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main.go
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main.go
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// Copyright 2021 Muvaffak Onus
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"bytes"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
"github.com/alecthomas/kong"
"github.com/pkg/errors"
"github.com/muvaf/typewriter/pkg/cmd"
"github.com/muvaf/typewriter/pkg/packages"
"github.com/muvaf/typewriter/pkg/wrapper"
)
type typeWriterCLI struct {
PackagePath string `help:"Path to package dir to scan" type:"path" required:""`
TargetPackagePath string `help:"Package to write the generated files. If not given, package path will be used." type:"path"`
DisableLinter bool `help:"Option to disable linting the output. Useful for debugging errors."`
}
func main() {
cli := &typeWriterCLI{}
ctx := kong.Parse(cli)
targetPackagePath := cli.TargetPackagePath
if targetPackagePath == "" {
targetPackagePath = cli.PackagePath
}
ctx.FatalIfErrorf(PrintProducers(cli.PackagePath, cli.TargetPackagePath, cli.DisableLinter), "cannot print producers")
}
func PrintProducers(pkgPath, targetPkgPath string, disableLinter bool) error {
c := packages.NewCache()
targetPkgName := targetPkgPath[strings.LastIndex(targetPkgPath, "/")+1:]
tmplPath := "/Users/monus/go/src/github.com/muvaf/typewriter/internal/templates/producers.go.tmpl"
headerPath := "/Users/monus/go/src/github.com/muvaf/typewriter/internal/header.txt"
file := wrapper.NewFile(targetPkgPath, targetPkgName, tmplPath,
wrapper.WithHeaderPath(headerPath),
)
vars := map[string]interface{}{}
f := cmd.NewFunctions(c, file.Imports, pkgPath,
cmd.WithNewFuncGeneratorFns(cmd.NewProducers))
fns, err := f.Run()
if err != nil {
return err
}
for k, v := range fns {
vars[k] = v
}
final, err := file.Wrap(vars)
if err != nil {
return err
}
if !disableLinter {
fb := bytes.NewBuffer(final)
command := exec.Command("goimports")
command.Stdin = fb
outb := &bytes.Buffer{}
command.Stdout = outb
if err := command.Run(); err != nil {
return errors.Wrap(err, "goimports failed")
}
final = outb.Bytes()
}
if err := os.MkdirAll(targetPkgPath, os.ModePerm); err != nil {
return errors.Wrapf(err, "cannot create target package directory %s", targetPkgPath)
}
return errors.Wrap(ioutil.WriteFile(filepath.Join(targetPkgPath, "producers.go"), final, os.ModePerm), "cannot write to target file path")
}