fix: Replace credo with styler (#170)

Contrary to [Credo](https://github.com/rrrene/credo), which requires
manual intervention, [Styler](https://github.com/adobe/elixir-styler)
applies changes and fixes automatically.

I've also synced the minimum supported Elixir version in the mix project
and in Styler. This means that Styler won't apply some rewrites (such as
`to_timeout`) until the project supports Elixir 1.17 or newer only.

Author: crbelaus

.credo.exs

@@ -1,10 +1,17 @@
 # Used by "mix format"
 locals_without_parens = [error_tracker_dashboard: 1, error_tracker_dashboard: 2]
 
+# Parse SemVer minor elixir version from project configuration
+# eg `"~> 1.15"` version requirement will yield `"1.15"`
+[elixir_minor_version | _] = Regex.run(~r/([\d\.]+)/, Mix.Project.config()[:elixir])
+
 [
   import_deps: [:ecto, :ecto_sql, :plug, :phoenix],
   inputs: ["{mix,.formatter,dev,dev.*}.exs", "{config,lib,test}/**/*.{heex,ex,exs}"],
-  plugins: [Phoenix.LiveView.HTMLFormatter],
+  plugins: [Phoenix.LiveView.HTMLFormatter, Styler],
   locals_without_parens: locals_without_parens,
-  export: [locals_without_parens: locals_without_parens]
+  export: [locals_without_parens: locals_without_parens],
+  styler: [
+    minimum_supported_elixir_version: "#{elixir_minor_version}.0"
+  ]
 ]

.formatter.exs

@@ -85,9 +85,6 @@ jobs:
       - name: Check application compile warnings
         run: mix compile --force --warnings-as-errors
 
-      - name: Check Credo warnings
-        run: mix credo
-
       - name: Run Tests - SQLite3
         run: mix test
         env:

.github/workflows/elixir.yml

@@ -1,16 +1,5 @@
 import Config
 
-config :tailwind,
-  version: "3.4.3",
-  default: [
-    args: ~w(
-      --config=tailwind.config.js
-      --input=css/app.css
-      --output=../priv/static/app.css
-    ),
-    cd: Path.expand("../assets", __DIR__)
-  ]
-
 config :bun,
   version: "1.1.18",
   default: [
@@ -19,32 +8,40 @@ config :bun,
     env: %{}
   ]
 
-# PostgreSQL adapter
-#
-# To use SQLite3 on your local development machine uncomment these lines and
-# comment the lines of other adapters.
-
-config :error_tracker, :ecto_adapter, :postgres
-
-config :error_tracker, ErrorTrackerDev.Repo,
-  url: "ecto://postgres:postgres@127.0.0.1/error_tracker_dev"
-
 # MySQL/MariaDB adapter
 #
 # To use MySQL/MariaDB on your local development machine uncomment these lines and
 # comment the lines of other adapters.
-
+#
 # config :error_tracker, :ecto_adapter, :mysql
-
+#
 # config :error_tracker, ErrorTrackerDev.Repo,
 #   url: "ecto://root:root@127.0.0.1/error_tracker_dev"
-
+#
 # SQLite3 adapter
 #
 # To use SQLite3 on your local development machine uncomment these lines and
 # comment the lines of other adapters.
-
+#
 # config :error_tracker, :ecto_adapter, :sqlite3
-
+#
 # config :error_tracker, ErrorTrackerDev.Repo,
 #   database: System.get_env("SQLITE_DB") || "dev.db"
+#
+# PostgreSQL adapter
+#
+# To use PostgreSQL on your local development machine uncomment these lines and
+# comment the lines of other adapters.
+config :error_tracker, ErrorTrackerDev.Repo, url: "ecto://postgres:postgres@127.0.0.1/error_tracker_dev"
+config :error_tracker, :ecto_adapter, :postgres
+
+config :tailwind,
+  version: "3.4.3",
+  default: [
+    args: ~w(
+      --config=tailwind.config.js
+      --input=css/app.css
+      --output=../priv/static/app.css
+      ),
+    cd: Path.expand("../assets", __DIR__)
+  ]

config/dev.example.exs

@@ -1,25 +1,28 @@
 import Config
 
-config :error_tracker, ErrorTracker.Test.Repo,
-  url: "ecto://postgres:postgres@127.0.0.1/error_tracker_test",
-  pool: Ecto.Adapters.SQL.Sandbox,
-  log: false
+alias Ecto.Adapters.SQL.Sandbox
+alias ErrorTracker.Test.Repo
 
-config :error_tracker, ErrorTracker.Test.MySQLRepo,
-  url: "ecto://root:root@127.0.0.1/error_tracker_test",
-  pool: Ecto.Adapters.SQL.Sandbox,
+config :error_tracker, ErrorTracker.Test.LiteRepo,
+  database: "priv/lite_repo/test.db",
+  pool: Sandbox,
   log: false,
   # Use the same migrations as the PostgreSQL repo
   priv: "priv/repo"
 
-config :error_tracker, ErrorTracker.Test.LiteRepo,
-  database: "priv/lite_repo/test.db",
-  pool: Ecto.Adapters.SQL.Sandbox,
+config :error_tracker, ErrorTracker.Test.MySQLRepo,
+  url: "ecto://root:root@127.0.0.1/error_tracker_test",
+  pool: Sandbox,
   log: false,
   # Use the same migrations as the PostgreSQL repo
   priv: "priv/repo"
 
-config :error_tracker, ecto_repos: [ErrorTracker.Test.Repo]
+config :error_tracker, Repo,
+  url: "ecto://postgres:postgres@127.0.0.1/error_tracker_test",
+  pool: Sandbox,
+  log: false
+
+config :error_tracker, ecto_repos: [Repo]
 
 # Repo is selected in the test_helper.exs based on the given ENV vars
 config :error_tracker, otp_app: :error_tracker