More granular progress report for JSPF and scrobblerlog

internal/models/models.go

@@ -22,6 +22,7 @@ THE SOFTWARE.
 package models
 
 import (
+	"iter"
 	"strings"
 	"time"
 
@@ -244,3 +245,38 @@ func (p *Progress) Complete() {
 func (p *Progress) Abort() {
 	p.Aborted = true
 }
+
+func IterExportProgress[T any](
+	items []T, t *TransferProgress, c chan TransferProgress,
+) iter.Seq2[int, T] {
+	return iterProgress(items, t, t.Export, c, true)
+}
+
+func IterImportProgress[T any](
+	items []T, t *TransferProgress, c chan TransferProgress,
+) iter.Seq2[int, T] {
+	return iterProgress(items, t, t.Import, c, false)
+}
+
+func iterProgress[T any](
+	items []T, t *TransferProgress,
+	p *Progress, c chan TransferProgress,
+	autocomplete bool,
+) iter.Seq2[int, T] {
+	// Report progress in 1% steps
+	steps := len(items) / 100
+	return func(yield func(int, T) bool) {
+		for i, item := range items {
+			yield(i, item)
+			p.Elapsed++
+			if i%steps == 0 {
+				c <- *t
+			}
+		}
+
+		if autocomplete {
+			p.Complete()
+			c <- *t
+		}
+	}
+}