Rewrite backend in Rust

.github/actions/package/action.yml

@@ -0,0 +1,30 @@
+name: Package archive
+description: Package a release binary with project metadata.
+
+inputs:
+  target:
+    description: Rust target triple used in the archive name.
+    required: true
+
+runs:
+  using: composite
+  steps:
+    - name: Package (unix)
+      if: runner.os != 'Windows'
+      shell: bash
+      run: |
+        name="diffs-${{ inputs.target }}"
+        mkdir -p "dist/${name}"
+        cp target/release/diffs "dist/${name}/"
+        cp LICENSE README.md "dist/${name}/"
+        tar -C "dist/${name}" -czf "dist/${name}.tar.gz" diffs LICENSE README.md
+
+    - name: Package (windows)
+      if: runner.os == 'Windows'
+      shell: pwsh
+      run: |
+        $name = "diffs-${{ inputs.target }}"
+        New-Item -ItemType Directory -Force -Path "dist/$name" | Out-Null
+        Copy-Item target/release/diffs.exe "dist/$name/"
+        Copy-Item LICENSE,README.md "dist/$name/"
+        Compress-Archive -Path "dist/$name/*" -DestinationPath "dist/$name.zip"

.github/workflows/ci.yml

@@ -13,88 +13,151 @@ concurrency:
   group: ci-${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+env:
+  CARGO_TERM_COLOR: always
+
 jobs:
-  lint:
-    name: Lint
+  web:
+    name: Build web assets
     runs-on: ubuntu-latest
 
     steps:
       - name: Checkout
         uses: actions/checkout@v6
 
-      - name: Setup Go
-        uses: actions/setup-go@v6
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v6
+
+      - name: Setup Node
+        uses: actions/setup-node@v6
         with:
-          go-version-file: go.mod
-          cache-dependency-path: go.sum
+          node-version: 24
+          cache: pnpm
+          cache-dependency-path: pnpm-lock.yaml
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Lint web
+        run: pnpm --dir web lint
+
+      - name: Build web
+        run: pnpm --dir web build
 
-      - name: Run golangci-lint
-        uses: golangci/golangci-lint-action@v9
+      - name: Upload web assets
+        uses: actions/upload-artifact@v7
         with:
-          version: v2.12
+          name: web-dist
+          path: web/dist
+          if-no-files-found: error
+          retention-days: 1
 
-  test:
-    name: Test
+  fmt:
+    name: Format
     runs-on: ubuntu-latest
 
     steps:
       - name: Checkout
         uses: actions/checkout@v6
 
-      - name: Setup pnpm
-        uses: pnpm/action-setup@v6
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt
 
-      - name: Setup Node
-        uses: actions/setup-node@v6
+      - name: Check formatting
+        run: cargo fmt --all --check
+
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    needs: web
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Download web assets
+        uses: actions/download-artifact@v7
         with:
-          node-version: 24
-          cache: pnpm
-          cache-dependency-path: pnpm-lock.yaml
+          name: web-dist
+          path: web/dist
 
-      - name: Setup Go
-        uses: actions/setup-go@v6
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@stable
         with:
-          go-version-file: go.mod
-          cache-dependency-path: go.sum
+          components: clippy
 
-      - name: Install dependencies
-        run: pnpm install --frozen-lockfile
+      - name: Cache cargo
+        uses: Swatinem/rust-cache@v2
+
+      - name: Run clippy
+        run: cargo clippy --all-targets --all-features --locked -- -D warnings
+
+  test:
+    name: Test
+    needs: web
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Download web assets
+        uses: actions/download-artifact@v7
+        with:
+          name: web-dist
+          path: web/dist
+
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache cargo
+        uses: Swatinem/rust-cache@v2
 
       - name: Run tests
-        run: pnpm test
+        run: cargo test --all-targets --locked
 
   snapshot:
-    name: Snapshot build
-    runs-on: ubuntu-latest
-    needs:
-      - lint
-      - test
+    name: Release build (${{ matrix.target }})
+    needs: web
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - runner: ubuntu-latest
+            target: x86_64-unknown-linux-gnu
+          - runner: windows-latest
+            target: x86_64-pc-windows-msvc
+    runs-on: ${{ matrix.runner }}
 
     steps:
       - name: Checkout
         uses: actions/checkout@v6
+
+      - name: Download web assets
+        uses: actions/download-artifact@v7
         with:
-          fetch-depth: 0
+          name: web-dist
+          path: web/dist
 
-      - name: Setup pnpm
-        uses: pnpm/action-setup@v6
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@stable
 
-      - name: Setup Node
-        uses: actions/setup-node@v6
-        with:
-          node-version: 24
-          cache: pnpm
-          cache-dependency-path: pnpm-lock.yaml
+      - name: Cache cargo
+        uses: Swatinem/rust-cache@v2
 
-      - name: Setup Go
-        uses: actions/setup-go@v6
-        with:
-          go-version-file: go.mod
-          cache-dependency-path: go.sum
+      - name: Build release binary
+        run: cargo build --release --locked
 
-      - name: Run GoReleaser snapshot
-        uses: goreleaser/goreleaser-action@v7
+      - name: Package archive
+        uses: ./.github/actions/package
         with:
-          distribution: goreleaser
-          version: "~> v2"
-          args: release --snapshot --clean
+          target: ${{ matrix.target }}