Add SQL and PL/pgSQL formatting library

.github/workflows/release.yaml

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+name: Publish to crates.io
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+
+    environment:
+      name: crates-io
+      url: https://crates.io/crates/libpgfmt
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v5
+
+      - name: Install stable Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache cargo registry and build
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: ${{ runner.os }}-cargo-release-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-release-
+
+      - name: Run tests
+        run: cargo test
+
+      - name: Verify version matches tag
+        run: |
+          TAG="${GITHUB_REF#refs/tags/v}"
+          CARGO_VERSION=$(grep '^version' Cargo.toml | head -1 | sed 's/.*"\(.*\)"/\1/')
+          if [ "$TAG" != "$CARGO_VERSION" ]; then
+            echo "Tag v$TAG does not match Cargo.toml version $CARGO_VERSION"
+            exit 1
+          fi
+
+      - name: Publish to crates.io
+        run: cargo publish
+        env:
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}

.github/workflows/testing.yaml

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+name: Testing
+on:
+  pull_request:
+  push:
+    branches: ["*"]
+    paths-ignore:
+      - "*.md"
+    tags-ignore: ["*"]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        rust: [stable, nightly]
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v5
+
+      - name: Install Rust ${{ matrix.rust }}
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.rust }}
+          components: clippy, rustfmt
+
+      - name: Cache cargo registry and build
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: ${{ runner.os }}-cargo-${{ matrix.rust }}-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-${{ matrix.rust }}-
+
+      - name: Check formatting
+        run: cargo fmt --check
+
+      - name: Run clippy
+        run: cargo clippy -- -D warnings
+
+      - name: Run tests
+        run: cargo test

.gitignore

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+/target

.pre-commit-config.yaml

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+repos:
+  - repo: local
+    hooks:
+      - id: cargo-fmt
+        name: cargo fmt
+        entry: cargo fmt --check
+        language: system
+        types: [rust]
+        pass_filenames: false
+
+      - id: cargo-clippy
+        name: cargo clippy
+        entry: cargo clippy -- -D warnings
+        language: system
+        types: [rust]
+        pass_filenames: false
+
+      - id: cargo-test
+        name: cargo test
+        entry: cargo test
+        language: system
+        types: [rust]
+        pass_filenames: false
+        stages: [pre-push]

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+libpgfmt is a Rust library for formatting PostgreSQL-specific SQL and PL/pgSQL.
+
+## Build Commands
+
+```sh
+cargo build
+cargo test
+cargo test <test_name>    # run a single test
+cargo clippy              # lint
+cargo fmt --check         # check formatting
+cargo fmt                 # auto-format
+```