debugger: start of a debugging TUI for GARY

Uses the serial debug module and currently only works with
hardware/ulx3s, probably only on my specific machine where the
USB serial port is mapped _just so_. But it does work. Very WIP
unclean code, but checkpointing because it can hex view and hexedit
correctly.

debugger/hexview.go

@@ -0,0 +1,190 @@
+package main
+
+import (
+	"fmt"
+	"math"
+	"strings"
+	"unicode"
+
+	tea "github.com/charmbracelet/bubbletea"
+	lip "github.com/charmbracelet/lipgloss"
+	"github.com/creachadair/mds/slice"
+)
+
+type HexViewUpdateMem struct {
+	addr  int
+	bytes []byte
+}
+
+type HexView struct {
+	AddrStyle lip.Style
+	ZeroStyle lip.Style
+	HexStyle  lip.Style
+
+	write        func(int, byte) tea.Cmd
+	firstAddr    int // top of viewport
+	bytes        []byte
+	selectedAddr int
+	editing      bool
+	editNibble   int // 0 or 1
+	newByte      byte
+}
+
+func NewHexView(size int, writeByte func(addr int, val byte) tea.Cmd) HexView {
+	st := lip.NewStyle()
+	ret := HexView{
+		AddrStyle: st,
+		ZeroStyle: st,
+		HexStyle:  st,
+		write:     writeByte,
+		bytes:     make([]byte, size),
+	}
+	return ret
+}
+
+func (m HexView) Width() int {
+	hexdumpWidth := 16*3 + 2     // including spaces between dquads
+	addrWidth := m.addrNibbles() // Hex nibbles needed to represent all addrs
+	return addrWidth + 4 + hexdumpWidth
+}
+
+func (m HexView) SelectedAddr() int {
+	return m.selectedAddr
+}
+
+func (m HexView) addrFormat() string {
+	return fmt.Sprintf("%%%dx", m.addrNibbles())
+}
+
+func (m HexView) addrNibbles() int {
+	return int(math.Ceil(math.Log2(float64(len(m.bytes)-1)))) / 4
+}
+
+func (m HexView) Update(msg tea.Msg) (HexView, tea.Cmd) {
+	if m.editing {
+		return m.updateEditMode(msg)
+	} else {
+		return m.updateViewMode(msg)
+	}
+}
+
+func (m HexView) updateEditMode(msg tea.Msg) (HexView, tea.Cmd) {
+	switch msg := msg.(type) {
+	case HexViewUpdateMem:
+		copy(m.bytes[msg.addr:], msg.bytes)
+	case tea.KeyMsg:
+		switch msg.Type {
+		case tea.KeyLeft:
+			if m.editNibble == 1 {
+				m.editNibble = 0
+			}
+		case tea.KeyRight:
+			if m.editNibble == 0 {
+				m.editNibble = 1
+			}
+		case tea.KeyEsc:
+			m.editing = false
+		case tea.KeyEnter:
+			m.editing = false
+			return m, m.write(m.selectedAddr, m.newByte)
+		case tea.KeyRunes:
+			if unicode.In(msg.Runes[0], unicode.ASCII_Hex_Digit) {
+				nibble := hexToNibble(msg.Runes[0])
+				if m.editNibble == 0 {
+					m.newByte = (nibble << 4) + (m.newByte & 0xF)
+					m.editNibble++
+				} else {
+					m.newByte = (m.newByte & 0xF0) + nibble
+				}
+			}
+		}
+	}
+	return m, nil
+}
+
+func hexToNibble(r rune) byte {
+	switch {
+	case r >= '0' && r <= '9':
+		return byte(r - '0')
+	case r >= 'a' && r <= 'f':
+		return byte(r - 'a' + 10)
+	case r >= 'A' && r <= 'F':
+		return byte(r - 'A' + 10)
+	}
+	panic("invalid hex rune")
+}
+
+func (m HexView) updateViewMode(msg tea.Msg) (HexView, tea.Cmd) {
+	switch msg := msg.(type) {
+	case HexViewUpdateMem:
+		copy(m.bytes[msg.addr:], msg.bytes)
+	case tea.KeyMsg:
+		switch msg.String() {
+		case "up":
+			if m.selectedAddr >= 16 {
+				m.selectedAddr -= 16
+			}
+		case "down":
+			if m.selectedAddr < len(m.bytes)-16 {
+				m.selectedAddr += 16
+			}
+		case "left":
+			if m.selectedAddr > 0 {
+				m.selectedAddr--
+			}
+		case "right":
+			if m.selectedAddr < len(m.bytes)-1 {
+				m.selectedAddr++
+			}
+		case "pgdown":
+		// TODO
+		case "pgup":
+		// TODO
+		case "w":
+			m.editing = true
+			m.editNibble = 0
+			m.newByte = m.bytes[m.selectedAddr]
+		}
+	}
+	return m, nil
+}
+
+func (m HexView) View(height int) string {
+	maxLen := 16 * height
+	endAddr := min(len(m.bytes), m.firstAddr+maxLen)
+	var ret strings.Builder
+	addrFormat := m.addrFormat()
+	for line, bytes := range slice.Chunks(m.bytes[m.firstAddr:endAddr], 16) {
+		lineAddr := m.firstAddr + (16 * line)
+		ret.WriteString(m.AddrStyle.Render(fmt.Sprintf(addrFormat, lineAddr)))
+		ret.WriteString("   ")
+		for i, b := range bytes {
+			byteAddr := lineAddr + i
+			if i == 8 {
+				ret.WriteString("   ")
+			} else if i != 0 {
+				ret.WriteByte(' ')
+			}
+			if m.editing && byteAddr == m.selectedAddr {
+				st := m.HexStyle.Underline(true)
+				s1, s2 := st.Reverse(true), st
+				if m.editNibble == 1 {
+					s1, s2 = s2, s1
+				}
+				b = m.newByte
+				ret.WriteString(s1.Render(fmt.Sprintf("%01x", b>>4)))
+				ret.WriteString(s2.Render(fmt.Sprintf("%01x", b&0xF)))
+			} else {
+				st := m.HexStyle
+				if m.selectedAddr == byteAddr {
+					st = m.HexStyle.Reverse(true)
+				} else if b == 0 {
+					st = m.ZeroStyle
+				}
+				ret.WriteString(st.Render(fmt.Sprintf("%02x", b)))
+			}
+		}
+		ret.WriteByte('\n')
+	}
+	return strings.TrimRight(ret.String(), "\n")
+}

debugger/main.go

@@ -19,15 +19,13 @@ func main() {
 	}
 	defer dbg.Close()
 
-	fmt.Println("Writing...")
 	if err := dbg.Write(0x42, 123); err != nil {
 		log.Fatalf("writing to memory: %v", err)
 	}
-	v, err := dbg.Read(0x42)
+
-	if err != nil {
+	if err := UI(dbg); err != nil {
-		log.Fatalf("reading from memory: %v", err)
+		log.Fatal(err)
 	}
-	fmt.Printf("addr 0: %02x\n", v)
 }
 
 type Debugger struct {
@@ -73,7 +71,7 @@ func (d *Debugger) Read(addr int) (byte, error) {
 	}
 
 	packet := encode(addr, false, 0)
-	fmt.Printf("Writing: %02x %02x %02x %02x\n", packet[0], packet[1], packet[2], packet[3])
+	//fmt.Printf("Writing: %02x %02x %02x %02x\n", packet[0], packet[1], packet[2], packet[3])
 	if _, err := d.port.Write(packet[:]); err != nil {
 		return 0, err
 	}
@@ -97,9 +95,21 @@ func (d *Debugger) Write(addr int, val byte) error {
 	}
 
 	packet := encode(addr, true, val)
-	fmt.Printf("Writing: %02x %02x %02x %02x\n", packet[0], packet[1], packet[2], packet[3])
+	//fmt.Printf("Writing: %02x %02x %02x %02x\n", packet[0], packet[1], packet[2], packet[3])
 	if _, err := d.port.Write(packet[:]); err != nil {
 		return err
 	}
 	return nil
 }
+
+func (d *Debugger) Dump(startAddr int, count int) ([]byte, error) {
+	ret := make([]byte, count)
+	var err error
+	for i := range ret {
+		ret[i], err = d.Read(startAddr + i)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return ret, nil
+}

debugger/ui.go

@@ -0,0 +1,201 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+	"unicode"
+
+	tea "github.com/charmbracelet/bubbletea"
+	lip "github.com/charmbracelet/lipgloss"
+)
+
+func UI(dbg *Debugger) error {
+	p := tea.NewProgram(initialModel(dbg)) //failed{0, 0, true}, tea.WithAltScreen())
+	if _, err := p.Run(); err != nil {
+		return err
+	}
+	return nil
+}
+
+var (
+	amber     = lip.Color("#ffb00")
+	slate     = lip.Color("235")
+	text      = lip.NewStyle().Foreground(amber).Background(slate)
+	faintText = text.Faint(true)
+	box       = text.Border(lip.NormalBorder(), true, true, true, true).
+			BorderForeground(amber).
+			BorderBackground(slate)
+)
+
+type msgErr struct {
+	err error
+}
+
+type msgUpdateStatus struct {
+	status string
+}
+
+type debugger struct {
+	width     int
+	height    int
+	dbg       *Debugger
+	hex       HexView
+	lastErr   error
+	bottomMsg string
+}
+
+func initialModel(dbg *Debugger) debugger {
+	ret := debugger{
+		width:     0,
+		height:    0,
+		dbg:       dbg,
+		bottomMsg: "",
+	}
+	hex := NewHexView(128*1024, ret.writeByte)
+	hex.AddrStyle = text
+	hex.ZeroStyle = faintText
+	hex.HexStyle = text
+	ret.hex = hex
+	return ret
+}
+
+func (m debugger) Init() tea.Cmd {
+	return m.dumpMemory(0x200)
+}
+
+func staticMsg(msg tea.Msg) tea.Cmd {
+	return func() tea.Msg {
+		return msg
+	}
+}
+
+func (m debugger) dumpMemory(count int) tea.Cmd {
+	var ret []tea.Cmd
+	for i := 0; i < count; i += 16 {
+		ret = append(ret, func() tea.Msg {
+			mem, err := m.dbg.Dump(i, 16)
+			if err != nil {
+				return msgErr{err}
+			}
+			return HexViewUpdateMem{i, mem}
+		})
+	}
+	return tea.Sequence(ret...)
+}
+
+func (m debugger) writeByte(addr int, val byte) tea.Cmd {
+	return tea.Sequence(
+		staticMsg(msgUpdateStatus{"Writing..."}),
+		func() tea.Msg {
+			if err := m.dbg.Write(addr, val); err != nil {
+				return msgUpdateStatus{fmt.Sprintf("Write failed: %v", err)}
+			}
+			return tea.BatchMsg{
+				staticMsg(HexViewUpdateMem{addr, []byte{val}}),
+				staticMsg(msgUpdateStatus{"Written!"}),
+			}
+		},
+		m.dumpMemory(0x200),
+	)
+}
+
+func (m debugger) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+	switch msg := msg.(type) {
+	case tea.WindowSizeMsg:
+		m.width = msg.Width
+		m.height = msg.Height
+	case tea.KeyMsg:
+		switch msg.String() {
+		case "ctrl+c", "q":
+			return m, tea.Quit
+		case "r":
+			return m, m.dumpMemory(0x200)
+		}
+	case msgErr:
+		m.lastErr = msg.err
+		return m, nil
+	case msgUpdateStatus:
+		m.bottomMsg = msg.status
+	}
+	var cmd tea.Cmd
+	m.hex, cmd = m.hex.Update(msg)
+	return m, cmd
+}
+
+// func (m debugger) values(addr int) string {
+// 	var v [4]byte
+// 	copy(v[:], m.vram[addr:])
+// 	var out strings.Builder
+// 	out.WriteString(text.Render("Bin: "))
+// 	out.WriteString(renderBytes(v[:], "%08b", "_"))
+// 	out.WriteByte('\n')
+// 	out.WriteString(text.Render("Hex: "))
+// 	out.WriteString(renderBytes(v[:], "%02x", "_"))
+// 	out.WriteByte('\n')
+// 	out.WriteString(text.Render("Dec: "))
+// 	out.WriteString(faintText.Render("["))
+// 	out.WriteString(dimZero(fmt.Sprintf("%3d", v[0])))
+// 	out.WriteString(faintText.Render("] ["))
+// 	out.WriteString(dimZero(fmt.Sprintf("%5d", binary.BigEndian.Uint16(v[:]))))
+// 	out.WriteString(faintText.Render("] ["))
+// 	out.WriteString(dimZero(fmt.Sprintf("%10d", binary.BigEndian.Uint32(v[:]))))
+// 	out.WriteString(faintText.Render("]"))
+
+// 	return out.String()
+// }
+
+func (m debugger) View() string {
+	if m.width < 80 || m.height < 20 {
+		return lip.Place(m.width, m.height, lip.Center, lip.Center, "Please embiggen your terminal")
+	}
+
+	statusBar := text.Width(m.width).Height(1).Align(lip.Center)
+	topSegment := statusBar.Width(m.width / 3).Reverse(true)
+
+	hexBox := lip.NewStyle().Border(lip.NormalBorder()).BorderForeground(amber).BorderBackground(slate).Padding(1, 2)
+	hexHeight := m.height - 2 - hexBox.GetVerticalFrameSize()
+	hex := hexBox.Render(m.hex.View(hexHeight))
+
+	topLeft := text.Reverse(true).Bold(true).Render("Addr: ") + text.Reverse(true).Render(fmt.Sprintf("0x%-5x", m.hex.SelectedAddr()))
+	topLeft = topSegment.Padding(0, 1).Align(lip.Left).Render(topLeft)
+	topMid := topSegment.Bold(true).Render("GARY Debugger")
+	topRight := topSegment.Render("")
+	topStatus := lip.JoinHorizontal(lip.Top, topLeft, topMid, topRight)
+	bottomStatus := statusBar.Render(m.bottomMsg)
+
+	top := lip.JoinVertical(lip.Center, topStatus, hex, bottomStatus)
+	return top
+}
+
+func renderByte(b byte, format string) string {
+	ret := fmt.Sprintf(format, b)
+	if b == 0 {
+		return faintText.Render(ret)
+	}
+	return text.Render(ret)
+}
+
+func renderBytes(bs []byte, format string, sep string) string {
+	var s strings.Builder
+	for i, b := range bs {
+		s.WriteString(renderByte(b, format))
+		if i < len(bs)-1 {
+			s.WriteString(faintText.Render(sep))
+		}
+	}
+	return s.String()
+}
+
+func dimZero(s string) string {
+	allZero := true
+	for _, r := range s {
+		if !unicode.IsSpace(r) && r != '0' {
+			allZero = false
+			break
+		}
+	}
+	if allZero {
+		return faintText.Render(s)
+	}
+	return text.Render(s)
+}

go.mod

@@ -1,9 +1,33 @@
 module git.sentinel65x.com/dave/gary
 
-go 1.22.6
+go 1.23
+
+toolchain go1.23.0
 
 require (
-	github.com/creack/goselect v0.1.2 // indirect
+	github.com/charmbracelet/bubbles v0.20.0
-	go.bug.st/serial v1.6.2 // indirect
+	github.com/charmbracelet/bubbletea v1.1.1
-	golang.org/x/sys v0.0.0-20220829200755-d48e67d00261 // indirect
+	github.com/charmbracelet/lipgloss v0.13.0
+	github.com/creachadair/mds v0.21.2
+	go.bug.st/serial v1.6.2
+)
+
+require (
+	github.com/atotto/clipboard v0.1.4 // indirect
+	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
+	github.com/charmbracelet/x/ansi v0.2.3 // indirect
+	github.com/charmbracelet/x/term v0.2.0 // indirect
+	github.com/creack/goselect v0.1.2 // indirect
+	github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f // indirect
+	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mattn/go-localereader v0.0.1 // indirect
+	github.com/mattn/go-runewidth v0.0.16 // indirect
+	github.com/muesli/ansi v0.0.0-20230316100256-276c6243b2f6 // indirect
+	github.com/muesli/cancelreader v0.2.2 // indirect
+	github.com/muesli/termenv v0.15.2 // indirect
+	github.com/rivo/uniseg v0.4.7 // indirect
+	golang.org/x/sync v0.8.0 // indirect
+	golang.org/x/sys v0.24.0 // indirect
+	golang.org/x/text v0.3.8 // indirect
 )

go.sum

@@ -1,6 +1,51 @@
+github.com/atotto/clipboard v0.1.4 h1:EH0zSVneZPSuFR11BlR9YppQTVDbh5+16AmcJi4g1z4=
+github.com/atotto/clipboard v0.1.4/go.mod h1:ZY9tmq7sm5xIbd9bOK4onWV4S6X0u6GY7Vn0Yu86PYI=
+github.com/aymanbagabas/go-osc52/v2 v2.0.1 h1:HwpRHbFMcZLEVr42D4p7XBqjyuxQH5SMiErDT4WkJ2k=
+github.com/aymanbagabas/go-osc52/v2 v2.0.1/go.mod h1:uYgXzlJ7ZpABp8OJ+exZzJJhRNQ2ASbcXHWsFqH8hp8=
+github.com/charmbracelet/bubbles v0.20.0 h1:jSZu6qD8cRQ6k9OMfR1WlM+ruM8fkPWkHvQWD9LIutE=
+github.com/charmbracelet/bubbles v0.20.0/go.mod h1:39slydyswPy+uVOHZ5x/GjwVAFkCsV8IIVy+4MhzwwU=
+github.com/charmbracelet/bubbletea v1.1.1 h1:KJ2/DnmpfqFtDNVTvYZ6zpPFL9iRCRr0qqKOCvppbPY=
+github.com/charmbracelet/bubbletea v1.1.1/go.mod h1:9Ogk0HrdbHolIKHdjfFpyXJmiCzGwy+FesYkZr7hYU4=
+github.com/charmbracelet/lipgloss v0.13.0 h1:4X3PPeoWEDCMvzDvGmTajSyYPcZM4+y8sCA/SsA3cjw=
+github.com/charmbracelet/lipgloss v0.13.0/go.mod h1:nw4zy0SBX/F/eAO1cWdcvy6qnkDUxr8Lw7dvFrAIbbY=
+github.com/charmbracelet/x/ansi v0.2.3 h1:VfFN0NUpcjBRd4DnKfRaIRo53KRgey/nhOoEqosGDEY=
+github.com/charmbracelet/x/ansi v0.2.3/go.mod h1:dk73KoMTT5AX5BsX0KrqhsTqAnhZZoCBjs7dGWp4Ktw=
+github.com/charmbracelet/x/term v0.2.0 h1:cNB9Ot9q8I711MyZ7myUR5HFWL/lc3OpU8jZ4hwm0x0=
+github.com/charmbracelet/x/term v0.2.0/go.mod h1:GVxgxAbjUrmpvIINHIQnJJKpMlHiZ4cktEQCN6GWyF0=
+github.com/creachadair/mds v0.21.2 h1:D5130qi/kqmu+gGUQyDNOhrocGQp075ziTCgttxhh3k=
+github.com/creachadair/mds v0.21.2/go.mod h1:1ltMWZd9yXhaHEoZwBialMaviWVUpRPvMwVP7saFAzM=
 github.com/creack/goselect v0.1.2 h1:2DNy14+JPjRBgPzAd1thbQp4BSIihxcBf0IXhQXDRa0=
 github.com/creack/goselect v0.1.2/go.mod h1:a/NhLweNvqIYMuxcMOuWY516Cimucms3DglDzQP3hKY=
+github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f h1:Y/CXytFA4m6baUTXGLOoWe4PQhGxaX0KpnayAqC48p4=
+github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f/go.mod h1:vw97MGsxSvLiUE2X8qFplwetxpGLQrlU1Q9AUEIzCaM=
+github.com/lucasb-eyer/go-colorful v1.2.0 h1:1nnpGOrhyZZuNyfu1QjKiUICQ74+3FNCN69Aj6K7nkY=
+github.com/lucasb-eyer/go-colorful v1.2.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
+github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
+github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/mattn/go-localereader v0.0.1 h1:ygSAOl7ZXTx4RdPYinUpg6W99U8jWvWi9Ye2JC/oIi4=
+github.com/mattn/go-localereader v0.0.1/go.mod h1:8fBrzywKY7BI3czFoHkuzRoWE9C+EiG4R1k4Cjx5p88=
+github.com/mattn/go-runewidth v0.0.15 h1:UNAjwbU9l54TA3KzvqLGxwWjHmMgBUVhBiTjelZgg3U=
+github.com/mattn/go-runewidth v0.0.15/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
+github.com/mattn/go-runewidth v0.0.16 h1:E5ScNMtiwvlvB5paMFdw9p4kSQzbXFikJ5SQO6TULQc=
+github.com/mattn/go-runewidth v0.0.16/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
+github.com/muesli/ansi v0.0.0-20230316100256-276c6243b2f6 h1:ZK8zHtRHOkbHy6Mmr5D264iyp3TiX5OmNcI5cIARiQI=
+github.com/muesli/ansi v0.0.0-20230316100256-276c6243b2f6/go.mod h1:CJlz5H+gyd6CUWT45Oy4q24RdLyn7Md9Vj2/ldJBSIo=
+github.com/muesli/cancelreader v0.2.2 h1:3I4Kt4BQjOR54NavqnDogx/MIoWBFa0StPA8ELUXHmA=
+github.com/muesli/cancelreader v0.2.2/go.mod h1:3XuTXfFS2VjM+HTLZY9Ak0l6eUKfijIfMUZ4EgX0QYo=
+github.com/muesli/termenv v0.15.2 h1:GohcuySI0QmI3wN8Ok9PtKGkgkFIk7y6Vpb5PvrY+Wo=
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