A better go code formatter, and now make fmt can run in Windows

Makefile

@@ -58,8 +58,6 @@ else
 	SED_INPLACE := sed -i ''
 endif
 
-GOFMT ?= gofmt -s
-
 EXTRA_GOFLAGS ?=
 
 MAKE_VERSION := $(shell $(MAKE) -v | head -n 1)
@@ -127,8 +125,6 @@ ifeq ($(filter $(TAGS_SPLIT),bindata),bindata)
 	GO_SOURCES += $(BINDATA_DEST)
 endif
 
-GO_SOURCES_OWN := $(filter-out vendor/% %/bindata.go, $(GO_SOURCES))
-
 #To update swagger use: GO111MODULE=on go get -u github.com/go-swagger/go-swagger/cmd/swagger
 SWAGGER := $(GO) run -mod=vendor github.com/go-swagger/go-swagger/cmd/swagger
 SWAGGER_SPEC := templates/swagger/v1_json.tmpl
@@ -238,7 +234,7 @@ clean:
 .PHONY: fmt
 fmt:
 	@echo "Running go fmt..."
-	@$(GOFMT) -w $(GO_SOURCES_OWN)
+	@$(GO) run build/code-batch-process.go gitea-fmt -s -w '{file-list}'
 
 .PHONY: vet
 vet:
@@ -298,20 +294,20 @@ misspell-check:
 		$(GO) install github.com/client9/misspell/cmd/misspell@v0.3.4; \
 	fi
 	@echo "Running misspell-check..."
-	@misspell -error -i unknwon $(GO_SOURCES_OWN)
+	@$(GO) run build/code-batch-process.go misspell -error -i unknwon '{file-list}'
 
 .PHONY: misspell
 misspell:
 	@hash misspell > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
 		$(GO) install github.com/client9/misspell/cmd/misspell@v0.3.4; \
 	fi
 	@echo "Running go misspell..."
-	@misspell -w -i unknwon $(GO_SOURCES_OWN)
+	@$(GO) run build/code-batch-process.go misspell -w -i unknwon '{file-list}'
 
 .PHONY: fmt-check
 fmt-check:
 	# get all go files and run go fmt on them
-	@diff=$$($(GOFMT) -d $(GO_SOURCES_OWN)); \
+	@diff=$$($(GO) run build/code-batch-process.go gitea-fmt -s -d '{file-list}'); \
 	if [ -n "$$diff" ]; then \
 		echo "Please run 'make fmt' and commit the result:"; \
 		echo "$${diff}"; \

build/code-batch-process.go

@@ -0,0 +1,284 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+//go:build ignore
+// +build ignore
+
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"regexp"
+	"strconv"
+	"strings"
+
+	"code.gitea.io/gitea/build/codeformat"
+)
+
+// Windows has a limitation for command line arguments, the size can not exceed 32KB.
+// So we have to feed the files to some tools (like gofmt/misspell`) batch by batch
+
+// We also introduce a `gitea-fmt` command, it does better import formatting than gofmt/goimports
+
+var optionLogVerbose bool
+
+func logVerbose(msg string, args ...interface{}) {
+	if optionLogVerbose {
+		log.Printf(msg, args...)
+	}
+}
+
+func passThroughCmd(cmd string, args []string) error {
+	foundCmd, err := exec.LookPath(cmd)
+	if err != nil {
+		log.Fatalf("can not find cmd: %s", cmd)
+	}
+	c := exec.Cmd{
+		Path:   foundCmd,
+		Args:   args,
+		Stdin:  os.Stdin,
+		Stdout: os.Stdout,
+		Stderr: os.Stderr,
+	}
+	return c.Run()
+}
+
+type fileCollector struct {
+	dirs            []string
+	includePatterns []*regexp.Regexp
+	excludePatterns []*regexp.Regexp
+	batchSize       int
+}
+
+func newFileCollector(fileFilter string, batchSize int) (*fileCollector, error) {
+	co := &fileCollector{batchSize: batchSize}
+	if fileFilter == "go-own" {
+		co.dirs = []string{
+			"build",
+			"cmd",
+			"contrib",
+			"integrations",
+			"models",
+			"modules",
+			"routers",
+			"services",
+			"tools",
+		}
+		co.includePatterns = append(co.includePatterns, regexp.MustCompile(`.*\.go$`))
+
+		co.excludePatterns = append(co.excludePatterns, regexp.MustCompile(`.*\bbindata\.go$`))
+		co.excludePatterns = append(co.excludePatterns, regexp.MustCompile(`integrations/gitea-repositories-meta`))
+		co.excludePatterns = append(co.excludePatterns, regexp.MustCompile(`integrations/migration-test`))
+		co.excludePatterns = append(co.excludePatterns, regexp.MustCompile(`modules/git/tests`))
+		co.excludePatterns = append(co.excludePatterns, regexp.MustCompile(`models/fixtures`))
+		co.excludePatterns = append(co.excludePatterns, regexp.MustCompile(`models/migrations/fixtures`))
+		co.excludePatterns = append(co.excludePatterns, regexp.MustCompile(`services/gitdiff/testdata`))
+	}
+
+	if co.dirs == nil {
+		return nil, fmt.Errorf("unknown file-filter: %s", fileFilter)
+	}
+	return co, nil
+}
+
+func (fc *fileCollector) matchPatterns(path string, regexps []*regexp.Regexp) bool {
+	path = strings.ReplaceAll(path, "\\", "/")
+	for _, re := range regexps {
+		if re.MatchString(path) {
+			return true
+		}
+	}
+	return false
+}
+
+func (fc *fileCollector) collectFiles() (res [][]string, err error) {
+	var batch []string
+	for _, dir := range fc.dirs {
+		err = filepath.WalkDir(dir, func(path string, d os.DirEntry, err error) error {
+			include := len(fc.includePatterns) == 0 || fc.matchPatterns(path, fc.includePatterns)
+			exclude := fc.matchPatterns(path, fc.excludePatterns)
+			process := include && !exclude
+			if !process {
+				if d.IsDir() {
+					if exclude {
+						logVerbose("exclude dir %s", path)
+						return filepath.SkipDir
+					}
+					// for a directory, if it is not excluded explicitly, we should walk into
+					return nil
+				}
+				// for a file, we skip it if it shouldn't be processed
+				logVerbose("skip process %s", path)
+				return nil
+			}
+			if d.IsDir() {
+				// skip dir, we don't add dirs to the file list now
+				return nil
+			}
+			if len(batch) >= fc.batchSize {
+				res = append(res, batch)
+				batch = nil
+			}
+			batch = append(batch, path)
+			return nil
+		})
+		if err != nil {
+			return nil, err
+		}
+	}
+	res = append(res, batch)
+	return res, nil
+}
+
+// substArgFiles expands the {file-list} to a real file list for commands
+func substArgFiles(args []string, files []string) []string {
+	for i, s := range args {
+		if s == "{file-list}" {
+			newArgs := append(args[:i], files...)
+			newArgs = append(newArgs, args[i+1:]...)
+			return newArgs
+		}
+	}
+	return args
+}
+
+func exitWithCmdErrors(subCmd string, subArgs []string, cmdErrors []error) {
+	for _, err := range cmdErrors {
+		if err != nil {
+			if exitError, ok := err.(*exec.ExitError); ok {
+				exitCode := exitError.ExitCode()
+				log.Printf("run command failed (code=%d): %s %v", exitCode, subCmd, subArgs)
+				os.Exit(exitCode)
+			} else {
+				log.Fatalf("run command failed (err=%s) %s %v", err, subCmd, subArgs)
+			}
+		}
+	}
+}
+
+func parseArgs() (mainOptions map[string]string, subCmd string, subArgs []string) {
+	mainOptions = map[string]string{}
+	for i := 1; i < len(os.Args); i++ {
+		arg := os.Args[i]
+		if arg == "" {
+			break
+		}
+		if arg[0] == '-' {
+			arg = strings.TrimPrefix(arg, "-")
+			arg = strings.TrimPrefix(arg, "-")
+			fields := strings.SplitN(arg, "=", 2)
+			if len(fields) == 1 {
+				mainOptions[fields[0]] = "1"
+			} else {
+				mainOptions[fields[0]] = fields[1]
+			}
+		} else {
+			subCmd = arg
+			subArgs = os.Args[i+1:]
+			break
+		}
+	}
+	return
+}
+
+func showUsage() {
+	fmt.Printf(`Usage: %[1]s [options] {command} [arguments]
+
+Options:
+  --verbose
+  --file-filter=go-own
+  --batch-size=100
+
+Commands:
+  %[1]s gofmt ...
+  %[1]s misspell ...
+
+Arguments:
+  {file-list}     the file list
+
+Example:
+  %[1]s gofmt -s -d {file-list}
+
+`, "file-batch-exec")
+}
+
+func newFileCollectorFromMainOptions(mainOptions map[string]string) (fc *fileCollector, err error) {
+	fileFilter := mainOptions["file-filter"]
+	if fileFilter == "" {
+		fileFilter = "go-own"
+	}
+	batchSize, _ := strconv.Atoi(mainOptions["batch-size"])
+	if batchSize == 0 {
+		batchSize = 100
+	}
+
+	return newFileCollector(fileFilter, batchSize)
+}
+
+func containsString(a []string, s string) bool {
+	for _, v := range a {
+		if v == s {
+			return true
+		}
+	}
+	return false
+}
+
+func giteaFormatGoImports(files []string) error {
+	for _, file := range files {
+		if err := codeformat.FormatGoImports(file); err != nil {
+			log.Printf("failed to format go imports: %s, err=%v", file, err)
+			return err
+		}
+	}
+	return nil
+}
+
+func main() {
+	mainOptions, subCmd, subArgs := parseArgs()
+	if subCmd == "" {
+		showUsage()
+		os.Exit(1)
+	}
+	optionLogVerbose = mainOptions["verbose"] != ""
+
+	fc, err := newFileCollectorFromMainOptions(mainOptions)
+	if err != nil {
+		log.Fatalf("can not create file collector: %s", err.Error())
+	}
+
+	fileBatches, err := fc.collectFiles()
+	if err != nil {
+		log.Fatalf("can not collect files: %s", err.Error())
+	}
+
+	processed := 0
+	var cmdErrors []error
+	for _, files := range fileBatches {
+		if len(files) == 0 {
+			break
+		}
+		substArgs := substArgFiles(subArgs, files)
+		logVerbose("batch cmd: %s %v", subCmd, substArgs)
+		switch subCmd {
+		case "gitea-fmt":
+			cmdErrors = append(cmdErrors, passThroughCmd("gofmt", substArgs))
+			if containsString(subArgs, "-w") {
+				cmdErrors = append(cmdErrors, giteaFormatGoImports(files))
+			}
+		case "misspell":
+			cmdErrors = append(cmdErrors, passThroughCmd("misspell", substArgs))
+		default:
+			log.Fatalf("unknown cmd: %s %v", subCmd, subArgs)
+		}
+		processed += len(files)
+	}
+
+	logVerbose("processed %d files", processed)
+	exitWithCmdErrors(subCmd, subArgs, cmdErrors)
+}