first commit for tclpd externalsvn2git-root

svn path=/trunk/externals/tclpd/; revision=8736

10 files changed, 989 insertions, 0 deletions

diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..2128a66
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,280 @@
+		    GNU GENERAL PUBLIC LICENSE

+		       Version 2, June 1991

+

+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.

+                       59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

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diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..5c97c54
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,38 @@
+#!/usr/bin/make
+
+CPU=athlon-xp
+CFLAGS += -I/usr/include -I. -xc++ -funroll-loops -fno-operator-names -fno-omit-frame-pointer -falign-functions=16 -mtune=$(CPU) -march=$(CPU) -Wall -Wno-unused -Wunused-variable -Wno-strict-aliasing -g -fPIC -I.
+LDSOFLAGS += -lm -L/usr/lib -ltcl8.5 -L/usr/X11R6/lib
+CXX = g++
+OS = linux
+LDSHARED = $(CXX) $(PDBUNDLEFLAGS)
+
+all:: tcl
+
+clean::
+	rm -f tcl.pd_linux tcl_wrap.cxx *.o *~
+
+.SUFFIXES:
+
+ifeq ($(OS),darwin)
+  PDSUF = .pd_darwin
+  PDBUNDLEFLAGS = -bundle -flat_namespace -undefined suppress
+else
+  ifeq ($(OS),nt)
+    PDSUF = .dll
+    PDBUNDLEFLAGS = -shared
+  else
+    PDSUF = .pd_linux
+    PDBUNDLEFLAGS = -shared -rdynamic
+  endif
+endif
+
+tcl:: tcl.pd_linux
+
+tcl.pd_linux: tcl_wrap.cxx tcl_extras.cxx tcl_loader.cxx tcl_extras.h Makefile
+	$(LDSHARED) $(CFLAGS) -DPDSUF=\"$(PDSUF)\" -o tcl$(PDSUF) \
+		tcl_wrap.cxx tcl_extras.cxx tcl_loader.cxx $(LDSOFLAGS)
+
+tcl_wrap.cxx: tcl.i tcl_extras.h
+	swig -v -c++ -tcl -o tcl_wrap.cxx -I/usr/include -I/usr/local/include tcl.i
+
diff --git a/README b/README
new file mode 100644
index 0000000..7a9e633
--- /dev/null
+++ b/README
@@ -0,0 +1,71 @@
+
+ Tcl for Pd
+ ==========
+
+this library allows you to to write externals for Pd using the
+Tcl language. despite tot/toxy/widget externals, Tcl code ran
+with tclpd actually runs in server (rather than gui process).
+
+this is a PRE-ALPHA release: it means something work, but don't
+expect to do serious things right now. also expect changes to
+the Tcl API and around.
+
+
+ Data conversion between Tcl <=> Pd
+ ==================================
+
+In pd exists 'atoms'. An atom is a float, a symbol, a list item,
+and such.
+Tcl does not have data types. In Tcl everything is a string,
+also numbers and lists. Just when something needs to be read as
+number, then evaluation comes in.
+This leads to loss of information about atom types. Imagine a
+symbol '456' comes into tclpd, you won't know anymore if "456"
+is a symbol or a float.
+
+Here a little convention comes in action: in tclpd an atom gets
+converted to a two-item list, where first item is atom type,
+and second item is its value.
+
+Some examples of conversion:
+
+ Pd:  456
+ Tcl: {float 456}
+
+ Pd:  symbol foo
+ Tcl: {symbol foo}
+
+ Pd:  list cat dog 123 456 weee
+ Tcl: {{symbol cat} {symbol dog} {float 123} {float 456} {symbol wee}}
+
+
+ Examples
+ ========
+
+I provided small examples.
+after loading pd with option '-lib tcl', just type the filename
+(minus the .tcl extension) to load the Tcl externals examples.
+
+actually there is one simple example: list_change (behaves like
+[change] object, but work with lists only)
+
+examples make use of pdlib.tcl, a little API I wrote to make
+things more cute.
+you are free to not use it (just look in pdlib.tcl to know what
+happens for real) or better: YOU ARE ENCOURAGED to write an OOP
+system for writing externals with tclpd.
+
+
+ Authors
+ =======
+
+ * Federico Ferri <mescalinum@gmail.com>
+ * Mathieu Bouchard <matju@artengine.ca>
+
+
+ License
+ =======
+
+See COPYING file provided with the package.
+
+
diff --git a/config.h b/config.h
new file mode 100644
index 0000000..c3bc2d3
--- /dev/null
+++ b/config.h
@@ -0,0 +1,4 @@
+#ifndef __CONFIG_H
+#define __CONFIG_H
+#include <tcl.h>
+#endif /* __CONFIG_H */
diff --git a/list_change.tcl b/list_change.tcl
new file mode 100644
index 0000000..34ffe9a
--- /dev/null
+++ b/list_change.tcl
@@ -0,0 +1,32 @@
+source pdlib.tcl
+
+pd::class list_change {
+#    inlet float
+    outlet list
+#    outlet float
+
+    constructor {
+        if [pd::args] {
+            set n [pd::arg_int 0]
+            for {set i 0} {$i < $n} {incr i} {
+                pd::add_inlet $self float
+            }
+        }
+        set @curlist {}
+    }
+
+    0_list {
+        set newlist $args
+        if {$newlist != $@curlist} {
+            pd::outlet $self 0 list $newlist
+        }
+        set @curlist $newlist
+
+        pd::outlet $self 1 float [pd::inlet $self 1]
+    }
+
+    0_bang {
+        pd::post "right value is: [pd::inlet $self 1]"
+    }
+}
+
diff --git a/pdlib.tcl b/pdlib.tcl
new file mode 100644
index 0000000..3ac00cd
--- /dev/null
+++ b/pdlib.tcl
@@ -0,0 +1,200 @@
+# TCL objectized library for PD api
+# by Federico Ferri <mescalinum@gmail.com> - 2007
+
+package provide pdlib 0.1
+
+package require Tcl 8.5
+
+set verbose 0
+
+namespace eval ::pd {
+
+    proc add_inlet {self sel} {
+        if $::verbose {post [info level 0]}
+        variable _
+        switch -- $sel {
+            float {
+                set ptr [new_t_float]
+                lappend _($self:p_inlet) $ptr
+                lappend _($self:x_inlet) [floatinlet_new [tclpd_get_object $self] $ptr]
+            }
+            symbol {
+                set ptr [new_t_symbol]
+                lappend _($self:p_inlet) $ptr
+                lappend _($self:x_inlet) [symbolinlet_new [tclpd_get_object $self] $ptr]
+            }
+            default {
+                post "inlet creation error: unsupported selector: $sel"
+                return {}
+            }
+        }
+        return [lindex $_($self:x_inlet) end]
+    }
+
+    proc inlet {self n} {
+        if {$::verbose} {post [info level 0]}
+        if {$n <= 0} {return {}}
+        if {![info exists _($self:p_inlet)] ||
+            $n >= [llength $_($self:p_inlet)]} {
+            return -code error "pdlib: error: no such inlet: $n"
+        }
+        variable _
+        return [[lindex $_($self:p_inlet) [expr $n-1]] value]
+    }
+
+    proc add_outlet {self sel} {
+        if $::verbose {post [info level 0]}
+        variable _
+        switch -- $sel {
+            float {
+                lappend _($self:x_outlet) \
+                    [outlet_new [tclpd_get_object $self] [gensym "float"]]
+            }
+            symbol {
+                lappend _($self:x_outlet) \
+                    [outlet_new [tclpd_get_object $self] [gensym "symbol"]]
+            }
+            list {
+                lappend _($self:x_outlet) \
+                    [outlet_new [tclpd_get_object $self] [gensym "list"]]
+            }
+            default {
+                return -code error \
+                "pdlib: outlet creation error: unsupported selector: $sel"
+            }
+        }
+        return [lindex $_($self:x_outlet) end]
+    }
+
+    proc outlet {self n sel args} {
+        if $::verbose {post [info level 0]}
+        variable _
+        set outlet [lindex $_($self:x_outlet) $n]
+        switch -- $sel {
+            float {
+                set v [lindex $args 0]
+                outlet_float $outlet $v
+            }
+            symbol {
+                set v [lindex $args 0]
+                outlet_symbol $outlet $v
+            }
+            list {
+                set v [lindex $args 0]
+                set sz [llength $v]
+                set aa [new_atom_array $sz]
+                for {set i 0} {$i < $sz} {incr i} {
+                    set_atom_array $aa $i [lindex $v $i]
+                }
+                outlet_list $outlet [gensym "list"] $sz $aa
+                delete_atom_array $aa $sz
+            }
+            bang {
+                outlet_bang $outlet
+            }
+            default {
+                return -code error "pdlib: outlet: unknown selector: $sel"
+            }
+        }
+    }
+
+    proc create_iolets {cn self} {
+        if $::verbose {post [info level 0]}
+        variable class_db
+        variable _
+        set _($self:p_inlet) {}
+        set _($self:x_inlet) {}
+        set _($self:x_outlet) {}
+        for {set i 0} {$i < [llength $class_db($cn:d_inlet)]} {incr i} {
+            add_inlet $self [lindex $class_db($cn:d_inlet) $i]
+        }
+        for {set i 0} {$i < [llength $class_db($cn:d_outlet)]} {incr i} {
+            add_outlet $self [lindex $class_db($cn:d_outlet) $i]
+        }
+    }
+
+    proc call_classmethod {classname self sel args} {
+        if $::verbose {post [info level 0]}
+        set m "${classname}_${sel}"
+        if {[llength [info commands "::$m"]] > 0} {
+            return [$m $self {*}$args]
+        }
+    }
+
+    proc class {classname def} {
+        variable class_db
+        array set class_db {}
+        set class_db($classname:d_inlet) {}
+        set class_db($classname:d_outlet) {}
+        set def2 [regsub -all -line {#.*$} $def {}]
+        foreach {id arg} $def2 {
+            switch -- $id {
+                inlet {
+                    lappend class_db($classname:d_inlet) $arg
+                }
+                outlet {
+                    lappend class_db($classname:d_outlet) $arg
+                }
+                default {
+                    proc ::${classname}_${id} {self args} \
+                        "global _; [expand_macros $arg]"
+                }
+            }
+        }
+
+        proc ::$classname {self args} "
+            ::pd::create_iolets $classname \$self
+            ::pd::call_classmethod $classname \$self constructor {*}\$args
+            proc ::\$self {selector args} \"
+             ::pd::call_classmethod $classname \$self \\\$selector {*}\\\$args
+            \"
+            return \$self
+        "
+
+        tclpd_class_new $classname 3
+    }
+
+    proc expand_macros {body} {
+        # from poe.tcl by Mathieu Bouchard
+        return [regsub -all @(\\\$?\[\\w\\?\]+) $body _(\$self:\\1)]
+    }
+
+    proc post {args} {
+        poststring2 [concat {*}$args]
+    }
+
+    proc assert= {a b} {
+        if {$a != $b} {
+            post "ASSERTION FAILED: \"$a\" == \"$b\""
+            return 0
+        }
+        return 1
+    }
+
+    proc args {} {
+        return [uplevel 1 "llength \$args"]
+    }
+
+    proc arg_float {n} {
+        set v [uplevel 1 "lindex \$args $n"]
+        foreach {selector value} $v {break}
+        assert= $selector "float"
+        return $value
+    }
+
+    proc arg_int {n} {
+        set v [uplevel 1 "lindex \$args $n"]
+        foreach {selector value} $v {break}
+        assert= $selector "float"
+        return [expr {int($value)}]
+    }
+
+    proc arg_symbol {n} {
+        set v [uplevel 1 "lindex \$args $n"]
+        foreach {selector value} $v {break}
+        assert= $selector "symbol"
+        return $value
+    }
+
+}
+
diff --git a/tcl.i b/tcl.i
new file mode 100644
index 0000000..7d67031
--- /dev/null
+++ b/tcl.i
@@ -0,0 +1,200 @@
+%module tclpd
+%include exception.i
+%include cpointer.i
+
+/* functions that are in m_pd.h but don't exist in modern versions of pd */
+%ignore pd_getfilename;
+%ignore pd_getdirname;
+%ignore pd_anything;
+%ignore class_parentwidget;
+%ignore sys_isreadablefile;
+%ignore garray_get;
+%ignore c_extern;
+%ignore c_addmess;
+
+/* functions that are only in Miller's pd, not in devel_0_39/DesireData */
+%ignore sys_idlehook;
+
+/* functions that are not supported by DesireData */
+%ignore class_getpropertiesfn;
+%ignore class_setpropertiesfn;
+%ignore class_getwidget;
+%ignore class_setwidget;
+%ignore sys_fontwidth;
+%ignore sys_fontheight;
+%ignore sys_queuegui;
+%ignore sys_unqueuegui;
+%ignore sys_pretendguibytes;
+%ignore class_setparentwidget;
+%ignore pd_getparentwidget;
+%ignore getzbytes;
+%ignore gfxstub_new;
+%ignore gfxstub_deleteforkey;
+%ignore glist_grab;
+
+/* functions that we can't auto-wrap, because they have varargs */
+%ignore post;
+%ignore class_new;
+
+/* end of ignore-list */
+
+%include "m_pd.h"
+%include "tcl_extras.h"
+
+%{
+#include "m_pd.h"
+
+typedef t_atom t_atom_array;
+%}
+
+%name(outlet_list) EXTERN void outlet_list(t_outlet *x, t_symbol *s, int argc, t_atom_array *argv);
+
+%pointer_class(t_float, t_float)
+%pointer_class(t_symbol, t_symbol)
+
+%{
+#include "tcl_extras.h"
+
+#include <unistd.h>
+#include "config.h"
+
+Tcl_Interp *tcl_for_pd = 0;
+
+extern "C" SWIGEXPORT int Tclpd_SafeInit(Tcl_Interp *interp);
+
+extern "C" void tcl_setup (void) {
+  /* Pd initialization */
+
+  if (tcl_for_pd) {
+    post("Tcl: already loaded");
+    return;
+  }
+  post("Tcl external v0.1-alpha - 09.2007");
+  post("by Federico Ferri <mescalinum@gmail.com>, Mathieu Bouchard <matju@artengine.ca>");
+  tcl_for_pd = Tcl_CreateInterp();
+  Tcl_Init(tcl_for_pd);
+  Tclpd_SafeInit(tcl_for_pd);
+
+  char *dirname   = new char[242];
+  char *dirresult = new char[242];
+  /* nameresult is only a pointer in dirresult space so don't delete[] it. */
+  char *nameresult;
+  if (getcwd(dirname,242)<0) {post("AAAARRRRGGGGHHHH!"); exit(69);}
+  int       fd=open_via_path(dirname,"gridflow/tcl",PDSUF,dirresult,&nameresult,242,1);
+  if (fd<0) fd=open_via_path(dirname,         "tcl",PDSUF,dirresult,&nameresult,242,1);
+  if (fd>=0) {
+    close(fd);
+  } else {
+    post("%s was not found via the -path!","tcl"PDSUF);
+  }
+  Tcl_SetVar(tcl_for_pd,"DIR",dirresult,0);
+  Tcl_Eval(tcl_for_pd,"set auto_path [concat [list $DIR/.. $DIR $DIR/optional/rblti] $auto_path]");
+
+  if (Tcl_Eval(tcl_for_pd,"source $DIR/tcl.tcl") == TCL_OK)
+    post("Tcl: loaded %s/tcl.tcl", dirresult);
+
+  if (Tcl_Eval(tcl_for_pd,"source $env(HOME)/.pd.tcl") == TCL_OK)
+    post("Tcl: loaded ~/.pd.tcl");
+
+  delete[] dirresult;
+  delete[] dirname;
+
+  post("Tcl: registering tcl loader");
+  sys_register_loader(tclpd_do_load_lib);
+}
+
+int tcl_to_pd(Tcl_Obj *input, t_atom *output) {
+  int llength;
+  if(Tcl_ListObjLength(tcl_for_pd, input, &llength) == TCL_ERROR)
+    return TCL_ERROR;
+  if(llength != 2)
+    /*SWIG_exception(SWIG_ValueError, "Bad t_atom: expeting a 2-elements list.");*/
+    return TCL_ERROR;
+
+  int i;
+  Tcl_Obj* obj[2];
+  for(i = 0; i < 2; i++) Tcl_ListObjIndex(tcl_for_pd, input, i, &obj[i]);
+  char* argv0 = Tcl_GetStringFromObj(obj[0], 0);
+
+  if(strcmp(argv0, "float") == 0) {
+    double dbl;
+    if(Tcl_GetDoubleFromObj(tcl_for_pd, obj[1], &dbl) == TCL_ERROR)
+      return TCL_ERROR;
+    SETFLOAT(output, dbl);
+  } else if(strcmp(argv0, "symbol") == 0) {
+    SETSYMBOL(output, gensym(Tcl_GetStringFromObj(obj[1], 0)));
+  } else if(strcmp(argv0, "pointer") == 0) {
+    // TODO:
+  }
+  return TCL_OK;
+}
+
+int pd_to_tcl(t_atom *input, Tcl_Obj **output) {
+  Tcl_Obj* tcl_t_atom[2];
+  /*post("pd_to_tcl got an atom of type %d (%s)",
+    input->a_type, input->a_type == A_FLOAT ? "A_FLOAT" :
+    input->a_type == A_SYMBOL ? "A_SYMBOL" :
+    input->a_type == A_POINTER ? "A_POINTER" : "?");*/
+  switch (input->a_type) {
+    case A_FLOAT: {
+      tcl_t_atom[0] = Tcl_NewStringObj("float", -1);
+      tcl_t_atom[1] = Tcl_NewDoubleObj(input->a_w.w_float);
+      break;
+    }
+    case A_SYMBOL: {
+      tcl_t_atom[0] = Tcl_NewStringObj("symbol", -1);
+      tcl_t_atom[1] = Tcl_NewStringObj(input->a_w.w_symbol->s_name, strlen(input->a_w.w_symbol->s_name));
+      break;
+    }
+    case A_POINTER: {
+      tcl_t_atom[0] = Tcl_NewStringObj("pointer", -1);
+      tcl_t_atom[1] = Tcl_NewDoubleObj((long)input->a_w.w_gpointer);
+      break;
+    }
+    default: {
+      tcl_t_atom[0] = Tcl_NewStringObj("?", -1);
+      tcl_t_atom[1] = Tcl_NewStringObj("", 0);
+      break;
+    }
+  }
+  *output = Tcl_NewListObj(2, &tcl_t_atom[0]);
+  return TCL_OK;
+}
+
+%}
+
+%typemap(in) t_atom * {
+  t_atom *a = (t_atom*)getbytes(sizeof(t_atom));
+  if(tcl_to_pd($input, a) == TCL_ERROR)
+    return TCL_ERROR;
+  $1 = a;
+}
+
+%typemap(freearg) t_atom * {
+  freebytes($1, sizeof(t_atom));
+}
+
+%typemap(out) t_atom* {
+  Tcl_Obj* res_obj;
+  if(pd_to_tcl($1, &res_obj) == TCL_ERROR)
+    return TCL_ERROR;
+  Tcl_SetObjResult(tcl_for_pd, res_obj);
+}
+
+/* helper functions for t_atom arrays */
+%inline %{
+t_atom_array *new_atom_array(int size) {
+  return (t_atom_array*)getbytes(size*sizeof(t_atom));
+}
+void delete_atom_array(t_atom_array *a, int size) {
+  freebytes(a, size*sizeof(t_atom));
+}
+t_atom* get_atom_array(t_atom_array *a, int index) {
+  return &a[index];
+}
+void set_atom_array(t_atom_array *a, int index, t_atom *n) {
+  memcpy(&a[index], n, sizeof(t_atom));
+}
+%}
+
+
diff --git a/tcl_extras.cxx b/tcl_extras.cxx
new file mode 100644
index 0000000..556546f
--- /dev/null
+++ b/tcl_extras.cxx
@@ -0,0 +1,81 @@
+#include "tcl_extras.h"
+#include <map>
+#include <string>
+
+using namespace std;
+
+static long cereal=0;
+map<string,t_class*> class_table;
+map<string,t_pd*> object_table;
+
+void poststring2 (const char *s) {post("%s",s);}
+
+static void *tclpd_init (t_symbol *classsym, int ac, t_atom *at) {
+  const char *name = classsym->s_name;
+  t_class *qlass = class_table[string(name)];
+  t_tcl *self = (t_tcl *)pd_new(qlass);
+  char s[32];
+  sprintf(s,"pd%06lx",cereal++);
+  self->self = Tcl_NewStringObj(s,strlen(s));
+  object_table[string(s)] = (t_pd*)self;
+  Tcl_IncrRefCount(self->self);
+  Tcl_Obj *av[ac+2];
+  av[0] = Tcl_NewStringObj(name,strlen(name));
+  av[1] = self->self;
+  for(int i=0; i<ac; i++) {
+    if(pd_to_tcl(&at[i], &av[2+i]) == TCL_ERROR) {
+      post("tcl error: %s\n", Tcl_GetString(Tcl_GetObjResult(tcl_for_pd)));
+      pd_free((t_pd *)self);
+      return 0;
+    }
+  }
+  if (Tcl_EvalObjv(tcl_for_pd,ac+2,av,0) != TCL_OK) {
+    post("tcl error: %s\n", Tcl_GetString(Tcl_GetObjResult(tcl_for_pd)));
+    pd_free((t_pd *)self);
+    return 0;
+  }
+  return self;
+}
+
+t_pd* tclpd_get_instance(const char* cereal) {
+  return object_table[cereal];
+}
+
+t_object* tclpd_get_object(const char* cereal) {
+  t_tcl* x = (t_tcl*)tclpd_get_instance(cereal);
+  return &x->o;
+}
+
+t_pd* tclpd_get_object_pd(const char* cereal) {
+  t_object* o = tclpd_get_object(cereal);
+  return &o->ob_pd;
+}
+
+static void tclpd_anything (t_tcl *self, t_symbol *s, int ac, t_atom *at) {
+  /* proxy method */
+  Tcl_Obj *av[ac+2];
+  av[0] = self->self;
+  av[1] = Tcl_NewIntObj(0); // TODO: 0 -> outlet_number
+  Tcl_AppendToObj(av[1],"_",1);
+  Tcl_AppendToObj(av[1],s->s_name,strlen(s->s_name)); // selector
+  for(int i=0; i<ac; i++) {
+    if(pd_to_tcl(&at[i], &av[2+i]) == TCL_ERROR) {
+      post("tcl error: %s\n", Tcl_GetString(Tcl_GetObjResult(tcl_for_pd)));
+      return;
+    }
+  }
+  if (Tcl_EvalObjv(tcl_for_pd,ac+2,av,0) != TCL_OK)
+    post("tcl error: %s\n", Tcl_GetString(Tcl_GetObjResult(tcl_for_pd)));
+}
+
+static void tclpd_free (t_tcl *self) {
+  post("tclpd_free called");
+}
+
+t_class *tclpd_class_new (char *name, int flags) {
+  t_class *qlass = class_new(gensym(name), (t_newmethod) tclpd_init,
+    (t_method) tclpd_free, sizeof(t_tcl), flags, A_GIMME, A_NULL);
+  class_table[string(name)] = qlass;
+  class_addanything(qlass,tclpd_anything);
+  return qlass;
+}
diff --git a/tcl_extras.h b/tcl_extras.h
new file mode 100644
index 0000000..16cc31c
--- /dev/null
+++ b/tcl_extras.h
@@ -0,0 +1,28 @@
+#include "m_pd.h"
+#include <tcl.h>
+
+typedef struct t_tcl {
+  t_object o;
+  Tcl_Obj *self;
+} t_tcl;
+
+void         poststring2          (const char* s);
+
+t_class*     tclpd_class_new      (char* name, int flags);
+t_pd*        tclpd_get_instance   (const char* cereal);
+t_object*    tclpd_get_object     (const char* cereal);
+t_pd*        tclpd_get_object_pd  (const char* cereal);
+
+int          pd_to_tcl            (t_atom* input, Tcl_Obj** output);
+int          tcl_to_pd            (Tcl_Obj* input, t_atom* output);
+
+extern Tcl_Interp *tcl_for_pd;
+
+/* tcl loader */
+typedef int (*loader_t)(t_canvas *canvas, char *classname);
+extern "C" void sys_register_loader(loader_t loader);
+extern "C" int sys_onloadlist(char *classname);
+extern "C" void sys_putonloadlist(char *classname);
+extern "C" void class_set_extern_dir(t_symbol *s);
+extern "C" int tclpd_do_load_lib    (t_canvas *canvas, char *objectname);
+
diff --git a/tcl_loader.cxx b/tcl_loader.cxx
new file mode 100644
index 0000000..47d8cc0
--- /dev/null
+++ b/tcl_loader.cxx
@@ -0,0 +1,55 @@
+#include "tcl_extras.h"
+#include <string.h>
+#include <unistd.h>
+
+extern "C" int tclpd_do_load_lib(t_canvas *canvas, char *objectname)
+{
+    char filename[MAXPDSTRING], dirbuf[MAXPDSTRING],
+        *classname, *nameptr;
+    int fd;
+    if (classname = strrchr(objectname, '/'))
+        classname++;
+    else classname = objectname;
+    if (sys_onloadlist(objectname))
+    {
+        post("%s: already loaded", objectname);
+        return (1);
+    }
+        /* try looking in the path for (objectname).(tcl) ... */
+    if ((fd = canvas_open(canvas, objectname, ".tcl",
+        dirbuf, &nameptr, MAXPDSTRING, 1)) >= 0)
+            goto gotone;
+        /* next try (objectname)/(classname).(sys_dllextent) ... */
+    strncpy(filename, objectname, MAXPDSTRING);
+    filename[MAXPDSTRING-2] = 0;
+    strcat(filename, "/");
+    strncat(filename, classname, MAXPDSTRING-strlen(filename));
+    filename[MAXPDSTRING-1] = 0;
+    if ((fd = canvas_open(canvas, filename, ".tcl",
+        dirbuf, &nameptr, MAXPDSTRING, 1)) >= 0)
+            goto gotone;
+    //post("Tcl_loader: tried and failed");
+    return (0);
+gotone:
+    close(fd);
+    class_set_extern_dir(gensym(dirbuf));
+        /* rebuild the absolute pathname */
+    strncpy(filename, dirbuf, MAXPDSTRING);
+    filename[MAXPDSTRING-2] = 0;
+    strcat(filename, "/");
+    strncat(filename, nameptr, MAXPDSTRING-strlen(filename));
+    filename[MAXPDSTRING-1] = 0;
+
+    // load tcl:
+    char b[MAXPDSTRING+10];
+    snprintf(&b[0], MAXPDSTRING+10, "source %s", filename);
+    if (Tcl_Eval(tcl_for_pd,b) == TCL_OK)
+        post("Tcl_loader: loaded %s", b);
+    else
+        post("Tcl_loader: error trying to load %s", b);
+
+    class_set_extern_dir(&s_);
+    sys_putonloadlist(objectname);
+    return (1);
+}
+