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-- Documentation ==============================================================

--- Minimal and fast tabline showing listed buffers. General idea: show all

--- listed buffers in readable way with minimal total width. Also allow showing

--- extra information section in case of multiple vim tabpages.

---

--- Features:

--- - Buffers are listed in the order of their identifier (see |bufnr()|).

--- - Different highlight groups for "states" of buffer affecting 'buffer tabs'.

--- - Buffer names are made unique by extending paths to files or appending

--- unique identifier to buffers without name.

--- - Current buffer is displayed "optimally centered" (in center of screen

--- while maximizing the total number of buffers shown) when there are many

--- buffers open.

--- - 'Buffer tabs' are clickable if Neovim allows it.

---

--- What it doesn't do:

--- - Custom buffer order is not supported.

---

--- # Dependencies~

---

--- Suggested dependencies (provide extra functionality, tabline will work

--- without them):

--- - Plugin 'kyazdani42/nvim-web-devicons' for filetype icons near the buffer

--- name. If missing, no icons will be shown.

---

--- # Setup~

---

--- This module needs a setup with `require('mini.tabline').setup({})`

--- (replace `{}` with your `config` table). It will create global Lua table

--- `MiniTabline` which you can use for scripting or manually (with

--- `:lua MiniTabline.*`).

---

--- See |MiniTabline.config| for `config` structure and default values.

---

--- You can override runtime config settings locally to buffer inside

--- `vim.b.minitabline_config` which should have same structure as

--- `MiniTabline.config`. See |mini.nvim-buffer-local-config| for more details.

---

--- # Highlight groups~

---

--- * `MiniTablineCurrent` - buffer is current (has cursor in it).

--- * `MiniTablineVisible` - buffer is visible (displayed in some window).

--- * `MiniTablineHidden` - buffer is hidden (not displayed).

--- * `MiniTablineModifiedCurrent` - buffer is modified and current.

--- * `MiniTablineModifiedVisible` - buffer is modified and visible.

--- * `MiniTablineModifiedHidden` - buffer is modified and hidden.

--- * `MiniTablineFill` - unused right space of tabline.

--- * `MiniTablineTabpagesection` - section with tabpage information.

---

--- To change any highlight group, modify it directly with |:highlight|.

---

--- # Disabling~

---

--- To disable (show empty tabline), set `g:minitabline_disable` (globally) or

--- `b:minitabline_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. Note: after disabling,

--- tabline is not updated right away, but rather after dedicated event (see

--- |events| and `MiniTabline` |augroup|).

---@tag mini.tabline

---@tag MiniTabline

-- Module definition ==========================================================

local MiniTabline = {}

local H = {}

--- Module setup

---

---@param config table Module config table. See |MiniTabline.config|.

---

---@usage `require('mini.tabline').setup({})` (replace `{}` with your `config` table)

MiniTabline.setup = function(config)

-- TODO: Remove after support for Neovim<0.6 is dropped

if vim.fn.has('nvim-0.6') == 0 then

vim.notify(

'(mini.tabline) Official support for Neovim<0.6 will soon be dropped. Update to a newer version of Neovim.'

)

end

-- Export module

_G.MiniTabline = MiniTabline

-- Setup config

config = H.setup_config(config)

-- Apply config

H.apply_config(config)

-- Function to make tabs clickable

vim.api.nvim_exec(

[[function! MiniTablineSwitchBuffer(buf_id, clicks, button, mod)

execute 'buffer' a:buf_id

endfunction]],

false

)

-- Create highlighting

vim.api.nvim_exec(

[[hi default link MiniTablineCurrent TabLineSel

hi default link MiniTablineVisible TabLineSel

hi default link MiniTablineHidden TabLine

hi default link MiniTablineModifiedCurrent StatusLine

hi default link MiniTablineModifiedVisible StatusLine

hi default link MiniTablineModifiedHidden StatusLineNC

hi default link MiniTablineTabpagesection Search

hi default MiniTablineFill NONE]],

false

)

end

--- Module config

---

--- Default values:

---@eval return MiniDoc.afterlines_to_code(MiniDoc.current.eval_section)

MiniTabline.config = {

-- Whether to show file icons (requires 'kyazdani42/nvim-web-devicons')

show_icons = true,

-- Whether to set Vim's settings for tabline (make it always shown and

-- allow hidden buffers)

set_vim_settings = true,

-- Where to show tabpage section in case of multiple vim tabpages.

-- One of 'left', 'right', 'none'.

tabpage_section = 'left',

}

--minidoc_afterlines_end

-- Module functionality =======================================================

--- Make string for |tabline|

MiniTabline.make_tabline_string = function()

if H.is_disabled() then return '' end

H.make_tabpage_section()

H.list_tabs()

H.finalize_labels()

H.fit_width()

return H.concat_tabs()

end

-- Helper data ================================================================

-- Module default config

H.default_config = MiniTabline.config

-- Table to keep track of tabs

H.tabs = {}

-- Indicator of whether there is clickable support

H.tablineat = vim.fn.has('tablineat')

-- Keep track of initially unnamed buffers

H.unnamed_buffers_seq_ids = {}

-- Separator of file path

H.path_sep = package.config:sub(1, 1)

-- String with tabpage prefix

H.tabpage_section = ''

-- Buffer number of center buffer

H.center_buf_id = 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({

show_icons = { config.show_icons, 'boolean' },

set_vim_settings = { config.set_vim_settings, 'boolean' },

tabpage_section = { config.tabpage_section, 'string' },

})

return config

end

H.apply_config = function(config)

MiniTabline.config = config

-- Set settings to ensure tabline is displayed properly

if config.set_vim_settings then

vim.o.showtabline = 2 -- Always show tabline

vim.o.hidden = true -- Allow switching buffers without saving them

end

-- Set tabline string

vim.o.tabline = '%!v:lua.MiniTabline.make_tabline_string()'

end

H.is_disabled = function() return vim.g.minitabline_disable == true or vim.b.minitabline_disable == true end

H.get_config = function(config)

return vim.tbl_deep_extend('force', MiniTabline.config, vim.b.minitabline_config or {}, config or {})

end

-- Work with tabpages ---------------------------------------------------------

H.make_tabpage_section = function()

local n_tabpages = vim.fn.tabpagenr('$')

if n_tabpages == 1 or H.get_config().tabpage_section == 'none' then

H.tabpage_section = ''

return

end

local cur_tabpagenr = vim.fn.tabpagenr()

H.tabpage_section = (' Tab %s/%s '):format(cur_tabpagenr, n_tabpages)

end

-- Work with tabs -------------------------------------------------------------

-- List tabs

H.list_tabs = function()

local tabs = {}

for _, buf_id in ipairs(vim.api.nvim_list_bufs()) do

if H.is_buffer_in_minitabline(buf_id) then

local tab = { buf_id = buf_id }

tab['hl'] = H.construct_highlight(buf_id)

tab['tabfunc'] = H.construct_tabfunc(buf_id)

tab['label'], tab['label_extender'] = H.construct_label_data(buf_id)

table.insert(tabs, tab)

end

H.tabs = tabs

end

H.is_buffer_in_minitabline = function(buf_id) return vim.api.nvim_buf_get_option(buf_id, 'buflisted') end

-- Tab's highlight group

H.construct_highlight = function(buf_id)

local hl_type

if buf_id == vim.api.nvim_get_current_buf() then

hl_type = 'Current'

elseif vim.fn.bufwinnr(buf_id) > 0 then

hl_type = 'Visible'

else

hl_type = 'Hidden'

end

if vim.api.nvim_buf_get_option(buf_id, 'modified') then hl_type = 'Modified' .. hl_type end

return string.format('%%#MiniTabline%s#', hl_type)

end

-- Tab's clickable action (if supported)

H.construct_tabfunc = function(buf_id)

if H.tablineat > 0 then

return string.format('%%%d@MiniTablineSwitchBuffer@', buf_id)

else

return ''

end

-- Tab's label and label extender

H.construct_label_data = function(buf_id)

local label, label_extender

local bufpath = vim.api.nvim_buf_get_name(buf_id)

if bufpath ~= '' then

-- Process path buffer

label = vim.fn.fnamemodify(bufpath, ':t')

label_extender = H.make_path_extender(buf_id)

else

-- Process unnamed buffer

label = H.make_unnamed_label(buf_id)

label_extender = function(x) return x end

end

return label, label_extender

end

H.make_path_extender = function(buf_id)

-- Add parent to current label (if possible)

return function(label)

local full_path = vim.api.nvim_buf_get_name(buf_id)

-- Using `vim.pesc` prevents effect of problematic characters (like '.')

local pattern = string.format('[^%s]+%s%s$', vim.pesc(H.path_sep), vim.pesc(H.path_sep), vim.pesc(label))

return string.match(full_path, pattern) or label

end

-- Work with unnamed buffers --------------------------------------------------

-- Unnamed buffers are tracked in `H.unnamed_buffers_seq_ids` for

-- disambiguation. This table is designed to store 'sequential' buffer

-- identifier. This approach allows to have the following behavior:

-- - Create three unnamed buffers.

-- - Delete second one.

-- - Tab label for third one remains the same.

H.make_unnamed_label = function(buf_id)

local label

if vim.api.nvim_buf_get_option(buf_id, 'buftype') == 'quickfix' then

-- It would be great to differentiate for buffer `buf_id` between quickfix

-- and location lists but it seems there is no reliable way to do so.

-- The only one is to use `getwininfo(bufwinid(buf_id))` and look for

-- `quickfix` and `loclist` fields, but that fails if buffer `buf_id` is

-- not visible.

label = '*quickfix*'

else

label = H.is_buffer_scratch(buf_id) and '!' or '*'

end

-- Possibly add tracking id

local unnamed_id = H.get_unnamed_id(buf_id)

if unnamed_id > 1 then label = string.format('%s(%d)', label, unnamed_id) end

return label

end

H.is_buffer_scratch = function(buf_id)

local buftype = vim.api.nvim_buf_get_option(buf_id, 'buftype')

return (buftype == 'acwrite') or (buftype == 'nofile')

end

H.get_unnamed_id = function(buf_id)

-- Use existing sequential id if possible

local seq_id = H.unnamed_buffers_seq_ids[buf_id]

if seq_id ~= nil then return seq_id end

-- Cache sequential id for currently unnamed buffer `buf_id`

H.unnamed_buffers_seq_ids[buf_id] = vim.tbl_count(H.unnamed_buffers_seq_ids) + 1

return H.unnamed_buffers_seq_ids[buf_id]

end

-- Work with labels -----------------------------------------------------------

H.finalize_labels = function()

-- Deduplicate

local nonunique_tab_ids = H.get_nonunique_tab_ids()

while #nonunique_tab_ids > 0 do

local nothing_changed = true

-- Extend labels

for _, buf_id in ipairs(nonunique_tab_ids) do

local tab = H.tabs[buf_id]

local old_label = tab.label

tab.label = tab.label_extender(tab.label)

if old_label ~= tab.label then nothing_changed = false end

end

if nothing_changed then break end

nonunique_tab_ids = H.get_nonunique_tab_ids()

end

-- Postprocess: add file icons and padding

local has_devicons, devicons

local show_icons = H.get_config().show_icons

-- Have this `require()` here to not depend on plugin initialization order

if show_icons then

has_devicons, devicons = pcall(require, 'nvim-web-devicons')

end

for _, tab in pairs(H.tabs) do

if show_icons and has_devicons then

local extension = vim.fn.fnamemodify(tab.label, ':e')

local icon = devicons.get_icon(tab.label, extension, { default = true })

tab.label = string.format(' %s %s ', icon, tab.label)

else

tab.label = string.format(' %s ', tab.label)

end

---@return table Array of `H.tabs` ids which have non-unique labels.

---@private

H.get_nonunique_tab_ids = function()

-- Collect tab-array-id per label

local label_tab_ids = {}

for i, tab in ipairs(H.tabs) do

local label = tab.label

if label_tab_ids[label] == nil then

label_tab_ids[label] = { i }

else

table.insert(label_tab_ids[label], i)

end

A15E end

-- Collect tab-array-ids with non-unique labels

return vim.tbl_flatten(vim.tbl_filter(function(x) return #x > 1 end, label_tab_ids))

end

-- Fit tabline to maximum displayed width -------------------------------------

H.fit_width = function()

H.update_center_buf_id()

-- Compute label width data

local center_offset = 1

local tot_width = 0

for _, tab in pairs(H.tabs) do

-- Use `nvim_strwidth()` and not `:len()` to respect multibyte characters

tab.label_width = vim.api.nvim_strwidth(tab.label)

tab.chars_on_left = tot_width

tot_width = tot_width + tab.label_width

if tab.buf_id == H.center_buf_id then

-- Make right end of 'center tab' to be always displayed in center in

-- case of truncation

center_offset = tot_width

end

local display_interval = H.compute_display_interval(center_offset, tot_width)

H.truncate_tabs_display(display_interval)

end

H.update_center_buf_id = function()

local cur_buf = vim.api.nvim_get_current_buf()

if H.is_buffer_in_minitabline(cur_buf) then H.center_buf_id = cur_buf end

end

H.compute_display_interval = function(center_offset, tabline_width)

-- left - first character to be displayed (starts with 1)

-- right - last character to be displayed

-- Conditions to be satisfied:

-- 1) right - left + 1 = math.min(tot_width, tabline_width)

-- 2) 1 <= left <= tabline_width; 1 <= right <= tabline_width

local tot_width = vim.o.columns - vim.api.nvim_strwidth(H.tabpage_section)

-- Usage of `math.floor` is crucial to avoid non-integer values which might

-- affect total width of output tabline string.

-- Using `floor` instead of `ceil` has effect when `tot_width` is odd:

-- - `floor` makes "true center" to be between second to last and last label

-- character (usually non-space and space).

-- - `ceil` - between last character of center label and first character of

-- next label (both whitespaces).

local right = math.min(tabline_width, math.floor(center_offset + 0.5 * tot_width))

local left = math.max(1, right - tot_width + 1)

right = left + math.min(tot_width, tabline_width) - 1

return { left, right }

end

H.truncate_tabs_display = function(display_interval)

local display_left, display_right = display_interval[1], display_interval[2]

local tabs = {}

for _, tab in ipairs(H.tabs) do

local tab_left = tab.chars_on_left + 1

local tab_right = tab.chars_on_left + tab.label_width

if (display_left <= tab_right) and (tab_left <= display_right) then

-- Process tab that should be displayed (even partially)

local n_trunc_left = math.max(0, display_left - tab_left)

local n_trunc_right = math.max(0, tab_right - display_right)

-- Take desired amount of characters starting from `n_trunc_left`

tab.label = vim.fn.strcharpart(tab.label, n_trunc_left, tab.label_width - n_trunc_right)

table.insert(tabs, tab)

end

H.tabs = tabs

end

-- Concatenate tabs into single tablien string --------------------------------

H.concat_tabs = function()

-- NOTE: it is assumed that all padding is incorporated into labels

local t = {}

for _, tab in ipairs(H.tabs) do

-- Escape '%' in labels

table.insert(t, ('%s%s%s'):format(tab.hl, tab.tabfunc, tab.label:gsub('%%', '%%%%')))

end

-- Usage of `%X` makes filled space to the right 'non-clickable'

local res = ('%s%%X%%#MiniTablineFill#'):format(table.concat(t, ''))

-- Add tabpage section

local position = H.get_config().tabpage_section

if H.tabpage_section ~= '' then

if not vim.tbl_contains({ 'none', 'left', 'right' }, position) then

H.message([[`config.tabpage_section` should be one of 'left', 'right', 'none'.]])

end

if position == 'left' then res = ('%%#MiniTablineTabpagesection#%s%s'):format(H.tabpage_section, res) end

if position == 'right' then

-- Use `%=` to make it stick to right hand side

res = ('%s%%=%%#MiniTablineTabpagesection#%s'):format(res, H.tabpage_section)

end

return res

end

-- Utilities ------------------------------------------------------------------

H.message = function(msg) vim.cmd('echomsg ' .. vim.inspect('(mini.tabline) ' .. msg)) end

return MiniTabline

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