swap context string buffer for a slice

note/context.go

@@ -1,25 +1,32 @@
 package note
 
-import "strings"
+import (
+	"strings"
+
+	"github.com/ionous/tell/runes"
+)
 
 // provides communication between note takers:
 // each in progress document decoder should have its own unique context.
 // concrete instances shouldn't be copied.
-type Context struct {
-	buf strings.Builder
-}
+type Context []string
 
-func (ctx *Context) writeInto(out *strings.Builder) {
-	if str := ctx.buf.String(); len(str) > 0 {
-		out.WriteString(str)
-		ctx.buf.Reset()
-	}
+func (ctx *Context) pending() bool {
+	return len(*ctx) > 0
 }
 
 func (ctx *Context) append(str string) {
-	appendLine(&ctx.buf, str)
+	(*ctx) = append(*ctx, str)
 }
 
-func (ctx *Context) pending() bool {
-	return ctx.buf.Len() > 0
+func (ctx *Context) writeInto(out *strings.Builder) {
+	if ctx.pending() {
+		for i, el := range *ctx {
+			if i > 0 {
+				out.WriteRune(runes.Newline)
+			}
+			out.WriteString(el)
+		}
+		*ctx = (*ctx)[:0]
+	}
 }