Random function and persistence in Golang Program

My program is below:

What I'm trying to do is see if there is a way to create a random function or use a built in function that is able to use know what food in this program was selected from the random selection and have it not used again for another week? I currently have foods set from 1-6 but I want to make sure the same food for example 2 isn't selected twice in a row for a week. Also I want the program to be able to possibly write what the last item that was selected so it won't choose it again for atleast a week. Would i be able to accomplish this with a simple text file that can be read from?

package main
import (
"fmt"
"math/rand"
"time"
)
type Recipe struct { //Struct for recipe information
name        string
prepTime    int
cookTime    int
Ingredients []string //this is now a slice that will accept multiple elements
ID          int
Yield       int
}
func main() {
var recipe1 Recipe //Declare recipe1 of Type Recipe
var recipe2 Recipe
var recipe3 Recipe
/* recipe1 specifications */
recipe1.name = "BBQ Pulled Chicken"
recipe1.prepTime = 25
recipe1.cookTime = 5
recipe1.Ingredients = append(
recipe1.Ingredients,
"1 8-ounce can reduced-sodium tomato sauce",
)
recipe1.Ingredients = append(
recipe1.Ingredients,
"1/2 medium onion (grated),",
)
recipe1.ID = 1
recipe1.Yield = 8
/* Recipe 2 specifications */
recipe2.name = "Steak Tacos with Pineapple"
recipe2.prepTime = 45
recipe2.cookTime = 45
recipe2.Ingredients = append(
recipe2.Ingredients,
"3 tablespoons soy sauce,",
)
recipe2.Ingredients = append(
recipe2.Ingredients,
"1 tablespoon finely grated garlic,",
)
recipe2.Ingredients = append(
recipe2.Ingredients,
"1 tablespoon finely grated peeled fresh ginger,",
)
recipe2.Ingredients = append(
recipe2.Ingredients,
"1 1/2 pounds skirt steak, cut into 5-inch lengths,",
)
recipe2.Ingredients = append(
recipe2.Ingredients,
"Salt",
)
recipe2.Ingredients = append(
recipe2.Ingredients,
"Pepper",
)
recipe2.ID = 2
recipe2.Yield = 4
recipe3.name = "Simple Lemon Herb Chicken"
recipe3.prepTime = 10
recipe3.cookTime = 15
recipe3.Ingredients = append(
recipe3.Ingredients,
"2 skinless boneless chicken breast halves,",
)
recipe3.Ingredients = append(
recipe3.Ingredients,
"1 Lemon,",
)
recipe3.Ingredients = append(
recipe3.Ingredients,
"Salt and Pepper to taste,",
)
recipe3.Ingredients = append(
recipe3.Ingredients,
"1 tablespoon olive oil,",
)
recipe3.Ingredients = append(
recipe3.Ingredients,
"2 sprigs fresh parsley (for garnish),",
)
recipe3.Ingredients = append(
recipe3.Ingredients,
"1 pinch dried oregano,",
)
recipe3.ID = 3
recipe3.Yield = 2
//call to printRecipe function below
printRecipe(recipe1)
totalTime(recipe1)
printRecipe(recipe2)
totalTime(recipe2)
printRecipe(recipe3)
totalTime(recipe3)
//choose random number for recipe
rand.Seed(time.Now().UTC().UnixNano())
myrand := random(1, 6)
fmt.Println(myrand)
//logic for recipe to choose
if myrand == 1 {
fmt.Println(1)
printRecipeOfTheDay(recipe1)
} else if myrand == 2 {
fmt.Println(2)
printRecipeOfTheDay(recipe2)
} else if myrand == 3 {
fmt.Println(3)
printRecipeOfTheDay(recipe3)
} else if myrand == 4 {
fmt.Println(4)
}
}
//function to print Recipe
func printRecipe(recipe Recipe) {
fmt.Printf("Recipe Name : %s\n", recipe.name)
fmt.Printf("Prep Time : %d\n", recipe.prepTime)
fmt.Printf("Cook Time : %d\n", recipe.cookTime)
fmt.Printf("Ingredients : %s\n", recipe.Ingredients)
fmt.Printf("Recipe ID : %d\n", recipe.ID)
}
//random number function
func random(min, max int) int {
return rand.Intn(max-min) + min
}
//function to print the winner for recipe of the day to use
//for either lunch or dinner
func printRecipeOfTheDay(recipe Recipe) {
fmt.Printf("The recipe of the day is : %s\n", recipe.name)
}
//Returns total time by addings cookTime and prepTime
func totalTime(recipe Recipe) {
fmt.Printf("The total time for this recipe is %d\n", recipe.cookTime+recipe.prepTime)
}

As @Volker said Perm is likely what you want to use. Here's an example that will generate the pseudo random list for you. You could just save that to a file json encoded. Then if you had 7 recipes you could use time.Weekday to grab a recipe number from the slice using the day of the week as key to the slice. Once you hit some pre-determined day just regenerate the slice and save.

package main
import "fmt"
import "math/rand"
import "time"
func main() {
r := rand.New(rand.NewSource(time.Now().UnixNano()))
i := r.Perm(6)
fmt.Printf("%v\n", i)
}