Brainfuck interpreter in Go

brainfuck.go

package main
import (
    "strings"
    "fmt"
)
var cells  [30000]int
var commands []string
var ptr = 0
var pos = 0

func main() {
    commands := strings.Split("++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.", "")
    for pos != len(commands) {
        execute(commands)
        pos += 1
    }
}
func execute(commands []string) {
    switch commands[pos] {
        case ">": ptr += 1
        case "<": ptr -= 1
        case "+": cells[ptr] += 1
        case "-": cells[ptr] -= 1
        case "[": if cells[ptr] == 0 { nxt() }
        case "]": if cells[ptr] != 0 { lst() }
        case ".": fmt.Printf("%c", cells[ptr])
    }
}
func nxt()  {
    var brackets = 1
    for brackets != 0 {
        pos += 1
        switch commands[pos] {
            case "]": brackets--
            case "[": brackets++
        }
    }
}

func lst() {
    var brackets = 1
    for brackets != 0 {
        pos -= 1
        switch commands[pos] {
            case "]": brackets++
            case "[": brackets--
        }
    }
}