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1500 lines (1311 loc) · 53.8 KB
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-- MIT License Copyright (c) 2021 Evgeni Chasnovski
-- Documentation ==============================================================
--- Fast and flexible start screen. Displayed items are fully customizable both
--- in terms of what they do and how they look (with reasonable defaults). Item
--- selection can be done using prefix query with instant visual feedback.
---
--- Key design ideas:
--- - All available actions are defined inside items. Each item should have the
--- following info:
--- - <action> - function or string for |vim.cmd| which is executed when
--- item is chosen. Empty string result in placeholder "inactive" item.
--- - <name> - string which will be displayed and used for choosing.
--- - <section> - string representing to which section item belongs.
--- There are pre-configured whole sections in |MiniStarter.sections|.<
10000
/div>
--- - Configure what items are displayed by supplying an array which can be
--- normalized to an array of items. Read about how supplied items are
--- normalized in |MiniStarter.refresh|.
--- - Modify the final look by supplying content hooks: functions which take
--- buffer content as input (see |MiniStarter.get_content()| for more
--- information) and return buffer content as output. There are
--- pre-configured content hook generators in |MiniStarter.gen_hook|.
--- - Choosing an item can be done in two ways:
--- - Type prefix query to filter item by matching its name (ignoring
--- case). Displayed information is updated after every typed character.
--- For every item its unique prefix is highlighted.
--- - Use Up/Down arrows and hit Enter.
--- - Allow multiple simultaneously open Starter buffers.
---
--- What is doesn't do:
--- - It doesn't support fuzzy query for items. And probably will never do.
---
--- # Setup~
---
--- This module needs a setup with `require('mini.starter').setup({})`
--- (replace `{}` with your `config` table). It will create global Lua table
--- `MiniStarter` which you can use for scripting or manually (with
--- `:lua MiniStarter.*`).
---
--- See |MiniStarter.config| for `config` structure and default values. For
--- some configuration examples (including one similar to 'vim-startify' and
--- 'dashboard-nvim'), see |MiniStarter-example-config|.
---
--- You can override runtime config settings locally to buffer inside
--- `vim.b.ministarter_config` which should have same structure as
--- `MiniStarter.config`. See |mini.nvim-buffer-local-config| for more details.
--- Note: `vim.b.ministarter_config` is copied to Starter buffer from current
--- buffer allowing full customization.
---
--- # Highlight groups~
---
--- * `MiniStarterCurrent` - current item.
--- * `MiniStarterFooter` - footer units.
--- * `MiniStarterHeader` - header units.
--- * `MiniStarterInactive` - inactive item.
--- * `MiniStarterItem` - item name.
--- * `MiniStarterItemBullet` - units from |MiniStarter.gen_hook.adding_bullet|.
--- * `MiniStarterItemPrefix` - unique query for item.
--- * `MiniStarterSection` - section units.
--- * `MiniStarterQuery` - current query in active items.
---
--- To change any highlight group, modify it directly with |:highlight|.
---
--- # Disabling~
---
--- To disable core functionality, set `g:ministarter_disable` (globally) or
--- `b:ministarter_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.starter
---@tag MiniStarter
--- Example configurations
---
--- Configuration similar to 'mhinz/vim-startify':
--- >
--- local starter = require('mini.starter')
--- starter.setup({
--- evaluate_single = true,
--- items = {
--- starter.sections.builtin_actions(),
--- starter.sections.recent_files(10, false),
--- starter.sections.recent_files(10, true),
--- -- Use this if you set up 'mini.sessions'
--- starter.sections.sessions(5, true)
--- },
--- content_hooks = {
--- starter.gen_hook.adding_bullet(),
--- starter.gen_hook.indexing('all', { 'Builtin actions' }),
--- starter.gen_hook.padding(3, 2),
--- },
--- })
--- <
--- Configuration similar to 'glepnir/dashboard-nvim':
--- >
--- local starter = require('mini.starter')
--- starter.setup({
--- items = {
--- starter.sections.telescope(),
--- },
--- content_hooks = {
--- starter.gen_hook.adding_bullet(),
--- starter.gen_hook.aligning('center', 'center'),
--- },
--- })
--- <
--- Elaborated configuration showing capabilities of custom items,
--- header/footer, and content hooks:
--- >
--- local my_items = {
--- { name = 'Echo random number', action = 'lua print(math.random())', section = 'Section 1' },
--- function()
--- return {
--- { name = 'Item #1 from function', action = [[echo 'Item #1']], section = 'From function' },
--- { name = 'Placeholder (always incative) item', action = '', section = 'From function' },
--- function()
--- return {
--- name = 'Item #1 from double function',
--- action = [[echo 'Double function']],
--- section = 'From double function',
--- }
--- end,
--- }
--- end,
--- { name = [[Another item in 'Section 1']], action = 'lua print(math.random() + 10)', section = 'Section 1' },
--- }
---
--- local footer_n_seconds = (function()
--- local timer = vim.loop.new_timer()
--- local n_seconds = 0
--- timer:start(0, 1000, vim.schedule_wrap(function()
--- if vim.api.nvim_buf_get_option(0, 'filetype') ~= 'starter' then
--- timer:stop()
--- return
--- end
--- n_seconds = n_seconds + 1
--- MiniStarter.refresh()
--- end))
---
--- return function()
--- return 'Number of seconds since opening: ' .. n_seconds
--- end
--- end)()
---
--- local hook_top_pad_10 = function(content)
--- -- Pad from top
--- for _ = 1, 10 do
--- -- Insert at start a line with single content unit
--- table.insert(content, 1, { { type = 'empty', string = '' } })
--- end
--- return content
--- end
---
--- local starter = require('mini.starter')
--- starter.setup({
--- items = my_items,
--- footer = footer_n_seconds,
--- content_hooks = { hook_top_pad_10 },
--- })
--- <
---@tag MiniStarter-example-config
--- # Lifecycle of Starter buffer~
---
--- - Open with |MiniStarter.open()|. It includes creating buffer with
--- appropriate options, mappings, behavior; call to |MiniStarter.refresh()|;
--- issue `MiniStarterOpened` |User| event.
--- - Wait for user to choose an item. This is done using following logic:
--- - Typing any character from `MiniStarter.config.query_updaters` leads
--- to updating query. Read more in |MiniStarter.add_to_query|.
--- - <BS> deletes latest character from query.
--- - <Down>/<Up>, <C-n>/<C-p>, <M-j>/<M-k> move current item.
--- - <CR> executes action of current item.
--- - <C-c> closes Starter buffer.
--- - Evaluate current item when appropriate (after `<CR>` or when there is a
--- single item and `MiniStarter.config.evaluate_single` is `true`). This
--- executes item's `action`.
---@tag MiniStarter-lifecycle
---@alias __starter_buf_id number|nil Buffer identifier of a valid Starter buffer.
--- Default: current buffer.
---@alias __section_fun function Function which returns array of items.
-- Module definition ==========================================================
local MiniStarter = {}
local H = {}
--- Module setup
---
---@param config table Module config table. See |MiniStarter.config|.
---
---@usage `require('mini.starter').setup({})` (replace `{}` with your `config` table)
MiniStarter.setup = function(config)
-- Export module
_G.MiniStarter = MiniStarter
-- Setup config
config = H.setup_config(config)
-- Apply config
H.apply_config(config)
-- Module behavior
vim.api.nvim_exec(
[[augroup MiniStarter
au!
au VimEnter * ++nested ++once lua MiniStarter.on_vimenter()
augroup END]],
false
)
-- Create highlighting
vim.api.nvim_exec(
[[hi default link MiniStarterCurrent NONE
hi default link MiniStarterFooter Title
hi default link MiniStarterHeader Title
hi default link MiniStarterInactive Comment
hi default link MiniStarterItem Normal
hi default link MiniStarterItemBullet Delimiter
hi default link MiniStarterItemPrefix WarningMsg
hi default link MiniStarterSection Delimiter
hi default link MiniStarterQuery MoreMsg]],
false
)
end
--- Module config
---
--- Default values:
---@eval return MiniDoc.afterlines_to_code(MiniDoc.current.eval_section)
MiniStarter.config = {
-- Whether to open starter buffer on VimEnter. Not opened if Neovim was
-- started with intent to show something else.
autoopen = true,
-- Whether to evaluate action of single active item
evaluate_single = false,
-- Items to be displayed. Should be an array with the following elements:
-- - Item: table with <action>, <name>, and <section> keys.
-- - Function: should return one of these three categories.
-- - Array: elements of these three types (i.e. item, array, function).
-- If `nil` (default), default items will be used (see |mini.starter|).
items = nil,
-- Header to be displayed before items. Converted to single string via
-- `tostring` (use `\n` to display several lines). If function, it is
-- evaluated first. If `nil` (default), polite greeting will be used.
header = nil,
-- Footer to be displayed after items. Converted to single string via
-- `tostring` (use `\n` to display several lines). If function, it is
-- evaluated first. If `nil` (default), default usage help will be shown.
footer = nil,
-- Array of functions to be applied consecutively to initial content.
-- Each function should take and return content for 'Starter' buffer (see
-- |mini.starter| and |MiniStarter.get_content()| for more details).
content_hooks = nil,
-- Characters to update query. Each character will have special buffer
-- mapping overriding your global ones. Be careful to not add `:` as it
-- allows you to go into command mode.
query_updaters = 'abcdefghijklmnopqrstuvwxyz0123456789_-.',
}
--minidoc_afterlines_end
-- Module functionality =======================================================
--- Act on |VimEnter|.
MiniStarter.on_vimenter = function()
if MiniStarter.config.autoopen and not H.is_something_shown() then
-- Set indicator used to make different decision on startup
H.is_in_vimenter = true
MiniStarter.open()
end
end
--- Open Starter buffer
---
--- - Create buffer if necessary and move into it.
--- - Set buffer options. Note that settings are done with |noautocmd| to
--- achieve a massive speedup.
--- - Set buffer mappings. Besides basic mappings (described inside "Lifecycle
--- of Starter buffer" of |mini.starter|), map every character from
--- `MiniStarter.config.query_updaters` to add itself to query with
--- |MiniStarter.add_to_query|.
--- - Populate buffer with |MiniStarter.refresh|.
--- - Issue custom `MiniStarterOpened` event to allow acting upon opening
--- Starter buffer. Use it with
--- `autocmd User MiniStarterOpened <your command>`.
---
--- Note: to fully use it in autocommand, it is recommended to utilize
--- |autocmd-nested|. Example:
--- `autocmd TabNewEntered * ++nested lua MiniStarter.open()`
---
---@param buf_id number Identifier of existing valid buffer (see |bufnr()|) to
--- open inside. Default: create a new one.
MiniStarter.open = function(buf_id)
if H.is_disabled() then return end
-- Ensure proper buffer and open it
if H.is_in_vimenter then
-- Use current buffer as it should be empty and not needed. This also
-- solves the issue of redundant buffer when opening a file from Starter.
buf_id = vim.api.nvim_get_current_buf()
end
if buf_id == nil or not vim.api.nvim_buf_is_valid(buf_id) then buf_id = vim.api.nvim_create_buf(false, true) end
-- Create buffer data entry
H.buffer_data[buf_id] = { current_item_id = 1, query = '' }
-- Ensure that local config in opened Starter buffer is the same as current.
-- This allow more advanced usage of buffer local configuration.
local config_local = vim.b.ministarter_config
vim.api.nvim_set_current_buf(buf_id)
vim.b.ministarter_config = config_local
-- Setup buffer behavior
H.make_buffer_autocmd(buf_id)
H.apply_buffer_options(buf_id)
H.apply_buffer_mappings(buf_id)
-- Populate buffer
MiniStarter.refresh()
-- Issue custom event
vim.cmd('doautocmd User MiniStarterOpened')
-- Ensure not being in VimEnter
H.is_in_vimenter = false
end
--- Refresh Starter buffer
---
--- - Normalize `MiniStarter.config.items`:
--- - Flatten: recursively (in depth-first fashion) parse its elements. If
--- function is found, execute it and continue with parsing its output
--- (this allows deferring item collection up until it is actually
--- needed). If proper item is found (table with fields `action`,
--- `name`, `section`), add it to output.
--- - Sort: order first by section and then by item id (both in order of
--- appearance).
--- - Normalize `MiniStarter.config.header` and `MiniStarter.config.footer` to
--- be multiple lines by splitting at `\n`. If function - evaluate it first.
--- - Make initial buffer content (see |MiniStarter.get_content()| for a
--- description of what a buffer content is). It consist from content lines
--- with single content unit:
--- - First lines contain strings of normalized header.
--- - Body is for normalized items. Section names have own lines preceded
--- by empty line.
--- - Last lines contain separate strings of normalized footer.
--- - Sequentially apply hooks from `MiniStarter.config.content_hooks` to
--- content. Output of one hook serves as input to the next.
--- - Gather final items from content with |MiniStarter.content_to_items|.
--- - Convert content to buffer lines with |MiniStarter.content_to_lines| and
--- add them to buffer.
--- - Add highlighting of content units.
--- - Position cursor.
--- - Make current query. This results into some items being marked as
--- "inactive" and updating highlighting of current query on "active" items.
---
--- Note: this function is executed on every |VimResized| to allow more
--- responsive behavior.
---
---@param buf_id __starter_buf_id
MiniStarter.refresh = function(buf_id)
buf_id = buf_id or vim.api.nvim_get_current_buf()
if not H.validate_starter_buf_id(buf_id, 'refresh()') then return end
local data = H.buffer_data[buf_id]
local config = H.get_config()
-- Normalize certain config values
data.header = H.normalize_header_footer(config.header or H.default_header)
local items = H.normalize_items(config.items or H.default_items)
data.footer = H.normalize_header_footer(config.footer or H.default_footer)
-- Evaluate content
local content = H.make_initial_content(data.header, items, data.footer)
local hooks = config.content_hooks or H.default_content_hooks
for _, f in ipairs(hooks) do
content = f(content)
end
data.content = content
-- Set items. Possibly reset current item id if items have changed.
local old_items = data.items
data.items = MiniStarter.content_to_items(content)
if not vim.deep_equal(data.items, old_items) then data.current_item_id = 1 end
-- Add content
vim.api.nvim_buf_set_option(buf_id, 'modifiable', true)
vim.api.nvim_buf_set_lines(buf_id, 0, -1, false, MiniStarter.content_to_lines(content))
vim.api.nvim_buf_set_option(buf_id, 'modifiable', false)
-- Add highlighting
H.content_highlight(buf_id)
H.items_highlight(buf_id)
-- -- Always position cursor on current item
H.position_cursor_on_current_item(buf_id)
H.add_hl_current_item(buf_id)
-- Apply current query (clear command line afterwards)
H.make_query(buf_id)
end
--- Close Starter buffer
---
---@param buf_id __starter_buf_id
MiniStarter.close = function(buf_id)
buf_id = buf_id or vim.api.nvim_get_current_buf()
if not H.validate_starter_buf_id(buf_id, 'close()') then return end
-- Use `pcall` to allow calling for already non-existing buffer
pcall(vim.api.nvim_buf_delete, buf_id, {})
end
-- Sections -------------------------------------------------------------------
--- Table of pre-configured sections
MiniStarter.sections = {}
--- Section with builtin actions
---
---@return table Array of items.
MiniStarter.sections.builtin_actions = function()
return {
{ name = 'Edit new buffer', action = 'enew', section = 'Builtin actions' },
{ name = 'Quit Neovim', action = 'qall', section = 'Builtin actions' },
}
end
--- Section with |MiniSessions| sessions
---
--- Sessions are taken from |MiniSessions.detected|. Notes:
--- - If it shows "'mini.sessions' is not set up", it means that you didn't
--- call `require('mini.sessions').setup()`.
--- - If it shows "There are no detected sessions in 'mini.sessions'", it means
--- that there are no sessions at the current sessions directory. Either
--- create session or supply different directory where session files are
--- stored (see |MiniSessions.setup|).
--- - Local session (if detected) is always displayed first.
---
---@param n number Number of returned items. Default: 5.
---@param recent boolean Whether to use recent sessions (instead of
--- alphabetically by name). Default: true.
---
---@return __section_fun
MiniStarter.sections.sessions = function(n, recent)
n = n or 5
recent = recent == nil and true or recent
return function()
if _G.MiniSessions == nil then
return { { name = [['mini.sessions' is not set up]], action = '', section = 'Sessions' } }
end
local items = {}
for session_name, session in pairs(_G.MiniSessions.detected) do
table.insert(items, {
_session = session,
name = ('%s%s'):format(session_name, session.type == 'local' and ' (local)' or ''),
action = ([[lua _G.MiniSessions.read('%s')]]):format(session_name),
section = 'Sessions',
})
end
if vim.tbl_count(items) == 0 then
return { { name = [[There are no detected sessions in 'mini.sessions']], action = '', section = 'Sessions' } }
end
local sort_fun
if recent then
sort_fun = function(a, b)
local a_time = a._session.type == 'local' and math.huge or a._session.modify_time
local b_time = b._session.type == 'local' and math.huge or b._session.modify_time
return a_time > b_time
end
else
sort_fun = function(a, b)
local a_name = a._session.type == 'local' and '' or a.name
local b_name = b._session.type == 'local' and '' or b.name
return a_name < b_name
end
end
table.sort(items, sort_fun)
-- Take only first `n` elements and remove helper fields
return vim.tbl_map(function(x)
x._session = nil
return x
end, vim.list_slice(items, 1, n))
end
end
--- Section with most recently used files
---
--- Files are taken from |vim.v.oldfiles|.
---
---@param n number Number of returned items. Default: 5.
---@param current_dir boolean Whether to return files only from current working
--- directory. Default: `false`.
---@param show_path boolean Whether to append file name with its full path.
--- Default: `true`.
---
---@return __section_fun
MiniStarter.sections.recent_files = function(n, current_dir, show_path)
n = n or 5
current_dir = current_dir == nil and false or current_dir
show_path = show_path == nil and true or show_path
if current_dir then vim.cmd('au DirChanged * lua MiniStarter.refresh()') end
return function()
local section = ('Recent files%s'):format(current_dir and ' (current directory)' or '')
-- Use only actual readable files
local files = vim.tbl_filter(function(f) return vim.fn.filereadable(f) == 1 end, vim.v.oldfiles or {})
if #files == 0 then
return { { name = 'There are no recent files (`v:oldfiles` is empty)', action = '', section = section } }
end
-- Possibly filter files from current directory
if current_dir then
local cwd = vim.loop.cwd()
local n_cwd = cwd:len()
files = vim.tbl_filter(function(f) return f:sub(1, n_cwd) == cwd end, files)
end
if #files == 0 then
return { { name = 'There are no recent files in current directory', action = '', section = section } }
end
-- Create items
local items = {}
local fmodify = vim.fn.fnamemodify
for _, f in ipairs(vim.list_slice(files, 1, n)) do
local path = show_path and (' (%s)'):format(fmodify(f, ':~:.')) or ''
local name = ('%s%s'):format(fmodify(f, ':t'), path)
table.insert(items, { action = ('edit %s'):format(fmodify(f, ':p')), name = name, section = section })
end
return items
end
end
-- stylua: ignore start
--- Section with basic Telescope pickers relevant to start screen
---
---@return __section_fun
MiniStarter.sections.telescope = function()
return function()
return {
{action = 'Telescope file_browser', name = 'Browser', section = 'Telescope'},
{action = 'Telescope command_history', name = 'Command history', section = 'Telescope'},
{action = 'Telescope find_files', name = 'Files', section = 'Telescope'},
{action = 'Telescope help_tags', name = 'Help tags', section = 'Telescope'},
{action = 'Telescope live_grep', name = 'Live grep', section = 'Telescope'},
{action = 'Telescope oldfiles', name = 'Old files', section = 'Telescope'},
}
end
end
-- stylua: ignore end
-- Content hooks --------------------------------------------------------------
--- Table with pre-configured content hook generators
---
--- Each element is a function which returns content hook. So to use them
--- inside |MiniStarter.setup|, call them.
MiniStarter.gen_hook = {}
--- Hook generator for padding
---
--- Output is a content hook which adds constant padding from left and top.
--- This allows tweaking the screen position of buffer content.
---
---@param left number Number of empty spaces to add to start of each content
--- line. Default: 0.
---@param top number Number of empty lines to add to start of content.
--- Default: 0.
---
---@return function Content hook.
MiniStarter.gen_hook.padding = function(left, top)
left = math.max(left or 0, 0)
top = math.max(top or 0, 0)
return function(content)
-- Add left padding
local left_pad = string.rep(' ', left)
for _, line in ipairs(content) do
local is_empty_line = #line == 0 or (#line == 1 and line[1].string == '')
if not is_empty_line then table.insert(line, 1, H.content_unit(left_pad, 'empty', nil)) end
end
-- Add top padding
local top_lines = {}
for _ = 1, top do
table.insert(top_lines, { H.content_unit('', 'empty', nil) })
end
content = vim.list_extend(top_lines, content)
return content
end
end
--- Hook generator for adding bullet to items
---
--- Output is a content hook which adds supplied string to be displayed to the
--- left of item.
---
---@param bullet string String to be placed to the left of item name.
--- Default: "░ ".
---@param place_cursor boolean Whether to place cursor on the first character
--- of bullet when corresponding item becomes current. Default: true.
---
---@return function Content hook.
MiniStarter.gen_hook.adding_bullet = function(bullet, place_cursor)
bullet = bullet or '░ '
place_cursor = place_cursor == nil and true or place_cursor
return function(content)
local coords = MiniStarter.content_coords(content, 'item')
-- Go backwards to avoid conflict when inserting units
for i = #coords, 1, -1 do
local l_num, u_num = coords[i].line, coords[i].unit
local bullet_unit = {
string = bullet,
type = 'item_bullet',
hl = 'MiniStarterItemBullet',
-- Use `_item` instead of `item` because it is better to be 'private'
_item = content[l_num][u_num].item,
_place_cursor = place_cursor,
}
table.insert(content[l_num], u_num, bullet_unit)
end
return content
end
end
--- Hook generator for indexing items
---
--- Output is a content hook which adds unique index to the start of item's
--- name. It results into shortening queries required to choose an item (at
--- expense of clarity).
---
---@param grouping string One of "all" (number indexing across all sections) or
--- "section" (letter-number indexing within each section). Default: "all".
---@param exclude_sections table Array of section names (values of `section`
--- element of item) for which index won't be added. Default: `{}`.
---
---@return function Content hook.
MiniStarter.gen_hook.indexing = function(grouping, exclude_sections)
grouping = grouping or 'all'
exclude_sections = exclude_sections or {}
local per_section = grouping == 'section'
return function(content)
local cur_section, n_section, n_item = nil, 0, 0
local coords = MiniStarter.content_coords(content, 'item')
for _, c in ipairs(coords) do
local unit = content[c.line][c.unit]
local item = unit.item
if not vim.tbl_contains(exclude_sections, item.section) then
n_item = n_item + 1
if cur_section ~= item.section then
cur_section = item.section
-- Cycle through lower case letters
n_section = math.fmod(n_section, 26) + 1
n_item = per_section and 1 or n_item
end
local section_index = per_section and string.char(96 + n_section) or ''
unit.string = ('%s%s. %s'):format(section_index, n_item, unit.string)
end
end
return content
end
end
--- Hook generator for aligning content
---
--- Output is a content hook which independently aligns content horizontally
--- and vertically. Basically, this computes left and top pads for
--- |MiniStarter.gen_hook.padding| such that output lines would appear aligned
--- in certain way.
---
---@param horizontal string One of "left", "center", "right". Default: "left".
---@param vertical string One of "top", "center", "bottom". Default: "top".
---
---@return function Content hook.
MiniStarter.gen_hook.aligning = function(horizontal, vertical)
horizontal = horizontal == nil and 'left' or horizontal
vertical = vertical == nil and 'top' or vertical
local horiz_coef = ({ left = 0, center = 0.5, right = 1.0 })[horizontal]
local vert_coef = ({ top = 0, center = 0.5, bottom = 1.0 })[vertical]
return function(content)
local line_strings = MiniStarter.content_to_lines(content)
-- Align horizontally
-- Don't use `string.len()` to account for multibyte characters
local lines_width = vim.tbl_map(function(l) return vim.fn.strdisplaywidth(l) end, line_strings)
local min_right_space = vim.api.nvim_win_get_width(0) - math.max(unpack(lines_width))
local left_pad = math.max(math.floor(horiz_coef * min_right_space), 0)
-- Align vertically
local bottom_space = vim.api.nvim_win_get_height(0) - #line_strings
local top_pad = math.max(math.floor(vert_coef * bottom_space), 0)
return MiniStarter.gen_hook.padding(left_pad, top_pad)(content)
end
end
-- Work with content ----------------------------------------------------------
--- Get content of Starter buffer
---
--- Generally, buffer content is a table in the form of "2d array" (or rather
--- "2d list" because number of elements can differ):
--- - Each element represents content line: an array with content units to be
--- displayed in one buffer line.
--- - Each content unit is a table with at least the following elements:
--- - "type" - string with type of content. Something like "item",
--- "section", "header", "footer", "empty", etc.
--- - "string" - which string should be displayed. May be an empty string.
--- - "hl" - which highlighting should be applied to content string. May be
--- `nil` for no highlighting.
---
--- See |MiniStarter.content_to_lines| for converting content to buffer lines
--- and |MiniStarter.content_to_items| - to list of parsed items.
---
--- Notes:
--- - Content units with type "item" also have `item` element with all
--- information about an item it represents. Those elements are used directly
--- to create an array of items used for query.
---
---@param buf_id __starter_buf_id
MiniStarter.get_content = function(buf_id)
buf_id = buf_id or vim.api.nvim_get_current_buf()
if not H.validate_starter_buf_id(buf_id, 'get_content()', 'error') then return end
return H.buffer_data[buf_id].content
end
--- Helper to iterate through content
---
--- Basically, this traverses content "2d array" (in depth-first fashion; top
--- to bottom, left to right) and returns "coordinates" of units for which
--- `predicate` is true-ish.
---
---@param content table Content "2d array". Default: content of current buffer.
---@param predicate function|string|nil Predictate to filter units. If it is:
--- - Function, then it is evaluated with unit as input.
--- - String, then it checks unit to have this type (allows easy getting of
--- units with some type).
--- - `nil`, all units are kept.
---
---@return table Array of resulting units' coordinates. Each coordinate is a
--- table with <line> and <unit> keys. To retrieve actual unit from coordinate
--- `c`, use `content[c.line][c.unit]`.
MiniStarter.content_coords = function(content, predicate)
content = content or MiniStarter.get_content()
if predicate == nil then predicate = function(unit) return true end end
if type(predicate) == 'string' then
local pred_type = predicate
predicate = function(unit) return unit.type == pred_type end
end
local res = {}
for l_num, line in ipairs(content) do
for u_num, unit in ipairs(line) do
if predicate(unit) then table.insert(res, { line = l_num, unit = u_num }) end
end
end
return res
end
-- stylua: ignore start
--- Convert content to buffer lines
---
--- One buffer line is made by concatenating `string` element of units within
--- same content line.
---
---@param content table Content "2d array". Default: content of current buffer.
---
---@return table Array of strings for each buffer line.
MiniStarter.content_to_lines = function(content)
return vim.tbl_map(
function(content_line)
return table.concat(
-- Ensure that each content line is indeed a single buffer line
vim.tbl_map(function(x) return x.string:gsub('\n', ' ') end, content_line), ''
)
end,
content or MiniStarter.get_content()
)
end
-- stylua: ignore end
--- Convert content to items
---
--- Parse content (in depth-first fashion) and retrieve each item from `item`
--- element of content units with type "item". This also:
--- - Computes some helper information about how item will be actually
--- displayed (after |MiniStarter.content_to_lines|) and minimum number of
--- prefix characters needed for a particular item to be queried single.
--- - Modifies item's `name` element taking it from corresponing `string`
--- element of content unit. This allows modifying item's `name` at the stage
--- of content hooks (like, for example, in |MiniStarter.gen_hook.indexing|).
---
---@param content table Content "2d array". Default: content of current buffer.
---
---@return table Array of items.
MiniStarter.content_to_items = function(content)
content = content or MiniStarter.get_content()
-- NOTE: this havily utilizes 'modify by reference' nature of Lua tables
local items = {}
for l_num, line in ipairs(content) do
-- Track 0-based starting column of current unit (using byte length)
local start_col = 0
for _, unit in ipairs(line) do
-- Cursor position is (1, 0)-based
local cursorpos = { l_num, start_col }
if unit.type == 'item' then
local item = unit.item
-- Take item's name from content string
item.name = unit.string:gsub('\n', ' ')
item._line = l_num - 1
item._start_col = start_col
item._end_col = start_col + unit.string:len()
-- Don't overwrite possible cursor position from item's bullet
item._cursorpos = item._cursorpos or cursorpos
table.insert(items, item)
end
-- Prefer placing cursor at start of item's bullet
if unit.type == 'item_bullet' and unit._place_cursor then
-- Item bullet uses 'private' `_item` element instead of `item`
unit._item._cursorpos = cursorpos
end
start_col = start_col + unit.string:len()
end
end
-- Compute length of unique prefix for every item's name (ignoring case)
local strings = vim.tbl_map(function(x) return x.name:lower() end, items)
local nprefix = H.unique_nprefix(strings)
for i, n in ipairs(nprefix) do
items[i]._nprefix = n
end
return items
end
-- Other exported functions ---------------------------------------------------
--- Evaluate current item
---
--- Note that it resets current query before evaluation, as it is rarely needed
--- any more.
---
---@param buf_id __starter_buf_id
MiniStarter.eval_current_item = function(buf_id)
buf_id = buf_id or vim.api.nvim_get_current_buf()
if not H.validate_starter_buf_id(buf_id, 'eval_current_item()') then return end
-- Reset query before evaluation without query echo (avoids hit-enter-prompt)
H.make_query(vim.api.nvim_get_current_buf(), '', false)
local data = H.buffer_data[buf_id]
H.eval_fun_or_string(data.items[data.current_item_id].action, true)
end
--- Update current item
---
--- This makes next (with respect to `direction`) active item to be current.
---
---@param direction string One of "next" or "previous".
---@param buf_id __starter_buf_id
MiniStarter.update_current_item = function(direction, buf_id)
buf_id = buf_id or vim.api.nvim_get_current_buf()
if not H.validate_starter_buf_id(buf_id, 'update_current_item()') then return end
local data = H.buffer_data[buf_id]
-- Advance current item
local prev_current = data.current_item_id
data.current_item_id = H.next_active_item_id(buf_id, data.current_item_id, direction)
if data.current_item_id == prev_current then return end
-- Update cursor position
H.position_cursor_on_current_item(buf_id)
-- Highlight current item
vim.api.nvim_buf_clear_namespace(buf_id, H.ns.current_item, 0, -1)
H.add_hl_current_item(buf_id)
end
--- Add character to current query
---
--- - Update current query by appending `char` to its end (only if it results
--- into at least one active item) or delete latest character if `char` is `nil`.
--- - Recompute status of items: "active" if its name starts with new query,
--- "inactive" otherwise.
--- - Update highlighting: whole strings for "inactive" items, current query
--- for "active" items.
---
---@param char string Single character to be added to query. If `nil`, deletes
--- latest character from query.
---@param buf_id __starter_buf_id
MiniStarter.add_to_query = function(char, buf_id)
buf_id = buf_id or vim.api.nvim_get_current_buf()
if not H.validate_starter_buf_id(buf_id, 'add_to_query()') then return end
local data = H.buffer_data[buf_id]
local new_query
if char == nil then
new_query = data.query:sub(0, data.query:len() - 1)
else
new_query = ('%s%s'):format(data.query, char)
end
H.make_query(buf_id, new_query)
end
--- Set current query
---
---@param query string|nil Query to be set (only if it results into at least one
--- active item). Default: `nil` for setting query to empty string, which
--- essentially resets query.
---@param buf_id __starter_buf_id
MiniStarter.set_query = function(query, buf_id)
query = query or ''
if type(query) ~= 'string' then error('`query` should be either `nil` or string.') end
buf_id = buf_id or vim.api.nvim_get_current_buf()
if not H.validate_starter_buf_id(buf_id, 'add_to_query()') then return end
H.make_query(buf_id, query)
end
--- Act on |CursorMoved| by repositioning cursor in fixed place.
MiniStarter.on_cursormoved = function(buf_id)
buf_id = buf_id or vim.api.nvim_get_current_buf()
if not H.validate_starter_buf_id(buf_id, 'on_cursormoved()') then return end
H.position_cursor_on_current_item(buf_id)
end
-- Helper data ================================================================
-- Module default config
H.default_config = MiniStarter.config
-- Default config values
H.default_items = {
function()
if _G.MiniSessions == nil then return {} end
return MiniStarter.sections.sessions(5, true)()
end,
MiniStarter.sections.recent_files(5, false, false),
MiniStarter.sections.builtin_actions(),
}
H.default_header = function()
local hour = tonumber(vim.fn.strftime('%H'))
-- [04:00, 12:00) - morning, [12:00, 20:00) - day, [20:00, 04:00) - evening
local part_id = math.floor((hour + 4) / 8) + 1
local day_part = ({ 'evening', 'morning', 'afternoon', 'evening' })[part_id]
local username = vim.loop.os_get_passwd()['username'] or 'USERNAME'
return ('Good %s, %s'):format(day_part, username)
end
H.default_footer = [[
Type query to filter items
<BS> deletes latest character from query
<Esc> resets current query
<Down/Up>, <C-n/p>, <M-j/k> move current item
<CR> executes action of current item
<C-c> closes this buffer]]
H.default_content_hooks = { MiniStarter.gen_hook.adding_bullet(), MiniStarter.gen_hook.aligning('center', 'center') }
-- Storage for all Starter buffers. Fields - buffer number. Values - table:
-- - <content> - buffer content (2d array of units)
-- - <current_item_id> - identifier of current item
-- - <footer> - table of strings
-- - <header> - table of strings
-- - <items> - normalized items gathered from final content
-- - <query> - current search query
H.buffer_data = {}
-- Counter for unique buffer names