feat: bootstrap cli entrypoint with bubble tea and toml config

internal/config/config.go

@@ -0,0 +1,70 @@
+package config
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/BurntSushi/toml"
+)
+
+const configFileName = "config.toml"
+
+// Config is the user-owned TOML configuration for parasocial.
+type Config struct {
+	Streamers []string `toml:"streamers"`
+}
+
+// DefaultPath returns the config file path relative to the current working directory.
+func DefaultPath() string {
+	return configFileName
+}
+
+// LoadDefault reads config from the current working directory.
+func LoadDefault() (Config, error) {
+	return Load(DefaultPath())
+}
+
+// Load reads, normalizes, and validates a TOML config file.
+func Load(path string) (Config, error) {
+	var cfg Config
+	if _, err := toml.DecodeFile(path, &cfg); err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			return Config{}, fmt.Errorf("config file not found at %s", path)
+		}
+		return Config{}, fmt.Errorf("load config %s: %w", path, err)
+	}
+
+	cfg.Streamers = normalizeStreamers(cfg.Streamers)
+	if len(cfg.Streamers) == 0 {
+		return Config{}, fmt.Errorf("config %s must define at least one streamer", path)
+	}
+
+	return cfg, nil
+}
+
+func normalizeStreamers(streamers []string) []string {
+	seen := make(map[string]struct{}, len(streamers))
+	normalized := make([]string, 0, len(streamers))
+
+	for _, streamer := range streamers {
+		streamer = normalizeStreamer(streamer)
+		if streamer == "" {
+			continue
+		}
+		if _, ok := seen[streamer]; ok {
+			continue
+		}
+		seen[streamer] = struct{}{}
+		normalized = append(normalized, streamer)
+	}
+
+	return normalized
+}
+
+func normalizeStreamer(streamer string) string {
+	streamer = strings.TrimSpace(streamer)
+	streamer = strings.TrimPrefix(streamer, "#")
+	return strings.ToLower(strings.TrimSpace(streamer))
+}