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255 lines (212 loc) · 8.27 KB
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-- MIT License Copyright (c) 2021 Evgeni Chasnovski
-- Documentation ==============================================================
--- Buffer removing (unshow, delete, wipeout), which saves window layout
--- (opposite to builtin Neovim's commands).
---
--- # Setup~
---
--- This module doesn't need setup, but it can be done to improve usability.
--- Setup with `require('mini.bufremove').setup({})` (replace `{}` with your
--- `config` table). It will create global Lua table `MiniBufremove` which you
--- can use for scripting or manually (with `:lua MiniBufremove.*`).
---
--- See |MiniBufremove.config| for `config` structure and default values.
---
--- This module doesn't have runtime options, so using `vim.b.minibufremove_config`
--- will have no effect here.
---
--- # Notes~
---
--- 1. Which buffer to show in window(s) after its current buffer is removed is
--- decided by the algorithm:
--- - If alternate buffer (see |CTRL-^|) is listed (see |buflisted()|), use it.
--- - If previous listed buffer (see |bprevious|) is different, use it.
--- - Otherwise create a scratch one with `nvim_create_buf(true, true)` and use
--- it.
---
--- # Disabling~
---
--- To disable core functionality, set `g:minibufremove_disable` (globally) or
--- `b:minibufremove_disable` (for a buffer) to `v: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.
---@tag mini.bufremove
---@tag MiniBufremove
-- Module definition ==========================================================
local MiniBufremove = {}
local H = {}
--- Module setup
---
---@param config table Module config table. See |MiniBufremove.config|.
---
---@usage `require('mini.bufremove').setup({})` (replace `{}` with your `config` table)
MiniBufremove.setup = function(config)
-- Export module
_G.MiniBufremove = MiniBufremove
-- Setup config
config = H.setup_config(config)
-- Apply config
H.apply_config(config)
end
--- Module config
---
--- Default values:
---@eval return MiniDoc.afterlines_to_code(MiniDoc.current.eval_section)
MiniBufremove.config = {
-- Whether to set Vim's settings for buffers (allow hidden buffers)
set_vim_settings = true,
}
--minidoc_afterlines_end
-- Module functionality =======================================================
--- Delete buffer `buf_id` with |:bdelete| after unshowing it
---
---@param buf_id number Buffer identifier (see |bufnr()|) to use. Default:
--- 0 for current.
---@param force boolean Whether to ignore unsaved changes (using `!` version of
--- command). Default: `false`.
---
---@return boolean Whether operation was successful.
MiniBufremove.delete = function(buf_id, force)
if H.is_disabled() then return end
return H.unshow_and_cmd(buf_id, force, 'bdelete')
end
--- Wipeout buffer `buf_id` with |:bwipeout| after unshowing it
---
---@param buf_id number Buffer identifier (see |bufnr()|) to use. Default:
--- 0 for current.
---@param force boolean Whether to ignore unsaved changes (using `!` version of
--- command). Default: `false`.
---
---@return boolean Whether operation was successful.
MiniBufremove.wipeout = function(buf_id, force)
if H.is_disabled() then return end
return H.unshow_and_cmd(buf_id, force, 'bwipeout')
end
--- Stop showing buffer `buf_id` in all windows
---
---@param buf_id number Buffer identifier (see |bufnr()|) to use. Default:
--- 0 for current.
---
---@return boolean Whether operation was successful.
MiniBufremove.unshow = function(buf_id)
if H.is_disabled() then return end
buf_id = H.normalize_buf_id(buf_id)
if not H.is_valid_id(buf_id, 'buffer') then return false end
vim.tbl_map(MiniBufremove.unshow_in_window, vim.fn.win_findbuf(buf_id))
return true
end
--- Stop showing current buffer of window `win_id`
---
---@param win_id number Window identifier (see |win_getid()|) to use.
--- Default: 0 for current.
---
---@return boolean Whether operation was successful.
MiniBufremove.unshow_in_window = function(win_id)
if H.is_disabled() then return nil end
win_id = (win_id == nil) and 0 or win_id
if not H.is_valid_id(win_id, 'window') then return false end
local cur_buf = vim.api.nvim_win_get_buf(win_id)
-- Temporary use window `win_id` as current to have Vim's functions working
vim.api.nvim_win_call(win_id, function()
-- Try using alternate buffer
local alt_buf = vim.fn.bufnr('#')
if alt_buf ~= cur_buf and vim.fn.buflisted(alt_buf) == 1 then
vim.api.nvim_win_set_buf(win_id, alt_buf)
return
end
-- Try using previous buffer
vim.cmd('bprevious')
if cur_buf ~= vim.api.nvim_win_get_buf(win_id) then return end
-- Create new listed scratch buffer
local new_buf = vim.api.nvim_create_buf(true, true)
vim.api.nvim_win_set_buf(win_id, new_buf)
end)
return true
end
-- Helper data ================================================================
-- Module default config
H.default_config = MiniBufremove.config
-- Helper functionality =======================================================
-- Settings -------------------------------------------------------------------
H.setup_config = function(config)
-- General idea: if some table elements are not present in user-supplied
-- `config`, take them from default config
vim.validate({ config = { config, 'table', true } })
config = vim.tbl_deep_extend('force', H.default_config, config or {})
vim.validate({ set_vim_settings = { config.set_vim_settings, 'boolean' } })
return config
end
H.apply_config = function(config)
MiniBufremove.config = config
if config.set_vim_settings then
vim.o.hidden = true -- Allow hidden buffers
end
end
H.is_disabled = function() return vim.g.minibufremove_disable == true or vim.b.minibufremove_disable == true end
-- Removing implementation ----------------------------------------------------
H.unshow_and_cmd = function(buf_id, force, cmd)
buf_id = H.normalize_buf_id(buf_id)
if not H.is_valid_id(buf_id, 'buffer') then
H.message(buf_id .. ' is not a valid buffer id.')
return false
end
if force == nil then force = false end
if type(force) ~= 'boolean' then
H.message('`force` should be boolean.')
return false
end
local fun_name = ({ ['bdelete'] = 'delete', ['bwipeout'] = 'wipeout' })[cmd]
if not H.can_remove(buf_id, force, fun_name) then return false end
-- Unshow buffer from all windows
MiniBufremove.unshow(buf_id)
-- Execute command
local command = string.format('%s%s %d', cmd, force and '!' or '', buf_id)
-- Use `pcall` here to take care of case where `unshow()` was enough. This
-- can happen with 'bufhidden' option values:
-- - If `delete` then `unshow()` already `bdelete`d buffer. Without `pcall`
-- it gives E516 for `MiniBufremove.delete()` (`wipeout` works).
-- - If `wipe` then `unshow()` already `bwipeout`ed buffer. Without `pcall`
-- it gives E517 for module's `wipeout()` (still E516 for `delete()`).
local ok, result = pcall(vim.cmd, command)
if not (ok or result:find('E516') or result:find('E517')) then
H.message(result)
return false
end
return true
end
-- Utilities ------------------------------------------------------------------
H.is_valid_id = function(x, type)
local is_valid = false
if type == 'buffer' then
is_valid = vim.api.nvim_buf_is_valid(x)
elseif type == 'window' then
is_valid = vim.api.nvim_win_is_valid(x)
end
if not is_valid then H.message(string.format('%s is not a valid %s id.', tostring(x), type)) end
return is_valid
end
-- Check if buffer can be removed with `MiniBufremove.fun_name` function
H.can_remove = function(buf_id, force, fun_name)
if force then return true end
if vim.api.nvim_buf_get_option(buf_id, 'modified') then
H.message(
string.format(
'Buffer %d has unsaved changes. Use `MiniBufremove.%s(%d, true)` to force.',
buf_id,
fun_name,
buf_id
)
)
return false
end
return true
end
-- Compute 'true' buffer id (strictly positive integer). Treat `nil` and 0 as
-- current buffer.
H.normalize_buf_id = function(buf_id)
if buf_id == nil or buf_id == 0 then return vim.api.nvim_get_current_buf() end
return buf_id
end
H.message = function(msg) vim.cmd('echomsg ' .. vim.inspect('(mini.bufremove) ' .. msg)) end
return MiniBufremove