forked from josharian/impl
/
main.go
67 lines (51 loc) · 1.24 KB
/
main.go
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// impl generates method stubs for implementing an interface.
package main
import (
"flag"
"fmt"
"os"
"github.com/jonasrmichel/impl/pkg/impl"
)
const usage = `impl [-dir directory] <recv> <iface>
impl generates method stubs for recv to implement iface.
Examples:
impl 'f *File' io.Reader
impl Murmur hash.Hash
impl -dir $GOPATH/src/github.com/jonasrmichel/impl Murmur hash.Hash
Don't forget the single quotes around the receiver type
to prevent shell globbing.
`
var (
flagSrcDir = flag.String("dir", "", "package source directory, useful for vendored code")
)
func main() {
flag.Parse()
if len(flag.Args()) < 2 {
fmt.Fprint(os.Stderr, usage)
os.Exit(2)
}
recv, iface := flag.Arg(0), flag.Arg(1)
if !impl.ValidReceiver(recv) {
fatal(fmt.Sprintf("invalid receiver: %q", recv))
}
if *flagSrcDir == "" {
if dir, err := os.Getwd(); err == nil {
*flagSrcDir = dir
}
}
fns, err := impl.Funcs(iface, *flagSrcDir)
if err != nil {
fatal(err)
}
// Get list of already implemented funcs
implemented, err := impl.ImplementedFuncs(fns, recv, *flagSrcDir)
if err != nil {
fatal(err)
}
src := impl.GenStubs(recv, fns, implemented)
fmt.Print(string(src))
}
func fatal(msg interface{}) {
fmt.Fprintln(os.Stderr, msg)
os.Exit(1)
}