Fix an error in show when using the -o option (#1607)

poetry/console/commands/show.py

@@ -172,6 +172,13 @@ lists all packages available."""
                         # Non installed in non decorated mode
                         install_marker = " (!)"
 
+            if (
+                show_latest
+                and self.option("outdated")
+                and latest_statuses[locked.pretty_name] == "up-to-date"
+            ):
+                continue
+
             line = "<fg={}>{:{}}{}</>".format(
                 color, name, name_length - len(install_marker), install_marker
             )
@@ -183,9 +190,6 @@ lists all packages available."""
                 latest = latest_packages[locked.pretty_name]
                 update_status = latest_statuses[locked.pretty_name]
 
-                if self.option("outdated") and update_status == "up-to-date":
-                    continue
-
                 if write_latest:
                     color = "green"
                     if update_status == "semver-safe-update":

tests/console/commands/test_show.py

@@ -379,6 +379,46 @@ cachy 0.1.0 0.2.0 Cachy package
     assert expected == tester.io.fetch_output()
 
 
+def test_show_outdated_with_only_up_to_date_packages(app, poetry, installed, repo):
+    command = app.find("show")
+    tester = CommandTester(command)
+
+    cachy_020 = get_package("cachy", "0.2.0")
+    cachy_020.description = "Cachy package"
+
+    installed.add_package(cachy_020)
+    repo.add_package(cachy_020)
+
+    poetry.locker.mock_lock_data(
+        {
+            "package": [
+                {
+                    "name": "cachy",
+                    "version": "0.2.0",
+                    "description": "Cachy package",
+                    "category": "main",
+                    "optional": False,
+                    "platform": "*",
+                    "python-versions": "*",
+                    "checksum": [],
+                },
+            ],
+            "metadata": {
+                "python-versions": "*",
+                "platform": "*",
+                "content-hash": "123456789",
+                "hashes": {"cachy": []},
+            },
+        }
+    )
+
+    tester.execute("--outdated")
+
+    expected = ""
+
+    assert expected == tester.io.fetch_output()
+
+
 def test_show_outdated_has_prerelease_but_not_allowed(app, poetry, installed, repo):
     command = app.find("show")
     tester = CommandTester(command)