Do not print empty blocks

output/flag.go

@@ -0,0 +1,15 @@
+package output
+
+import "flag"
+
+var (
+	fullOutput *bool
+	printEmptyBlocks *bool
+)
+
+func RegisterFlags() {
+	fullOutput = flag.Bool("full-output", false, "Show full output instead of limiting submodule output")
+	printEmptyBlocks = flag.Bool("print-empty-blocks", false, "Prints blocks (submodule output) even if the submodule doesn't have any content to print.")
+}
+
+

output/output.go

@@ -1,24 +1,20 @@
 package output
 
-import (
-	"flag"
-	"github.com/fatih/color"
-)
-
-var (
-	fullOutput *bool
-)
-
-func RegisterFlags() {
-	fullOutput = flag.Bool("full-output", false, "Show full output instead of limiting submodule output")
-}
+import "github.com/fatih/color"
 
 // Called at the very end, before terminating pancap
 func Finalize() {
+	printer := color.New(color.Bold, color.BgBlack)
+
 	// Check if we snipped, to add a notice how to show the whole block
 	if DidSnip {
 		// We snipped - inform user about this process
-		printer := color.New(color.Bold, color.BgBlack)
-		printer.Print("\nOutput is snipped at one or more positions. Add --full-output to avoid snipping.")
+		printer.Println("Output is snipped at one or more positions. Add --full-output to avoid snipping.")
+	}
+
+	// Check if we skipped printing an empty block
+	if DidAvoidEmptyBlock {
+		// We did - inform user about this
+		printer.Println("Some submodule output was hidden. Add --print-empty-blocks to show it.")
 	}
 }

output/printer.go

@@ -12,12 +12,20 @@ const (
 
 var (
 	DidSnip bool
+	DidAvoidEmptyBlock bool
 )
 
 // Prints a block of information with the given headline
 // If content is empty, printing the headline is omitted.
 // If the content is longer than MaxContentLines, content is cut.
 func PrintBlock(headline string, content string) {
+	// Avoid printing empty blocks - at least if user didn't specify it otherwise
+	if len(content) == 0 && !*printEmptyBlocks {
+		// No content and we are not forced to print empty blocks, return
+		DidAvoidEmptyBlock = true
+		return
+	}
+
 	// Print a newline to add some space between blocks
 	fmt.Println("")