added better error handling to render/render.go

internal/render/render.go

@@ -7,71 +7,94 @@ import (
 	"strings"
 	"text/template"
 
-	"specCon18/bubblewand/embed"
-	"specCon18/bubblewand/internal/logger"
+	"specCon18/bubblewand/embed"           // Import embedded template files
+	"specCon18/bubblewand/internal/logger" // Import logger for logging output
 )
 
-// ProgramData holds user-supplied template values
+// ProgramData holds user-supplied values for template substitution.
 type ProgramData struct {
-	ModName        string
-	PackageName    string
-	ProgramVersion string
-	ProgramDesc    string
-	OutputDir      string
+	ModName        string // Module name
+	PackageName    string // Go package name
+	ProgramVersion string // Version string
+	ProgramDesc    string // Description of the program
+	OutputDir      string // Target output directory for rendered files
 }
 
 // RenderTemplates renders embedded .tmpl files into outputDir
 func RenderTemplates(data ProgramData, outputDir string, verbose bool) error {
-	var renderedFiles int
+	var renderedFiles int // Count of successfully rendered files
 
+	// Walk through the embedded templates filesystem starting at "templates"
 	err := fs.WalkDir(embed.Templates, "templates", func(path string, d fs.DirEntry, err error) error {
 		if err != nil {
+			// Log and return error encountered while walking the filesystem
+			logger.Log.Errorf("Error walking path %q: %v", path, err)
 			return err
 		}
+
+		// Skip directories and files that do not end with ".tmpl"
 		if d.IsDir() || !strings.HasSuffix(d.Name(), ".tmpl") {
 			return nil
 		}
 
-		// Get relative path inside templates/
+		// Strip the "templates/" prefix from path and remove ".tmpl" extension
 		relPath := strings.TrimPrefix(path, "templates/")
 		outputPath := filepath.Join(outputDir, strings.TrimSuffix(relPath, ".tmpl"))
 
+		// Ensure the parent directory for the output file exists
 		if err := os.MkdirAll(filepath.Dir(outputPath), 0755); err != nil {
+			logger.Log.Errorf("Failed to create directory for %s: %v", outputPath, err)
 			return err
 		}
 
+		// Read the embedded template file
 		tmplBytes, err := embed.Templates.ReadFile(path)
 		if err != nil {
+			logger.Log.Errorf("Failed to read template %s: %v", path, err)
 			return err
 		}
 
+		// Parse the template content
 		tmpl, err := template.New(d.Name()).Parse(string(tmplBytes))
 		if err != nil {
+			logger.Log.Errorf("Failed to parse template %s: %v", path, err)
 			return err
 		}
 
+		// Create the output file for writing the rendered content
 		outFile, err := os.Create(outputPath)
 		if err != nil {
+			logger.Log.Errorf("Failed to create output file %s: %v", outputPath, err)
 			return err
 		}
 		defer outFile.Close()
 
+		// Log the render operation if verbose mode is enabled
 		if verbose {
 			logger.Log.Infof("Rendering %s → %s", path, outputPath)
 		}
 
-		renderedFiles++
-		return tmpl.Execute(outFile, data)
-	})
-
-	if err != nil {
+		// Execute the template using the provided data and write to file
+		if err := tmpl.Execute(outFile, data); err != nil {
+			logger.Log.Errorf("Failed to execute template %s: %v", path, err)
 			return err
 		}
 
+		renderedFiles++
+		return nil
+	})
+
+	// If any error occurred during the walk/render process, log and return it
+	if err != nil {
+		logger.Log.Errorf("Template rendering failed: %v", err)
+		return err
+	}
+
+	// If not verbose and at least one file was rendered, print a summary log
 	if !verbose && renderedFiles > 0 {
 		logger.Log.Info("Rendering templates")
 	}
 
-	return nil
+	return nil // Success
 }