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main.go
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main.go
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package main
import (
"errors"
"flag"
"fmt"
"io/fs"
"os"
"os/exec"
"path"
"path/filepath"
"sort"
"strings"
"github.com/Zyko0/please"
"github.com/fatih/color"
"github.com/otiai10/copy"
)
var (
loaderCodeFmt = []byte(`package main
import (
"github.com/Zyko0/please"
)
func init() {
please.SetMode(please.Mode("%s"))
please.GlitchMe()
}
`)
)
var (
gologs bool
mode string
)
func debugLog(format string, args ...any) {
color.Set(color.FgHiGreen, color.Bold)
fmt.Printf(format+"\n", args...)
color.Unset()
}
func goLog(text string) {
if !gologs {
return
}
color.Set(color.FgWhite)
fmt.Print(text)
color.Unset()
}
func errorLog(format string, args ...any) {
color.Set(color.FgRed, color.Bold)
fmt.Fprintf(os.Stderr, format+"\n", args...)
color.Unset()
}
func resolvePackagePath(pkg, version string) (string, error) {
gopath, _ := os.LookupEnv("GOPATH")
gopath = path.Clean(gopath)
// Try /src
srcPath := path.Join(gopath, "src", pkg)
if fi, err := os.Stat(srcPath); err == nil && fi.IsDir() {
return srcPath, nil
}
// Normalize pkg mod with '!'
var normalized string
for _, r := range pkg {
if r >= 'A' && r <= 'Z' {
normalized += "!" + string(r+32)
} else {
normalized += string(r)
}
}
pkg = normalized
// Try /pkg/mod without version
pkgPath := path.Join(gopath, "pkg", "mod", pkg)
if fi, err := os.Stat(pkgPath); err == nil && fi.IsDir() {
return pkgPath, nil
}
// Try /pkg/mod without version
pkgPathVer := path.Join(gopath, "pkg", "mod", pkg+version)
if fi, err := os.Stat(pkgPathVer); err == nil && fi.IsDir() {
return pkgPathVer, nil
}
// Look for latest /pkg/mod version suffix
pkgPathParent, _ := path.Split(pkgPath)
_, name := path.Split(pkg)
var candidates []fs.FileInfo
err := filepath.WalkDir(pkgPathParent, func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
if !d.IsDir() {
return nil
}
if d.Name() == "" {
return nil
}
dirName := strings.Split(d.Name(), "@")
if dirName[0] == name {
info, err := d.Info()
if err != nil {
return err
}
candidates = append(candidates, info)
}
return nil
})
if err != nil {
return "", err
}
// Pick the most recent version "naively"
if len(candidates) > 0 {
sortFunc := func(i, j int) bool {
return candidates[i].Name() > candidates[j].Name()
}
// If "@latest" has been specified, try to naively find by strcmp
if version != "@latest" {
sortFunc = func(i, j int) bool {
return candidates[i].ModTime().After(candidates[j].ModTime())
}
}
sort.SliceStable(candidates, sortFunc)
dirName := candidates[0].Name()
return path.Clean(path.Join(pkgPathParent, dirName)), nil
}
return "", errors.New("couldn't resolve go package location")
}
func validateMode() error {
mode = strings.ToUpper(mode)
switch please.Mode(mode) {
case please.None, please.Default, please.Medium, please.Unsafe:
return nil
default:
return errors.New("err: invalid glitch mode '" + mode + "'")
}
}
func main() {
gopath, ok := os.LookupEnv("GOPATH")
if !ok {
errorLog("no GOPATH environment variable found")
return
}
flag.BoolVar(&gologs, "golog", false, "Outputs logs resulting from 'go' commands (default: false)")
flag.StringVar(&mode, "mode", "default", "Select a glitch mode (none,default,medium,unsafe)")
flag.Usage()
flag.Parse()
goPkg := flag.Arg(0)
if goPkg == "" {
errorLog("err: missing ebitengine go package argument")
flag.Usage()
return
}
if err := validateMode(); err != nil {
errorLog(err.Error())
flag.Usage()
return
}
debugLog("GOPATH: %s", gopath)
goPkgLocalExec := flag.Arg(1)
if goPkgLocalExec != "" {
debugLog("Go application path: %s", path.Clean(path.Join(goPkg, goPkgLocalExec)))
}
goPkgRoot := path.Clean(goPkg)
goPkgRootNoVersion := goPkgRoot
var version string
if idx := strings.LastIndex(goPkgRoot, "@"); idx >= 0 {
version = goPkgRoot[idx:]
debugLog("Version: %s", version)
goPkgRootNoVersion = goPkgRoot[:idx]
}
// Create a temporary directory
debugLog("Creating a temporary directory...")
pathTmpDir, err := os.MkdirTemp("", "pleaseglitch_")
if err != nil {
errorLog("err: couldn't create temporary directory: %v", err)
return
}
defer func() {
debugLog("Deleting temporary directory...")
err := os.RemoveAll(pathTmpDir)
if err != nil {
errorLog("err: couldn't remove temporary directory: %v", err)
return
}
debugLog("Temporary directory deleted from: %s", pathTmpDir)
}()
debugLog("Created a temporary directory at: %s", pathTmpDir)
// go mod init __glitch => create a temporary go mod to allow download versioned packages
os.Setenv("GO111MODULE", "on")
debugLog("Executing 'go mod init %s'", "__glitch")
cmd := exec.Command("go", "mod", "init", "__glitch")
cmd.Dir = pathTmpDir
cmd.Env = os.Environ()
out, err := cmd.CombinedOutput()
if len(out) > 0 {
goLog(string(out))
}
if err != nil {
errorLog("err: couldn't execute 'go mod init %s': %v", "__glitch", err)
return
}
// go get
cmd = exec.Command("go", "get", goPkgRoot)
cmd.Dir = pathTmpDir
cmd.Env = os.Environ()
debugLog("Executing 'go get %s'", goPkgRoot)
out, err = cmd.CombinedOutput()
if len(out) > 0 {
goLog(string(out))
}
if err != nil {
errorLog("err: couldn't execute 'go get %s': %v", goPkgRoot, err)
return
}
// Resolve go package location
pathTmpExec := path.Join(pathTmpDir, goPkgLocalExec)
loaderPath := path.Join(pathTmpExec, "pleaseglitchloader.go")
debugLog("Resolving go package location...")
pathGoRepoPkgRoot, err := resolvePackagePath(goPkgRootNoVersion, version)
if err != nil {
errorLog("err: couldn't locate cloned go package: %v\n", err)
return
}
debugLog("Go package found at: %s", pathGoRepoPkgRoot)
// Copy cloned directory to tmp one
debugLog("Copying go package to temporary directory...")
err = copy.Copy(pathGoRepoPkgRoot, pathTmpDir, copy.Options{
Specials: true,
AddPermission: fs.ModePerm,
})
if err != nil {
errorLog("err: couldn't copy to temporary directory %v\n", err)
return
}
// Write auto init file into user package
debugLog("Creating loader file at: %s...", loaderPath)
err = os.WriteFile(
loaderPath,
[]byte(fmt.Sprintf(string(loaderCodeFmt), mode)),
os.FileMode(0644),
)
if err != nil {
errorLog("err: couldn't write loader file to temporary directory: %v", err)
return
}
debugLog("Loader file created")
// go get glitch package
debugLog("Executing 'go get github.com/Zyko0/please'")
cmd = exec.Command("go", "get", "github.com/Zyko0/please")
cmd.Dir = pathTmpDir
cmd.Env = os.Environ()
out, err = cmd.CombinedOutput()
if len(out) > 0 {
goLog(string(out))
}
if err != nil {
errorLog("err: couldn't execute 'go get github.com/Zyko0/please': %v", err)
return
}
// go mod tidy
debugLog("Executing 'go mod tidy'")
cmd = exec.Command("go", "mod", "tidy")
cmd.Dir = pathTmpDir
cmd.Env = os.Environ()
out, err = cmd.CombinedOutput()
if len(out) > 0 {
goLog(string(out))
}
if err != nil {
errorLog("err: couldn't execute 'go mod tidy': %v", err)
return
}
// go run
debugLog("Executing 'go run .'")
cmd = exec.Command("go", "run", ".")
cmd.Dir = pathTmpExec
cmd.Env = os.Environ()
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
// Start command asynchronously
err = cmd.Start()
if len(out) > 0 {
goLog(string(out))
}
if err != nil {
errorLog("err: couldn't execute 'go run .': %v", err)
return
}
// Wait for the command to complete
debugLog("Waiting for application to complete")
err = cmd.Wait()
if err != nil {
errorLog("err: couldn't wait for the application to complete: %v", err)
return
}
}