http://sontek.net/blog/detail/turning-vim-into-a-modern-python-ide
Contents
Intro
Basic Editing and Debugging
Code Folding
Window Splits
Snippets
Task lists
Revision History
Syntax Highlighting and Validation
Pep8
Tab Completion and Documentation
Code Navigation
Buffers
Fuzzy Text File Search
File Browser
Refactoring and Go to definition
Searching
Integration with Git
Test Integration
django nose
py.test
Virtualenv
Django
Random Tips
TL;DR:
$ git clone https://github.com/sontek/dotfiles.git $ cd dotfiles $ ./install.sh vim
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Intro
Back in 2008, I wrote the article Python with a modular IDE (Vim). Years later, I have people e-mailing me and commenting daily asking for more information, even though most of the information in it is outdated. Here is the modern way to work with Python and Vim to achieve the perfect environment.
Because one of the most important parts about a development environment is the ability to easily reproduce across machines, we are going to store our vim configuration in git:
$ mkdir ~/.vim/
$ mkdir ~/.vim/{autoload,bundle}
$ cd ~/.vim/
$ git init
The purpose of the autoload directory is to automatically load the vim pluginPathogen, which we'll then use to load all other plugins that are located in the bundle directory. So download pathogen and put it in your autoload folder.
You'll need to add the following to your ~/.vimrc so that pathogen will be loaded properly. Filetype detection must be off when you run the commands so its best to execute them first:
filetype off call pathogen#runtime_append_all_bundles() call pathogen#helptags()
Now lets add all of the vim plugins we plan on using as submodules to our git repository:
git submodule add http://github.com/tpope/vim-fugitive.git bundle/fugitive git submodule add https://github.com/msanders/snipmate.vim.git bundle/snipmate git submodule add https://github.com/tpope/vim-surround.git bundle/surround git submodule add https://github.com/tpope/vim-git.git bundle/git git submodule add https://github.com/ervandew/supertab.git bundle/supertab git submodule add https://github.com/sontek/minibufexpl.vim.git bundle/minibufexpl git submodule add https://github.com/wincent/Command-T.git bundle/command-t git submodule add https://github.com/mitechie/pyflakes-pathogen.git git submodule add https://github.com/mileszs/ack.vim.git bundle/ack git submodule add https://github.com/sjl/gundo.vim.git bundle/gundo git submodule add https://github.com/fs111/pydoc.vim.git bundle/pydoc git submodule add https://github.com/vim-scripts/pep8.git bundle/pep8 git submodule add https://github.com/alfredodeza/pytest.vim.git bundle/py.test git submodule add https://github.com/reinh/vim-makegreen bundle/makegreen git submodule add https://github.com/vim-scripts/TaskList.vim.git bundle/tasklist git submodule add https://github.com/vim-scripts/The-NERD-tree.git bundle/nerdtree git submodule add https://github.com/sontek/rope-vim.git bundle/ropevim git submodule init git submodule update git submodule foreach git submodule init git submodule foreach git submodule update
Thats it! Now that we've got our vim configuration in git!
Now lets look at how to use each of these plugins to improve the power of vim:
Basic Editing and Debugging
Code Folding
Lets first enable code folding. This makes it a lot easier to organize your code and hide portions that you aren't interested in working on. This is quite easy for Python, since whitespace is required.
In your ~/.vimrc just add:
set foldmethod=indent set foldlevel=99
Then you will be able to be inside a method and type 'za' to open and close a fold.
Window Splits
Sometimes code folding isn't enough; you may need to start opening up multiple windows and working on multiple files at once or different locations within the same file. To do this in vim, you can use these shortcuts:
Vertical Split : Ctrl+w + v Horizontal Split: Ctrl+w + s Close current windows: Ctrl+w + q
I also like to bind Ctrl+
mapj map k map l map h
Snippets
The next tweak that really speeds up development is using snipmate. We've already included it in our bundle/ folder so its already enabled. Try opening up a python file and typing 'def
I also like to create my own snippets folder to put in some custom snippets:
$ mkdir ~/.vim/snippets $ vim ~/.vim/snippets/python.snippets
Put this in the file:
snippet pdb
import pdb; pdb.set_trace()
Now you can type pdb
Task lists
Another really useful thing is to mark some of your code as TODO or FIXME! I know we all like to think we write perfect code, but sometimes you just have to settle and leave a note for yourself to come back later. One of the plugins we included was the tasklist plugin that will allow us to search all open buffers for things to fix. Just add a mapping to open it in ~/.vimrc:
maptd TaskList
Now you can hit
Revision History
The final basic editing tweak I suggest everyone start utilizing is the Gundo plugin. It'll allow you to view diff's of every save on a file you've made and allow you to quickly revert back and forth:
Just bind a key in your .vimrc to toggle the Gundo window:
mapg :GundoToggle
Syntax Highlighting and Validation
Simply enable syntax highlighting in your ~/.vimrc:
syntax on " syntax highlighing filetype on " try to detect filetypes filetype plugin indent on " enable loading indent file for filetype
Because we enabled pyflakes when we added it as a submodule in ~/.vim/bundle, it will notify you about unused imports and invalid syntax. It will save you a lot of time saving and running just to find out you missed a colon. I like to tell it not use the quickfix window:
let g:pyflakes_use_quickfix = 0
Pep8
The final plugin that really helps validate your code is the pep8 plugin, it'll make sure your code is consistent across all projects. Add a key mapping to your ~/.vimrc and then you'll be able to jump to each of the pep8 violations in the quickfix window:
let g:pep8_map='8'
Tab Completion and Documentation
Vim has many different code completion options. We are going to use the SuperTab plugin to check the context of the code you are working on and choose the best for the situation. We've already enabled the SuperTab plugin in the bundle/ folder, so we just have to configure it to be context sensitive and to enable omni code completion in your ~/.vimrc:
au FileType python set omnifunc=pythoncomplete#Complete let g:SuperTabDefaultCompletionType = "context"
Now we just enable the menu and pydoc preview to get the most useful information out of the code completion:
set completeopt=menuone,longest,preview
We also enabled the pydoc plugin at the beginning with all the submodules; that gives us the ability to hit
Code Navigation
Buffers
The most important part about navigating code within vim, is to completely understand how to use buffers. There is no reason to use tabs. Open files with :e
You can switch between the buffers using b
To close a buffer you use :bd or :bw.
Fuzzy Text File Search
To make finding and opening files within your project even easier, we are going to use the command-t plugin. It does have some parts that need to be compiled, so its not already installed by adding it as a submodule. Go to your ~/.vim/bundle/command-t folder and run 'rake make'. Yes you need ruby installed. By default, command-t is bound to
It also supports searching only through opened buffers, instead of files using
File Browser
NERD Tree is a project file browser. I must admit I used this heavily back when I was migrating from Visual Studio and used to the Solution Explorer, but I rarely use it anymore. Command-T is usually all you'll need. It is useful when you are getting to know a new codebase for the first time though. Lets bind a shortcut key for opening it:
mapn :NERDTreeToggle
Refactoring and Go to definition
Ropevim is also a great tool that will allow you to navigate around your code. It supports automatically inserting import statements, goto definition, refactoring, and code completion. You'll really want to read up on everything it does, but the two big things I use it for is to jump to function or class definitions quickly and to rename things (including all their references).
For instance, if you are using django and you place your cursor over the class models.Model you reference and then called :RopeGotoDefintion, it would jump you straight to the django library to that class definition. We already have it installed in our bundles, so we bind it to a key to use it:
mapj :RopeGotoDefinition map r :RopeRename
Searching
The final tool that really speeds up navigating your code is the Ack plugin. Ack is similar to grep, but much better in my opinion. You can fuzzy text search for anything in your code (variable name, class, method, etc) and it'll give you a list of files and line numbers where they are defined so you can quickly cycle through them. Just bind the searching to a key:
nmapa :Ack!
We use ! at the end of it so it doesn't open the first result automatically.
Integration with Git
We installed 2 plugins, git.vim and fugitive, that give us all the integration we need. Git.vim will provide us syntax highlighting for git configuration files; fugitive provides a great interface for interacting with git including getting diffs, status updates, committing, and moving files.
Fugitive also allows you to view what branch you are working in directly from vim. Add this to your statusline in ~/.vimrc:
%{fugitive#statusline()}
The big commands you need to know:
Gblame: This allows you to view a line by line comparison of who the last person to touch that line of code is.
Gwrite: This will stage your file for commit, basically doing git add
Gread: This will basically run a git checkout
Gcommit: This will just run git commit. Since its in a vim buffer, you can use keyword completion (Ctrl-N), like test_all
to find the method name in your buffer and complete it for the commit message. You can also use + and - on the filenames in the message to stage/unstage them for the commit.
Test Integration
django nose
Test runner integration really depends on the testing library you are using and what type of tests you are running but we included a great generic plugin called MakeGreen that executes off of vim's makeprg variable. So for instance, if you are using django with django-nose you could define a shortcut key in your ~/.vimrc like this:
mapdt :set makeprg=python\ manage.py\ test\|:call MakeGreen()
This will just give you a green bar at the bottom of vim if your test passed or a red bar with the message of the failed test if it doesn't. Very simple.
py.test
I also included the py.test vim plugin for those who prefer it. This plugin has a lot more functionality including executing individual tests by class, file, or method. You can also cycle through the individual assertion errors. I have the following bindings:
" Execute the tests nmaptf :Pytest file nmap tc :Pytest class nmap tm :Pytest method " cycle through test errors nmap tn :Pytest next nmap tp :Pytest previous nmap te :Pytest error
Virtualenv
Vim doesn't realize that you are in a virtualenv so it wont give you code completion for libraries only installed there. Add the following script to your ~/.vimrc to fix it:
" Add the virtualenv's site-packages to vim path
py << EOF
import os.path
import sys
import vim
if 'VIRTUAL_ENV' in os.environ:
project_base_dir = os.environ['VIRTUAL_ENV']
sys.path.insert(0, project_base_dir)
activate_this = os.path.join(project_base_dir, 'bin/activate_this.py')
execfile(activate_this, dict(__file__=activate_this))
EOF
Django
The only true django tweak I make is before I open vim I'll export the DJANGO_SETTINGS_MODULE environment so that I get code completion for django modules as well:
export DJANGO_SETTINGS_MODULE=project.settings
Random Tips
If you want to find a new color scheme just go tohttp://code.google.com/p/vimcolorschemetest/ to preview a large selection.