Main directory becomes the library. go-bindata subdir holds

the command code.

go-bindata/config.go

@@ -0,0 +1,106 @@
+// 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/filepath"
+	"strings"
+)
+
+// Config defines command line options.
+type Config struct {
+	Input  string   // Input directory with assets.
+	Output string   // Output directory for generated code.
+	Tags   []string // Build tags to include in output files.
+}
+
+// NewConfig create s anew, filled configuration instance
+// by reading and parsing command line options.
+//
+// This function exits the program with an error, if
+// any of the command line options are incorrect.
+func NewConfig() *Config {
+	var version bool
+	var tagstr string
+
+	c := new(Config)
+
+	flag.Usage = func() {
+		fmt.Printf("Usage: %s [options] <input> [<output>]\n\n", os.Args[0])
+		flag.PrintDefaults()
+	}
+
+	flag.StringVar(&tagstr, "tags", "", "Comma-separated list of build tags to include.")
+	flag.BoolVar(&version, "version", false, "Displays version information.")
+	flag.Parse()
+
+	if version {
+		fmt.Printf("%s\n", Version())
+		os.Exit(0)
+	}
+
+	// Make sure we have in/output paths.
+	if flag.NArg() == 0 {
+		fmt.Fprintf(os.Stderr, "Missing asset directory.\n")
+		os.Exit(1)
+	}
+
+	// Test validity of input path.
+	c.Input = filepath.Clean(flag.Arg(0))
+
+	stat, err := os.Lstat(c.Input)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Input path: %v.\n", err)
+		os.Exit(1)
+	}
+
+	if !stat.IsDir() {
+		fmt.Fprintf(os.Stderr, "Input path is not a directory.\n")
+		os.Exit(1)
+	}
+
+	// Find and test validity of output path.
+	if flag.NArg() > 1 {
+		c.Output = filepath.Clean(flag.Arg(1))
+
+		stat, err := os.Lstat(c.Output)
+		if err != nil {
+			if !os.IsNotExist(err) {
+				fmt.Fprintf(os.Stderr, "Output path: %v.\n", err)
+				os.Exit(1)
+			}
+
+			// Create output directory
+			err = os.MkdirAll(c.Output, 0744)
+			if err != nil {
+				fmt.Fprintf(os.Stderr, "Create Output directory: %v.\n", err)
+				os.Exit(1)
+			}
+
+		} else if !stat.IsDir() {
+			fmt.Fprintf(os.Stderr, "Output path is not a directory.\n")
+			os.Exit(1)
+		}
+	} else {
+		// If no output path is specified, use the current directory.
+		c.Output, err = os.Getwd()
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Unable to determine current working directory: %v\n", err)
+			os.Exit(1)
+		}
+	}
+
+	// Process build tags.
+	if len(tagstr) > 0 {
+		c.Tags = strings.Split(tagstr, ",")
+	} else {
+		c.Tags = append(c.Tags, "debug")
+	}
+
+	return c
+}

go-bindata/main.go

@@ -0,0 +1,14 @@
+// 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 (
+	"fmt"
+)
+
+func main() {
+	cfg := NewConfig()
+	fmt.Println(cfg)
+}

go-bindata/version.go

@@ -0,0 +1,31 @@
+// 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 (
+	"fmt"
+	"runtime"
+)
+
+const (
+	AppName         = "bindata"
+	AppVersionMajor = 3
+	AppVersionMinor = 1
+)
+
+// revision part of the program version.
+// This will be set automatically at build time like so:
+//
+//     go build -ldflags "-X main.AppVersionRev `date -u +%s`"
+var AppVersionRev string
+
+func Version() string {
+	if len(AppVersionRev) == 0 {
+		AppVersionRev = "0"
+	}
+
+	return fmt.Sprintf("%s %d.%d.%s (Go runtime %s).\nCopyright (c) 2010-2013, Jim Teeuwen.",
+		AppName, AppVersionMajor, AppVersionMinor, AppVersionRev, runtime.Version())
+}