#!/usr/bin/env luash
-- Quick Examples: Bite-sized demos showing luash vs bash

print("=== Luash vs Bash: Quick Examples ===\n")

print("1. Environment Variables")
print("   Bash: echo $USER")
print("   Luash: print($USER)")
print("   → " .. $USER)

print("\n2. Variable Assignment")
print("   Bash: MY_VAR=\"hello\"")
print("   Luash: $MY_VAR = \"hello\"")
$MY_VAR = "hello"
print("   → " .. $MY_VAR)

print("\n3. Command Substitution")
print("   Bash: current_dir=$(pwd)")
print("   Luash: current_dir = `pwd`")
current_dir = `pwd`
print("   → " .. current_dir)

print("\n4. Conditional Logic")
print("   Bash: if [ -f \"README.md\" ]; then echo \"exists\"; fi")
print("   Luash: if `test -f README.md` == \"\" then print(\"missing\") else print(\"exists\") end")
if `test -f README.md && echo "yes"` == "yes" then
    print("   → exists")
else
    print("   → missing")
end

print("\n5. Loops with Arrays")
print("   Bash: for file in *.lua; do echo $file; done")
print("   Luash: files = `ls *.lua`; for file in files:gmatch(\"[^\\n]+\") do print(file) end")
files = `ls *.luash`
print("   → Files found:")
for file in files:gmatch("[^\n]+") do
    print("     " .. file)
end

print("\n6. String Processing")
print("   Bash: echo \"hello world\" | tr '[:lower:]' '[:upper:]'")
print("   Luash: string.upper(\"hello world\")")
print("   → " .. string.upper("hello world"))

print("\n7. Math Operations")
print("   Bash: result=$((5 + 3))")
print("   Luash: result = 5 + 3")
result = 5 + 3
print("   → " .. result)

print("\n8. File Operations")
print("   Bash: cat file.txt | wc -l")
print("   Luash: line_count = `cat luash | wc -l`")
line_count = `cat luash | wc -l`
print("   → " .. line_count .. " lines in luash script")

print("\n9. Error Handling")
print("   Bash: command || echo \"failed\"")
print("   Luash: if `command 2>/dev/null` == \"\" then print(\"failed\") end")
if `nonexistent_command 2>/dev/null` == "" then
    print("   → command failed (as expected)")
end

print("\n10. Complex Data Structures")
print("   Bash: (limited array support)")
print("   Luash: Full Lua tables!")
data = {
    users = {"alice", "bob", "charlie"},
    scores = {alice = 95, bob = 87, charlie = 92}
}
print("   → Users: " .. table.concat(data.users, ", "))
print("   → Alice's score: " .. data.scores.alice)

print("\n✨ Luash combines the best of shell scripting with Lua's power!")