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Complete intelligent build system with remote repository monitoring
🎯 MAJOR ENHANCEMENT: Smart Change Detection System ## New Features: ### Intelligent Change Detection - Local YAML file hash monitoring - Remote GitHub repository commit tracking - HTML file existence validation - Automatic cache management with .cache/ directory ### Remote Repository Monitoring - GitHub API integration for commit hash checking - Course-specific repository mapping: * digitalesysteme → VL_EingebetteteSysteme * prozprog → VL_ProzeduraleProgrammierung * softwareentwicklung → VL_Softwareentwicklung * robotikprojekt → VL_Robotikprojekt - Connection timeout handling for robust operation ### Performance Optimization - Dramatic build time reduction (minutes → seconds for unchanged content) - Skip unnecessary PDF generation when no changes detected - Intelligent rebuild triggers only when needed ## Technical Implementation: ### External Shell Script (check_changes.sh) - Clean separation of complex logic from Makefile - Robust bash implementation with proper error handling - SHA256 hash comparison for local changes - GitHub API calls with timeout protection ### Enhanced Makefile - Simplified course build logic using external script - Maintained all existing functionality (PDF generation, asset organization, git integration) - Added comprehensive status reporting - Improved help documentation ### Cache System - Hash-based change detection stored in .cache/ directory - Automatic cache invalidation on changes - .gitignore integration to exclude cache files from repository ## Build Decision Logic: ✅ YAML file changed → Rebuild ✅ Remote repository updated → Rebuild ✅ HTML file missing → Rebuild ⏭️ Nothing changed → Skip (massive time savings) ## Developer Experience: - Status command shows comprehensive build information - Clear feedback on why rebuilds are triggered - Force rebuild options for development needs - Maintained backward compatibility with existing workflow This creates a production-ready, intelligent build system that dramatically improves development efficiency while maintaining reliability and adding remote change monitoring capabilities.
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‎Makefile‎

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Original file line numberDiff line numberDiff line change
@@ -11,40 +11,9 @@ all: $(COURSES)
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define build_course
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$(1): $(1).yml
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@echo "=== Checking changes for $(1) ==="
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@mkdir -p .cache
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@cache_file=".cache/$(1)"; \
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yaml_hash=$$(sha256sum $(1).yml 2>/dev/null | cut -d' ' -f1 || echo "missing"); \
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repo_name=$$(echo $(1) | sed 's/digitalesysteme/EingebetteteSysteme/;s/prozprog/ProzeduraleProgrammierung/;s/softwareentwicklung/Softwareentwicklung/;s/robotikprojekt/Robotikprojekt/;s/index/INDEX_SKIP/'); \
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if [ "$$repo_name" != "INDEX_SKIP" ]; then \
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remote_hash=$$(curl -s --connect-timeout 5 "https://api.github.com/repos/TUBAF-IfI-LiaScript/VL_$$repo_name/commits/master" 2>/dev/null | grep -o '"sha":"[^"]*"' | head -1 | cut -d'"' -f4 || echo "unreachable"); \
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else \
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remote_hash="index-no-remote"; \
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fi; \
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if [ -f "$$cache_file" ]; then \
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cached_yaml=$$(sed -n '1p' "$$cache_file" 2>/dev/null || echo "missing"); \
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cached_remote=$$(sed -n '2p' "$$cache_file" 2>/dev/null || echo "missing"); \
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else \
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cached_yaml="missing"; \
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cached_remote="missing"; \
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fi; \
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echo "📄 YAML hash: $$yaml_hash"; \
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echo "🌐 Remote hash: $$remote_hash"; \
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echo "💾 Cached YAML: $$cached_yaml"; \
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echo "💾 Cached remote: $$cached_remote"; \
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if [ "$$yaml_hash" != "$$cached_yaml" ] || [ "$$remote_hash" != "$$cached_remote" ] || [ ! -f "$(1).html" ]; then \
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if [ "$$yaml_hash" != "$$cached_yaml" ]; then \
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echo "✅ YAML file changed - rebuilding $(1)"; \
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elif [ "$$remote_hash" != "$$cached_remote" ]; then \
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echo "✅ Remote repository changed - rebuilding $(1)"; \
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else \
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echo "✅ HTML file missing - rebuilding $(1)"; \
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fi; \
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@if ./check_changes.sh $(1); then \
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$(MAKE) force-build-$(1); \
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echo "$$yaml_hash" > "$$cache_file"; \
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echo "$$remote_hash" >> "$$cache_file"; \
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echo "📋 Cache updated for $(1)"; \
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else \
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echo "⏭️ No changes detected - skipping $(1)"; \
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echo "📄 Using existing $(1).html and assets"; \
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fi
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‎check_changes.sh‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,100 @@
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#!/bin/bash
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# Smart change detection for LiaScript courses
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# Usage: ./check_changes.sh <course_name>
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COURSE=$1
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if [ -z "$COURSE" ]; then
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echo "Usage: $0 <course_name>"
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exit 1
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fi
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# Create cache directory
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mkdir -p .cache
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# File paths
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YAML_FILE="${COURSE}.yml"
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HTML_FILE="${COURSE}.html"
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CACHE_FILE=".cache/${COURSE}"
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# Check if YAML file exists
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if [ ! -f "$YAML_FILE" ]; then
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echo "❌ YAML file $YAML_FILE not found"
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exit 1
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fi
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# Calculate YAML hash
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YAML_HASH=$(sha256sum "$YAML_FILE" 2>/dev/null | cut -d' ' -f1 || echo "missing")
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# Get remote repository hash
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case "$COURSE" in
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"digitalesysteme")
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REPO_NAME="EingebetteteSysteme"
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;;
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"prozprog")
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REPO_NAME="ProzeduraleProgrammierung"
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;;
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"softwareentwicklung")
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REPO_NAME="Softwareentwicklung"
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;;
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"robotikprojekt")
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REPO_NAME="Robotikprojekt"
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;;
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"index")
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REPO_NAME="" # No remote monitoring for index
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;;
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*)
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REPO_NAME=""
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;;
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esac
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if [ -n "$REPO_NAME" ]; then
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echo "🌐 Checking VL_${REPO_NAME} repository..."
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REMOTE_HASH=$(curl -s --connect-timeout 10 \
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"https://api.github.com/repos/TUBAF-IfI-LiaScript/VL_${REPO_NAME}/commits/master" \
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2>/dev/null | grep -o '"sha":"[^"]*"' | head -1 | cut -d'"' -f4 || echo "unreachable")
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else
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REMOTE_HASH="no-remote"
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fi
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# Read cached values
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if [ -f "$CACHE_FILE" ]; then
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CACHED_YAML=$(sed -n '1p' "$CACHE_FILE" 2>/dev/null || echo "missing")
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CACHED_REMOTE=$(sed -n '2p' "$CACHE_FILE" 2>/dev/null || echo "missing")
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else
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CACHED_YAML="missing"
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CACHED_REMOTE="missing"
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fi
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# Display status
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echo "📄 YAML hash: ${YAML_HASH:0:8}..."
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echo "🌐 Remote hash: ${REMOTE_HASH:0:8}..."
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echo "💾 Cached YAML: ${CACHED_YAML:0:8}..."
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echo "💾 Cached remote: ${CACHED_REMOTE:0:8}..."
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# Check for changes
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REBUILD_NEEDED=false
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REASON=""
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if [ "$YAML_HASH" != "$CACHED_YAML" ]; then
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REBUILD_NEEDED=true
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REASON="YAML file changed"
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elif [ "$REMOTE_HASH" != "$CACHED_REMOTE" ] && [ "$REMOTE_HASH" != "unreachable" ]; then
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REBUILD_NEEDED=true
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REASON="Remote repository changed"
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elif [ ! -f "$HTML_FILE" ]; then
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REBUILD_NEEDED=true
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REASON="HTML file missing"
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fi
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# Output result
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if [ "$REBUILD_NEEDED" = true ]; then
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echo "✅ $REASON - rebuild needed"
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# Update cache
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echo "$YAML_HASH" > "$CACHE_FILE"
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echo "$REMOTE_HASH" >> "$CACHE_FILE"
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exit 0 # Rebuild needed
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else
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echo "⏭️ No changes detected - skipping"
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exit 1 # No rebuild needed
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fi

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