example_test.go

package configparser_test

import (
	"fmt"
	"github.com/alyu/configparser"
	"log"
)

// Read and modify a configuration file
func Example() {
	config, err := configparser.Read("/etc/config.ini")
	if err != nil {
		log.Fatal(err)
	}
	// Print the full configuration
	fmt.Println(config)

	// get a section
	section, err := config.Section("MYSQLD DEFAULT")
	if err != nil {
		log.Fatal(err)
	} else {
		fmt.Printf("TotalSendBufferMemory=%s\n", section.ValueOf("TotalSendBufferMemory"))

		// set new value
		var oldValue = section.SetValueFor("TotalSendBufferMemory", "256M")
		fmt.Printf("TotalSendBufferMemory=%s, old value=%s\n", section.ValueOf("TotalSendBufferMemory"), oldValue)

		// delete option
		oldValue = section.Delete("DefaultOperationRedoProblemAction")
		fmt.Println("Deleted DefaultOperationRedoProblemAction: " + oldValue)

		// add new options
		section.Add("innodb_buffer_pool_size", "64G")
		section.Add("innodb_buffer_pool_instances", "8")
	}

	// add a new section and options
	section = config.NewSection("NDBD MGM")
	section.Add("NodeId", "2")
	section.Add("HostName", "10.10.10.10")
	section.Add("PortNumber", "1186")
	section.Add("ArbitrationRank", "1")

	// find all sections ending with .webservers
	sections, err := config.Find(".webservers$")
	if err != nil {
		log.Fatal(err)
	}
	for _, section := range sections {
		fmt.Print(section)
	}
	// or
	config.PrintSection("dc1.webservers")

	sections, err = config.Delete("NDB_MGMD DEFAULT")
	if err != nil {
		log.Fatal(err)
	}
	// deleted sections
	for _, section := range sections {
		fmt.Print(section)
	}

	options := section.Options()
	fmt.Println(options["HostName"])

	// save the new config. the original will be renamed to /etc/config.ini.bak
	err = configparser.Save(config, "/etc/config.ini")
	if err != nil {
		log.Fatal(err)
	}
}