diff --git a/internal/utils/multiindex.go b/internal/utils/multiindex.go
new file mode 100644
index 0000000..2504bba
--- /dev/null
+++ b/internal/utils/multiindex.go
@@ -0,0 +1,57 @@
+package utils
+
+import (
+	"strings"
+)
+
+type MultiIndex[T any] struct {
+	items   []T
+	indexes []map[string]*T
+}
+
+func NewMultiIndex[T any](numIndexes int) *MultiIndex[T] {
+	m := &MultiIndex[T]{
+		items:   make([]T, 0),
+		indexes: make([]map[string]*T, numIndexes),
+	}
+	for i := range m.indexes {
+		m.indexes[i] = make(map[string]*T)
+	}
+	return m
+}
+
+func (m *MultiIndex[T]) AddItem(item T, searchKeys [][]string) {
+	if len(searchKeys) != len(m.indexes) {
+		panic("searchKeys length must match number of indexes")
+	}
+
+	m.items = append(m.items, item)
+	itemPtr := &m.items[len(m.items)-1]
+
+	for i, key := range searchKeys {
+		m.indexes[i][keyToString(key)] = itemPtr
+	}
+}
+
+func (m *MultiIndex[T]) FindItem(indexNum int, key []string) (T, bool) {
+	var zero T
+	if indexNum < 0 || indexNum >= len(m.indexes) {
+		return zero, false
+	}
+
+	itemPtr, found := m.indexes[indexNum][keyToString(key)]
+	if !found {
+		return zero, false
+	}
+	return *itemPtr, true
+}
+
+func (m *MultiIndex[T]) Items() []T {
+	result := make([]T, len(m.items))
+	copy(result, m.items)
+	return result
+}
+
+func keyToString(parts []string) string {
+	return strings.Join(parts, "\x00")
+}
diff --git a/main.go b/main.go
index 7ac9c86..ccf7add 100644
--- a/main.go
+++ b/main.go
@@ -2,30 +2,210 @@ package main
 
 import (
 	"c65gm/internal/preproc"
+	"flag"
 	"fmt"
+	"os"
+	"strings"
 )
 
-// put the DefineList type in another file (same package) or import it;
-// here I assume definelist.go is in its own package "definelist".
-// If it's in the same package main, just call New() directly.
+// c65cm - A 6502 Cross-Compiler for the ACME Cross-Assembler
+// Copyright (C) 1999, 2025 Mattias Hansson
+// Distributed under GPL. External library github.com/armon/go-radix under MIT.
+
+// Package-level shared state accessible by other compilation units
+var (
+/*
+	VarList         *VarList
+	WhileStack      *LabelStack
+	WendStack       *LabelStack
+	IfStack         *LabelStack
+	GeneralStack    *LabelStack
+	FuncList        *FunctionHandler
+	ConstStrHandler *ConstantStringHandler
+	Pragmas         []string
+*/
+
+)
+
+type ShowMode int
+
+const (
+	ShowNone ShowMode = iota
+	ShowLineCount
+	ShowLineView
+)
 
 func main() {
-	defs := preproc.NewDefineList() // <-- important
+	fmt.Println("c65cm - A 6502 Cross-Compiler for the ACME Cross-Assembler.")
+	fmt.Println("Copyright (C) 1999, 2025 Mattias Hansson. v0.7")
+	fmt.Println("Distributed under GPL. External library github.com/armon/go-radix under MIT.")
+	fmt.Println()
 
-	defs.Add("ARRAY_MIN", "0")
-	defs.Add("ARRAY_MAX", "100")
-	defs.Add("ARRAY_MAX_PAX", "1000")
-	defs.Add("VERSION", "1.0")
-	defs.Add("π", "3.14159")
+	inFile := flag.String("in", "", "input source file (required)")
+	outFile := flag.String("out", "", "output assembly file (required)")
+	view := flag.String("view", "lines", "output mode: none, count, lines")
+	flag.Parse()
 
-	src := `for i := ARRAY_MIN to ARRAY_MAX_PAX do
-  writeln(VERSION);
-  writeln(ARRAY_MAX);
-  const PI = π;`
+	if *inFile == "" || *outFile == "" {
+		fmt.Fprintln(os.Stderr, "Error: -in and -out are required")
+		flag.Usage()
+		os.Exit(1)
+	}
 
-	fmt.Println("Original:\n" + src)
-	fmt.Println("\nReplaced:\n" + defs.ReplaceDefines(src))
-	defs.Delete("ARRAY_MAX_PAX")
-	fmt.Println("\nReplaced (after .Delete):\n" + defs.ReplaceDefines(src))
+	var showMode ShowMode
+	switch strings.ToLower(*view) {
+	case "none":
+		showMode = ShowNone
+	case "count":
+		showMode = ShowLineCount
+	case "lines":
+		showMode = ShowLineView
+	default:
+		fmt.Fprintf(os.Stderr, "Error: invalid view mode: %s\n", *view)
+		os.Exit(1)
+	}
 
+	if err := run(*inFile, *outFile, showMode); err != nil {
+		if _, ok := err.(preproc.HaltError); ok {
+			os.Exit(0)
+		}
+		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+		os.Exit(1)
+	}
+}
+
+func run(inFile, outFile string, showMode ShowMode) error {
+	initSharedObjects()
+	return compile(inFile, outFile, showMode)
+}
+
+func initSharedObjects() {
+	/*
+		VarList = NewVarList()
+		WhileStack = NewLabelStack("whilelbl")
+		WendStack = NewLabelStack("wendlbl")
+		IfStack = NewLabelStack("iflbl")
+		GeneralStack = NewLabelStack("General")
+		FuncList = NewFunctionHandler()
+		ConstStrHandler = NewConstantStringHandler()
+		Pragmas = make([]string, 0)
+	*/
+}
+
+func compile(inFile, outFile string, showMode ShowMode) error {
+	lines, err := preproc.PreProcess(inFile)
+	if err != nil {
+		return fmt.Errorf("preprocessor failed: %w", err)
+	}
+
+	asmSource := make([]string, 0, len(lines)*2)
+	lineCount := 0
+
+	for i := 0; i < len(lines); {
+		line := lines[i]
+		lineCount++
+
+		displayProgress(showMode, lineCount, line.Text)
+
+		// Handle inline ASM blocks
+		if isAsmStart(line) {
+			asmSource = append(asmSource, ";"+line.Text)
+			i++
+
+			for i < len(lines) && !isAsmEnd(lines[i]) {
+				lineCount++
+				displayProgress(showMode, lineCount, lines[i].Text)
+
+				if lines[i].Text != "" {
+					//processed := LocalVarsInAsmLine(lines[i].Text)
+					processed := lines[i].Text
+					asmSource = append(asmSource, processed)
+				}
+				i++
+			}
+
+			i++ // Skip ENDASM line
+			continue
+		}
+
+		if isAsmEnd(line) {
+			i++
+			continue
+		}
+
+		text := stripComments(line.Text)
+		if text == "" {
+			i++
+			continue
+		}
+
+		/*
+			if !InterpretLine(text, &asmSource) {
+				return fmt.Errorf("line not recognized: %s", text)
+			}
+		*/
+
+		i++
+	}
+
+	/*
+		VarList.WriteDownTypesToAsm(&asmSource)
+		ConstStrHandler.GenerateConstStrDecls(&asmSource)
+		VarList.WriteAbsVars(&asmSource)
+		VarList.WriteConstants(&asmSource)
+	*/
+
+	if err := writeLines(outFile, asmSource); err != nil {
+		return fmt.Errorf("failed to write output: %w", err)
+	}
+
+	if showMode != ShowNone {
+		fmt.Println("\ndone.")
+	}
+
+	return nil
+}
+
+func displayProgress(mode ShowMode, lineCount int, text string) {
+	switch mode {
+	case ShowLineCount:
+		fmt.Printf("\rCompiling line: %d", lineCount)
+	case ShowLineView:
+		fmt.Println(text)
+	}
+}
+
+func isAsmStart(line preproc.Line) bool {
+	//return len(line.Tokens) == 1 && strings.ToUpper(line.Tokens[0]) == "ASM"
+	return false
+}
+
+func isAsmEnd(line preproc.Line) bool {
+	//return len(line.Tokens) == 1 && strings.ToUpper(line.Tokens[0]) == "ENDASM"
+	return false
+}
+
+func stripComments(s string) string {
+	if strings.HasPrefix(s, "//") {
+		return ""
+	}
+	if idx := strings.Index(s, "//"); idx >= 0 {
+		return strings.TrimSpace(s[:idx])
+	}
+	return s
+}
+
+func writeLines(filename string, lines []string) error {
+	f, err := os.Create(filename)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	for _, line := range lines {
+		if _, err := fmt.Fprintln(f, line); err != nil {
+			return err
+		}
+	}
+	return nil
 }