X-Git-Url: https://git.giacomolli.uk/onechat/blobdiff_plain/feda522eba3e2a27c91741c77d0d01f1840c0004..09cde69fdffe2721434392036f98dc241177f5a1:/view.go?ds=inline

diff --git a/view.go b/view.go
index 3ccf87e..a75b1d8 100644
--- a/view.go
+++ b/view.go
@@ -41,8 +41,8 @@ type nodeReader interface {
 // For the sibling pair (l, i) and (l, i+1), due is (T - last) / 2^l, with T the
 // number of messages and last the ID of the last message of the pair. That is
 // how long ago the pair ended, measured in its own line size. With a budget of
-// the length of Taelin's rollback push list, this order makes the same merges
-// as the push. The oldest pair wins a tie.
+// the length of the rollback push list of the reference design, this order
+// makes the same merges as the push. The oldest pair wins a tie.
 type View struct {
 	high    int
 	low     int
@@ -280,15 +280,25 @@ func (v *View) lineSize(line nodeKey) int {
 // Render returns the view as the model reads it: one line "id+n|text" for each
 // node inside <chat> tags, with the newlines of the text as spaces.
 func (v *View) Render() string {
-	var text strings.Builder
-	text.WriteString("<chat>\n")
+	return "<chat>\n" + strings.Join(v.LinesWithout(nil), "") + "</chat>"
+}
+
+// LinesWithout returns the lines of the view as the model reads them, each with
+// its newline, without the leaf lines of the messages in skip. A line that
+// merges such a message with others stays.
+func (v *View) LinesWithout(skip map[int]bool) []string {
+	lines := make([]string, 0, len(v.lines))
 	for _, line := range v.lines {
+		if line.level == 0 && skip[line.index] {
+			continue
+		}
+
+		var text strings.Builder
 		v.renderLine(&text, line)
+		lines = append(lines, text.String())
 	}
 
-	text.WriteString("</chat>")
-
-	return text.String()
+	return lines
 }
 
 // renderLine writes one view line, "id+n|text", and a newline.