# Comments start with #
key: value                    # Simple key-value
list:                         # Lists use dash prefix
  - item1
  - item2
nested:                       # Nested objects
  key1: value1
  key2: value2
multiline: |                  # Literal block scalar
  Line 1
  Line 2
flow: >                       # Folded block scalar
  This is a long
  sentence that folds

string: "value"               # Quoted string
unquoted: value               # Unquoted string
number: 42                    # Integer
float: 3.14                   # Float
boolean: true                 # Boolean (true/false, yes/no, on/off)
null_value: null              # Null
empty: ~                      # Also null
multiline_string: |
  This preserves
  newlines

# Correct
parent:
  child: value
  list:
    - item1
    - item2

# Incorrect - mixed tabs/spaces
parent:
	child: value  # Tab character!

# Incorrect - wrong indentation
parent:
 child: value   # Only 1 space

# Wrong
parent:
	child: value

# Correct
parent:
  child: value

# Wrong
key value

# Correct
key: value

# Wrong
message: Error: something went wrong

# Correct
message: "Error: something went wrong"

# Wrong
config:
  key: value1
  key: value2

# Correct
config:
  key: value1
  other_key: value2

# Wrong - parsed as boolean true
country: YES

# Correct
country: "YES"

---
# Your content here

name: Workflow Name
on: [push, pull_request]        # Event triggers
jobs:
  job-name:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Step name
        run: echo "Hello"

version: "3.8"
services:
  app:
    image: node:18
    ports:
      - "3000:3000"
    environment:
      - NODE_ENV=production

apiVersion: v1
kind: Pod
metadata:
  name: my-pod
spec:
  containers:
    - name: container-name
      image: nginx:latest

# Basic syntax check
python3 -c "import yaml; yaml.safe_load(open('file.yml'))"

# With better error messages
python3 -c "
import yaml
try:
    with open('file.yml') as f:
        yaml.safe_load(f)
    print('✓ Valid YAML')
except yaml.YAMLError as e:
    print(f'✗ Error: {e}')
"

# Install yamllint (recommended)
pip install yamllint

# Validate single file
yamllint file.yml

# Validate with config
yamllint -c .yamllint file.yml

# Check all YAML files
find . -name "*.yml" -o -name "*.yaml" | xargs yamllint

# Using Python (if yamllint not available)
python3 -c "
import yaml
import sys
errors = []
for file in sys.argv[1:]:
    try:
        with open(file) as f:
            yaml.safe_load(f)
        print(f'✓ {file}')
    except Exception as e:
        errors.append(f'✗ {file}: {e}')
        print(f'✗ {file}: {e}')
sys.exit(1 if errors else 0)
" file1.yml file2.yml

---
yaml-files:
  - '*.yml'
  - '*.yaml'

rules:
  braces:
    min-spaces-inside: 0
    max-spaces-inside: 0
  brackets:
    min-spaces-inside: 0
    max-spaces-inside: 0
  colons:
    max-spaces-after: 1
    max-spaces-before: 0
  commas:
    max-spaces-after: 1
    max-spaces-before: 0
  comments:
    min-spaces-from-content: 1
    require-starting-space: true
  comments-indentation: disable
  document-end: disable
  document-start: disable
  empty-lines:
    max: 2
  empty-values: disable
  indentation:
    spaces: 2
    indent-sequences: true
    check-multi-line-strings: false
  key-duplicates: enable
  key-ordering: disable
  line-length:
    max: 120
  new-line-at-end-of-file: enable
  new-lines:
    type: unix
  octal-values: disable
  quoted-strings: disable
  trailing-spaces: enable
  truthy: disable

## YAML Validation Report

### Summary
- Files Checked: 5
- Errors: 2
- Warnings: 3
- Status: FAIL

### file1.yml
✓ Valid YAML syntax
⚠ Warning (Line 15): Line too long (145 > 120)

### file2.yml
✗ Error (Line 8, Col 5): Invalid indentation
   Current: 4 spaces
   Expected: 2 spaces
✗ Error (Line 12): Duplicate key "name"

### file3.yml
✓ Valid YAML syntax
⚠ Warning (Line 20): Trailing spaces

---
name: Rust CI
on:
  push:
    branches: [main, develop]
  pull_request:
    branches: [main]

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Run tests
        run: cargo test --all

---
version: "3.8"

services:
  app:
    build: .
    ports:
      - "3000:3000"
    environment:
      NODE_ENV: production
    depends_on:
      - db

  db:
    image: postgres:15
    volumes:
      - pgdata:/var/lib/postgresql/data

volumes:
  pgdata:

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: web-deployment
  labels:
    app: web
spec:
  replicas: 3
  selector:
    matchLabels:
      app: web
  template:
    metadata:
      labels:
        app: web
    spec:
      containers:
        - name: web
          image: nginx:alpine
          ports:
            - containerPort: 80

# Fix trailing spaces
sed -i 's/[[:space:]]*$//' file.yml

# Convert tabs to spaces
sed -i 's/\t/  /g' file.yml

# Ensure newline at end
sed -i -e '$a\' file.yml