dotfiles/vim/doc/jedi-vim.txt

*jedi-vim.txt* - For Vim version 7.3 - Last change: 2014/07/29
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          jedi-vim - awesome Python autocompletion with Vim

==============================================================================
Contents				*jedi-vim-contents*

1. Introduction				|jedi-vim-introduction|
2. Installation				|jedi-vim-installation|
    2.0. Requirements			|jedi-vim-installation-requirements|
    2.1. Manually			|jedi-vim-installation-manually|
    2.2. Using Pathogen			|jedi-vim-installation-pathogen|
    2.3. Using Vundle			|jedi-vim-installation-vundle|
    2.4. Installing from Repositories	|jedi-vim-installation-repos|
3. Supported Python features		|jedi-vim-support|
4. Usage				|jedi-vim-usage|
5. Mappings				|jedi-vim-keybindings|
    5.1. Start completion		|g:jedi#completions_command|
    5.2. Go to assignment		|g:jedi#goto_assignments_command|
    5.3. Get original definition	|g:jedi#goto_definitions_command|
    5.4. Show documentation		|g:jedi#documentation_command|
    5.5. Rename variables		|g:jedi#rename_command|
    5.6. Show name usages		|g:jedi#usages_command|
    5.7. Open module by name 		|:Pyimport|
6. Configuration			|jedi-vim-configuration|
    6.1. auto_initialization		|g:jedi#auto_initialization|
    6.2. auto_vim_configuration		|g:jedi#auto_vim_configuration|
    6.3. popup_on_dot			|g:jedi#popup_on_dot|
    6.4. popup_select_first		|g:jedi#popup_select_first|
    6.5. auto_close_doc			|g:jedi#auto_close_doc|
    6.6. show_call_signatures		|g:jedi#show_call_signatures|
    6.7. use_tabs_not_buffers		|g:jedi#use_tabs_not_buffers|
    6.8. squelch_py_warning		|g:jedi#squelch_py_warning|
    6.9. completions_enabled		|g:jedi#completions_enabled|
    6.10. use_splits_not_buffers	|g:jedi#use_splits_not_buffers|
    6.11. force_py_version              |g:jedi#force_py_version|
7. Testing				|jedi-vim-testing|
8. Contributing				|jedi-vim-contributing|
9. License				|jedi-vim-license|

==============================================================================
1. Introduction				*jedi-vim-introduction*

Jedi-vim is a Vim binding to the awesome Python autocompletion library
`jedi`. Among jedi's (and, therefore, jedi-vim's) features are:

- Completion for a wide array of Python features (see |jedi-vim-support|)
- Robust in dealing with syntax errors and wrong indentation
- Parses complex module/function/class structures
- Infers function arguments from Sphinx/Epydoc strings
- Doesn't execute Python code
- Supports Virtualenv
- Supports Python 2.5+ and 3.2+

By leveraging this library, jedi-vim adds the following capabilities to Vim:

- Displaying function/class bodies
- "Go to definition" command
- Displaying docstrings
- Renaming and refactoring
- Looking up related names

==============================================================================
2. Installation				*jedi-vim-installation*

------------------------------------------------------------------------------
2.0. Requirements			*jedi-vim-installation-requirements*

First of all, jedi-vim requires Vim to be compiled with the `+python` option.

The jedi library has to be installed for jedi-vim to work properly.  You can
install it first, by using e.g. your distribution's package manager, or by
using pip: >

    pip install jedi

However, you can also install it as a git submodule if you don't want to use
jedi for anything but this plugin. How to do this is detailed below.

It is best if you have VIM >= 7.3, compiled with the `+conceal` option. With
older versions, you will probably not see the parameter recommendation list
for functions after typing the open bracket. Some platforms (including OS X
releases) do not ship a VIM with `+conceal`. You can check if your VIM has the
feature with >

    :ver

and look for "`+conceal`" (as opposed to "`-conceal`") or >

    :echo has('conceal')

which will report 0 (not included) or 1 (included). If your VIM lacks this
feature and you would like function parameter completion, you will need to
build your own VIM, or use a package for your operating system that has this
feature (such as MacVim on OS X, which also contains a console binary).

------------------------------------------------------------------------------
2.1. Installing manually		*jedi-vim-installation-manually*

1a. Get the latest repository from Github: >

    git clone http://github.com/davidhalter/jedi-vim path/to/bundles/jedi-vim

1b. If you want to install jedi as a submodule instead, issue this command: >

    git clone --recursive http://github.com/davidhalter/jedi-vim

2. Put the plugin files into their respective folders in your vim runtime
   directory (usually ~/.vim). Be sure to pay attention to the directory
   structure!
3. Update the Vim help tags with >

    :helptags <path/to/vimruntime>/doc

------------------------------------------------------------------------------
2.1. Installing using Pathogen		*jedi-vim-installation-pathogen*

Pathogen simplifies installation considerably.

1.a Clone the git repository into your bundles directory: >

    git clone http://github.com/davidhalter/jedi-vim path/to/bundles/jedi-vim

1b. Again, if you want to install jedi as a submodule, use this command
   instead: >

    git clone --recursive http://github.com/davidhalter/jedi-vim

------------------------------------------------------------------------------
2.3. Installing using Vundle		*jedi-vim-installation-vundle*

1. Vundle automatically downloads subrepositories as git submodules, so you
   will automatically get the jedi library with the jedi-vim plugin. Add the
   following to the Bundles section in your .vimrc file: >

    Plugin 'davidhalter/jedi-vim'

2. Issue the following command in Vim: >

    :PluginInstall

Help tags are generated automatically, so you should be good to go.

------------------------------------------------------------------------------
2.4. Installing from Repositories	*jedi-vim-installation-repos*

Some Linux distributions have jedi-vim packages in their official 
repositories. On Arch Linux, install vim-jedi. On Debian (8+) or Ubuntu 
(14.04+) install vim-python-jedi.

==============================================================================
3. Supported Python features		*jedi-vim-support*

The Jedi library does all the hard work behind the scenes. It supports
completion of a large number of Python features, among them:

- Builtins
- Multiple `return`s or `yield`s
- Tuple assignments/array indexing/dictionary indexing
- `with`-statement/exception handling
- `*args` and `**kwargs`
- Decorators, lambdas, closures
- Generators, iterators
- Some descriptors: `property`/`staticmethod`/`classmethod`
- Some magic methods: `__call__`, `__iter__`, `__next__`, `__get__`,
  `__getitem__`, `__init__`
- `list.append()`, `set.add()`, `list.extend()`, etc.
- (Nested) list comprehensions and ternary expressions
- Relative `import`s
- `getattr()`/`__getattr__`/`__getattribute__`
- Function annotations (py3k feature, are being ignored at the moment, but are
  parsed)
- Class decorators (py3k feature, are being ignored at the moment, but are
  parsed)
- Simple/usual `sys.path` modifications
- `isinstance` checks for `if`/`while`/`assert` case, that doesn’t work with
  Jedi
- And more...

Note: This list is not necessarily up to date. For a complete list of
features, please refer to the Jedi documentation at http://jedi.jedidjah.ch.

==============================================================================
4. Usage				*jedi-vim-usage*

With the default settings, autocompletion can be triggered by typing
<Ctrl-Space>. The first entry will automatically be selected, so you can press
<Return> to insert it into your code or keep typing and narrow down your
completion options. The usual <C-X><C-O> and <C-P>/<C-N> keybindings work as
well. Autocompletion is also triggered by typing a period in insert mode.
Since periods rarely occur in Python code outside of method/import lookups,
this is handy to have (but can be disabled).

When it encounters a new module, jedi might take a few seconds to parse that
module's contents. Afterwards, the contents are cached and completion will be
almost instantaneous.

==============================================================================
5. Key Bindings		    		*jedi-vim-keybindings*

All keybindings can be mapped by setting the appropriate global option. For
example, to set the keybinding for starting omnicompletion to <C-N> instead of
<Ctrl-Space>, add the following setting to your .vimrc file: >

    let g:jedi#completions_command = "<C-N>"

Note: If you have |g:jedi#auto_initialization| set to 0, you have to create
a mapping yourself by calling a function: >

    " Using <C-N> for omnicompletion
    inoremap <silent> <buffer> <C-N> <c-x><c-o>
    " Use <localleader>r (by default <\-r>) for renaming
    nnoremap <silent> <buffer> <localleader>r :call jedi#rename()<cr>
    " etc.

Note: You can set commands to '', which means that they are empty and not
assigned. It's an easy way to "disable" functionality of jedi-vim.

------------------------------------------------------------------------------
5.1. `g:jedi#completions_command`	*g:jedi#completions_command*
Function: n/a; see above
Default: <Ctrl-Space>			Start completion

Performs autocompletion (or omnicompletion, to be precise).

Note: If you want to use <Tab> for completion, please install Supertab:
https://github.com/ervandew/supertab.

------------------------------------------------------------------------------
5.2. `g:jedi#goto_assignments_command`	*g:jedi#goto_assignments_command*
Function: `jedi#goto_assignments()`
Default: <leader>g			Go to definition

This function finds the first definition of the function/class under the
cursor. It produces an error if the definition is not in a Python file.

------------------------------------------------------------------------------
5.3. `g:jedi#goto_definitions_command`	*g:jedi#goto_definitions_command*
Function: `jedi#goto_definitions()`
Default: <leader>d			Go to original definition

This command tries to find the original definition of the function/class under
the cursor. Just like the `jedi#goto_assignments()` function, it does not work
if the definition isn't in a Python source file.

The difference between `jedi#goto_assignments()` and `jedi#goto_definitions()`
is that the latter performs recursive lookups. Take, for example, the
following module structure: >

    # file1.py:
    from file2 import foo

    # file2.py:
    from file3 import bar as foo

    # file3.py
    def bar():
        pass

The `jedi#goto_assignments()` function will take you to the >

    from file2 import foo

statement in file1.py, while the `jedi#goto_definitions()` function will take
you all the way to the >

    def bar():

line in file3.py.

------------------------------------------------------------------------------
5.4. `g:jedi#documentation_command`	*g:jedi#documentation_command*
Function: `jedi#show_documentation()`
Default: <K>				Show pydoc documentation

This shows the pydoc documentation for the item currently under the cursor.
The documentation is opened in a horizontally split buffer.

------------------------------------------------------------------------------
5.5. `g:jedi#rename_command`		*g:jedi#rename_command*
Function: `jedi#rename()`
Default: <leader>r			Rename variables

Jedi-vim deletes the word currently under the cursor and puts Vim in insert
mode, where the user is expected to enter the new variable name. Upon leaving
insert mode, jedi-vim then renames all occurences of the old variable name
with the new one. The number of performed renames is displayed in the command
line.

------------------------------------------------------------------------------
5.6. `g:jedi#usages_command`		*g:jedi#usages_command*
Function: `jedi#usages()`
Default: <leader>n			Show usages of a name.

The quickfix window is populated with a list of all names which point to the
definition of the name under the cursor.

------------------------------------------------------------------------------
5.7. Open module by name		*:Pyimport*
Function: `jedi#py_import(args)`
Default: :Pyimport			e.g. `:Pyimport os` shows os.py in VIM.

Simulate an import and open that module in VIM.

==============================================================================
6. Configuration			*jedi-vim-configuration*

Note: You currently have to set these options in your .vimrc. Setting them in
an ftplugin (e.g. ~/.vim/ftplugin/python/jedi-vim-settings.vim) will not work
because jedi-vim is not set up as an filetype plugin, but as a "regular"
plugin.

------------------------------------------------------------------------------
6.1. `g:jedi#auto_initialization`	*g:jedi#auto_initialization*

Upon initialization, jedi-vim performs the following steps:

1. Set the current buffers 'omnifunc' to its own completion function
   `jedi#completions`
2. Create mappings to commands specified in |jedi-vim-keybindings|
3. Call `jedi#configure_call_signatures()` if
   `g:jedi#show_call_signatures` is set

You can disable the default initialization routine by setting this option to
0. Beware that you have to perform the above steps yourself, though.

Options: 0 or 1
Default: 1 (Perform automatic initialization)

------------------------------------------------------------------------------
6.2. `g:jedi#auto_vim_configuration`	*g:jedi#auto_vim_configuration*

Jedi-vim sets 'completeopt' to `menuone,longest,preview` by default, if
'completeopt' is not changed from Vim's default.
It also remaps <Ctrl-C> to <Esc> in insert mode.

If you want to keep your own configuration, disable this setting.

Options: 0 or 1
Default: 1 (Set 'completeopt' and mapping as described above)

------------------------------------------------------------------------------
6.3. `g:jedi#popup_on_dot`		*g:jedi#popup_on_dot*

Jedi-vim automatically starts completion upon typing a period in insert mode.

However, when working with large modules, this can slow down your typing flow
since you have to wait for jedi to parse the module and show the completion
menu. By disabling this setting, completion is only started when you manually
press the completion key.

Options: 0 or 1
Default: 1 (Start completion on typing a period)

------------------------------------------------------------------------------
6.4. `g:jedi#popup_select_first`	*g:jedi#popup_select_first*

Upon starting completion, jedi-vim can automatically select the first entry
that pops up (without actually inserting it).

This leads to a better typing flow: As you type more characters, the entries
in the completion menu are narrowed down. If they are narrowed down enough,
you can just press <Return> to insert the first match.

Options: 0 or 1
Default: 1 (Automatically select first completion entry)

------------------------------------------------------------------------------
6.5. `g:jedi#auto_close_doc`		*g:jedi#auto_close_doc*

When doing completion, jedi-vim shows the docstring of the currently selected
item in a preview window. By default, this window is being closed after
insertion of a completion item.

Set this to 0 to leave the preview window open even after leaving insert mode.
This could be useful if you want to browse longer docstrings.

Options: 0 or 1
Default: 1 (Automatically close preview window upon leaving insert mode)

------------------------------------------------------------------------------
6.6. `g:jedi#show_call_signatures`	*g:jedi#show_call_signatures*

Jedi-vim can display a small window detailing the arguments of the currently
completed function and highlighting the currently selected argument. This can
be disabled by setting this option to 0. Setting this option to 2 shows call
signatures in the command line instead of a popup window.

Options: 0, 1, or 2
Default: 1 (Show call signatures window)

Note: 'showmode' must be disabled for command line call signatures to be
visible.

Note: This setting is ignored if |g:jedi#auto_initialization| is set to 0. In
that case, if you want to see call signatures, you have to set it up
manually by calling a function in your configuration file: >

    call jedi#configure_call_signatures()

------------------------------------------------------------------------------
6.7. `g:jedi#use_tabs_not_buffers`	*g:jedi#use_tabs_not_buffers*

By default, jedi-vim opens a new tab if you use the "go to", "show
definition", or "related names" commands. When you set this option to 0, they
open in the current buffer instead.

Options: 0 or 1
Default: 1 (Command output is put in a new tab)

------------------------------------------------------------------------------
6.8. `g:jedi#squelch_py_warning`	*g:jedi#squelch_py_warning*

When Vim has not been compiled with +python, jedi-vim shows a warning to that
effect and aborts loading itself. Set this to 1 to suppress that warning.

Options: 0 or 1
Default: 0 (Warning is shown)

------------------------------------------------------------------------------
6.9. `g:jedi#completions_enabled`	*g:jedi#completions_enabled*

If you don't want Jedi completion, but all the other features, you can disable
it in favor of another completion engine (that probably also uses Jedi, like
YCM).

Options: 0 or 1
Default: 1

------------------------------------------------------------------------------
6.10. `g:jedi#use_splits_not_buffers`	*g:jedi#use_splits_not_buffers*

If you want to open new split for "go to", you could set this option to the
direction which you want to open a split with.

Options: top, left, right, bottom or winwidth
Default: "" (not enabled by default)

Note: with the 'winwidth' option the window is split vertically or horizontally
depending on the width of the window relative to 'textwidth'. This essentially
means that if the window is big enough it will be split vertically but if it is
small a horizontal split happens.

------------------------------------------------------------------------------
6.11. `g:jedi#force_py_version`                *g:jedi#force_py_version*

If you have installed both python 2 and python 3, you can force which one jedi
should use by setting this variable. It forces the internal Vim command, which
will be used for every jedi call to the respective python interpreter.
The variable can be set in the .vimrc like this to force python 3:

let g:jedi#force_py_version = 3

This variable can be switched during runtime using the following function:
Function: `jedi#force_py_version_switch()`

or set directly using this function, which has the same name as the variable:
Function: `jedi#force_py_version(py_version)`

Options: 2 or 3
Default: "auto" (will use sys.version_info from "python" in your $PATH)

==============================================================================
7. Testing				*jedi-vim-testing*

jedi-vim is being tested with a combination of vspec
https://github.com/kana/vim-vspec and py.test http://pytest.org/.

The tests are in the test subdirectory, you can run them calling::

    py.test

The tests are automatically run with `travis
<https://travis-ci.org/davidhalter/jedi-vim>`_.

==============================================================================
8. Contributing				*jedi-vim-contributing*

We love Pull Requests! Read the instructions in `CONTRIBUTING.md`.

==============================================================================
9. License				*jedi-vim-license*

Jedi-vim is licensed with the MIT license.

 vim: textwidth=78 tabstop=8 filetype=help:norightleft: