Multiline Directive Enhancement

Date: 2025-07-27 20:30
Issue: Multiline directives only support set commands, missing all other XMD directives
Impact: Users cannot use exec, if, for, etc. in multiline blocks as documented

Current Implementation Analysis

Working

  • process_multiline_directive() handles set commands only
  • is_multiline_directive() correctly detects multiline format
  • Documentation shows full multiline support expected

Missing Directives

  • exec - command execution
  • if/elif/else/endif - conditionals
  • for/endfor - loops
  • import - module imports
  • All other supported single-line directives

Technical Requirements

Current Limitations

  1. process_multiline_directive() hardcoded for set only (line 30-34)
  2. No context state management for control flow
  3. No output buffer handling for multiline blocks
  4. No error propagation for failed directives

Required Changes

  1. Extend process_multiline_directive() to support all directive types
  2. Add context management for if/for blocks spanning multiple lines
  3. Implement output buffering for multiline directive results
  4. Error handling for invalid multiline syntax

Implementation Strategy

Phase 1: Core Infrastructure

  • Modify process_multiline_directive() to use generic process_directive()
  • Add multiline context state management
  • Implement output collection for multiline blocks

Phase 2: Control Flow Support

  • Handle if/elif/else/endif blocks in multiline
  • Support for/endfor loops in multiline
  • Proper scope management for nested structures

Phase 3: Advanced Features

  • exec command support with dynamic buffers
  • import directive support
  • Error recovery and validation

Files to Modify

  • src/xmd_processor/process_multiline_directive/process_multiline_directive.c
  • include/xmd_processor_internal.h (function signatures)
  • Tests in appropriate test directories

Expected Behavior

Should work identically to equivalent single-line directives.