mini-misc.txt

*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_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.

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

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

Usage~
`require('mini.misc').setup({})` (replace `{}` with your `config` table)

------------------------------------------------------------------------------
                                                               *MiniMisc.config*
                               `MiniMisc.config`
Module config

Default values:
>
  MiniMisc.config = {
    -- Array of fields to make global (to be used as independent variables)
    make_global = { 'put', 'put_text' },
  }
<

------------------------------------------------------------------------------
                                                         *MiniMisc.bench_time()*
                     `MiniMisc.bench_time`({f}, {n}, {...})
Execute `f` several times and time how long it took

Parameters~
{f} `(function)` Function which execution to benchmark.
{n} `(number|nil)` Number of times to execute `f(...)`. Default: 1.
{...} `(any)` Arguments when calling `f`.

Return~
`(...)` Table with durations (in seconds; up to microseconds) and
  output of (last) function execution.

------------------------------------------------------------------------------
                                                   *MiniMisc.get_gutter_width()*
                     `MiniMisc.get_gutter_width`({win_id})
Compute width of gutter (info column on the left of the window)

Parameters~
{win_id} `(number|nil)` Window identifier (see |win_getid()|) for which gutter
  width is computed. Default: 0 for current.

------------------------------------------------------------------------------
                                                                *MiniMisc.put()*
                             `MiniMisc.put`({...})
Print Lua objects in command line

Parameters~
{...} `(any)` Any number of objects to be printed each on separate line.

------------------------------------------------------------------------------
                                                           *MiniMisc.put_text()*
                           `MiniMisc.put_text`({...})
Print Lua objects in current buffer

Parameters~
{...} `(any)` Any number of objects to be printed each on separate line.

------------------------------------------------------------------------------
                                                      *MiniMisc.resize_window()*
                `MiniMisc.resize_window`({win_id}, {text_width})
Resize window to have exact number of editable columns

Parameters~
{win_id} `(number|nil)` Window identifier (see |win_getid()|) to be resized.
  Default: 0 for current.
{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.setup_auto_root()*
                      `MiniMisc.setup_auto_root`({names})
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`.

Note: requires |vim.fs| module (present in Neovim>=0.8).

Parameters~
{names} `(table|function|nil)` Array of file names or a callable used to
  identify a root directory. Forwarded to |MiniMisc.find_root()|.
  Default: `{ '.git', 'Makefile' }`.

Usage~
>
  require('mini.misc').setup()
  MiniMisc.setup_auto_root()

------------------------------------------------------------------------------
                                                          *MiniMisc.find_root()*
                    `MiniMisc.find_root`({buf_id}, {names})
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 occurence of root file(s).

Notes:
- Requires |vim.fs| module (present in Neovim>=0.8).
- 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.

Parameters~
{buf_id} `(number|nil)` Buffer identifier (see |bufnr()|) to use.
  Default: 0 for current.
{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' }`.

------------------------------------------------------------------------------
                                               *MiniMisc.setup_restore_cursor()*
                    `MiniMisc.setup_restore_cursor`({opts})
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.

Parameters~
{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~
>
  require('mini.misc').setup_restore_cursor()

------------------------------------------------------------------------------
                                                       *MiniMisc.stat_summary()*
                          `MiniMisc.stat_summary`({t})
Compute summary statistics of numerical array

This might be useful to compute summary of time benchmarking with
|MiniMisc.bench_time|.

Parameters~
{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.tbl_head()*
                         `MiniMisc.tbl_head`({t}, {n})
Return "first" elements of table as decided by `pairs`

Note: order of elements might vary.

Parameters~
{t} `(table)` Input table.
{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_tail()*
                         `MiniMisc.tbl_tail`({t}, {n})
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.

Parameters~
{t} `(table)` Input table.
{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.use_nested_comments()*
                    `MiniMisc.use_nested_comments`({buf_id})
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.

Parameters~
{buf_id} `(number|nil)` Buffer identifier (see |bufnr()|) in which function
  will operate. Default: 0 for current.

------------------------------------------------------------------------------
                                                               *MiniMisc.zoom()*
                      `MiniMisc.zoom`({buf_id}, {config})
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.

Parameters~
{buf_id} `(number|nil)` Buffer identifier (see |bufnr()|) to be zoomed.
  Default: 0 for current.
{config} `(table|nil)` Optional config for window (as for |nvim_open_win()|).


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