Add --output=json support to put command

README.md

@@ -145,14 +145,15 @@ $ dbxcli search --output=json report /Reports
 $ dbxcli revs --output=json /Reports/old.pdf
 $ dbxcli cp --output=json /Reports/old.pdf /Reports/copy.pdf
 $ dbxcli mv --output=json /Reports/copy.pdf /Reports/archive/copy.pdf
+$ dbxcli put --output=json README.md /README.md
 $ dbxcli share-link create --output=json /Reports/old.pdf
 $ dbxcli share-link list --output=json /Reports/old.pdf
 $ dbxcli mkdir --output=json /new-folder
 $ dbxcli rm --output=json /old-file.txt
 $ dbxcli restore --output=json /Reports/old.pdf 015f...
 ```
 
-Structured success output is rolling out command by command. Currently migrated commands are `account`, `du`, `ls`, `search`, `revs`, `cp`, `mv`, `share-link create`, `share-link list`, `share-link info`, `share-link update`, `share-link revoke`, `share-link download`, `mkdir`, `rm`, and `restore`. Commands that have not been migrated return a JSON error whose `error.message` is `structured output is not supported for this command yet` when used with `--output=json`.
+Structured success output is rolling out command by command. Currently migrated commands are `account`, `du`, `ls`, `search`, `revs`, `cp`, `mv`, `put`, `share-link create`, `share-link list`, `share-link info`, `share-link update`, `share-link revoke`, `share-link download`, `mkdir`, `rm`, and `restore`. Commands that have not been migrated return a JSON error whose `error.message` is `structured output is not supported for this command yet` when used with `--output=json`.
 
 Command results are written to stdout. Status, progress, warnings, diagnostics, and verbose logs are written to stderr.
 
@@ -221,6 +222,38 @@ For commands such as `rm`, `input` uses command-specific path and flag fields:
 }
 ```
 
+`put` always returns a `results` array, including single-file and stdin uploads. The top-level `input` describes the command request; each result reports whether a file was `uploaded`, `skipped`, or a directory was `created` or already `existing`:
+
+```json
+{
+  "input": {
+    "source": "README.md",
+    "target": "/README.md",
+    "recursive": false,
+    "if_exists": "overwrite",
+    "stdin": false
+  },
+  "results": [
+    {
+      "status": "uploaded",
+      "kind": "file",
+      "input": {
+        "source": "README.md",
+        "target": "/README.md"
+      },
+      "result": {
+        "type": "file",
+        "path_display": "/README.md",
+        "path_lower": "/readme.md",
+        "id": "id:...",
+        "rev": "...",
+        "size": 123
+      }
+    }
+  ]
+}
+```
+
 Commands that return entry lists, such as `ls`, `search`, and `revs`, return an `input` object and an `entries` array. `ls` input includes the listed path; `search` input includes the query and optional path scope; `revs` input includes the file path:
 
 ```json

cmd/json_metadata.go

@@ -21,6 +21,9 @@ type jsonMetadata struct {
 func jsonMetadataFromDropbox(metadata files.IsMetadata) jsonMetadata {
 	switch m := metadata.(type) {
 	case *files.FileMetadata:
+		if m == nil {
+			return jsonMetadata{Type: "unknown"}
+		}
 		size := m.Size
 		return jsonMetadata{
 			Type:           "file",
@@ -33,13 +36,19 @@ func jsonMetadataFromDropbox(metadata files.IsMetadata) jsonMetadata {
 			ClientModified: jsonTime(m.ClientModified),
 		}
 	case *files.FolderMetadata:
+		if m == nil {
+			return jsonMetadata{Type: "unknown"}
+		}
 		return jsonMetadata{
 			Type:        "folder",
 			PathDisplay: m.PathDisplay,
 			PathLower:   m.PathLower,
 			ID:          m.Id,
 		}
 	case *files.DeletedMetadata:
+		if m == nil {
+			return jsonMetadata{Type: "unknown"}
+		}
 		return jsonMetadata{
 			Type:        "deleted",
 			PathDisplay: m.PathDisplay,