/* Copyright (c) 1997-2002 Miller Puckette and others.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution.  */

/* this file reads and writes the "data" portions of a canvas to a file.
See also canvas_saveto(), etc., in g_editor.c.  The data portion is a
collection of "scalar" objects.  Routines here can save collections of
scalars into a file and reload them; also, support is included here for
*/

#ifdef ROCKBOX
#include "plugin.h"
#include "../../pdbox.h"
#include "m_pd.h"
#include "g_canvas.h"
#else /* ROCKBOX */
#include <stdlib.h>
#include <stdio.h>
#include "m_pd.h"
#include "g_canvas.h"
#include <string.h>
#endif /* ROCKBOX */

    /* the following routines read "scalars" from a file into a canvas. */

static int canvas_scanbinbuf(int natoms, t_atom *vec, int *p_indexout,
    int *p_next)
{
#ifdef ROCKBOX
    int i;
#else
    int i, j;
#endif
    int indexwas = *p_next;
    *p_indexout = indexwas;
    if (indexwas >= natoms)
    	return (0);
    for (i = indexwas; i < natoms && vec[i].a_type != A_SEMI; i++)
    	;
    if (i >= natoms)
    	*p_next = i;
    else *p_next = i + 1;
    return (i - indexwas);
}

int glist_readscalar(t_glist *x, int natoms, t_atom *vec,
    int *p_nextmsg, int selectit);

static void canvas_readerror(int natoms, t_atom *vec, int message, 
    int nline, char *s)
{
#ifdef ROCKBOX
    (void) natoms;
#endif
    error(s);
    startpost("line was:");
    postatom(nline, vec + message);
    endpost();
}

    /* fill in the contents of the scalar into the vector w. */

static void glist_readatoms(t_glist *x, int natoms, t_atom *vec,
    int *p_nextmsg, t_symbol *templatesym, t_word *w, int argc, t_atom *argv)
{
#ifdef ROCKBOX
    int message, n, i;
#else
    int message, nline, n, i;
#endif

    t_template *template = template_findbyname(templatesym);
    if (!template)
    {
	error("%s: no such template", templatesym->s_name);
	*p_nextmsg = natoms;
	return;
    }
    word_restore(w, template, argc, argv);
    n = template->t_n;
    for (i = 0; i < n; i++)
    {
    	if (template->t_vec[i].ds_type == DT_ARRAY)
	{
#ifndef ROCKBOX
	    int j;
#endif
	    t_array *a = w[i].w_array;
	    int elemsize = a->a_elemsize, nitems = 0;
	    t_symbol *arraytemplatesym = template->t_vec[i].ds_arraytemplate;
	    t_template *arraytemplate =
	    	template_findbyname(arraytemplatesym);
	    if (!arraytemplate)
	    {
	    	error("%s: no such template", arraytemplatesym->s_name);
	    }
	    else while (1)
	    {
		t_word *element;
		int nline = canvas_scanbinbuf(natoms, vec, &message, p_nextmsg);
		    /* empty line terminates array */
		if (!nline)
		    break;
		array_resize(a, arraytemplate, nitems + 1);
		element = (t_word *)(((char *)a->a_vec) +
		    nitems * elemsize);
		glist_readatoms(x, natoms, vec, p_nextmsg, arraytemplatesym,
		    element, nline, vec + message);
		nitems++;
	    }
	}
	else if (template->t_vec[i].ds_type == DT_LIST)
	{
	    while (1)
	    {
	    	if (!glist_readscalar(w->w_list, natoms, vec,
		    p_nextmsg, 0))
		    	break;
    	    }
    	}
    }
}

int glist_readscalar(t_glist *x, int natoms, t_atom *vec,
    int *p_nextmsg, int selectit)
{
#ifdef ROCKBOX
    int message, nline;
#else
    int message, i, j, nline;
#endif
    t_template *template;
    t_symbol *templatesym;
    t_scalar *sc;
    int nextmsg = *p_nextmsg;
    int wasvis = glist_isvisible(x);

    if (nextmsg >= natoms || vec[nextmsg].a_type != A_SYMBOL)
    {
    	if (nextmsg < natoms)
	    post("stopping early: type %d", vec[nextmsg].a_type);
    	*p_nextmsg = natoms;
    	return (0);
    }
    templatesym = canvas_makebindsym(vec[nextmsg].a_w.w_symbol);
    *p_nextmsg = nextmsg + 1;
    
    if (!(template = template_findbyname(templatesym)))
    {
	error("canvas_read: %s: no such template", templatesym->s_name);
	*p_nextmsg = natoms;
	return (0);
    }
    sc = scalar_new(x, templatesym);
    if (!sc)
    {
	error("couldn't create scalar \"%s\"", templatesym->s_name);
	*p_nextmsg = natoms;
	return (0);
    }
    if (wasvis)
    {
    	    /* temporarily lie about vis flag while this is built */
    	glist_getcanvas(x)->gl_mapped = 0;
    }
    glist_add(x, &sc->sc_gobj);
    
    nline = canvas_scanbinbuf(natoms, vec, &message, p_nextmsg);
    glist_readatoms(x, natoms, vec, p_nextmsg, templatesym, sc->sc_vec, 
    	nline, vec + message);
    if (wasvis)
    {
    	    /* reset vis flag as before */
    	glist_getcanvas(x)->gl_mapped = 1;
	gobj_vis(&sc->sc_gobj, x, 1);
    }
    if (selectit)
    {
    	glist_select(x, &sc->sc_gobj);
    }
    return (1);
}

void glist_readfrombinbuf(t_glist *x, t_binbuf *b, char *filename, int selectem)
{
#ifdef ROCKBOX
    int natoms, nline, message, nextmsg = 0;
#else
    t_canvas *canvas = glist_getcanvas(x);
    int cr = 0, natoms, nline, message, nextmsg = 0, i, j, nitems;
#endif
    t_atom *vec;
#ifndef ROCKBOX
    t_gobj *gobj;
#endif

    natoms = binbuf_getnatom(b);
    vec = binbuf_getvec(b);

    
    	    /* check for file type */
    nline = canvas_scanbinbuf(natoms, vec, &message, &nextmsg);
    if (nline != 1 && vec[message].a_type != A_SYMBOL &&
    	strcmp(vec[message].a_w.w_symbol->s_name, "data"))
    {
    	pd_error(x, "%s: file apparently of wrong type", filename);
	binbuf_free(b);
	return;
    }
    	/* read in templates and check for consistency */
    while (1)
    {
    	t_template *newtemplate, *existtemplate;
	t_symbol *templatesym;
	t_atom *templateargs = getbytes(0);
	int ntemplateargs = 0, newnargs;
    	nline = canvas_scanbinbuf(natoms, vec, &message, &nextmsg);
	if (nline < 2)
	    break;
	else if (nline > 2)
	    canvas_readerror(natoms, vec, message, nline,
	    	"extra items ignored");
	else if (vec[message].a_type != A_SYMBOL ||
	    strcmp(vec[message].a_w.w_symbol->s_name, "template") ||
	    vec[message + 1].a_type != A_SYMBOL)
    	{
	    canvas_readerror(natoms, vec, message, nline,
	    	"bad template header");
	    continue;
	}
	templatesym = canvas_makebindsym(vec[message + 1].a_w.w_symbol);
	while (1)
	{
    	    nline = canvas_scanbinbuf(natoms, vec, &message, &nextmsg);
	    if (nline != 2 && nline != 3)
		break;
	    newnargs = ntemplateargs + nline;
	    templateargs = (t_atom *)t_resizebytes(templateargs,
	    	sizeof(*templateargs) * ntemplateargs,
		sizeof(*templateargs) * newnargs);
	    templateargs[ntemplateargs] = vec[message];
	    templateargs[ntemplateargs + 1] = vec[message + 1];
	    if (nline == 3)
	    	templateargs[ntemplateargs + 2] = vec[message + 2];
	    ntemplateargs = newnargs;
	}
	newtemplate = template_new(templatesym, ntemplateargs, templateargs);
	t_freebytes(templateargs, sizeof (*templateargs) * ntemplateargs);
    	if (!(existtemplate = template_findbyname(templatesym)))
	{
	    error("%s: template not found in current patch",
	    	templatesym->s_name);
	    template_free(newtemplate);
	    return;
	}
	if (!template_match(existtemplate, newtemplate))
	{
	    error("%s: template doesn't match current one",
	    	templatesym->s_name);
	    template_free(newtemplate);
	    return;
	}
	template_free(newtemplate);
    }
    while (nextmsg < natoms)
    {
    	glist_readscalar(x, natoms, vec, &nextmsg, selectem);
    }
}

static void glist_doread(t_glist *x, t_symbol *filename, t_symbol *format,
    int clearme)
{
    t_binbuf *b = binbuf_new();
    t_canvas *canvas = glist_getcanvas(x);
    int wasvis = glist_isvisible(canvas);
#ifdef ROCKBOX
    int cr = 0;
#else
    int cr = 0, natoms, nline, message, nextmsg = 0, i, j;
    t_atom *vec;
#endif

    if (!strcmp(format->s_name, "cr"))
    	cr = 1;
    else if (*format->s_name)
    	error("qlist_read: unknown flag: %s", format->s_name);
    
    if (binbuf_read_via_path(b, filename->s_name,
    	canvas_getdir(canvas)->s_name, cr))
    {
    	pd_error(x, "read failed");
	binbuf_free(b);
	return;
    }
    if (wasvis)
    	canvas_vis(canvas, 0);
    if (clearme)
    	glist_clear(x);
    glist_readfrombinbuf(x, b, filename->s_name, 0);
    if (wasvis)
    	canvas_vis(canvas, 1);
    binbuf_free(b);
}

void glist_read(t_glist *x, t_symbol *filename, t_symbol *format)
{
    glist_doread(x, filename, format, 1);
}

void glist_mergefile(t_glist *x, t_symbol *filename, t_symbol *format)
{
    glist_doread(x, filename, format, 0);
}

    /* read text from a "properties" window, called from a gfxstub set
    up in scalar_properties().  We try to restore the object; if successful
    we delete the scalar and put the new thing in its place on the list. */
void canvas_dataproperties(t_canvas *x, t_scalar *sc, t_binbuf *b)
{
    int ntotal, nnew, scindex;
    t_gobj *y, *y2 = 0, *newone, *oldone = 0;
    for (y = x->gl_list, ntotal = 0, scindex = -1; y; y = y->g_next)
    {
	if (y == &sc->sc_gobj)
	    scindex = ntotal, oldone = y;
    	ntotal++;
    }
    
    if (scindex == -1)
    	bug("data_properties: scalar disappeared");
    glist_readfrombinbuf(x, b, "properties dialog", 0);
    newone = 0;
    if (scindex >= 0)
    {
    	/* take the new object off the list */
    	if (ntotal)
	{
	    for(y = x->gl_list, nnew = 1; (y2 = y->g_next);
	    	y = y2, nnew++)
	    	    if (nnew == ntotal)
	    {
		newone = y2;
		y->g_next = y2->g_next;
		break;    
	    }
	}
	else newone = x->gl_list, x->gl_list = newone->g_next;
    }
    if (!newone)
    	error("couldn't update properties (perhaps a format problem?)");
    else if (!oldone)
    	bug("data_properties: couldn't find old element");
    else
    {
    	glist_delete(x, oldone);
	if (scindex > 0)
	{
	    for (y = x->gl_list, nnew = 1; y;
	    	y = y->g_next, nnew++)
	    	    if (nnew == scindex || !y->g_next)
	    {
		newone->g_next = y->g_next;
		y->g_next = newone;
		goto didit;
	    }
    	    bug("data_properties: can't reinsert");
	}
	else newone->g_next = x->gl_list, x->gl_list = newone;
    }
didit:
    ;
}

    /* ----------- routines to write data to a binbuf ----------- */

void canvas_doaddtemplate(t_symbol *templatesym, 
    int *p_ntemplates, t_symbol ***p_templatevec)
{
    int n = *p_ntemplates, i;
    t_symbol **templatevec = *p_templatevec;
    for (i = 0; i < n; i++)
    	if (templatevec[i] == templatesym)
	    return;
    templatevec = (t_symbol **)t_resizebytes(templatevec,
    	n * sizeof(*templatevec), (n+1) * sizeof(*templatevec));
    templatevec[n] = templatesym;
    *p_templatevec = templatevec;
    *p_ntemplates = n+1;
}

static void glist_writelist(t_gobj *y, t_binbuf *b);

void canvas_writescalar(t_symbol *templatesym, t_word *w, t_binbuf *b,
    int amarrayelement)
{
#ifndef ROCKBOX
    t_dataslot *ds;
#endif
    t_template *template = template_findbyname(templatesym);
    t_atom *a = (t_atom *)t_getbytes(0);
    int i, n = template->t_n, natom = 0;
    if (!amarrayelement)
    {
    	t_atom templatename;
	SETSYMBOL(&templatename, gensym(templatesym->s_name + 3));
    	binbuf_add(b, 1, &templatename);
    }
    if (!template)
    	bug("canvas_writescalar");
    	/* write the atoms (floats and symbols) */
    for (i = 0; i < n; i++)
    {
    	if (template->t_vec[i].ds_type == DT_FLOAT ||
	    template->t_vec[i].ds_type == DT_SYMBOL)
	{
	    a = (t_atom *)t_resizebytes(a,
	    	natom * sizeof(*a), (natom + 1) * sizeof (*a));
	    if (template->t_vec[i].ds_type == DT_FLOAT)
	    	SETFLOAT(a + natom, w[i].w_float);
	    else SETSYMBOL(a + natom,  w[i].w_symbol);
	    natom++;
	}
    }
    	/* array elements have to have at least something */
    if (natom == 0 && amarrayelement)
    	SETSYMBOL(a + natom,  &s_bang), natom++;
    binbuf_add(b, natom, a);
    binbuf_addsemi(b);
    t_freebytes(a, natom * sizeof(*a));
    for (i = 0; i < n; i++)
    {
    	if (template->t_vec[i].ds_type == DT_ARRAY)
	{
	    int j;
	    t_array *a = w[i].w_array;
	    int elemsize = a->a_elemsize, nitems = a->a_n;
	    t_symbol *arraytemplatesym = template->t_vec[i].ds_arraytemplate;
	    for (j = 0; j < nitems; j++)
	    	canvas_writescalar(arraytemplatesym,
		    (t_word *)(((char *)a->a_vec) + elemsize * j), b, 1);
    	    binbuf_addsemi(b);
    	}
	else if (template->t_vec[i].ds_type == DT_LIST)
	{
	    glist_writelist(w->w_list->gl_list, b);
    	    binbuf_addsemi(b);
    	}
    }
}

static void glist_writelist(t_gobj *y, t_binbuf *b)
{
    for (; y; y = y->g_next)
    {
    	if (pd_class(&y->g_pd) == scalar_class)
	{
	    canvas_writescalar(((t_scalar *)y)->sc_template,
	    	((t_scalar *)y)->sc_vec, b, 0);
	}
    }
}

    /* ------------ routines to write out templates for data ------- */

static void canvas_addtemplatesforlist(t_gobj *y,
    int  *p_ntemplates, t_symbol ***p_templatevec);

static void canvas_addtemplatesforscalar(t_symbol *templatesym,
    t_word *w, int *p_ntemplates, t_symbol ***p_templatevec)
{
    t_dataslot *ds;
    int i;
    t_template *template = template_findbyname(templatesym);
    canvas_doaddtemplate(templatesym, p_ntemplates, p_templatevec);
    if (!template)
    	bug("canvas_addtemplatesforscalar");
    else for (ds = template->t_vec, i = template->t_n; i--; ds++, w++)
    {
    	if (ds->ds_type == DT_ARRAY)
	{
	    int j;
	    t_array *a = w->w_array;
	    int elemsize = a->a_elemsize, nitems = a->a_n;
	    t_symbol *arraytemplatesym = ds->ds_arraytemplate;
	    canvas_doaddtemplate(arraytemplatesym, p_ntemplates, p_templatevec);
	    for (j = 0; j < nitems; j++)
	    	canvas_addtemplatesforscalar(arraytemplatesym,
		    (t_word *)(((char *)a->a_vec) + elemsize * j), 
		    	p_ntemplates, p_templatevec);
    	}
	else if (ds->ds_type == DT_LIST)
	    canvas_addtemplatesforlist(w->w_list->gl_list,
    	    	p_ntemplates, p_templatevec);
    }
}

static void canvas_addtemplatesforlist(t_gobj *y,
    int  *p_ntemplates, t_symbol ***p_templatevec)
{
    for (; y; y = y->g_next)
    {
    	if (pd_class(&y->g_pd) == scalar_class)
	{
	    canvas_addtemplatesforscalar(((t_scalar *)y)->sc_template,
	    	((t_scalar *)y)->sc_vec, p_ntemplates, p_templatevec);
	}
    }
}

    /* write all "scalars" in a glist to a binbuf. */
t_binbuf *glist_writetobinbuf(t_glist *x, int wholething)
{
    int i;
    t_symbol **templatevec = getbytes(0);
    int ntemplates = 0;
    t_gobj *y;
    t_binbuf *b = binbuf_new();

    for (y = x->gl_list; y; y = y->g_next)
    {
    	if ((pd_class(&y->g_pd) == scalar_class) &&
	    (wholething || glist_isselected(x, y)))
	{
	    canvas_addtemplatesforscalar(((t_scalar *)y)->sc_template,
	    	((t_scalar *)y)->sc_vec,  &ntemplates, &templatevec);
	}
    }
    binbuf_addv(b, "s;", gensym("data"));
    for (i = 0; i < ntemplates; i++)
    {
    	t_template *template = template_findbyname(templatevec[i]);
	int j, m = template->t_n;
	    /* drop "pd-" prefix from template symbol to print it: */
    	binbuf_addv(b, "ss;", gensym("template"),
	    gensym(templatevec[i]->s_name + 3));
	for (j = 0; j < m; j++)
	{
	    t_symbol *type;
	    switch (template->t_vec[j].ds_type)
	    {
	    	case DT_FLOAT: type = &s_float; break;
	    	case DT_SYMBOL: type = &s_symbol; break;
	    	case DT_ARRAY: type = gensym("array"); break;
	    	case DT_LIST: type = &s_list; break;
		default: type = &s_float; bug("canvas_write");
	    }
	    if (template->t_vec[j].ds_type == DT_ARRAY)
	    	binbuf_addv(b, "sss;", type, template->t_vec[j].ds_name,
		    gensym(template->t_vec[j].ds_arraytemplate->s_name + 3));
	    else binbuf_addv(b, "ss;", type, template->t_vec[j].ds_name);
    	}
	binbuf_addsemi(b);
    }
    binbuf_addsemi(b);
    	/* now write out the objects themselves */
    for (y = x->gl_list; y; y = y->g_next)
    {
    	if ((pd_class(&y->g_pd) == scalar_class) &&
	    (wholething || glist_isselected(x, y)))
	{
	    canvas_writescalar(((t_scalar *)y)->sc_template,
	    	((t_scalar *)y)->sc_vec,  b, 0);
	}
    }
    return (b);
}

static void glist_write(t_glist *x, t_symbol *filename, t_symbol *format)
{
#ifdef ROCKBOX
    int cr = 0;
#else
    int cr = 0, i;
#endif
    t_binbuf *b;
    char buf[MAXPDSTRING];
#ifndef ROCKBOX
    t_symbol **templatevec = getbytes(0);
    int ntemplates = 0;
    t_gobj *y;
#endif
    t_canvas *canvas = glist_getcanvas(x);
    canvas_makefilename(canvas, filename->s_name, buf, MAXPDSTRING);
    if (!strcmp(format->s_name, "cr"))
    	cr = 1;
    else if (*format->s_name)
    	error("qlist_read: unknown flag: %s", format->s_name);
    
    b = glist_writetobinbuf(x, 1);
    if (b)
    {
    	if (binbuf_write(b, buf, "", cr))
    	    error("%s: write failed", filename->s_name);
    	binbuf_free(b);
    }
}

/* ------ routines to save and restore canvases (patches) recursively. ----*/

    /* save to a binbuf, called recursively; cf. canvas_savetofile() which
    saves the document, and is only called on root canvases. */
static void canvas_saveto(t_canvas *x, t_binbuf *b)
{
    t_gobj *y;
    t_linetraverser t;
    t_outconnect *oc;
    	/* subpatch */
    if (x->gl_owner && !x->gl_env)
    {
    	binbuf_addv(b, "ssiiiisi;", gensym("#N"), gensym("canvas"),
    	    (t_int)(x->gl_screenx1),
    	    (t_int)(x->gl_screeny1),
    	    (t_int)(x->gl_screenx2 - x->gl_screenx1),
    	    (t_int)(x->gl_screeny2 - x->gl_screeny1),
    	    (*x->gl_name->s_name ? x->gl_name: gensym("(subpatch)")),
	    x->gl_mapped);
    }
	/* root or abstraction */
    else binbuf_addv(b, "ssiiiii;", gensym("#N"), gensym("canvas"),
    	    (t_int)(x->gl_screenx1),
    	    (t_int)(x->gl_screeny1),
    	    (t_int)(x->gl_screenx2 - x->gl_screenx1),
    	    (t_int)(x->gl_screeny2 - x->gl_screeny1),
    	    	x->gl_font);

    for (y = x->gl_list; y; y = y->g_next)
    	gobj_save(y, b);

    linetraverser_start(&t, x);
    while((oc = linetraverser_next(&t)))
    {
    	int srcno = canvas_getindex(x, &t.tr_ob->ob_g);
	int sinkno = canvas_getindex(x, &t.tr_ob2->ob_g);
    	binbuf_addv(b, "ssiiii;", gensym("#X"), gensym("connect"),
    	    srcno, t.tr_outno, sinkno, t.tr_inno);
    }
    	/* unless everything is the default (as in ordinary subpatches)
	print out a "coords" message to set up the coordinate systems */
    if (x->gl_isgraph || x->gl_x1 || x->gl_y1 ||
    	x->gl_x2 != 1 ||  x->gl_y2 != 1 || x->gl_pixwidth || x->gl_pixheight)
	    binbuf_addv(b, "ssfffffff;", gensym("#X"), gensym("coords"),
    		x->gl_x1, x->gl_y1,
    		x->gl_x2, x->gl_y2,
    		(float)x->gl_pixwidth, (float)x->gl_pixheight,
		(float)x->gl_isgraph);
}

    /* call this recursively to collect all the template names for
    a canvas or for the selection. */
static void canvas_collecttemplatesfor(t_canvas *x, int *ntemplatesp,
    t_symbol ***templatevecp, int wholething)
{
    t_gobj *y;

    for (y = x->gl_list; y; y = y->g_next)
    {
    	if ((pd_class(&y->g_pd) == scalar_class) &&
	    (wholething || glist_isselected(x, y)))
	    	canvas_addtemplatesforscalar(((t_scalar *)y)->sc_template,
	    	    ((t_scalar *)y)->sc_vec,  ntemplatesp, templatevecp);
	else if ((pd_class(&y->g_pd) == canvas_class) &&
	    (wholething || glist_isselected(x, y)))
	    	canvas_collecttemplatesfor((t_canvas *)y,
		    ntemplatesp, templatevecp, 1);
    }
}

    /* save the templates needed by a canvas to a binbuf. */
static void canvas_savetemplatesto(t_canvas *x, t_binbuf *b, int wholething)
{
    t_symbol **templatevec = getbytes(0);
    int i, ntemplates = 0;
#ifndef ROCKBOX
    t_gobj *y;
#endif
    canvas_collecttemplatesfor(x, &ntemplates, &templatevec, wholething);
    for (i = 0; i < ntemplates; i++)
    {
    	t_template *template = template_findbyname(templatevec[i]);
	int j, m = template->t_n;
	if (!template)
	{
	    bug("canvas_savetemplatesto");
	    continue;
    	}
	    /* drop "pd-" prefix from template symbol to print */
	binbuf_addv(b, "sss", &s__N, gensym("struct"),
	    gensym(templatevec[i]->s_name + 3));
	for (j = 0; j < m; j++)
	{
	    t_symbol *type;
	    switch (template->t_vec[j].ds_type)
	    {
	    	case DT_FLOAT: type = &s_float; break;
	    	case DT_SYMBOL: type = &s_symbol; break;
	    	case DT_ARRAY: type = gensym("array"); break;
	    	case DT_LIST: type = &s_list; break;
		default: type = &s_float; bug("canvas_write");
	    }
	    if (template->t_vec[j].ds_type == DT_ARRAY)
	    	binbuf_addv(b, "sss", type, template->t_vec[j].ds_name,
		    gensym(template->t_vec[j].ds_arraytemplate->s_name + 3));
	    else binbuf_addv(b, "ss", type, template->t_vec[j].ds_name);
    	}
	binbuf_addsemi(b);
    }
}

void canvas_reload(t_symbol *name, t_symbol *dir, t_gobj *except);

    /* save a "root" canvas to a file; cf. canvas_saveto() which saves the
    body (and which is called recursively.) */
static void canvas_savetofile(t_canvas *x, t_symbol *filename, t_symbol *dir)
{
    t_binbuf *b = binbuf_new();
    canvas_savetemplatesto(x, b, 1);
    canvas_saveto(x, b);
    if (binbuf_write(b, filename->s_name, dir->s_name, 0)) sys_ouch();
    else
    {
    	    /* if not an abstraction, reset title bar and directory */ 
    	if (!x->gl_owner)
	    canvas_rename(x, filename, dir);
	post("saved to: %s/%s", dir->s_name, filename->s_name);
    	canvas_dirty(x, 0);
	canvas_reload(filename, dir, &x->gl_gobj);
    }
    binbuf_free(b);
}

static void canvas_menusaveas(t_canvas *x)
{
#ifdef ROCKBOX
    (void) x;
#else /* ROCKBOX */
    t_canvas *x2 = canvas_getrootfor(x);
    sys_vgui("pdtk_canvas_saveas .x%x \"%s\" \"%s\"\n", x2,
    	x2->gl_name->s_name, canvas_getdir(x2)->s_name);
#endif /* ROCKBOX */
}

static void canvas_menusave(t_canvas *x)
{
    t_canvas *x2 = canvas_getrootfor(x);
    char *name = x2->gl_name->s_name;
    if (*name && strncmp(name, "Untitled", 8)
	    && (strlen(name) < 4 || strcmp(name + strlen(name)-4, ".pat")))
    	    canvas_savetofile(x2, x2->gl_name, canvas_getdir(x2));
    else canvas_menusaveas(x2);
}


void g_readwrite_setup(void)
{
    class_addmethod(canvas_class, (t_method)glist_write,
    	gensym("write"), A_SYMBOL, A_DEFSYM, A_NULL);
    class_addmethod(canvas_class, (t_method)glist_read,
    	gensym("read"), A_SYMBOL, A_DEFSYM, A_NULL);
    class_addmethod(canvas_class, (t_method)glist_mergefile,
    	gensym("mergefile"), A_SYMBOL, A_DEFSYM, A_NULL);
    class_addmethod(canvas_class, (t_method)canvas_savetofile,
    	gensym("savetofile"), A_SYMBOL, A_SYMBOL, 0);
    class_addmethod(canvas_class, (t_method)canvas_saveto,
    	gensym("saveto"), A_CANT, 0);
/* ------------------ from the menu ------------------------- */
    class_addmethod(canvas_class, (t_method)canvas_menusave,
    	gensym("menusave"), 0);
    class_addmethod(canvas_class, (t_method)canvas_menusaveas,
    	gensym("menusaveas"), 0);
}