Initial commit.

internal/config/config.go

@@ -0,0 +1,53 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+
+	"go.dev.pztrn.name/periodicator/internal/gitlab"
+	"go.dev.pztrn.name/periodicator/internal/tasks"
+	"gopkg.in/yaml.v2"
+)
+
+// Config is a global configuration structure.
+type Config struct {
+	Gitlab gitlab.Config  `yaml:"gitlab"`
+	Tasks  []tasks.Config `yaml:"tasks"`
+}
+
+// Parse tries to parse configuration and returns filled structure.
+func Parse() *Config {
+	configPath, found := os.LookupEnv("GPT_CONFIG")
+	if !found {
+		panic("No configuration file path provided in 'GPT_CONFIG' environment variable!")
+	}
+
+	if strings.HasPrefix(configPath, "~") {
+		homeDir, err := os.UserHomeDir()
+		if err != nil {
+			panic("Failed to get user's home directory: " + err.Error())
+		}
+
+		configPath = strings.Replace(configPath, "~", homeDir, 1)
+	}
+
+	configPath, absErr := filepath.Abs(configPath)
+	if absErr != nil {
+		panic("Failed to get absolute path for '" + configPath + "': " + absErr.Error())
+	}
+
+	data, readErr := os.ReadFile(configPath)
+	if readErr != nil {
+		panic("Failed to read configuration file data: " + readErr.Error())
+	}
+
+	// nolint:exhaustivestruct
+	c := &Config{}
+
+	if err := yaml.Unmarshal(data, c); err != nil {
+		panic("Failed to unmarshal YAML data: " + err.Error())
+	}
+
+	return c
+}