Added JSON output format

SynchRoGazer.go

@@ -3,6 +3,7 @@ package main
 import (
 	"bufio"
 	"encoding/hex"
+	"encoding/json"
 	"flag"
 	"fmt"
 	"github.com/minio/md5-simd"
@@ -15,18 +16,18 @@ import (
 )
 
 type HashFileResult struct {
-	error  error
-	path   string
-	sha256 string
-	md5    string
+	Error  error
+	Path   string
+	SHA256 string
+	MD5    string
 }
 
 func HashFile(results chan<- HashFileResult, md5hasher *md5simd.Hasher, sha256hasher *hash.Hash, path string) {
 	fh, err := os.Open(path)
 	if err != nil {
 		results <- HashFileResult{
-			error: err,
-			path:  path,
+			Error: err,
+			Path:  path,
 		}
 		return
 	}
@@ -35,18 +36,35 @@ func HashFile(results chan<- HashFileResult, md5hasher *md5simd.Hasher, sha256ha
 	io.Copy(io.MultiWriter(*sha256hasher, *md5hasher), fh)
 
 	results <- HashFileResult{
-		error:  nil,
-		path:   path,
-		sha256: hex.EncodeToString((*sha256hasher).Sum(nil)),
-		md5:    hex.EncodeToString((*md5hasher).Sum(nil)),
+		Error:  nil,
+		Path:   path,
+		SHA256: hex.EncodeToString((*sha256hasher).Sum(nil)),
+		MD5:    hex.EncodeToString((*md5hasher).Sum(nil)),
 	}
 }
 
-func PrintHashFileResult(result *HashFileResult) {
-	if result.error != nil {
-		fmt.Fprintln(os.Stderr, result.path, "error: ", result.error)
-	} else {
-		fmt.Println(result.sha256, result.md5, result.path)
+func PrintHashFileResult(result *HashFileResult, format string) {
+	switch {
+	case format == "json":
+		var jsonData []byte
+		jsonData, err := json.Marshal(*result)
+		if err != nil {
+			fmt.Fprintln(os.Stderr, result.Path, "Error: ", result.Error)
+		} else {
+			if result.Error != nil {
+				fmt.Fprintln(os.Stderr, string(jsonData))
+			} else {
+				fmt.Println(string(jsonData))
+			}
+
+		}
+	case format == "text":
+		if result.Error != nil {
+			fmt.Fprintln(os.Stderr, result.Path, "Error: ", result.Error)
+		} else {
+			fmt.Println(result.SHA256, result.MD5, result.Path)
+		}
+
 	}
 }
 
@@ -59,6 +77,8 @@ func main() {
 		return result
 	}(), "Maximum number of concurrent hashing tasks. Change to avoid fdlimit issues. Defaults to number of min(128, CPU cores * 16)")
 
+	outputFormat := flag.String("format", "text", "Output formats. Allowed: text, json")
+
 	flag.Parse()
 
 	var taskCount int64
@@ -108,13 +128,13 @@ func main() {
 	//Already print before finishing, use atomic ints instead of a WaitGroup
 	for atomic.LoadInt64(&taskCount) > 0 {
 		result := <-resultChannel
-		PrintHashFileResult(&result)
+		PrintHashFileResult(&result, *outputFormat)
 	}
 
 	close(resultChannel)
 
 	for result := range resultChannel {
-		PrintHashFileResult(&result)
+		PrintHashFileResult(&result, *outputFormat)
 	}
 
 	close(md5hashers)