main.go

//
// Copyright (C) 2019-2023 vdaas.org vald team <vald@vdaas.org>
//
// 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
//
//    https://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 (
	"bufio"
	"bytes"
	"fmt"
	"io/fs"
	"os"
	"path/filepath"
	"sync"
	"text/template"
	"time"

	"github.com/vdaas/vald/internal/errors"
	"github.com/vdaas/vald/internal/file"
	"github.com/vdaas/vald/internal/log"
	"github.com/vdaas/vald/internal/strings"
)

var (
	apache = template.Must(template.New("Apache License").Parse(`{{.Escape}}
{{.Escape}} Copyright (C) 2019-{{.Year}} {{.Maintainer}}
{{.Escape}}
{{.Escape}} Licensed under the Apache License, Version 2.0 (the "License");
{{.Escape}} you may not use this file except in compliance with the License.
{{.Escape}} You may obtain a copy of the License at
{{.Escape}}
{{.Escape}}    https://www.apache.org/licenses/LICENSE-2.0
{{.Escape}}
{{.Escape}} Unless required by applicable law or agreed to in writing, software
{{.Escape}} distributed under the License is distributed on an "AS IS" BASIS,
{{.Escape}} WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
{{.Escape}} See the License for the specific language governing permissions and
{{.Escape}} limitations under the License.
{{.Escape}}
`))
	slushEscape = "//"
	sharpEscape = "#"
)

type Data struct {
	Escape     string
	Maintainer string
	Year       int
}

const (
	minimumArgumentLength = 2
	defaultMaintainer     = "vdaas.org vald team <vald@vdaas.org>"
	maintainerKey         = "MAINTAINER"
)

func main() {
	log.Init()
	if len(os.Args) < minimumArgumentLength {
		// skipcq: RVV-A0003
		log.Fatal(errors.New("invalid argument"))
	}
	for _, path := range dirwalk(os.Args[1]) {
		fmt.Println(path)
		err := readAndRewrite(path)
		if err != nil {
			// skipcq: RVV-A0003
			log.Fatal(err)
		}
	}
}

func dirwalk(dir string) []string {
	files, err := file.ReadDir(dir)
	if err != nil {
		panic(err)
	}
	var paths []string
	for _, f := range files {
		if f.IsDir() {
			if !strings.Contains(f.Name(), "vendor") &&
				!strings.Contains(f.Name(), "versions") &&
				!strings.Contains(f.Name(), ".git") ||
				strings.HasPrefix(f.Name(), ".github") {
				paths = append(paths, dirwalk(file.Join(dir, f.Name()))...)
			}
			continue
		}
		switch filepath.Ext(f.Name()) {
		case
			".ai",
			".all-contributorsrc",
			".cfg",
			".crt",
			".default",
			".drawio",
			".git",
			".gitignore",
			".gitkeep",
			".gitmodules",
			".gotmpl",
			".hdf5",
			".helmignore",
			".html",
			".json",
			".key",
			".kvsdb",
			".lock",
			".md",
			".md5",
			".mod",
			".pdf",
			".pem",
			".png",
			".ssv",
			".sum",
			".svg",
			".tmpl",
			".tpl",
			".txt",
			".webp",
			".whitesource",
			"LICENSE",
			"Pipefile":
		default:
			switch f.Name() {
			case
				"AUTHORS",
				"CONTRIBUTORS",
				"GO_VERSION",
				"NGT_VERSION",
				"Pipefile",
				"VALD_VERSION",
				"grp",
				"obj",
				"prf",
				"src",
				"tre":
			default:
				path := file.Join(dir, f.Name())
				log.Info(path)
				paths = append(paths, path)
			}
		}
	}
	return paths
}

func readAndRewrite(path string) error {
	f, err := os.OpenFile(path, os.O_RDWR|os.O_SYNC, fs.ModePerm)
	if err != nil {
		return errors.Errorf("filepath %s, could not open", path)
	}
	fi, err := f.Stat()
	if err != nil {
		err = f.Close()
		if err != nil {
			// skipcq: RVV-A0003
			log.Fatal(err)
		}
		return errors.Errorf("filepath %s, could not open", path)
	}
	buf := bytes.NewBuffer(make([]byte, 0, fi.Size()))
	maintainer := os.Getenv(maintainerKey)
	if len(maintainer) == 0 {
		maintainer = defaultMaintainer
	}
	d := Data{
		Maintainer: maintainer,
		Year:       time.Now().Year(),
		Escape:     sharpEscape,
	}
	if fi.Name() == "LICENSE" {
		err = license.Execute(buf, d)
		if err != nil {
			// skipcq: RVV-A0003
			log.Fatal(err)
		}
	} else {
		switch filepath.Ext(path) {
		case ".go", ".proto":
			d.Escape = slushEscape
		}
		lf := true
		bf := false
		sc := bufio.NewScanner(f)
		once := sync.Once{}
		for sc.Scan() {
			line := sc.Text()
			if filepath.Ext(path) == ".go" && strings.HasPrefix(line, "//go:") ||
				filepath.Ext(path) == ".py" && strings.HasPrefix(line, "# -*-") {
				bf = true
				_, err = buf.WriteString(line)
				if err != nil {
					// skipcq: RVV-A0003
					log.Fatal(err)
				}
				_, err = buf.WriteString("\n")
				if err != nil {
					// skipcq: RVV-A0003
					log.Fatal(err)
				}
				_, err = buf.WriteString("\n")
				if err != nil {
					// skipcq: RVV-A0003
					log.Fatal(err)
				}
				continue
			}
			if (filepath.Ext(path) == ".yaml" || filepath.Ext(path) == ".yml") && strings.HasPrefix(line, "---") {
				_, err = buf.WriteString(line)
				if err != nil {
					// skipcq: RVV-A0003
					log.Fatal(err)
				}
				_, err = buf.WriteString("\n")
				if err != nil {
					// skipcq: RVV-A0003
					log.Fatal(err)
				}
				continue
			}
			if lf && strings.HasPrefix(line, d.Escape) {
				continue
			} else if !bf {
				once.Do(func() {
					err = apache.Execute(buf, d)
					if err != nil {
						// skipcq: RVV-A0003
						log.Fatal(err)
					}
				})
				lf = false
			}
			if !lf {
				_, err = buf.WriteString(line)
				if err != nil {
					// skipcq: RVV-A0003
					log.Fatal(err)
				}
				_, err = buf.WriteString("\n")
				if err != nil {
					// skipcq: RVV-A0003
					log.Fatal(err)
				}
			}
			bf = false
		}
	}
	err = f.Close()
	if err != nil {
		return errors.Errorf("filepath %s, could not close", path)
	}
	err = os.RemoveAll(path)
	if err != nil {
		return errors.Errorf("filepath %s, could not delete", path)
	}
	f, err = os.Create(path)
	if err != nil {
		err = f.Close()
		if err != nil {
			// skipcq: RVV-A0003
			log.Fatal(err)
		}
		return errors.Errorf("filepath %s, could not open", path)
	}
	_, err = f.WriteString(strings.ReplaceAll(buf.String(), d.Escape+"\n\n\n", d.Escape+"\n\n"))
	if err != nil {
		// skipcq: RVV-A0003
		log.Fatal(err)
	}
	err = f.Close()
	if err != nil {
		// skipcq: RVV-A0003
		log.Fatal(err)
	}
	return nil
}

var license = template.Must(template.New("LICENSE").Parse(
	`                                 Apache License
                           Version 2.0, January 2004
                        https://www.apache.org/licenses/

   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

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      names, trademarks, service marks, or product names of the Licensor,
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   7. Disclaimer of Warranty. Unless required by applicable law or
      agreed to in writing, Licensor provides the Work (and each
      Contributor provides its Contributions) on an "AS IS" BASIS,
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      whether in tort (including negligence), contract, or otherwise,
      unless required by applicable law (such as deliberate and grossly
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   END OF TERMS AND CONDITIONS

   APPENDIX: How to apply the Apache License to your work.

      To apply the Apache License to your work, attach the following
      boilerplate notice, with the fields enclosed by brackets "[]"
      replaced with your own identifying information. (Don't include
      the brackets!)  The text should be enclosed in the appropriate
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   Copyright (C) 2019-{{.Year}} {{.Maintainer}}

   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

       https://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.
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