Add Homebrew packaging support

Add --version flag, GitHub Actions release workflow for building
macOS binaries (arm64 + x86_64), and manual formula update script.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sovanesyan

.github/workflows/release.yml

@@ -0,0 +1,114 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - "v*"
+
+permissions:
+  contents: write
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        include:
+          - os: macos-14
+            target: aarch64-apple-darwin
+          - os: macos-13
+            target: x86_64-apple-darwin
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: ${{ matrix.target }}
+
+      - name: Build
+        run: cargo build --release --target ${{ matrix.target }}
+
+      - name: Package
+        run: |
+          cd target/${{ matrix.target }}/release
+          tar czf ../../../calendarchy-${{ matrix.target }}.tar.gz calendarchy
+          cd ../../..
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: calendarchy-${{ matrix.target }}
+          path: calendarchy-${{ matrix.target }}.tar.gz
+
+  release:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Download artifacts
+        uses: actions/download-artifact@v4
+        with:
+          merge-multiple: true
+
+      - name: Compute SHA256 hashes
+        id: hashes
+        run: |
+          echo "arm64_sha256=$(sha256sum calendarchy-aarch64-apple-darwin.tar.gz | cut -d' ' -f1)" >> "$GITHUB_OUTPUT"
+          echo "x86_64_sha256=$(sha256sum calendarchy-x86_64-apple-darwin.tar.gz | cut -d' ' -f1)" >> "$GITHUB_OUTPUT"
+
+      - name: Create GitHub Release
+        uses: softprops/action-gh-release@v2
+        with:
+          generate_release_notes: true
+          files: |
+            calendarchy-aarch64-apple-darwin.tar.gz
+            calendarchy-x86_64-apple-darwin.tar.gz
+
+      - name: Update Homebrew formula
+        env:
+          TAP_TOKEN: ${{ secrets.HOMEBREW_TAP_TOKEN }}
+        run: |
+          VERSION="${GITHUB_REF_NAME#v}"
+          ARM64_SHA="${{ steps.hashes.outputs.arm64_sha256 }}"
+          X86_64_SHA="${{ steps.hashes.outputs.x86_64_sha256 }}"
+
+          cat > /tmp/calendarchy.rb << FORMULA
+          class Calendarchy < Formula
+            desc "Terminal calendar app for Google Calendar and iCloud"
+            homepage "https://github.com/sovanesyan/calendarchy"
+            version "${VERSION}"
+            license "MIT"
+
+            on_macos do
+              on_arm do
+                url "https://github.com/sovanesyan/calendarchy/releases/download/v#{version}/calendarchy-aarch64-apple-darwin.tar.gz"
+                sha256 "${ARM64_SHA}"
+              end
+              on_intel do
+                url "https://github.com/sovanesyan/calendarchy/releases/download/v#{version}/calendarchy-x86_64-apple-darwin.tar.gz"
+                sha256 "${X86_64_SHA}"
+              end
+            end
+
+            def install
+              bin.install "calendarchy"
+            end
+
+            test do
+              assert_match version.to_s, shell_output("#{bin}/calendarchy --version")
+            end
+          end
+          FORMULA
+
+          # Clone tap repo, update formula, push
+          git clone "https://x-access-token:${TAP_TOKEN}@github.com/sovanesyan/homebrew-calendarchy.git" /tmp/tap
+          mkdir -p /tmp/tap/Formula
+          cp /tmp/calendarchy.rb /tmp/tap/Formula/calendarchy.rb
+          cd /tmp/tap
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add Formula/calendarchy.rb
+          git commit -m "Update calendarchy to ${VERSION}" || exit 0
+          git push

scripts/update-formula.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+# Manual fallback: compute SHA256 hashes for a release and print formula values.
+# Usage: ./scripts/update-formula.sh v0.1.0
+
+set -euo pipefail
+
+VERSION="${1:?Usage: $0 <tag, e.g. v0.1.0>}"
+REPO="sovanesyan/calendarchy"
+BASE_URL="https://github.com/${REPO}/releases/download/${VERSION}"
+
+ARM64_URL="${BASE_URL}/calendarchy-aarch64-apple-darwin.tar.gz"
+X86_64_URL="${BASE_URL}/calendarchy-x86_64-apple-darwin.tar.gz"
+
+echo "Downloading arm64 tarball..."
+ARM64_SHA=$(curl -sL "$ARM64_URL" | shasum -a 256 | cut -d' ' -f1)
+
+echo "Downloading x86_64 tarball..."
+X86_64_SHA=$(curl -sL "$X86_64_URL" | shasum -a 256 | cut -d' ' -f1)
+
+echo ""
+echo "=== Update Formula/calendarchy.rb with these values ==="
+echo "version \"${VERSION#v}\""
+echo "arm64 sha256: \"${ARM64_SHA}\""
+echo "x86_64 sha256: \"${X86_64_SHA}\""

src/main.rs

@@ -59,6 +59,11 @@ enum AsyncMessage {
 
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    if std::env::args().any(|a| a == "--version" || a == "-V") {
+        println!("calendarchy {}", env!("CARGO_PKG_VERSION"));
+        return Ok(());
+    }
+
     let mut app = App::new();
 
     // Load config