feat(hl): highlight icons

lua/nonicons/colors.lua

@@ -0,0 +1,71 @@
+---@type table<string, { [1]: string, [2]: integer }>
+local M = {
+  ['angular'] = { '#e23237', 161 },
+  ['babel'] = { '#f9dc3e', 185 },
+  ['book'] = { '#a8b1c7', 146 },
+  ['c'] = { '#599eff', 111 },
+  ['c-plusplus'] = { '#f34b7d', 204 },
+  ['c-sharp'] = { '#68217a', 55 },
+  ['code'] = { '#a9b7c6', 145 },
+  ['css'] = { '#563d7c', 60 },
+  ['dart'] = { '#00b4ab', 37 },
+  ['database'] = { '#dad8d8', 188 },
+  ['diff'] = { '#41535b', 59 },
+  ['docker'] = { '#0db7ed', 39 },
+  ['elixir'] = { '#a074c4', 140 },
+  ['elm'] = { '#60b5cc', 74 },
+  ['eslint'] = { '#4b32c3', 56 },
+  ['file'] = { '#6d8086', 66 },
+  ['file-binary'] = { '#9f0500', 124 },
+  ['file-zip'] = { '#eca517', 214 },
+  ['gear'] = { '#6d8086', 66 },
+  ['git-branch'] = { '#f14e32', 196 },
+  ['git-commit'] = { '#f14e32', 196 },
+  ['globe'] = { '#519aba', 74 },
+  ['go'] = { '#00add8', 38 },
+  ['graphql'] = { '#e535ab', 199 },
+  ['html'] = { '#e34c26', 166 },
+  ['image'] = { '#a074c4', 140 },
+  ['java'] = { '#cc3e44', 167 },
+  ['javascript'] = { '#f1e05a', 185 },
+  ['json'] = { '#fbc02d', 220 },
+  ['key'] = { '#e6c419', 220 },
+  ['kotlin'] = { '#7f52ff', 99 },
+  ['law'] = { '#cbcb41', 185 },
+  ['lock'] = { '#bbbbbb', 250 },
+  ['log'] = { '#afb42b', 142 },
+  ['logo-github'] = { '#f0eff1', 255 },
+  ['lua'] = { '#51a0cf', 74 },
+  ['markdown'] = { '#519aba', 74 },
+  ['next'] = { '#a9b7c6', 145 },
+  ['nginx'] = { '#009639', 28 },
+  ['npm'] = { '#cb3837', 160 },
+  ['package'] = { '#cb3837', 160 },
+  ['perl'] = { '#39457e', 61 },
+  ['php'] = { '#4f5d95', 61 },
+  ['play'] = { '#e37933', 208 },
+  ['prettier'] = { '#56b3b4', 73 },
+  ['python'] = { '#3776ab', 68 },
+  ['r'] = { '#276dc3', 68 },
+  ['react'] = { '#61dafb', 75 },
+  ['rss'] = { '#f26522', 208 },
+  ['ruby'] = { '#cc342d', 160 },
+  ['rust'] = { '#dea584', 180 },
+  ['scala'] = { '#cc3e44', 167 },
+  ['server'] = { '#6d8086', 66 },
+  ['shield'] = { '#43853d', 35 },
+  ['svelte'] = { '#ff3e00', 202 },
+  ['swift'] = { '#f05138', 203 },
+  ['terminal'] = { '#4d4d4d', 239 },
+  ['terraform'] = { '#844fba', 135 },
+  ['tmux'] = { '#1bb91f', 34 },
+  ['toml'] = { '#9c4221', 130 },
+  ['typescript'] = { '#3178c6', 68 },
+  ['typography'] = { '#e34c26', 166 },
+  ['vim'] = { '#019833', 28 },
+  ['vue'] = { '#41b883', 35 },
+  ['yaml'] = { '#cb171e', 160 },
+  ['yarn'] = { '#2c8ebb', 68 },
+}
+
+return M

lua/nonicons/health.lua

@@ -7,7 +7,7 @@ function M.check()
   if ok and devicons then
     vim.health.ok('nvim-web-devicons available')
   else
-    vim.health.error('nvim-web-devicons not found')
+    vim.health.info('nvim-web-devicons not found (using built-in highlights)')
   end
 
   local result = vim.fn.system({ 'fc-list', ':family=nonicons' })

lua/nonicons/hi-test.lua

@@ -52,6 +52,10 @@ return function()
     string.format('  %-4s  %-28s  %-7s  %s', 'ICON', 'NAME', 'CODE', 'MAPPED FROM')
   lines[#lines + 1] = string.rep('-', 72)
 
+  local highlights = require('nonicons.highlights')
+  local icon_line_start = #lines
+  local icon_glyphs = {} ---@type string[]
+
   for _, name in ipairs(icon_names) do
     local sources = {} ---@type string[]
     if ext_by_icon[name] then
@@ -70,9 +74,11 @@ return function()
       end
     end
 
+    local glyph = char(name)
     local src_str = #sources > 0 and table.concat(sources, ', ') or ''
     lines[#lines + 1] =
-      string.format('  %s     %-28s  U+%04X  %s', char(name), name, mapping[name], src_str)
+      string.format('  %s     %-28s  U+%04X  %s', glyph, name, mapping[name], src_str)
+    icon_glyphs[#icon_glyphs + 1] = glyph
   end
 
   lines[#lines + 1] = ''
@@ -80,6 +86,14 @@ return function()
 
   local buf = vim.api.nvim_create_buf(false, true)
   vim.api.nvim_buf_set_lines(buf, 0, -1, false, lines)
+
+  for i, name in ipairs(icon_names) do
+    local hl = highlights.get(name)
+    local col_start = 2
+    local col_end = col_start + #icon_glyphs[i]
+    vim.api.nvim_buf_add_highlight(buf, -1, hl, icon_line_start + i - 1, col_start, col_end)
+  end
+
   vim.bo[buf].modifiable = false
   vim.bo[buf].buftype = 'nofile'
   vim.bo[buf].bufhidden = 'wipe'

lua/nonicons/highlights.lua

@@ -0,0 +1,37 @@
+local colors = require('nonicons.colors')
+
+local M = {}
+
+---@param icon_name string
+---@return string
+local function to_hl_group(icon_name)
+  local parts = {}
+  for part in icon_name:gmatch('[^-]+') do
+    parts[#parts + 1] = part:sub(1, 1):upper() .. part:sub(2)
+  end
+  return 'Nonicons' .. table.concat(parts)
+end
+
+local function apply()
+  for name, data in pairs(colors) do
+    vim.api.nvim_set_hl(0, to_hl_group(name), { fg = data[1], ctermfg = data[2] })
+  end
+end
+
+function M.setup()
+  apply()
+
+  local group = vim.api.nvim_create_augroup('NoniconsHighlights', { clear = true })
+  vim.api.nvim_create_autocmd('ColorScheme', {
+    group = group,
+    callback = apply,
+  })
+end
+
+---@param icon_name string
+---@return string hl_group
+function M.get(icon_name)
+  return to_hl_group(icon_name)
+end
+
+return M

lua/nonicons/init.lua

@@ -29,15 +29,18 @@ M.mapping = require('nonicons.mapping')
 
 ---@param name string Icon name
 ---@return string? glyph
+---@return string? hl_group
 function M.get(name)
   local code = M.mapping[name]
   if code then
-    return vim.fn.nr2char(code)
+    local hl = require('nonicons.highlights').get(name)
+    return vim.fn.nr2char(code), hl
   end
 end
 
 function M.apply()
   ensure_initialized()
+  require('nonicons.highlights').setup()
   if config.override then
     require('nonicons.override').apply()
   end
@@ -46,6 +49,7 @@ end
 ---@param name string? Filename (e.g. `'init.lua'`)
 ---@param ext string? File extension (e.g. `'lua'`)
 ---@return string? glyph
+---@return string? hl_group
 function M.get_icon(name, ext)
   local key = require('nonicons.resolve').resolve_name(name, ext)
   if key then
@@ -55,6 +59,7 @@ end
 
 ---@param ft string Vim filetype
 ---@return string? glyph
+---@return string? hl_group
 function M.get_icon_by_filetype(ft)
   local key = require('nonicons.resolve').resolve_filetype(ft)
   if key then