temp: control is returned back to python

Wrote to Steve.

examples/S99_more/maze/maze_solve.py

@@ -11,6 +11,7 @@
 from pathlib import Path
 import typing as T
 
+
 def add_maze(s, mazefile) -> T.List[smoldyn.Panel]:
     """Add maze"""
     panels = []
@@ -31,8 +32,8 @@ def add_maze(s, mazefile) -> T.List[smoldyn.Panel]:
 A = s.addSpecies("A", difc=2, color="blue")
 A.addToSolution(1000, pos=[15, 15])
 
-B = s.addSpecies("B", difc=0, color='black', display_size=3)
-B.addToSolution(10, lowpos=[105,112], highpos=[110,112])
+B = s.addSpecies("B", difc=0, color="black", display_size=3)
+B.addToSolution(10, lowpos=[105, 112], highpos=[110, 112])
 
 panels = add_maze(s, Path(__file__).parent / "maze.txt")
 maze = s.addSurface("maze", panels=panels)
@@ -42,12 +43,14 @@ def add_maze(s, mazefile) -> T.List[smoldyn.Panel]:
 
 # When any A meets B, maze is solved. So we set a reaction between A and B
 s.addReaction("done", [A, B], [], rate=10)
-s.addCommand("ifless B 10 text ", "E")
 
 # Stop when A + B -> ∅ happens i.e. maze is solved.
-s.addCommand("ifless B 10 pause", "E")
-
-# TODO: Show the solution.
+s.addOutputData('posdata')
+s.addCommand("molpos B posdata", "E")
+s.addCommand("ifless B 10 stop", "E")
 
 s.addGraphics("opengl", iter=50)
-s.run(3000, dt=0.01)
+s.run(3000, dt=0.01, quit_at_end=True)
+
+print(s.getOutputData("posdata"))
+print('all done')

source/Smoldyn/smolsim.cpp

@@ -2533,8 +2533,16 @@ int simulatetimestep(simptr sim) {
 	sim->time+=sim->dt;													// --- end of time step ---
 	simsetvariable(sim,"time",sim->time);
 	er=simdocommands(sim);
-	if(er) return er;
+#ifdef COMPILE_AS_PY_MODULE
+    if(er == 7) {
+        fprintf(stdout, "command stop");
+        sim->tmax = sim->time;
+        sim->tbreak = sim->time;
+        er = 0;
+    }
+#endif
 
+	if(er) return er;
 
 	if(sim->time>=sim->tmax) return 1;
 	if(sim->time>=sim->tbreak) return 10;

source/python/CMakeLists.txt

@@ -11,7 +11,6 @@ target_compile_options(_pysmoldyn PRIVATE -DENABLE_PYTHON_CALLBACK)
 # especially where scanf is used for user input.
 target_compile_options(_pysmoldyn PRIVATE -DCOMPILE_AS_PY_MODULE)
 
-
 target_include_directories(_pysmoldyn PRIVATE ${Python3_INCLUDE_DIRS} ${PYBIND11_SOURCE_DIR}/include)
 
 # This is suggested by pybind11: reduces binary size and disables some warnings.