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scaffold.go
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/
scaffold.go
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package scaffold
import (
"bytes"
"context"
"fmt"
"io/fs"
"os"
"path/filepath"
"strings"
"text/template"
"github.com/Masterminds/sprig/v3"
"github.com/foomo/posh/pkg/log"
"github.com/foomo/posh/pkg/util/prints"
"github.com/pkg/errors"
)
type (
Scaffold struct {
l log.Logger
dry bool
override bool
directories []Directory
}
Option func(*Scaffold) error
)
// ------------------------------------------------------------------------------------------------
// ~ Options
// ------------------------------------------------------------------------------------------------
func WithDry(v bool) Option {
return func(o *Scaffold) error {
o.dry = v
return nil
}
}
func WithOverride(v bool) Option {
return func(o *Scaffold) error {
o.override = v
return nil
}
}
func WithDirectories(v ...Directory) Option {
return func(o *Scaffold) error {
o.directories = append(o.directories, v...)
return nil
}
}
// ------------------------------------------------------------------------------------------------
// ~ Constructor
// ------------------------------------------------------------------------------------------------
func New(l log.Logger, opts ...Option) (*Scaffold, error) {
inst := &Scaffold{
l: l.Named("scaffold"),
dry: false,
override: false,
}
for _, opt := range opts {
if opt != nil {
if err := opt(inst); err != nil {
return nil, err
}
}
}
return inst, nil
}
// ------------------------------------------------------------------------------------------------
// ~ Public methods
// ------------------------------------------------------------------------------------------------
func (s *Scaffold) Render(ctx context.Context) error {
if err := s.renderDirectories(); err != nil {
return err
}
return nil
}
// ------------------------------------------------------------------------------------------------
// ~ Private methods
// ------------------------------------------------------------------------------------------------
func (s *Scaffold) scaffoldDir(target string) error {
s.l.Info("mkdir:", s.filename(target))
if stat, err := os.Stat(target); errors.Is(err, os.ErrNotExist) {
if err := os.MkdirAll(target, os.ModePerm); err != nil {
return err
}
} else if err != nil {
return errors.Wrapf(err, "failed to stat target folder (%s)", target)
} else if !stat.IsDir() {
return fmt.Errorf("target not a directory (%s)", target)
}
return nil
}
func (s *Scaffold) scaffoldTemplate(target string, tpl *template.Template, data any) error {
s.l.Info("file:", s.filename(target))
file, err := os.Create(target)
if err != nil {
return errors.Wrapf(err, "failed to create target file (%s)", target)
}
defer func() {
if err := file.Close(); err != nil {
s.l.Warn("failed to close file: %s", err.Error())
}
}()
return tpl.Execute(file, data)
}
func (s *Scaffold) printTemplate(msg, target string, tpl *template.Template, data any) error {
var out bytes.Buffer
if err := tpl.Execute(&out, data); err != nil {
return err
}
prints.Code(s.l, fmt.Sprintf("%s: %s", msg, target), out.String(), filepath.Ext(target))
return nil
}
func (s *Scaffold) renderDirectories() error {
for _, directory := range s.directories {
if err := s.renderDirectory(directory); err != nil {
return err
}
}
return nil
}
func (s *Scaffold) renderDirectory(directory Directory) error {
s.l.Info("scaffolding directory:", directory.Target)
if err := s.scaffoldDir(directory.Target); err != nil {
return err
}
if err := fs.WalkDir(directory.Source, ".", func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
} else if path == "." {
return nil
} else if d.IsDir() {
return s.scaffoldDir(s.filename(path))
}
filename := s.filename(path)
tpl, err := template.New(d.Name()).Funcs(sprig.FuncMap()).ParseFS(directory.Source, path)
if err != nil {
return errors.Wrapf(err, "failed to parse source file (%s)", path)
}
if s.dry {
return s.printTemplate("file", filename, tpl, directory.Data)
} else if exists, err := s.fileExists(filename); err != nil {
return s.printTemplate(err.Error(), filename, tpl, directory.Data)
} else if exists && !s.override {
return s.printTemplate("file exists", filename, tpl, directory.Data)
} else {
return s.scaffoldTemplate(filename, tpl, directory.Data)
}
}); err != nil {
return errors.Wrapf(err, "failed to render scaffold to %s", directory.Target)
}
return nil
}
func (s *Scaffold) fileExists(target string) (bool, error) {
if stat, err := os.Stat(target); errors.Is(err, fs.ErrNotExist) {
return false, nil
} else if err != nil {
return false, errors.Wrapf(err, "failed to stat target (%s)", target)
} else if stat.IsDir() {
return true, fmt.Errorf("target file is an existing directory (%s)", target)
} else {
return true, nil
}
}
func (s *Scaffold) filename(v string) string {
v = strings.ReplaceAll(v, "$", "")
v = strings.TrimSuffix(v, ".gotext")
v = strings.TrimSuffix(v, ".gohtml")
return v
}