docs: document CLIBuilder class in tips and tricks

docs/articles/tips-and-tricks.rst

@@ -7,6 +7,7 @@ inspiration for your project.
 .. toctree::
     :maxdepth: 2
 
+    tips-and-tricks/cli-builder
     tips-and-tricks/backup-restore
     tips-and-tricks/features-detection
     tips-and-tricks/pytest-fixtures

docs/articles/tips-and-tricks/cli-builder.rst

@@ -0,0 +1,95 @@
+Building command line
+#####################
+
+Pytest-mh provides a built in :class:`~pytest_mh.cli.CLIBuilder` class that
+helps with constructing a command line for execution, especially when using
+optional values since it can easily skip parameters that are set to ``None``.
+There are three methods available within the class:
+
+* :meth:`~pytest_mh.cli.CLIBuilder.command`
+* :meth:`~pytest_mh.cli.CLIBuilder.argv`
+* :meth:`~pytest_mh.cli.CLIBuilder.args`
+
+:meth:`~pytest_mh.cli.CLIBuilder.args` processes the arguments, combines them
+with given values and returns the command line as a list.
+:meth:`~pytest_mh.cli.CLIBuilder.argv` works in the same way, but it returns the
+full ``argv`` list (including the command name) that is ready to be executed
+with :meth:`~pytest_mh.conn.Connection.exec` and finally
+:meth:`~pytest_mh.cli.CLIBuilder.command` returns a string that can be passed
+directly to :meth:`~pytest_mh.conn.Connection.run`.
+
+All methods take a dictionary, where key is the parameter name and value is a
+tuple of parameter type and its value. The parameter type is one of
+:class:`CLIBuilder.option <pytest_mh.cli.CLIBuilder.option>` value that can
+differentiate between positional, key-value or switch argument. This dictionary
+is then consumed by one of the methods, if a parameter value inside the tuple is
+``None`` then this parameter is omitted.
+
+.. code-block:: python
+    :caption: Example of CLIBuilder.command
+
+    cli = CLIBuilder(Bash())
+    args: CLIBuilderArgs = {
+        "password": (cli.option.VALUE, None),     # None values are ignored
+        "home": (cli.option.VALUE, "/home/jdoe"), # --home '/home/jdoe'
+        "enabled": (cli.option.SWITCH, True),     # --enabled
+        "login": (cli.option.POSITIONAL, "jdoe"), # 'jdoe'
+    }
+
+    line = cli.command("add-user", args)
+    # add-user --home '/home/jdoe' --enabled 'jdoe'
+
+.. code-block:: python
+    :caption: Example of CLIBuilder.argv
+
+    cli = CLIBuilder(Bash())
+    args: CLIBuilderArgs = {
+        "password": (cli.option.VALUE, None),     # None values are ignored
+        "home": (cli.option.VALUE, "/home/jdoe"), # --home '/home/jdoe'
+        "enabled": (cli.option.SWITCH, True),     # --enabled
+        "login": (cli.option.POSITIONAL, "jdoe"), # 'jdoe'
+    }
+
+    line = cli.argv("add-user", args)
+    # ["add-user", "--home", "/home/jdoe", "--enabled", "jdoe"]
+
+.. code-block:: python
+    :caption: Example of CLIBuilder.args
+
+    cli = CLIBuilder(Bash())
+    args: CLIBuilderArgs = {
+        "password": (cli.option.VALUE, None),     # None values are ignored
+        "home": (cli.option.VALUE, "/home/jdoe"), # --home '/home/jdoe'
+        "enabled": (cli.option.SWITCH, True),     # --enabled
+        "login": (cli.option.POSITIONAL, "jdoe"), # 'jdoe'
+    }
+
+    line = cli.args(args)
+    # ["--home", "/home/jdoe", "--enabled", "jdoe"]
+
+    host.conn.run(f"user-add --encrypt-home {' '.join(line)}")
+
+.. note::
+
+    There is also :attr:`CLIBuilder.option.PLAIN
+    <pytest_mh.cli.CLIBuilder.option.PLAIN>`. This option behaves similarly to
+    :attr:`CLIBuilder.option.VALUE
+    <pytest_mh.cli.CLIBuilder.option.VALUE>` but it does not quote the
+    value (if quoting is enabled -- which is the default behavior of
+    :meth:`~pytest_mh.cli.CLIBuilder.command`), it just adds the value to the
+    position as is.
+
+    .. code-block:: python
+        :caption: Example of CLIBuilder.option.PLAIN
+
+        cli = CLIBuilder(Bash())
+        args: CLIBuilderArgs = {
+            "password": (cli.option.PLAIN, "`encrypt-password 123456`"), # use value as-is
+            "home": (cli.option.VALUE, "/home/jdoe"),                    # --home '/home/jdoe'
+            "enabled": (cli.option.SWITCH, True),                        # --enabled
+            "login": (cli.option.POSITIONAL, "jdoe"),                    # 'jdoe'
+        }
+
+        line = cli.command("add-user", args)
+        # add-user --password `encrypt-password 123456` --home '/home/jdoe' --enabled 'jdoe'
+