test1 @ 7102d64

@@ -0,0 +1,50 @@
+package envy
+
+import (
+	"os"
+	"strconv"
+	"time"
+)
+
+func Get[T comparable](key string) T {
+	var zero T
+	val, ok := os.LookupEnv(key)
+	if !ok {
+		return zero
+	}
+
+	var res any
+	switch any(zero).(type) {
+	case string:
+		res = val
+	case int:
+		if n, err := strconv.Atoi(val); err == nil {
+			res = n
+		}
+	case int64:
+		if n, err := strconv.ParseInt(val, 10, 64); err == nil {
+			res = n
+		}
+	case float64:
+		if f, err := strconv.ParseFloat(val, 64); err == nil {
+			res = f
+		}
+	case bool:
+		if b, err := strconv.ParseBool(val); err == nil {
+			res = b
+		}
+	case time.Duration:
+		if d, err := time.ParseDuration(val); err == nil {
+			res = d
+		}
+	}
+	return res.(T)
+}
+
+func GetOrDefault[T comparable](key string, def T) T {
+	var zero T
+	if val := Get[T](key); val != zero {
+		return val
+	}
+	return def
+}

@@ -0,0 +1,74 @@
+package envy_test
+
+import (
+	"testing"
+	"time"
+
+	"olexsmir.xyz/x/envy"
+	"olexsmir.xyz/x/is"
+)
+
+func TestGet(t *testing.T) {
+	env := "TESTING"
+	t.Run("string", func(t *testing.T) {
+		t.Setenv(env, "asdf")
+		is.Equal(t, "asdf", envy.Get[string](env))
+	})
+	t.Run("string, not set", func(t *testing.T) {
+		is.Equal(t, "", envy.Get[string](env))
+	})
+
+	t.Run("int", func(t *testing.T) {
+		t.Setenv("TESTING", "123")
+		is.Equal(t, 123, envy.Get[int](env))
+	})
+	t.Run("int, not set", func(t *testing.T) {
+		is.Equal(t, 0, envy.Get[int](env))
+	})
+
+	t.Run("int64", func(t *testing.T) {
+		t.Setenv(env, "112233")
+		is.Equal(t, 112233, envy.Get[int64](env))
+	})
+	t.Run("int64, not set", func(t *testing.T) {
+		is.Equal(t, 0, envy.Get[int64](env))
+	})
+
+	t.Run("float64", func(t *testing.T) {
+		t.Setenv(env, "123.123")
+		is.Equal(t, 123.123, envy.Get[float64](env))
+	})
+	t.Run("float64, not set", func(t *testing.T) {
+		is.Equal(t, 0, envy.Get[float64](env))
+	})
+
+	t.Run("bool", func(t *testing.T) {
+		t.Setenv(env, "true")
+		is.Equal(t, true, envy.Get[bool](env))
+	})
+	t.Run("bool, not set", func(t *testing.T) {
+		is.Equal(t, false, envy.Get[bool](env))
+	})
+
+	t.Run("time.Duration", func(t *testing.T) {
+		t.Setenv(env, "3s")
+		got := envy.Get[time.Duration](env)
+		is.Equal(t, 3*time.Second, got)
+	})
+	t.Run("time.Duration, not set", func(t *testing.T) {
+		got := envy.Get[time.Duration](env)
+		is.Equal(t, 0, got)
+	})
+}
+
+func TestGetOrDefault(t *testing.T) {
+	env := "TESTING"
+	t.Run("string, unset", func(t *testing.T) {
+		is.Equal(t, "asdf", envy.GetOrDefault(env, "asdf"))
+	})
+
+	t.Run("string, unset", func(t *testing.T) {
+		t.Setenv(env, "test")
+		is.Equal(t, "test", envy.GetOrDefault(env, "asdf"))
+	})
+}