feat(rs): initial rust implementation for dotprompt (#390)

Author: yesudeep

.github/labeler.yml

@@ -20,6 +20,35 @@ root:
   - changed-files:
       - any-glob-to-any-file: "*"
 
+bazel:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "**/*.bazel"
+          - "**/*.bzl"
+          - "**/.bazel*"
+          - "**/MODULE.bazel*"
+          - "**/maven_install.json"
+
+java:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "**/*.java"
+          - "java/**"
+          - "**/maven_install.json"
+
+kotlin:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "**/*.kt"
+
+rust:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "**/*.rs"
+          - "**/Cargo.toml"
+          - "**/Cargo.lock"
+          - "rs/**"
+
 go:
   - changed-files:
       - any-glob-to-any-file:

.github/workflows/publish_rust.yml

@@ -0,0 +1,47 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+name: Publish Rust Package
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  publish-cargo:
+    runs-on: ubuntu-latest
+    # Only run for releases tagged with rs- prefix
+    if: startsWith(github.ref, 'refs/tags/rs-')
+    permissions:
+      contents: read
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Verify package
+        run: |
+          cd rs/dotprompt
+          cargo package --list
+
+      - name: Publish to crates.io
+        env:
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
+        run: |
+          cd rs/dotprompt
+          cargo publish --token "${CARGO_REGISTRY_TOKEN}"

.github/workflows/rust.yml

@@ -1,4 +1,4 @@
-# Copyright 2025 Google LLC
+# Copyright 2026 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -25,6 +25,36 @@ on:
       - ".github/workflows/rust.yml"
 
 jobs:
+  format-check:
+    name: Format Check
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt
+
+      - name: Check formatting
+        run: cargo fmt --all -- --check
+
+  clippy-lint:
+    name: Clippy Linting
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy
+
+      - name: Run clippy
+        run: cargo clippy --all-targets --workspace -- -D warnings
+
   check-build-test:
     name: Check, Build & Test (${{ matrix.toolchain }}, ${{ matrix.os_config.os }}-${{ matrix.os_config.arch }})
     runs-on: ${{ matrix.os_config.os }}
@@ -69,6 +99,17 @@ jobs:
         # Allow nightly tests to fail
         continue-on-error: ${{ matrix.toolchain == 'nightly' }}
 
+      - name: Verify SPEC_FILE support
+        env:
+          RUST_BACKTRACE: 1
+        run: |
+          find spec -name "*.yaml" | while read -r spec_file; do
+            relative_spec_file="../../$spec_file"
+            echo "Testing SPEC_FILE=$relative_spec_file"
+            SPEC_FILE="$relative_spec_file" cargo test --test spec_test -- --nocapture > /dev/null || exit 1
+          done
+        continue-on-error: ${{ matrix.toolchain == 'nightly' }}
+
   #check-build-test-musl-matrix:
   #  name: Check, Build & Test (${{ matrix.toolchain }}, alpine-${{ matrix.arch }}-musl)
   #  runs-on: ubuntu-latest # Runner OS
@@ -136,3 +177,4 @@ jobs:
   #      run: cargo test --all-targets --workspace --target ${{ matrix.target }}
   #      # Allow nightly tests to fail
   #      continue-on-error: ${{ matrix.toolchain == 'nightly' }}
+

.release-please-manifest.json

@@ -1,7 +1,8 @@
 {
-  "js": "1.1.1",
-  "python/dotpromptz": "0.1.4",
-  "python/handlebarrz": "0.1.3",
-  "go": "0.1.0",
-  "java": "0.1.0"
+  "js": "0.2.9",
+  "python/dotpromptz": "0.2.1",
+  "python/handlebarrz": "0.1.2",
+  "go": "0.2.0",
+  "java": "0.1.0",
+  "rs": "0.1.0"
 }