*mini.pairs* Autopairs
*MiniPairs*

MIT License Copyright (c) 2021 Evgeni Chasnovski

==============================================================================

Features:
- Functionality to work with 'paired' characters conditional on cursor's
  neighborhood (two characters to its left and right).

- Usage should be through making appropriate mappings using |MiniPairs.map|
  or in |MiniPairs.setup| (for global mapping), |MiniPairs.map_buf| (for
  buffer mapping).

- Pairs get automatically registered to be recognized by `<BS>` and `<CR>`.

What it doesn't do:
- It doesn't support multiple characters as "open" and "close" symbols. Use
  snippets for that.

- It doesn't support dependency on filetype. Use |i_CTRL-V| to insert
  single symbol or `autocmd` command or 'after/ftplugin' approach to:
    - `:lua MiniPairs.map_buf(0, 'i', <*>, <pair_info>)` - make new mapping
      for '<*>' in current buffer.
    - `:lua MiniPairs.unmap_buf(0, 'i', <*>, <pair>)` - unmap key `<*>` while
      unregistering `<pair>` pair in current buffer. Note: this reverts
      mapping done by |MiniPairs.map_buf|. If mapping was done with
      |MiniPairs.map|, unmap for buffer in usual Neovim manner:
      `inoremap <buffer> <*> <*>` (this maps `<*>` key to do the same it
      does by default).
    - Disable module for buffer (see 'Disabling' section).

# Setup ~

This module needs a setup with `require('mini.pairs').setup({})`
(replace `{}` with your `config` table). It will create global Lua table
`MiniPairs` which you can use for scripting or manually (with
`:lua MiniPairs.*`).

See |MiniPairs.config| for `config` structure and default values.

This module doesn't have runtime options, so using `vim.b.minipairs_config`
will have no effect here.

# Example mappings ~
>lua
  -- Register quotes inside `config` of `MiniPairs.setup()`
  mappings = {
    ['"'] = { register = { cr = true } },
    ["'"] = { register = { cr = true } },
  }

  -- Insert `<>` pair if `<` is typed at line start, don't register for `<CR>`
  local lt_opts = {
    action = 'open',
    pair = '<>',
    neigh_pattern = '\r.',
    register = { cr = false },
  }
  MiniPairs.map('i', '<', lt_opts)

  local gt_opts = { action = 'close', pair = '<>', register = { cr = false } }
  MiniPairs.map('i', '>', gt_opts)

  -- Create symmetrical `$$` pair only in Tex files
  local map_tex = function()
    MiniPairs.map_buf(0, 'i', '$', { action = 'closeopen', pair = '$$' })
  end
  vim.api.nvim_create_autocmd(
    'FileType',
    { pattern = 'tex', callback = map_tex }
  )
<
# Notes ~

- Make sure to make proper mapping of `<CR>` in order to support completion
  plugin of your choice:
    - For |MiniCompletion| see 'Helpful key mappings' section.
    - For current implementation of "hrsh7th/nvim-cmp" there is no need to
      make custom mapping. You can use default setup, which will confirm
      completion selection if popup is visible and expand pair otherwise.
- Having mapping in terminal mode can conflict with:
    - Autopairing capabilities of interpretators (`ipython`, `radian`).
    - Vim mode of terminal itself.

# Disabling ~

To disable, set `vim.g.minipairs_disable` (globally) or `vim.b.minipairs_disable`
(for a buffer) to `true`. Considering high number of different scenarios
and customization intentions, writing exact rules for disabling module's
functionality is left to user. See |mini.nvim-disabling-recipes| for common
recipes.

------------------------------------------------------------------------------
                                                             *MiniPairs.setup()*
                          `MiniPairs.setup`({config})
Module setup

Parameters ~
{config} `(table|nil)` Module config table. See |MiniPairs.config|.

Usage ~
>lua
  require('mini.pairs').setup() -- use default config
  -- OR
  require('mini.pairs').setup({}) -- replace {} with your config table
<
------------------------------------------------------------------------------
                                                              *MiniPairs.config*
                               `MiniPairs.config`
Module config

Default values:
>lua
  MiniPairs.config = {
    -- In which modes mappings from this `config` should be created
    modes = { insert = true, command = false, terminal = false },

    -- Global mappings. Each right hand side should be a pair information, a
    -- table with at least these fields (see more in |MiniPairs.map|):
    -- - <action> - one of "open", "close", "closeopen".
    -- - <pair> - two character string for pair to be used.
    -- By default pair is not inserted after `\`, quotes are not recognized by
    -- `<CR>`, `'` does not insert pair after a letter.
    -- Only parts of tables can be tweaked (others will use these defaults).
    -- Supply `false` instead of table to not map particular key.
    mappings = {
      ['('] = { action = 'open', pair = '()', neigh_pattern = '[^\\].' },
      ['['] = { action = 'open', pair = '[]', neigh_pattern = '[^\\].' },
      ['{'] = { action = 'open', pair = '{}', neigh_pattern = '[^\\].' },

      [')'] = { action = 'close', pair = '()', neigh_pattern = '[^\\].' },
      [']'] = { action = 'close', pair = '[]', neigh_pattern = '[^\\].' },
      ['}'] = { action = 'close', pair = '{}', neigh_pattern = '[^\\].' },

      ['"'] = { action = 'closeopen', pair = '""', neigh_pattern = '[^\\].',   register = { cr = false } },
      ["'"] = { action = 'closeopen', pair = "''", neigh_pattern = '[^%a\\].', register = { cr = false } },
      ['`'] = { action = 'closeopen', pair = '``', neigh_pattern = '[^\\].',   register = { cr = false } },
    },
  }
<
------------------------------------------------------------------------------
                                                               *MiniPairs.map()*
              `MiniPairs.map`({mode}, {lhs}, {pair_info}, {opts})
Make global mapping

This is a wrapper for |nvim_set_keymap()| but instead of right hand side of
mapping (as string) it expects table with pair information.

Using this function instead of |nvim_set_keymap()| allows automatic
registration of pairs which will be recognized by `<BS>` and `<CR>`.
It also infers mapping description from `pair_info`.

Parameters ~
{mode} `(string)` `mode` for |nvim_set_keymap()|.
{lhs} `(string)` `lhs` for |nvim_set_keymap()|.
{pair_info} `(table)` Table with pair information. Fields:
  - <action> - one of "open" (for |MiniPairs.open|),
    "close" (for |MiniPairs.close|), or "closeopen" (for |MiniPairs.closeopen|).
  - <pair> - two character string to be used as argument for action function.
  - <neigh_pattern> - optional 'two character' neighborhood pattern to be
    used as argument for action function.
    Default: `'..'` (no restriction from neighborhood).
  - <register> - optional table with information about whether this pair will
    be recognized by `<BS>` (in |MiniPairs.bs|) and/or `<CR>` (in |MiniPairs.cr|).
    Should have boolean fields <bs> and <cr> which are both `true` by
    default (if not overridden explicitly).
{opts} `(table|nil)` Optional table `opts` for |nvim_set_keymap()|. Elements
  `expr` and `noremap` won't be recognized (`true` by default).

------------------------------------------------------------------------------
                                                           *MiniPairs.map_buf()*
       `MiniPairs.map_buf`({buffer}, {mode}, {lhs}, {pair_info}, {opts})
Make buffer mapping

This is a wrapper for |nvim_buf_set_keymap()| but instead of string right
hand side of mapping it expects table with pair information similar to one
in |MiniPairs.map|.

Using this function instead of |nvim_buf_set_keymap()| allows automatic
registration of pairs which will be recognized by `<BS>` and `<CR>`.
It also infers mapping description from `pair_info`.

Parameters ~
{buffer} `(number)` `buffer` for |nvim_buf_set_keymap()|.
{mode} `(string)` `mode` for |nvim_buf_set_keymap()|.
{lhs} `(string)` `lhs` for |nvim_buf_set_keymap()|.
{pair_info} `(table)` Table with pair information.
{opts} `(table|nil)` Optional table `opts` for |nvim_buf_set_keymap()|.
  Elements `expr` and `noremap` won't be recognized (`true` by default).

------------------------------------------------------------------------------
                                                             *MiniPairs.unmap()*
                    `MiniPairs.unmap`({mode}, {lhs}, {pair})
Remove global mapping

A wrapper for |nvim_del_keymap()| which registers supplied `pair`.

Parameters ~
{mode} `(string)` `mode` for |nvim_del_keymap()|.
{lhs} `(string)` `lhs` for |nvim_del_keymap()|.
{pair} `(string)` Pair which should be unregistered from both
  `<BS>` and `<CR>`. Should be explicitly supplied to avoid confusion.
  Supply `''` to not unregister pair.

------------------------------------------------------------------------------
                                                         *MiniPairs.unmap_buf()*
             `MiniPairs.unmap_buf`({buffer}, {mode}, {lhs}, {pair})
Remove buffer mapping

Wrapper for |nvim_buf_del_keymap()| which also unregisters supplied `pair`.

Note: this only reverts mapping done by |MiniPairs.map_buf|. If mapping was
done with |MiniPairs.map|, revert to default behavior for buffer: >lua

  -- Map `X` key to do the same it does by default
  vim.keymap.set('i', 'X', 'X', { buffer = true })
<
Parameters ~
{buffer} `(number)` `buffer` for |nvim_buf_del_keymap()|.
{mode} `(string)` `mode` for |nvim_buf_del_keymap()|.
{lhs} `(string)` `lhs` for |nvim_buf_del_keymap()|.
{pair} `(string)` Pair which should be unregistered from both
  `<BS>` and `<CR>`. Should be explicitly supplied to avoid confusion.
  Supply `''` to not unregister pair.

------------------------------------------------------------------------------
                                                              *MiniPairs.open()*
                   `MiniPairs.open`({pair}, {neigh_pattern})
Process "open" symbols

Used as |map-expr| mapping for "open" symbols in asymmetric pair ('(', '[',
etc.). If neighborhood doesn't match supplied pattern, function results
into "open" symbol. Otherwise, it pastes whole pair and moves inside pair
with |<Left>|.

Used inside |MiniPairs.map| and |MiniPairs.map_buf| for an actual mapping.

Parameters ~
{pair} `(string)` String with two characters representing pair.
{neigh_pattern} `(string|nil)` Pattern for two neighborhood characters.
  Character "\r" indicates line start, "\n" - line end.

Return ~
`(string)` Keys performing "open" action.

------------------------------------------------------------------------------
                                                             *MiniPairs.close()*
                   `MiniPairs.close`({pair}, {neigh_pattern})
Process "close" symbols

Used as |map-expr| mapping for "close" symbols in asymmetric pair (')',
']', etc.). If neighborhood doesn't match supplied pattern, function
results into "close" symbol. Otherwise it jumps over symbol to the right of
cursor (with |<Right>|) if it is equal to "close" one and inserts it
otherwise.

Used inside |MiniPairs.map| and |MiniPairs.map_buf| for an actual mapping.

Parameters ~
{pair} `(string)` String with two characters representing pair.
{neigh_pattern} `(string|nil)` Pattern for two neighborhood characters.
  Character "\r" indicates line start, "\n" - line end.

Return ~
`(string)` Keys performing "close" action.

------------------------------------------------------------------------------
                                                         *MiniPairs.closeopen()*
                 `MiniPairs.closeopen`({pair}, {neigh_pattern})
Process "closeopen" symbols

Used as |map-expr| mapping for 'symmetrical' symbols (from pairs '""',
'\'\'', '``').  It tries to perform 'closeopen action': move over right
character (with |<Right>|) if it is equal to second character from pair or
conditionally paste pair otherwise (with |MiniPairs.open()|).

Used inside |MiniPairs.map| and |MiniPairs.map_buf| for an actual mapping.

Parameters ~
{pair} `(string)` String with two characters representing pair.
{neigh_pattern} `(string|nil)` Pattern for two neighborhood characters.
  Character "\r" indicates line start, "\n" - line end.

Return ~
`(string)` Keys performing "closeopen" action.

------------------------------------------------------------------------------
                                                                *MiniPairs.bs()*
                             `MiniPairs.bs`({key})
Process |<BS>|

Used as |map-expr| mapping for `<BS>` in Insert mode. It removes whole pair
(via executing `<Del>` after input key) if neighborhood is equal to a whole
pair recognized for current buffer. Pair is recognized for current buffer
if it is registered for global or current buffer mapping. Pair is
registered as a result of calling |MiniPairs.map| or |MiniPairs.map_buf|.

Mapped by default inside |MiniPairs.setup|.

This can be used to modify other Insert mode keys to respect neighborhood
pair. Examples: >lua

  local map_bs = function(lhs, rhs)
    vim.keymap.set('i', lhs, rhs, { expr = true, replace_keycodes = false })
  end

  map_bs('<C-h>', 'v:lua.MiniPairs.bs()')
  map_bs('<C-w>', 'v:lua.MiniPairs.bs("\23")')
  map_bs('<C-u>', 'v:lua.MiniPairs.bs("\21")')
<
Parameters ~
{key} `(string|nil)` Key to use. Default: `<BS>`.

Return ~
`(string)` Keys performing "backspace" action.

------------------------------------------------------------------------------
                                                                *MiniPairs.cr()*
                             `MiniPairs.cr`({key})
Process |i_<CR>|

Used as |map-expr| mapping for `<CR>` in insert mode. It puts "close"
symbol on next line (via `<CR><C-o>O`) if neighborhood is equal to a whole
pair recognized for current buffer. Pair is recognized for current buffer
if it is registered for global or current buffer mapping. Pair is
registered as a result of calling |MiniPairs.map| or |MiniPairs.map_buf|.

Note: some relevant mode changing events are temporarily ignored
(with |eventignore|) to counter effect of using |i_CTRL-O|.

Mapped by default inside |MiniPairs.setup|.

Parameters ~
{key} `(string|nil)` Key to use. Default: `<CR>`.

Return ~
`(string)` Keys performing "new line" action.


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