Add go-charset and chardet to vendor

vendor/github.com/paulrosania/go-charset/cmd/tcs/tcs.go

@@ -0,0 +1,103 @@
+package main
+
+import (
+	"bytes"
+	"flag"
+	"fmt"
+	"github.com/paulrosania/go-charset/charset"
+	_ "github.com/paulrosania/go-charset/charset/iconv"
+	"io"
+	"os"
+	"strings"
+)
+
+var listFlag = flag.Bool("l", false, "list available character sets")
+var verboseFlag = flag.Bool("v", false, "list more information")
+var fromCharset = flag.String("f", "utf-8", "translate from this character set")
+var toCharset = flag.String("t", "utf-8", "translate to this character set")
+
+func main() {
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr, "usage: tcs [-l] [-v] [charset]\n")
+		fmt.Fprintf(os.Stderr, "\ttcs [-f charset] [-t charset] [file]\n")
+	}
+	flag.Parse()
+	if *listFlag {
+		cs := ""
+		switch flag.NArg() {
+		case 1:
+			cs = flag.Arg(0)
+		case 0:
+		default:
+			flag.Usage()
+		}
+		listCharsets(*verboseFlag, cs)
+		return
+	}
+	var f *os.File
+	switch flag.NArg() {
+	case 0:
+		f = os.Stdin
+	case 1:
+		var err error
+		f, err = os.Open(flag.Arg(0))
+		if err != nil {
+			fatalf("cannot open %q: %v", err)
+		}
+	}
+	r, err := charset.NewReader(*fromCharset, f)
+	if err != nil {
+		fatalf("cannot translate from %q: %v", *fromCharset, err)
+	}
+	w, err := charset.NewWriter(*toCharset, os.Stdout)
+	if err != nil {
+		fatalf("cannot translate to %q: ", err)
+	}
+	_, err = io.Copy(w, r)
+	if err != nil {
+		fatalf("%v", err)
+	}
+}
+
+func listCharsets(verbose bool, csname string) {
+	var buf bytes.Buffer
+	if !verbose {
+		if csname != "" {
+			cs := charset.Info(csname)
+			if cs == nil {
+				fatalf("no such charset %q", csname)
+			}
+			fmt.Fprintf(&buf, "%s %s\n", cs.Name, strings.Join(cs.Aliases, " "))
+		} else {
+			fmt.Fprintf(&buf, "%v\n", strings.Join(charset.Names(), " "))
+		}
+	} else {
+		var charsets []*charset.Charset
+		if csname != "" {
+			cs := charset.Info(csname)
+			if cs == nil {
+				fatalf("no such charset %q", csname)
+			}
+			charsets = []*charset.Charset{cs}
+		} else {
+			for _, name := range charset.Names() {
+				if cs := charset.Info(name); cs != nil {
+					charsets = append(charsets, cs)
+				}
+			}
+		}
+		for _, cs := range charsets {
+			fmt.Fprintf(&buf, "%s %s\n", cs.Name, strings.Join(cs.Aliases, " "))
+			if cs.Desc != "" {
+				fmt.Fprintf(&buf, "\t%s\n", cs.Desc)
+			}
+		}
+	}
+	os.Stdout.Write(buf.Bytes())
+}
+
+func fatalf(f string, a ...interface{}) {
+	s := fmt.Sprintf(f, a...)
+	fmt.Fprintf(os.Stderr, "%s\n", s)
+	os.Exit(2)
+}