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Copy pathmain.go
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876 lines (807 loc) · 21.8 KB
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package main
import (
"bufio"
"fmt"
"io"
"io/ioutil"
"log"
"net/url"
"os"
"os/signal"
"path/filepath"
"regexp"
"runtime"
"runtime/pprof"
"sort"
"strings"
"time"
"github.com/djherbis/atime"
humanize "github.com/dustin/go-humanize"
"github.com/matryer/try"
flag "github.com/spf13/pflag"
min "github.com/tdewolff/minify/v2"
"github.com/tdewolff/minify/v2/css"
"github.com/tdewolff/minify/v2/html"
"github.com/tdewolff/minify/v2/js"
"github.com/tdewolff/minify/v2/json"
"github.com/tdewolff/minify/v2/svg"
"github.com/tdewolff/minify/v2/xml"
)
// Version is the current minify version.
var Version = "built from source"
var filetypeMime = map[string]string{
"css": "text/css",
"htm": "text/html",
"html": "text/html",
"js": "application/javascript",
"json": "application/json",
"svg": "image/svg+xml",
"xml": "text/xml",
}
var (
help bool
hidden bool
list bool
m *min.M
pattern *regexp.Regexp
recursive bool
verbose bool
version bool
watch bool
sync bool
bundle bool
preserve []string
preserveMode bool
preserveOwnership bool
preserveTimestamps bool
preserveLinks bool
mimetype string
)
// Task is a minify task.
type Task struct {
srcs []string
dst string
sync bool
}
// NewTask returns a new Task.
func NewTask(root, input, output string, sync bool) (Task, error) {
t := Task{[]string{input}, output, sync}
if 0 < len(output) && output[len(output)-1] == '/' {
rel, err := filepath.Rel(root, input)
if err != nil {
return Task{}, err
}
t.dst = filepath.Join(output, rel)
}
return t, nil
}
// Loggers.
var (
Error *log.Logger
Warning *log.Logger
Info *log.Logger
)
func main() {
// os.Exit doesn't execute pending defer calls, this is fixed by encapsulating run()
os.Exit(run())
}
func run() int {
output := ""
filetype := ""
match := ""
siteurl := ""
cpuprofile := ""
memprofile := ""
cssMinifier := &css.Minifier{}
htmlMinifier := &html.Minifier{}
jsMinifier := &js.Minifier{}
jsonMinifier := &json.Minifier{}
svgMinifier := &svg.Minifier{}
xmlMinifier := &xml.Minifier{}
flag := flag.NewFlagSet("minify", flag.ContinueOnError)
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage: %s [options] [input]\n\nOptions:\n", os.Args[0])
flag.PrintDefaults()
fmt.Fprintf(os.Stderr, "\nInput:\n Files or directories, leave blank to use stdin. Specify --mime or --type to use stdin and stdout.\n")
}
flag.BoolVarP(&help, "help", "h", false, "Show usage")
flag.StringVarP(&output, "output", "o", "", "Output file or directory (must have trailing slash), leave blank to use stdout")
flag.StringVar(&mimetype, "mime", "", "Mimetype (eg. text/css), optional for input filenames, has precedence over --type")
flag.StringVar(&filetype, "type", "", "Filetype (eg. css), optional for input filenames")
flag.StringVar(&match, "match", "", "Filename pattern matching using regular expressions")
flag.BoolVarP(&recursive, "recursive", "r", false, "Recursively minify directories")
flag.BoolVarP(&hidden, "all", "a", false, "Minify all files, including hidden files and files in hidden directories")
flag.BoolVarP(&list, "list", "l", false, "List all accepted filetypes")
flag.BoolVarP(&verbose, "verbose", "v", false, "Verbose")
flag.BoolVarP(&watch, "watch", "w", false, "Watch files and minify upon changes")
flag.BoolVarP(&sync, "sync", "s", false, "Copy all files to destination directory and minify when filetype matches")
flag.StringSliceVarP(&preserve, "preserve", "p", nil, "Preserve options (mode, ownership, timestamps, links)")
flag.Lookup("preserve").NoOptDefVal = "mode,ownership,timestamps"
flag.BoolVar(&preserveLinks, "preserve-links", false, "Copy symbolic links without dereferencing and without minifying the referenced file (only with --sync)")
flag.BoolVarP(&bundle, "bundle", "b", false, "Bundle files by concatenation into a single file")
flag.BoolVar(&version, "version", false, "Version")
flag.StringVar(&siteurl, "url", "", "URL of file to enable URL minification")
flag.StringVar(&cpuprofile, "cpuprofile", "", "Export CPU profile")
flag.StringVar(&memprofile, "memprofile", "", "Export memory profile")
flag.IntVar(&cssMinifier.Precision, "css-precision", 0, "Number of significant digits to preserve in numbers, 0 is all")
flag.BoolVar(&htmlMinifier.KeepComments, "html-keep-comments", false, "Preserve all comments")
flag.BoolVar(&htmlMinifier.KeepConditionalComments, "html-keep-conditional-comments", false, "Preserve all IE conditional comments")
flag.BoolVar(&htmlMinifier.KeepDefaultAttrVals, "html-keep-default-attrvals", false, "Preserve default attribute values")
flag.BoolVar(&htmlMinifier.KeepDocumentTags, "html-keep-document-tags", false, "Preserve html, head and body tags")
flag.BoolVar(&htmlMinifier.KeepEndTags, "html-keep-end-tags", false, "Preserve all end tags")
flag.BoolVar(&htmlMinifier.KeepWhitespace, "html-keep-whitespace", false, "Preserve whitespace characters but still collapse multiple into one")
flag.BoolVar(&htmlMinifier.KeepQuotes, "html-keep-quotes", false, "Preserve quotes around attribute values")
flag.IntVar(&jsMinifier.Precision, "js-precision", 0, "Number of significant digits to preserve in numbers, 0 is all")
flag.BoolVar(&jsMinifier.KeepVarNames, "js-keep-var-names", false, "Preserve original variable names")
flag.IntVar(&jsonMinifier.Precision, "json-precision", 0, "Number of significant digits to preserve in numbers, 0 is all")
flag.BoolVar(&jsonMinifier.KeepNumbers, "json-keep-numbers", false, "Preserve original numbers instead of minifying them")
flag.IntVar(&svgMinifier.Precision, "svg-precision", 0, "Number of significant digits to preserve in numbers, 0 is all")
flag.BoolVar(&xmlMinifier.KeepWhitespace, "xml-keep-whitespace", false, "Preserve whitespace characters but still collapse multiple into one")
if len(os.Args) == 1 {
fmt.Printf("minify: must specify --mime or --type in order to use stdin and stdout\n")
fmt.Printf("Try 'minify --help' for more information\n")
return 1
} else if err := flag.Parse(os.Args[1:]); err != nil {
fmt.Printf("minify: %v\n", err)
fmt.Printf("Try 'minify --help' for more information\n")
return 1
}
inputs := flag.Args()
useStdin := len(inputs) == 0
Error = log.New(os.Stderr, "ERROR: ", 0)
Warning = log.New(os.Stderr, "WARNING: ", 0)
if verbose {
Info = log.New(os.Stderr, "", 0)
} else {
Info = log.New(ioutil.Discard, "", 0)
}
if preserveLinks {
Warning.Println(fmt.Errorf("--preserveLinks is deprecated, use --preserve=links instead"))
}
if help {
flag.Usage()
return 0
}
if version {
fmt.Printf("minify %s\n", Version)
return 0
}
if list {
var keys []string
for k := range filetypeMime {
keys = append(keys, k)
}
sort.Strings(keys)
for _, k := range keys {
fmt.Println(k + "\t" + filetypeMime[k])
}
return 0
}
if cpuprofile != "" {
f, err := os.Create(cpuprofile)
if err != nil {
Error.Println(err)
return 1
}
if err = pprof.StartCPUProfile(f); err != nil {
Error.Println(err)
return 1
}
defer func() {
pprof.StopCPUProfile()
if err = f.Close(); err != nil {
Error.Println(err)
}
}()
}
if memprofile != "" {
defer func() {
f, err := os.Create(memprofile)
if err != nil {
Error.Println(err)
}
if err = pprof.WriteHeapProfile(f); err != nil {
Error.Println(err)
}
if err = f.Close(); err != nil {
Error.Println(err)
}
}()
}
var err error
if match != "" {
pattern, err = regexp.Compile(match)
if err != nil {
Error.Println(err)
return 1
}
}
// detect mimetype, mimetype=="" means we'll infer mimetype from file extensions
if mimetype == "" && filetype != "" {
var ok bool
if mimetype, ok = filetypeMime[filetype]; !ok {
Error.Println("cannot find mimetype for filetype", filetype)
return 1
}
}
if (useStdin || output == "") && (watch || sync || recursive) {
if watch {
Error.Println("--watch doesn't work on stdin and stdout, specify input and output")
}
if sync {
Error.Println("--sync doesn't work on stdin and stdout, specify input and output")
}
if recursive {
Error.Println("--recursive doesn't work on stdin and stdout, specify input and output")
}
return 1
}
if mimetype == "" && useStdin {
Error.Println("must specify --mime or --type for stdin")
return 1
} else if mimetype != "" && sync {
Error.Println("must specify either --sync or --mime/--type")
return 1
}
if verbose {
if mimetype == "" {
Info.Println("infer mimetype from file extensions")
} else {
Info.Println("use mimetype", mimetype)
}
}
if len(preserve) != 0 {
if bundle {
Error.Println("--preserve cannot be used together with --bundle")
return 1
} else if useStdin || output == "" {
Error.Println("--preserve cannot be used together with stdin or stdout")
return 1
}
}
for _, option := range preserve {
switch option {
case "mode":
preserveMode = true
case "ownership":
preserveOwnership = true
case "timestamps":
preserveTimestamps = true
case "links":
preserveLinks = true
}
}
////////////////
for i, input := range inputs {
inputs[i] = filepath.Clean(input)
}
// set output, empty means stdout, ending in slash means a directory, otherwise a file
dirDst := false
if output != "" {
dirDst := output[len(output)-1] == '/'
if !dirDst {
if 1 < len(inputs) && !bundle {
dirDst = true
} else if info, err := os.Lstat(inputs[0]); err == nil && !bundle && info.Mode().IsDir() && info.Mode()&os.ModeSymlink == 0 {
dirDst = true
} else if info, err := os.Lstat(output); err == nil && info.Mode().IsDir() && info.Mode()&os.ModeSymlink == 0 {
dirDst = true
}
}
if dirDst && bundle {
Error.Println("--bundle requires destination to be stdout or a file")
return 1
}
output = filepath.Clean(output)
if dirDst {
output += "/"
}
} else if 1 < len(inputs) {
Error.Println("must specify --bundle for multiple input files with stdout destination")
return 1
}
if verbose {
if output == "" {
Info.Println("minify to stdout")
} else if !dirDst {
Info.Println("minify to output file", output)
} else if output == "./" {
Info.Println("minify to current working directory")
} else {
Info.Println("minify to output directory", output)
}
if useStdin {
Info.Println("minify from stdin")
}
}
if dirDst {
if err := os.MkdirAll(output, 0777); err != nil {
Error.Println(err)
return 1
}
}
var tasks []Task
var roots []string
if useStdin {
task, err := NewTask("", "", output, false)
if err != nil {
Error.Println(err)
return 1
}
tasks = append(tasks, task)
roots = append(roots, "")
} else {
tasks, roots, err = createTasks(inputs, output)
if err != nil {
Error.Println(err)
return 1
}
}
// concatenate
if 1 < len(tasks) && bundle {
// Task.sync == false because dirDst == false
for _, task := range tasks[1:] {
tasks[0].srcs = append(tasks[0].srcs, task.srcs[0])
}
tasks = tasks[:1]
}
////////////////
m = min.New()
m.Add("text/css", cssMinifier)
m.Add("text/html", htmlMinifier)
m.Add("image/svg+xml", svgMinifier)
m.AddRegexp(regexp.MustCompile("^(application|text)/(x-)?(java|ecma)script$"), jsMinifier)
m.AddRegexp(regexp.MustCompile("[/+]json$"), jsonMinifier)
m.AddRegexp(regexp.MustCompile("[/+]xml$"), xmlMinifier)
if m.URL, err = url.Parse(siteurl); err != nil {
Error.Println(err)
return 1
}
numWorkers := 1
if !verbose && len(tasks) > 1 {
numWorkers = 4
if n := runtime.NumCPU(); n > numWorkers {
numWorkers = n
}
}
start := time.Now()
chanTasks := make(chan Task, 100)
chanFails := make(chan int, numWorkers)
for n := 0; n < numWorkers; n++ {
go minifyWorker(chanTasks, chanFails)
}
if !watch {
for _, task := range tasks {
chanTasks <- task
}
} else {
watcher, err := NewWatcher(recursive)
if err != nil {
Error.Println(err)
return 1
}
defer watcher.Close()
changes := watcher.Run()
for _, task := range tasks {
chanTasks <- task
}
autoDir := false
files := roots
if !recursive {
files = inputs
}
for _, filename := range files {
watcher.AddPath(filename)
if filename == output {
autoDir = true
}
}
skip := map[string]bool{}
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
for changes != nil {
select {
case <-c:
watcher.Close()
case file, ok := <-changes:
if !ok {
changes = nil
break
}
file = filepath.Clean(file)
// find longest common path among roots
root := ""
for _, path := range roots {
pathRel, err1 := filepath.Rel(path, file)
rootRel
8BD0
, err2 := filepath.Rel(root, file)
if err2 != nil || err1 == nil && len(pathRel) < len(rootRel) {
root = path
}
}
if autoDir && root == output {
// skip files in output directory (which is also an input directory) for the first change
// skips files that are not minified and stay put as they are not explicitly copied, but that's ok
if _, ok := skip[file]; !ok {
skip[file] = true
break
}
}
if !verbose {
Info.Println(file, "changed")
}
task, err := NewTask(root, file, output, !fileMatches(file))
if err != nil {
Error.Println(err)
return 1
}
chanTasks <- task
}
}
}
fails := 0
close(chanTasks)
for n := 0; n < numWorkers; n++ {
fails += <-chanFails
}
if verbose && !watch {
Info.Println("finished in", time.Since(start))
}
if 0 < fails {
return 1
}
return 0
}
func minifyWorker(chanTasks <-chan Task, chanFails chan<- int) {
fails := 0
for task := range chanTasks {
if ok := minify(task); !ok {
fails++
}
}
chanFails <- fails
}
func fileMatches(filename string) bool {
if pattern != nil && !pattern.MatchString(filename) {
return false
} else if mimetype != "" {
return true
}
ext := filepath.Ext(filename)
if 0 < len(ext) {
ext = ext[1:]
}
if _, ok := filetypeMime[ext]; !ok {
return false
}
return true
}
func createTasks(inputs []string, output string) ([]Task, []string, error) {
tasks := []Task{}
roots := []string{}
for _, input := range inputs {
root := filepath.Dir(input)
var info os.FileInfo
var err error
if !preserveLinks {
info, err = os.Stat(input)
} else {
info, err = os.Lstat(input)
}
if err != nil {
return nil, nil, err
}
if info.Mode()&os.ModeSymlink != 0 {
if !sync {
Warning.Println("--sync not specified, omitting symbolic link", input)
continue
}
task, err := NewTask(root, input, output, true)
if err != nil {
return nil, nil, err
}
tasks = append(tasks, task)
} else if info.Mode().IsRegular() {
valid := pattern == nil || pattern.MatchString(info.Name())
if valid || sync {
task, err := NewTask(root, input, output, !valid)
if err != nil {
return nil, nil, err
}
tasks = append(tasks, task)
}
} else if info.Mode().IsDir() {
if !recursive {
Warning.Println("--recursive not specified, omitting directory", input)
continue
}
roots = append(roots, input)
var walkFn func(string, DirEntry, error) error
walkFn = func(path string, d DirEntry, err error) error {
if err != nil {
return err
} else if d.Name() == "." || d.Name() == ".." {
return nil
} else if d.Name() == "" || !hidden && d.Name()[0] == '.' {
if d.IsDir() {
return SkipDir
}
return nil
}
path = filepath.Clean(path)
if !preserveLinks && d.Type()&os.ModeSymlink != 0 {
// follow and dereference symlinks
info, err := os.Stat(path)
if err != nil {
return err
}
if info.IsDir() {
return WalkDir(DirFS(input), path, walkFn)
}
d = &statDirEntry{info}
}
if preserveLinks && d.Type()&os.ModeSymlink != 0 {
// copy symlinks as is
if !sync {
Warning.Println("--sync not specified, omitting symbolic link", path)
return nil
}
task, err := NewTask(root, path, output, true)
if err != nil {
return err
}
tasks = append(tasks, task)
} else if d.Type().IsRegular() {
valid := fileMatches(d.Name())
if valid || sync {
task, err := NewTask(root, path, output, !valid)
if err != nil {
return err
}
tasks = append(tasks, task)
}
}
return nil
}
if err := WalkDir(DirFS("."), input, walkFn); err != nil {
return nil, nil, err
}
} else {
return nil, nil, fmt.Errorf("not a file or directory %s", input)
}
}
return tasks, roots, nil
}
func openInputFile(input string) (io.ReadCloser, error) {
var r *os.File
if input == "" {
r = os.Stdin
} else {
err := try.Do(func(attempt int) (bool, error) {
var ferr error
r, ferr = os.Open(input)
return attempt < 5, ferr
})
if err != nil {
return nil, err
}
}
return r, nil
}
func openOutputFile(output string) (*os.File, error) {
var w *os.File
if output == "" {
w = os.Stdout
} else {
if err := os.MkdirAll(filepath.Dir(output), 0777); err != nil {
return nil, err
}
err := try.Do(func(attempt int) (bool, error) {
var ferr error
w, ferr = os.OpenFile(output, os.O_WRONLY|os.O_TRUNC|os.O_CREATE, 0666)
return attempt < 5, ferr
})
if err != nil {
return nil, err
}
}
return w, nil
}
func createSymlink(input, output string) error {
if _, err := os.Stat(output); err == nil {
if err = os.Remove(output); err != nil {
return err
}
}
if err := os.MkdirAll(filepath.Dir(output), 0777); err != nil {
return err
}
if err := os.Symlink(input, output); err != nil {
return err
}
return nil
}
func minify(t Task) bool {
// synchronizing files that are not minified but just copied to the same directory, no action needed
if t.sync {
if t.srcs[0] == t.dst {
return true
} else if info, err := os.Lstat(t.srcs[0]); preserveLinks && err == nil && info.Mode()&os.ModeSymlink != 0 {
src, err := os.Readlink(t.srcs[0])
if err != nil {
Error.Println(err)
return false
}
if err := createSymlink(src, t.dst); err != nil {
Error.Println(err)
return false
}
return true
}
}
fileMimetype := mimetype
if mimetype == "" && !t.sync {
for _, src := range t.srcs {
ext := filepath.Ext(src)
if 0 < len(ext) {
ext = ext[1:]
}
srcMimetype, ok := filetypeMime[ext]
if !ok {
Error.Println("cannot infer mimetype from extension in", src, ", set --type or --mime explicitly")
return false
}
if fileMimetype == "" {
fileMimetype = srcMimetype
} else if srcMimetype != fileMimetype {
Error.Println("inferred mimetype", srcMimetype, "of", src, "for concatenation unequal to previous mimetypes, set --type or --mime explicitly")
return false
}
}
}
srcName := strings.Join(t.srcs, " + ")
if len(t.srcs) > 1 {
srcName = "(" + srcName + ")"
}
if srcName == "" {
srcName = "stdin"
}
dstName := t.dst
if dstName == "" {
dstName = "stdout"
} else {
// rename original when overwriting
for i := range t.srcs {
if t.srcs[i] == t.dst {
t.srcs[i] += ".bak"
err := try.Do(func(attempt int) (bool, error) {
ferr := os.Rename(t.dst, t.srcs[i])
return attempt < 5, ferr
})
if err != nil {
Error.Println(err)
return false
}
break
}
}
}
fr, err := newConcatFileReader(t.srcs, openInputFile)
if err != nil {
Error.Println(err)
return false
}
if fileMimetype == filetypeMime["js"] {
fr.SetSeparator([]byte("\n"))
}
fw, err := openOutputFile(t.dst)
if err != nil {
Error.Println(err)
fr.Close()
return false
}
// synchronize file
if t.sync {
_, err = io.Copy(fw, fr)
fr.Close()
fw.Close()
if err != nil {
Error.Println(err)
return false
}
preserveAttributes(t.srcs[0], t.dst)
Info.Println("copy", srcName, "to", dstName)
return true
}
r := newCountingReader(fr)
var w *countingWriter
if fw == os.Stdout {
w = newCountingWriter(fw)
} else {
w = newCountingWriter(bufio.NewWriter(fw))
}
success := true
startTime := time.Now()
if err = m.Minify(fileMimetype, w, r); err != nil {
if t.dst == "" && 0 < w.N {
fmt.Fprintf(os.Stdout, "\n\n")
}
Error.Println("cannot minify "+srcName+":", err)
success = false
}
if verbose {
dur := time.Since(startTime)
speed := "Inf MB"
if 0 < dur {
speed = humanize.Bytes(uint64(float64(r.N) / dur.Seconds()))
}
ratio := 1.0
if 0 < r.N {
ratio = float64(w.N) / float64(r.N)
}
stats := fmt.Sprintf("(%9v, %6v, %6v, %5.1f%%, %6v/s)", dur, humanize.Bytes(uint64(r.N)), humanize.Bytes(uint64(w.N)), ratio*100, speed)
if srcName != dstName {
Info.Println(stats, "-", srcName, "to", dstName)
} else {
Info.Println(stats, "-", srcName)
}
}
fr.Close()
if bw, ok := w.Writer.(*bufio.Writer); ok {
bw.Flush()
}
fw.Close()
// remove original that was renamed, when overwriting files
for i := range t.srcs {
if t.srcs[i] == t.dst+".bak" {
if err == nil {
if err = os.Remove(t.srcs[i]); err != nil {
Error.Println(err)
return false
}
} else {
if err = os.Remove(t.dst); err != nil {
Error.Println(err)
return false
} else if err = os.Rename(t.srcs[i], t.dst); err != nil {
Error.Println(err)
return false
}
}
t.srcs[i] = t.dst
break
}
}
preserveAttributes(t.srcs[0], t.dst)
return success
}
func preserveAttributes(src, dst string) {
if src != "" && dst != "" {
srcInfo, err := os.Stat(src)
if err != nil {
Warning.Println(err)
return
}
if preserveMode {
err = os.Chmod(dst, srcInfo.Mode().Perm())
if err != nil {
Warning.Println(err)
}
}
if preserveOwnership {
if uid, gid, ok := getOwnership(srcInfo); ok {
err = os.Chown(dst, uid, gid)
if err != nil {
Warning.Println(err)
}
} else {
Warning.Println(fmt.Errorf("preserve ownership not supported on platform"))
}
}
if preserveTimestamps {
err = os.Chtimes(dst, atime.Get(srcInfo), srcInfo.ModTime())
if err != nil {
Warning.Println(err)
}
}
}
}