nvim: refactor creation of custom indicators for lualine

config/nvim/lua/fschauen/plugins/lualine.lua

@@ -4,7 +4,9 @@ return {
   dependencies = "nvim-tree/nvim-web-devicons",
 
   opts = function()
+    local icons = require("fschauen.util.icons")
     local dynamic_color = require("fschauen.util.lualine").dynamic_color
+    local indicator = require("fschauen.util.lualine").indicator
     local window = require("fschauen.util.window")
     local orange = "#d65d0e"
 
@@ -12,24 +14,59 @@ return {
       return vim.diagnostic.is_enabled { bufnr = bufnr or 0 }
     end
 
-    local autoformat = require("fschauen.util.autoformat").lualine()
+    --
+    -- Components
+    --
+
+    local autoformat = indicator {
+      icon = icons.ui.Format,
+      cond = require("fschauen.util.autoformat").is_enabled,
+    }
     local branch = {
       "branch",
-      icon = require("fschauen.util.icons").git.Branch,
+      icon = icons.git.Branch,
+      cond = window.is_medium,
+    }
+    local diagnostics = {
+      dynamic_color("diagnostics"),
+      cond = is_diagnostics_enabled,
+    }
+    local diag_status = indicator {
+      icon = icons.ui.Diagnostic,
+      cond = is_diagnostics_enabled,
+    }
+    local fileformat = {
+      "fileformat",
       cond = window.is_medium,
     }
-    local diagnostics = { dynamic_color("diagnostics"), cond = is_diagnostics_enabled }
-    local diag_status = { function() return "" end, cond = is_diagnostics_enabled }
-    local fileformat = { "fileformat", cond = window.is_medium }
     local filename = "fschauen.filename"
-    local filetype = { dynamic_color("filetype"), cond = window.is_medium }
+    local filetype = {
+      dynamic_color("filetype"),
+      cond = window.is_medium,
+    }
     local mode = "fschauen.mode"
     local searchcount = "fschauen.searchcount"
-    local spell = "fschauen.spell"
+    local spell = indicator {
-    local status =
+      icon = icons.ui.SpellCheck,
-      { dynamic_color("fschauen.status"), color = { fg = orange }, padding = 0 }
+      cond = function() return vim.o.spell end,
-    local whitespace = { dynamic_color("fschauen.whitespace"), cond = window.is_wide }
+    }
-    local wrap = "fschauen.wrap"
+    local status = {
+      dynamic_color("fschauen.status"),
+      color = { fg = orange },
+      padding = 0,
+    }
+    local whitespace = {
+      dynamic_color("fschauen.whitespace"),
+      cond = window.is_wide,
+    }
+    local wrap = indicator {
+      icon = icons.ui.TextWrap,
+      cond = function() return vim.o.wrap end,
+    }
+
+    --
+    -- Sections
+    --
 
     local sections = {
       lualine_a = { mode },

config/nvim/lua/fschauen/util/autoformat.lua

@@ -4,18 +4,18 @@ M._augroup = nil
 
 ---Whether autoformatting is enabled.
 ---@return boolean
-local is_enabled = function() return M._augroup ~= nil end
+M.is_enabled = function() return M._augroup ~= nil end
 
 ---Disable autoformatting.
 M.disable = function()
-  if not is_enabled() then return end
+  if not M.is_enabled() then return end
   vim.api.nvim_del_augroup_by_id(M._augroup)
   M._augroup = nil
 end
 
 ---Enable autoformatting.
 M.enable = function()
-  if is_enabled() then return end
+  if M.is_enabled() then return end
 
   local ok, formatter = pcall(require, "formatter.format")
   if not ok then
@@ -34,21 +34,11 @@ end
 
 ---Toggle autoformatting.
 M.toggle = function()
-  if is_enabled() then
+  if M.is_enabled() then
     M.disable()
   else
     M.enable()
   end
 end
 
----Create a lualine component that shows an icon when autoformatting is enabled.
----@return table component
-M.lualine = function()
-  local icon = require("fschauen.util.icons").ui.Format
-  return {
-    function() return icon end,
-    cond = is_enabled,
-  }
-end
-
 return M

config/nvim/lua/fschauen/util/icons.lua

@@ -119,9 +119,11 @@ M.ui = {
   ReadOnly              = "",    -- "RO",
   Search                = "",    -- 
   Sleep                 = "󰒲",
+  SpellCheck            = "󰓆",
   Telescope             = "",
   TestTube              = "󰙨",    -- 󰤑
   Text                  = "󰬴",
+  TextWrap              = "󰖶",
   Toggle                = "󰨚",
   TrafficLight          = "󱠪",
   Tree                  = "",

config/nvim/lua/fschauen/util/lualine.lua

@@ -38,4 +38,37 @@ M.dynamic_color = function(base)
   return component
 end
 
+---@class LualineIndicatorSpec
+---@field icon string The icon to show when the indicator is active.
+---@field cond function A function that returns true when the indicator should
+---                     be visible, false otherwise.
+
+---Make a lualine indicator that shows an icon when a condition is true.
+---@param spec LualineIndicatorSpec
+---@return table component
+M.indicator = function(spec)
+  vim.validate {
+    spec = { spec, "table" },
+    icon = { spec.icon, "string" },
+    cond = { spec.cond, "function" },
+  }
+
+  local component = require("lualine.component"):extend()
+
+  function component:init(options)
+    component.super.init(
+      self,
+      vim.tbl_deep_extend(
+        "keep",
+        options or {},
+        { cond = spec.cond or function() return false end }
+      )
+    )
+  end
+
+  function component:update_status(--[[is_focused]]_) return spec.icon or "?" end
+
+  return component
+end
+
 return M

config/nvim/lua/lualine/components/fschauen/spell.lua

@@ -1,14 +0,0 @@
-local M = require("lualine.component"):extend()
-
-function M:init(options)
-  M.super.init(
-    self,
-    vim.tbl_deep_extend("keep", options or {}, {
-      cond = function() return vim.o.spell end,
-    })
-  )
-end
-
-function M:update_status(--[[is_focused]]_) return "󰓆" end
-
-return M

config/nvim/lua/lualine/components/fschauen/wrap.lua

@@ -1,14 +0,0 @@
-local M = require("lualine.component"):extend()
-
-function M:init(options)
-  M.super.init(
-    self,
-    vim.tbl_deep_extend("keep", options or {}, {
-      cond = function() return vim.o.wrap end,
-    })
-  )
-end
-
-function M:update_status(--[[is_focused]]_) return "󰖶" end
-
-return M