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// escargs reads lines from the standard input and prints shell-escaped
// versions. Unlike xargs, blank lines on the standard input are not
// discarded.
package main
import (
"bufio"
"flag"
"fmt"
"log"
"os"
"al.essio.dev/pkg/shellescape"
)
var (
discardBlankLines bool
nullSeparator bool
argFile string
helpMode bool
versionMode bool
)
var version = "UNRELEASED"
func init() {
flag.BoolVar(&discardBlankLines, "D", false, "ignore blank lines on the input stream.")
flag.BoolVar(&nullSeparator, "0", false, "input items are terminated by a null character instead of by new line.")
flag.StringVar(&argFile, "a", "", "read arguments from file, not standard input.")
flag.BoolVar(&helpMode, "h", false, "display this help and exit.")
flag.BoolVar(&versionMode, "V", false, "output version information and exit.")
flag.Usage = usage
flag.ErrHelp = nil
}
func main() {
log.SetFlags(0)
log.SetPrefix("escargs: ")
log.SetOutput(os.Stderr)
flag.Parse()
if helpMode {
usage()
return
}
if versionMode {
outputVersion()
return
}
firstScan := true
scanner := bufio.NewScanner(os.Stdin)
if argFile != "" {
f, err := os.Open(argFile)
if err != nil {
log.Fatal(err)
}
scanner = bufio.NewScanner(f)
}
if nullSeparator {
scanner.Split(shellescape.ScanTokens)
}
for scanner.Scan() {
line := scanner.Text()
if discardBlankLines && len(line) == 0 {
continue
}
if firstScan {
firstScan = false
} else {
fmt.Printf(" ")
}
fmt.Printf("%s", shellescape.Quote(line))
}
}
func usage() {
usageString := `Usage: escargs [-0ad]
Escape arbitrary strings for safe use as command line arguments.
Options:`
_, _ = fmt.Fprintln(os.Stderr, usageString)
flag.PrintDefaults()
}
func outputVersion() {
fmt.Fprintf(os.Stderr, "escargs version %s\n", version)
fmt.Fprintln(os.Stderr, "Copyright (C) 2020-2024 Alessio Treglia <alessio@debian.org>")
}
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