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-- MIT License Copyright (c) 2021 Evgeni Chasnovski
-- Documentation ==============================================================
--- Lua module with miscellaneous useful functions (can be used independently).
---
--- # 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.
---@tag mini.misc
---@tag MiniMisc
---@toc_entry Miscellaneous functions
-- Module definition ==========================================================
local MiniMisc = {}
local H = {}
--- Module setup
---
---@param config table Module config table. See |MiniMisc.config|.
---
---@usage `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 Number of times to execute `f(...)`. Default: 1.
---@param ... any Arguments when calling `f`.
---
---@return ... Table with durations (in seconds; up to microseconds) 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_sec, start_usec = vim.loop.gettimeofday()
output = f(...)
local end_sec, end_usec = vim.loop.gettimeofday()
table.insert(durations, (end_sec - start_sec) + 0.000001 * (end_usec - start_usec))
end
return durations, output
end
--- Compute width of gutter (info column on the left of the window)
---
---@param win_id number 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 or 0
-- Store window metadata
local virtualedit = vim.opt.virtualedit
local curpos = vim.api.nvim_win_get_cursor(win_id)
-- Move cursor to the last visible column
local last_col = vim.api.nvim_win_call(win_id, function()
vim.opt.virtualedit = 'all'
vim.cmd('normal! g$')
return vim.fn.virtcol('.')
end)
-- Restore current window metadata
vim.opt.virtualedit = virtualedit
vim.api.nvim_win_set_cursor(win_id, curpos)
-- Compute result
return vim.api.nvim_win_get_width(win_id) - last_col
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 Window identifier (see |win_getid()|) to be resized.
--- Default: 0 for current.
---@param text_width number 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.api.nvim_buf_get_option(buf, 'textwidth')
textwidth = (textwidth == 0) and math.min(vim.o.columns, 79) or textwidth
local colorcolumn = vim.api.nvim_win_get_option(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
--- 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 type(t) ~= 'table' then
H.message('Input of `MiniMisc.stat_summary` should be an array of numbers.')
return
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 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 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|:
--- `autocmd BufEnter * lua pcall(require('mini.misc').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 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.api.nvim_buf_get_option(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.api.nvim_buf_get_option(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 Buffer identifier (see |bufnr()|) to be zoomed.
--- Default: 0 for current.
---@param config table 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.cmd('normal! zz')
end
end
-- Helper data ================================================================
-- Module default config
H.default_config = 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', 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.message = function(msg) vim.cmd('echomsg ' .. vim.inspect('(mini.misc) ' .. msg)) end
return MiniMisc