Improved Logging

internal/topdata/topdata.go

@@ -36,6 +36,39 @@ type ValidationReport struct {
 	Diagnostics []Diagnostic
 }
 
+func (r ValidationReport) SummaryLines(maxPaths int) []string {
+	type key struct {
+		severity Severity
+		message  string
+	}
+	groups := map[key][]string{}
+	order := make([]key, 0)
+	for _, diagnostic := range r.Diagnostics {
+		k := key{severity: diagnostic.Severity, message: diagnostic.Message}
+		if _, ok := groups[k]; !ok {
+			order = append(order, k)
+		}
+		groups[k] = append(groups[k], diagnostic.Path)
+	}
+	slices.SortFunc(order, func(a, b key) int {
+		if a.severity != b.severity {
+			if a.severity == SeverityError {
+				return -1
+			}
+			return 1
+		}
+		return strings.Compare(a.message, b.message)
+	})
+	lines := make([]string, 0, len(order))
+	for _, k := range order {
+		paths := append([]string(nil), groups[k]...)
+		slices.Sort(paths)
+		paths = slices.Compact(paths)
+		lines = append(lines, formatDiagnosticSummaryLine(string(k.severity), k.message, paths, maxPaths))
+	}
+	return lines
+}
+
 func (r ValidationReport) HasErrors() bool {
 	for _, diagnostic := range r.Diagnostics {
 		if diagnostic.Severity == SeverityError {
@@ -65,6 +98,24 @@ func (r ValidationReport) WarningCount() int {
 	return count
 }
 
+func formatDiagnosticSummaryLine(prefix, message string, paths []string, maxPaths int) string {
+	if len(paths) == 0 {
+		return fmt.Sprintf("%s: %s", prefix, message)
+	}
+	if maxPaths <= 0 {
+		maxPaths = 3
+	}
+	display := paths
+	if len(display) > maxPaths {
+		display = display[:maxPaths]
+	}
+	location := strings.Join(display, ", ")
+	if len(paths) > len(display) {
+		location += fmt.Sprintf(", and %d more", len(paths)-len(display))
+	}
+	return fmt.Sprintf("%s: %s [%s]", prefix, message, location)
+}
+
 type BuildResult struct {
 	Mode         string
 	Output2DADir string