Add pre-commit hook for formatting and tests

- Add scripts/pre-commit hook that runs format check and tests
- Add mix hooks.install alias to install the hook
- Document git hooks in AGENTS.md
- Fix test database config to use local user

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

AGENTS.md

@@ -16,12 +16,19 @@ mix deps.get
 # Create database
 mix ecto.create
 
+# Install git hooks
+mix hooks.install
+
 # Start the server
 mix phx.server
 ```
 
 The app will be available at http://localhost:4000
 
+### Git hooks
+
+A pre-commit hook is provided that runs `mix format --check-formatted` and `mix test` before each commit. Install it with `mix hooks.install` or manually copy `scripts/pre-commit` to `.git/hooks/pre-commit`.
+
 ## Project guidelines
 
 - **Prefer small, focused commits** - each commit should represent a single logical change

config/test.exs

@@ -6,8 +6,8 @@ import Config
 # to provide built-in test partitioning in CI environment.
 # Run `mix help test` for more information.
 config :localspot, Localspot.Repo,
-  username: "postgres",
+  username: "kevinsivic",
-  password: "postgres",
+  password: "",
   hostname: "localhost",
   database: "localspot_test#{System.get_env("MIX_TEST_PARTITION")}",
   pool: Ecto.Adapters.SQL.Sandbox,

mix.exs

@@ -88,7 +88,14 @@ defmodule Localspot.MixProject do
         "esbuild localspot --minify",
         "phx.digest"
       ],
-      precommit: ["compile --warnings-as-errors", "deps.unlock --unused", "format", "test"]
+      precommit: ["compile --warnings-as-errors", "deps.unlock --unused", "format", "test"],
+      "hooks.install": &hooks_install/1
     ]
   end
+
+  defp hooks_install(_) do
+    File.cp!("scripts/pre-commit", ".git/hooks/pre-commit")
+    File.chmod!(".git/hooks/pre-commit", 0o755)
+    Mix.shell().info("Installed pre-commit hook")
+  end
 end

scripts/pre-commit

@@ -0,0 +1,28 @@
+#!/bin/sh
+#
+# Pre-commit hook for localspot
+# Runs formatting check and tests before allowing commits
+#
+# To install: cp scripts/pre-commit .git/hooks/pre-commit
+
+set -e
+
+echo "Running pre-commit checks..."
+
+# Check formatting (without modifying files)
+echo "Checking code formatting..."
+mix format --check-formatted
+if [ $? -ne 0 ]; then
+  echo "❌ Code is not formatted. Run 'mix format' to fix."
+  exit 1
+fi
+
+# Run tests
+echo "Running tests..."
+mix test
+if [ $? -ne 0 ]; then
+  echo "❌ Tests failed. Please fix before committing."
+  exit 1
+fi
+
+echo "✅ All pre-commit checks passed!"