refactor logging and filters

internal/config/matcher.go

@@ -0,0 +1,42 @@
+package config
+
+import (
+	"errors"
+	"strings"
+)
+
+type MatcherPredicateType uint8
+
+const (
+	MatcherPredicateTypeUnknown MatcherPredicateType = iota
+	MatcherPredicateTypePattern
+	MatcherPredicateTypeRegexp
+)
+
+func (t *MatcherPredicateType) UnmarshalText(data []byte) error {
+	switch dataStr := strings.ToLower(string(data)); dataStr {
+	case "":
+		*t = MatcherPredicateTypeUnknown
+	case "pattern":
+		*t = MatcherPredicateTypePattern
+	case "regexp":
+		*t = MatcherPredicateTypeRegexp
+	default:
+		return errors.New("unsupported type " + dataStr)
+	}
+
+	return nil
+}
+
+type MatcherPredicate struct {
+	Value string               `toml:"value"`
+	Type  MatcherPredicateType `toml:"type"`
+}
+
+type DimensionMatcher struct {
+	CaseInsensitive bool `toml:"case_insensitive"`
+
+	Length []MatcherPredicate `toml:"length"`
+	Width  []MatcherPredicate `toml:"width"`
+	Height []MatcherPredicate `toml:"height"`
+}