New slice and math utils and replaced environment utils with environm…

…ent package.

internal/environment/env.go

@@ -0,0 +1,43 @@
+package environment
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"time"
+)
+
+func StringVar(key, defaultValue string) string {
+	v := os.Getenv(key)
+	if v != "" {
+		return v
+	}
+	return defaultValue
+}
+
+func IntVar(key string, defaultValue int) (int, error) {
+	v := StringVar(key, fmt.Sprintf("%d", defaultValue))
+	pv, err := strconv.Atoi(v)
+	if err != nil {
+		return 0, fmt.Errorf("failed parsing int from environment variable %s", key)
+	}
+	return pv, nil
+}
+
+func BoolVar(key string, defaultValue bool) (bool, error) {
+	v := StringVar(key, strconv.FormatBool(defaultValue))
+	pv, err := strconv.ParseBool(v)
+	if err != nil {
+		return false, fmt.Errorf("failed parsing boolean from environment variable %s", key)
+	}
+	return pv, nil
+}
+
+func DurationVar(key string, defaultValue time.Duration) (time.Duration, error) {
+	v := StringVar(key, defaultValue.String())
+	pv, err := time.ParseDuration(v)
+	if err != nil {
+		return time.Second * 0, fmt.Errorf("failed parsing duration from environment variable %s", key)
+	}
+	return pv, nil
+}

internal/store/awsParameterStore.go

@@ -14,6 +14,7 @@ import (
 
 	"github.com/dotnetmentor/racoon/internal/api"
 	"github.com/dotnetmentor/racoon/internal/config"
+	"github.com/dotnetmentor/racoon/internal/environment"
 	"github.com/dotnetmentor/racoon/internal/utils"
 )
 
@@ -120,7 +121,7 @@ func (s *AwsParameterStore) Write(ctx config.AppContext, key, value, description
 }
 
 func newParameterStoreClient(ctx context.Context) (*ssm.Client, error) {
-	if awsRegion := utils.StringEnvVar("AWS_REGION", ""); awsRegion == "" {
+	if awsRegion := environment.StringVar("AWS_REGION", ""); awsRegion == "" {
 		return nil, fmt.Errorf("required environment variable AWS_REGION has no value set")
 	}
 

internal/utils/math.go

@@ -0,0 +1,8 @@
+package utils
+
+func Min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}

internal/utils/slice.go

@@ -26,3 +26,20 @@ func SliceDelete[T any](slice []T, match func(i T) bool) (result []T) {
 	}
 	return
 }
+
+func SliceTake[T any](slice []T, n int) (result []T) {
+	min := Min(len(slice), n)
+	for i := 0; i < min; i++ {
+		result = append(result, slice[i])
+	}
+	return
+}
+
+func SliceSkip[T any](slice []T, n int) (result []T) {
+	if n > 0 && n < len(slice) {
+		result = slice[n:]
+	} else {
+		result = slice
+	}
+	return
+}