One-liner:

rm -fR ~/.vim && git clone https://github.com/codegram/vimfiles.git ~/.vim && rm ~/.vimrc && ln -s ~/.vim/vimrc ~/.vimrc && curl https://raw.githubusercontent.com/Shougo/neobundle.vim/master/bin/install.sh | sh && vim +NeoBundleInstall +qa! && clear && echo "Done! :)"

• The leader key is , (comma).

• ,n renames current file, asking for the new name.

• Arrow keys are disabled.
• jk is mapped to <ESC>, so you don't have to reach out to <ESC>.

• ,<Space> clears the search.

• ,w maps to :w!: it saves the current buffer.
• ,q maps to :wqa!: it saves all buffers and quits.
• <tab> / <S-tab> rotates among open buffers.
• <leader>d closes the current buffer.

• ,v opens a new vertical split and switches to it.
• <C-h> switches to the left split.
• <C-j> switches to the split below.
• <C-k> switches to the split above.
• <C-l> switches to the right split.

• <F2> to toggle Paste mode (to paste stuff from the system clipboard).

Use Ag (the silver searcher) to search through your code.

• ,a performs an Ag search.
• <C-n> / <C-p>: Rotate among results.

Auto-closes, parens, curly braces, everything.

First, brew install ctags and run the ctags -R . command on your working directory to generate the tag list.

• <C-]> to go to the definition of the word under the cursor (constant, method, whatever
• <C-p> to come back.
• <F7> / <F9> to rotate among multiple definitions of the same tag.
• <Leader>c to search among tags with the CtrlP plugin.
• <Leader>b to toggle the Tagbar

Use Git from Vim.

• ,gs: Git status.
• ,gc: Git commit.
• ,gb in visual mode: Git blame.

• :Gist [-p|-P]: Post a [p]rivate or [P]ublic gist with the current buffer. You can also run it from Visual mode to post only a part.

Comments any kind of code.

• ,co: In visual mode, comments the selected block.