Add Tab Completion and Macports

docs/osx.rst

@@ -5,7 +5,7 @@ OSX Guide
 Installation
 ============
 
-You can install xonsh using homebrew, conda, pip, or from source.
+You can install xonsh using a package manager including homebrew, macports, conda, pip, or from source.
 
 **homebrew:**
 
@@ -14,6 +14,12 @@ You can install xonsh using homebrew, conda, pip, or from source.
    $ brew install xonsh
 
 
+**MacPorts:**
+
+.. code-block:: console
+
+   $ sudo port install xonsh
+
 **conda:**
 
 .. code-block:: console
@@ -37,13 +43,23 @@ the following from the source directory,
 
     $ python3 setup.py install
 
+Extras for macOS
+==================
+readline
+--------
+
+On macOS, it is *strongly* recommended to install the ``gnureadline`` library if using the readline shell.  ``gnureadline`` can be installed via pip:
+
+.. code-block:: console
+
+    $ pip3 install gnureadline
 
 Path Helper
-===========
+-----------
 
 macOS provides a `path helper
 <http://www.softec.lu/site/DevelopersCorner/MasteringThePathHelper>`_,
-which by default configures paths in bash and other shells. Without
+which by default configures paths in bash and other POSIX or C  shells. Without
 including these paths, common tools including those installed by Homebrew
 may be unavailable. See ``/etc/profile`` for details on how it is done.
 To ensure the path helper is invoked on xonsh (for all users), add the
@@ -56,21 +72,38 @@ To incorporate the whole functionality of ``/etc/profile``::
     source-bash --seterrprevcmd "" /etc/profile
 
 
-Extras for OSX
-==============
 
-On Mac OSX, it is *strongly* recommended to install the ``gnureadline`` library if using the readline shell.  ``gnureadline`` can be installed via pip:
+Tab completion
+--------------
+Xonsh has support for using bash completion files on the shell, to use it you need to install the bash-completion package. The regular bash-completion package uses v1 which mostly works, but `occasionally has rough edges <https://github.com/xonsh/xonsh/issues/2111>`_ so we recommend using bash-completion v2.
 
-.. code-block:: console
+Bash completion comes from <https://github.com/scop/bash-completion> which suggests you use a package manager to install it, this manager will also install a new version of bash without affecting  /bin/bash. Xonsh also needs to be told where the bash shell file that builds the completions is, this has to be added to $BASH_COMPLETIONS. The package includes completions fopr many Unix commands.
 
-    $ pip3 install gnureadline
+Common packaging systems for MacOs include
 
-Xonsh has support for using bash completion files on the shell, to use it you need to install the bash-completion package. The regular bash-completion package uses v1 which mostly works, but `occasionally has rough edges <https://github.com/xonsh/xonsh/issues/2111>`_ so we recommend using bash-completion v2 which is installed using the bash-completion2 package.
+ -  Homebrew where the bash-completion2 package needs to be installed.
 
-.. code-block:: console
+    .. code-block:: console
 
        $ brew install bash-completion2
        
+    This will install the bash_completion file in `/usr/local/share/bash-completion/bash_completion` which is in the current xonsh code and so should just work.
+
+ - `MacPorts <https://trac.macports.org/wiki/howto/bash-completion>`_ where the bash-completion port needs to be installed.
+
+    .. code-block:: console
+
+       $ sudo port install bash-completion
+
+    This includes a bash_completion file that needs to be added to the environment.
+
+    .. code-block:: console
+
+       $ $BASH_COMPLETIONS.insert(0, '/opt/local/share/bash-completion/bash_completion')
+
+Note that the `bash completion project page <https://github.com/scop/bash-completion>`_ gives the script to be called as in .../profile.d/bash_completion.sh which will the call the script mentioned above and one in $XDG_CONFIG_HOME . Currently xonsh seems only to be able to read the first script directly.
+
+
 .. include:: dependencies.rst
 
 Customization