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Read–Eval–Print Loop (REPL), also known as an interactive toplevel or language shell, is extremely useful in python coding. However, it's difficult to interact with REPL when writing python with vim. Therefore, I write this plugin to provide a better repl environment for coding python or other file in vim. It use the terminal feature for vim8. So your vim version must be no less than 8.0 and support termianl function to use this plugin.

如果您想阅读中文文档，请移步：知乎-vim-repl

Details

Use vim to open a file, run :REPLToggle to open the REPL environment. If the REPL is already open. :REPLToggle will close REPL.

By default, Python Perl and Vimscript are supported. If you run :REPLToggle in a python file, you will get python in the terminal buffer. In a perl file, vim-repl will try to use perlconsole, reply and re.pl (in that order); so one of them should be installed. In a vim file, vim-repl will try to open vim -e. In order to support more languages, you will have to specify which program to run for each specific filetype.

There are three ways to send codes to REPL environment:

the first way: stay in normal mode and press <leader>w and the whole line of the cursor will be sent to REPL.

The second way is that in normal mode, move the cursor to the first line of one block (start of a function: def functionname(argv):, start of a for/while loop, start of a if-else statement) and press <leader>w, the whole block will be sent to REPL automatically.

The third way is to select some lines in visual mode and press <leader>w, the seleted code will be sent to REPL.

The last way is to select some word in visual mode and press <leader>w and the selected word will be sent to REPL.

Installation

This plugin support all platforms (Windows, MacOS, Linux). Use your plugin manager of choice.

For MacOS, Windows and Linux Users (vim should have +terminal and +timers support):

vim-plug (recommended)
- Add Plug 'sillybun/vim-repl' to .vimrc
- Run :PlugInstall

Usage

How to open REPL

:REPLToggle

How to exit REPL

:REPLToggle

If you bind <lead>r to :REPLToggle by nnoremap <leader>r :REPLToggle, you only need to press <leader>r to open or close REPL.

leader key is set by let g:mapleader=' '

How to send code to REPL

In Normal Mode, press <leader>w, code in the current line (including leading space and the end center) will be transmitted to REPL
In Normal Mode, move the cursor to the begin of a block and press <leader>w and the whole block will be sent to REPL (By default, code block start with def, class, while, for, if will be automatically sent. You can control the definition of start of code block by setting g:repl_auto_sends)
In Visual Mode, press <leader>w, selected code (whole line includeing leading space and the last center) will be trasmitted to REPL
In Visual Mode, selected a word and press <leader>w, and the selected word will be sent to REPL according to certain rules defined by g:repl_sendvariable_template.

Currently, asynchronous transmission is completed and it is supported for all language if you correctly set the input symbols of the corresponding language. Setting for python is already done by author. Supported command shell for python include python, ipython and ptpython.

Take a typical python REPL environment as an example

>>> 1+1
2
>>> for i in range(3):
...     print(i)
...
>>>

Therefore, the input symbols for python includes '>>>' and '...'. They tell the plugin that it can continue send another line to the REPL environment if the current line of the REPL environment is either '>>>' or '...'. If you want async support for other language aside from python, you have to add entry for this language to g:repl_input_symbols

The default value of g:repl_input_symbols is, the value of the dictionary can be either a list of string or a string:

let g:repl_input_symbols = {
            \   'python': ['>>>', '>>>>', 'ipdb>', 'pdb', '...'],
            \   }

How to switch to REPL environment

You can switch buffer between file and REPL environment the same as change between two vim buffer. press <C-W><C-w> will change between file and REPL environment. <C-w><C-h,j,k,l> also work the way it should be

How to hide the REPL environment

:REPLHide

use REPLUnhide or REPLToggle to reveal the hidden terminal.

How to debug python script?

You should have to install ipdb to debug python script.

I suggest the following key binding:

autocmd Filetype python nnoremap <F12> <Esc>:REPLDebugStopAtCurrentLine<Cr>
autocmd Filetype python nnoremap <F10> <Esc>:REPLPDBN<Cr>
autocmd Filetype python nnoremap <F11> <Esc>:REPLPDBS<Cr>

To debug python code, move the cursor to certain line and press <F12>, and ipdb will be run and the program will be stopped at that line. Press <F10> will run a single line and Press <F11> will also run a single line but will jump into functions.

How to send code block to REPL?

For python code, surround code block with # BEGIN and # END:

# BEGIN <name of block or just empty>

block-of-code

# END <you can add whatever you like here>

Example:

# BEGIN header
import numpy as np
import os

def f(a, b):
    return a + b
# END

Place the cursor in the code block and run command :REPLSendSession and then the whole block will be sent to the REPL environment.

How to open python with virtual environment?

There are two ways to open python with virtual environment.

The first method (global) is that put:

g:repl_python_pre_launch_command = 'source /path_to_new_venv/bin/activate'

in .vimrc. And once you toggle python, the following command will be run:

:terminal [g:repl_program['default'][0]/bash/cmd.exe]
source /path_to_new_venv/bin/activate
python/ipython/ptpython

The second method (specific virtual environment) is that put:

#REPLENV: /path_to_new_venv/bin/activate

in python script. If you open this python file with vim and toggle vim-repl, python will be run in specific virtual environment.

Setting

you can bind the REPLToggle command to a certain key to make it more convenience.

nnoremap <leader>r :REPLToggle<Cr>

g:repl_width

it represents the width of REPL windows. there is no default value.

g:sendtorepl_invoke_key

you can customize the key to send code to REPL environment. The default key is <leader>w

let g:sendtorepl_invoke_key = "<leader>w"

repl_position it controls the location where REPL windows will appear

0 represents bottom
1 represents top
2 represents left
3 represents right

let g:repl_position = 0

repl_stayatrepl_when_open

it controls whether the cursor will return to the current buffer or just stay at the REPL environment when open REPL environment using REPLToggle command

0 represents return back to current file.

1 represents stay in REPL environment.

let g:repl_stayatrepl_when_open = 0

repl_program

It controls which program will be run for certain filetype. If there is no entry in the dictionary, the program specified by "default" will be run. If there is no "default" entry, "bash" will be the choice.

let g:repl_program = {
			\	'python': ['python'],
			\	'default': ['bash']
			\	}

For those who use ipython as REPL program: Since ipython 7 and ipython 6 have a big difference, I have to treat them seperately and have to detect the version of ipython by ipython --version which will cause a obvious lagging. You have better to specify version of ipython by setting:

let g:repl_ipython_version = '6'

let g:repl_ipython_version = '7.7'

I have tested some version of ipython and find that this plugin cannot work on 7.0.1. Please use version >= 7.1.1

repl_exit_command

It controls the command to exit different repl program correctly. (Notice: exitcommand depends on repl program not filetype of the current file, so if you want to specify exit command for program like 'ipython', please add "ipython": "quit()" in the dictionary)

let g:repl_exit_commands = {
			\	'python': 'quit()',
			\	'bash': 'exit',
			\	'zsh': 'exit',
			\	'default': 'exit',
			\	}

Once user run :REPLToggle when the REPL environment is already open, this plugin will try to close the repl environment by the following step:

send a interupt signal <C-C> to the program
if the program is not close, then send two \n and the exit_command + \n to the program.

let g:repl_auto_sends = ['class ', 'def ', 'for ', 'if ', 'while ', 'with ']

If g:repl_auto_sends is defined, once user sends a line starts with any pattern contained in the list, whole block will be send automatically.

let g:repl_cursor_down = 1

If g:repl_cursor_down is 1, once user sends code blocks using visual selection, the cursor will move to the next line of the last line of the code blocks.

let g:repl_python_auto_import = 1

If g:repl_python_auto_import is 1, once user toggle python REPL environment, all import code will be automatically send to the REPL environment

let g:repl_python_automerge = 0

If g:repl_python_automerge is 1, once user sends code which is seperated into multilines, they are combined into one line automatically. For example, if the code is:

a = 1+\
    2+\
    3

, then a = 1+2+3 will be sent to the repl environment instead of three lines.

let g:repl_console_name = 'ZYTREPL'

represents the name for repl console.

let g:repl_vimscript_engine = 0

If your vim doesn't support python or python3, I provides limited supported for it:

It works for python and ipython
It also works for ptpython but every line of the codes to be send should be complete, which means if you seperate a line of code into two or more lines, the plugin will not handle it correctly.

let g:repl_sendvariable_template = {
            \ 'python': 'print(<input>)',
            \ 'ipython': 'print(<input>)',
            \ 'ptpython': 'print(<input>)',
            \ }

g:repl_sendvariable_template defines how word is sent to REPL. For example, by default, if you select some_variable and presss <leader>w, print(some_variable) will be sent to REPL. You can define your rule with the help of g:repl_sendvariable_template. <input> will be replaced by selected word and then be sent to REPL.

let g:repl_unhide_when_send_lines = 0

If g:repl_unhide_when_send_lines = 1, when REPL is hidden and you want to send lines, REPL environment will be unhiden before the code is sent.

g:repl_output_copy_to_register

If g:repl_output_copy_to_register is set to a letter (a-z), then output of REPL program will be copied to the corresponding register. (Currently only support ipython)

My Configuration for Vim-Repl

Plug 'sillybun/vim-repl'
let g:repl_program = {
            \   'python': 'ipython',
            \   'default': 'zsh',
            \   'r': 'R',
            \   'lua': 'lua',
            \   'vim': 'vim -e',
            \   }
let g:repl_predefine_python = {
            \   'numpy': 'import numpy as np',
            \   'matplotlib': 'from matplotlib import pyplot as plt'
            \   }
let g:repl_cursor_down = 1
let g:repl_python_automerge = 1
let g:repl_ipython_version = '7'
let g:repl_output_copy_to_register = "t"
nnoremap <leader>r :REPLToggle<Cr>
nnoremap <leader>e :REPLSendSession<Cr>
autocmd Filetype python nnoremap <F12> <Esc>:REPLDebugStopAtCurrentLine<Cr>
autocmd Filetype python nnoremap <F10> <Esc>:REPLPDBN<Cr>
autocmd Filetype python nnoremap <F11> <Esc>:REPLPDBS<Cr>
let g:repl_position = 3

Updates

2020.10.22

Add support for auto import package for python file
Add support for import from relative path. For example, if in package 'python_package', there are two file 'a.py' and 'b.py' and a __init__.py. If you import 'B.py' in 'A.py' through import .B. Then if you edit A.py using vim and run vim-repl. import .B will be automatically transformed into import python_package.B and be sent to REPL environment.

2020.4.29

Add support for mulitiple repl program. Thanks to @roachsinai 's great work.

2019.10.14

Add support for python virtual environment.

2019.8.27

Set the default program in Windows to cmd.exe

2019.8.16

Add support for vimscript REPL.

2019.8.11

Add send selected word function and g:repl_sendvariable_template.

2019.8.10

vim-repl no longer need the support of vim-async anymore.

2019.8.9

Add almost full support for vim without +python or +python3 support.
Rewrite vim-async using timer_start
Set the default value of g:repl_auto_sends to ['class ', 'def ', 'for ', 'if ', 'while ']
Set the default value of g:repl_cursor_down to 1

2019.8.7

Fix bug for windows
g:repl_cursor_down will also affect SendCurrentLine

2019.8.6

Add support for ipython version >= 7

2019.8.3

Rewrite the program to format python codes using python language
Abandon using C++ to handle python code
g:repl_python_automerge is provided.
g:repl_console_name is provided
Support both python and python3
Remove Checkpoint function

2019.5.28

Support REPL environment for Windows.

2019.5.14

g:repl_cursor_down is provided.

2019.4.27

Async feature is provided by vim-async

2018.7.7

Use job feature in vim 8.0 to provide better performance.

2018.7.26

Add support for temporary hide the terminal window. If the REPL is already open. :REPLToggle will close REPL.

Troubleshooting

The python code cannot send porperly to REPL environment

This trouble cann only happen for vim without +python or +python3 support. Without python engine, vim-repl can only use vimscript to manipulate code to be sent, and it now cannot handle code seperated into multilines. For example, the following code cannot be sent porperly.

some_dict = {1:1,
        2:2,
        3:3}
print(some_dict)

You should combine mulitlines code into one line to make the plugin work porperly as following:

some_dict = {1:1, 2:2, 3:3}
print(some_dict)

For vim with +python or +python3 support, this problem will not happen. If it happens, check whether g:repl_vimscript_engine is set to 0. If g:repl_vimscript_engine = 0, there is a bug here. Please report the bug; If g:repl_vimscript_engine=1, search let g:repl_vimscript_engine = 1 in vimrc and remove it.

<space>r doesn't work for my vim

<space> in the example mean the leader key. Check the your leader key mapping in vimrc. To set leader key to <space>, add let g:mapleader=' '

Error detected while processing function repl#REPLToggle [10].. repl #REPLOpen

The reason of this error is that vim-repl try to open the program which is not installed on your machine. For example, if you havn't install ipython and set g:repl_program['python']=['ipython'], this error will occur.

How to change to Normal Mode in REPL environment?

In REPL environment, press <C-W>N. Or you can use the setting:

tnoremap <C-n> <C-w>N
tnoremap <ScrollWheelUp> <C-w>Nk
tnoremap <ScrollWheelDown> <C-w>Nj

And then you can press <C-n> to change to Normal Mode.

If you like my plugin, please give me a star!

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