Add comprehensive help string for available Lua functions

main.go

@@ -58,6 +58,8 @@ func main() {
 		fmt.Fprintf(os.Stderr, "      If expression starts with an operator like *, /, +, -, =, etc., v1 is automatically prepended\n")
 		fmt.Fprintf(os.Stderr, "      You can use any valid Lua code, including if statements, loops, etc.\n")
 		fmt.Fprintf(os.Stderr, "      Glob patterns are supported for file selection (*.xml, data/**.xml, etc.)\n")
+		fmt.Fprintf(os.Stderr, "\nLua Functions Available:\n")
+		fmt.Fprintf(os.Stderr, "%s\n", processor.GetLuaFunctionsHelp())
 	}
 	// TODO: Fix bed shitting when doing *.yml in barotrauma directory
 	flag.Parse()

processor/processor.go

@@ -502,3 +502,51 @@ func evalRegex(L *lua.LState) int {
 
 	return 0
 }
+
+// GetLuaFunctionsHelp returns a comprehensive help string for all available Lua functions
+func GetLuaFunctionsHelp() string {
+	return `Lua Functions Available in Global Environment:
+
+MATH FUNCTIONS:
+  min(a, b)           - Returns the minimum of two numbers
+  max(a, b)           - Returns the maximum of two numbers
+  round(x, n)         - Rounds x to n decimal places (default 0)
+  floor(x)            - Returns the floor of x
+  ceil(x)             - Returns the ceiling of x
+
+STRING FUNCTIONS:
+  upper(s)            - Converts string to uppercase
+  lower(s)            - Converts string to lowercase
+  format(s, ...)      - Formats string using Lua string.format
+  trim(s)             - Removes leading/trailing whitespace
+  strsplit(inputstr, sep) - Splits string by separator (default: whitespace)
+  num(str)            - Converts string to number (returns 0 if invalid)
+  str(num)            - Converts number to string
+  is_number(str)      - Returns true if string is numeric
+
+TABLE FUNCTIONS:
+  DumpTable(table, depth) - Prints table structure recursively
+  isArray(t)          - Returns true if table is a sequential array
+
+HTTP FUNCTIONS:
+  fetch(url, options) - Makes HTTP request, returns response table
+    options: {method="GET", headers={}, body=""}
+    returns: {status, statusText, ok, body, headers}
+
+REGEX FUNCTIONS:
+  re(pattern, input)  - Applies regex pattern to input string
+    returns: table with matches (index 0 = full match, 1+ = groups)
+
+UTILITY FUNCTIONS:
+  print(...)          - Prints arguments to Go logger
+
+EXAMPLES:
+  round(3.14159, 2)   -> 3.14
+  strsplit("a,b,c", ",") -> {"a", "b", "c"}
+  upper("hello")      -> "HELLO"
+  min(5, 3)           -> 3
+  num("123")          -> 123
+  is_number("abc")    -> false
+  fetch("https://api.example.com/data")
+  re("(\\w+)@(\\w+)", "user@domain.com") -> {"user@domain.com", "user", "domain.com"}`
+}