Config, error) {
+// DefaultConfig returns the default configuration.
+func DefaultConfig() *Config {
 	c := new(Config)
 	c.Feeds = make(map[string]string)
 	c.Tasks = make(map[string]*Task)
+	c.Tasks["gemini"] = &Task{
+		Input:       ".gmi",
+		Output:      ".gmi",
+		Template:    ".gmi",
+		Destination: "public",
+	}
+	return c
+}
 
+// LoadConfig loads the configuration from the provided path.
+func LoadConfig(path string) (*Config, error) {
 	f, err := os.Open(path)
 	if err != nil {
 		return nil, err
 	}
 	defer f.Close()
 
+	c := DefaultConfig()
 	if _, err := toml.DecodeReader(f, c); err != nil {
 		return nil, err
 	}
 
-	// Add default task
-	// The toml library overwrites the map, so add default values after parsing
-	if _, ok := c.Tasks["gemini"]; !ok {
-		c.Tasks["gemini"] = &Task{
-			Input:       ".gmi",
-			Output:      ".gmi",
-			Template:    ".gmi",
-			Destination: "public",
-		}
-	}
-
 	for _, task := range c.Tasks {
 		switch task.PostProcess {
 		case "":