Update go.mod

README.md

@@ -313,7 +313,7 @@ Content:
 #!/usr/bin/env sh
 
 if [ "$3" = "exec" ]; then
-	command ls | format -i "$1" -o "mv \"{0}\" \"$2\"" | xargs -0 -P 4 sh -c
+	command ls | format -0 -i "$1" -o "mv \"{0}\" \"$2\"" | xargs -0 -P 4 -I {} sh -c "{}"
 else
 	command ls | format -i "$1" -o "mv \"{0}\" \"$2\""
 	echo

go.mod

@@ -1,9 +1,13 @@
-module git.milar.in/milarin/format
+module git.tordarus.net/tordarus/format
 
 go 1.18
 
 require (
-	github.com/fatih/color v1.13.0 // indirect
+	git.milar.in/milarin/buildinfo v1.0.0
+	github.com/fatih/color v1.13.0
+)
+
+require (
 	github.com/mattn/go-colorable v0.1.12 // indirect
 	github.com/mattn/go-isatty v0.0.14 // indirect
 	golang.org/x/sys v0.0.0-20220517195934-5e4e11fc645e // indirect

go.sum

@@ -1,3 +1,5 @@
+git.milar.in/milarin/buildinfo v1.0.0 h1:tw98GupUYl/0a/3aPGuezhE4wseycOSsbcLp70hy60U=
+git.milar.in/milarin/buildinfo v1.0.0/go.mod h1:arI9ZoENOgcZcanv25k9y4dKDUhPp0buJrlVerGruas=
 github.com/fatih/color v1.13.0 h1:8LOYc1KYPPmyKMuN8QV2DNRWNbLo6LZ0iLs8+mlH53w=
 github.com/fatih/color v1.13.0/go.mod h1:kLAiJbzzSOZDVNGyDpeOxJ47H46qBXwg5ILebYFFOfk=
 github.com/mattn/go-colorable v0.1.9/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=

main.go

@@ -10,9 +10,11 @@ import (
 	"strconv"
 	"strings"
 	"unicode/utf8"
+
+	"git.milar.in/milarin/buildinfo"
 )
 
-var (
+var ( //flags
 	// regex with sub groups
 	input = flag.String("i", `^(.|\n)*?$`, "input pattern")
 
@@ -45,6 +47,14 @@ var (
 	// it may be useful to have a boolean flag for this behavior
 	lineParseAmount = flag.Int("n", 1, "amount of lines to feed into input pattern")
 
+	showVersion = flag.Bool("v", false, "show version and exit")
+
+	OutputNullByte = flag.Bool("0", false, "use nullbyte instead of newline as line separator for printing output")
+)
+
+var ( // globals
+	LineSeparator string = "\n"
+
 	replacePattern     = regexp.MustCompile(`\{(\d+)(?::(.*?))?(?::(.*?))?(?::(.*?))?\}`)
 	numMutationPattern = regexp.MustCompile(`([+\-*/])(\d+|\((\d+)\))`)
 )
@@ -52,6 +62,15 @@ var (
 func main() {
 	flag.Parse()
 
+	if *showVersion {
+		buildinfo.Print(buildinfo.Options{})
+		return
+	}
+
+	if *OutputNullByte {
+		LineSeparator = string(rune(0))
+	}
+
 	pattern, err := regexp.Compile(*input)
 	if err != nil {
 		panic(err)
@@ -64,12 +83,12 @@ func main() {
 
 		if len(matches) == 0 {
 			if *keepUnmatched {
-				fmt.Println(line)
+				fmt.Print(line, LineSeparator)
 			}
 			continue
 		}
 
-		fmt.Println(replaceVars(escapedOutput, matches...))
+		fmt.Print(replaceVars(escapedOutput, matches...), LineSeparator)
 	}
 }
 
@@ -78,32 +97,15 @@ func readLines(r io.Reader) <-chan string {
 
 	go func(out chan<- string, source io.Reader) {
 		defer close(out)
-
 		r := bufio.NewReader(source)
 
 		for {
-			var line string
-			var err error
-			lines := make([]string, 0, *lineParseAmount)
-			for line, err = r.ReadString('\n'); ; line, err = r.ReadString('\n') {
-				if rn, size := utf8.DecodeLastRuneInString(line); rn == '\n' {
-					line = line[:len(line)-size]
-				}
-
-				lines = append(lines, line)
-
-				// stop reading as soon as lineParseAmount is reached or an error occured (most likely EOF)
-				if len(lines) == cap(lines) || err != nil {
-					break
-				}
-			}
-
-			linesCombined := strings.Join(lines, "\n")
+			line, err := ReadLine(r)
 
 			// use data as line if reading was successfull or EOF has been reached
 			// in the latter case: only use data if something could be read until EOF
-			if err == nil || err == io.EOF && linesCombined != "" {
-				out <- linesCombined
+			if err == nil || err == io.EOF && line != "" {
+				out <- line
 			}
 
 			if err != nil {
@@ -115,8 +117,30 @@ func readLines(r io.Reader) <-chan string {
 	return ch
 }
 
+func ReadLine(r *bufio.Reader) (string, error) {
+	lines := make([]string, 0, *lineParseAmount)
+
+	var line string
+	var err error
+	for line, err = r.ReadString('\n'); ; line, err = r.ReadString('\n') {
+		if rn, size := utf8.DecodeLastRuneInString(line); rn == '\n' {
+			line = line[:len(line)-size]
+		}
+
+		lines = append(lines, line)
+
+		// stop reading as soon as lineParseAmount is reached or an error occured (most likely EOF)
+		if len(lines) == cap(lines) || err != nil {
+			break
+		}
+	}
+
+	linesCombined := strings.Join(lines, "\n")
+	return linesCombined, err
+}
+
 func replaceVars(format string, vars ...string) string {
-	replacements := replacePattern.FindAllStringSubmatch(format, -1)
+	replacements := replacePattern.FindAllStringSubmatch(format, -1) // TODO arguments do not change in outer loop (can be moved to main method)
 
 	for _, replacement := range replacements {
 		rplStr := replacement[0]