Initial commit

internal/glance/config.go

@@ -0,0 +1,79 @@
+package glance
+
+import (
+	"fmt"
+	"io"
+
+	"gopkg.in/yaml.v3"
+)
+
+type Config struct {
+	Server Server `yaml:"server"`
+	Theme  Theme  `yaml:"theme"`
+	Pages  []Page `yaml:"pages"`
+}
+
+func NewConfigFromYml(contents io.Reader) (*Config, error) {
+	config := NewConfig()
+
+	contentBytes, err := io.ReadAll(contents)
+
+	if err != nil {
+		return nil, err
+	}
+
+	err = yaml.Unmarshal(contentBytes, config)
+
+	if err != nil {
+		return nil, err
+	}
+
+	if err = configIsValid(config); err != nil {
+		return nil, err
+	}
+
+	return config, nil
+}
+
+func NewConfig() *Config {
+	config := &Config{}
+
+	config.Server.Host = ""
+	config.Server.Port = 8080
+
+	return config
+}
+
+func configIsValid(config *Config) error {
+	for i := range config.Pages {
+		if config.Pages[i].Title == "" {
+			return fmt.Errorf("Page %d has no title", i+1)
+		}
+
+		if len(config.Pages[i].Columns) == 0 {
+			return fmt.Errorf("Page %d has no columns", i+1)
+		}
+
+		if len(config.Pages[i].Columns) > 3 {
+			return fmt.Errorf("Page %d has more than 3 columns: %d", i+1, len(config.Pages[i].Columns))
+		}
+
+		columnSizesCount := make(map[string]int)
+
+		for j := range config.Pages[i].Columns {
+			if config.Pages[i].Columns[j].Size != "small" && config.Pages[i].Columns[j].Size != "full" {
+				return fmt.Errorf("Column %d of page %d: size can only be either small or full", j+1, i+1)
+			}
+
+			columnSizesCount[config.Pages[i].Columns[j].Size]++
+		}
+
+		full := columnSizesCount["full"]
+
+		if full > 2 || full == 0 {
+			return fmt.Errorf("Page %d must have either 1 or 2 full width columns", i+1)
+		}
+	}
+
+	return nil
+}