docs: Make upload-custom-emoji use curl example system.

templates/zerver/api/upload-custom-emoji.md

@@ -16,11 +16,7 @@ organization.  Access to this endpoint depends on the
 
 {tab|curl}
 
-``` curl
+{generate_code_example(curl)|/realm/emoji/{emoji_name}:post|example}
-curl -X POST {{ api_url }}/v1/realm/emoji/{emoji_name} \
-    -F "data=@/path/to/img.png" \
-    -u USER_EMAIL:API_KEY
-```
 
 {end_tabs}
 

zerver/lib/bugdown/api_code_examples.py

@@ -188,6 +188,11 @@ def generate_curl_example(endpoint: str, method: str,
                                                                   curl_argument=True)
         lines.append(example_value)
 
+    if "requestBody" in openapi_entry:
+        properties = openapi_entry["requestBody"]["content"]["multipart/form-data"]["schema"]["properties"]
+        for key, property in properties.items():
+            lines.append('    -F "{}=@{}"'.format(key, property["example"]))
+
     for i in range(1, len(lines)-1):
         lines[i] = lines[i] + " \\"
 

zerver/openapi/test_curl_examples.py

@@ -35,6 +35,8 @@ exclude_list = [
     'remove-linkifiers.md',
     # Endpoint does not accept bot requests
     'get-user-groups.md',
+    # Example files do not exist
+    'upload-custom-emoji.md',
 ]
 
 def test_generated_curl_examples_for_success(client: Client) -> None:

zerver/openapi/zulip.yaml

@@ -1747,6 +1747,7 @@ paths:
                 filename:
                   type: string
                   format: binary
+                  example: /path/to/img.png
       security:
       - basicAuth: []
       responses: