436 lines
10 KiB
Go
436 lines
10 KiB
Go
package imports
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import (
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"bytes"
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"errors"
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"fmt"
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"go/ast"
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"go/parser"
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"go/printer"
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"go/token"
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"log"
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"os"
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"path/filepath"
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"strings"
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"sync"
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"golang.org/x/mod/modfile"
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"golang.org/x/tools/go/packages"
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)
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const (
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// Use for group imports
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stdImport = "std"
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thirdPartyImport = "third-party"
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companyImport = "company"
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localImport = "local"
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)
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var (
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ErrEmptyPaths = errors.New("empty paths")
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ErrNotGoFile = errors.New("not go file")
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ErrGoGeneratedFile = errors.New("go generated file")
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ErrGoModNotExist = errors.New("go mod not exist")
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ErrGoModEmptyModule = errors.New("go mod empty module")
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)
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// stdPackages -> save std packages for later search
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// moduleNames -> map path to its go.mod module name
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// formattedPaths -> make sure we not format path more than 1 time
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type Formatter struct {
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stdPackages map[string]struct{}
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moduleNames map[string]string
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formattedPaths map[string]struct{}
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companyPrefix string
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muModuleNames sync.RWMutex
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muFormattedPaths sync.RWMutex
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isList bool
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isWrite bool
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isDiff bool
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isVerbose bool
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}
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func NewFormmater(opts ...FormatterOptionFn) (*Formatter, error) {
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ft := &Formatter{}
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for _, opt := range opts {
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opt(ft)
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}
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stdPackages, err := packages.Load(nil, "std")
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if err != nil {
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return nil, fmt.Errorf("packages: failed to load std: %w", err)
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}
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ft.stdPackages = make(map[string]struct{})
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for _, stdPackage := range stdPackages {
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ft.stdPackages[stdPackage.PkgPath] = struct{}{}
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}
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// ft.log("NewFormmater: stdPackages: %+v\n", ft.stdPackages)
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ft.moduleNames = make(map[string]string)
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ft.formattedPaths = make(map[string]struct{})
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return ft, nil
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}
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// Accept a list of files or directories
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func (ft *Formatter) Format(paths ...string) error {
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if len(paths) == 0 {
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return ErrEmptyPaths
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}
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// Logic switch case copy from goimports, gofumpt
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for _, path := range paths {
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path = strings.TrimSpace(path)
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if path == "" {
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continue
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}
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switch dir, err := os.Stat(path); {
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case err != nil:
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return fmt.Errorf("os: failed to stat: [%s] %w", path, err)
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case dir.IsDir():
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if err := ft.formatDir(path); err != nil {
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return err
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}
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default:
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if err := ft.formatFile(path); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func (ft *Formatter) formatDir(path string) error {
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return nil
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}
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func (ft *Formatter) formatFile(path string) error {
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ft.muFormattedPaths.RLock()
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if _, ok := ft.formattedPaths[path]; ok {
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ft.muFormattedPaths.RUnlock()
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return nil
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}
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ft.muFormattedPaths.RUnlock()
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// Return if not go file
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if !isGoFile(filepath.Base(path)) {
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return ErrNotGoFile
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}
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// Read file first
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pathBytes, err := os.ReadFile(path)
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if err != nil {
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return fmt.Errorf("os: failed to read file: [%s] %w", path, err)
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}
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// Get module name of path
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moduleName, err := ft.moduleName(path)
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if err != nil {
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return err
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}
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ft.log("formatFile: moduleName: %+v\n", moduleName)
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if err := ft.formatImports(path, pathBytes, moduleName); err != nil {
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return err
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}
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ft.muFormattedPaths.Lock()
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ft.formattedPaths[path] = struct{}{}
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ft.muFormattedPaths.Unlock()
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return nil
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}
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// Copy from goimports-reviser
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func (ft *Formatter) formatImports(
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path string,
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pathBytes []byte,
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moduleName string,
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) error {
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// Parse ast
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fset := token.NewFileSet()
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parserMode := parser.Mode(0)
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parserMode |= parser.ParseComments
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astFile, err := parser.ParseFile(fset, path, pathBytes, parserMode)
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if err != nil {
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return fmt.Errorf("parser: failed to parse file [%s]: %w", path, err)
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}
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// Ignore generated file
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if isGoGenerated(astFile) {
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return ErrGoGeneratedFile
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}
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// Extract imports
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importSpecs := make([]ast.Spec, 0, len(astFile.Imports))
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for _, importSpec := range astFile.Imports {
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if importSpec.Path.Value == "" {
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continue
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}
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ft.log("formatImports: importSpec: %+v %+v\n", importSpec.Name.String(), importSpec.Path.Value)
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importSpecs = append(importSpecs, importSpec)
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}
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groupedImportSpecs, err := ft.groupImportSpecs(importSpecs, moduleName)
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if err != nil {
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return err
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}
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formattedImportSpecs, err := ft.formatImportSpecs(
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importSpecs,
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groupedImportSpecs,
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)
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if err != nil {
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return err
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}
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ft.mustLogImportSpecs("formatImports: formattedImportSpecs: ", formattedImportSpecs)
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// Combine multi import decl into one
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isExistFirstImportDecl := false
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decls := make([]ast.Decl, 0, len(astFile.Decls))
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for _, decl := range astFile.Decls {
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genDecl, ok := decl.(*ast.GenDecl)
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if !ok {
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decls = append(decls, decl)
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continue
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}
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if genDecl.Tok != token.IMPORT {
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decls = append(decls, decl)
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continue
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}
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if isExistFirstImportDecl {
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continue
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}
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// First import decl take all
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isExistFirstImportDecl = true
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genDecl.Specs = formattedImportSpecs
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decls = append(decls, genDecl)
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}
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// Update ast decls
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astFile.Decls = decls
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// Print formatted bytes from formatted ast
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var formattedBytes []byte
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formattedBuffer := bytes.NewBuffer(formattedBytes)
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if err := printer.Fprint(formattedBuffer, fset, astFile); err != nil {
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return err
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}
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fmt.Println(formattedBuffer.String())
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return nil
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}
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// Copy from goimports-reviser
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// Group imports to std, third-party, company if exist, local
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func (ft *Formatter) groupImportSpecs(
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importSpecs []ast.Spec,
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moduleName string,
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) (map[string][]*ast.ImportSpec, error) {
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result := make(map[string][]*ast.ImportSpec)
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result[stdImport] = make([]*ast.ImportSpec, 0, 8)
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result[thirdPartyImport] = make([]*ast.ImportSpec, 0, 8)
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if ft.companyPrefix != "" {
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result[companyImport] = make([]*ast.ImportSpec, 0, 8)
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}
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result[localImport] = make([]*ast.ImportSpec, 0, 8)
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for _, importSpec := range importSpecs {
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importSpec, ok := importSpec.(*ast.ImportSpec)
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if !ok {
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continue
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}
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// "github.com/abc/xyz" -> github.com/abc/xyz
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importPath := strings.Trim(importSpec.Path.Value, "\"")
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if _, ok := ft.stdPackages[importPath]; ok {
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result[stdImport] = append(result[stdImport], importSpec)
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continue
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}
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if strings.HasPrefix(importPath, moduleName) {
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result[localImport] = append(result[localImport], importSpec)
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continue
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}
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if ft.companyPrefix != "" &&
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strings.HasPrefix(importPath, ft.companyPrefix) {
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result[companyImport] = append(result[companyImport], importSpec)
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continue
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}
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result[thirdPartyImport] = append(result[thirdPartyImport], importSpec)
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}
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ft.logImportSpecs("stdImport", result[stdImport])
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ft.logImportSpecs("thirdPartyImport", result[thirdPartyImport])
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if ft.companyPrefix != "" {
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ft.logImportSpecs("companyImport", result[companyImport])
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}
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ft.logImportSpecs("localImport", result[localImport])
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return result, nil
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}
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// Copy from goimports-reviser
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func (ft *Formatter) formatImportSpecs(
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importSpecs []ast.Spec,
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groupedImportSpecs map[string][]*ast.ImportSpec,
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) ([]ast.Spec, error) {
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result := make([]ast.Spec, 0, len(importSpecs))
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if stdImportSpecs, ok := groupedImportSpecs[stdImport]; ok && len(stdImportSpecs) != 0 {
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for _, importSpec := range stdImportSpecs {
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result = append(result, importSpec)
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}
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}
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if thirdPartImportSpecs, ok := groupedImportSpecs[thirdPartyImport]; ok && len(thirdPartImportSpecs) != 0 {
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if len(result) != 0 {
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result = append(result, &ast.ImportSpec{
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Path: &ast.BasicLit{
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Value: "",
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Kind: token.STRING,
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},
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})
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}
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for _, importSpec := range thirdPartImportSpecs {
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result = append(result, importSpec)
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}
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}
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if ft.companyPrefix != "" {
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if companyImportSpecs, ok := groupedImportSpecs[companyImport]; ok && len(companyImportSpecs) != 0 {
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if len(result) != 0 {
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result = append(result, &ast.ImportSpec{
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Path: &ast.BasicLit{
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Value: "",
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Kind: token.STRING,
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},
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})
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}
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for _, importSpec := range companyImportSpecs {
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result = append(result, importSpec)
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}
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}
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}
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if localImportSpecs, ok := groupedImportSpecs[localImport]; ok && len(localImportSpecs) != 0 {
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if len(result) != 0 {
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result = append(result, &ast.ImportSpec{
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Path: &ast.BasicLit{
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Value: "",
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Kind: token.STRING,
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},
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})
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}
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for _, importSpec := range localImportSpecs {
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result = append(result, importSpec)
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}
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}
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return result, nil
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}
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// Copy from goimports-reviser
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func (ft *Formatter) moduleName(path string) (string, error) {
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ft.muModuleNames.RLock()
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if pkgName, ok := ft.moduleNames[path]; ok {
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ft.muModuleNames.RUnlock()
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return pkgName, nil
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}
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ft.muModuleNames.RUnlock()
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// Copy from goimports-reviser
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// Check path/go.mod first
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// If not exist -> check ../go.mod
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// Assume path is dir path, maybe wrong but it is ok for now
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dirPath := filepath.Clean(path)
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var goModPath string
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for {
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goModPath = filepath.Join(dirPath, "go.mod")
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fileInfo, err := os.Stat(goModPath)
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if err == nil && !fileInfo.IsDir() {
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break
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}
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// Check ..
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if dirPath == filepath.Dir(dirPath) {
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// Reach root
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break
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}
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dirPath = filepath.Dir(dirPath)
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}
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if goModPath == "" {
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return "", ErrGoModNotExist
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}
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ft.log("moduleName: goModPath: %+v\n", goModPath)
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goModPathBytes, err := os.ReadFile(goModPath)
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if err != nil {
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return "", fmt.Errorf("os: failed to read file: [%s] %w", goModPath, err)
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}
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goModFile, err := modfile.Parse(goModPath, goModPathBytes, nil)
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if err != nil {
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return "", fmt.Errorf("modfile: failed to parse: [%s] %w", goModPath, err)
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}
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result := goModFile.Module.Mod.Path
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if result == "" {
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return "", ErrGoModEmptyModule
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}
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ft.muModuleNames.Lock()
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ft.moduleNames[path] = result
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ft.muModuleNames.Unlock()
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return result, nil
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}
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// Wrap log.Printf with verbose flag
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func (ft *Formatter) log(format string, v ...any) {
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if ft.isVerbose {
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log.Printf(format, v...)
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}
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}
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func (ft *Formatter) logImportSpecs(logPrefix string, importSpecs []*ast.ImportSpec) {
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if ft.isVerbose {
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for _, importSpec := range importSpecs {
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log.Printf("%s: importSpec: %+v %+v\n", logPrefix, importSpec.Name.String(), importSpec.Path.Value)
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}
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}
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}
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func (ft *Formatter) mustLogImportSpecs(logPrefix string, importSpecs []ast.Spec) {
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if ft.isVerbose {
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for _, importSpec := range importSpecs {
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importSpec, ok := importSpec.(*ast.ImportSpec)
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if !ok {
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continue
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}
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log.Printf("%s: importSpec: %+v %+v\n", logPrefix, importSpec.Name.String(), importSpec.Path.Value)
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}
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}
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}
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