initial commit (second try)

git.go

@@ -0,0 +1,68 @@
+package main
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+func isGitRepository() bool {
+	_, err := os.Stat(".git")
+	return err == nil
+}
+
+func getGitRootPath() (string, error) {
+	output, err := runCommandOutput("git", "rev-parse", "--show-toplevel")
+	if err != nil {
+		return "", errors.New("not in a git repository")
+	}
+	return strings.TrimSpace(output), nil
+}
+
+func getProjectContainerName(lang string) (string, error) {
+	if !isGitRepository() {
+		return "", errors.New("must be run inside a git repository")
+	}
+
+	gitRoot, err := getGitRootPath()
+	if err != nil {
+		return "", err
+	}
+
+	cwd, err := os.Getwd()
+	if err != nil {
+		return "", err
+	}
+
+	relPath, err := filepath.Rel(gitRoot, cwd)
+	if err != nil {
+		return "", err
+	}
+
+	projectName := filepath.Base(gitRoot)
+	
+	var pathComponents []string
+	if relPath != "." {
+		pathComponents = strings.Split(relPath, string(os.PathSeparator))
+	}
+
+	containerName := "hako-" + lang + "-" + sanitizeName(projectName)
+	for _, component := range pathComponents {
+		containerName += "-" + sanitizeName(component)
+	}
+
+	if len(containerName) > 60 {
+		return "", errors.New("container name too long, try running from a shallower directory")
+	}
+
+	return containerName, nil
+}
+
+func sanitizeName(name string) string {
+	result := strings.ToLower(name)
+	result = strings.ReplaceAll(result, " ", "_")
+	result = strings.ReplaceAll(result, ".", "_")
+	result = strings.ReplaceAll(result, "-", "_")
+	return result
+}