Append outputs of std.trace() function to the error diagnostics

CHANGELOG.md

@@ -1,3 +1,9 @@
+## 2.4.1 (Dec 17, 2024)
+
+IMPROVEMENTS:
+
+* Append outputs of std.trace() function to the error diagnostics.
+
 ## 2.4.0 (Dec 16, 2024)
 
 IMPROVEMENTS:

private/provider/data_source_jsonnet_file.go

@@ -172,13 +172,18 @@ func (d *JsonnetFileDataSource) Read(ctx context.Context, req datasource.ReadReq
 		}
 	}()
 
+	trace := traceOut.String()
+
 	if err != nil {
-		resp.Diagnostics.AddError("Failed to render test from jsonnet template", err.Error())
+		resp.Diagnostics.AddError(
+			"Failed to render test from jsonnet template",
+			strings.Join([]string{err.Error(), trace}, ""),
+		)
 		return
 	}
 
 	state.Rendered = types.StringValue(rendered)
-	state.Trace = types.StringValue(traceOut.String())
+	state.Trace = types.StringValue(trace)
 	state.Id = types.StringValue(hash(rendered))
 
 	resp.Diagnostics.Append(resp.State.Set(ctx, &state)...)

private/provider/data_source_jsonnet_file_test.go

@@ -261,3 +261,24 @@ func TestDataSourceJsonnetFile_RenderContentWithTrace(t *testing.T) {
 		},
 	})
 }
+
+func TestDataSourceJsonnetFile_AddTraceToDiagnostics(t *testing.T) {
+	resource.UnitTest(t, resource.TestCase{
+		ProtoV6ProviderFactories: testAccProtoV6ProviderFactories,
+		Steps: []resource.TestStep{
+			{
+				Config: `
+					data "jsonnet_file" "template" {
+						content = <<EOF
+						{
+							"a": std.trace("str", "rest"),
+							"b": 1/0,
+						}
+						EOF
+					}
+				`,
+				ExpectError: regexp.MustCompile(`(?s)RUNTIME ERROR: Division by zero\..*TRACE: data:2 str`),
+			},
+		},
+	})
+}