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use std::str::FromStr;
use yaml_edit::YamlFile;
fn main() -> Result<(), Box<dyn std::error::Error>> {
let yaml_content = r#"
# Base configuration
defaults: &defaults
timeout: 30
retries: 3
enabled: true
log_level: info
# Production configuration merges defaults
production:
<<: *defaults
host: prod.example.com
port: 443
log_level: warning # Override default
# Development configuration also merges defaults
development:
<<: *defaults
host: localhost
port: 3000
debug: true
# Multiple merge keys example
base_db: &base_db
driver: postgres
pool_size: 10
base_cache: &base_cache
provider: redis
ttl: 3600
services:
api:
<<: [*base_db, *base_cache]
name: api_service
port: 8080
"#;
println!("Original YAML with merge keys:");
println!("{}", yaml_content);
println!("\n{}\n", "=".repeat(50));
// Parse the YAML
let yaml = YamlFile::from_str(yaml_content)?;
println!("Parsed and preserved YAML:");
println!("{}", yaml);
println!("\n{}\n", "=".repeat(50));
// The output should preserve all merge keys and references
let output = yaml.to_string();
// Verify output is preserved exactly
assert_eq!(output, yaml_content);
Ok(())
}
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