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package main
import (
"context"
"fmt"
"log"
"os"
"strings"
"github.com/urfave/cli/v3"
"go.etcd.io/bbolt"
)
type controller struct {
db *bbolt.DB
tasksBucketName []byte
}
func newController(filename string) (controller, error) {
db, err := bbolt.Open(filename, 0644, nil)
if err != nil {
return controller{}, fmt.Errorf("can't open database file '%s': %w", filename, err)
}
tasksBucketName := []byte("tasks")
// Create the tasks bucket for the first time. From here on,
// all transactions can assume this bucket exists.
db.Update(func(tx *bbolt.Tx) error {
_, err := tx.CreateBucket(tasksBucketName)
if err != nil {
return fmt.Errorf("cant' create tasks bucket: %w", err)
}
return nil
})
return controller{db, tasksBucketName}, nil
}
func main() {
ctrl, err := newController("tasks.db")
if err != nil {
log.Fatal(err)
}
cmd := &cli.Command{
Commands: []*cli.Command{
{
Name: "add",
Aliases: []string{"a"},
Usage: "add a task to the list",
Action: func(ctx context.Context, cmd *cli.Command) error {
args := cmd.Args().Slice()
task := strings.Join(args, " ")
return ctrl.cmdAdd(task)
},
},
{
Name: "do",
Aliases: []string{"d"},
Usage: "complete a task on the list",
Arguments: []cli.Argument{
&cli.IntArg{
Name: "taskIndex",
},
},
Action: func(ctx context.Context, cmd *cli.Command) error {
taskIndex := cmd.IntArg("taskIndex")
// If taskIndex is 0, it's
// likely missing; any other
// non-positive value is a
// deliberate
// misconfiguration.
if taskIndex <= 0 {
return fmt.Errorf("invalid 'do' argument: %d", taskIndex)
}
return ctrl.cmdDo(taskIndex)
},
},
{
Name: "undo",
Aliases: []string{"u"},
Usage: "reset a task on the list",
Arguments: []cli.Argument{
&cli.IntArg{
Name: "taskIndex",
},
},
Action: func(ctx context.Context, cmd *cli.Command) error {
taskIndex := cmd.IntArg("taskIndex")
if taskIndex <= 0 {
return fmt.Errorf("invalid 'undo' argument: %d", taskIndex)
}
return ctrl.cmdUndo(taskIndex)
},
},
{
Name: "list",
Aliases: []string{"l"},
Usage: "list pending tasks",
Action: func(ctx context.Context, cmd *cli.Command) error {
return ctrl.cmdList()
},
},
},
}
if err := cmd.Run(context.Background(), os.Args); err != nil {
log.Fatal(err)
}
}
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