ci: add dialyzer job

.github/workflows/ci.yml

@@ -12,9 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
-        with:
-          ref: ${{ github.head_ref }}
+        uses: actions/checkout@v4
       - name: Use Node.js 18.x
         uses: actions/setup-node@v3
         with:
@@ -27,7 +25,7 @@ jobs:
     name: Format/Credo
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Elixir
         uses: erlef/setup-beam@v1
         with:
@@ -45,11 +43,37 @@ jobs:
         run: mix format --check-formatted
       - name: Run Credo
         run: mix credo
+  dialyzer:
+    name: Dialyzer
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Elixir
+        uses: erlef/setup-beam@v1
+        with:
+          elixir-version: "1.19"
+          otp-version: "28"
+      - name: Restore dependencies cache
+        uses: actions/cache@v3
+        with:
+          path: deps
+          key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}
+          restore-keys: ${{ runner.os }}-mix-
+      - name: Restore dialyzer cache
+        uses: actions/cache@v3
+        with:
+          path: priv/plts
+          key: ${{ runner.os }}-mix-plts-${{ hashFiles('./priv/plts/') }}
+          restore-keys: ${{ runner.os }}-mix-plts-
+      - name: Install dependencies
+        run: mix deps.get
+      - name: Run dialyzer
+        run: mix dialyzer
   test:
     name: Test
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Elixir
         uses: erlef/setup-beam@v1
         with:

CHANGELOG.md

@@ -2,56 +2,55 @@
 
 All notable changes to this project will be documented in this file.
 
-The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## v0.5.1 - 2026-02-22
+## [0.5.1] - 2026-02-22
 
-**Added**
+### Added
 
-- Better documented typespecs. ([#11](https://github.com/codedge-llc/pane/pull/11))
-- More tests for `Pane.Page` and `Pane.Viewer`. ([#11](https://github.com/codedge-llc/pane/pull/11))
+- Better documented typespecs.
+- Unit tests for `Pane.Page` and `Pane.Viewer`.
 
-**Fixed**
+### Fixed
 
 - Terminal size detection on Windows (replaced `tput` with `:io.rows/0`).
-  ([#11](https://github.com/codedge-llc/pane/pull/11))
 
-## v0.5.0 - 2024-08-31
+## [0.5.0] - 2024-08-31
 
-**Changed**
+### Changed
 
 - Various documentation updates ([#5](https://github.com/codedge-llc/pane/pull/5)).
 - Bumped minimum Elixir version to 1.13.
 
-## v0.4.1 - 2021-02-27
+## [0.4.1] - 2021-02-27
 
-**Fixed**
+### Fixed
 
 - Include `:iex` in `:extra_applications` to remove compile warning.
 
-## v0.4.0 - 2020-09-28
+## [0.4.0] - 2020-09-28
 
-**Changed**
+### Changed
 
 - Bump minimum Elixir version to 1.5.
 
-**Fixed**
+### Fixed
 
 - Remove deprecated compile warnings.
 
-## v0.3.0 - 2018-01-18
+## [0.3.0] - 2018-01-18
 
 - Support for (f)first and (l)last page
 
-## v0.2.0 - 2018-01-03
+## [0.2.0] - 2018-01-03
 
 - Prompt to enable ANSI codes if disabled
 
-## v0.1.1 - 2017-03-16
+## [0.1.1] - 2017-03-16
 
 - Fix: crash on invalid key command
 
-## v0.1.0 - 2017-02-26
+## [0.1.0] - 2017-02-26
 
 - Initial release

lib/pane/viewer.ex

@@ -1,14 +1,14 @@
 defmodule Pane.Viewer do
   @moduledoc false
 
-  defstruct pages: [], total_pages: 0, index: 0
+  defstruct index: 0, pages: [], total_pages: 0
 
   use GenServer
 
   @type t :: %__MODULE__{
+          index: non_neg_integer(),
           pages: [Pane.Page.t()],
-          total_pages: non_neg_integer(),
-          index: non_neg_integer()
+          total_pages: non_neg_integer()
         }
 
   @default_max_lines 50
@@ -39,13 +39,13 @@ defmodule Pane.Viewer do
       iex> Pane.Viewer.init(data: "test")
       {:ok, %Pane.Viewer{
         index: 0,
-        total_pages: 1,
         pages: [
           %Pane.Page{
             data: "test",
             index: 0
           }
-        ]
+        ],
+        total_pages: 1
       }}
   """
   def init(opts) do