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Interactive Coq Proofs in Vim
Python Vim script Shell
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Interactive Coq Proofs in Vim

Coqtail enables interactive Coq proof development in Vim similar to CoqIDE or ProofGeneral.

It supports:

Installation and Requirements

As a vim package:

mkdir -p ~/.vim/pack/coq/start
git clone ~/.vim/pack/coq/start/vimbufsync
git clone ~/.vim/pack/coq/start/coqtail
vim +helptags\ .vim/pack/coq/start/coqtail/doc +q

Using pathogen:

cd ~/.vim/bundle && git clone

Using Vundle:

Plugin 'whonore/coqtail' (in .vimrc)

Using VimPlug:

Plug 'whonore/coqtail' (in .vimrc)

Coqtail requires:

  • Vim compiled with either +python1 or +python3
  • Vim configuration options filetype plugin indent on and syntax on (e.g. in .vimrc)
  • vimbufsync
  • Coq 8.4 - 8.11

Newer versions of Coq have not yet been tested, but should still work as long as there are no major changes made to the XML protocol Coqtail uses to communicate with coqtop.

If you are using pathogen, documentation can be generated by :call pathogen#helptags(). Alternatively, you can do :helptags {path-to-coqtail}/doc.


Coqtail provides the following commands (see :help coqtail for more details):

Command Mapping Description
Starting and Stopping
CoqStart <leader>cc Launch Coqtail for the current buffer.
CoqStop <leader>cq Quit Coqtail for the current buffer.
{n}CoqNext <leader>cj Check the next n (1 by default) sentences with Coq.
{n}CoqUndo <leader>ck Step back n (1 by default) sentences.
{n}CoqToLine <leader>cl Check/rewind all sentences up to line n (cursor position by default). n can also be $ to check the entire buffer.
CoqToTop <leader>cT Rewind to the beginning of the file. Similar to 1CoqToLine, but CoqToLine only rewinds to the end of the line.
CoqJumpToEnd <leader>cG Move the cursor to the end of the checked region.
CoqGotoDef[!] <arg> <leader>cg Populate the quickfix list with possible locations of the definition of <arg> and try to jump to the first one.
Coq <args> Send arbitrary queries to Coq (e.g. Check, About, Print, etc.).
Coq Check <arg> <leader>ch Show the type of <arg> (the mapping will use the term under the cursor).
Coq About <arg> <leader>ca Show information about <arg>.
Coq Print <arg> <leader>cp Show the definition of <arg>.
Coq Locate <arg> <leader>cf Show where <arg> is defined.
Coq SearchAbout <args> <leader>cs Show theorems about <args>.
Goal Focusing
{n}CoqGotoGoal <leader>cgg Scroll the goal panel to the start of the nth goal (defaults to 1). Number of lines shown is controlled by g:coqtail_goal_lines.
{n}CoqGotoGoal! <leader>cGG Scroll the goal panel to the end of the nth goal.
CoqGotoGoalNext g] Scroll the goal panel to the start of the next goal.
CoqGotoGoalNext! G] Scroll the goal panel to the end of the next goal.
CoqGotoGoalPrev g[ Scroll the goal panel to the start of the previous goal.
CoqGotoGoalPrev! G[ Scroll the goal panel to the end of the previous goal.

The mappings shown above are set by default, but you can disable them all and define your own by setting g:coqtail_nomap = 1 in your .vimrc. Alternatively, you can choose to only remap specific commands and the defaults will still be used for the rest.

By default Coqtail will use the coqtop or coqtop.opt on your PATH. You can tell it to search instead in a specific directory by setting b:coqtail_coq_path before calling CoqStart. To set this option globally use g:coqtail_coq_path.

Coqtail also comes with an ftdetect script for Coq, as well as modified versions of Vincent Aravantinos' syntax and index scripts for Coq. These scripts are used by default but can be disabled by setting g:coqtail_nosyntax = 1 and g:coqtail_noindent = 1 respectively.


Parts of Coqtail were originally inspired by/adapted from Coquille (MIT License, Copyright (c) 2013, Thomas Refis).

Python 2 Support

Because Python 2 has reached its end-of-life and supporting it alongside Python 3 makes it difficult to improve and maintain the code, Coqtail will drop support for Python 2 in the near future. At that time a stable version will be tagged and all future versions will be Python 3-only.

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