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--- *mini.misc* Miscellaneous functions
--- *MiniMisc*
---
--- MIT License Copyright (c) 2021 Evgeni Chasnovski
---
--- ==============================================================================
---
--- Features the following functions:
--- - |MiniMisc.bench_time()| to benchmark function execution time.
--- Useful in combination with `stat_summary()`.
---
--- - |MiniMisc.put()| and |MiniMisc.put_text()| to pretty print its arguments
--- into command line and current buffer respectively.
---
--- - |MiniMisc.setup_auto_root()| to set up automated change of current directory.
---
--- - |MiniMisc.setup_termbg_sync()| to set up terminal background synchronization
--- (removes possible "frame" around current Neovim instance).
---
--- - |MiniMisc.setup_restore_cursor()| to set up automated restoration of
--- cursor position on file reopen.
---
--- - |MiniMisc.stat_summary()| to compute summary statistics of numerical array.
--- Useful in combination with `bench_time()`.
---
--- - |MiniMisc.tbl_head()| and |MiniMisc.tbl_tail()| to return "first" and "last"
--- elements of table.
---
--- - |MiniMisc.zoom()| to zoom in and out of a buffer, making it full screen
--- in a floating window.
---
--- - And more.
---
--- # Setup ~
---
--- This module doesn't need setup, but it can be done to improve usability.
--- Setup with `require('mini.misc').setup({})` (replace `{}` with your
--- `config` table). It will create global Lua table `MiniMisc` which you can
--- use for scripting or manually (with `:lua MiniMisc.*`).
---
--- See |MiniMisc.config| for `config` structure and default values.
---
--- This module doesn't have runtime options, so using `vim.b.minimisc_config`
--- will have no effect here.
-- Module definition ==========================================================
local MiniMisc = {}
local H = {}
--- Module setup
---
---@param config table|nil Module config table. See |MiniMisc.config|.
---
---@usage >lua
--- require('mini.misc').setup() -- use default config
--- -- OR
--- require('mini.misc').setup({}) -- replace {} with your config table
--- <
MiniMisc.setup = function(config)
-- Export module
_G.MiniMisc = MiniMisc
-- 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)
MiniMisc.config = {
-- Array of fields to make global (to be used as independent variables)
make_global = { 'put', 'put_text' },
}
--minidoc_afterlines_end
-- Module functionality =======================================================
--- Execute `f` several times and time how long it took
---
---@param f function Function which execution to benchmark.
---@param n number|nil Number of times to execute `f(...)`. Default: 1.
---@param ... any Arguments when calling `f`.
---
---@return ... Table with durations (in seconds; up to nanoseconds) and
--- output of (last) function execution.
MiniMisc.bench_time = function(f, n, ...)
n = n or 1
local durations, output = {}, nil
for _ = 1, n do
local start_time = vim.loop.hrtime()
output = f(...)
local end_time = vim.loop.hrtime()
table.insert(durations, 0.000000001 * (end_time - start_time))
end
return durations, output
end
--- Compute width of gutter (info column on the left of the window)
---
---@param win_id number|nil Window identifier (see |win_getid()|) for which gutter
--- width is computed. Default: 0 for current.
MiniMisc.get_gutter_width = function(win_id)
win_id = (win_id == nil or win_id == 0) and vim.api.nvim_get_current_win() or win_id
return vim.fn.getwininfo(win_id)[1].textoff
end
--- Print Lua objects in command line
---
---@param ... any Any number of objects to be printed each on separate line.
MiniMisc.put = function(...)
local objects = {}
-- Not using `{...}` because it removes `nil` input
for i = 1, select('#', ...) do
local v = select(i, ...)
table.insert(objects, vim.inspect(v))
end
print(table.concat(objects, '\n'))
return ...
end
--- Print Lua objects in current buffer
---
---@param ... any Any number of objects to be printed each on separate line.
MiniMisc.put_text = function(...)
local objects = {}
-- Not using `{...}` because it removes `nil` input
for i = 1, select('#', ...) do
local v = select(i, ...)
table.insert(objects, vim.inspect(v))
end
local lines = vim.split(table.concat(objects, '\n'), '\n')
local lnum = vim.api.nvim_win_get_cursor(0)[1]
vim.fn.append(lnum, lines)
return ...
end
--- Resize window to have exact number of editable columns
---
---@param win_id number|nil Window identifier (see |win_getid()|) to be resized.
--- Default: 0 for current.
---@param text_width number|nil Number of editable columns resized window will
--- display. Default: first element of 'colorcolumn' or otherwise 'textwidth'
--- (using screen width as its default but not more than 79).
MiniMisc.resize_window = function(win_id, text_width)
win_id = win_id or 0
text_width = text_width or H.default_text_width(win_id)
vim.api.nvim_win_set_width(win_id, text_width + MiniMisc.get_gutter_width(win_id))
end
H.default_text_width = function(win_id)
local buf = vim.api.nvim_win_get_buf(win_id)
local textwidth = vim.bo[buf].textwidth
textwidth = (textwidth == 0) and math.min(vim.o.columns, 79) or textwidth
local colorcolumn = vim.wo[win_id].colorcolumn
if colorcolumn ~= '' then
local cc = vim.split(colorcolumn, ',')[1]
local is_cc_relative = vim.tbl_contains({ '-', '+' }, cc:sub(1, 1))
if is_cc_relative then
return textwidth + tonumber(cc)
else
return tonumber(cc)
end
else
return textwidth
end
end
--- Set up automated change of current directory
---
--- What it does:
--- - Creates autocommand which on every |BufEnter| event with |MiniMisc.find_root()|
--- finds root directory for current buffer file and sets |current-directory|
--- to it (using |chdir()|).
--- - Resets |autochdir| to `false`.
---
---@param names table|function|nil Forwarded to |MiniMisc.find_root()|.
---@param fallback function|nil Forwarded to |MiniMisc.find_root()|.
---
---@usage >lua
--- require('mini.misc').setup()
--- MiniMisc.setup_auto_root()
--- <
MiniMisc.setup_auto_root = function(names, fallback)
names = names or { '.git', 'Makefile' }
if not (H.is_array_of(names, H.is_string) or vim.is_callable(names)) then
H.error('Argument `names` of `setup_auto_root()` should be array of string file names or a callable.')
end
fallback = fallback or function() return nil end
if not vim.is_callable(fallback) then H.error('Argument `fallback` of `setup_auto_root()` should be callable.') end
-- Disable conflicting option
vim.o.autochdir = false
-- Create autocommand
local set_root = function(data)
local root = MiniMisc.find_root(data.buf, names, fallback)
if root == nil then return end
vim.fn.chdir(root)
end
local augroup = vim.api.nvim_create_augroup('MiniMiscAutoRoot', {})
vim.api.nvim_create_autocmd(
'BufEnter',
{ group = augroup, callback = set_root, desc = 'Find root and change current directory' }
)
end
--- Find root directory
---
--- Based on a buffer name (full path to file opened in a buffer) find a root
--- directory. If buffer is not associated with file, returns `nil`.
---
--- Root directory is a directory containing at least one of pre-defined files.
--- It is searched using |vim.fn.find()| with `upward = true` starting from
--- directory of current buffer file until first occurrence of root file(s).
---
--- Notes:
--- - Uses directory path caching to speed up computations. This means that no
--- changes in root directory will be detected after directory path was already
--- used in this function. Reload Neovim to account for that.
---
---@param buf_id number|nil Buffer identifier (see |bufnr()|) to use.
--- Default: 0 for current.
---@param names table|function|nil Array of file names or a callable used to
--- identify a root directory. Forwarded to |vim.fs.find()|.
--- Default: `{ '.git', 'Makefile' }`.
---@param fallback function|nil Callable fallback to use if no root is found
--- with |vim.fs.find()|. Will be called with a buffer path and should return
--- a valid directory path.
MiniMisc.find_root = function(buf_id, names, fallback)
buf_id = buf_id or 0
names = names or { '.git', 'Makefile' }
fallback = fallback or function() return nil end
if type(buf_id) ~= 'number' then H.error('Argument `buf_id` of `find_root()` should be number.') end
if not (H.is_array_of(names, H.is_string) or vim.is_callable(names)) then
H.error('Argument `names` of `find_root()` should be array of string file names or a callable.')
end
if not vim.is_callable(fallback) then H.error('Argument `fallback` of `find_root()` should be callable.') end
-- Compute directory to start search from. NOTEs on why not using file path:
-- - This has better performance because `vim.fs.find()` is called less.
-- - *Needs* to be a directory for callable `names` to work.
-- - Later search is done including initial `path` if directory, so this
-- should work for detecting buffer directory as root.
local path = vim.api.nvim_buf_get_name(buf_id)
if path == '' then return end
local dir_path = vim.fs.dirname(path)
-- Try using cache
local res = H.root_cache[dir_path]
if res ~= nil then return res end
-- Find root
local root_file = vim.fs.find(names, { path = dir_path, upward = true })[1]
if root_file ~= nil then
res = vim.fs.dirname(root_file)
else
res = fallback(path)
end
-- Use absolute path to an existing directory
if type(res) ~= 'string' then return end
res = H.fs_normalize(vim.fn.fnamemodify(res, ':p'))
if vim.fn.isdirectory(res) == 0 then return end
-- Cache result per directory path
H.root_cache[dir_path] = res
return res
end
H.root_cache = {}
--- Set up terminal background synchronization
---
--- What it does:
--- - Checks if terminal emulator supports OSC 11 control sequence. Stops if not.
--- - Creates |UIEnter| and |ColorScheme| autocommands which change terminal
--- background to have same color as |guibg| of |hl-Normal|.
--- - Creates |UILeave| autocommand which sets terminal background back to the
--- color at the time this function was called first time in current session.
--- - Synchronizes background immediately to allow not depend on loading order.
---
--- Primary use case is to remove possible "frame" around current Neovim instance
--- which appears if Neovim's |hl-Normal| background color differs from what is
---
--- Make sure to call it only during interactive session in terminal emulator.
MiniMisc.setup_termbg_sync = function()
local augroup = vim.api.nvim_create_augroup('MiniMiscTermbgSync', { clear = true })
local f = function(args)
local ok, bg_init = pcall(H.parse_osc11, args.data)
if not (ok and type(bg_init) == 'string') then
H.notify('`setup_termbg_sync()` could not parse terminal emulator response ' .. vim.inspect(args.data), 'WARN')
return
end
-- Set up sync
local sync = function()
local normal = vim.api.nvim_get_hl_by_name('Normal', true)
if normal.background == nil then return end
io.write(string.format('\027]11;#%06x\007', normal.background))
end
vim.api.nvim_create_autocmd({ 'UIEnter', 'ColorScheme' }, { group = augroup, callback = sync })
-- Set up reset to the color returned from the very first call
H.termbg_init = H.termbg_init or bg_init
local reset = function() io.write('\027]11;' .. H.termbg_init .. '\007') end
vim.api.nvim_create_autocmd({ 'UILeave' }, { group = augroup, callback = reset })
-- Sync immediately
sync()
end
-- Ask about current background color and process the response
local id = vim.api.nvim_create_autocmd('TermResponse', { group = augroup, callback = f, nested = true })
io.write('\027]11;?\007')
vim.defer_fn(function()
local ok = pcall(vim.api.nvim_del_autocmd, id)
if ok then H.notify('`setup_termbg_sync()` did not get response from terminal emulator', 'WARN') end
end, 1000)
end
-- Source: 'runtime/lua/vim/_defaults.lua' in Neovim source
H.parse_osc11 = function(x)
local r, g, b = x:match('^\027%]11;rgb:(%x+)/(%x+)/(%x+)$')
if not (r and g and b) then
local a
r, g, b, a = x:match('^\027%]11;rgba:(%x+)/(%x+)/(%x+)/(%x+)$')
if not (a and a:len() <= 4) then return end
end
if not (r and g and b) then return end
if not (r:len() <= 4 and g:len() <= 4 and b:len() <= 4) then return end
local parse_osc_hex = function(c) return c:len() == 1 and (c .. c) or c:sub(1, 2) end
return '#' .. parse_osc_hex(r) .. parse_osc_hex(g) .. parse_osc_hex(b)
end
--- Restore cursor position on file open
---
--- When reopening a file this will make sure the cursor is placed back to the
--- position where you left before. This implements |restore-cursor| in a nicer way.
--- File should have a recognized file type (see 'filetype') and be opened in
--- a normal buffer (see 'buftype').
---
--- Note: it relies on file mark data stored in 'shadafile' (see |shada-f|).
--- Be sure to enable it.
---
---@param opts table|nil Options for |MiniMisc.restore_cursor|. Possible fields:
--- - <center> - (boolean) Center the window after we restored the cursor.
--- Default: `true`.
--- - <ignore_filetype> - Array with file types to be ignored (see 'filetype').
--- Default: `{ "gitcommit", "gitrebase" }`.
---
---@usage >lua
--- require('mini.misc').setup_restore_cursor()
--- <
MiniMisc.setup_restore_cursor = function(opts)
opts = opts or {}
opts.ignore_filetype = opts.ignore_filetype or { 'gitcommit', 'gitrebase' }
if not H.is_array_of(opts.ignore_filetype, H.is_string) then
H.error('In `setup_restore_cursor()` `opts.ignore_filetype` should be an array of strings.')
end
if opts.center == nil then opts.center = true end
if type(opts.center) ~= 'boolean' then H.error('In `setup_restore_cursor()` `opts.center` should be a boolean.') end
-- Create autocommand which runs once on `FileType` for every new buffer
local augroup = vim.api.nvim_create_augroup('MiniMiscRestoreCursor', {})
vim.api.nvim_create_autocmd('BufReadPre', {
group = augroup,
callback = function(data)
vim.api.nvim_create_autocmd('FileType', {
buffer = data.buf,
>
callback = function() H.restore_cursor(opts) end,
})
end,
})
end
H.restore_cursor = function(opts)
-- Stop if not a normal buffer
if vim.bo.buftype ~= '' then return end
-- Stop if filetype is ignored
if vim.tbl_contains(opts.ignore_filetype, vim.bo.filetype) then return end
-- Stop if line is already specified (like during start with `nvim file +num`)
local cursor_line = vim.api.nvim_win_get_cursor(0)[1]
if cursor_line > 1 then return end
-- Stop if can't restore proper line for some reason
local mark_line = vim.api.nvim_buf_get_mark(0, [["]])[1]
local n_lines = vim.api.nvim_buf_line_count(0)
if not (1 <= mark_line and mark_line <= n_lines) then return end
-- Restore cursor and open just enough folds
vim.cmd([[normal! g`"zv]])
-- Center window
if opts.center then vim.cmd('normal! zz') end
end
--- Compute summary statistics of numerical array
---
--- This might be useful to compute summary of time benchmarking with
--- |MiniMisc.bench_time|.
---
---@param t table Array (table suitable for `ipairs`) of numbers.
---
---@return table Table with summary values under following keys (may be
--- extended in the future): <maximum>, <mean>, <median>, <minimum>, <n>
--- (number of elements), <sd> (sample standard deviation).
MiniMisc.stat_summary = function(t)
if not H.is_array_of(t, H.is_number) then
H.error('Input of `MiniMisc.stat_summary()` should be an array of numbers.')
end
-- Welford algorithm of computing variance
-- Source: https://www.johndcook.com/blog/skewness_kurtosis/
local n = #t
local delta, m1, m2 = 0, 0, 0
local minimum, maximum = math.huge, -math.huge
for i, x in ipairs(t) do
delta = x - m1
m1 = m1 + delta / i
m2 = m2 + delta * (x - m1)
-- Extremums
minimum = x < minimum and x or minimum
maximum = x > maximum and x or maximum
end
return {
maximum = maximum,
mean = m1,
median = H.compute_median(t),
minimum = minimum,
n = n,
sd = math.sqrt(n > 1 and m2 / (n - 1) or 0),
}
end
H.compute_median = function(t)
local n = #t
if n == 0 then return 0 end
local t_sorted = vim.deepcopy(t)
table.sort(t_sorted)
return 0.5 * (t_sorted[math.ceil(0.5 * n)] + t_sorted[math.ceil(0.5 * (n + 1))])
end
--- Return "first" elements of table as decided by `pairs`
---
--- Note: order of elements might vary.
---
---@param t table Input table.
---@param n number|nil Maximum number of first elements. Default: 5.
---
---@return table Table with at most `n` first elements of `t` (with same keys).
MiniMisc.tbl_head = function(t, n)
n = n or 5
local res, n_res = {}, 0
for k, val in pairs(t) do
if n_res >= n then return res end
res[k] = val
n_res = n_res + 1
end
return res
end
--- Return "last" elements of table as decided by `pairs`
---
--- This function makes two passes through elements of `t`:
--- - First to count number of elements.
--- - Second to construct result.
---
--- Note: order of elements might vary.
---
---@param t table Input table.
---@param n number|nil Maximum number of last elements. Default: 5.
---
---@return table Table with at most `n` last elements of `t` (with same keys).
MiniMisc.tbl_tail = function(t, n)
n = n or 5
-- Count number of elements on first pass
local n_all = 0
for _, _ in pairs(t) do
n_all = n_all + 1
end
-- Construct result on second pass
local res = {}
local i, start_i = 0, n_all - n + 1
for k, val in pairs(t) do
i = i + 1
if i >= start_i then res[k] = val end
end
return res
end
--- Add possibility of nested comment leader
---
--- This works by parsing 'commentstring' buffer option, extracting
--- non-whitespace comment leader (symbols on the left of commented line), and
--- locally modifying 'comments' option (by prepending `n:<leader>`). Does
--- nothing if 'commentstring' is empty or has comment symbols both in front
--- and back (like "/*%s*/").
---
--- Nested comment leader added with this function is useful for formatting
--- nested comments. For example, have in Lua "first-level" comments with '--'
--- and "second-level" comments with '----'. With nested comment leader second
--- type can be formatted with `gq` in the same way as first one.
---
--- Recommended usage is with |autocmd|: >lua
---
--- local use_nested_comments = function() MiniMisc.use_nested_comments() end
--- vim.api.nvim_create_autocmd('BufEnter', { callback = use_nested_comments })
--- <
--- Note: for most filetypes 'commentstring' option is added only when buffer
--- with this filetype is entered, so using non-current `buf_id` can not lead
--- to desired effect.
---
---@param buf_id number|nil Buffer identifier (see |bufnr()|) in which function
--- will operate. Default: 0 for current.
MiniMisc.use_nested_comments = function(buf_id)
buf_id = buf_id or 0
local commentstring = vim.bo[buf_id].commentstring
if commentstring == '' then return end
-- Extract raw comment leader from 'commentstring' option
local comment_parts = vim.tbl_filter(function(x) return x ~= '' end, vim.split(commentstring, '%s', true))
-- Don't do anything if 'commentstring' is like '/*%s*/' (as in 'json')
if #comment_parts > 1 then return end
-- Get comment leader by removing whitespace
local leader = vim.trim(comment_parts[1])
local comments = vim.bo[buf_id].comments
local new_comments = string.format('n:%s,%s', leader, comments)
vim.api.nvim_buf_set_option(buf_id, 'comments', new_comments)
end
--- Zoom in and out of a buffer, making it full screen in a floating window
---
--- This function is useful when working with multiple windows but temporarily
--- needing to zoom into one to see more of the code from that buffer. Call it
--- again (without arguments) to zoom out.
---
---@param buf_id number|nil Buffer identifier (see |bufnr()|) to be zoomed.
--- Default: 0 for current.
---@param config table|nil Optional config for window (as for |nvim_open_win()|).
MiniMisc.zoom = function(buf_id, config)
if H.zoom_winid and vim.api.nvim_win_is_valid(H.zoom_winid) then
vim.api.nvim_win_close(H.zoom_winid, true)
H.zoom_winid = nil
else
buf_id = buf_id or 0
-- Currently very big `width` and `height` get truncated to maximum allowed
local default_config = { relative = 'editor', row = 0, col = 0, width = 1000, height = 1000 }
config = vim.tbl_deep_extend('force', default_config, config or {})
H.zoom_winid = vim.api.nvim_open_win(buf_id, true, config)
vim.wo.winblend = 0
vim.cmd('normal! zz')
end
end
-- Helper data ================================================================
-- Module default config
H.default_config = vim.deepcopy(MiniMisc.config)
-- Window identifier of current zoom (for `zoom()`)
H.zoom_winid = nil
-- 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', vim.deepcopy(H.default_config), config or {})
vim.validate({
make_global = {
config.make_global,
function(x)
if type(x) ~= 'table' then return false end
local present_fields = vim.tbl_keys(MiniMisc)
for _, v in pairs(x) do
if not vim.tbl_contains(present_fields, v) then return false end
end
return true
end,
'`make_global` should be a table with `MiniMisc` actual fields',
},
})
return config
end
H.apply_config = function(config)
MiniMisc.config = config
for _, v in pairs(config.make_global) do
_G[v] = MiniMisc[v]
end
end
-- Utilities ------------------------------------------------------------------
H.error = function(msg) error('(mini.misc) ' .. msg) end
H.notify = function(msg, level) vim.notify('(mini.misc) ' .. msg, vim.log.levels[level]) end
H.is_array_of = function(x, predicate)
if not H.islist(x) then return false end
for _, v in ipairs(x) do
if not predicate(v) then return false end
end
return true
end
H.is_number = function(x) return type(x) == 'number' end
H.is_string = function(x) return type(x) == 'string' end
H.fs_normalize = vim.fs.normalize
if vim.fn.has('nvim-0.9') == 0 then
H.fs_normalize = function(...) return vim.fs.normalize(...):gsub('(.)/+$', '%1') end
end
-- TODO: Remove after compatibility with Neovim=0.9 is dropped
H.islist = vim.fn.has('nvim-0.10') == 1 and vim.islist or vim.tbl_islist
return MiniMisc