Humble beginning...

config/nvim/lua/fschauen/init.lua

@@ -228,6 +228,8 @@ M.setup = function()
   if vim.v.errmsg ~= '' then
     vim.notify(('Colorscheme %s not found!'):format(colorscheme), vim.log.levels.WARN)
   end
+
+  require('testline').setup()
 end
 
 return M

config/nvim/lua/testline.lua

@@ -0,0 +1,169 @@
+local M = {}
+
+local object = (function()
+  local obj = {}
+  obj.__index = obj
+
+  function obj:init(...) end
+
+  function obj:new(...)
+    local new = setmetatable({}, self)
+    new:init(...)
+    return new
+  end
+
+  function obj:extend()
+    local cls = {}
+    cls.__index = cls
+    cls.super = self
+    return setmetatable(cls, self)
+  end
+
+  return obj
+end)()
+
+local segment = (function()
+  local segment = object:extend()
+
+  function segment:init(opts)
+    self.opts = opts or {}
+  end
+
+  function segment:render()
+    return self.opts
+  end
+
+  function segment.make(f)
+    local new = segment:extend()
+    function new:render(...) return f(...) end
+    return new
+  end
+
+  return segment
+end)()
+
+local mode = (function()
+  local mode = segment:extend()
+
+  mode.map = {
+    ['n']  = '', -- 'Normal ', -- Normal
+    ['no'] = '', -- 'O-Pend ', -- Operator-pending
+    ['ni'] = '', -- 'Normal ', -- Normal via i_CTRL-O
+    ['v']  = '󰒉', -- 'Visual ', -- Visual by character
+    [''] = '󰩭', -- 'V-Block', -- Visual blockwise
+    ['s']  = '󰒉', -- 'Select ', -- Select by character
+    [''] = '󰩭', -- 'S-Block', -- Select blockwise
+    ['i']  = '', -- 'Insert ', -- Insert
+    ['r']  = '󰄾', -- 'Replace', -- Replace
+    ['rv'] = '󰶻', -- 'V-Repl ', -- Virtual Replace
+    ['c']  = '', -- 'Command', -- Command-line
+    ['cv'] = '', -- '  Ex   ', -- Ex mode
+    ['rm'] = '', -- ' modeore  ', -- -- modeORE --
+    ['r?'] = '󰭚', -- 'Confirm', -- :confirm
+    ['!']  = '', -- ' Shell ', -- External command executing
+    ['t']  = '', -- ' Term  ', -- Terminal
+  }
+
+  function mode:render()
+    -- if not is_focused then return ' 󰒲 ' end -- TODO: handle inactive windows
+    local code = vim.api.nvim_get_mode().mode:lower()
+    local symbol = mode.map[code:sub(1, 2)] or mode.map[code:sub(1, 1)] or code
+    return ' ' .. symbol .. ' '
+  end
+
+  return mode
+end)()
+
+-- FIX: actually find the branch
+local branch = segment.make(function() return '󰘬 main' end)
+
+local filename = segment.make(function() return vim.fn.expand('%:~:.') end)
+
+local modified = segment.make(function() return vim.bo.modified and '' or '' end)
+
+local readonly = segment.make(function() return (vim.bo.readonly or not vim.bo.modifiable) and '󰏯' or '' end)
+
+local searchcount = segment.make(function()
+  if vim.v.hlsearch == 1 then
+    local count = vim.fn.searchcount { maxcount = 999, timeout = 250 }
+    if count.total > 1 then
+      return (' %d/%s'):format(
+        count.current,
+        count.total > count.maxcount and '' or ('%d'):format(count.total))
+    end
+  end
+  return ''
+end)
+
+-- TODO: handle inactive windows
+-- TODO: add icons
+local filetype = segment.make(function() return vim.bo.filetype end)
+
+local fileformat = segment.make(function()
+  local icons = { unix = '', dos = '', mac = '' }
+  return icons[vim.bo.fileformat] or vim.bo.fileformat
+end)
+
+local progress = segment.make(function()
+  local line, total = vim.fn.line('.'), vim.fn.line('$')
+  return
+    line == 1 and ' 󰘣 ' or
+    line == total and ' 󰘡 ' or
+    ('%2d%%%%'):format(math.floor(100 * line / total))
+end)
+
+local location = segment.make(function() return ('%3d:%-2d'):format(vim.fn.line('.'), vim.fn.virtcol('.')) end)
+
+local whitespace = segment.make(function()
+  local trailing = [[\s\+$]]
+  local line = vim.fn.search(trailing, 'nwc')
+  if line == 0 then
+    return ''
+  else
+    local result = (' %d'):format(line)
+    local total = vim.fn.searchcount({ pattern = trailing }).total
+    return result .. (total > 1 and (' (%d total)'):format(total) or '')
+  end
+end)
+
+local literal = function(s) return segment.make(function() return s end) end
+
+local defaults = {
+  -- TODO: paste
+  mode,
+  branch,
+  modified,
+  readonly,
+  filename,
+  literal '%=',
+  searchcount,
+  literal '%=',
+  -- TODO: diagnostics
+  filetype,
+  fileformat,
+  progress,
+  location,
+  whitespace,
+}
+
+M.render = function()
+  local rendered = vim.tbl_map(function(comp) return comp:render() end, defaults)
+  local non_empty = vim.tbl_filter(function(item) return #item > 0 end, rendered)
+  return vim.fn.join(non_empty, ' ')
+end
+
+M.setup = function()
+  local colors = require('gruvbox').colors()
+  vim.api.nvim_set_hl(0, 'StatusLine', { fg = colors.fg2, bg = colors.bg1 })
+
+  -- vim.api.nvim_set_hl(0, 'TestlineNormal',  { fg = colors.bg0, bg = colors.blue })
+  -- vim.api.nvim_set_hl(0, 'TestlineInsert',  { fg = colors.bg0, bg = colors.green })
+  -- vim.api.nvim_set_hl(0, 'TestlineVisual',  { fg = colors.bg0, bg = colors.purple })
+  -- vim.api.nvim_set_hl(0, 'TestlineReplace', { fg = colors.bg0, bg = colors.red })
+  -- vim.api.nvim_set_hl(0, 'TestlineCommand', { fg = colors.bg0, bg = colors.yellow })
+
+  vim.opt.statusline=[[%{%v:lua.require('testline').render()%}]]
+end
+
+return M
+