Modify PuTTY sessions in Golang by editing the Windows Registry

main.go

package main

import (
	"fmt"
	"net/url"

	"golang.org/x/sys/windows/registry"
)

const (
	baseKey     = `SOFTWARE\SimonTatham\PuTTY\Sessions`
	beep        = 2 // Flash
	fontQuality = 3 // ClearType
	font        = "Consolas"
)

func main() {

	withOpenKey("", registry.ENUMERATE_SUB_KEYS, func(key registry.Key) {
		sessions, err := key.ReadSubKeyNames(-1)
		checkError(err)

		for _, session := range sessions {
			sessionNice, _ := url.QueryUnescape(session)
			fmt.Printf("%v\n", sessionNice)
			withOpenKey(session, registry.SET_VALUE, func(key registry.Key) {
				checkError(key.SetStringValue("Font", font))
				checkError(key.SetDWordValue("Beep", beep))
				checkError(key.SetDWordValue("FontQuality", fontQuality))
			})
		}

	})
}

func checkError(err error) {
	if err != nil {
		panic(err)
	}
}

func withOpenKey(key string, access uint32, innerFunc func(key registry.Key)) {
	keyName := baseKey
	if key != "" {
		keyName += `\` + key
	}

	k, err := registry.OpenKey(registry.CURRENT_USER, keyName, access)
	if err != nil {
		checkError(err)
	}
	defer k.Close()

	innerFunc(k)
}