Automate publish on version changes (#56)

.github/workflows/outdated.yml

@@ -16,8 +16,8 @@ jobs:
       - name: Install OTP and Elixir
         uses: erlef/setup-beam@v1
         with:
-          otp-version: 24.0
-          elixir-version: 1.12.2
+          otp-version: 25.3
+          elixir-version: 1.14.3
 
       - name: Check outdated certdata
         run: |

.github/workflows/publish.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+changed_version="$(git diff --name-only HEAD~1 HEAD -- VERSION)"
+
+if [[ "${changed_version}" ]]; then
+  echo "Publishing because the version changed since the last commit"
+
+  git config user.name "${GITHUB_ACTOR}"
+  git config user.email "${GITHUB_ACTOR}@users.noreply.github.com"
+  git tag "v$(cat VERSION)"
+  git push --tags
+
+  mix hex.publish --yes
+else
+  echo "Not publishing since the version didn't change since last commit"
+fi

.github/workflows/publish.yml

@@ -0,0 +1,27 @@
+name: Publish
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  publish:
+    name: Publish
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install OTP and Elixir
+        uses: erlef/setup-beam@v1
+        with:
+          otp-version: 25.3
+          elixir-version: 1.14.3
+
+      - name: Publish
+        run: |
+          mix deps.get
+          mix compile
+          .github/workflows/publish.sh
+        env:
+          HEX_API_KEY: ${{ secrets.HEX_API_KEY }}

VERSION

@@ -0,0 +1 @@
+1.0.1

mix.exs

@@ -1,13 +1,12 @@
 defmodule CAStore.MixProject do
   use Mix.Project
 
-  @version "1.0.1"
   @repo_url "https://github.com/elixir-mint/castore"
 
   def project do
     [
       app: :castore,
-      version: @version,
+      version: version(),
       elixir: "~> 1.0",
       start_permanent: Mix.env() == :prod,
       deps: deps(),
@@ -20,7 +19,7 @@ defmodule CAStore.MixProject do
       # Docs
       name: "CAStore",
       docs: [
-        source_ref: "v#{@version}",
+        source_ref: "v#{version()}",
         source_url: @repo_url
       ]
     ]
@@ -48,4 +47,10 @@ defmodule CAStore.MixProject do
       links: %{"GitHub" => @repo_url}
     ]
   end
+
+  defp version do
+    "VERSION"
+    |> File.read!()
+    |> String.trim()
+  end
 end