Introduce client runtime boundaries

1 files changed, 34 insertions, 0 deletions

diff --git a/internal/mapr/result_renderer.go b/internal/mapr/result_renderer.go
new file mode 100644
index 0000000..e03ed9a
--- /dev/null
+++ b/internal/mapr/result_renderer.go
@@ -0,0 +1,34 @@
+package mapr
+
+import "strings"
+
+// ResultRenderer formats terminal table output for mapreduce results.
+type ResultRenderer interface {
+	WriteHeaderEntry(sb *strings.Builder, text string, isSortKey, isGroupKey bool)
+	WriteHeaderDelimiter(sb *strings.Builder, text string)
+	WriteDataEntry(sb *strings.Builder, text string)
+	WriteDataDelimiter(sb *strings.Builder, text string)
+}
+
+type plainResultRenderer struct{}
+
+// PlainResultRenderer returns a renderer that writes uncolored terminal output.
+func PlainResultRenderer() ResultRenderer {
+	return plainResultRenderer{}
+}
+
+func (plainResultRenderer) WriteHeaderEntry(sb *strings.Builder, text string, _, _ bool) {
+	sb.WriteString(text)
+}
+
+func (plainResultRenderer) WriteHeaderDelimiter(sb *strings.Builder, text string) {
+	sb.WriteString(text)
+}
+
+func (plainResultRenderer) WriteDataEntry(sb *strings.Builder, text string) {
+	sb.WriteString(text)
+}
+
+func (plainResultRenderer) WriteDataDelimiter(sb *strings.Builder, text string) {
+	sb.WriteString(text)
+}