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Exports (Drive-backed)

Goal: one implementation for “export Google Thing via Drive”.

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Current pattern

• Shared builder: internal/cmd/export_via_drive.go:newExportViaDriveCmd
• Shared download: internal/cmd/drive.go:downloadDriveFile (handles Drive “native” exports + normal files)

Each service command is a thin wrapper:

• gog docs export <docId> --format pdf|docx|txt|md|html
• gog slides export <presentationId> --format pdf|pptx
• gog sheets export <spreadsheetId> --format pdf|xlsx|csv

Exception: gog docs export --tab <title-or-id> exports a single Google Docs tab through the undocumented Docs web export endpoint because Drive files.export only exports the whole document. Keep it marked experimental, preserve --out - raw-byte semantics, and reject auth redirects to Google sign-in hosts before writing bytes.

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Conventions

• Arg is always the Drive file id (Doc/Sheet/Slides id).
• Type guard: compare mimeType and error with file is not a <KindLabel> (mimeType="...").
• --out defaults to $(os.UserConfigDir())/gogcli/drive-downloads/ (via internal/config:EnsureDriveDownloadsDir).
• --out can be dir or explicit file path (via internal/cmd/drive_download_helpers.go:resolveDriveDownloadDestPath).
• --out - writes export bytes to stdout; JSON mode rejects it to avoid mixing metadata with bytes.
• Output
  • --json: { "path": "...", "size": <bytes> }
  • text: path\t... / size\t...
  • --out -: raw bytes only, no path/size status on stdout

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Add a new export command

1. Pick expected Drive mime type + allowed formats.
2. Add a new newXExportCmd calling newExportViaDriveCmd(...).
3. Add/extend tests in internal/cmd/execute_drive_*_test.go style (fake Drive server).