bindata/main.go

123 lines
3.0 KiB
Go

// This work is subject to the CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
// license. Its contents can be found at:
// http://creativecommons.org/publicdomain/zero/1.0/
package main
import (
"flag"
"fmt"
"os"
"path"
"runtime"
"strings"
"unicode"
)
const (
AppName = "bindata"
AppVersion = "0.8"
)
func main() {
in := flag.String("i", "", "Path to the input file. Alternatively, pipe the file data into stdin.")
out := flag.String("o", "", "Optional path to the output file.")
pkgname := flag.String("p", "", "Optional name of the package to generate.")
funcname := flag.String("f", "", "Optional name of the function/variable to generate.")
uncompressed := flag.Bool("u", false, "The specified resource will /not/ be GZIP compressed when this flag is specified. This alters the generated output code.")
version := flag.Bool("v", false, "Display version information.")
flag.Parse()
if *version {
fmt.Fprintf(os.Stdout, "%s v%s (Go runtime %s)\n",
AppName, AppVersion, runtime.Version())
return
}
pipe := len(*in) == 0
if !pipe && len(*out) == 0 {
// Ensure we create our own output filename that does not already exist.
dir, file := path.Split(*in)
*out = path.Join(dir, file) + ".go"
if _, err := os.Lstat(*out); err == nil {
// File already exists. Pad name with a sequential number until we
// find a name that is available.
count := 0
for {
f := path.Join(dir, fmt.Sprintf("%s.%d.go", file, count))
if _, err := os.Lstat(f); err != nil {
*out = f
break
}
count++
}
}
fmt.Fprintf(os.Stderr, "[w] No output file specified. Using '%s'.\n", *out)
}
if len(*pkgname) == 0 {
fmt.Fprintln(os.Stderr, "[w] No package name specified. Using 'main'.")
*pkgname = "main"
} else {
if unicode.IsDigit(rune((*pkgname)[0])) {
// Identifier can't start with a digit.
*pkgname = "_" + *pkgname
}
}
if len(*funcname) == 0 {
if pipe {
// Can't infer from input file name in this mode.
fmt.Fprintln(os.Stderr, "[e] No function name specified.")
return
}
_, file := path.Split(*in)
file = strings.ToLower(file)
file = strings.Replace(file, " ", "_", -1)
file = strings.Replace(file, ".", "_", -1)
file = strings.Replace(file, "-", "_", -1)
if unicode.IsDigit(rune(file[0])) {
// Identifier can't start with a digit.
file = "_" + file
}
fmt.Fprintf(os.Stderr, "[w] No function name specified. Using '%s'.\n", file)
*funcname = file
}
// Read the input file, transform it into a gzip compressed data stream and
// write it out as a go source file.
if pipe {
translate(os.Stdin, os.Stdout, *pkgname, *funcname, *uncompressed)
fmt.Fprintln(os.Stdout, "[i] Done.")
return
}
var fs, fd *os.File
var err error
if fs, err = os.Open(*in); err != nil {
fmt.Fprintf(os.Stderr, "[e] %s\n", err)
return
}
defer fs.Close()
if fd, err = os.Create(*out); err != nil {
fmt.Fprintf(os.Stderr, "[e] %s\n", err)
return
}
defer fd.Close()
translate(fs, fd, *pkgname, *funcname, *uncompressed)
fmt.Fprintln(os.Stdout, "[i] Done.")
}