ISSUE #3 Improved Error System and User Feedback

[Jeck0v]

Problems

• Uninformative error messages: Errors such as "Parse error: Expected athena_file rule" provide no actionable context.
• No error location: Pest parser errors do not include line/column numbers
• Context switching: Users must guess where the issue lies in their .ath file, slowing debugging.
• Incomplete validation: Critical checks such as port conflicts between services are missing.

### Examples of Enhanced Errors

Error: Parse error at line 15, column 23: Expected 'END SERVICE'
   |
15 | SERVICE backend
   |            ^ Missing END SERVICE for this service block
   |

Suggestion: Add 'END SERVICE' after your service configuration


Error: Port conflict detected: Port 8080 is used by both 'frontend' and 'backend'
Suggestion: Use different host ports, e.g., 8080:80 and 8081:80

Focus On

• Error messages must include line and column numbers
• Automatic suggestions for possible fixes are provided
• Port conflict detection is implemented
• Service reference validation is complete
• Comprehensive tests exist for all error cases