Add notice about snipping process, if it happened

main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"flag"
 	"fmt"
+	"git.darknebu.la/maride/pancap/output"
 	"log"
 	"math/rand"
 	"time"
@@ -14,6 +15,7 @@ func main() {
 
 	// register flags
 	registerFileFlags()
+	output.RegisterFlags()
 	flag.Parse()
 
 	// Open the given PCAP
@@ -29,6 +31,9 @@ func main() {
 		// Mh, encountered some problems while analyzing file
 		log.Fatalf("Error occurred while analyzing: %s", analyzeErr.Error())
 	}
+
+	// Finalize output
+	output.Finalize()
 }
 
 // Prints a simple figlet-style ASCII art and a random quote

output/output.go

@@ -1,52 +1,24 @@
 package output
 
 import (
-	"fmt"
+	"flag"
 	"github.com/fatih/color"
 )
 
-const (
-	MaxContentLines = 50
+var (
+	fullOutput *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) {
-	// Print a newline to add some space between blocks
-	fmt.Println("")
-
-	// Check if we need to print a headline
-	if len(content) > 0 {
-		// We have content, we can print the headline
-		headlineColor := color.New(color.FgRed, color.Bold)
-		headlineColor.Println(headline)
-	}
-
-	// Cut to MaxContentLines if required
-	cutCont := cutContent(content)
-	fmt.Print(cutCont)
+func RegisterFlags() {
+	fullOutput = flag.Bool("full-output", false, "Show full output instead of limiting submodule output")
 }
 
-// Cut content after MaxContentLines lines
-func cutContent(content string) string {
-	numNewlines := 0
-
-	// iterate over every character
-	for i, c := range content {
-		// check if character is newline
-		if c == '\n' {
-			// it is, count occurrence
-			numNewlines++
-
-			// Check if we already hit our limit yet
-			if numNewlines == MaxContentLines {
-				// Found nth newline, return content up to this position.
-				return content[:i+1] // +1 to include the last newline as well
+// Called at the very end, before terminating pancap
+func Finalize() {
+	// 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.")
 	}
-		}
-	}
-
-	// We are done before reaching the cut limit; return the whole content
-	return content
 }

output/printer.go

@@ -0,0 +1,69 @@
+package output
+
+import (
+	"fmt"
+	"github.com/fatih/color"
+)
+
+const (
+	MaxContentLines = 50
+	SnipMark = "----- cut at 50 entries -----\n"
+)
+
+var (
+	DidSnip 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) {
+	// Print a newline to add some space between blocks
+	fmt.Println("")
+
+	// Check if we need to print a headline
+	if len(content) > 0 {
+		// We have content, we can print the headline
+		headlineColor := color.New(color.FgRed, color.Bold)
+		headlineColor.Println(headline)
+	}
+
+	// Cut to MaxContentLines if required
+	if !(*fullOutput) {
+		// User states that they don't want to see the whole output - cut content.
+		content = cutContent(content)
+	}
+
+	// And print our content.
+	fmt.Print(content)
+}
+
+// Cut content after MaxContentLines lines
+func cutContent(content string) string {
+	numNewlines := 0
+
+	// iterate over every character
+	for i, c := range content {
+		// check if character is newline
+		if c == '\n' {
+			// it is, count occurrence
+			numNewlines++
+
+			// Check if we already hit our limit yet
+			if numNewlines == MaxContentLines {
+				// Found nth newline, return content up to this position and add a notice about it.
+				DidSnip = true
+				return addSnipMark(content[:i])
+			}
+		}
+	}
+
+	// We are done before reaching the cut limit; return the whole content
+	return content
+}
+
+// Adds a notice about the snipping process
+func addSnipMark(content string) string {
+	printer := color.New(color.Bold)
+	return content + "\n" + printer.Sprint(SnipMark)
+}