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1594 lines (1390 loc) · 57.6 KB
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--- *mini.starter* Start screen
--- *MiniStarter*
---
--- MIT License Copyright (c) 2021 Evgeni Chasnovski
---
--- ==============================================================================
---
--- 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|.
---
--- - 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 (see |MiniStarter.get_content()|) and identifier as input
--- while returning 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.
---
--- To stop module from showing non-error feedback, set `config.silent = true`.
---
--- # 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 `vim.g.ministarter_disable` (globally) or
--- `vim.b.ministarter_disable` (for a buffer) to `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.
--- Example configurations
---
--- Configuration similar to 'mhinz/vim-startify': >lua
---
--- 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': >lua
---
--- 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: >lua
---
--- 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 inactive) 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.bo.filetype ~= 'ministarter' 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 __starter_section_fun function Function which returns array of items.
-- Module definition ==========================================================
local MiniStarter = {}
local H = {}
--- Module setup
---
---@param config table|nil Module config table. See |MiniStarter.config|.
---
---@usage >lua
--- require('mini.starter').setup() -- use default config
--- -- OR
--- 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)
-- Define behavior
H.create_autocommands(config)
-- Create default highlighting
H.create_default_hl()
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_-.',
-- Whether to disable showing non-error feedback
silent = false,
}
--minidoc_afterlines_end
-- Module functionality =======================================================
--- 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, use |autocmd-nested|. Example: >lua
---
--- local starter_open = function() MiniStarter.open() end
--- local au_opts = { nested = true, callback = starter_open }
--- vim.api.nvim_create_autocmd('TabNewEntered', au_opts)
--- <
---@param buf_id number|nil 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. Delay at startup, as it is executed with `noautocmd`.
local trigger_event = function() vim.api.nvim_exec_autocmds('User', { pattern = 'MiniStarterOpened' }) end
if H.is_in_vimenter then trigger_event = vim.schedule_wrap(trigger_event) end
trigger_event()
-- 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. All hooks are applied with `(content, buf_id)` signature. Output
--- of one hook serves as first argument 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, buf_id)
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|nil Number of returned items. Default: 5.
---@param recent boolean|nil Whether to use recent sessions (instead of
--- alphabetically by name). Default: true.
---
---@return __starter_section_fun
MiniStarter.sections.sessions = function(n, recent)
n = n or 5
if recent == nil then recent = true end
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|nil Number of returned items. Default: 5.
---@param current_dir boolean|nil Whether to return files only from current working
--- directory and its subdirectories. Default: `false`.
---@param show_path boolean|function|nil Whether to append file name with its path.
--- If callable, will be called with full path and should return string to be
--- directly appended to file name. Default: `true`.
---
---@return __starter_section_fun
MiniStarter.sections.recent_files = function(n, current_dir, show_path)
n = n or 5
if current_dir == nil then current_dir = false end
if show_path == nil then show_path = true end
if show_path == false then show_path = function() return '' end end
if show_path == true then
show_path = function(path) return string.format(' (%s)', vim.fn.fnamemodify(path, ':~:.')) end
end
if not vim.is_callable(show_path) then H.error('`show_path` should be boolean or callable.') end
return function()
local section = string.format('Recent files%s', 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 sep = vim.loop.os_uname().sysname == 'Windows_NT' and [[%\]] or '%/'
local cwd_pattern = '^' .. vim.pesc(vim.fn.getcwd()) .. sep
-- Use only files from current directory and its subdirectories
files = vim.tbl_filter(function(f) return f:find(cwd_pattern) ~= nil 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 = {}
for _, f in ipairs(vim.list_slice(files, 1, n)) do
local name = vim.fn.fnamemodify(f, ':t') .. show_path(f)
table.insert(items, { action = 'edit ' .. f, name = name, section = section })
end
return items
end
end
-- stylua: ignore
--- Section with 'mini.pick' pickers
---
--- Notes:
--- - All actions require |mini.pick| module of 'mini.nvim'.
--- - "Command history", "Explorer", and "Visited paths" items
--- require |mini.extra| module of 'mini.nvim'.
--- - "Visited paths" items requires |mini.visits| module of 'mini.nvim'.
---
---@return __starter_section_fun
MiniStarter.sections.pick = function()
return function()
return {
{ action = 'Pick history scope=":"', name = 'Command history', section = 'Pick' },
{ action = 'Pick explorer', name = 'Explorer', section = 'Pick' },
{ action = 'Pick files', name = 'Files', section = 'Pick' },
{ action = 'Pick grep_live', name = 'Grep live', section = 'Pick' },
{ action = 'Pick help', name = 'Help tags', section = 'Pick' },
{ action = 'Pick visit_paths', name = 'Visited paths', section = 'Pick' },
}
end
end
-- stylua: ignore
--- Section with basic Telescope pickers relevant to start screen
---
--- Notes:
--- - All actions require 'nvim-telescope/telescope.nvim' plugin.
--- - "Browser" item requires 'nvim-telescope/telescope-file-browser.nvim'.
---
---@return __starter_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
-- 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|nil Number of empty spaces to add to start of each content
--- line. Default: 0.
---@param top number|nil 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|nil String to be placed to the left of item name.
--- Default: "░ ".
---@param place_cursor boolean|nil 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 '░ '
if place_cursor == nil then place_cursor = true end
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|nil One of "all" (number indexing across all sections) or
--- "section" (letter-number indexing within each section). Default: "all".
---@param exclude_sections table|nil 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. Window width and height are taken from first window in current
--- tabpage displaying the Starter buffer.
---
--- 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|nil One of "left", "center", "right". Default: "left".
---@param vertical string|nil One of "top", "center", "bottom". Default: "top".
---
---@return function Content hook.
MiniStarter.gen_hook.aligning = function(horizontal, vertical)
horizontal = horizontal or 'left'
vertical = vertical or 'top'
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, buf_id)
local win_id = vim.fn.bufwinid(buf_id)
if win_id < 0 then return end
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(win_id) - 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(win_id) - #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|nil 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(_) 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|nil 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 corresponding `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|nil 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|nil 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
-- Helper data ================================================================
-- Module default config
H.default_config = vim.deepcopy(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)