cmd/doc: add -all flag to print all documentation for package

Unlike the one for the old godoc, you need the -u flag to see
unexported symbols. This seems like the right behavior: it's
consistent.

For now at least, the argument must be a package, not a symbol.
This is also different from old godoc.

Required a little refactoring but also cleaned up a few things.

Update #25595

Leaving the bug open for now until we tackle
	go doc -all symbol

Change-Id: Ibc1975bfa592cb1e92513eb2e5e9e11e01a60095
Reviewed-on: https://go-review.googlesource.com/c/141977
Run-TryBot: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>

src/cmd/doc/doc_test.go

@@ -147,6 +147,69 @@ var tests = []test{
 			`type T1 T2`,                       // Type alias does not display as type declaration.
 		},
 	},
+	// Package dump -all
+	{
+		"full package",
+		[]string{"-all", p},
+		[]string{
+			`package pkg .*import`,
+			`Package comment`,
+			`CONSTANTS`,
+			`Comment before ConstOne`,
+			`ConstOne = 1`,
+			`ConstTwo = 2 // Comment on line with ConstTwo`,
+			`ConstFive`,
+			`ConstSix`,
+			`Const block where first entry is unexported`,
+			`ConstLeft2, constRight2 uint64`,
+			`constLeft3, ConstRight3`,
+			`ConstLeft4, ConstRight4`,
+			`Duplicate = iota`,
+			`const CaseMatch = 1`,
+			`const Casematch = 2`,
+			`const ExportedConstant = 1`,
+			`const MultiLineConst = `,
+			`MultiLineString1`,
+			`VARIABLES`,
+			`Comment before VarOne`,
+			`VarOne = 1`,
+			`Comment about block of variables`,
+			`VarFive = 5`,
+			`var ExportedVariable = 1`,
+			`var LongLine = newLongLine\(`,
+			`var MultiLineVar = map\[struct {`,
+			`FUNCTIONS`,
+			`func ExportedFunc\(a int\) bool`,
+			`Comment about exported function`,
+			`func MultiLineFunc\(x interface`,
+			`func ReturnUnexported\(\) unexportedType`,
+			`TYPES`,
+			`type ExportedInterface interface`,
+			`type ExportedStructOneField struct`,
+			`type ExportedType struct`,
+			`Comment about exported type`,
+			`const ConstGroup4 ExportedType = ExportedType`,
+			`ExportedTypedConstant ExportedType = iota`,
+			`Constants tied to ExportedType`,
+			`func ExportedTypeConstructor\(\) \*ExportedType`,
+			`Comment about constructor for exported type`,
+			`func ReturnExported\(\) ExportedType`,
+			`func \(ExportedType\) ExportedMethod\(a int\) bool`,
+			`Comment about exported method`,
+			`type T1 = T2`,
+			`type T2 int`,
+		},
+		[]string{
+			`constThree`,
+			`_, _ uint64 = 2 \* iota, 1 << iota`,
+			`constLeft1, constRight1`,
+			`duplicate`,
+			`varFour`,
+			`func internalFunc`,
+			`unexportedField`,
+			`func \(unexportedType\)`,
+		},
+	},
 	// Package dump -u
 	{
 		"full package with u",
@@ -164,6 +227,58 @@ var tests = []test{
 			`MultiLine(String|Method|Field)`,   // No data from multi line portions.
 		},
 	},
+	// Package dump -u -all
+	{
+		"full package",
+		[]string{"-u", "-all", p},
+		[]string{
+			`package pkg .*import`,
+			`Package comment`,
+			`CONSTANTS`,
+			`Comment before ConstOne`,
+			`ConstOne += 1`,
+			`ConstTwo += 2 // Comment on line with ConstTwo`,
+			`constThree = 3 // Comment on line with constThree`,
+			`ConstFive`,
+			`const internalConstant += 2`,
+			`Comment about internal constant`,
+			`VARIABLES`,
+			`Comment before VarOne`,
+			`VarOne += 1`,
+			`Comment about block of variables`,
+			`varFour += 4`,
+			`VarFive += 5`,
+			`varSix += 6`,
+			`var ExportedVariable = 1`,
+			`var LongLine = newLongLine\(`,
+			`var MultiLineVar = map\[struct {`,
+			`var internalVariable = 2`,
+			`Comment about internal variable`,
+			`FUNCTIONS`,
+			`func ExportedFunc\(a int\) bool`,
+			`Comment about exported function`,
+			`func MultiLineFunc\(x interface`,
+			`func internalFunc\(a int\) bool`,
+			`Comment about internal function`,
+			`func newLongLine\(ss .*string\)`,
+			`TYPES`,
+			`type ExportedType struct`,
+			`type T1 = T2`,
+			`type T2 int`,
+			`type unexportedType int`,
+			`Comment about unexported type`,
+			`ConstGroup1 unexportedType = iota`,
+			`ConstGroup2`,
+			`ConstGroup3`,
+			`ExportedTypedConstant_unexported unexportedType = iota`,
+			`Constants tied to unexportedType`,
+			`const unexportedTypedConstant unexportedType = 1`,
+			`func ReturnUnexported\(\) unexportedType`,
+			`func \(unexportedType\) ExportedMethod\(\) bool`,
+			`func \(unexportedType\) unexportedMethod\(\) bool`,
+		},
+		nil,
+	},
 
 	// Single constant.
 	{
@@ -361,7 +476,6 @@ var tests = []test{
 			`io.Reader.*Comment on line with embedded Reader`,
 		},
 		[]string{
-			`int.*embedded`,                 // No unexported embedded field.
 			`Comment about exported method`, // No comment about exported method.
 			`unexportedMethod`,              // No unexported method.
 			`unexportedTypedConstant`,       // No unexported constant.

src/cmd/doc/main.go

@@ -31,6 +31,9 @@
 // The -src flag causes doc to print the full source code for the symbol, such
 // as the body of a struct, function or method.
 //
+// The -all flag causes doc to print all documentation for the package and
+// all its visible symbols. The argument must identify a package.
+//
 // For complete documentation, run "go help doc".
 package main
 
@@ -52,6 +55,7 @@ import (
 var (
 	unexported bool // -u flag
 	matchCase  bool // -c flag
+	showAll    bool // -all flag
 	showCmd    bool // -cmd flag
 	showSrc    bool // -src flag
 )
@@ -88,6 +92,7 @@ func do(writer io.Writer, flagSet *flag.FlagSet, args []string) (err error) {
 	matchCase = false
 	flagSet.BoolVar(&unexported, "u", false, "show unexported symbols as well as exported")
 	flagSet.BoolVar(&matchCase, "c", false, "symbol matching honors case (paths not affected)")
+	flagSet.BoolVar(&showAll, "all", false, "show all documentation for package")
 	flagSet.BoolVar(&showCmd, "cmd", false, "show symbols with package docs even if package is a command")
 	flagSet.BoolVar(&showSrc, "src", false, "show source code for symbol")
 	flagSet.Parse(args)
@@ -127,6 +132,15 @@ func do(writer io.Writer, flagSet *flag.FlagSet, args []string) (err error) {
 			unexported = true
 		}
 
+		// We have a package.
+		if showAll {
+			if symbol != "" {
+				return fmt.Errorf("-all valid only for package, not symbol: %s", symbol)
+			}
+			pkg.allDoc()
+			return
+		}
+
 		switch {
 		case symbol == "":
 			pkg.packageDoc() // The package exists, so we got some output.

src/cmd/doc/pkg.go

@@ -36,6 +36,9 @@ type Package struct {
 	file                 *ast.File    // Merged from all files in the package
 	doc                  *doc.Package
 	build                *build.Package
+	typedValue           map[*doc.Value]bool // Consts and vars related to types.
+	constructor          map[*doc.Func]bool  // Constructors.
+	packageClausePrinted bool                // Prevent repeated package clauses.
 	fs                   *token.FileSet      // Needed for printing.
 	buf                  bytes.Buffer
 }
@@ -142,10 +145,25 @@ func parsePackage(writer io.Writer, pkg *build.Package, userPath string) *Packag
 		mode |= doc.PreserveAST // See comment for Package.emit.
 	}
 	docPkg := doc.New(astPkg, pkg.ImportPath, mode)
+	typedValue := make(map[*doc.Value]bool)
+	constructor := make(map[*doc.Func]bool)
 	for _, typ := range docPkg.Types {
 		docPkg.Consts = append(docPkg.Consts, typ.Consts...)
+		for _, value := range typ.Consts {
+			typedValue[value] = true
+		}
 		docPkg.Vars = append(docPkg.Vars, typ.Vars...)
+		for _, value := range typ.Vars {
+			typedValue[value] = true
+		}
 		docPkg.Funcs = append(docPkg.Funcs, typ.Funcs...)
+		for _, fun := range typ.Funcs {
+			// We don't count it as a constructor bound to the type
+			// if the type itself is not exported.
+			if isExported(typ.Name) {
+				constructor[fun] = true
+			}
+		}
 	}
 
 	return &Package{
@@ -155,6 +173,8 @@ func parsePackage(writer io.Writer, pkg *build.Package, userPath string) *Packag
 		pkg:         astPkg,
 		file:        ast.MergePackageFiles(astPkg, 0),
 		doc:         docPkg,
+		typedValue:  typedValue,
+		constructor: constructor,
 		build:       pkg,
 		fs:          fs,
 	}
@@ -390,6 +410,68 @@ func joinStrings(ss []string) string {
 	return strings.Join(ss, ", ")
 }
 
+// allDoc prints all the docs for the package.
+func (pkg *Package) allDoc() {
+	defer pkg.flush()
+	if pkg.showInternals() {
+		pkg.packageClause(false)
+	}
+
+	doc.ToText(&pkg.buf, pkg.doc.Doc, "", indent, indentedWidth)
+	pkg.newlines(1)
+
+	printed := make(map[*ast.GenDecl]bool)
+
+	hdr := ""
+	printHdr := func(s string) {
+		if hdr != s {
+			pkg.Printf("\n%s\n\n", s)
+		}
+	}
+
+	// Constants.
+	for _, value := range pkg.doc.Consts {
+		// Constants and variables come in groups, and valueDoc prints
+		// all the items in the group. We only need to find one exported symbol.
+		for _, name := range value.Names {
+			if isExported(name) && !pkg.typedValue[value] {
+				printHdr("CONSTANTS")
+				pkg.valueDoc(value, printed)
+				break
+			}
+		}
+	}
+
+	// Variables.
+	for _, value := range pkg.doc.Vars {
+		// Constants and variables come in groups, and valueDoc prints
+		// all the items in the group. We only need to find one exported symbol.
+		for _, name := range value.Names {
+			if isExported(name) && !pkg.typedValue[value] {
+				printHdr("VARIABLES")
+				pkg.valueDoc(value, printed)
+				break
+			}
+		}
+	}
+
+	// Functions.
+	for _, fun := range pkg.doc.Funcs {
+		if isExported(fun.Name) && !pkg.constructor[fun] {
+			printHdr("FUNCTIONS")
+			pkg.emit(fun.Doc, fun.Decl)
+		}
+	}
+
+	// Types.
+	for _, typ := range pkg.doc.Types {
+		if isExported(typ.Name) {
+			printHdr("TYPES")
+			pkg.typeDoc(typ)
+		}
+	}
+}
+
 // packageDoc prints the docs for the package (package doc plus one-liners of the rest).
 func (pkg *Package) packageDoc() {
 	defer pkg.flush()
@@ -426,6 +508,10 @@ func (pkg *Package) showInternals() bool {
 // user's argument is identical to the actual package path or
 // is empty, meaning it's the current directory.
 func (pkg *Package) packageClause(checkUserPath bool) {
+	if pkg.packageClausePrinted {
+		return
+	}
+
 	if checkUserPath {
 		if pkg.userPath == "" || pkg.userPath == pkg.build.ImportPath {
 			return
@@ -463,6 +549,7 @@ func (pkg *Package) packageClause(checkUserPath bool) {
 	if !usingModules && importPath != pkg.build.ImportPath {
 		pkg.Printf("WARNING: package source is installed in %q\n", pkg.build.ImportPath)
 	}
+	pkg.packageClausePrinted = true
 }
 
 // valueSummary prints a one-line summary for each set of values and constants.
@@ -497,22 +584,10 @@ func (pkg *Package) valueSummary(values []*doc.Value, showGrouped bool) {
 // funcSummary prints a one-line summary for each function. Constructors
 // are printed by typeSummary, below, and so can be suppressed here.
 func (pkg *Package) funcSummary(funcs []*doc.Func, showConstructors bool) {
-	// First, identify the constructors. Don't bother figuring out if they're exported.
-	var isConstructor map[*doc.Func]bool
-	if !showConstructors {
-		isConstructor = make(map[*doc.Func]bool)
-		for _, typ := range pkg.doc.Types {
-			if isExported(typ.Name) {
-				for _, f := range typ.Funcs {
-					isConstructor[f] = true
-				}
-			}
-		}
-	}
 	for _, fun := range funcs {
 		// Exported functions only. The go/doc package does not include methods here.
 		if isExported(fun.Name) {
-			if !isConstructor[fun] {
+			if showConstructors || !pkg.constructor[fun] {
 				pkg.Printf("%s\n", pkg.oneLineNode(fun.Decl))
 			}
 		}
@@ -629,6 +704,28 @@ func (pkg *Package) symbolDoc(symbol string) bool {
 	// So we remember which declarations we've printed to avoid duplication.
 	printed := make(map[*ast.GenDecl]bool)
 	for _, value := range values {
+		pkg.valueDoc(value, printed)
+		found = true
+	}
+	// Types.
+	for _, typ := range pkg.findTypes(symbol) {
+		pkg.typeDoc(typ)
+		found = true
+	}
+	if !found {
+		// See if there are methods.
+		if !pkg.printMethodDoc("", symbol) {
+			return false
+		}
+	}
+	return true
+}
+
+// valueDoc prints the docs for a constant or variable.
+func (pkg *Package) valueDoc(value *doc.Value, printed map[*ast.GenDecl]bool) {
+	if printed[value.Decl] {
+		return
+	}
 	// Print each spec only if there is at least one exported symbol in it.
 	// (See issue 11008.)
 	// TODO: Should we elide unexported symbols from a single spec?
@@ -662,22 +759,17 @@ func (pkg *Package) symbolDoc(symbol string) bool {
 			}
 		}
 	}
-		if len(specs) == 0 || printed[value.Decl] {
-			continue
+	if len(specs) == 0 {
+		return
 	}
 	value.Decl.Specs = specs
-		if !found {
-			pkg.packageClause(true)
-		}
 	pkg.emit(value.Doc, value.Decl)
 	printed[value.Decl] = true
-		found = true
-	}
-	// Types.
-	for _, typ := range pkg.findTypes(symbol) {
-		if !found {
-			pkg.packageClause(true)
-		}
+}
+
+// typeDoc prints the docs for a type, including constructors and other items
+// related to it.
+func (pkg *Package) typeDoc(typ *doc.Type) {
 	decl := typ.Decl
 	spec := pkg.findTypeSpec(decl, typ.Name)
 	trimUnexportedElems(spec)
@@ -686,23 +778,34 @@ func (pkg *Package) symbolDoc(symbol string) bool {
 		decl.Specs = []ast.Spec{spec}
 	}
 	pkg.emit(typ.Doc, decl)
+	pkg.newlines(2)
 	// Show associated methods, constants, etc.
-		if len(typ.Consts) > 0 || len(typ.Vars) > 0 || len(typ.Funcs) > 0 || len(typ.Methods) > 0 {
-			pkg.Printf("\n")
+	if showAll {
+		printed := make(map[*ast.GenDecl]bool)
+		// We can use append here to print consts, then vars. Ditto for funcs and methods.
+		values := typ.Consts
+		values = append(values, typ.Vars...)
+		for _, value := range values {
+			for _, name := range value.Names {
+				if isExported(name) {
+					pkg.valueDoc(value, printed)
+					break
 				}
+			}
+		}
+		funcs := typ.Funcs
+		funcs = append(funcs, typ.Methods...)
+		for _, fun := range funcs {
+			if isExported(fun.Name) {
+				pkg.emit(fun.Doc, fun.Decl)
+			}
+		}
+	} else {
 		pkg.valueSummary(typ.Consts, true)
 		pkg.valueSummary(typ.Vars, true)
 		pkg.funcSummary(typ.Funcs, true)
 		pkg.funcSummary(typ.Methods, true)
-		found = true
-	}
-	if !found {
-		// See if there are methods.
-		if !pkg.printMethodDoc("", symbol) {
-			return false
-		}
 	}
-	return true
 }
 
 // trimUnexportedElems modifies spec in place to elide unexported fields from

src/cmd/go/alldocs.go

@@ -342,6 +342,8 @@
 // 	cd go/src/encoding/json; go doc decode
 //
 // Flags:
+// 	-all
+// 		Show all the documentation for the package.
 // 	-c
 // 		Respect case when matching symbols.
 // 	-cmd

src/cmd/go/internal/doc/doc.go

@@ -106,6 +106,8 @@ Examples:
 	cd go/src/encoding/json; go doc decode
 
 Flags:
+	-all
+		Show all the documentation for the package.
 	-c
 		Respect case when matching symbols.
 	-cmd