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package main
import (
"io"
"io/ioutil"
"os"
"mime/multipart"
"strings"
"path"
"fmt"
)
type enhancer struct {
pattern []string
head string
tail string
}
func loadEnhancers(filename string) []enhancer {
file, err := os.Open(filename)
errcheck(err)
reader := multipart.NewReader(file, "boundary")
var s uint8 = 0
var e enhancer
var ret []enhancer
for {
part, err := reader.NextPart()
if err == io.EOF {
return ret
}
errcheck(err)
k := part.Header.Get("X-Thing")
v, err := ioutil.ReadAll(part)
errcheck(err)
switch k {
case "Pattern":
patterns := strings.Split(string(v), ";")
for i := range patterns {
patterns[i] = strings.TrimSpace(patterns[i])
}
s |= 1<<0
e.pattern = patterns
case "Head":
s |= 1<<1
e.head = string(v)
case "Tail":
s |= 1<<2
e.tail = string(v)
default:
panic("unknown X-Thing: "+k)
}
if s == 1<<0 | 1<<1 | 1<<2 {
ret = append(ret, e)
s = 0
}
}
}
var enhancers = loadEnhancers("enhancers.txt")
func getEnhancer(ctype string) (head, tail string) {
fmt.Fprintf(os.Stderr, "enhancers = %q\n", enhancers)
for _, enhancer := range enhancers {
for _, pattern := range enhancer.pattern {
matched, err := path.Match(pattern, ctype)
errcheck(err)
fmt.Fprintf(os.Stderr, "Match(%q, %q) => %q\n", pattern, ctype, matched)
if matched {
return enhancer.head, enhancer.tail
}
}
}
return "", ""
}
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