Implement docs command

Author: juho05

external/external.go

@@ -0,0 +1,60 @@
+package external
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"os/user"
+	"runtime"
+	"strings"
+)
+
+func IsInstalled(programName string) bool {
+	_, err := exec.LookPath(programName)
+	return err == nil
+}
+
+func Execute(programName string, args ...string) error {
+	cmd := exec.Command(programName, args...)
+	cmd.Stdin = os.Stdin
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	return cmd.Run()
+}
+
+func ExecuteHidden(programName string, args ...string) (string, error) {
+	cmd := exec.Command(programName, args...)
+	cmd.Stdin = os.Stdin
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	out, err := cmd.CombinedOutput()
+	return string(out), err
+}
+
+func GetUsername() string {
+	name, err := ExecuteHidden("git", "config", "user.name")
+	if err == nil {
+		return strings.TrimSpace(name)
+	}
+
+	user, err := user.Current()
+	if err == nil {
+		return strings.TrimSpace(user.Username)
+	}
+
+	fmt.Println("Make sure to replace <your-name> with your actual name.")
+	return "<your-name>"
+}
+
+func OpenBrowser(url string) error {
+	switch runtime.GOOS {
+	case "linux":
+		return exec.Command("xdg-open", url).Start()
+	case "windows":
+		return exec.Command("rundll32", "url.dll,FileProtocolHandler", url).Start()
+	case "darwin":
+		return exec.Command("open", url).Start()
+	default:
+		return fmt.Errorf("unsupported platform")
+	}
+}

go.mod

@@ -0,0 +1,5 @@
+module github.com/code-game-project/codegame-cli
+
+go 1.18
+
+require github.com/ogier/pflag v0.0.1

go.sum

@@ -0,0 +1,2 @@
+github.com/ogier/pflag v0.0.1 h1:RW6JSWSu/RkSatfcLtogGfFgpim5p7ARQ10ECk5O750=
+github.com/ogier/pflag v0.0.1/go.mod h1:zkFki7tvTa0tafRvTBIZTvzYyAu6kQhPZFnshFFPE+g=

main.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/code-game-project/codegame-cli/external"
+	"github.com/ogier/pflag"
+)
+
+func main() {
+	pflag.Usage = func() {
+		fmt.Fprintf(os.Stderr, "Usage: %s <command> [...]\n", os.Args[0])
+		fmt.Fprintln(os.Stderr, "\nDescription:")
+		fmt.Fprintln(os.Stderr, "\nThe official CodeGame CLI.")
+		fmt.Fprintln(os.Stderr, "\nCommands:")
+		fmt.Fprintln(os.Stderr, "\tnew \tCreate a new project.")
+		fmt.Fprintln(os.Stderr, "\tupdate \tUpdate the CodeGame libraries in the current project.")
+		fmt.Fprintln(os.Stderr, "\tdocs \tOpen the CodeGame documentation in a web browser.")
+		fmt.Fprintln(os.Stderr, "\nAbout: https://github.com/code-game-project")
+		fmt.Fprintln(os.Stderr, "Copyright (c) 2022 CodeGame Contributors (https://github.com/orgs/code-game-project/people)")
+		pflag.PrintDefaults()
+	}
+	pflag.Parse()
+
+	if pflag.NArg() == 0 {
+		pflag.Usage()
+		os.Exit(1)
+	}
+
+	command := strings.ToLower(pflag.Arg(0))
+
+	var err error
+	switch command {
+	case "docs":
+		err = external.OpenBrowser("https://github.com/code-game-project/docs/blob/main/README.md")
+	default:
+		fmt.Println("Unknown command:", strings.ToLower(pflag.Arg(0)))
+		pflag.Usage()
+		os.Exit(1)
+	}
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}