cleanup structure

examples/09_showcase.luash

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+#!/usr/bin/env luash
+-- Luash Showcase: Highlight the best features
+
+print("🚀 Luash - Minimal Lua Shell Scripting")
+print("=" .. string.rep("=", 45))
+
+print("\n💡 Why Luash?")
+print("✓ Clean syntax - no more bash quoting nightmares")
+print("✓ Real programming language features")  
+print("✓ Seamless shell integration")
+print("✓ Minimal and focused")
+
+print("\n📊 Quick Comparison:")
+print("┌─────────────────┬─────────────────────┬─────────────────────┐")
+print("│ Task            │ Bash                │ Luash               │")
+print("├─────────────────┼─────────────────────┼─────────────────────┤")
+print("│ Variables       │ VAR=\"value\"         │ $VAR = \"value\"      │")
+print("│ Command Sub     │ result=$(cmd)       │ result = `cmd`      │")
+print("│ Conditionals    │ if [ -f file ]; fi  │ if `test -f file`   │")
+print("│ Arrays          │ arr=(a b c)         │ arr = {\"a\",\"b\",\"c\"} │")
+print("│ Functions       │ Limited             │ Full Lua functions  │")
+print("└─────────────────┴─────────────────────┴─────────────────────┘")
+
+print("\n🎯 Live Examples:")
+
+print("\n1. Environment & Variables")
+print("   Current user: " .. $USER)
+$GREETING = "Hello from Luash"
+print("   Custom var: " .. $GREETING)
+
+print("\n2. Shell Integration")
+system_info = `uname -a`
+print("   System: " .. system_info)
+
+file_count = `ls | wc -l`
+print("   Files here: " .. file_count)
+
+print("\n3. Real Programming")
+-- Lua's power: functions, tables, proper data types
+function analyze_directory(path)
+    local files = `ls -la ` .. (path or ".")
+    local lines = {}
+    local file_count = 0
+    local total_size = 0
+    
+    for line in files:gmatch("[^\n]+") do
+        if not line:match("^total") and not line:match("^d") then
+            file_count = file_count + 1
+            -- Extract size (5th field in ls -la)
+            local size = line:match("%S+%s+%S+%s+%S+%s+%S+%s+(%d+)")
+            if size then
+                total_size = total_size + tonumber(size)
+            end
+        end
+    end
+    
+    return file_count, total_size
+end
+
+files, size = analyze_directory()
+print("   Analysis: " .. files .. " files, " .. size .. " bytes total")
+
+print("\n4. Error Handling")
+if `which git 2>/dev/null` ~= "" then
+    print("   ✓ Git is available")
+    if `git status 2>/dev/null` ~= "" then
+        branch = `git branch --show-current 2>/dev/null`
+        print("   Current branch: " .. branch)
+    else
+        print("   Not in a git repository")
+    end
+else
+    print("   ✗ Git not installed")
+end
+
+print("\n5. Data Processing")
+-- Create and process some data
+sample_data = {
+    {name = "Alice", score = 95},
+    {name = "Bob", score = 87}, 
+    {name = "Charlie", score = 92}
+}
+
+total_score = 0
+for i = 1, #sample_data do
+    total_score = total_score + sample_data[i].score
+end
+average = total_score / #sample_data
+
+print("   Student scores processed:")
+print("   Average: " .. string.format("%.1f", average))
+
+-- Find highest scorer
+best_student = sample_data[1]
+for i = 2, #sample_data do
+    if sample_data[i].score > best_student.score then
+        best_student = sample_data[i]
+    end
+end
+print("   Top student: " .. best_student.name .. " (" .. best_student.score .. ")")
+
+print("\n🎪 Interactive Demo:")
+print("   Let's see what's running on your system...")
+!ps aux | head -5
+
+print("\n📈 Performance:")
+start_time = `date +%s.%N`
+-- Simulate some work
+for i = 1, 1000 do
+    local _ = string.upper("performance test " .. i)
+end
+end_time = `date +%s.%N`
+
+-- Calculate duration (requires bash-style arithmetic)
+duration = tonumber(end_time) - tonumber(start_time)
+print("   Processed 1000 operations in " .. string.format("%.3f", duration) .. " seconds")
+
+print("\n✨ Try these demos:")
+print("   ./luash demo_quick_examples.luash  # Side-by-side with bash")
+print("   ./luash demo_system_admin.luash    # Sysadmin tasks")
+print("   ./luash demo_development.luash     # Dev workflows") 
+print("   ./luash demo_data_processing.luash # Data analysis")
+
+print("\n🎉 Luash: Shell scripting that doesn't make you cry!")