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gen.go
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gen.go
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package main
import (
"errors"
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"path/filepath"
"github.com/jba/gen"
)
var (
genPath = flag.String("g", "", "import path of generic package")
outputDir = flag.String("o", "", "output directory (resulting package will be in a subdir of this)")
outputName = flag.String("p", "", "output package name (also subdir name)")
)
func main() {
flag.Parse()
requireFlag("g", *genPath)
requireFlag("o", *outputDir)
requireFlag("p", *outputName)
err := run(*genPath, *outputDir, *outputName, flag.Args())
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
os.Exit(1)
}
}
func requireFlag(flag, val string) {
if val == "" {
log.Fatalf("need -%s", flag)
}
}
func run(genPath, outputDir, outputName string, args []string) error {
if len(args) == 0 {
return errors.New("need bindings")
}
var params []string
bspecs := map[string]string{}
for _, arg := range args {
param, arg, err := gen.ParseBindingSpec(arg)
if err != nil {
return err
}
bspecs[param] = arg
params = append(params, param)
}
cwd, err := os.Getwd()
if err != nil {
return err
}
pkg, err := gen.Check(genPath, cwd, params)
if err != nil {
return fmt.Errorf("check failed: %v", err)
}
bindings, err := gen.NewBindingMap(bspecs)
if err != nil {
return err
}
if err := gen.Instantiate(pkg, outputName, bindings); err != nil {
return err
}
return writePackage(pkg, outputDir, outputName)
}
func writePackage(pkg *gen.Package, outputDir, outputName string) error {
if err := os.MkdirAll(outputDir, os.ModePerm); err != nil {
return err
}
tempOutDir, err := ioutil.TempDir(outputDir, "gen-")
if err != nil {
return err
}
if err := pkg.Write(tempOutDir); err != nil {
if err := os.Remove(tempOutDir); err != nil {
log.Printf("removing %s: %v", tempOutDir, err)
}
return err
}
destDir := filepath.Join(outputDir, pkg.Name())
if err := os.RemoveAll(destDir); err != nil {
return err
}
return os.Rename(tempOutDir, destDir)
}