backstack: added saving of backstack to workspace

internal/common/workspaces/manager.go

@@ -0,0 +1,37 @@
+package workspaces
+
+import (
+	"github.com/asdine/storm"
+	"github.com/pkg/errors"
+	"os"
+)
+
+type MetaInfo struct {
+	Command string
+}
+
+type Manager struct {
+	metainfo MetaInfo
+}
+
+func New(metaInfo MetaInfo) *Manager {
+	return &Manager{metainfo: metaInfo}
+}
+
+func (m *Manager) Open(filename string) (*Workspace, error) {
+	db, err := storm.Open(filename)
+	if err != nil {
+		return nil, errors.Wrapf(err, "cannot open workspace at %v", filename)
+	}
+	return &Workspace{db: db}, nil
+}
+
+func (m *Manager) CreateTemp() (*Workspace, error) {
+	workspaceFile, err := os.CreateTemp("", m.metainfo.Command+"*.workspace")
+	if err != nil {
+		return nil, errors.Wrapf(err, "cannot create workspace file")
+	}
+	workspaceFile.Close() // We just need the filename
+
+	return m.Open(workspaceFile.Name())
+}

internal/common/workspaces/workspaces.go

@@ -0,0 +1,19 @@
+package workspaces
+
+import (
+	"github.com/asdine/storm"
+	"log"
+)
+
+type Workspace struct {
+	db *storm.DB
+}
+
+func (ws *Workspace) DB() *storm.DB {
+	return ws.db
+}
+
+func (ws *Workspace) Close() {
+	log.Printf("close workspace")
+	ws.db.Close()
+}