/
main.go
267 lines (217 loc) · 6.13 KB
/
main.go
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package main
import (
"github.com/jimmysawczuk/worker"
"github.com/pkg/errors"
"encoding/json"
"flag"
"fmt"
"os"
"os/exec"
"path/filepath"
"regexp"
"strings"
"time"
)
var pathToLessc string
var lesscArgs lesscArg
var pathToCSSMin string
var workingDirectory string
var isVerbose bool
var enableCSSMin bool
var force bool
var maxJobs = 4
var version = "1.7.0"
var lessFilename = regexp.MustCompile(`^([A-Za-z0-9_\-\.]+)\.less$`)
type lesscArg struct {
in string
out []string
}
func init() {
flag.StringVar(&pathToLessc, "lessc-path", "", "Path to the lessc executable")
flag.Var(&lesscArgs, "lessc-args", "Any extra arguments/flags to pass to lessc before the paths (specified as a JSON array)")
flag.BoolVar(&isVerbose, "v", false, "Whether or not to show LESS errors")
flag.IntVar(&maxJobs, "max-jobs", maxJobs, "Maximum amount of jobs to run at once")
flag.BoolVar(&force, "f", false, "If true, all CSS will be rebuilt regardless of whether or not the source LESS file(s) changed")
flag.BoolVar(&enableCSSMin, "min", false, "Automatically minify outputted css files")
flag.StringVar(&pathToCSSMin, "cssmin-path", "", "Path to cssmin (or an executable which takes an input file as an argument and spits out minified CSS in stdout)")
flag.Usage = func() {
versions()
fmt.Printf("Usage: less-tree [options] <dir> <another-dir>...\n")
flag.PrintDefaults()
}
}
func versions() {
cmd := exec.Command(pathToLessc, "-v")
lesscVersion, err := cmd.CombinedOutput()
if err != nil {
lesscVersion = []byte("lessc not found!")
}
fmt.Printf("less-tree v%s\n", version)
fmt.Printf(" - lessc (%s): %s\n", pathToLessc, strings.TrimSpace(string(lesscVersion)))
fmt.Printf(" - cssmin (%s): enabled: %t\n", pathToCSSMin, enableCSSMin)
fmt.Printf("\n")
}
func main() {
start := time.Now()
flag.Parse()
worker.MaxJobs = maxJobs
err := validateEnvironment()
if err != nil {
fmt.Fprintln(os.Stderr, errors.Wrap(err, "less-tree"))
// these are all path errors, so exit(1) should be okay/meaningful.
os.Exit(1)
return
}
if isVerbose {
versions()
}
cssQueue := worker.NewWorker()
cssQueue.On(worker.JobFinished, func(pk *worker.Package, args ...interface{}) {
job := pk.Job().(*cssJob)
if job.exitCode == 0 {
pk.SetStatus(worker.Finished)
} else {
pk.SetStatus(worker.Errored)
}
})
args := flag.Args()
for _, v := range args {
parseDirectory(v, cssQueue)
}
cssQueue.RunUntilDone()
finish := time.Now()
if len(args) > 0 {
stats := cssQueue.Stats()
successRate := float64(0)
if stats.Total > 0 {
successRate = float64(100*stats.Finished) / float64(stats.Total)
}
if isVerbose {
fmt.Println("--------------------------------------")
}
fmt.Printf("Compiled %d LESS files in %s\n%d ok, %d errored (%.1f%% success rate)\n",
stats.Total,
finish.Sub(start).String(),
stats.Finished,
stats.Errored,
successRate,
)
}
}
func (a *lesscArg) String() string {
return a.in
}
func (a *lesscArg) Set(in string) error {
args := []string{}
err := json.Unmarshal([]byte(in), &args)
if err != nil {
return errors.Wrap(err, "error parsing lessc-args (make sure it's formatted as JSON, i.e. [\"arg1\", \"arg2\"])")
}
a.out = args
return nil
}
func validateEnvironment() error {
wd, err := os.Getwd()
if err != nil {
return errors.New("can't find the working directory")
}
workingDirectory = wd
// if the path to lessc is explicitly provided and we can't find it, that's a big problem
if pathToLessc != "" {
path, err := exec.LookPath(pathToLessc)
if err != nil {
return errors.Errorf("the lessc path provided (%s) is invalid", pathToLessc)
}
pathToLessc = path
} else {
paths := []string{
"./node_modules/.bin/lessc",
"lessc",
}
lesscFound := false
for _, path := range paths {
p, err := exec.LookPath(path)
if err == nil {
lesscFound = true
pathToLessc = p
break
}
}
if !lesscFound {
return errors.New("couldn't find lessc executable from the inferred paths: " + strings.Join(paths, "; "))
}
}
// Only validate the cssmin executable if we're actually trying to use it
if enableCSSMin {
// if the path to cssmin is explicitly provided and we can't find it, that's a big problem
if pathToCSSMin != "" {
path, err := exec.LookPath(pathToCSSMin)
if err != nil {
return errors.Errorf("the cssmin path provided (%s) is invalid", pathToCSSMin)
}
pathToCSSMin = path
} else {
paths := []string{
"./node_modules/.bin/cssmin",
"cssmin",
}
cssminFound := false
for _, path := range paths {
p, err := exec.LookPath(path)
if err == nil {
cssminFound = true
pathToCSSMin = p
break
}
}
if !cssminFound {
return errors.New("couldn't find lessc executable from the inferred paths: " + strings.Join(paths, "; "))
}
}
}
return nil
}
func parseDirectory(dir string, cssQueue *worker.Worker) {
analyzeQueue := worker.NewWorker()
lessFileCh := make(chan *lessFile, 100)
errCh := make(chan error, 100)
stopCh := make(chan bool)
files := []*lessFile{}
crawler, err := newDirectoryCrawler(dir, func(crawler *directoryCrawler, less_dir, css_dir *os.File, less_file os.FileInfo) {
name, _ := filepath.Rel(crawler.rootLESS.Name(), filepath.Join(less_dir.Name(), less_file.Name()))
job := newFindImportsJob(name, less_dir, css_dir, less_file, lessFileCh, errCh)
analyzeQueue.Add(job)
})
if err != nil {
fmt.Printf("error crawling directory %s: %s\n", dir, err)
}
cm := newLessTreeCache(crawler.rootCSS)
err = cm.Load()
go func(less_file_ch chan *lessFile, error_ch chan error, stop_ch chan bool) {
for {
select {
case l := <-less_file_ch:
files = append(files, l)
case err := <-error_ch:
fmt.Printf("err: %s\n", err)
case _ = <-stop_ch:
break
}
}
}(lessFileCh, errCh, stopCh)
crawler.Parse()
if isVerbose {
fmt.Println("finished building queue")
}
analyzeQueue.RunUntilDone()
stopCh <- true
for _, file := range files {
job := newCSSJob(file.Name, file.Dir, file.CSSDir, file.File, lesscArgs.out)
isCached := cm.Test(file)
outputFilesExist := job.OutputFilesExist()
if !isCached || !outputFilesExist || force {
cssQueue.Add(job)
}
}
cm.Save()
}