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Vim mode for Idris 2
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edwinb Merge pull request #2 from ziman/absolute-paths
Use absolute paths to invoke Idris2
Latest commit 0fd4094 Apr 1, 2020


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doc Initial version Feb 22, 2020
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ftplugin Use absolute paths to invoke Idris2. Mar 29, 2020
indent Initial version Feb 22, 2020
syntax Update README slightly Feb 22, 2020
syntax_checkers/idris2 fix references to idris1(-mode) Mar 10, 2020

Idris 2 mode for vim

This is an Idris2 mode for vim which features interactive editing, syntax highlighting, indentation and optional syntax checking via Syntastic. If you need a REPL I recommend using Vimshell. It is mostly cloned from the original idris-mode. Unlike the Idris 1 mode, there is no need to have an Idris REPL running - it invokes Idris 2 directly.

If there is a .ipkg file in any of the parent directories, the mode will use that as the root of the source tree, and process any options declared in it (for example, to load packages).

Not all of the commands work yet. Note that the keyboard shortcuts have been updated since Idris 1 to be consistent with the Atom mode (e.g. <LocalLeader>a to add definition, rather than <LocalLeader>d) although the old shortcuts still work.



I recommend using Pathogen for installation. Simply clone this repo into your ~/.vim/bundle directory and you are ready to go.

cd ~/.vim/bundle
git clone

Manual Installation

Copy content into your ~/.vim directory.

Be sure that the following lines are in your .vimrc

syntax on
filetype on
filetype plugin indent on


Apart from syntax highlighting, indentation, and unicode character concealing, idris-vim offers some neat interactive editing features. For more information on how to use it, read this blog article by Edwin Brady on Interactive Idris editing with vim.

Interactive Editing Commands

Idris2 mode for vim offers interactive editing capabilities, the following commands are supported.

<LocalLeader>r reload file

<LocalLeader>t show type

<LocalLeader>a Create an initial clause for a type declaration.

<LocalLeader>c case split

<LocalLeader>mc make case

<LocalLeader>w add with clause

<LocalLeader>e evaluate expression

<LocalLeader>l make lemma

<LocalLeader>m add missing clause

<LocalLeader>f refine item

<LocalLeader>o obvious proof search

<LocalLeader>s proof search

<LocalLeader>i open idris response window

<LocalLeader>d show documentation



To configure indentation in idris-vim you can use the following variables:

  • let g:idris_indent_if = 3

      if bool
      >>>then ...
      >>>else ...
  • let g:idris_indent_case = 5

      case xs of
      >>>>>[]      => ...
      >>>>>(y::ys) => ...
  • let g:idris_indent_let = 4

      let x = 0 in
  • let g:idris_indent_where = 6

      where f : Int -> Int
      >>>>>>f x = x
  • let g:idris_indent_do = 3

      do x <- a
      >>>y <- b
  • let g:idris_indent_rewrite = 8

      rewrite prf in expr


Concealing with unicode characters is off by default, but let g:idris_conceal = 1 turns it on.

Tab Characters

If you simply must use tab characters, and would prefer that the ftplugin not set expandtab add let g:idris_allow_tabchar = 1.

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