Implement 'build' command

Author: juho05

build/build.go

@@ -0,0 +1,74 @@
+package build
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/Bananenpro/cli"
+	cgExec "github.com/code-game-project/codegame-cli/util/exec"
+)
+
+func BuildClient(projectRoot, gameName, output, url string) error {
+	out, err := getOutputName(projectRoot, output)
+	if err != nil {
+		return err
+	}
+	packageName, err := getPackageName(projectRoot)
+	if err != nil {
+		return err
+	}
+	gamePackageName := strings.ReplaceAll(strings.ReplaceAll(gameName, "-", ""), "_", "")
+
+	cmdArgs := []string{"build", "-o", out, "-ldflags", fmt.Sprintf("-X %s/%s.URL=%s", packageName, gamePackageName, url), filepath.Join(projectRoot, "main.go")}
+
+	_, err = cgExec.Execute(false, "go", cmdArgs...)
+	return err
+}
+
+func BuildServer(projectRoot, output string) error {
+	out, err := getOutputName(projectRoot, output)
+	if err != nil {
+		return err
+	}
+	cmdArgs := []string{"build", "-o", out, filepath.Join(projectRoot, "main.go")}
+	_, err = cgExec.Execute(false, "go", cmdArgs...)
+	return err
+}
+
+func getOutputName(projectRoot, output string) (string, error) {
+	absRoot, err := filepath.Abs(projectRoot)
+	if err != nil {
+		return "", err
+	}
+	if output == "" {
+		output = filepath.Base(absRoot)
+	}
+
+	if stat, err := os.Stat(output); err == nil && stat.IsDir() {
+		return "", cli.Error("'%s' already exists and is a directory. Specify another output name with '-o <name>'.", output)
+	}
+
+	return output, nil
+}
+
+func getPackageName(projectRoot string) (string, error) {
+	path := filepath.Join(projectRoot, "go.mod")
+	file, err := os.Open(path)
+	if err != nil {
+		return "", cli.Error("Failed to open '%s'", path)
+	}
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		if strings.HasPrefix(scanner.Text(), "module ") {
+			return strings.TrimSuffix(strings.TrimPrefix(scanner.Text(), "module "), "/"), nil
+		}
+	}
+	if scanner.Err() != nil {
+		cli.Error("Failed to read '%s': %s", path, scanner.Err())
+	}
+	return "", cli.Error("Missing 'module' statement in '%s'", path)
+}

main.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/Bananenpro/cli"
 	"github.com/Bananenpro/pflag"
+	"github.com/code-game-project/codegame-cli-go/build"
 	"github.com/code-game-project/codegame-cli-go/new/client"
 	"github.com/code-game-project/codegame-cli-go/new/server"
 	"github.com/code-game-project/codegame-cli-go/run"
@@ -20,6 +21,7 @@ func main() {
 		fmt.Fprintln(os.Stderr, "\nCommands:")
 		fmt.Fprintln(os.Stderr, "\tnew \tCreate a new project.")
 		fmt.Fprintln(os.Stderr, "\trun \tRun the current project.")
+		fmt.Fprintln(os.Stderr, "\tbuild \tBuild the current project.")
 		fmt.Fprintln(os.Stderr, "\nOptions:")
 		pflag.PrintDefaults()
 		fmt.Fprintln(os.Stderr, "This program expects to be executed inside of the project directory.")
@@ -43,6 +45,8 @@ func main() {
 		err = newProject(projectName)
 	case "run":
 		err = runProject()
+	case "build":
+		err = buildProject()
 	default:
 		err = cli.Error("Unknown command: %s\n", command)
 	}
@@ -135,3 +139,38 @@ func runProject() error {
 
 	return err
 }
+
+func buildProject() error {
+	flagSet := pflag.NewFlagSet("build", pflag.ExitOnError)
+
+	var output string
+	flagSet.StringVarP(&output, "output", "o", "", "The name of the output file.")
+
+	flagSet.Usage = func() {
+		fmt.Fprintf(os.Stderr, "Usage: %s build [...]\n", os.Args[0])
+		fmt.Fprintln(os.Stderr, "\nOptions:")
+		flagSet.PrintDefaults()
+	}
+	flagSet.Parse(os.Args[2:])
+
+	projectRoot, err := cgfile.FindProjectRootRelative()
+	if err != nil {
+		return err
+	}
+
+	data, err := cgfile.LoadCodeGameFile(projectRoot)
+	if err != nil {
+		return err
+	}
+
+	switch data.Type {
+	case "client":
+		err = build.BuildClient(projectRoot, data.Game, output, data.URL)
+	case "server":
+		err = build.BuildServer(projectRoot, output)
+	default:
+		err = cli.Error("Unknown project type: %s\n", data.Type)
+	}
+
+	return err
+}