/
file.go
172 lines (148 loc) · 3.81 KB
/
file.go
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package write_strategy
import (
"bytes"
"fmt"
"go/format"
"io/ioutil"
"os"
"path"
"path/filepath"
lg "github.com/devimteam/microgen/logger"
)
const (
MkdirPermissions = 0777
// This hack needs for normal code formatting.
// It makes formatter think, that declared code is top-level.
// Without this hack formatter adds separators (tabs) to beginning of every line.
formatTrick = "package T\n"
NewFileMark = "New"
AppendFileMark = "Add"
)
type createFileStrategy struct {
absPath string
relPath string
formatOn bool
}
func (s createFileStrategy) Write(renderer Renderer) error {
outpath, err := filepath.Abs(filepath.Join(s.absPath, s.relPath))
if err != nil {
return fmt.Errorf("unable to resolve path: %v", err)
}
dir := path.Dir(outpath)
_, err = os.Stat(dir)
if os.IsNotExist(err) {
err = os.MkdirAll(dir, MkdirPermissions)
if err != nil {
return fmt.Errorf("unable to create directory %s: %v", outpath, err)
}
} else if err != nil {
return fmt.Errorf("could not stat file: %v", err)
}
err = s.Save(renderer, outpath)
if err != nil {
return fmt.Errorf("error when save file: %v", err)
}
return nil
}
// Copied from original github.com/dave/jennifer/jen.go func Save()
func (s createFileStrategy) Save(f Renderer, filename string) error {
buf := &bytes.Buffer{}
if err := f.Render(buf); err != nil {
return err
}
// Stop saving because nothing to save
if len(buf.Bytes()) == 0 {
return nil
}
var err error
formatted := buf.Bytes()
if s.formatOn {
formatted, err = format.Source(formatted)
if err != nil {
fmt.Println(buf.String())
return fmt.Errorf("error when format source: %v", err)
}
}
if err := ioutil.WriteFile(filename, formatted, 0644); err != nil {
return err
}
lg.Logger.Logln(2, NewFileMark, filepath.Join(s.absPath, s.relPath))
return nil
}
func NewCreateFileStrategy(absPath, relPath string) Strategy {
return createFileStrategy{
absPath: absPath,
relPath: relPath,
formatOn: true,
}
}
func NewCreateRawFileStrategy(absPath, relPath string) Strategy {
return createFileStrategy{
absPath: absPath,
relPath: relPath,
formatOn: false,
}
}
type appendFileStrategy struct {
absPath string
relPath string
}
func NewAppendToFileStrategy(absPath, relPath string) Strategy {
return appendFileStrategy{
absPath: absPath,
relPath: relPath,
}
}
func (s appendFileStrategy) Write(renderer Renderer) error {
outpath, err := filepath.Abs(filepath.Join(s.absPath, s.relPath))
if err != nil {
return fmt.Errorf("unable to resolve path: %v", err)
}
dir := path.Dir(outpath)
_, err = os.Stat(dir)
if os.IsNotExist(err) {
err = os.MkdirAll(dir, MkdirPermissions)
if err != nil {
return fmt.Errorf("unable to create directory %s: %v", outpath, err)
}
} else if err != nil {
return fmt.Errorf("could not stat file: %v", err)
}
if _, err = os.Stat(outpath); os.IsNotExist(err) {
f, err := os.Create(outpath)
if err != nil {
return fmt.Errorf("can't create %s: error: %v", outpath, err)
}
f.Close()
}
err = s.Save(renderer, outpath)
if err != nil {
return fmt.Errorf("error when save file: %v", err)
}
return nil
}
func (s appendFileStrategy) Save(renderer Renderer, filename string) error {
buf := &bytes.Buffer{}
if err := renderer.Render(buf); err != nil {
return err
}
// Stop saving because nothing
if len(buf.Bytes()) == 0 {
return nil
}
// Use trick for top-level formatting.
formatted, err := format.Source(append([]byte(formatTrick), buf.Bytes()...))
if err != nil {
fmt.Println(buf.String())
return fmt.Errorf("error when format source: %v", err)
}
f, err := os.OpenFile(filename, os.O_APPEND|os.O_WRONLY, 0644)
if err != nil {
return err
}
if _, err = f.Write(formatted[len(formatTrick):]); err != nil {
return err
}
lg.Logger.Logln(2, AppendFileMark, filepath.Join(s.absPath, s.relPath))
return nil
}