cmd/go/internal/modload: remove unused functions

Also unexport functions that are not used outside the modload package.

Change-Id: I0de187cbb673cadafce95a27f5ccff934ae21104
Reviewed-on: https://go-review.googlesource.com/c/go/+/332570
Trust: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>

Author: Bryan C. Mills

src/cmd/go/internal/modload/load.go

@@ -675,20 +675,6 @@ func DirImportPath(ctx context.Context, dir string) string {
 	return "."
 }
 
-// TargetPackages returns the list of packages in the target (top-level) module
-// matching pattern, which may be relative to the working directory, under all
-// build tag settings.
-func TargetPackages(ctx context.Context, pattern string) *search.Match {
-	// TargetPackages is relative to the main module, so ensure that the main
-	// module is a thing that can contain packages.
-	LoadModFile(ctx) // Sets Target.
-	ModRoot()        // Emits an error if Target cannot contain packages.
-
-	m := search.NewMatch(pattern)
-	matchPackages(ctx, m, imports.AnyTags(), omitStd, []module.Version{Target})
-	return m
-}
-
 // ImportMap returns the actual package import path
 // for an import path found in source code.
 // If the given import path does not appear in the source code
@@ -720,29 +706,6 @@ func PackageModule(path string) module.Version {
 	return pkg.mod
 }
 
-// PackageImports returns the imports for the package named by the import path.
-// Test imports will be returned as well if tests were loaded for the package
-// (i.e., if "all" was loaded or if LoadTests was set and the path was matched
-// by a command line argument). PackageImports will return nil for
-// unknown package paths.
-func PackageImports(path string) (imports, testImports []string) {
-	pkg, ok := loaded.pkgCache.Get(path).(*loadPkg)
-	if !ok {
-		return nil, nil
-	}
-	imports = make([]string, len(pkg.imports))
-	for i, p := range pkg.imports {
-		imports[i] = p.path
-	}
-	if pkg.test != nil {
-		testImports = make([]string, len(pkg.test.imports))
-		for i, p := range pkg.test.imports {
-			testImports[i] = p.path
-		}
-	}
-	return imports, testImports
-}
-
 // Lookup returns the source directory, import path, and any loading error for
 // the package at path as imported from the package in parentDir.
 // Lookup requires that one of the Load functions in this package has already

src/cmd/go/internal/modload/query.go

@@ -920,8 +920,8 @@ func (e *PackageNotInModuleError) ImportPath() string {
 	return ""
 }
 
-// ModuleHasRootPackage returns whether module m contains a package m.Path.
-func ModuleHasRootPackage(ctx context.Context, m module.Version) (bool, error) {
+// moduleHasRootPackage returns whether module m contains a package m.Path.
+func moduleHasRootPackage(ctx context.Context, m module.Version) (bool, error) {
 	needSum := false
 	root, isLocal, err := fetch(ctx, m, needSum)
 	if err != nil {