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sim: refactor state machine implementation

- state transitions imply a move, true with any action
- simple move commands just transition back to idle state
- no longer defining action seqs, instead each new state
will set where to transition next to

--- a/dat.h

+++ b/dat.h

@@ -5,7 +5,6 @@

 typedef struct Pics Pics;

 typedef struct Obj Obj;

 typedef struct Path Path;

-typedef struct Action Action;

 typedef struct Command Command;

 typedef struct Munit Munit;

 typedef struct Mresource Mresource;

@@ -189,17 +188,14 @@

 	Mobjl *mapl;

 };

 struct Command{

-	int os;

 	char *name;

-	int (*initfn)(Mobj*);

 	Point goal;

-	vlong arg[4];

-};

-struct Action{

-	int os;

-	char *name;

+	Mobj *target1;

+	Mobj *target2;

+	int (*initfn)(Mobj*);

 	void (*stepfn)(Mobj*);

 	void (*cleanupfn)(Mobj*);

+	void (*nextfn)(Mobj*);

 };

 struct Mobj{

 	Obj *o;

@@ -206,7 +202,6 @@

 	int idx;

 	long uuid;

 	int state;

-	Action *actp;

 	Command cmds[Ncmd];

 	int ctail;

 	Point;

@@ -222,6 +217,7 @@

 	Mobjl *l;

 	Mobjl *lp;

 };

+extern char *statename[OSend];

 struct Tile{

 	Pic *p;

--- a/drw.c

+++ b/drw.c

@@ -113,7 +113,7 @@

 		snprint(s, sizeof s, "%s %d/%d", mo->o->name, mo->hp, mo->o->hp);

 	string(screen, p0, display->white, ZP, font, s);

 	if((mo->o->f & Fresource) == 0){

-		snprint(s, sizeof s, "%s", mo->actp!=nil ? mo->actp->name : "idle");

+		snprint(s, sizeof s, "%s", mo->state < OSend ? statename[mo->state] : "");

 		string(screen, addpt(p0, Pt(0,font->height)), display->white, ZP, font, s);

 	}

 }

--- a/fns.h

+++ b/fns.h

@@ -13,8 +13,7 @@

 void	resourcestate(Mobj*);

 void	idlestate(Mobj*);

 Mobj*	derefmobj(int, long);

-void	nextaction(Mobj*);

-int	pushactions(Mobj*, Action*);

+void	nextstate(Mobj*);

 void	clearcommands(Mobj*);

 void	abortcommands(Mobj*);

 void	popcommand(Mobj*);

--- a/sim.c

+++ b/sim.c

@@ -8,6 +8,11 @@

 int nteam;

 int initres[Nresource], foodcap;

+char *statename[OSend] = {

+	[OSidle] "idle",

+	[OSmove] "moving",

+};

+

 static Mobjl mobjl0 = {.l = &mobjl0, .lp = &mobjl0}, *mobjl = &mobjl0;

 Mobjl *

@@ -59,36 +64,27 @@

 }

 void

-nextaction(Mobj *mo)

+nextstate(Mobj *mo)

 {

-	assert(mo->actp != nil);

-	if(mo->actp->cleanupfn != nil)

-		mo->actp->cleanupfn(mo);

-	mo->actp++;

-	if((mo->state = mo->actp->os) == OSskymaybe){

-		dprint("%M nextaction: done\n", mo);

-		mo->actp = nil;

+	Command *c;

+

+	c = mo->cmds;

+	if(c->cleanupfn != nil)

+		c->cleanupfn(mo);

+	if(c->nextfn != nil)

+		c->nextfn(mo);

+	else

 		popcommand(mo);

-		return;

-	}

-	dprint("%M nextaction: %s\n", mo, mo->actp->name);

 }

-int

-pushactions(Mobj *mo, Action *a)

-{

-	mo->actp = a;

-	mo->state = a->os;

-	dprint("%M pushaction: %s\n", mo, a->name);

-	return 0;

-}

-

 void

 clearcommands(Mobj *mo)

 {

-	if(mo->actp != nil && mo->actp->cleanupfn != nil)

-		mo->actp->cleanupfn(mo);

-	mo->actp = nil;

+	Command *c;

+

+	c = mo->cmds;

+	if(c->cleanupfn != nil)

+		c->cleanupfn(mo);

 	memset(mo->cmds, 0, sizeof mo->cmds);

 	mo->ctail = 0;

 	idlestate(mo);

@@ -125,6 +121,7 @@

 	c = mo->cmds + mo->ctail++;

 	if(mo->state == OSidle)

 		mo->state = OSskymaybe;

+	memset(c, 0, sizeof *c);

 	return c;

 }

@@ -133,13 +130,14 @@

 {

 	Mobjl *ml, *next;

 	Mobj *mo;

+	Command *c;

 	for(ml=mobjl->l, next=ml->l; ml!=mobjl; ml=next, next=next->l){

 		mo = ml->mo;

 		if(mo->state == OSidle)

 			continue;

-		if(mo->actp == nil

-		&& (mo->cmds[0].initfn(mo) < 0 || mo->actp == nil || mo->state == OSskymaybe)){

+		c = mo->cmds;

+		if(mo->state == OSskymaybe && c->initfn(mo) < 0){

 			abortcommands(mo);

 			continue;

 		}

@@ -146,7 +144,7 @@

 		if(mo->state == OSskymaybe)

 			sysfatal("updatemobj: %s cmd %s impossible/stale state %d",

 				mo->o->name, mo->cmds[0].name, mo->state);

-		mo->actp->stepfn(mo);

+		c->stepfn(mo);

 	}

 }

--- a/sim.move.c

+++ b/sim.move.c

@@ -82,7 +82,7 @@

 movedone(Mobj *mo)

 {

 	dprint("%M successfully reached goal\n", mo);

-	nextaction(mo);

+	nextstate(mo);

 }

 static void

@@ -285,40 +285,25 @@

 	}

 }

-static Action acts[] = {

-	{

-		.os = OSmove,

-		.name = "moving",

-		.stepfn = step,

-		.cleanupfn = cleanup,

-	},

-	{

-		.os = OSskymaybe,

-	}

-};

-

 int

 newmove(Mobj *mo)

 {

 	Point goal;

-	Mobj *block;

 	Command *c;

 	c = mo->cmds;

+	c->cleanupfn = cleanup;

 	goal = c->goal;

-	block = nil;

-	if(c->arg[0] >= 0 && (block = derefmobj(c->arg[0], c->arg[1])) == nil)

-		return -1;

-	setgoal(&goal, mo, block);

+	setgoal(&goal, mo, c->target1);	/* FIXME: target[12] might be a problem for returns */

 	if(repath(goal, mo) < 0)

 		return -1;

-	if(pushactions(mo, acts) < 0)

-		return -1;

+	c->stepfn = step;

+	mo->state = OSmove;

 	return 0;

 }

 int

-pushmovecommand(Point goal, Mobj *mo, Mobj *block)

+pushmovecommand(Point goal, Mobj *mo, Mobj *target)

 {

 	Command *c;

@@ -326,14 +311,10 @@

 		fprint(2, "pushmovecommand: %r\n");

 		return -1;

 	}

-	c->os = OSmove;

 	c->name = "move";

 	c->initfn = newmove;

 	c->goal = goal;

-	if(block != nil){

-		c->arg[0] = block->idx;

-		c->arg[1] = block->uuid;

-	}else

-		c->arg[0] = -1;

+	c->target1 = target;

+	c->nextfn = nil;

 	return 0;

 }