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generate.go
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generate.go
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// +build ignore
package main
import (
"bufio"
"log"
"os"
"strings"
"text/template"
)
//
// docker run --rm -v $(pwd):/tmp alpine:3.6 /bin/sh -c "apk add -U mailcap; mv /etc/mime.types /tmp"
//
type mime struct {
Name string
Exts []string
}
func main() {
in, err := os.Open("mime.types")
if err != nil {
log.Fatal(err)
}
defer in.Close()
var mimes []mime
scanner := bufio.NewScanner(in)
for scanner.Scan() {
txt := scanner.Text()
if strings.HasPrefix(txt, "#") || len(txt) == 0 {
continue
}
parts := strings.Fields(txt)
if len(parts) == 1 {
continue
}
mimes = append(mimes, mime{parts[0], parts[1:]})
}
err = scanner.Err()
if err != nil {
log.Fatal(err)
}
out, err := os.Create("mime_gen.go")
if err != nil {
log.Fatal(err)
}
defer out.Close()
template.Must(
template.New("_").Parse(templ),
).Execute(out, mimes)
}
var templ = `package mimetype
import "mime"
func init() {
{{- range . -}}
{{ $name := .Name -}}
{{- range .Exts }}
mime.AddExtensionType({{ printf "\".%s\"" . }}, {{ printf "%q" $name }})
{{- end }}
{{- end }}
}
`