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package cli |
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|
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import ( |
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"fmt" |
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"os" |
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"path/filepath" |
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|
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"github.com/spf13/cobra" |
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"larc.wejust.rest/larc/internal/core" |
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"larc.wejust.rest/larc/internal/repo" |
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"larc.wejust.rest/larc/internal/status" |
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) |
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|
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func BranchJumpCmd() *cobra.Command { |
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cmd := &cobra.Command{ |
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Use: "branchjump <branch>", |
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Short: "Switch to a different branch", |
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Aliases: []string{"bj"}, |
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Args: cobra.ExactArgs(1), |
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RunE: func(cmd *cobra.Command, args []string) error { |
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wd, _ := os.Getwd() |
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repoRoot, err := repo.FindRepoRoot(wd) |
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if err != nil { |
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return fmt.Errorf("not a larc repository") |
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} |
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|
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r, err := repo.Open(repoRoot) |
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if err != nil { |
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return err |
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} |
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defer r.Close() |
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|
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branches, err := r.Meta.ListBranches() |
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if err != nil { |
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return err |
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} |
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|
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if len(branches) == 0 { |
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fmt.Println("No branches yet.") |
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return nil |
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} |
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|
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currentBranch, _ := r.CurrentBranch() |
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|
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branchName := args[0] |
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var selectedBranch *core.Branch |
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for _, b := range branches { |
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if b.Name == branchName { |
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selectedBranch = b |
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break |
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} |
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} |
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|
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if selectedBranch == nil { |
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return fmt.Errorf("branch '%s' not found", branchName) |
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} |
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|
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if selectedBranch.Name == currentBranch { |
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fmt.Printf("Already on branch %s.\n", selectedBranch.Name) |
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return nil |
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} |
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|
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fmt.Printf("Jumping to branch %s...\n", selectedBranch.Name) |
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|
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// Get the head revision of the selected branch |
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rev, err := r.Meta.GetRevision(selectedBranch.HeadRev) |
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if err != nil { |
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return fmt.Errorf("failed to get revision for branch %s: %w", selectedBranch.Name, err) |
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} |
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|
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// Get the tree for the new revision |
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tree, err := r.GetTree(rev.TreeHash) |
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if err != nil { |
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return fmt.Errorf("failed to get tree for revision r%d: %w", rev.Number, err) |
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} |
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|
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// Clean the working directory |
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// NOTE(kroot): This is a simple implementation that just removes all files. |
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// A more robust implementation would compare the files and only |
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// remove/update the ones that have changed. |
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|
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scanner := status.NewScanner(r) |
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entries, err := scanner.GetStagedEntries() |
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if err != nil { |
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return err |
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} |
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for _, entry := range entries { |
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os.Remove(filepath.Join(repoRoot, entry.Path)) |
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} |
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|
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// Checkout the new tree |
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for _, entry := range tree.Entries { |
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filePath := filepath.Join(repoRoot, entry.Path) |
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if err := os.MkdirAll(filepath.Dir(filePath), 0755); err != nil { |
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return fmt.Errorf("failed to create directory %s: %w", filepath.Dir(filePath), err) |
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} |
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data, err := r.Blobs.Read(entry.BlobHash) |
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if err != nil { |
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return fmt.Errorf("failed to read blob %s: %w", entry.BlobHash, err) |
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} |
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if err := os.WriteFile(filePath, data, os.FileMode(entry.Mode)); err != nil { |
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return fmt.Errorf("failed to write file %s: %w", filePath, err) |
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} |
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} |
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|
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// Update the current branch and revision |
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if err := r.SetCurrentBranch(selectedBranch.Name); err != nil { |
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return fmt.Errorf("failed to set current branch: %w", err) |
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} |
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if err := r.SetCurrentRevision(selectedBranch.HeadRev); err != nil { |
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return fmt.Errorf("failed to set current revision: %w", err) |
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} |
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|
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// Update the index |
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scanner.ClearStaging() |
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for _, entry := range tree.Entries { |
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scanner.Stage(entry.Path, entry.BlobHash, entry.Size) |
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} |
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if err := scanner.SaveIndex(); err != nil { |
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return fmt.Errorf("failed to save index: %w", err) |
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} |
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|
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fmt.Printf("Successfully jumped to branch %s.\n", selectedBranch.Name) |
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|
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return nil |
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}, |
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} |
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return cmd |
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} |
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|