Use "cobra" to propose better command/flags

cmd/main.go

@@ -0,0 +1,140 @@
+package cmd
+
+import (
+	"errors"
+	"fmt"
+	"katenary/compose"
+	"katenary/generator"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+)
+
+var composeFiles = []string{"docker-compose.yaml", "docker-compose.yml"}
+var ComposeFile = ""
+var AppName = "MyApp"
+var Version = "master" // set at build time to the git version/tag
+var ChartsDir = "chart"
+
+var AppVersion = "0.0.1"
+
+func init() {
+	FindComposeFile()
+	SetAppName()
+	SetAppVersion()
+}
+
+func FindComposeFile() bool {
+	for _, file := range composeFiles {
+		if _, err := os.Stat(file); err == nil {
+			ComposeFile = file
+			return true
+		}
+	}
+	return false
+}
+
+// SetAppName sets the application name from the current directory name.
+func SetAppName() {
+	wd, err := os.Getwd()
+	if err != nil {
+		return
+	}
+	AppName = filepath.Base(wd)
+
+	if AppName == "" {
+		AppName = "MyApp"
+	}
+}
+
+// SetAppVersion set the AppVersion variable to the git version/tag
+func SetAppVersion() {
+	AppVersion, _ = detectGitVersion()
+}
+
+// Try to detect the git version/tag.
+func detectGitVersion() (string, error) {
+	defaulVersion := "0.0.1"
+	// Check if .git directory exists
+	if s, err := os.Stat(".git"); err != nil {
+		// .git should be a directory
+		return defaulVersion, errors.New("no git repository found")
+	} else if !s.IsDir() {
+		// .git should be a directory
+		return defaulVersion, errors.New(".git is not a directory")
+	}
+
+	// check if "git" executable is callable
+	if _, err := exec.LookPath("git"); err != nil {
+		return defaulVersion, errors.New("git executable not found")
+	}
+
+	// get the latest commit hash
+	if out, err := exec.Command("git", "log", "-n1", "--pretty=format:%h").Output(); err == nil {
+		latestCommit := strings.TrimSpace(string(out))
+		// then get the current branch/tag
+		out, err := exec.Command("git", "branch", "--show-current").Output()
+		if err != nil {
+			return defaulVersion, errors.New("git branch --show-current failed")
+		} else {
+			currentBranch := strings.TrimSpace(string(out))
+			// finally, check if the current tag (if exists) correspond to the current commit
+			// git describe --exact-match --tags <latestCommit>
+			out, err := exec.Command("git", "describe", "--exact-match", "--tags", latestCommit).Output()
+			if err == nil {
+				return strings.TrimSpace(string(out)), nil
+			} else {
+				return currentBranch + "-" + latestCommit, nil
+			}
+		}
+	}
+	return defaulVersion, errors.New("git log failed")
+}
+
+func Convert(composeFile, appVersion, appName, chartDir string, force bool) {
+	composeFound := FindComposeFile()
+	_, err := os.Stat(ComposeFile)
+	if !composeFound && err != nil {
+		fmt.Println("No compose file found")
+		os.Exit(1)
+	}
+
+	dirname := filepath.Join(chartDir, appName)
+	if _, err := os.Stat(dirname); err == nil && !force {
+		response := ""
+		for response != "y" && response != "n" {
+			response = "n"
+			fmt.Printf(""+
+				"The %s directory already exists, it will be \x1b[31;1mremoved\x1b[0m!\n"+
+				"Do you really want to continue? [y/N]: ", dirname)
+			fmt.Scanf("%s", &response)
+			response = strings.ToLower(response)
+		}
+		if response == "n" {
+			fmt.Println("Cancelled")
+			os.Exit(0)
+		}
+	}
+
+	// cleanup and create the chart directory (until "templates")
+	if err := os.RemoveAll(dirname); err != nil {
+		fmt.Printf("Error removing %s: %s\n", dirname, err)
+		os.Exit(1)
+	}
+
+	// create the templates directory
+	templatesDir := filepath.Join(dirname, "templates")
+	if err := os.MkdirAll(templatesDir, 0755); err != nil {
+		fmt.Printf("Error creating %s: %s\n", templatesDir, err)
+		os.Exit(1)
+	}
+
+	// Parse the compose file now
+	p := compose.NewParser(ComposeFile)
+	p.Parse(appName)
+
+	// start generator
+	generator.Generate(p, Version, appName, appVersion, ComposeFile, dirname)
+
+}