feat(init): initial commit

cmd/shared.go

@@ -0,0 +1,109 @@
+/*
+Copyright © 2025 Lewis Wynne <lew@ily.rs>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+package cmd
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+	"unicode/utf8"
+
+	"github.com/dgraph-io/badger/v4"
+	gap "github.com/muesli/go-app-paths"
+	"golang.org/x/term"
+)
+
+type Store struct{}
+
+func (s *Store) parse(k string) ([]byte, string, error) {
+	var key, db string
+	ps := strings.Split(k, "@")
+	switch len(ps) {
+	case 1:
+		key = strings.ToLower(ps[0])
+	case 2:
+		key = strings.ToLower(ps[0])
+		db = strings.ToLower(ps[1])
+	default:
+		return nil, "", fmt.Errorf("bad key format, use KEY@DB")
+	}
+	return []byte(key), db, nil
+}
+
+func (s *Store) open(name string) (*badger.DB, error) {
+	if name == "" {
+		name = "default"
+	}
+	path, err := s.path(name)
+	if err != nil {
+		return nil, err
+	}
+	return badger.Open(badger.DefaultOptions(path).WithLoggingLevel(badger.ERROR))
+}
+
+func (s *Store) path(args ...string) (string, error) {
+	scope := gap.NewVendorScope(gap.User, "pda", "stores")
+	dir, err := scope.DataPath("")
+	if err != nil {
+		return "", err
+	}
+	if err := os.MkdirAll(dir, 0o750); err != nil {
+		return "", err
+	}
+	return filepath.Join(append([]string{dir}, args...)...), nil
+}
+
+func (s *Store) Print(pf string, vs ...[]byte) {
+	nb := "(omitted binary data)"
+	fvs := make([]any, 0)
+	tty := term.IsTerminal(int(os.Stdin.Fd()))
+	for _, v := range vs {
+		if tty && !utf8.Valid(v) {
+			fvs = append(fvs, nb)
+		} else {
+			fvs = append(fvs, string(v))
+		}
+	}
+	fmt.Printf(pf, fvs...)
+	if tty && !strings.HasSuffix(pf, "\n") {
+		fmt.Println()
+	}
+}
+
+func (s *Store) Transaction(key string, readonly bool, fn func(tx *badger.Txn, key []byte) error) error {
+	k, dbName, err := s.parse(key)
+	if err != nil {
+		return err
+	}
+	db, err := s.open(dbName)
+	if err != nil {
+		return err
+	}
+	defer db.Close()
+	tx := db.NewTransaction(!readonly)
+	if err := fn(tx, k); err != nil {
+		tx.Discard()
+		return err
+	}
+	return tx.Commit()
+}