Milestone 3

internal/commands/switch.go

@@ -0,0 +1,107 @@
+package commands
+
+import (
+	"fmt"
+	"os"
+
+	"git.dws.rip/DWS/onyx/internal/core"
+	"github.com/spf13/cobra"
+)
+
+// NewSwitchCmd creates the switch command
+func NewSwitchCmd() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "switch <name>",
+		Short: "Switch to a different workstream",
+		Long: `Switch to a different workstream.
+
+This command will:
+  1. Save the current ephemeral state (handled by the daemon)
+  2. Load the target workstream
+  3. Checkout the latest commit in the target workstream
+  4. Update the current workstream pointer
+  5. Restore the workspace state
+
+The operation is logged to the action log, so you can undo it if needed.`,
+		Args: cobra.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return runSwitch(args[0])
+		},
+	}
+
+	return cmd
+}
+
+// runSwitch executes the switch command
+func runSwitch(name string) error {
+	// Get current directory
+	cwd, err := os.Getwd()
+	if err != nil {
+		return fmt.Errorf("failed to get current directory: %w", err)
+	}
+
+	// Check if this is an Onyx repository
+	if !core.IsOnyxRepo(cwd) {
+		return fmt.Errorf("not an Onyx repository")
+	}
+
+	// Open the repository
+	repo, err := core.Open(cwd)
+	if err != nil {
+		return fmt.Errorf("failed to open repository: %w", err)
+	}
+	defer repo.Close()
+
+	// Create workstream manager
+	wsManager := core.NewWorkstreamManager(repo)
+
+	// Get current workstream name before switching
+	currentName, err := wsManager.GetCurrentWorkstreamName()
+	if err != nil {
+		currentName = "none"
+	}
+
+	// Check if we're already on the target workstream
+	if currentName == name {
+		fmt.Printf("Already on workstream '%s'\n", name)
+		return nil
+	}
+
+	// Use ExecuteWithTransaction to capture state_before and state_after
+	err = core.ExecuteWithTransaction(repo, "switch", fmt.Sprintf("Switched from '%s' to '%s'", currentName, name), func() error {
+		return wsManager.SwitchWorkstream(name)
+	})
+
+	if err != nil {
+		return err
+	}
+
+	// Get the workstream we just switched to
+	targetWorkstream, err := wsManager.GetCurrentWorkstream()
+	if err != nil {
+		return fmt.Errorf("failed to get workstream after switch: %w", err)
+	}
+
+	// Display success message
+	fmt.Printf("Switched to workstream '%s'\n", name)
+
+	// Show workstream info
+	commitCount := targetWorkstream.GetCommitCount()
+	if commitCount == 0 {
+		fmt.Printf("\nThis is a new workstream based on '%s' with no commits yet.\n", targetWorkstream.BaseBranch)
+		fmt.Printf("Make changes and save them with 'onx save -m \"message\"'\n")
+	} else {
+		commitText := "commit"
+		if commitCount != 1 {
+			commitText = "commits"
+		}
+		fmt.Printf("\nThis workstream has %d %s.\n", commitCount, commitText)
+
+		// Show the latest commit
+		if latestCommit, err := targetWorkstream.GetLatestCommit(); err == nil {
+			fmt.Printf("Latest commit: %s\n", latestCommit.Message)
+		}
+	}
+
+	return nil
+}