Sort cylc show task proxies

changes.d/6266.feat.md

@@ -0,0 +1 @@
+'cylc show' task output is now sorted by the task id

cylc/flow/scripts/show.py

@@ -288,8 +288,10 @@ async def prereqs_and_outputs_query(
         }
     }
     results = await pclient.async_request('graphql', tp_kwargs)
-    multi = len(results['taskProxies']) > 1
-    for t_proxy in results['taskProxies']:
+    task_proxies = sorted(results['taskProxies'],
+                          key=lambda proxy: proxy['id'])
+    multi = len(task_proxies) > 1
+    for t_proxy in task_proxies:
         task_id = Tokens(t_proxy['id']).relative_id
         state = t_proxy['state']
         if options.json:
@@ -379,7 +381,7 @@ async def prereqs_and_outputs_query(
 
                 print_completion_state(t_proxy)
 
-    if not results['taskProxies']:
+    if not task_proxies:
         ansiprint(
             f"<red>No matching active tasks found: {', '.join(ids_list)}",
             file=sys.stderr)

tests/integration/scripts/test_show.py

@@ -150,3 +150,46 @@ async def test_task_meta_query(mod_my_schd, capsys):
             'URL': 'http://hasthelargehadroncolliderdestroyedtheworldyet.com/',
         }
     }
+
+
+async def test_task_instance_query(
+    flow, scheduler, start, capsys
+):
+    """It should fetch task instance data, sorted by task name."""
+
+    colour_init(strip=True, autoreset=True)
+    opts = SimpleNamespace(
+        comms_timeout=5,
+        json=False,
+        task_defs=None,
+        list_prereqs=False,
+    )
+    schd = scheduler(
+        flow(
+            {
+               'scheduling': {
+                   'graph': {'R1': 'zed & dog & cat & ant'},
+               },
+           }
+        ),
+       paused_start=False
+    )
+    async with start(schd):
+        await schd.update_data_structure()
+        ret = await show(
+            schd.workflow,
+            [Tokens('//1/*')],
+            opts,
+        )
+        assert ret == 0
+
+    out, _ = capsys.readouterr()
+    assert [
+         line for line in out.splitlines()
+         if line.startswith("Task ID")
+    ] == [  # results should be sorted
+        'Task ID: 1/ant',
+        'Task ID: 1/cat',
+        'Task ID: 1/dog',
+        'Task ID: 1/zed',
+    ]