avoid generating long lines

.gitignore

@@ -13,3 +13,5 @@
 
 /internal/test/*_gen.go
 /dist/
+
+/gonstructor

README.md

@@ -89,23 +89,44 @@ type Structure struct {
 e.g.
 
 ```go
+type StructureBuilder struct {
+	foo        string
+	bar        io.Reader
+	buz        chan interface{}
+	bufferSize int
+}
+
 func NewStructureBuilder() *StructureBuilder {
 	return &StructureBuilder{}
 }
+
 func (b *StructureBuilder) Foo(foo string) *StructureBuilder {
 	b.foo = foo
 	return b
 }
+
 func (b *StructureBuilder) Bar(bar io.Reader) *StructureBuilder {
 	b.bar = bar
 	return b
 }
+
 func (b *StructureBuilder) Buz(buz chan interface{}) *StructureBuilder {
 	b.buz = buz
 	return b
 }
+
+func (b *StructureBuilder) BufferSize(bufferSize int) *StructureBuilder {
+	b.bufferSize = bufferSize
+	return b
+}
+
 func (b *StructureBuilder) Build() *Structure {
-	return &Structure{foo: b.foo, bar: b.bar, Buz: b.buz}
+	return &Structure{
+		foo:        b.foo,
+		bar:        b.bar,
+		Buz:        b.buz,
+		bufferSize: b.bufferSize,
+	}
 }
 ```
 
@@ -138,10 +159,22 @@ func (structure *Structure) construct() {
 e.g.
 
 ```go
-func NewStructure(foo string, bar io.Reader, buz chan interface{}, bufferSize int) *Structure {
-        r := &Structure{foo: foo, bar: bar, Buz: buz, bufferSize: bufferSize}
-        r.construct()
-        return r
+func NewStructure(
+	foo string,
+	bar io.Reader,
+	buz chan interface{},
+	bufferSize int,
+) *Structure {
+	r := &Structure{
+		foo:        foo,
+		bar:        bar,
+		Buz:        buz,
+		bufferSize: bufferSize,
+	}
+
+	r.construct()
+
+	return r
 }
 ```
 

cmd/gonstructor/gonstructor.go

@@ -85,17 +85,20 @@ func main() {
 				Fields:   fields,
 				InitFunc: *initFunc,
 			}
+
 		case builderConstructorType:
 			constructorGenerator = &constructor.BuilderGenerator{
 				TypeName: *typeName,
 				Fields:   fields,
 				InitFunc: *initFunc,
 			}
+
 		default:
 			// unreachable, just in case
 			log.Fatalf("[error] unexpected constructor type has come [given=%s]", constructorType)
 		}
-		rootStmt = rootStmt.AddStatements(constructorGenerator.Generate())
+
+		rootStmt = rootStmt.AddStatements(constructorGenerator.Generate(0))
 	}
 
 	if *withGetter {

go.mod

@@ -3,8 +3,11 @@ module github.com/moznion/gonstructor
 go 1.13
 
 require (
-	github.com/iancoleman/strcase v0.0.0-20180726023541-3605ed457bf7
+	github.com/alecthomas/chroma v0.7.3 // indirect
+	github.com/iancoleman/strcase v0.0.0-20191112232945-16388991a334
 	github.com/moznion/gowrtr v1.4.0
 	github.com/stretchr/testify v1.3.0
-	golang.org/x/tools v0.0.0-20191206204035-259af5ff87bd
+	golang.org/x/tools v0.0.0-20200117220505-0cba7a3a9ee9
 )
+
+replace github.com/moznion/gowrtr => /home/operator/go/src/github.com/moznion/gowrtr

go.sum

@@ -1,27 +1,59 @@
+github.com/alecthomas/assert v0.0.0-20170929043011-405dbfeb8e38/go.mod h1:r7bzyVFMNntcxPZXK3/+KdruV1H5KSlyVY0gc+NgInI=
+github.com/alecthomas/chroma v0.7.3 h1:NfdAERMy+esYQs8OXk0I868/qDxxCEo7FMz1WIqMAeI=
+github.com/alecthomas/chroma v0.7.3/go.mod h1:sko8vR34/90zvl5QdcUdvzL3J8NKjAUx9va9jPuFNoM=
+github.com/alecthomas/colour v0.0.0-20160524082231-60882d9e2721/go.mod h1:QO9JBoKquHd+jz9nshCh40fOfO+JzsoXy8qTHF68zU0=
+github.com/alecthomas/kong v0.2.4/go.mod h1:kQOmtJgV+Lb4aj+I2LEn40cbtawdWJ9Y8QLq+lElKxE=
+github.com/alecthomas/repr v0.0.0-20180818092828-117648cd9897/go.mod h1:xTS7Pm1pD1mvyM075QCDSRqH6qRLXylzS24ZTpRiSzQ=
+github.com/danwakefield/fnmatch v0.0.0-20160403171240-cbb64ac3d964 h1:y5HC9v93H5EPKqaS1UYVg1uYah5Xf51mBfIoWehClUQ=
+github.com/danwakefield/fnmatch v0.0.0-20160403171240-cbb64ac3d964/go.mod h1:Xd9hchkHSWYkEqJwUGisez3G1QY8Ryz0sdWrLPMGjLk=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dlclark/regexp2 v1.2.0 h1:8sAhBGEM0dRWogWqWyQeIJnxjWO6oIjl8FKqREDsGfk=
+github.com/dlclark/regexp2 v1.2.0/go.mod h1:2pZnwuY/m+8K6iRw6wQdMtk+rH5tNGR1i55kozfMjCc=
 github.com/iancoleman/strcase v0.0.0-20180726023541-3605ed457bf7 h1:ux/56T2xqZO/3cP1I2F86qpeoYPCOzk+KF/UH/Ar+lk=
 github.com/iancoleman/strcase v0.0.0-20180726023541-3605ed457bf7/go.mod h1:SK73tn/9oHe+/Y0h39VT4UCxmurVJkR5NA7kMEAOgSE=
+github.com/iancoleman/strcase v0.0.0-20191112232945-16388991a334 h1:VHgatEHNcBFEB7inlalqfNqw65aNkM1lGX2yt3NmbS8=
+github.com/iancoleman/strcase v0.0.0-20191112232945-16388991a334/go.mod h1:SK73tn/9oHe+/Y0h39VT4UCxmurVJkR5NA7kMEAOgSE=
+github.com/mattn/go-colorable v0.1.6/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
+github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
 github.com/moznion/go-errgen v1.3.1/go.mod h1:+BkSRLNc98WWAJmdtxYcxxucQ7sl8m4sroepmHio33Y=
 github.com/moznion/go-errgen v1.3.2/go.mod h1:dROwlwGrLPlSudszQRjX56OlWxWnG5tPGel0It/5LrI=
+github.com/moznion/go-errgen v1.8.1/go.mod h1:3mE7v+d7czyIqbfd3jOK/wLgRn5lTOtNRNEeCHXHaCk=
 github.com/moznion/gowrtr v0.0.0-20190121085203-08e30cf60446/go.mod h1:u2ZFWAHT1c56nmSP3w0C4N9MZtI2UE7YwbkItJAsF78=
 github.com/moznion/gowrtr v1.4.0 h1:vA2S5GyKGZq/CXEoFg/+8UrYbow9Rh2iQUUyNbH34IA=
 github.com/moznion/gowrtr v1.4.0/go.mod h1:5/DxTrHHNshUFR1aFL2q3kb+VRerTDKYcZbWu8bwa6s=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/sergi/go-diff v1.0.0/go.mod h1:0CfEIISq7TuYL3j771MWULgwwjU+GofnZX9QAmXWZgo=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/lint v0.0.0-20181217174547-8f45f776aaf1/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
+golang.org/x/lint v0.0.0-20191125180803-fdd1cda4f05f/go.mod h1:5qLYkcX4OjUUV8bRuDixDT3tpyyb+LUpUlRWLxfhWrs=
+golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200413165638-669c56c373c4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/tools v0.0.0-20190111214448-fc1d57b08d7b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190121143147-24cd39ecf745/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20191125144606-a911d9008d1f/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191206204035-259af5ff87bd h1:Zc7EU2PqpsNeIfOoVA7hvQX4cS3YDJEs5KlfatT3hLo=
 golang.org/x/tools v0.0.0-20191206204035-259af5ff87bd/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20200117220505-0cba7a3a9ee9 h1:KOkk4e2xd5OeCDJGwacvr75ICCbCsShrHiqPEdsA9hg=
+golang.org/x/tools v0.0.0-20200117220505-0cba7a3a9ee9/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

internal/constructor/all_args_constructor_generator.go

@@ -2,41 +2,48 @@ package constructor
 
 import (
 	"fmt"
-	"strings"
 
 	"github.com/iancoleman/strcase"
 	g "github.com/moznion/gowrtr/generator"
 )
 
-// AllArgsConstructorGenerator is a struct type that has the responsibility to generate a statement of a constructor with all of arguments.
+// AllArgsConstructorGenerator is a struct type that has the responsibility to
+// generate a statement of a constructor with all of arguments.
 type AllArgsConstructorGenerator struct {
 	TypeName string
 	Fields   []*Field
 	InitFunc string
 }
 
 // Generate generates a constructor statement with all of arguments.
-func (cg *AllArgsConstructorGenerator) Generate() g.Statement {
+func (cg *AllArgsConstructorGenerator) Generate(indentLevel int) g.Statement {
 	funcSignature := g.NewFuncSignature(fmt.Sprintf("New%s", strcase.ToCamel(cg.TypeName)))
 
 	retStructureKeyValues := make([]string, 0)
 	for _, field := range cg.Fields {
 		if field.ShouldIgnore {
 			continue
 		}
-		funcSignature = funcSignature.AddParameters(g.NewFuncParameter(toLowerCamel(field.FieldName), field.FieldType))
-		retStructureKeyValues = append(retStructureKeyValues, fmt.Sprintf("%s: %s", field.FieldName, toLowerCamel(field.FieldName)))
+		funcSignature = funcSignature.AddParameters(
+			g.NewFuncParameter(toLowerCamel(field.FieldName), field.FieldType),
+		)
+		retStructureKeyValues = append(
+			retStructureKeyValues,
+			fmt.Sprintf("%s: %s", field.FieldName, toLowerCamel(field.FieldName)),
+		)
 	}
 
 	funcSignature = funcSignature.AddReturnTypes("*" + cg.TypeName)
 
-	retStructure := fmt.Sprintf("&%s{%s}", cg.TypeName, strings.Join(retStructureKeyValues, ","))
+	retStructure := generateStructure(cg.TypeName, retStructureKeyValues, indentLevel+1)
 
 	var stmts []g.Statement
 	if cg.InitFunc != "" {
 		stmts = []g.Statement{
 			g.NewRawStatementf("r := %s", retStructure),
+			g.NewNewline(),
 			g.NewRawStatementf("r.%s()", cg.InitFunc),
+			g.NewNewline(),
 			g.NewReturnStatement("r"),
 		}
 	} else {
@@ -50,5 +57,6 @@ func (cg *AllArgsConstructorGenerator) Generate() g.Statement {
 		funcSignature,
 		stmts...,
 	)
+
 	return fn
 }

internal/constructor/builder_constructor_generator.go

@@ -2,7 +2,6 @@ package constructor
 
 import (
 	"fmt"
-	"strings"
 
 	"github.com/iancoleman/strcase"
 	g "github.com/moznion/gowrtr/generator"
@@ -16,7 +15,7 @@ type BuilderGenerator struct {
 }
 
 // Generate generates a builder statement.
-func (cg *BuilderGenerator) Generate() g.Statement {
+func (cg *BuilderGenerator) Generate(indentLevel int) g.Statement {
 	builderConstructorName := fmt.Sprintf("New%sBuilder", strcase.ToCamel(cg.TypeName))
 	builderType := fmt.Sprintf("%sBuilder", strcase.ToCamel(cg.TypeName))
 
@@ -52,7 +51,7 @@ func (cg *BuilderGenerator) Generate() g.Statement {
 		retStructureKeyValues = append(retStructureKeyValues, fmt.Sprintf("%s: b.%s", field.FieldName, toLowerCamel(field.FieldName)))
 	}
 
-	buildResult := fmt.Sprintf("&%s{%s}", cg.TypeName, strings.Join(retStructureKeyValues, ","))
+	buildResult := generateStructure(cg.TypeName, retStructureKeyValues, indentLevel+1)
 
 	var buildStmts []g.Statement
 	if cg.InitFunc != "" {
@@ -75,7 +74,7 @@ func (cg *BuilderGenerator) Generate() g.Statement {
 
 	stmt := g.NewRoot(builderStruct, builderConstructorFunc)
 	for _, f := range fieldRegistererFunctions {
-		stmt = stmt.AddStatements(f)
+		stmt = stmt.AddStatements(g.NewNewline(), f)
 	}
-	return stmt.AddStatements(buildFunc)
+	return stmt.AddStatements(g.NewNewline(), buildFunc)
 }

internal/constructor/generator.go

@@ -5,5 +5,5 @@ import g "github.com/moznion/gowrtr/generator"
 // Generator is an interface that has the responsibility to generate a constructor code.
 type Generator interface {
 	// Generate generates a constructor statement.
-	Generate() g.Statement
+	Generate(indentLevel int) g.Statement
 }

internal/constructor/struct.go

@@ -0,0 +1,21 @@
+package constructor
+
+import (
+	"fmt"
+	"strings"
+
+	g "github.com/moznion/gowrtr/generator"
+)
+
+func generateStructure(typeName string, keyValues []string, indentLevel int) string {
+	indent := g.BuildIndent(indentLevel)
+	nextIndent := g.BuildIndent(indentLevel + 1)
+
+	return fmt.Sprintf(
+		"&%s{\n%s%s,\n%s}",
+		typeName,
+		nextIndent,
+		strings.Join(keyValues, ",\n"+nextIndent),
+		indent,
+	)
+}