Add an all-groups option to export such that export will handle exporting all groups

src/poetry_plugin_export/command.py

@@ -42,6 +42,7 @@ class ExportCommand(GroupCommand):
             "Include development dependencies. (<warning>Deprecated</warning>)",
         ),
         *GroupCommand._group_dependency_options(),
+        option("all-groups", None, "Include all sets of extra groups"),
         option(
             "extras",
             "E",
@@ -92,7 +93,6 @@ def handle(self) -> int:
                 "</warning>"
             )
 
-        # Checking extras
         if self.option("extras") and self.option("all-extras"):
             self.line_error(
                 "<error>You cannot specify explicit"
@@ -116,8 +116,22 @@ def handle(self) -> int:
                     f"Extra [{', '.join(sorted(invalid_extras))}] is not specified."
                 )
 
+        if self.option("with") and self.option("all-groups"):
+            self.line_error(
+                "<error>You cannot specify explicit"
+                " `<fg=yellow;options=bold>--with</>` while exporting"
+                " using `<fg=yellow;options=bold>--all-groups</>`.</error>"
+            )
+            return 1
+
+        groups = (
+            self.poetry.package.dependency_group_names(include_optional=True)
+            if self.option("all-groups")
+            else self.activated_groups
+        )
+
         exporter = Exporter(self.poetry, self.io)
-        exporter.only_groups(list(self.activated_groups))
+        exporter.only_groups(list(groups))
         exporter.with_extras(list(extras))
         exporter.with_hashes(not self.option("without-hashes"))
         exporter.with_credentials(self.option("with-credentials"))

tests/command/test_command_export.py

@@ -237,6 +237,23 @@ def test_extras_conflicts_all_extras(tester: CommandTester, do_lock: None) -> No
     )
 
 
+def test_export_with_all_groups(tester: CommandTester, do_lock: None) -> None:
+    tester.execute("--format requirements.txt --all-groups")
+    output = tester.io.fetch_output()
+    assert f"baz==2.0.0 ; {MARKER_PY}" in output
+    assert f"opt==2.2.0 ; {MARKER_PY}" in output
+
+
+def test_with_conflicts_all_groups(tester: CommandTester, do_lock: None) -> None:
+    tester.execute("--with=bar --all-groups")
+
+    assert tester.status_code == 1
+    assert (
+        "You cannot specify explicit `--with` while exporting using `--all-groups`.\n"
+        in tester.io.fetch_error()
+    )
+
+
 def test_export_with_urls(
     monkeypatch: MonkeyPatch, tester: CommandTester, poetry: Poetry
 ) -> None: