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dropbar.nvim

IDE-like breadcrumbs, out of the box

A polished, IDE-like, highly-customizable winbar for Neovim
with drop-down menu support and multiple backends

docs luarocks

Features and TODOs

dropbar-demo-light.mp4

  • Opening drop-down menus or go to definition with a single mouse click

    mouse-click

  • Pick mode for quickly selecting a component in the winbar with shortcuts

    pick-mode

  • Automatically truncating long components

    auto-truncate

    • Better truncation when winbar is still too long after shortening all components

  • Multiple backends that support fall-backs

    dropbar.nvim comes with five builtin sources:

    • lsp: gets symbols from language servers using nvim's builtin LSP framework

    • markdown: a custom incremental parser that gets symbol information about markdown headings

    • path: gets current file path

    • treesitter: gets symbols from treesitter parsers using nvim's builtin treesitter integration

    • terminal: easily switch terminal buffers using the dropdown menu

    To make a new source yourself, see making a new source.

    For source fall-backs support, see bar options.

  • Zero config & Zero dependency

    dropbar.nvim does not require nvim-lspconfig, nvim-treesitter or any third-party UI libraries to work. As long as the language server or the treesitter parser is installed, it should work just fine.

    Optionally, you can install telescope-fzf-native to add fuzzy search support to dropbar menus.

  • Drop-down menu components and winbar symbols that response to mouse/cursor hovering:

    hover

    • This features requires :h mousemoveevent to be enabled.

  • Preview symbols in their source windows when hovering over them in the drop-down menu

    preview

  • Reorient the source window on previewing or after jumping to a symbol

  • Add scrollbar to the menu when the symbol list is too long

    scrollbar

  • Background color support* thanks @theofabilous

    background-color

  • Add preview for symbols shown in the winbar

  • Preview symbols (files) from path source

  • Support visual mode selection to select/delete multiple symbols

  • Ability to hide/show the winbar on each window separately

  • Add more tests for the sources path, lsp, and treesitter

  • Configurable scrollbar appearance

  • Update winbar sources dynamically

  • More responsive mouse clicking & hovering in insert (fzf) mode, like in normal mode

Requirements

  • Neovim Nightly (>= 0.10.0-dev)
  • Optional
    • nvim-web-devicons, if you want to see icons for different filetypes
    • telescope-fzf-native, if you want fuzzy search support
    • Working language server installation for the lsp source to work
    • Working treesitter parser installation for the treesitter source to work

Installation

  • Using lazy.nvim

    require('lazy').setup({
  {
    'Bekaboo/dropbar.nvim',
    -- optional, but required for fuzzy finder support
    dependencies = {
      'nvim-telescope/telescope-fzf-native.nvim'
    }
  }
})

  • Using packer.nvim

    require('packer').startup(function(use)
  use({
    'Bekaboo/dropbar.nvim',
    requires = {
      'nvim-telescope/telescope-fzf-native.nvim'
    }
  })
end)

  • Using native package manager

    mkdir -p ~/.local/share/nvim/site/pack/packages/
git clone https://github.com/Bekaboo/dropbar.nvim ~/.local/share/nvim/site/pack/packages/start/dropbar.nvim

    Lazy-loading is unneeded as it is already done in plugin/dropbar.lua.

Usage

  • Basics
    • Moves the cursor around and see the winbar reflects your current context
  • Mouse support
    • Click on a component in the winbar to open a drop-down menu of its siblings
    • Click on an entry in the drop-down menu to go to its location
    • Click on the indicator in the drop-down menu to open a sub-menu of its children
  • Pick mode
    • Use require('dropbar.api').pick() to enter interactive pick mode or require('dropbar.api').pick(<idx>) to directly select a component at idx.
    • Inside interactive pick mode, press the corresponding pivot shown before each component to select it
  • Fuzzy finder
    • Use dropbar_menu_t:fuzzy_find_open() to interactively filter, select and preview entries using fzf
    • <Esc>: exit fzf mode
    • <Up>/<Down>: move the cursor in fzf mode
    • <CR>: call the on_click callback of the symbol under the cursor
  • Default keymaps in drop-down menu
    • <LeftMouse>: call the on_click callback of the symbol at the mouse click
    • <CR>: find the first clickable symbol in the current drop-down menu entry and call its on_click callback
    • i: enter fzf mode from the menu
    • q / <Esc>: close current menu
    • To disable, remap or add new keymaps in the drop-down menu, see menu options

Usage with vim.ui.select

Dropbar can be used as a drop-in replacement for Neovim's builtin vim.ui.select menu.

To enable this functionality, simply replace vim.ui.select with dropbar.utils.menu.select:

vim.ui.select = require('dropbar.utils.menu').select

Configuration

Options

A full list of all available options and their default values: 
---@class dropbar_configs_t
M.opts = {
  general = {
    ---@type boolean|fun(buf: integer, win: integer, info: table?): boolean
    enable = function(buf, win, _)
      return vim.fn.win_gettype(win) == ''
        and vim.wo[win].winbar == ''
        and vim.bo[buf].bt == ''
        and (
          vim.bo[buf].ft == 'markdown'
          or (
            buf
              and vim.api.nvim_buf_is_valid(buf)
              and (pcall(vim.treesitter.get_parser, buf, vim.bo[buf].ft))
              and true
            or false
          )
        )
    end,
    attach_events = {
      'OptionSet',
      'BufWinEnter',
      'BufWritePost',
    },
    -- Wait for a short time before updating the winbar, if another update
    -- request is received within this time, the previous request will be
    -- cancelled, this improves the performance when the user is holding
    -- down a key (e.g. 'j') to scroll the window, default to 0 ms
    -- If you encounter performance issues when scrolling the window, try
    -- setting this option to a number slightly larger than
    -- 1000 / key_repeat_rate
    update_interval = 0,
    update_events = {
      win = {
        'CursorMoved',
        'CursorMovedI',
        'WinEnter',
        'WinResized',
      },
      buf = {
        'BufModifiedSet',
        'FileChangedShellPost',
        'TextChanged',
        'TextChangedI',
      },
      global = {
        'DirChanged',
        'VimResized',
      },
    },
  },
  icons = {
    enable = true,
    kinds = {
      use_devicons = true,
      symbols = {
        Array = '󰅪 ',
        Boolean = '',
        BreakStatement = '󰙧 ',
        Call = '󰃷 ',
        CaseStatement = '󱃙 ',
        Class = '',
        Color = '󰏘 ',
        Constant = '󰏿 ',
        Constructor = '',
        ContinueStatement = '→ ',
        Copilot = '',
        Declaration = '󰙠 ',
        Delete = '󰩺 ',
        DoStatement = '󰑖 ',
        Enum = '',
        EnumMember = '',
        Event = '',
        Field = '',
        File = '󰈔 ',
        Folder = '󰉋 ',
        ForStatement = '󰑖 ',
        Function = '󰊕 ',
        H1Marker = '󰉫 ', -- Used by markdown treesitter parser
        H2Marker = '󰉬 ',
        H3Marker = '󰉭 ',
        H4Marker = '󰉮 ',
        H5Marker = '󰉯 ',
        H6Marker = '󰉰 ',
        Identifier = '󰀫 ',
        IfStatement = '󰇉 ',
        Interface = '',
        Keyword = '󰌋 ',
        List = '󰅪 ',
        Log = '󰦪 ',
        Lsp = '',
        Macro = '󰁌 ',
        MarkdownH1 = '󰉫 ', -- Used by builtin markdown source
        MarkdownH2 = '󰉬 ',
        MarkdownH3 = '󰉭 ',
        MarkdownH4 = '󰉮 ',
        MarkdownH5 = '󰉯 ',
        MarkdownH6 = '󰉰 ',
        Method = '󰆧 ',
        Module = '󰏗 ',
        Namespace = '󰅩 ',
        Null = '󰢤 ',
        Number = '󰎠 ',
        Object = '󰅩 ',
        Operator = '󰆕 ',
        Package = '󰆦 ',
        Pair = '󰅪 ',
        Property = '',
        Reference = '󰦾 ',
        Regex = '',
        Repeat = '󰑖 ',
        Scope = '󰅩 ',
        Snippet = '󰩫 ',
        Specifier = '󰦪 ',
        Statement = '󰅩 ',
        String = '󰉾 ',
        Struct = '',
        SwitchStatement = '󰺟 ',
        Terminal = '',
        Text = '',
        Type = '',
        TypeParameter = '󰆩 ',
        Unit = '',
        Value = '󰎠 ',
        Variable = '󰀫 ',
        WhileStatement = '󰑖 ',
      },
    },
    ui = {
      bar = {
        separator = '',
        extends = '…',
      },
      menu = {
        separator = ' ',
        indicator = '',
      },
    },
  },
  symbol = {
    preview = {
      ---Reorient the preview window on previewing a new symbol
      ---@param _ integer source window id, ignored
      ---@param range {start: {line: integer}, end: {line: integer}} 0-indexed
      reorient = function(_, range)
        local invisible = range['end'].line - vim.fn.line('w$') + 1
        if invisible > 0 then
          local view = vim.fn.winsaveview() --[[@as vim.fn.winrestview.dict]]
          view.topline = math.min(
            view.topline + invisible,
            math.max(1, range.start.line - vim.wo.scrolloff + 1)
          )
          vim.fn.winrestview(view)
        end
      end,
    },
    jump = {
      ---@param win integer source window id
      ---@param range {start: {line: integer}, end: {line: integer}} 0-indexed
      reorient = function(win, range)
        local view = vim.fn.winsaveview()
        local win_height = vim.api.nvim_win_get_height(win)
        local topline = range.start.line - math.floor(win_height / 4)
        if
          topline > view.topline
          and topline + win_height < vim.fn.line('$')
        then
          view.topline = topline
          vim.fn.winrestview(view)
        end
      end,
    },
  },
  bar = {
    hover = true,
    ---@type dropbar_source_t[]|fun(buf: integer, win: integer): dropbar_source_t[]
    sources = function(buf, _)
      local sources = require('dropbar.sources')
      if vim.bo[buf].ft == 'markdown' then
        return {
          sources.path,
          sources.markdown,
        }
      end
      if vim.bo[buf].buftype == 'terminal' then
        return {
          sources.terminal,
        }
      end
      return {
        sources.path,
        utils.source.fallback({
          sources.lsp,
          sources.treesitter,
        }),
      }
    end,
    padding = {
      left = 1,
      right = 1,
    },
    pick = {
      pivots = 'abcdefghijklmnopqrstuvwxyz',
    },
    truncate = true,
  },
  menu = {
    -- When on, preview the symbol under the cursor on CursorMoved
    preview = true,
    -- When on, automatically set the cursor to the closest previous/next
    -- clickable component in the direction of cursor movement on CursorMoved
    quick_navigation = true,
    entry = {
      padding = {
        left = 1,
        right = 1,
      },
    },
    -- Menu scrollbar options
    scrollbar = {
      enable = true,
      -- The background / gutter of the scrollbar
      -- When false, only the scrollbar thumb is shown.
      background = true
    },
    ---@type table<string, string|function|table<string, string|function>>
  keymaps = {
    ['q'] = '<C-w>q',
    ['<Esc>'] = '<C-w>q',
    ['<LeftMouse>'] = function()
      local menu = utils.menu.get_current()
      if not menu then
        return
      end
      local mouse = vim.fn.getmousepos()
      local clicked_menu = utils.menu.get({ win = mouse.winid })
      -- If clicked on a menu, invoke the corresponding click action,
      -- else close all menus and set the cursor to the clicked window
      if clicked_menu then
        clicked_menu:click_at({ mouse.line, mouse.column - 1 }, nil, 1, 'l')
        return
      end
      utils.menu.exec('close')
      utils.bar.exec('update_current_context_hl')
      if vim.api.nvim_win_is_valid(mouse.winid) then
        vim.api.nvim_set_current_win(mouse.winid)
      end
    end,
    ['<CR>'] = function()
      local menu = utils.menu.get_current()
      if not menu then
        return
      end
      local cursor = vim.api.nvim_win_get_cursor(menu.win)
      local component = menu.entries[cursor[1]]:first_clickable(cursor[2])
      if component then
        menu:click_on(component, nil, 1, 'l')
      end
    end,
    ['<MouseMove>'] = function()
      local menu = utils.menu.get_current()
      if not menu then
        return
      end
      local mouse = vim.fn.getmousepos()
      utils.menu.update_hover_hl(mouse)
      if M.opts.menu.preview then
        utils.menu.update_preview(mouse)
      end
    end,
    ['i'] = function()
      local menu = utils.menu.get_current()
      if not menu then
        return
      end
      menu:fuzzy_find_open()
    end,
  },
    ---@alias dropbar_menu_win_config_opts_t any|fun(menu: dropbar_menu_t):any
    ---@type table<string, dropbar_menu_win_config_opts_t>
    ---@see vim.api.nvim_open_win
    win_configs = {
      border = 'none',
      style = 'minimal',
      row = function(menu)
        return menu.prev_menu
            and menu.prev_menu.clicked_at
            and menu.prev_menu.clicked_at[1] - vim.fn.line('w0')
          or 0
      end,
      ---@param menu dropbar_menu_t
      col = function(menu)
        if menu.prev_menu then
          return menu.prev_menu._win_configs.width
            + (
              menu.prev_menu.scrollbar
                and menu.prev_menu.scrollbar.background
                and 1
              or 0
            )
        end
        local mouse = vim.fn.getmousepos()
        local bar = utils.bar.get({ win = menu.prev_win })
        if not bar then
          return mouse.wincol
        end
        local _, range = bar:get_component_at(math.max(0, mouse.wincol - 1))
        return range and range.start or mouse.wincol
      end,
      relative = 'win',
      win = function(menu)
        return menu.prev_menu and menu.prev_menu.win
          or vim.fn.getmousepos().winid
      end,
      height = function(menu)
        return math.max(
          1,
          math.min(
            #menu.entries,
            vim.go.pumheight ~= 0 and vim.go.pumheight
              or math.ceil(vim.go.lines / 4)
          )
        )
      end,
      width = function(menu)
        local min_width = vim.go.pumwidth ~= 0 and vim.go.pumwidth or 8
        if vim.tbl_isempty(menu.entries) then
          return min_width
        end
        return math.max(
          min_width,
          math.max(unpack(vim.tbl_map(function(entry)
            return entry:displaywidth()
          end, menu.entries)))
        )
      end,
      zindex = function(menu)
        if menu.prev_menu then
          if menu.prev_menu.scrollbar and menu.prev_menu.scrollbar.thumb then
            return vim.api.nvim_win_get_config(menu.prev_menu.scrollbar.thumb).zindex
          end
          return vim.api.nvim_win_get_config(menu.prev_win).zindex
        end
      end,
    },
  },
  fzf = {
    ---@type table<string, string | fun()>
    keymaps = {
      ['<LeftMouse>'] = function()
        ---@type dropbar_menu_t
        local menu = utils.menu.get_current()
        if not menu then
          return
        end
        local mouse = vim.fn.getmousepos()
        if not mouse then
          return
        end
        if mouse.winid ~= menu.win then
          local default_func = M.opts.menu.keymaps['<LeftMouse>']
          if type(default_func) == 'function' then
            default_func()
          end
          menu:fuzzy_find_close()
          return
        elseif mouse.winrow > vim.api.nvim_buf_line_count(menu.buf) then
          return
        end
        vim.api.nvim_win_set_cursor(menu.win, { mouse.line, mouse.column - 1 })
        menu:fuzzy_find_click_on_entry(function(entry)
          return entry:get_component_at(mouse.column - 1, true)
        end)
      end,
      ['<MouseMove>'] = function()
        ---@type dropbar_menu_t
        local menu = utils.menu.get_current()
        if not menu then
          return
        end
        local mouse = vim.fn.getmousepos()
        if not mouse then
          return
        end
        -- If mouse is not in the menu window or on the border, end preview
        -- and clear hover highlights
        if
          mouse.winid ~= menu.win
          or mouse.line <= 0
          or mouse.column <= 0
          or mouse.winrow > (#menu.entries + 1)
        then
          -- Find the root menu
          while menu and menu.prev_menu do
            menu = menu.prev_menu
          end
          if menu then
            menu:finish_preview(true)
            menu:update_hover_hl()
          end
          return
        end
        if M.opts.menu.preview then
          menu:preview_symbol_at({ mouse.line, mouse.column - 1 }, true)
        end
        menu:update_hover_hl({ mouse.line, mouse.column - 1 })
      end,
      ['<Up>'] = api.fuzzy_find_prev,
      ['<Down>'] = api.fuzzy_find_next,
      ['<C-k>'] = api.fuzzy_find_prev,
      ['<C-j>'] = api.fuzzy_find_next,
      ['<C-p>'] = api.fuzzy_find_prev,
      ['<C-n>'] = api.fuzzy_find_next,
      ['<Enter>'] = api.fuzzy_find_click,
      ['<S-Enter>'] = function()
        api.fuzzy_find_click(-1)
      end,
    },
    win_configs = {
      relative = 'win',
      anchor = 'NW',
      height = 1,
      win = function(menu)
        return menu.win
      end,
      width = function(menu)
        local function border_width(border)
          if type(border) == 'string' then
            if border == 'none' or border == 'shadow' then
              return 0
            end
            return 2 -- left and right border
          end

          local left, right = 1, 1
          if
            (#border == 1 and border[1] == '')
            or (#border == 4 and border[4] == '')
            or (#border == 8 and border[8] == '')
          then
            left = 0
          end
          if
            (#border == 1 and border[1] == '')
            or (#border == 4 and border[4] == '')
            or (#border == 8 and border[4] == '')
          then
            right = 0
          end
          return left + right
        end
        local menu_width = menu._win_configs.width
          + border_width(menu._win_configs.border)
        local self_width = menu._win_configs.width
        local self_border = border_width(
          (
            M.opts.fzf.win_configs
            and M.eval(M.opts.fzf.win_configs.border, menu)
          )
            or (menu.fzf_win_configs and M.eval(
              menu.fzf_win_configs.border,
              menu
            ))
            or menu._win_configs.border
        )

        if self_width + self_border > menu_width then
          return self_width - self_border
        else
          return menu_width - self_border
        end
      end,
      row = function(menu)
        local menu_border = menu._win_configs.border
        if
          type(menu_border) == 'string'
          and menu_border ~= 'shadow'
          and menu_border ~= 'none'
        then
          return menu._win_configs.height + 1
        elseif menu_border == 'none' then
          return menu._win_configs.height
        end
        local len_menu_border = #menu_border
        if
          len_menu_border == 1 and menu_border[1] ~= ''
          or (len_menu_border == 2 or len_menu_border == 4) and menu_border[2] ~= ''
          or len_menu_border == 8 and menu_border[8] ~= ''
        then
          return menu._win_configs.height + 1
        else
          return menu._win_configs.height
        end
      end,
      col = function(menu)
        local menu_border = menu._win_configs.border
        if
          type(menu_border) == 'string'
          and menu_border ~= 'shadow'
          and menu_border ~= 'none'
        then
          return -1
        end
        if
          type(menu_border) == 'table' and menu_border[#menu_border] ~= ''
        then
          return -1
        end
        return 0
      end,
    },
    prompt = '%#htmlTag# ',
    char_pattern = '[%w%p]',
    retain_inner_spaces = true,
    fuzzy_find_on_click = true,
  },
  sources = {
    path = {
      ---@type string|fun(buf: integer, win: integer): string
      relative_to = function(_, win)
        -- Workaround for Vim:E5002: Cannot find window number
        local ok, cwd = pcall(vim.fn.getcwd, win)
        return ok and cwd or vim.fn.getcwd()
      end,
      ---Can be used to filter out files or directories
      ---based on their name
      ---@type fun(name: string): boolean
      filter = function(_)
        return true
      end,
      ---Last symbol from path source when current buf is modified
      ---@param sym dropbar_symbol_t
      ---@return dropbar_symbol_t
      modified = function(sym)
        return sym
      end,
      ---@type boolean|fun(path: string): boolean?|nil
      preview = function(path)
        local stat = vim.uv.fs_stat(path)
        return stat and stat.type == 'file' and stat.size <= 524288
      end,
    },
    treesitter = {
      -- Lua pattern used to extract a short name from the node text
      name_pattern = '[#~%*%w%._%->!@:]+%s*'
        .. string.rep('[#~%*%w%._%->!@:]*', 3, '%s*'),
      -- The order matters! The first match is used as the type
      -- of the treesitter symbol and used to show the icon
      -- Types listed below must have corresponding icons
      -- in the `icons.kinds.symbols` table for the icon to be shown
      valid_types = {
        'array',
        'boolean',
        'break_statement',
        'call',
        'case_statement',
        'class',
        'constant',
        'constructor',
        'continue_statement',
        'delete',
        'do_statement',
        'enum',
        'enum_member',
        'event',
        'for_statement',
        'function',
        'h1_marker',
        'h2_marker',
        'h3_marker',
        'h4_marker',
        'h5_marker',
        'h6_marker',
        'if_statement',
        'interface',
        'keyword',
        'list',
        'macro',
        'method',
        'module',
        'namespace',
        'null',
        'number',
        'operator',
        'package',
        'pair',
        'property',
        'reference',
        'repeat',
        'scope',
        'specifier',
        'string',
        'struct',
        'switch_statement',
        'type',
        'type_parameter',
        'unit',
        'value',
        'variable',
        'while_statement',
        'declaration',
        'field',
        'identifier',
        'object',
        'statement',
        'text',
      },
    },
    lsp = {
      request = {
        -- Times to retry a request before giving up
        ttl_init = 60,
        interval = 1000, -- in ms
      },
    },
    markdown = {
      parse = {
        -- Number of lines to update when cursor moves out of the parsed range
        look_ahead = 200,
      },
    },
    terminal = {
      ---@type string|fun(buf: integer): string
      icon = function(buf)
        local icon = M.opts.icons.kinds.symbols.Terminal
        if M.opts.icons.kinds.use_devicons then
          icon = require('nvim-web-devicons').get_icon_by_filetype(
            vim.bo[buf].filetype
          ) or icon
        end
        return icon
      end,
      ---@type string|fun(buf: integer): string
      name = vim.api.nvim_buf_get_name,
      ---@type boolean
      ---Show the current terminal buffer in the menu
      show_current = true,
    },
  },
}

General

These options live under opts.general and are used to configure the general behavior of the plugin:

  • opts.general.enable: boolean|fun(buf: integer, win: integer): boolean
    • Controls whether to enable the plugin for the current buffer and window
    • If a function is provided, it will be called with the current bufnr and winid and should return a boolean
    • Default: 
      function(buf, win)
  return vim.fn.win_gettype(win) == ''
    and vim.wo[win].winbar == ''
    and vim.bo[buf].bt == ''
    and (
      vim.bo[buf].ft == 'markdown'
      or (
        buf
          and vim.api.nvim_buf_is_valid(buf)
          and (pcall(vim.treesitter.get_parser, buf, vim.bo[buf].ft))
          and true
        or false
      )
    )
end
  • opts.general.attach_events: string[]
    • Controls when to evaluate the enable() function and attach the plugin to corresponding buffer or window
    • Default: 
      {
  'OptionSet',
  'BufWinEnter',
  'BufWritePost',
}
  • opts.general.update_interval: number
    • Wait for a short time before updating the winbar, if another update request is received within this time, the previous request will be cancelled, this improves the performance when the user is holding down a key (e.g. 'j') to scroll the window
    • If you encounter performance issues when scrolling the window, try setting this option to a number slightly larger than 1000 / key_repeat_rate
    • Default: 0
  • opts.general.update_events.win: string[]
    • List of events that should trigger an update on the dropbar attached to a single window
    • Default: 
      {
  'CursorMoved',
  'CursorMovedI',
  'WinEnter',
  'WinResized',
}
  • opts.general.update_events.buf: string[]
    • List of events that should trigger an update on all dropbars attached to a buffer
    • Default: 
      {
  'BufModifiedSet',
  'FileChangedShellPost',
  'TextChanged',
  'TextChangedI',
}
  • opts.general.update_events.global: string[]
    • List of events that should trigger an update of all dropbars in current nvim session
    • Default: 
      {
  'DirChanged',
  'VimResized',
}

Icons

These options live under opts.icons and are used to configure the icons used by the plugin:

  • opts.icons.enable: boolean
    • Whether to enable icons
    • Default: true
  • opts.icons.kinds.use_devicons: boolean
    • Whether to use nvim-web-devicons to show icons for different filetypes
    • Default: true
  • opts.icons.kinds.symbols: table<string, string>
    • Table mapping the different kinds of symbols to their corresponding icons
    • Default: 
      {
  Array = '󰅪 ',
  Boolean = '',
  BreakStatement = '󰙧 ',
  Call = '󰃷 ',
  CaseStatement = '󱃙 ',
  Class = '',
  Color = '󰏘 ',
  Constant = '󰏿 ',
  Constructor = '',
  ContinueStatement = '→ ',
  Copilot = '',
  Declaration = '󰙠 ',
  Delete = '󰩺 ',
  DoStatement = '󰑖 ',
  Enum = '',
  EnumMember = '',
  Event = '',
  Field = '',
  File = '󰈔 ',
  Folder = '󰉋 ',
  ForStatement = '󰑖 ',
  Function = '󰊕 ',
  H1Marker = '󰉫 ', -- Used by markdown treesitter parser
  H2Marker = '󰉬 ',
  H3Marker = '󰉭 ',
  H4Marker = '󰉮 ',
  H5Marker = '󰉯 ',
  H6Marker = '󰉰 ',
  Identifier = '󰀫 ',
  IfStatement = '󰇉 ',
  Interface = '',
  Keyword = '󰌋 ',
  List = '󰅪 ',
  Log = '󰦪 ',
  Lsp = '',
  Macro = '󰁌 ',
  MarkdownH1 = '󰉫 ', -- Used by builtin markdown source
  MarkdownH2 = '󰉬 ',
  MarkdownH3 = '󰉭 ',
  MarkdownH4 = '󰉮 ',
  MarkdownH5 = '󰉯 ',
  MarkdownH6 = '󰉰 ',
  Method = '󰆧 ',
  Module = '󰏗 ',
  Namespace = '󰅩 ',
  Null = '󰢤 ',
  Number = '󰎠 ',
  Object = '󰅩 ',
  Operator = '󰆕 ',
  Package = '󰆦 ',
  Pair = '󰅪 ',
  Property = '',
  Reference = '󰦾 ',
  Regex = '',
  Repeat = '󰑖 ',
  Scope = '󰅩 ',
  Snippet = '󰩫 ',
  Specifier = '󰦪 ',
  Statement = '󰅩 ',
  String = '󰉾 ',
  Struct = '',
  SwitchStatement = '󰺟 ',
  Terminal = '',
  Text = '',
  Type = '',
  TypeParameter = '󰆩 ',
  Unit = '',
  Value = '󰎠 ',
  Variable = '󰀫 ',
  WhileStatement = '󰑖 ',
}
  • opts.icons.ui.bar: table<string, string>
    • Controls the icons used in the winbar UI
    • Default: 
      {
  separator = '',
  extends = '…',
}
  • opts.icons.ui.menu: table<string, string>
    • Controls the icons used in the menu UI
    • Default: 
      {
  separator = ' ',
  indicator = '',
}

Symbol

These options live under opts.symbol and are used to control the behavior of the symbols:

  • opts.symbol.preview.reorient: fun(win: integer, range: {start: {line: integer, character: integer}, end: {line: integer, character: integer}})
    • Function to reorient the source window when previewing symbol given the source window win and the range of the symbol range
    • Default: 
      function(_, range)
  local invisible = range['end'].line - vim.fn.line('w$') + 1
  if invisible > 0 then
    local view = vim.fn.winsaveview() --[[@as vim.fn.winrestview.dict]]
    view.topline = math.min(
      view.topline + invisible,
      math.max(1, range.start.line - vim.wo.scrolloff + 1)
    )
    vim.fn.winrestview(view)
  end
end
  • opts.symbol.jump.reorient: fun(win: integer, range: {start: {line: integer, character: integer}, end: {line: integer, character: integer}})
    • Function to reorient the source window after jumping to symbol given the source window win and the range of the symbol range
    • Default: 
      function(win, range)
  local view = vim.fn.winsaveview()
  local win_height = vim.api.nvim_win_get_height(win)
  local topline = range.start.line - math.floor(win_height / 4)
  if
    topline > view.topline
    and topline + win_height < vim.fn.line('$')
  then
    view.topline = topline
    vim.fn.winrestview(view)
  end
end

Bar

These options live under opts.bar and are used to control the behavior of the winbar:

  • opts.bar.hover: boolean
    • Whether to highlight the symbol under the cursor
    • This feature requires 'mousemoveevent' to be enabled
    • Default: true
  • opts.bar.sources: dropbar_source_t[]|fun(buf: integer, win: integer): dropbar_source_t[]
    • List of sources to show in the winbar
    • If a function is provided, it will be called with the current bufnr and winid and should return a list of sources
    • Default: 
      function(buf, _)
  local sources = require('dropbar.sources')
  local utils = require('dropbar.utils')
  if vim.bo[buf].ft == 'markdown' then
    return {
      sources.path,
      sources.markdown,
    }
  end
  if vim.bo[buf].buftype == 'terminal' then
    return {
      sources.terminal,
    }
  end
  return {
    sources.path,
    utils.source.fallback({
      sources.lsp,
      sources.treesitter,
    }),
  }
end
    • For more information about sources, see dropbar_source_t.
  • opts.bar.padding: { left: number, right: number }
    • Padding to use between the winbar and the window border
    • Default: { left = 1, right = 1 }
  • opts.bar.pick.pivots: string
    • Pivots to use in pick mode
    • Default: 'abcdefghijklmnopqrstuvwxyz'
  • opts.bar.truncate: boolean
    • Whether to truncate the winbar if it doesn't fit in the window
    • Default: true

Menu

These options live under opts.menu and are used to control the behavior of the menu:

  • opts.menu.quick_navigation: boolean

    • When on, automatically set the cursor to the closest previous/next clickable component in the direction of cursor movement on CursorMoved
    • Default: true

  • opts.menu.entry.padding: { left: number, right: number }

    • Padding to use between the menu entry and the menu border
    • Default: { left = 1, right = 1 }

  • opts.menu.preview: boolean

    • Whether to enable previewing for menu entries
    • Default: true

  • opts.menu.keymaps: table<string, function|string|table<string, function>|table<string, string>>

    • Buffer-local keymaps in the menu
    • Use <key> = <function|string> to map a key in normal mode in the menu buffer, or use <key> = table<mode, function|string> to map a key in specific modes.
    • Default: 
      {
  ['q'] = '<C-w>q',
  ['<Esc>'] = '<C-w>q',
  ['<LeftMouse>'] = function()
    local menu = utils.menu.get_current()
    if not menu then
      return
    end
    local mouse = vim.fn.getmousepos()
    local clicked_menu = utils.menu.get({ win = mouse.winid })
    -- If clicked on a menu, invoke the corresponding click action,
    -- else close all menus and set the cursor to the clicked window
    if clicked_menu then
      clicked_menu:click_at({ mouse.line, mouse.column - 1 }, nil, 1, 'l')
      return
    end
    utils.menu.exec('close')
    utils.bar.exec('update_current_context_hl')
    if vim.api.nvim_win_is_valid(mouse.winid) then
      vim.api.nvim_set_current_win(mouse.winid)
    end
  end,
  ['<CR>'] = function()
    local menu = utils.menu.get_current()
    if not menu then
      return
    end
    local cursor = vim.api.nvim_win_get_cursor(menu.win)
    local component = menu.entries[cursor[1]]:first_clickable(cursor[2])
    if component then
      menu:click_on(component, nil, 1, 'l')
    end
  end,
  ['<MouseMove>'] = function()
    local menu = utils.menu.get_current()
    if not menu then
      return
    end
    local mouse = vim.fn.getmousepos()
    utils.menu.update_hover_hl(mouse)
    if M.opts.menu.preview then
      utils.menu.update_preview(mouse)
    end
  end,
  ['i'] = function()
    local menu = utils.menu.get_current()
    if not menu then
      return
    end
    menu:fuzzy_find_open()
  end,
},

  • opts.menu.scrollbar: table<string, boolean>

    • Scrollbar configuration for the menu.
    • Default: 
      {
  enable = true,
  -- if false, only the scrollbar thumb will be shown
  background = true
}

  • opts.menu.win_configs: table<string, dropbar_menu_win_config_opts_t>

    • Window configurations for the menu, see :h nvim_open_win()
    • Each config key in opts.menu.win_configs accepts either a plain value which will be passes directly to nvim_open_win(), or a function that takes the current menu (see dropbar_menu_t) as an argument and returns a value to be passed to nvim_open_win().
    • Default: 
      {
  border = 'none',
  style = 'minimal',
  row = function(menu)
    return menu.prev_menu
        and menu.prev_menu.clicked_at
        and menu.prev_menu.clicked_at[1] - vim.fn.line('w0')
      or 0
  end,
  ---@param menu dropbar_menu_t
  col = function(menu)
    if menu.prev_menu then
      return menu.prev_menu._win_configs.width
        + (menu.prev_menu.scrollbar and 1 or 0)
    end
    local mouse = vim.fn.getmousepos()
    local bar = require('dropbar.api').get_dropbar(
      vim.api.nvim_win_get_buf(menu.prev_win),
      menu.prev_win
    )
    if not bar then
      return mouse.wincol
    end
    local _, range = bar:get_component_at(math.max(0, mouse.wincol - 1))
    return range and range.start or mouse.wincol
  end,
  relative = 'win',
  win = function(menu)
    return menu.prev_menu and menu.prev_menu.win
      or vim.fn.getmousepos().winid
  end,
  height = function(menu)
    return math.max(
      1,
      math.min(
        #menu.entries,
        vim.go.pumheight ~= 0 and vim.go.pumheight
          or math.ceil(vim.go.lines / 4)
      )
    )
  end,
  width = function(menu)
    local min_width = vim.go.pumwidth ~= 0 and vim.go.pumwidth or 8
    if vim.tbl_isempty(menu.entries) then
      return min_width
    end
    return math.max(
      min_width,
      math.max(unpack(vim.tbl_map(function(entry)
        return entry:displaywidth()
      end, menu.entries)))
    )
  end,
  zindex = function(menu)
    if menu.prev_menu then
      if menu.prev_menu.scrollbar and menu.prev_menu.scrollbar.thumb then
        return vim.api.nvim_win_get_config(menu.prev_menu.scrollbar.thumb).zindex
      end
      return vim.api.nvim_win_get_config(menu.prev_win).zindex
    end
  end,
}

Fzf

These options live under opts.fzf and are used to control the behavior and appearance of the fuzzy finder interface.

  • opts.fzf.keymaps

    • The keymaps that will apply in insert mode, in the fzf prompt buffer
    • Same config as opts.menu.keymaps
    • Default: 
      keymaps = {
  ['<LeftMouse>'] = function()
    ---@type dropbar_menu_t
    local menu = utils.menu.get_current()
    if not menu then
      return
    end
    local mouse = vim.fn.getmousepos()
    if not mouse then
      return
    end
    if mouse.winid ~= menu.win then
      local default_func = M.opts.menu.keymaps['<LeftMouse>']
      if type(default_func) == 'function' then
        default_func()
      end
      menu:fuzzy_find_close(false)
      return
    elseif mouse.winrow > vim.api.nvim_buf_line_count(menu.buf) then
      return
    end
    vim.api.nvim_win_set_cursor(menu.win, { mouse.line, mouse.column - 1 })
    menu:fuzzy_find_click_on_entry(function(entry)
      return entry:get_component_at(mouse.column - 1, true)
    end)
  end,
  ['<MouseMove>'] = function()
    ---@type dropbar_menu_t
    local menu = utils.menu.get_current()
    if not menu then
      return
    end
    local mouse = vim.fn.getmousepos()
    if not mouse then
      return
    end
    -- If mouse is not in the menu window or on the border, end preview
    -- and clear hover highlights
    if
      mouse.winid ~= menu.win
      or mouse.line <= 0
      or mouse.column <= 0
      or mouse.winrow > #menu.entries
    then
      -- Find the root menu
      while menu and menu.prev_menu do
        menu = menu.prev_menu
      end
      if menu then
        menu:finish_preview(true)
        menu:update_hover_hl()
      end
      return
    end
    if M.opts.menu.preview then
      menu:preview_symbol_at({ mouse.line, mouse.column - 1 }, true)
    end
    menu:update_hover_hl({ mouse.line, mouse.column - 1 })
  end,
  ['<Up>'] = api.fuzzy_find_prev,
  ['<Down>'] = api.fuzzy_find_next,
  ['<C-k>'] = api.fuzzy_find_prev,
  ['<C-j>'] = api.fuzzy_find_next,
  ['<C-p>'] = api.fuzzy_find_prev,
  ['<C-n>'] = api.fuzzy_find_next,
  ['<Enter>'] = api.fuzzy_find_click,
  ['<S-Enter>'] = function()
    api.fuzzy_find_click(-1)
  end,
}

  • opts.fzf.win_configs

    • Options passed to :h nvim_open_win. The fuzzy finder will use its parent window's config by default, but options set here will override those.
    • Same config as opts.menu.win_configs
    • Default: 
      win_configs = {
  relative = 'win',
  anchor = 'NW',
  height = 1,
  win = function(menu)
    return menu.win
  end,
  width = function(menu)
    local function border_width(border)
      if type(border) == 'string' then
        if border == 'none' or border == 'shadow' then
          return 0
        end
        return 2 -- left and right border
      end

      local left, right = 1, 1
      if
        (#border == 1 and border[1] == '')
        or (#border == 4 and border[4] == '')
        or (#border == 8 and border[8] == '')
      then
        left = 0
      end
      if
        (#border == 1 and border[1] == '')
        or (#border == 4 and border[4] == '')
        or (#border == 8 and border[4] == '')
      then
        right = 0
      end
      return left + right
    end
    local menu_width = menu._win_configs.width
      + border_width(menu._win_configs.border)
    local self_width = menu._win_configs.width
    local self_border = border_width(
      (
        M.opts.fzf.win_configs
        and M.eval(M.opts.fzf.win_configs.border, menu)
      )
        or (menu.fzf_win_configs and M.eval(
          menu.fzf_win_configs.border,
          menu
        ))
        or menu._win_configs.border
    )

    if self_width + self_border > menu_width then
      return self_width - self_border
    else
      return menu_width - self_border
    end
  end,
  row = function(menu)
    local menu_border = menu._win_configs.border
    if
      type(menu_border) == 'string'
      and menu_border ~= 'shadow'
      and menu_border ~= 'none'
    then
      return menu._win_configs.height + 1
    elseif menu_border == 'none' then
      return menu._win_configs.height
    end
    local len_menu_border = #menu_border
    if
      len_menu_border == 1 and menu_border[1] ~= ''
      or (len_menu_border == 2 or len_menu_border == 4) and menu_border[2] ~= ''
      or len_menu_border == 8 and menu_border[8] ~= ''
    then
      return menu._win_configs.height + 1
    else
      return menu._win_configs.height
    end
  end,
  col = function(menu)
    local menu_border = menu._win_configs.border
    if
      type(menu_border) == 'string'
      and menu_border ~= 'shadow'
      and menu_border ~= 'none'
    then
      return -1
    end
    if
      type(menu_border) == 'table' and menu_border[#menu_border] ~= ''
    then
      return -1
    end
    return 0
  end,
},

  • opts.fzf.prompt

    • Prompt string that will be displayed in the statuscolumn of the fzf input window.
    • Can include highlight groups
    • Default: 
      prompt = '%#htmlTag# '

  • opts.fzf.char_pattern

    • Default: 
      char_pattern = '[%w%p]'

  • opts.fzf.retain_inner_spaces

    • Default: 
      retain_inner_spaces = true

  • opts.fzf.fuzzy_find_on_click

    • When opening an entry with a submenu via the fuzzy finder, open the submenu in fuzzy finder mode.
    • Default: 
      fuzzy_find_on_click = true

Sources

These options live under opts.sources and are used to control the behavior of each sources.

Path
  • opts.sources.path.relative_to: string|fun(buf: integer, win: integer): string
    • The path to use as the root of the relative path
    • If a function is provided, it will be called with the current buffer number and window id as arguments and should return a string to be used as the root of the relative path
    • Notice: currently does not support .. relative paths
    • Default: 
      function(_, win)
  -- Workaround for Vim:E5002: Cannot find window number
  local ok, cwd = pcall(vim.fn.getcwd, win)
  return ok and cwd or vim.fn.getcwd()
end
  • opts.sources.path.filter: function(name: string): boolean
    • A function that takes a file name and returns whether to include it in the results shown in the drop-down menu
    • Default: 
      function(_)
  return true
end
  • opts.sources.path.modified: function(sym: dropbar_symbol_t): dropbar_symbol_t
    • A function that takes the last symboldropbar_symbol_t in the result got from the path source and returns an alternative symboldropbar_symbol_t to show if the current buffer is modified
    • Default: 
      function(sym)
  return sym
end
    • To set a different icon, name, or highlights when the buffer is modified, you can change the corresponding fields in the returned symboldropbar_symbol_t 
      function(sym)
  return sym:merge({
    name = sym.name .. '[+]',
    icon = '',
    name_hl = 'DiffAdded',
    icon_hl = 'DiffAdded',
    -- ...
  })
end
  • opts.sources.path.preview: boolean|fun(path: string): boolean?|nil
    • A boolean or a function that takes a file path and returns whether to preview the file under cursor
    • Default: 
      function(path)
  local stat = vim.uv.fs_stat(path)
  return stat and stat.type == 'file' and stat.size <= 524288
end
Treesitter
  • opts.sources.treesitter.name_pattern: string
    • Lua pattern used to extract a short name from the node text
    • Default: '[#~%*%w%._%->!@:]+%s*' .. string.rep('[#~%*%w%._%->!@:]*', 3, '%s*')
  • opts.sources.treesitter.valid_types: string[]
    • A list of treesitter node types to include in the results
    • Default: 
      {
  'array',
  'boolean',
  'break_statement',
  'call',
  'case_statement',
  'class',
  'constant',
  'constructor',
  'continue_statement',
  'delete',
  'do_statement',
  'enum',
  'enum_member',
  'event',
  'for_statement',
  'function',
  'h1_marker',
  'h2_marker',
  'h3_marker',
  'h4_marker',
  'h5_marker',
  'h6_marker',
  'if_statement',
  'interface',
  'keyword',
  'list',
  'macro',
  'method',
  'module',
  'namespace',
  'null',
  'number',
  'operator',
  'package',
  'pair',
  'property',
  'reference',
  'repeat',
  'scope',
  'specifier',
  'string',
  'struct',
  'switch_statement',
  'type',
  'type_parameter',
  'unit',
  'value',
  'variable',
  'while_statement',
  'declaration',
  'field',
  'identifier',
  'object',
  'statement',
  'text',
}
LSP
  • opts.sources.lsp.request.ttl_init: number
    • Number of times to retry a request before giving up
    • Default: 60
  • opts.sources.lsp.request.interval: number
    • Number of milliseconds to wait between retries
    • Default: 1000
Markdown
  • opts.sources.markdown.parse.look_ahead: number
    • Number of lines to update when cursor moves out of the parsed range
    • Default: 200
Terminal

Thanks @willothy for implementing this.

  • opts.sources.terminal.icon: string or fun(buf: integer): string

    • Icon to show before terminal names
    • Default: 
      icon = function(buf)
  local icon = M.opts.icons.kinds.symbols.Terminal
  if M.opts.icons.kinds.use_devicons then
    icon = require('nvim-web-devicons').get_icon_by_filetype(
      vim.bo[buf].filetype
    ) or icon
  end
  return icon
end

  • opts.sources.terminal.name: string or fun(buf: integer): string

    • Easy to integrate with other plugins (for example, toggleterm.nvim): 
      name = function(buf)
  local name = vim.api.nvim_buf_get_name(buf)
  -- the second result val is the terminal object
  local term = select(2, require("toggleterm.terminal").indentify(name))
  if term then
    return term.display_name or term.name
  else
    return name
  end
end
    • Default: vim.api.nvim_buf_get_name

  • opts.sources.terminal.show_current: boolean

    • Show the current terminal buffer in the menu
    • Default: true

API

dropbar.nvim exposes a few functions in lua/dropbar/api.lua that can be used to interact with the winbar or the drop-down menu:

  • get_dropbar(buf: integer?, win: integer): dropbar_t? prefer utils.bar.get()
    • Get the dropbar associated with the given buffer and window
    • For more information about the dropbar_t type, see dropbar_t
  • get_current_dropbar(): dropbar_t? prefer utils.bar.get_current()
    • Get the dropbar associated with the current buffer and window
  • get_dropbar_menu(win: integer): dropbar_menu_t? prefer utils.menu.get()
    • Get the drop-down menu associated with the given window
    • For more information about the dropbar_menu_t type, see dropbar_menu_t
  • get_current_dropbr_menu(): dropbar_menu_t? prefer utils.menu.get_current()
    • Get the drop-down menu associated with the current window
  • goto_context_start(count: integer?)
    • Move the cursor to the start of the current context
    • If count is 0 or nil, go to the start of current context, or the start at previous context if cursor is already at the start of current context
    • If count is positive, goto the start of count previous context
  • select_next_context()
    • Open the menu of current context to select the next context
  • pick(idx: integer?)
    • Pick a component from current winbar
    • If idx is nil, enter interactive pick mode to select a component
    • If idx is a number, directly pick the component at that index if it exists
  • fuzzy_find_toggle(opts: table?)
    • Toggle the fuzzy finder interface for the current dropbar menu
    • Options override the default / config options for the fuzzy finder
  • fuzzy_find_click(component: number | (fun(entry: dropbar_menu_entry_t):dropbar_sumbol_t)?)
    • If component is a number, the component-nth symbol is selected, unless 0 or -1 is supplied, in which case the first or last clickable component is selected, respectively.
    • If it is a function, it receives the dropbar_menu_entry_t as an argument and should return the dropbar_symbol_t that is to be clicked.
  • fuzzy_find_navigate(direction: 'up'|'down'|integer)
    • Navigate to the nth previous/next entry while fuzzy finding
  • fuzzy_find_prev()
    • Navigate to the previous entry while fuzzy finding
  • fuzzy_find_next()
    • Navigate to the next entry while fuzzy finding

Utility Functions

Here are some utility functions that can be handy when writing your customize your config:

Bar Utility Functions

Defined in lua/dropbar/utils/bar.lua.

  • utils.bar.get(opts?): (dropbar_t?)|table<integer, dropbar_t>|table<integer, table<integer, dropbar_t>>
    • Get the dropbar(s) associated with the given buffer and window
    • If only opts.win is specified, return the dropbar attached the window;
    • If only opts.buf is specified, return all dropbars attached the buffer;
    • If both opts.win and opts.buf are specified, return the dropbar attached the window that contains the buffer;
    • If neither opts.win nor opts.buf is specified, return all dropbars in the form of table<buf, table<win, dropbar_t>>
  • utils.bar.get_current(): dropbar_t?
    • Get the dropbar associated with the current buffer and window

Menu Utility Functions

Defined in lua/dropbar/utils/menu.lua.

  • utils.menu.get(opts): (dropbar_menu_t?)|table<integer, dropbar_menu_t>
    • Get dropbar menu
    • If opts.win is specified, return the dropbar menu attached the window;
    • If opts.win is not specified, return all opened dropbar menus
  • utils.menu.get_current(): dropbar_menu_t?
    • Get current dropbar menu
  • utils.menu.select(items: any[], opts: table, on_choice: function(item, idx))
    • Opt-in replacement for vim.ui.select
    • Supports non-string items by formatting via the opts.format_item callback

Highlighting

dropbar.nvim defines the following highlight groups that, override them in your colorscheme to change the appearance of the drop-down menu, the names should be self-explanatory:

Highlight groups
Highlight group Attributes
DropBarCurrentContext { link = 'Visual' }
DropBarFzfMatch { link = 'TelescopeMatching' }
DropBarHover { link = 'Visual' }
DropBarIconCurrentContext { link = 'Visual' }
DropBarIconKindArray { link = 'Array' }
DropBarIconKindBoolean { link = 'Boolean' }
DropBarIconKindBreakStatement { link = 'Error' }
DropBarIconKindCall { link = 'Function' }
DropBarIconKindCaseStatement { link = 'Conditional' }
DropBarIconKindClass { link = 'CmpItemKindClass' }
DropBarIconKindConstant { link = 'Constant' }
DropBarIconKindConstructor { link = 'CmpItemKindConstructor' }
DropBarIconKindContinueStatement { link = 'Repeat' }
DropBarIconKindDeclaration { link = 'CmpItemKindSnippet' }
DropBarIconKindDelete { link = 'Error' }
DropBarIconKindDoStatement { link = 'Repeat' }
DropBarIconKindElseStatement { link = 'Conditional' }
DropBarIconKindEnum { link = 'CmpItemKindEnum' }
DropBarIconKindEnumMember { link = 'CmpItemKindEnumMember' }
DropBarIconKindEvent { link = 'CmpItemKindEvent' }
DropBarIconKindField { link = 'CmpItemKindField' }
DropBarIconKindFile { link = 'NormalFloat' }
DropBarIconKindFolder { link = 'Directory' }
DropBarIconKindForStatement { link = 'Repeat' }
DropBarIconKindFunction { link = 'Function' }
DropBarIconKindH1Marker { link = 'markdownH1' }
DropBarIconKindH2Marker { link = 'markdownH2' }
DropBarIconKindH3Marker { link = 'markdownH3' }
DropBarIconKindH4Marker { link = 'markdownH4' }
DropBarIconKindH5Marker { link = 'markdownH5' }
DropBarIconKindH6Marker { link = 'markdownH6' }
DropBarIconKindIdentifier { link = 'CmpItemKindVariable' }
DropBarIconKindIfStatement { link = 'Conditional' }
DropBarIconKindInterface { link = 'CmpItemKindInterface' }
DropBarIconKindKeyword { link = 'Keyword' }
DropBarIconKindList { link = 'SpecialChar' }
DropBarIconKindMacro { link = 'Macro' }
DropBarIconKindMarkdownH1 { link = 'markdownH1' }
DropBarIconKindMarkdownH2 { link = 'markdownH2' }
DropBarIconKindMarkdownH3 { link = 'markdownH3' }
DropBarIconKindMarkdownH4 { link = 'markdownH4' }
DropBarIconKindMarkdownH5 { link = 'markdownH5' }
DropBarIconKindMarkdownH6 { link = 'markdownH6' }
DropBarIconKindMethod { link = 'CmpItemKindMethod' }
DropBarIconKindModule { link = 'CmpItemKindModule' }
DropBarIconKindNamespace { link = 'NameSpace' }
DropBarIconKindNull { link = 'Constant' }
DropBarIconKindNumber { link = 'Number' }
DropBarIconKindObject { link = 'Statement' }
DropBarIconKindOperator { link = 'Operator' }
DropBarIconKindPackage { link = 'CmpItemKindModule' }
DropBarIconKindPair { link = 'String' }
DropBarIconKindProperty { link = 'CmpItemKindProperty' }
DropBarIconKindReference { link = 'CmpItemKindReference' }
DropBarIconKindRepeat { link = 'Repeat' }
DropBarIconKindScope { link = 'NameSpace' }
DropBarIconKindSpecifier { link = 'Specifier' }
DropBarIconKindStatement { link = 'Statement' }
DropBarIconKindString { link = 'String' }
DropBarIconKindStruct { link = 'CmpItemKindStruct' }
DropBarIconKindSwitchStatement { link = 'Conditional' }
DropBarIconKindTerminal { link = 'Number' }
DropBarIconKindType { link = 'CmpItemKindClass' }
DropBarIconKindTypeParameter { link = 'CmpItemKindTypeParameter' }
DropBarIconKindUnit { link = 'CmpItemKindUnit' }
DropBarIconKindValue { link = 'Number' }
DropBarIconKindVariable { link = 'CmpItemKindVariable' }
DropBarIconKindWhileStatement { link = 'Repeat' }
DropBarIconUIIndicator { link = 'SpecialChar' }
DropBarIconUIPickPivot { link = 'Error' }
DropBarIconUISeparator { link = 'SpecialChar' }
DropBarIconUISeparatorMenu { link = 'DropBarIconUISeparator' }
DropBarMenuCurrentContext { link = 'PmenuSel' }
DropBarMenuFloatBorder { link = 'FloatBorder' }
DropBarMenuHoverEntry { link = 'Visual' }
DropBarMenuHoverIcon { reverse = true }
DropBarMenuHoverSymbol { bold = true }
DropBarMenuNormalFloat { link = 'NormalFloat' }
DropBarMenuSbar { link = 'PmenuSbar' }
DropBarMenuThumb { link = 'PmenuThumb' }
DropBarPreview { link = 'Visual' }
DropBarKindArray undefined
DropBarKindBoolean undefined
DropBarKindBreakStatement undefined
DropBarKindCall undefined
DropBarKindCaseStatement undefined
DropBarKindClass undefined
DropBarKindConstant undefined
DropBarKindConstructor undefined
DropBarKindContinueStatement undefined
DropBarKindDeclaration undefined
DropBarKindDelete undefined
DropBarKindDoStatement undefined
DropBarKindElseStatement undefined
DropBarKindEnum undefined
DropBarKindEnumMember undefined
DropBarKindEvent undefined
DropBarKindField undefined
DropBarKindFile undefined
DropBarKindFolder undefined
DropBarKindForStatement undefined
DropBarKindFunction undefined
DropBarKindH1Marker undefined
DropBarKindH2Marker undefined
DropBarKindH3Marker undefined
DropBarKindH4Marker undefined
DropBarKindH5Marker undefined
DropBarKindH6Marker undefined
DropBarKindIdentifier undefined
DropBarKindIfStatement undefined
DropBarKindInterface undefined
DropBarKindKeyword undefined
DropBarKindList undefined
DropBarKindMacro undefined
DropBarKindMarkdownH1 undefined
DropBarKindMarkdownH2 undefined
DropBarKindMarkdownH3 undefined
DropBarKindMarkdownH4 undefined
DropBarKindMarkdownH5 undefined
DropBarKindMarkdownH6 undefined
DropBarKindMethod undefined
DropBarKindModule undefined
DropBarKindNamespace undefined
DropBarKindNull undefined
DropBarKindNumber undefined
DropBarKindObject undefined
DropBarKindOperator undefined
DropBarKindPackage undefined
DropBarKindProperty undefined
DropBarKindReference undefined
DropBarKindRepeat undefined
DropBarKindScope undefined
DropBarKindSpecifier undefined
DropBarKindStatement undefined
DropBarKindString undefined
DropBarKindStruct undefined
DropBarKindSwitchStatement undefined
DropBarKindTerminal undefined
DropBarKindType undefined
DropBarKindTypeParameter undefined
DropBarKindUnit undefined
DropBarKindValue undefined
DropBarKindVariable undefined
DropBarKindWhileStatement undefined

Developers

Architecture

                                              ┌──────────────────┐
                                              │winbar at win 1000│ {k}th symbol clicked
                                              │ contaning buf 1  ├──────────────────────┐
                                              └───────┬─▲────────┘                      │
                                                      ▼ │                               │
                                          _G.dropbar.get_dropbar_str()                  │
                                                      │ ▲                               │
    ┌──────────────┐                           ┌──────▼─┴──────┐                        │
    │sources       │                           │_G.dropbar.bars│                        │
    │ ┌───┐        │                           └──────┬─▲──────┘                        │
    │ │lsp│        │                       ┌───────┬──▼─┴──┬───────┐                    │
    │ └───┘        │                     ┌─▼─┐   ┌─┴─┐   ┌─┴─┐    ...                   │
    │ ┌──────────┐ │                     │[1]│   │[2]│   │[3]│                          │
    │ │treesitter│ │                     └─┬─┘   └─┬─┘   └─┬─┘                          │
    │ └──────────┘ │                       │      ...     ...                           │
    │  ...         │                       └──┬─▲─────────────┬──────┐                  │
    └─────┬─▲──────┘                        ┌─▼─┴──┐       ┌──┴───┐ ...                 │
          │ │                               │[1000]│       │[1015]│                     │
          │ │                               └─┬─▲──┘       └──────┘                     │
          │ │                    __tostring() │ │ return string cache                   │
          │ │                             ┌───▼─┴───┐                    ┌──────────────▼──────────────┐
          │ │                             │dropbar_t├────────────────────▶     _G.dropbar.callbacks    │
          │ │    On update events         └───┬─▲───┘  register symbol   └──────────────┬──────────────┘
          │ │ get_symbols(1, 1000, <cursor>)  │ │    on_click() callbacks               │
          │ └─────────────────────────────────┘ │                       ┌──────────┬────▼─────┬─────────┐
          └─────────────────────────────────────┘                   ┌───▼────┐ ┌───┴────┐ ┌───┴────┐   ...
      each source returns dropbar_symbol_t[]                        │['buf1']│ │['buf2']│ │['buf3']│
     dropbar_t adds symbols as its components                       └───┬────┘ └───┬────┘ └───┬────┘
          dropbar_t flushes string cache                                │         ...        ...
                                                                        └────────┬───────────────┬─────────┐
                                                                           ┌─────▼─────┐   ┌─────┴─────┐  ...
                                                                           │['win1000']│   │['win1015']│
                                                                           └─────┬─────┘   └─────┬─────┘
                                                                                 │              ...
                                                                  ┌─────────┬────▼────┬─────────┐
                                                              ┌───┴───┐    ...   ┌────┴────┐   ...
                                                              │['fn1']│          │['fn{k}']│
                                                              └───────┘          └────┬────┘
                                                                                      ▼
                                                      invoke _G.dropbar.bars[1][1000].components[k]:on_click()
                                                                                      │
                                                                                      ▼
                                                                     open drop-down menu, goto symbol, etc

Classes

dropbar_t

Declared and defined in lua/dropbar/bar.lua.

dropbar_t is a class that represents a winbar.

It gets symbolsdropbar_symbol_t[] from sourcesdropbar_source_t and renders them to a string. It is also responsible for registering on_click callbacks of each symbol in the global table _G.dropbar.callbacks so that nvim knows which function to call when a symbol is clicked.

dropbar_t has the following fields:

Field Type Description
buf integer the buffer the dropbar is attached to
win integer the window the dropbar is attached to
sources dropbar_source_t[] sourcesdropbar_source_t[] that provide symbols to the dropbar
separator dropbar_symbol_t separatordropbar_symbol_t between symbols
padding {left: integer, right: integer} padding to use between the winbar and the window border
extends dropbar_symbol_t symboldropbar_symbol_t to use when a symbol is truncated
components dropbar_symbol_t[] symbolsdropbar_symbol_t[] to render
string_cache string string cache of the dropbar
in_pick_mode boolean? whether the dropbar is in pick mode
symbol_on_hover dropbar_symbol_t The previous symboldropbar_symbol_t[] under mouse hovering in the dropbar
last_update_request_time float? timestamp of the last update request in ms, see :h uv.now()

dropbar_t has the following methods:

Method Description
dropbar_t:new(opts: dropbar_opts_t): dropbar_t constructor of dropbar_t
dropbar_t:del() destructor of dropbar_t
dropbar_t:displaywidth(): integer returns the display width of the dropbar
dropbar_t:truncate() truncates the dropbar if it exceeds the display width
*side effect: changes dropbar componentsdropbar_symbol_t[]
dropbar_t:cat(plain: boolean?): string concatenates the dropbar components into a string with substrings for highlights and click support if plain is not set; else returns a plain string without substrings for highlights and click support
dropbar_t:redraw() redraws the dropbar
dropbar_t:update() update dropbar componentsdropbar_symbol_t[] and redraw the dropbar afterwards
dropbar_t:pick_mode_wrap(fn: fun(...): T?, ...): T? executes fn with parameters ... in pick mode
dropbar_t:pick(idx: integer?) pick a component from dropbar in interactive pick mode if idx is not given; else pick the idxth component directly
dropbar_t:update_current_context_hl(bar_idx: integer) Update the current context highlight hl-DropBarCurrentContext and hl-DropBarIconCurrentContext assuming the bar_idx th symbol is clicked in the winbar
dropbar_t:update_hover_hl(col: integer?) Highlight the symbol at col as if the mouse is hovering on it
dropbar_t:__tostring(): string meta method to convert dropbar_t to its string representation

dropbar_symbol_t

Declared and defined in lua/dropbar/bar.lua.

dropbar_symbol_t is a class that represents a symbol in a dropbar. It is the basic element of dropbar_t and dropbar_menu_entry_t.

dropbar_symbol_t has the following fields:

Field Type Description
name string name of the symbol
icon string icon of the symbol
name_hl string? highlight of the name of the symbol
icon_hl string? highlight of the icon of the symbol
win integer? the source window the symbol is shown in
buf integer? the source buffer the symbol is defined in
view table? The original view of the source window, created by winsaveview(), used to restore the view after previewing the symbol
bar dropbar_t? the dropbardropbar_t the symbol belongs to, if the symbol is shown inside a winbar
menu dropbar_menu_t? menudropbar_menu_t associated with the symbol, if the symbol is shown inside a winbar
entry dropbar_menu_entry_t? the dropbar menu entrydropbar_menu_entry_t the symbol belongs to, if the symbol is shown inside a menu
children dropbar_symbol_t[]? children of the symbol (e.g. a children of a function symbol can be local variables inside the function)
siblings dropbar_symbol_t[]? siblings of the symbol (e.g. a sibling of a symbol that represents a level 4 markdown heading can be other headings with level 4)
bar_idx integer? index of the symbol in the dropbardropbar_t
entry_idx integer? index of the symbol in the menu entrydropbar_menu_entry_t
sibling_idx integer? index of the symbol in the siblings
range {start: {line: integer, character: integer}, end: {line: integer, character: integer}} range of the symbol in the source window
on_click fun(this: dropbar_symbol_t, min_width: integer?, n_clicks: integer?, button: string?, modifiers: string?)|false? callback to invoke when the symbol is clicked, force disable on_click when the value if set to false
callback_idx integer? idx of the on_click callback in _G.dropbar.callbacks[buf][win], use this to index callback function because bar_idx could change after truncate
opts dropbar_symbol_opts_t? options passed to winbar_symbol_t:new() when the symbols is created
data table? any extra data associated with the symbol

dropbar_symbol_t has the following methods:

Method Description
dropbar_symbol_t:new(opts: dropbar_symbol_t?): dropbar_symbol_t constructor of dropbar_symbol_t
dropbar_symbol_t:del() destructor of dropbar_symbol_t
dropbar_symbol_t:merge(opts: dropbar_symbol_t) create a new dropbar_symbol_t by merging opts into the current dropbar_symbol_t
dropbar_symbol_t:cat(plain: boolean?): string concatenates the symbol into a string with substrings for highlights and click support if plain is not set; else returns a plain string without substrings for highlights and click support
dropbar_symbol_t:displaywidth(): integer returns the display width of the symbol
dropbar_symbol_t:bytewidth(): integer returns the byte width of the symbol
dropbar_symbol_t:jump() jump to the start of the range of the dropbar symbol
dropbar_symbol_t:preview(orig_view: table?) preview the symbol in the source window, use orig_view as the original view of the source window (to restore win view after preview ends)
dropbar_symbol_t:preview_restore_hl() clear the preview highlights in the source window
dropbar_symbol_t:preview_restore_view() restore the view in the source window after previewing the symbol
dropbar_symbol_t:swap_field(field: string, new_val: any) temporarily change the content of a dropbar symbol
dropbar_symbol_t:restore() restore the original value of the fields of a dropbar symbol changed in dropbar_symbol_t:swap_field()

dropbar_menu_t

Declared and defined in lua/dropbar/menu.lua.

dropbar_menu_t is a class that represents a drop-down menu.

dropbar_menu_t has the following fields:

Field Type Description
buf integer buffer number of the menu
win integer window id of the menu
is_opened boolean? whether the menu is currently opened
entries dropbar_menu_entry_t[] entries in the menu
win_configs table window configuration, value can be a function, see menu configuration options
_win_configs table? evaluated window configuration
cursor integer[]? initial cursor position
prev_win integer? previous window, assigned when calling new() or automatically determined in open()
prev_buf integer? previous buffer, assigned when calling new() or automatically determined in open()
sub_menu dropbar_menu_t? submenu, assigned when calling new() or automatically determined when a new menu opens
prev_menu dropbar_menu_t? previous menu, assigned when calling new() or automatically determined in open()
clicked_at integer[]? last position where the menu was clicked, 1,0-indexed
prev_cursor integer[]? previous cursor position in the menu
symbol_previewed dropbar_symbol_t? symbol begin previewed in the menu

dropbar_menu_t has the following methods:

Method Description
dropbar_menu_t:new(opts: dropbar_menu_t?): dropbar_menu_t constructor of dropbar_menu_t
dropbar_menu_t:del() destructor of dropbar_menu_t
dropbar_menu_t:eval_win_configs() evaluate window configurations dropbar_menu_t.win_configs and store the result in dropbar_menu_t._win_configs
dropbar_menu_t:get_component_at(pos: integer[], look_ahead: boolean?): dropbar_symbol_t?, { start: integer, end: integer }? get the componentdropbar_symbol_t at position pos and its range it occupies in the entry it belongs to
dropbar_menu_t:click_at(pos: integer[], min_width: integer?, n_clicks: integer?, button: string?, modifiers: string?) simulate a click at pos in the menu
dropbar_menu_t:click_on(symbol: dropbar_symbol_t, min_width: integer?, n_clicks: integer?, button: string?, modifiers: string?) simulate a click at the component symboldropbar_symbol_t of the menu
dropbar_menu_t:update_hover_hl(pos: integer[]) update the hover highlights (DropBarMenuHover*) assuming the cursor/mouse is hovering at pos in the menu
dropbar_menu_t:update_current_context_hl(linenr: integer?) update the current context highlight (hl-DropBarMenuCurrentContext) assuming the cursor is at line linenr in the menu
dropbar_menu_t:make_buf() create the menu buffer from the entriesdropbar_menu_entry_t, must be called after self:eval_win_configs()
dropbar_menu_t:make_win() open the menu window with self._win_configs and set menu options, must be called after self:make_buf()
dropbar_menu_t:override(opts: dropbar_menu_t?) override menu options
dropbar_menu_t:preview_symbol_at(pos: integer[], look_ahead: boolean?) preview the componentdropbar_symbol_t at position pos in the menu
dropbar_menu_t:finish_preview(restore_view: boolean?) finish previewing the symbol, always clear the preview highlights in the source buffer, restore the original view of the source window if restore_view is true or nil
dropbar_menu_t:quick_navigation(new_cursor: integer[]) nagivate the cursor to the neartest clickable component on the current menu entry in the direction of cursor movement
dropbar_menu_t:open(opts: dropbar_menu_t?) open the menu with options opts
dropbar_menu_t:close(restore_view: boolean?) close the menu
dropbar_menu_t:toggle(opts: dropbar_menu_t?) toggle the menu
dropbar_menu_t:fuzzy_find_restore_entries() restore menu buffer and entries in their original order before modified by fuzzy search
dropbar_menu_t:fuzzy_find_close() stop fuzzy finding and clean up allocated memory
dropbar_menu_t:fuzzy_find_click_on_entry(component: number|fun(dropbar_menu_entry_t):dropbar_symbol_t) click on the currently selected fuzzy menu entry, choosing the component to click according to component
dropbar_menu_t:fuzzy_find_open(opts: table?) open the fuzzy search menu, overriding fzf configuration with opts argument
dropbar_menu_t:fuzzy_find_navigate(direction: 'up'|'down'|integer) navigate to the nth previous/next entry while fuzzy finding

dropbar_menu_entry_t

Declared and defined in lua/dropbar/menu.lua.

dropbar_menu_entry_t is a class that represents an entry (row) in a drop-down menu. A dropbar_menu_t instance is made up of multiple dropbar_menu_entry_t instances while a dropbar_menu_entry_t instance can contain multiple dropbar_symbol_t instances.

dropbar_menu_entry_t has the following fields:

Field Type Description
separator dropbar_symbol_t separator to use in the entry
padding {left: integer, right: integer} padding to use between the menu entry and the menu border
components dropbar_symbol_t[] componentsdropbar_symbol_t[] in the entry
virt_text string[][]? list of virtual text chunks to display below the entry
menu dropbar_menu_t? the menu the entry belongs to
idx integer? the index of the entry in the menu

dropbar_menu_entry_t has the following methods:

Method Description
dropbar_menu_entry_t:new(opts: dropbar_menu_entry_t?): dropbar_menu_entry_t constructor of dropbar_menu_entry_t
dropbar_menu_entry_t:del() destructor of dropbar_menu_entry_t
dropbar_menu_entry_t:cat(): string, dropbar_menu_hl_info_t concatenate the components into a string, returns the string and highlight infodropbar_menu_hl_info_t
dropbar_menu_entry_t:displaywidth(): integer calculate the display width of the entry
dropbar_menu_entry_t:bytewidth(): integer calculate the byte width of the entry
dropbar_menu_entry_t:first_clickable(offset: integer?): dropbar_symbol_t?, { start: integer, end: integer }? get the first clickable componentdropbar_symbol_t and its range in the dropbar menu entry starting from offset, which defaults to 0
dropbar_menu_entry_t:get_component_at(col: integer, look_ahead: boolean?): dropbar_symbol_t?, { start: integer, end: integer }? get the componentdropbar_symbol_t at column position col and the range it occupies in the menu entry
dropbar_menu_entry_t:prev_clickable(col: integer): dropbar_symbol_t?, { start: integer, end: integer }? get the previous clickable componentdropbar_symbol_t and its range in the dropbar menu entry given current column position col
dropbar_menu_entry_t:next_clickable(col: integer): dropbar_symbol_t?, { start: integer, end: integer }? get the next clickable componentdropbar_symbol_t and its range in the dropbar menu entry given current column position col

dropbar_menu_hl_info_t

Declared and defined in lua/dropbar/menu.lua.

dropbar_menu_hl_info_t is a class that represents a highlight range in a single line of a drop-down menu.

dropbar_menu_hl_info_t has the following fields:

Field Type Description
start integer start column of the higlighted range
end integer end column of the higlighted range
hlgroup string highlight group to use for the range
ns integer? namespace to use for the range, nil if using default namespace

dropbar_source_t

Declared in lua/dropbar/sources/init.lua.

dropbar_source_t is a class that represents a source of a drop-down menu.

dropbar_source_t has the following field:

Field Type Description
get_symbols function(buf: integer, win: integer, cursor: integer[]): dropbar_symbol_t[] returns the symbolsdropbar_symbol_t[] to show in the winbar given buffer number buf and cursor position cursor

dropbar_select_opts_t

Declared in lua/dropbar/utils/menu.lua.

dropbar_select_opts_t is a class that represents the options passed to utils.menu.select (vim.ui.select with some extensions).

dropbar_select_opts_t has the following fields:

Field Type Description
prompt string? determines what will be shown at the top of the select menu.
format_item fun(item: any): string, string[][]? formats the list items for display in the menu, and optionally formats virtual text chunks to be shown below the item.
preview fun(self: dropbar_symbol_t, item: any, idx: integer) previews the list item under the cursor.
preview_close fun(self: dropbar_symbol_t, item: any, idx: integer) closes the preview when the menu is closed.

Making a New Source

A dropbar_source_t instance is just a table with get_symbols field set to a function that returns an array of dropbar_symbol_t instances given the buffer number, the window id, and the cursor position.

We have seen a simple example of a custom source in the default config of opts.bar.sources where the second source is set to a combination of lsp/treesitter/markdown sources using the utils.source.fallback() factory function, which simply returns a table containing a get_symbols() function where each source passed to utils.source.fallback() is queried and the first non-empty result get from the sources is returned as the result of the combined source.

Here is another example of a custom source that will always return two symbols saying 'Hello' and 'dropbar' with highlights 'hl-Keyword' and 'hl-Title' and a smiling face shown in 'hl-WarningMsg' at the start of the first symbol; clicking on the first symbol will show a notification message saying 'Have you smiled today?', followed by the smiling face icon used in the in dropbar symbol:

local bar = require('dropbar.bar')
local custom_source = {
  get_symbols = function(_, _, _)
    return {
      bar.dropbar_symbol_t:new({
        icon = '',
        icon_hl = 'WarningMsg',
        name = 'Hello',
        name_hl = 'Keyword',
        on_click = function(self)
          vim.notify('Have you smiled today? ' .. self.icon)
        end,
      }),
      bar.dropbar_symbol_t:new({
        name = 'dropbar',
        name_hl = 'Title',
      }),
    }
  end,
}

Add this source to opts.bar.sources table to see it in action:

require('dropbar').setup({
  bar = {
    sources = {
      custom_source,
    },
  },
})

Making a Source With Drop-Down Menus

The following example shows how to make a source that returns two symbols with the first symbol having a drop-down menu with a single entry saying 'World':

local bar = require('dropbar.bar')
local menu = require('dropbar.menu')
local custom_source = {
  get_symbols = function(_, _, _)
    return {
      bar.dropbar_symbol_t:new({
        icon = '',
        icon_hl = 'WarningMsg',
        name = 'Hello',
        name_hl = 'Keyword',
        on_click = function(self)
          self.menu = menu.dropbar_menu_t:new({
            entries = {
              menu.dropbar_menu_entry_t:new({
                components = {
                  bar.dropbar_symbol_t:new({
                    icon = '',
                    icon_hl = 'WarningMsg',
                    name = 'World',
                    name_hl = 'Keyword',
                    on_click = function(sym)
                      vim.notify('Have you smiled today? ' .. sym.icon)
                    end,
                  }),
                },
              }),
            },
          })
          self.menu:toggle()
        end,
      }),
      bar.dropbar_symbol_t:new({
        name = 'dropbar',
        icon = '',
        name_hl = 'Special',
        icon_hl = 'Error',
      }),
    }
  end,
}

Default on_click() Callback

dropbar_symbol_t:new() defines a default on_click() callback if non is provided.

The default on_click() callback will look for these fields in the symbol instance and create a drop-down menu accordingly on click, for more information about these fields see dropbar_symbol_t.

For creating the drop-down menu:

  • dropbar_symbol_t.siblings
  • dropbar_symbol_t.sibling_idx
  • dropbar_symbol_t.children

For jumping to the symbol or previewing it:

  • dropbar_symbol_t.range
  • dropbar_symbol_t.win
  • dropbar_symbol_t.buf

The following example shows a source that utilizes the default on_click() callback:

local bar = require('dropbar.bar')
local custom_source = {
  get_symbols = function(buf, win, _)
    return {
      bar.dropbar_symbol_t:new({
        name = 'Section 1',
        name_hl = 'Keyword',
        siblings = {
          bar.dropbar_symbol_t:new({
            name = 'Section 2',
            name_hl = 'WarningMsg',
          }),
          bar.dropbar_symbol_t:new({
            name = 'Section 3',
            name_hl = 'Error',
          }),
          bar.dropbar_symbol_t:new({
            name = 'Section 4',
            name_hl = 'String',
            children = {
              bar.dropbar_symbol_t:new({
                buf = buf,
                win = win,
                name = 'Section 4.1',
                name_hl = 'String',
                -- Will jump to line 3, col 4 (0-indexed) when clicked in the
                -- menu
                range = {
                  start = { line = 3, character = 4 },
                  ['end'] = { line = 5, character = 6 },
                }
              }),
            },
          }),
        },
      }),
    }
  end,
}

To see this source in action add it to opts.bar.sources table:

require('dropbar').setup({
  bar = {
    sources = {
      custom_source,
    },
  },
})

Lazy-Loading Expensive Fields

If the symbol fields siblings or children are expensive to compute, you can use meta-tables to lazy-load them, so that they are only computed when a menu is opened:

local bar = require('dropbar.bar')
local custom_source = {
  get_symbols = function(_, _, _)
    return {
      bar.dropbar_symbol_t:new(setmetatable({
        name = 'Section 1',
        name_hl = 'Keyword',
      }, {
        __index = function(self, key)
          if key == 'siblings' then
            self[siblings] = -- [[ compute siblings ]]
            return self[siblings]
          end
          if key == 'children' then
            self[children] = -- [[ compute children ]]
            return self[children]
          end
          -- ...
        end,
      })),
    }
  end,
}

To see concrete examples of lazy-loading see lua/dropbar/sources.

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