Make all doc fragments, module utils, and plugin utils private (#11896)

* Make all doc fragments private.

* Make all plugin utils private.

* Make all module utils private.

* Reformat.

* Changelog fragment.

* Update configs and ignores.

* Adjust unit test names.

plugins/module_utils/_gio_mime.py

@@ -0,0 +1,40 @@
+# Copyright (c) 2022, Alexei Znamensky <russoz@gmail.com>
+# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# Note that this module util is **PRIVATE** to the collection. It can have breaking changes at any time.
+# Do not use this from other collections or standalone plugins/modules!
+
+from __future__ import annotations
+
+import typing as t
+
+from ansible_collections.community.general.plugins.module_utils._cmd_runner import CmdRunner, cmd_runner_fmt
+
+if t.TYPE_CHECKING:
+    from ansible.module_utils.basic import AnsibleModule
+
+
+def gio_mime_runner(module: AnsibleModule, **kwargs) -> CmdRunner:
+    return CmdRunner(
+        module,
+        command=["gio"],
+        arg_formats=dict(
+            mime=cmd_runner_fmt.as_fixed("mime"),
+            mime_type=cmd_runner_fmt.as_list(),
+            handler=cmd_runner_fmt.as_list(),
+            version=cmd_runner_fmt.as_fixed("--version"),
+        ),
+        **kwargs,
+    )
+
+
+def gio_mime_get(runner: CmdRunner, mime_type) -> str | None:
+    def process(rc, out, err) -> str | None:
+        if err.startswith("No default applications for"):
+            return None
+        out = out.splitlines()[0]
+        return out.split()[-1]
+
+    with runner("mime mime_type", output_process=process) as ctx:
+        return ctx.run(mime_type=mime_type)