Add a WithLevel function to scribe.Emitter

scribe/emitter.go

@@ -26,6 +26,13 @@ func NewEmitter(output io.Writer) Emitter {
 	}
 }
 
+// WithLevel takes in a log level string and configures the underlying Logger
+// log level. To enable debug logging the log level must be set to "DEBUG".
+func (e Emitter) WithLevel(level string) Emitter {
+	e.Logger = e.Logger.WithLevel(level)
+	return e
+}
+
 // SelectedDependency takes in a buildpack plan entry, a postal dependency, and
 // the current time, and prints out a message giving the name and version of
 // the dependency as well as the source of the request for that given

scribe/emitter_test.go

@@ -149,6 +149,38 @@ func testEmitter(t *testing.T, context spec.G, it spec.S) {
 		})
 	})
 
+	context("WithLevel", func() {
+		context("default", func() {
+			it("output includes debug level logs", func() {
+				emitter.Title("non-debug title")
+				emitter.Debug.Title("debug title")
+
+				Expect(buffer.String()).To(ContainLines(
+					"non-debug title",
+				))
+				Expect(buffer.String()).ToNot(ContainLines(
+					"debug title",
+				))
+			})
+		})
+
+		context("DEBUG", func() {
+			it.Before(func() {
+				emitter = emitter.WithLevel("DEBUG")
+			})
+
+			it("output includes debug level logs", func() {
+				emitter.Title("non-debug title")
+				emitter.Debug.Title("debug title")
+
+				Expect(buffer.String()).To(ContainLines(
+					"non-debug title",
+					"debug title",
+				))
+			})
+		})
+	})
+
 	context("Candidates", func() {
 		it("logs the candidate entries", func() {
 			emitter.Candidates([]packit.BuildpackPlanEntry{