generator: implement generator for builtin go types

* supported optional types are int*, uint*, float*, bytes, string, bool
* fully redo configuration for golangci-lint
* simple tests for encoding/decoding roundtrip

Author: bigbes

.golangci.yml

@@ -8,22 +8,54 @@ formatters:
     - goimports
 
 linters:
-  enable:
-    - forbidigo
-    - gocritic
-    - lll
-    - reassign
-    - unconvert
-    - gosec
-    - errorlint
-    - godot
-    - revive
-    - testpackage
-    - unused
+  default: all
+
+  disable:
+    - dupl
+    - cyclop
+    - wsl
+    - nlreturn
+    - ireturn
+    - wrapcheck
+
+  exclusions:
+    rules:
+      - path-except: cmd/generator/*.go
+        linters:
+        - forbidigo
+        - gochecknoglobals
 
   settings:
     godot:
       scope: all
     lll:
       line-length: 120
       tab-width: 4
+    wsl_v5:
+      allow-first-in-block: true
+      allow-whole-block: false
+      branch-max-lines: 2
+      case-max-lines: 0
+      default: all
+      disable:
+        - return
+        - assign-exclusive
+        - assign-expr
+    depguard:
+      rules:
+        main:
+          files:
+            - "$all"
+            - "!$test"
+          allow:
+            - $gostd
+            - "github.com/vmihailenco/msgpack/v5"
+            - "golang.org/x/text"
+        test:
+          files:
+            - "$test"
+          allow:
+            - $gostd
+            - "github.com/stretchr/testify"
+            - "github.com/vmihailenco/msgpack/v5"
+            - "github.com/tarantool/go-option"

bool.go

@@ -0,0 +1,38 @@
+package option_test
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/vmihailenco/msgpack/v5"
+
+	"github.com/tarantool/go-option"
+)
+
+func TestOptionalBool(t *testing.T) {
+	t.Parallel()
+
+	var buf bytes.Buffer
+
+	enc := msgpack.NewEncoder(&buf)
+	dec := msgpack.NewDecoder(&buf)
+
+	someBool := option.SomeBool(true)
+	assert.True(t, someBool.IsSome(), "Expected IsPresent() to return true")
+	require.NoError(t, someBool.EncodeMsgpack(enc))
+
+	var shouldBeSomeBool option.Bool
+	require.NoError(t, shouldBeSomeBool.DecodeMsgpack(dec))
+	assert.True(t, shouldBeSomeBool.IsSome(), "Expected IsPresent() to return true")
+	assert.Equal(t, someBool.Unwrap(), shouldBeSomeBool.Unwrap(), "Expected Value() to return the same value")
+
+	emptyBool := option.NoneBool()
+	assert.False(t, emptyBool.IsSome(), "Expected IsPresent() to return false")
+	require.NoError(t, emptyBool.EncodeMsgpack(enc))
+
+	var shouldBeEmptyBool option.Bool
+	require.NoError(t, shouldBeEmptyBool.DecodeMsgpack(dec))
+	assert.False(t, shouldBeEmptyBool.IsSome(), "Expected IsPresent() to return false")
+}

bool_test.go

@@ -0,0 +1,38 @@
+package option_test
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/vmihailenco/msgpack/v5"
+
+	"github.com/tarantool/go-option"
+)
+
+func TestOptionalBytes(t *testing.T) {
+	t.Parallel()
+
+	var buf bytes.Buffer
+
+	enc := msgpack.NewEncoder(&buf)
+	dec := msgpack.NewDecoder(&buf)
+
+	someBytes := option.SomeBytes([]byte("1234"))
+	assert.True(t, someBytes.IsSome(), "Expected IsPresent() to return true")
+	require.NoError(t, someBytes.EncodeMsgpack(enc))
+
+	var shouldBeSomeBytes option.Bytes
+	require.NoError(t, shouldBeSomeBytes.DecodeMsgpack(dec))
+	assert.True(t, shouldBeSomeBytes.IsSome(), "Expected IsPresent() to return true")
+	assert.Equal(t, someBytes.Unwrap(), shouldBeSomeBytes.Unwrap(), "Expected Value() to return the same value")
+
+	emptyBytes := option.NoneBytes()
+	assert.False(t, emptyBytes.IsSome(), "Expected IsPresent() to return false")
+	require.NoError(t, emptyBytes.EncodeMsgpack(enc))
+
+	var shouldBeEmptyBytes option.Bytes
+	require.NoError(t, shouldBeEmptyBytes.DecodeMsgpack(dec))
+	assert.False(t, shouldBeEmptyBytes.IsSome(), "Expected IsPresent() to return false")
+}