✨ A (Neo)vim plugin for formatting code.
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lpil and sbdchd Support ReasonML interface files (#177)
The previous configuration assumed that ReasonML files would always be
implementation files rather than interfaces files, so it would not be
able to format all files in a project.

The same may need to be done for OCaml.
Latest commit f20e731 Jul 17, 2018


Neoformat Build Status

A (Neo)vim plugin for formatting code.

Neoformat uses a variety of formatters for many filetypes. Currently, Neoformat will run a formatter using the current buffer data, and on success it will update the current buffer with the formatted text. On a formatter failure, Neoformat will try the next formatter defined for the filetype.

By using getbufline() to read from the current buffer instead of file, Neoformat is able to format your buffer without you having to :w your file first. Also, by using setline(), marks, jumps, etc. are all maintained after formatting.

Neoformat supports both sending buffer data to formatters via stdin, and also writing buffer data to /tmp/ for formatters to read that do not support input via stdin.

Basic Usage

Format the entire buffer, or visual selection of the buffer


Or specify a certain formatter (must be defined for the current filetype)

:Neoformat jsbeautify

Or format a visual selection of code in a different filetype

Note: you must use a ! and pass the filetype of the selection

:Neoformat! python

You can also pass a formatter to use

:Neoformat! python yapf

Or perhaps run a formatter on save

augroup fmt
  autocmd BufWritePre * undojoin | Neoformat
augroup END

The undojoin command will put changes made by Neoformat into the same undo-block with the latest preceding change. See Managing Undo History.



Plug 'sbdchd/neoformat'

Current Limitation(s)

If a formatter is either not configured to use stdin, or is not able to read from stdin, then buffer data will be written to a file in /tmp/neoformat/, where the formatter will then read from

Config [Optional]

Define custom formatters.


name description default optional / required
exe the name the formatter executable in the path n/a required
args list of arguments [] optional
replace overwrite the file, instead of updating the buffer 0 optional
stdin send data to the stdin of the formatter 0 optional
no_append do not append the path of the file to the formatter command, used when the path is in the middle of a command 0 optional
env list of environment variable definitions to be prepended to the formatter command [] optional
valid_exit_codes list of valid exit codes for formatters who do not respect common unix practices [0] optional


let g:neoformat_python_autopep8 = {
            \ 'exe': 'autopep8',
            \ 'args': ['-s 4', '-E'],
            \ 'replace': 1 " replace the file, instead of updating buffer (default: 0),
            \ 'stdin': 1, " send data to stdin of formatter (default: 0)
            \ 'env': ["DEBUG=1"], " prepend environment variables to formatter command
            \ 'valid_exit_codes': [0, 23],
            \ 'no_append': 1,
            \ }

let g:neoformat_enabled_python = ['autopep8']

Configure enabled formatters.

let g:neoformat_enabled_python = ['autopep8', 'yapf', 'docformatter']

Have Neoformat use &formatprg as a formatter

let g:neoformat_try_formatprg = 1

Enable basic formatting when a filetype is not found. Disabled by default.

" Enable alignment
let g:neoformat_basic_format_align = 1

" Enable tab to spaces conversion
let g:neoformat_basic_format_retab = 1

" Enable trimmming of trailing whitespace
let g:neoformat_basic_format_trim = 1

Run all enabled formatters (by default Neoformat stops after the first formatter succeeds)

let g:neoformat_run_all_formatters = 1

Above options can be activated or deactivated per buffer. For example:

    " runs all formatters for current buffer without tab to spaces conversion
    let b:neoformat_run_all_formatters = 1
    let b:neoformat_basic_format_retab = 0

Have Neoformat only msg when there is an error

let g:neoformat_only_msg_on_error = 1

When debugging, you can enable either of following variables for extra logging.

let g:neoformat_verbose = 1 " only affects the verbosity of Neoformat
" Or
let &verbose            = 1 " also increases verbosity of the editor as a whole

Adding a New Formatter

Note: you should replace everything {{ }} accordingly

  1. Create a file in autoload/neoformat/formatters/{{ filetype }}.vim if it does not already exist for your filetype.

  2. Follow the following format

See Config above for options

function! neoformat#formatters#{{ filetype }}#enabled() abort
    return ['{{ formatter name }}', '{{ other formatter name for filetype }}']

function! neoformat#formatters#{{ filetype }}#{{ formatter name }}() abort
    return {
        \ 'exe': '{{ formatter name }}',
        \ 'args': ['-s 4', '-q'],
        \ 'stdin': 1
        \ }

function! neoformat#formatters#{{ filetype }}#{{ other formatter name }}() abort
  return {'exe': {{ other formatter name }}

Managing Undo History

If you use an autocmd to run Neoformat on save, and you have your editor configured to save automatically on CursorHold then you might run into problems reverting changes. Pressing u will undo the last change made by Neoformat instead of the change that you made yourself - and then Neoformat will run again redoing the change that you just reverted. To avoid this problem you can run Neoformat with the Vim undojoin command to put changes made by Neoformat into the same undo-block with the preceding change. For example:

augroup fmt
  autocmd BufWritePre * undojoin | Neoformat
augroup END

When undojoin is used this way pressing u will "skip over" the Neoformat changes - it will revert both the changes made by Neoformat and the change that caused Neoformat to be invoked.

Supported Filetypes