Partial store/restore functionality implemented

main.go

@@ -67,12 +67,25 @@ func main() {
 
 		cmd := strings.TrimSpace(string(buf[:n]))
 		switch(cmd) {
+		case "store workspaces":
+			err = session.StoreWorkspaces()
+			if err != nil {
+				fmt.Printf("Store workspaces: %s\n", err)
+			}
+			conn.Close()
+
+		case "restore workspaces":
+			err = session.RestoreWorkspaces()
+			if err != nil {
+				fmt.Printf("Restore workspaces: %s\n", err)
+			}
+			conn.Close()
+
 		case "fix workspaces":
 			err = session.FixWorkspaces()
 			if err != nil {
 				fmt.Printf("Fix workspaces: %s\n", err)
 			}
-
 			conn.Close()
 		}
 	}

session.go

@@ -85,14 +85,10 @@ func (sess I3Session) Workspaces() (workspaces []I3Workspace, err error) {
 }
 
 // Subscribe subscribes to events.
-func (sess I3Session) Subscribe(events []string) error {
+func (sess I3Session) Subscribe(events []string) (err error) {
 	eventsJSON, _ := json.Marshal(events)
-	res, err := sess.Socket.Request(SUBSCRIBE, string(eventsJSON))
-	if err != nil {
-		return err
-	}
-	fmt.Printf("Subscribe: %s\n", res)
-	return nil
+	_, err = sess.Socket.Request(SUBSCRIBE, string(eventsJSON))
+	return
 }
 
 // Config returns the currently running configuration data, as
@@ -299,6 +295,44 @@ func (sess I3Session) MarkMove() error {
 	return nil
 }
 
+// StoreWorkspaces stores the output of each workspace.
+func (sess *I3Session) StoreWorkspaces() (err error) {
+	var workspaces []I3Workspace
+
+	sess.workspaces = make(map[int]string)
+	workspaces, err = sess.Workspaces()
+	if err != nil {
+		return
+	}
+
+	for _, ws := range workspaces {
+		sess.workspaces[ws.Id] = ws.Output
+	}
+	return
+}
+
+// RestoreWorkspaces moves the workspace back to its stored place, if possible.
+func (sess *I3Session) RestoreWorkspaces() (err error) {
+	err = sess.UpdateOutputIndices()
+	if err != nil {
+		return err
+	}
+
+	for wsId, output := range sess.workspaces {
+		cmd := fmt.Sprintf(
+			"[workspace=%d] move workspace to output %s",
+			wsId,
+			output,
+		)
+		res, err := sess.Socket.Request(RUN_COMMAND, cmd)
+		if err != nil {
+			return err
+		}
+		fmt.Printf("%s\n", res)
+	}
+	return
+}
+
 // FixWorkspaces moves windows from workspaces on the wrong monitor to
 // to workspaces on the correct monitor. For fixing when going to less
 // outputs.

types.go

@@ -8,6 +8,9 @@ import (
 type I3Session struct {
 	Socket I3Socket
 	filename string
+
+	// workspace ID → output name
+	workspaces map[int]string
 }
 
 type I3Socket struct {