fix: 生成代码后，去掉无用的导包信息

Author: chenmingyong0423

example/generic_example.go

@@ -14,6 +14,11 @@
 
 package example
 
+import "context"
+
+// 用于添加 "context" 导包信息，以便在生成代码时判断是否成功去除该无用包信息
+var _ context.Context
+
 //go:generate go run ../cmd/optioner/main.go -type GenericExample
 type GenericExample[T any, U comparable, V ~int] struct {
 	A T `opt:"-"`

example/user.go

@@ -15,9 +15,13 @@
 package example
 
 import (
+	"context"
 	"github.com/chenmingyong0423/go-optioner/example/third_party"
 )
 
+// 用于添加 "context" 导包信息，以便在生成代码时判断是否成功去除该无用包信息
+var _ context.Context
+
 type Embedded struct{}
 
 type Embedded2 struct{}

go.mod

@@ -2,4 +2,9 @@ module github.com/chenmingyong0423/go-optioner
 
 go 1.21.0
 
-require github.com/chenmingyong0423/gkit v0.5.0
+require (
+	github.com/chenmingyong0423/gkit v0.5.0
+	golang.org/x/tools v0.19.0
+)
+
+require golang.org/x/mod v0.16.0 // indirect

go.sum

@@ -6,5 +6,9 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
+golang.org/x/mod v0.16.0 h1:QX4fJ0Rr5cPQCF7O9lh9Se4pmwfwskqZfq5moyldzic=
+golang.org/x/mod v0.16.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
+golang.org/x/tools v0.19.0 h1:tfGCXNR1OsFG+sVdLAitlpjAvD/I6dHDKnYrpEZUHkw=
+golang.org/x/tools v0.19.0/go.mod h1:qoJWxmGSIBmAeriMx19ogtrEPrGtDbPK634QFIcLAhc=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

options/options_generator.go

@@ -17,20 +17,19 @@ package options
 import (
 	"bytes"
 	"fmt"
+	"github.com/chenmingyong0423/gkit/stringx"
+	"github.com/chenmingyong0423/go-optioner/templates"
 	"go/ast"
 	"go/build"
-	"go/format"
 	"go/parser"
 	"go/token"
+	"golang.org/x/tools/imports"
 	"html/template"
 	"log"
 	"os"
 	"reflect"
 	"strconv"
 	"strings"
-
-	"github.com/chenmingyong0423/gkit/stringx"
-	"github.com/chenmingyong0423/go-optioner/templates"
 )
 
 type Generator struct {
@@ -189,9 +188,9 @@ func (g *Generator) OutputToFile() {
 }
 
 func (g *Generator) forMart() []byte {
-	source, err := format.Source(g.buf.Bytes())
+	source, err := imports.Process("", g.buf.Bytes(), nil)
 	if err != nil {
-		log.Fatal(err)
+		return nil
 	}
 	return source
 }