initial public release

internal/scan/filter.go

@@ -0,0 +1,40 @@
+package scan
+
+import "strings"
+
+// TitleMatcher returns true if a title should be kept.
+type TitleMatcher func(title string) bool
+
+// NewTitleMatcher builds a case-insensitive positive/negative matcher.
+// At least one positive must match (or positives empty) AND zero negatives.
+func NewTitleMatcher(f TitleFilter) TitleMatcher {
+	pos := lower(f.Positive)
+	neg := lower(f.Negative)
+	return func(title string) bool {
+		lt := strings.ToLower(title)
+		hasPos := len(pos) == 0
+		for _, p := range pos {
+			if strings.Contains(lt, p) {
+				hasPos = true
+				break
+			}
+		}
+		if !hasPos {
+			return false
+		}
+		for _, n := range neg {
+			if strings.Contains(lt, n) {
+				return false
+			}
+		}
+		return true
+	}
+}
+
+func lower(ss []string) []string {
+	out := make([]string, 0, len(ss))
+	for _, s := range ss {
+		out = append(out, strings.ToLower(s))
+	}
+	return out
+}