Generate the USB ID data using 'go generate'

usbid/load.go

@@ -60,6 +60,8 @@ func LoadFromURL(url string) error {
 	return nil
 }
 
+//go:generate go run regen/regen.go --template regen/load_data.go.tpl -o load_data.go
+
 func init() {
 	ids, cls, err := ParseIDs(strings.NewReader(usbIdListData))
 	if err != nil {

usbid/load_data.go

@@ -19,8 +19,8 @@ import "time"
 // LastUpdate stores the latest time that the library was updated.
 //
 // The baked-in data was last generated:
-//   2016-04-03 11:25:26.920427461 -0700 PDT
-var LastUpdate = time.Unix(0, 1459707926920427461)
+//   2016-04-03 20:03:19.628811942 -0700 PDT
+var LastUpdate = time.Unix(0, 1459738999628811942)
 
 const usbIdListData = `#
 #	List of USB ID's

usbid/regen/load_data.go.tpl

@@ -0,0 +1,25 @@
+// Copyright 2013 Google Inc.  All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package usbid
+
+import "time"
+
+// LastUpdate stores the latest time that the library was updated.
+//
+// The baked-in data was last generated:
+//   {{.Generated}}
+var LastUpdate = time.Unix(0, {{.Generated.UnixNano}})
+
+const usbIdListData = `{{printf "%s" .Data}}`

usbid/regen/regen.go

@@ -0,0 +1,102 @@
+// Copyright 2013 Google Inc.  All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"bytes"
+	"flag"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+	"text/template"
+	"time"
+
+	"github.com/kylelemons/gousb/usbid"
+)
+
+var (
+	remote   = flag.String("url", usbid.LinuxUsbDotOrg, "URL from which to download new vendor data")
+	dataFile = flag.String("template", "load_data.go.tpl", "Template filename")
+	outFile  = flag.String("o", "load_data.go", "Output filename")
+)
+
+func main() {
+	flag.Parse()
+
+	log.Printf("Fetching %q...", *remote)
+	resp, err := http.Get(*remote)
+	if err != nil {
+		log.Fatalf("failed to download from %q: %s", *remote, err)
+	}
+	defer resp.Body.Close()
+
+	data, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		log.Fatalf("failed to read %q: %s", *remote, err)
+	}
+
+	ids, cls, err := usbid.ParseIDs(bytes.NewReader(data))
+	if err != nil {
+		log.Fatalf("failed to parse %q: %s", *remote, err)
+	}
+
+	log.Printf("Successfully fetched %q:", *remote)
+	log.Printf("  Loaded %d Vendor IDs", len(ids))
+	log.Printf("  Loaded %d Class IDs", len(cls))
+
+	rawTemplate, err := ioutil.ReadFile(*dataFile)
+	if err != nil {
+		log.Fatalf("failed to read template %q: %s", *dataFile)
+	}
+
+	template, err := template.New("").Parse(string(rawTemplate))
+	if err != nil {
+		log.Fatalf("failed to parse template %q: %s", *dataFile, err)
+	}
+
+	out, err := os.Create(*outFile)
+	if err != nil {
+		log.Fatalf("failed to open output file %q: %s", *outFile, err)
+	}
+	defer out.Close()
+
+	templateData := struct {
+		Data      []byte
+		Generated time.Time
+		RFC3339   string
+	}{
+		Data:      bytes.Map(sanitize, data),
+		Generated: time.Now(),
+	}
+	if err := template.Execute(out, templateData); err != nil {
+		log.Fatalf("failed to execute template: %s", err)
+	}
+
+	log.Printf("Successfully wrote %q", *outFile)
+}
+
+// sanitize strips characters that can't be `-quoted
+func sanitize(r rune) rune {
+	switch {
+	case r == '`':
+		return -1
+	case r == '\t', r == '\n':
+		return r
+	case r >= ' ' && r <= '~':
+		return r
+	}
+	return -1
+}