Bin piping restricted to a special character

README.md

@@ -170,7 +170,7 @@ ascii-image-converter myImage.jpeg
 
 > **Note:** Piped binary input is also supported
 > ```
-> cat myImage.png | ascii-image-converter
+> cat myImage.png | ascii-image-converter -
 > ```
 
 

aic_package/convert_gif.go

@@ -52,15 +52,15 @@ func pathIsGif(gifPath, urlImgName string, pathIsURl bool, urlImgBytes, pipedInp
 		err         error
 	)
 
-	if isInputFromPipe() {
+	if gifPath == "-" {
 		originalGif, err = gif.DecodeAll(bytes.NewReader(pipedInputBytes))
 	} else if pathIsURl {
 		originalGif, err = gif.DecodeAll(bytes.NewReader(urlImgBytes))
 	} else {
 		originalGif, err = gif.DecodeAll(localGif)
 	}
 	if err != nil {
-		if isInputFromPipe() {
+		if gifPath == "-" {
 			return fmt.Errorf("can't decode piped input: %v", err)
 		} else {
 			return fmt.Errorf("can't decode %v: %v", gifPath, err)

aic_package/convert_image.go

@@ -34,15 +34,15 @@ func pathIsImage(imagePath, urlImgName string, pathIsURl bool, urlImgBytes, pipe
 		err    error
 	)
 
-	if isInputFromPipe() {
+	if imagePath == "-" {
 		imData, _, err = image.Decode(bytes.NewReader(pipedInputBytes))
 	} else if pathIsURl {
 		imData, _, err = image.Decode(bytes.NewReader(urlImgBytes))
 	} else {
 		imData, _, err = image.Decode(localImg)
 	}
 	if err != nil {
-		if isInputFromPipe() {
+		if imagePath == "-" {
 			return "", fmt.Errorf("can't decode piped input: %v", err)
 		} else {
 			return "", fmt.Errorf("can't decode %v: %v", imagePath, err)

aic_package/convert_root.go

@@ -121,7 +121,7 @@ func Convert(filePath string, flags Flags) (string, error) {
 
 	// Different modes of reading data depending upon whether or not filePath is a url
 
-	if !isInputFromPipe() {
+	if filePath != "-" {
 		if pathIsURl {
 			fmt.Printf("Fetching file from url...\r")
 
@@ -152,6 +152,10 @@ func Convert(filePath string, flags Flags) (string, error) {
 	} else {
 		// Check file/data type of piped input
 
+		if !isInputFromPipe() {
+			return "", fmt.Errorf("there is no input being piped to stdin")
+		}
+
 		pipedInputBytes, err = ioutil.ReadAll(os.Stdin)
 		if err != nil {
 			return "", fmt.Errorf("unable to read piped input: %v", err)

aic_package/util.go

@@ -67,7 +67,7 @@ func createSaveFileName(imagePath, urlImgName, label string) (string, error) {
 		return newName + label, nil
 	}
 
-	if isInputFromPipe() {
+	if imagePath == "-" {
 		if inputIsGif {
 			return "piped-gif" + label, nil
 		}

aic_package/winsize/winsize_unix.go

@@ -1,4 +1,5 @@
-// +build unix, !windows
+//go:build (unix && ignore) || !windows
+// +build unix,ignore !windows
 
 package winsize
 

aic_package/winsize/winsize_windows.go

@@ -1,4 +1,5 @@
-// +build windows, !unix
+//go:build (windows && ignore) || !unix
+// +build windows,ignore !unix
 
 package winsize
 

cmd/root.go

@@ -58,7 +58,7 @@ var (
 	rootCmd = &cobra.Command{
 		Use:     "ascii-image-converter [image paths/urls or piped stdin]",
 		Short:   "Converts images and gifs into ascii art",
-		Version: "1.13.0",
+		Version: "1.13.1",
 		Long:    "This tool converts images into ascii art and prints them on the terminal.\nFurther configuration can be managed with flags.",
 
 		// Not RunE since help text is getting larger and seeing it for every error impacts user experience
@@ -93,8 +93,8 @@ var (
 				OnlySave:            onlySave,
 			}
 
-			if isInputFromPipe() {
-				printAscii("", flags)
+			if args[0] == "-" {
+				printAscii(args[0], flags)
 				return
 			}
 

cmd/util.go

@@ -18,7 +18,6 @@ package cmd
 
 import (
 	"fmt"
-	"os"
 	"path"
 )
 
@@ -28,6 +27,8 @@ func checkInputAndFlags(args []string) bool {
 	gifCount := 0
 	gifPresent := false
 	nonGifPresent := false
+	pipeCharPresent := false
+
 	for _, arg := range args {
 		extension := path.Ext(arg)
 
@@ -37,6 +38,10 @@ func checkInputAndFlags(args []string) bool {
 		} else {
 			nonGifPresent = true
 		}
+
+		if arg == "-" {
+			pipeCharPresent = true
+		}
 	}
 
 	if gifPresent && nonGifPresent && !onlySave {
@@ -60,11 +65,16 @@ func checkInputAndFlags(args []string) bool {
 		return true
 	}
 
-	if !isInputFromPipe() && len(args) < 1 {
+	if len(args) < 1 {
 		fmt.Printf("Error: Need at least 1 input path/url or piped input\nUse the -h flag for more info\n\n")
 		return true
 	}
 
+	if len(args) > 1 && pipeCharPresent {
+		fmt.Printf("Error: You cannot pass in piped input alongside other inputs\n\n")
+		return true
+	}
+
 	if customMap != "" && len(customMap) < 2 {
 		fmt.Printf("Need at least 2 characters for --map flag\n\n")
 		return true
@@ -169,8 +179,3 @@ func checkInputAndFlags(args []string) bool {
 
 	return false
 }
-
-func isInputFromPipe() bool {
-	fileInfo, _ := os.Stdin.Stat()
-	return fileInfo.Mode()&os.ModeCharDevice == 0
-}

snapcraft.yaml

@@ -1,6 +1,6 @@
 name: ascii-image-converter
 base: core18 
-version: "1.13.0"
+version: "1.13.1"
 summary: Convert images and gifs into ascii art
 description: |
   ascii-image-converter is a command-line tool that converts images into ascii art and prints