nvim: fancy ruler with diagnostics

home/common/nvim/default.nix

@@ -10,6 +10,7 @@
     withRuby      = false;
 
     extraLuaConfig = lib.fileContents ./init.lua;
+
     extraPackages = with pkgs; [
       black
       cue

home/common/nvim/init.lua

@@ -8,18 +8,32 @@ vim.opt.laststatus = 0
 vim.opt.number = true
 vim.opt.relativenumber = true
 vim.opt.ruler = true
-vim.opt.rulerformat = "" -- FIXME: fancify!
-vim.opt.rulerformat = "%36(%5l,%-6(%c%V%) %t%)%*"
 vim.opt.syntax = "on"
 vim.opt.termguicolors = true
 
+-- Ruler
+function GetIndicators()
+  local bufnr = vim.api.nvim_get_current_buf()
+	local counts = vim.diagnostic.count(bufnr)
+	local errors = counts[vim.diagnostic.severity.ERROR] or 0
+	local warnings = counts[vim.diagnostic.severity.WARN] or 0
+	local warn_string = warnings > 0 and "%#DiagnosticWarn# " .. warnings .. " " or "  "
+	local error_string = errors > 0 and "%#DiagnosticError# " .. errors .. " " or "  "
+	return warn_string .. error_string
+end
+function GetRulerIcon()
+	local icon = vim.bo.modified and "" or ""
+	return "%#CustomRulerSeparator#%#CustomRulerIcon#" .. icon .. " "
+end
+vim.opt.rulerformat = "%40(%=%{%v:lua.GetIndicators()%}%#Label#│ %t %)"
+
 -- Search
 vim.opt.ignorecase = true
 vim.opt.smartcase = true
 
 -- Tab completion
 -- vim.opt.wildmode="list:longest,full"
-vim.opt.wildignore="*.swp,*.o,*.so,*.exe,*.dll"
+vim.opt.wildignore = '*.swp,*.o,*.so,*.exe,*.dll'
 
 -- Whitespaces
 vim.opt.breakindent = true
@@ -32,14 +46,14 @@ vim.opt.smartindent = true
 vim.opt.tabstop = 2
 vim.opt.wrap = false
 vim.opt.list = true
-vim.opt.listchars="tab:»·,trail:·"
+im.opt.listchars = "tab:»·,trail:·"
 
 -- Folds
 vim.opt.foldenable = false
 vim.opt.foldtext = "v:lua.vim.treesitter.foldtext()"
 vim.opt.foldmethod = "expr"
 vim.opt.foldexpr = "nvim_treesitter#foldexpr()"
-
+qqq
 --
 
 vim.o.autochdir = true
@@ -61,29 +75,29 @@ vim.o.grepprg = [[rg --glob "!.jj" --glob "!.git" --no-heading --vimgrep --follo
 vim.opt.grepformat = vim.opt.grepformat ^ { "%f:%l:%c:%m" }
 
 vim.fn.sign_define(
-	"DiagnosticSignError",
-	{ text = "", hl = "DiagnosticSignError", texthl = "DiagnosticSignError", culhl = "DiagnosticSignErrorLine" }
+  "DiagnosticSignError",
+  { text = "", hl = "DiagnosticSignError", texthl = "DiagnosticSignError", culhl = "DiagnosticSignErrorLine" }
 )
 vim.fn.sign_define(
-	"DiagnosticSignWarn",
-	{ text = "", hl = "DiagnosticSignWarn", texthl = "DiagnosticSignWarn", culhl = "DiagnosticSignWarnLine" }
+  "DiagnosticSignWarn",
+  { text = "", hl = "DiagnosticSignWarn", texthl = "DiagnosticSignWarn", culhl = "DiagnosticSignWarnLine" }
 )
 vim.fn.sign_define(
-	"DiagnosticSignInfo",
-	{ text = "", hl = "DiagnosticSignInfo", texthl = "DiagnosticSignInfo", culhl = "DiagnosticSignInfoLine" }
+  "DiagnosticSignInfo",
+  { text = "", hl = "DiagnosticSignInfo", texthl = "DiagnosticSignInfo", culhl = "DiagnosticSignInfoLine" }
 )
 vim.fn.sign_define(
-	"DiagnosticSignHint",
-	{ text = "", hl = "DiagnosticSignHint", texthl = "DiagnosticSignHint", culhl = "DiagnosticSignHintLine" }
+  "DiagnosticSignHint",
+  { text = "", hl = "DiagnosticSignHint", texthl = "DiagnosticSignHint", culhl = "DiagnosticSignHintLine" }
 )
 
 -- Make <Tab> work for snippets
 vim.keymap.set({ "i", "s" }, "<Tab>", function()
-	if vim.snippet.active({ direction = 1 }) then
-		return "<cmd>lua vim.snippet.jump(1)<cr>"
-	else
-		return "<Tab>"
-	end
+  if vim.snippet.active({ direction = 1 }) then
+    return "<cmd>lua vim.snippet.jump(1)<cr>"
+  else
+    return "<Tab>"
+  end
 end, { expr = true })
 
 vim.keymap.set({ "n" }, "<c-/>", "gcc", { remap = true })