Improve stack trace formatting

tools/tui/loop/api.go

@@ -6,7 +6,7 @@ import (
 	"encoding/base64"
 	"fmt"
 	"os"
-	"runtime/debug"
+	"runtime"
 	"strings"
 	"time"
 
@@ -251,11 +251,20 @@ func (self *Loop) DebugPrintln(args ...any) {
 func (self *Loop) Run() (err error) {
 	defer func() {
 		if r := recover(); r != nil {
-			stack := utils.Splitlines(string(debug.Stack()))
+			pcs := make([]uintptr, 256)
+			n := runtime.Callers(2, pcs)
+			frames := runtime.CallersFrames(pcs[:n])
 			err = fmt.Errorf("Paniced: %s", r)
-			fmt.Fprintf(os.Stderr, "\r\nPaniced with error: %s\r\nStacktrace:\r\n", r)
-			for _, line := range stack {
-				fmt.Fprintf(os.Stderr, "%s\r\n", line)
+			fmt.Fprintf(os.Stderr, "\r\nPaniced with error: %s\r\nStacktrace (most recent call first):\r\n", r)
+			found_first_frame := false
+			for frame, more := frames.Next(); more; frame, more = frames.Next() {
+				if !found_first_frame {
+					if strings.HasPrefix(frame.Function, "runtime.") {
+						continue
+					}
+					found_first_frame = true
+				}
+				fmt.Fprintf(os.Stderr, "%s\r\n\t%s:%d\r\n", frame.Function, frame.File, frame.Line)
 			}
 			if self.terminal_options.alternate_screen {
 				term, err := tty.OpenControllingTerm(tty.SetRaw)