Feature request: include `thumbnailLink` in `drive ls` and `drive get` output

[gtapps]

Context

When building automation that lists Drive files and presents them to users (e.g., in a chat interface), it's useful to show a small preview without downloading the full file. The Google Drive API v3 supports a thumbnailLink field on file resources — a short-lived URL pointing to a small thumbnail image.

Current behavior

gog drive ls --json and gog drive get <fileId> --json return a fixed set of fields:

{
  "id": "...",
  "name": "...",
  "mimeType": "image/png",
  "modifiedTime": "...",
  "size": "1780402",
  "parents": ["..."],
  "webViewLink": "..."
}

thumbnailLink (and hasThumbnail) are not included, even though the Drive API v3 supports them via the fields parameter.

Using --select "thumbnailLink" returns {} because --select filters client-side from what's already in the response — it can't request additional fields from the API.

Requested behavior

Option A (minimal): Add thumbnailLink and hasThumbnail to the default fields requested from the Drive API in drive ls and drive get.

Option B (flexible): Support a --fields flag that maps to the Drive API fields parameter, allowing users to request any file resource field. For example:

gog drive ls --parent <folderId> --json --fields "id,name,thumbnailLink"
gog drive get <fileId> --json --fields "id,name,thumbnailLink,imageMediaMetadata"

Option B would also cover other useful fields like imageMediaMetadata (width, height, rotation), videoMediaMetadata, contentHints, etc.

Use case

I'm automating content suggestions from a Drive folder — listing files and sending previews to Discord. Currently I have to gog drive download each full image (~1-3 MB) just to show a preview. With thumbnailLink, I could embed the URL directly or fetch a ~10-50 KB thumbnail instead.

References

• Drive API v3 Files resource — thumbnailLink, hasThumbnail fields
• Files.list fields parameter

Environment

• gog v0.12.0 (c18c58c)
• Linux

[steipete]

Fixed on main in 7429f6f.

drive ls, drive search, and drive get now request hasThumbnail and thumbnailLink in their default Drive file field masks, so JSON output includes those fields when the API returns them. Added regression coverage for both list and get JSON paths. Local make ci passed before push.