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item.go
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item.go
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/*
* Copyright (c) 2023 Mikhail Knyazhev <markus621@gmail.com>. All rights reserved.
* Use of this source code is governed by a BSD-3-Clause license that can be found in the LICENSE file.
*/
package tmpl
import (
"bytes"
"fmt"
"os"
"text/template"
"go.arwos.org/loopy/internal/pkg/cachekeys"
"go.osspkg.com/goppy/iosync"
)
type (
Item struct {
src string
dst string
mt int64
tmpl *template.Template
state iosync.Switch
}
Action interface {
Query(key string)
Keys() cachekeys.MapGetter
}
State interface {
IsPrepared() bool
}
)
func NewItem(in, out string, a Action) (*Item, error) {
fi, err := os.Lstat(in)
if err != nil {
return nil, fmt.Errorf("get file info %s: %w", in, err)
}
b, err := os.ReadFile(in)
if err != nil {
return nil, fmt.Errorf("read %s: %w", in, err)
}
obj := &Item{
src: in,
dst: out,
mt: fi.ModTime().Unix(),
state: iosync.NewSwitch(),
}
obj.tmpl, err = template.New("_").Funcs(TemplateFuncMap(a, obj)).Parse(string(b))
if err != nil {
return nil, fmt.Errorf("parse %s: %w", in, err)
}
return obj, nil
}
func (v *Item) IsChanged() bool {
fi, err := os.Lstat(v.src)
if err != nil {
return false
}
return v.mt < fi.ModTime().Unix()
}
func (v *Item) IsPrepared() bool {
return v.state.IsOn()
}
func (v *Item) Prepare() error {
var buf bytes.Buffer
err := v.tmpl.Execute(&buf, nil)
if err != nil {
return fmt.Errorf("execute %s: %w", v.src, err)
}
v.state.On()
return nil
}
func (v *Item) Update() error {
if v.state.IsOff() {
return fmt.Errorf("template is not prepared: %s", v.src)
}
var buf bytes.Buffer
err := v.tmpl.Execute(&buf, nil)
if err != nil {
return fmt.Errorf("execute %s: %w", v.src, err)
}
err = os.WriteFile(v.dst, buf.Bytes(), 0755)
if err != nil {
return fmt.Errorf("write %s: %w", v.dst, err)
}
return nil
}