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// +build ignore
// go run generate.go && go fmt
// The generate-charset-data command generates the Go source code
// for github.com/paulrosania/go-charset/data from the data files
// found in github.com/paulrosania/go-charset/datafiles.
// It should be run in the go-charset root directory.
// The resulting Go files will need gofmt'ing.
package main
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"text/template"
)
type info struct {
Path string
}
var tfuncs = template.FuncMap{
"basename": func(s string) string {
return filepath.Base(s)
},
"read": func(path string) ([]byte, error) {
return ioutil.ReadFile(path)
},
}
var tmpl = template.Must(template.New("").Funcs(tfuncs).Parse(`
// This file is automatically generated by generate-charset-data.
// Do not hand-edit.
package data
import (
"github.com/paulrosania/go-charset/charset"
"io"
"io/ioutil"
"strings"
)
func init() {
charset.RegisterDataFile({{basename .Path | printf "%q"}}, func() (io.ReadCloser, error) {
r := strings.NewReader({{read .Path | printf "%q"}})
return ioutil.NopCloser(r), nil
})
}
`))
var docTmpl = template.Must(template.New("").Funcs(tfuncs).Parse(`
// This file is automatically generated by generate-charset-data.
// Do not hand-edit.
// The {{basename .Package}} package embeds all the charset
// data files as Go data. It registers the data with the charset
// package as a side effect of its import. To use:
//
// import _ "github.com/paulrosania/go-charset"
package {{basename .Package}}
`))
func main() {
dataDir := filepath.Join("..", "datafiles")
d, err := os.Open(dataDir)
if err != nil {
fatalf("%v", err)
}
names, err := d.Readdirnames(0)
if err != nil {
fatalf("cannot read datafiles dir: %v", err)
}
for _, name := range names {
writeFile("data_"+name+".go", tmpl, info{
Path: filepath.Join(dataDir, name),
})
}
}
func writeFile(name string, t *template.Template, data interface{}) {
w, err := os.Create(name)
if err != nil {
fatalf("cannot create output file: %v", err)
}
defer w.Close()
err = t.Execute(w, data)
if err != nil {
fatalf("template execute %q: %v", name, err)
}
}
func fatalf(f string, a ...interface{}) {
fmt.Fprintf(os.Stderr, "%s\n", fmt.Sprintf(f, a...))
os.Exit(2)
}
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