Switch from 48px weight 600 material symbol icons to 24px weight 400 icons (#28064)

lib/tasks/icons.rake

@@ -0,0 +1,56 @@
+# frozen_string_literal: true
+
+def download_material_icon(icon, weight: 400, filled: false, size: 20)
+  url_template = Addressable::Template.new('https://fonts.gstatic.com/s/i/short-term/release/materialsymbolsoutlined/{icon}/{axes}/{size}px.svg')
+
+  variant = filled ? '-fill' : ''
+
+  axes = []
+  axes << "wght#{weight}" if weight != 400
+  axes << 'fill1' if filled
+  axes = axes.join.presence || 'default'
+
+  url = url_template.expand(icon: icon, axes: axes, size: size).to_s
+  path = Rails.root.join('app', 'javascript', 'material-icons', "#{weight}-#{size}px", "#{icon}#{variant}.svg")
+  FileUtils.mkdir_p(File.dirname(path))
+
+  File.write(path, HTTP.get(url).to_s)
+end
+
+def find_used_icons
+  icons_by_weight_and_size = {}
+
+  Dir[Rails.root.join('app', 'javascript', '**', '*.*s*')].map do |path|
+    File.open(path, 'r') do |file|
+      pattern = %r{\Aimport .* from 'mastodon/../material-icons/(?<weight>[0-9]+)-(?<size>[0-9]+)px/(?<icon>[^-]*)(?<fill>-fill)?.svg\?react';}
+      file.each_line do |line|
+        match = pattern.match(line)
+        next if match.blank?
+
+        weight = match['weight'].to_i
+        size = match['size'].to_i
+
+        icons_by_weight_and_size[weight] ||= {}
+        icons_by_weight_and_size[weight][size] ||= Set.new
+
+        icons_by_weight_and_size[weight][size] << match['icon']
+      end
+    end
+  end
+
+  icons_by_weight_and_size
+end
+
+namespace :icons do
+  desc 'Download used Material Symbols icons'
+  task download: :environment do
+    find_used_icons.each do |weight, icons_by_size|
+      icons_by_size.each do |size, icons|
+        icons.each do |icon|
+          download_material_icon(icon, weight: weight, size: size)
+          download_material_icon(icon, weight: weight, size: size, filled: true)
+        end
+      end
+    end
+  end
+end