Stepping and showing execution point now work

.gitignore

@@ -0,0 +1 @@
+app.log

cmd/pybug/main.go

@@ -1,53 +1,27 @@
 package main
 
 import (
-	// "fmt"
-	// "log/slog"
-	// "time"
-
 	"log/slog"
+	"os"
 
 	b "git.pablu.de/pablu/pybug/internal/bridge"
 	"git.pablu.de/pablu/pybug/ui"
 )
 
 func main() {
-	// slog.SetLogLoggerLevel(slog.LevelDebug)
+	f, err := os.OpenFile("app.log", os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0644)
-
-	//
-	// fmt.Println("Started bridge")
-	//
-	// err = bridge.Breakpoint("test.py", 5)
-	// bridge.OnBreakpoint("test.py", 5, func() {
-	// 	locals, err := bridge.Locals()
-	// 	if err != nil {
-	// 		slog.Error("Encountered error on callback", "error", err)
-	// 		return
-	// 	}
-	//
-	// 	for key, val := range locals {
-	// 		slog.Info("found local variable", "key", key, "value", val)
-	// 	}
-	// })
-	//
-	// bridge.Continue()
-	//
-	// time.Sleep(5 * time.Second)
-	//
-	// bridge.Continue()
-	//
-	// err = bridge.Wait()
-	// if err != nil {
-	// 	panic(err)
-	// }
-
-	slog.SetLogLoggerLevel(slog.LevelError)
-
-	bridge := b.NewBridge("test.py")
-	err := bridge.Start()
 	if err != nil {
 		panic(err)
 	}
+	defer f.Close()
+
+	handler := slog.NewTextHandler(f, &slog.HandlerOptions{
+		AddSource: true,
+	})
+
+	slog.SetDefault(slog.New(handler))
+	slog.SetLogLoggerLevel(slog.LevelDebug)
+	bridge := b.NewBridge("test.py")
 
 	err = ui.Run(bridge)
 	if err != nil {

internal/bridge/client.go

@@ -11,6 +11,14 @@ import (
 	"sync"
 )
 
+var ErrNotRunning = errors.New("bridge not running")
+var ErrAlreadyStarted = errors.New("bridge is already running")
+
+type ExecutionPoint struct {
+	File string
+	Line int
+}
+
 type Bridge struct {
 	stdin  io.Writer
 	stdout *bufio.Reader
@@ -22,6 +30,9 @@ type Bridge struct {
 	outputLock *sync.RWMutex
 	output     []chan string
 
+	executionStopLock *sync.RWMutex
+	executionStop     []chan ExecutionPoint
+
 	registry     map[string]chan string
 	registryLock *sync.RWMutex
 
@@ -29,18 +40,15 @@ type Bridge struct {
 
 	callbacksLock *sync.RWMutex
 	callbacks     map[string]map[int]func()
+
+	running bool
+
+	path string
 }
 
 func NewBridge(path string) *Bridge {
-	cmd := exec.Command(
-		"python",
-		"-u",
-		"python/pybug_runtime.py",
-		path,
-	)
-
 	return &Bridge{
-		cmd:          cmd,
+		path:         path,
 		input:        make(chan string),
 		registry:     make(map[string]chan string),
 		registryLock: &sync.RWMutex{},
@@ -51,16 +59,31 @@ func NewBridge(path string) *Bridge {
 
 		output:     make([]chan string, 0),
 		outputLock: &sync.RWMutex{},
+
+		executionStop:     make([]chan ExecutionPoint, 0),
+		executionStopLock: &sync.RWMutex{},
+
+		running: false,
 	}
 }
 
 func (b *Bridge) Start() error {
+	if b.running {
+		return ErrAlreadyStarted
+	}
+
+	b.cmd = exec.Command(
+		"python",
+		"-u",
+		"python/pybug_runtime.py",
+		b.path,
+	)
+
 	var err error
 	b.stdin, err = b.cmd.StdinPipe()
 	if err != nil {
 		return err
 	}
-	// b.cmd.Stdout = os.Stdout
 
 	reader, err := b.cmd.StdoutPipe()
 	if err != nil {
@@ -73,6 +96,7 @@ func (b *Bridge) Start() error {
 		return err
 	}
 
+	b.running = true
 	go b.readLoop()
 	go b.writeLoop()
 
@@ -89,7 +113,21 @@ func (b *Bridge) Subscribe() chan string {
 	return c
 }
 
+func (b *Bridge) SubscribeStopped() chan ExecutionPoint {
+	b.executionStopLock.Lock()
+	defer b.executionStopLock.Unlock()
+
+	c := make(chan ExecutionPoint)
+	b.executionStop = append(b.executionStop, c)
+
+	return c
+}
+
 func (b *Bridge) Locals() (map[string]any, error) {
+	if !b.running {
+		return nil, ErrNotRunning
+	}
+
 	requestId, cmd := makeCommand(LocalsCommand, map[string]any{})
 
 	c := b.sendCommand(requestId, cmd)
@@ -110,8 +148,22 @@ func (b *Bridge) Locals() (map[string]any, error) {
 	return vars, nil
 }
 
+func (b *Bridge) Step() error {
+	if !b.running {
+		return ErrNotRunning
+	}
+
+	_, cmd := makeCommand(StepCommand, nil)
+	b.sendCommandNoResponse(cmd)
+
+	return nil
+}
+
 func (b *Bridge) Breakpoint(file string, line int) error {
 	// Check if breakpoint already exists here
+	if !b.running {
+		return ErrNotRunning
+	}
 
 	requestId, cmd := makeCommand(BreakCommand, map[string]any{
 		"file": file,
@@ -137,10 +189,15 @@ func (b *Bridge) Breakpoint(file string, line int) error {
 	return nil
 }
 
-func (b *Bridge) Continue() {
+func (b *Bridge) Continue() error {
+	if !b.running {
+		return ErrNotRunning
+	}
+
 	_, cmd := makeCommand(ContinueCommand, map[string]any{})
 
 	b.sendCommandNoResponse(cmd)
+	return nil
 }
 
 func (b *Bridge) sendCommandNoResponse(command string) {
@@ -165,6 +222,10 @@ func (b *Bridge) writeLoop() {
 	for {
 		cmd := <-b.input
 
+		if !b.running {
+			return
+		}
+
 		slog.Info("Received command", "cmd", cmd)
 
 		_, err := b.stdin.Write([]byte(cmd + "\n"))
@@ -186,6 +247,7 @@ func (b *Bridge) readLoop() {
 			slog.Error("Error occured while reading from stdout", "error", err)
 			continue
 		} else if errors.Is(err, io.EOF) {
+			b.running = false
 			return
 		}
 
@@ -212,26 +274,62 @@ func (b *Bridge) readLoop() {
 
 			c <- line
 		} else {
+			b.handleStopped(msg)
+		}
+	}
+}
+
+func (b *Bridge) handleStopped(msg map[string]any) error {
 	// TODO: set to stopped
 	if event, ok := msg["event"]; !ok || event != "stopped" {
 		slog.Warn("received unkown event", "msg", msg)
+		return errors.New("unknown event encountered")
 	}
 
 	file := msg["file"].(string)
 	line, ok := toInt(msg["line"])
 	if !ok {
 		slog.Error("could not convert line to int", "line", msg["line"])
+		return errors.New("could not convert line to int")
 	}
 
 	slog.Info("received stopped event")
 	b.callbacksLock.RLock()
+	defer b.callbacksLock.RUnlock()
+
 	if callback, ok := b.callbacks[file][line]; ok {
 		slog.Info("found callback, now running", "file", file, "line", line)
 		go callback()
 	}
-			b.callbacksLock.RUnlock()
+
+	b.executionStopLock.RLock()
+	defer b.executionStopLock.RUnlock()
+
+	for _, c := range b.executionStop {
+		c <- ExecutionPoint{
+			File: file,
+			Line: line,
 		}
 	}
+
+	return nil
+}
+
+func (b *Bridge) OnBreakpoint(file string, line int, callback func()) {
+	b.callbacksLock.Lock()
+	defer b.callbacksLock.Unlock()
+
+	if f, ok := b.callbacks[file]; ok {
+		f[line] = callback
+	} else {
+		b.callbacks[file] = map[int]func(){
+			line: callback,
+		}
+	}
+}
+
+func (b *Bridge) Wait() error {
+	return b.cmd.Wait()
 }
 
 func toInt(v any) (int, bool) {
@@ -254,20 +352,3 @@ func toInt(v any) (int, bool) {
 		return 0, false
 	}
 }
-
-func (b *Bridge) OnBreakpoint(file string, line int, callback func()) {
-	b.callbacksLock.Lock()
-	defer b.callbacksLock.Unlock()
-
-	if f, ok := b.callbacks[file]; ok {
-		f[line] = callback
-	} else {
-		b.callbacks[file] = map[int]func(){
-			line: callback,
-		}
-	}
-}
-
-func (b *Bridge) Wait() error {
-	return b.cmd.Wait()
-}

internal/bridge/protocol.go

@@ -12,6 +12,7 @@ const (
 	ContinueCommand CommandType = "continue"
 	BreakCommand    CommandType = "break"
 	LocalsCommand   CommandType = "locals"
+	StepCommand     CommandType = "step"
 )
 
 func makeCommand(cmd CommandType, values map[string]any) (requestId string, request string) {

ui/model.go

@@ -18,6 +18,9 @@ type Model struct {
 
 	bridge                        *bridge.Bridge
 	listenBridge                  chan string
+	listenBridgeExecutionsStopped chan bridge.ExecutionPoint
+
+	currExecutionPoint bridge.ExecutionPoint
 
 	messages     []string
 	stdoutOutput viewport.Model
@@ -29,6 +32,7 @@ type Model struct {
 
 func NewModel(b *bridge.Bridge, file string, text string) Model {
 	c := b.Subscribe()
+	c2 := b.SubscribeStopped()
 
 	stdoutOutput := viewport.New(0, 0)
 	codeViewer := viewport.New(0, 0)
@@ -40,7 +44,12 @@ func NewModel(b *bridge.Bridge, file string, text string) Model {
 
 		bridge:                        b,
 		listenBridge:                  c,
+		listenBridgeExecutionsStopped: c2,
 
+		currExecutionPoint: bridge.ExecutionPoint{
+			File: file,
+			Line: 0,
+		},
 		breakpoints: make(map[string][]int),
 		messages:    make([]string, 0),
 
@@ -57,8 +66,19 @@ func ListenBridge(ch <-chan string) tea.Cmd {
 	}
 }
 
+func ListenBridgeExecutionsStopped(ch <-chan bridge.ExecutionPoint) tea.Cmd {
+	return func() tea.Msg {
+		msg := <-ch
+		return ExecutionStoppedMsg(msg)
+	}
+}
+
+type ExecutionStoppedMsg bridge.ExecutionPoint
 type StdoutMsg string
 
 func (m Model) Init() tea.Cmd {
-	return ListenBridge(m.listenBridge)
+	return tea.Batch(
+		ListenBridge(m.listenBridge),
+		ListenBridgeExecutionsStopped(m.listenBridgeExecutionsStopped),
+	)
 }

ui/update.go

@@ -1,8 +1,10 @@
 package ui
 
 import (
+	"log/slog"
 	"strings"
 
+	"git.pablu.de/pablu/pybug/internal/bridge"
 	tea "github.com/charmbracelet/bubbletea"
 )
 
@@ -17,6 +19,9 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		m.stdoutOutput.SetContent(strings.Join(m.messages, ""))
 		m.stdoutOutput.GotoBottom()
 		return m, ListenBridge(m.listenBridge)
+	case ExecutionStoppedMsg:
+		m.currExecutionPoint = bridge.ExecutionPoint(msg)
+		return m, ListenBridgeExecutionsStopped(m.listenBridgeExecutionsStopped)
 	}
 
 	return m, nil
@@ -61,8 +66,17 @@ func (m Model) HandleKeyMsg(key tea.KeyMsg) (tea.Model, tea.Cmd) {
 				lineNumber,
 			}
 		}
+	case "s":
+		m.bridge.Step()
 	case "c":
 		m.bridge.Continue()
+	case "r":
+		m.messages = make([]string, 0)
+		m.stdoutOutput.SetContent("")
+		err := m.bridge.Start()
+		if err != nil {
+			slog.Error("could not start brige", "error", err)
+		}
 	}
 
 	return m, nil

ui/view.go

@@ -30,15 +30,20 @@ func (m Model) View() string {
 	for i, line := range lines {
 		breakpoint := " "
 		cursor := " "
+		executor := " "
 
 		if slices.Contains(breakpoints, i+1) {
 			breakpoint = "O"
 		}
 
+		if i+1 == m.currExecutionPoint.Line {
+			executor = "!"
+		}
+
 		if i == m.cursor {
 			cursor = ">"
 		}
-		fmt.Fprintf(&out, "%-4d%s%s %s\n", i+1, breakpoint, cursor, line)
+		fmt.Fprintf(&out, "%-4d%s%s%s %s\n", i+1, breakpoint, executor, cursor, line)
 	}
 
 	m.codeViewer.SetContent(out.String())