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package main
import (
"encoding/binary"
"encoding/json"
"fmt"
"go.etcd.io/bbolt"
)
type taskType struct {
What string `json:"what"`
Done bool `json:"done"`
Index uint64 `json:"index"`
}
// itob returns an 8-byte big endian representation of v.
func itob(v uint64) []byte {
b := make([]byte, 8)
binary.BigEndian.PutUint64(b, v)
return b
}
func (ctrl controller) cmdAdd(task string) error {
return ctrl.db.Update(func(tx *bbolt.Tx) error {
taskBucket := tx.Bucket(ctrl.tasksBucketName)
// Update call, so ignore the error check. See
// pkg.go.dev/go.etcd.io/bbolt#section-readme
index, _ := taskBucket.NextSequence()
t := taskType{
What: task,
Done: false,
Index: index,
}
buf, err := json.Marshal(t)
if err != nil {
return fmt.Errorf("can't marshal: %w", err)
}
return taskBucket.Put(itob(index), buf)
})
}
func (ctrl controller) cmdDo(taskIndex int) error {
return ctrl.db.Update(func(tx *bbolt.Tx) error {
taskBucket := tx.Bucket(ctrl.tasksBucketName)
ttBytes := taskBucket.Get(itob(uint64(taskIndex)))
var tt taskType
if err := json.Unmarshal(ttBytes, &tt); err != nil {
return fmt.Errorf("can't unmarshal: %w", err)
}
tt.Done = true
buf, err := json.Marshal(tt)
if err != nil {
return fmt.Errorf("can't marshal: %w", err)
}
return taskBucket.Put(itob(uint64(taskIndex)), buf)
})
}
func (ctrl controller) cmdList() error {
return ctrl.db.View(func(tx *bbolt.Tx) error {
// Assume bucket exists and has keys
b := tx.Bucket([]byte(ctrl.tasksBucketName))
b.ForEach(func(k, v []byte) error {
index := binary.BigEndian.Uint64(k)
fmt.Printf("%d. %s\n", index, v)
return nil
})
return nil
})
}
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