Add Mix task to update Tailwind version

lib/mix/tasks/tailwind/update_version.ex

@@ -0,0 +1,45 @@
+defmodule Mix.Tasks.Tailwind.UpdateVersion do
+  use Mix.Task
+
+  @shortdoc "Update the configured tailwind versino to latest."
+  @moduledoc """
+  Update the configured tailwind versino to latest.
+  """
+
+  @impl Mix.Task
+  def run(_args) do
+    Application.ensure_all_started(:req)
+
+    current_version =
+      Application.get_env(:tailwind, :version)
+
+    latest_version_url =
+      "https://api.github.com/repos/tailwindlabs/tailwindcss/releases/latest"
+
+    latest_version =
+      Req.get!(latest_version_url).body["tag_name"]
+      |> String.replace_prefix("v", "")
+
+    if current_version !== latest_version do
+      Mix.Shell.IO.info(
+        "Updating tailwind configuration from #{current_version} to #{latest_version}"
+      )
+
+      config_file =
+        Path.expand("config/config.exs", File.cwd!())
+
+      config_contents = File.read!(config_file)
+
+      new_config_contents =
+        String.replace(
+          config_contents,
+          ~r{version: "#{current_version}"},
+          "version: \"#{latest_version}\""
+        )
+
+      File.write!(config_file, new_config_contents)
+    else
+      Mix.Shell.IO.info("tailwind configuration is up to date (#{current_version})")
+    end
+  end
+end

mise.toml

@@ -24,13 +24,18 @@ run = 'npm outdated'
 hide = true
 dir = 'assets'
 
+[tasks.tailwind-update]
+description = 'Update the Tailwind version configured in the project'
+run = 'mix tailwind.update_version'
+hide = true
+
 [tasks.setup]
 depends = ['npm-install']
 description = 'Install dependencies and setup the database'
 run = ['mix setup']
 
 [tasks.deps-update]
-depends = ['npm-update']
+depends = ['npm-update', 'tailwind-update']
 description = 'Update dependencies'
 run = ['mix deps.update --all']