lily/lily-guile.cc

   1 /*
   2   lily-guile.cc -- implement assorted guile functions
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--2004 Jan Nieuwenhuizen <janneke@gnu.org>
   7                  Han-Wen Nienhuys <hanwen@cs.uu.nl>
   8 */
   9
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <math.h>   /* isinf */
  14 #include <string.h> /* strdup, strchr */
  15 #include <ctype.h>
  16
  17 #include "lily-proto.hh"
  18 #include "version.hh"
  19
  20 /* MacOS S fix:
  21    source-file.hh includes cmath which undefines isinf and isnan
  22
  23    FIXME: #ifdef MACOS_X?
  24 */
  25 inline int my_isinf (Real r) { return isinf (r); }
  26 inline int my_isnan (Real r) { return isnan (r); }
  27
  28
  29 #include "libc-extension.hh"
  30 #include "lily-guile.hh"
  31 #include "main.hh"
  32 #include "file-path.hh"
  33 #include "warn.hh"
  34 #include "direction.hh"
  35 #include "offset.hh"
  36 #include "interval.hh"
  37 #include "pitch.hh"
  38 #include "dimensions.hh"
  39 #include "source-file.hh"
  40
  41 // #define TEST_GC
  42
  43 SCM
  44 ly_last (SCM list)
  45 {
  46   return ly_car (scm_last_pair (list));
  47 }
  48
  49
  50 SCM
  51 ly_write2scm (SCM s)
  52 {
  53   SCM port = scm_mkstrport (SCM_INUM0,
  54                             scm_make_string (SCM_INUM0, SCM_UNDEFINED),
  55                             SCM_OPN | SCM_WRTNG,
  56                             "ly_write2string");
  57   //  SCM write = scm_eval_3 (ly_symbol2scm ("write"), s, SCM_EOL);
  58   SCM write = scm_primitive_eval (ly_symbol2scm ("write"));
  59
  60   // scm_apply (write, port, SCM_EOL);
  61   scm_call_2 (write, s, port);
  62   return scm_strport_to_string (port);
  63 }
  64
  65
  66 SCM
  67 ly_quote_scm (SCM s)
  68 {
  69   return scm_list_n (ly_symbol2scm ("quote"), s, SCM_UNDEFINED);
  70 }
  71
  72 String
  73 ly_symbol2string (SCM s)
  74 {
  75   assert (ly_c_symbol_p (s));
  76   return String ((Byte*)SCM_STRING_CHARS (s), (int) SCM_STRING_LENGTH (s));
  77 }
  78
  79 String
  80 gulp_file_to_string (String fn)
  81 {
  82   String s = global_path.find (fn);
  83   if (s == "")
  84     {
  85       String e = _f ("can't find file: `%s'", fn);
  86       e += " ";
  87       e += _f ("(load path: `%s')", global_path.to_string ());
  88       error (e);
  89     }
  90   else if (verbose_global_b)
  91     progress_indication ("[" + s);
  92
  93   int n;
  94   char * str = gulp_file (s, &n);
  95   String result (str);
  96   delete[] str;
  97
  98   if (verbose_global_b)
  99     progress_indication ("]");
 100
 101   return result;
 102 }
 103
 104 LY_DEFINE (ly_gulp_file, "ly:gulp-file",
 105            1, 0, 0, (SCM name),
 106            "Read the file @var{name}, and return its contents in a string.  "
 107            "The file is looked up using the search path.")
 108 {
 109   SCM_ASSERT_TYPE (ly_c_string_p (name), name, SCM_ARG1, __FUNCTION__, "string");
 110   return scm_makfrom0str (gulp_file_to_string (ly_scm2string (name)).to_str0 ());
 111 }
 112
 113
 114 extern "C" {
 115   // maybe gdb 5.0 becomes quicker if it doesn't do fancy C++ typing?
 116 void
 117 ly_display_scm (SCM s)
 118 {
 119   scm_display (s, scm_current_output_port ());
 120   scm_newline (scm_current_output_port ());
 121 }
 122 };
 123
 124 String
 125 ly_scm2string (SCM s)
 126 {
 127   assert (ly_c_string_p (s));
 128
 129   char *p = SCM_STRING_CHARS (s);
 130   String r (p);
 131   return r;
 132 }
 133
 134 char *
 135 ly_scm2newstr (SCM str, size_t *lenp)
 136 {
 137   SCM_ASSERT_TYPE (ly_c_string_p (str), str, SCM_ARG1, __FUNCTION__, "string");
 138
 139   size_t len = SCM_STRING_LENGTH (str);
 140   if (char *new_str = (char *) malloc ((len + 1) * sizeof (char)))
 141     {
 142       memcpy (new_str, SCM_STRING_CHARS (str), len);
 143       new_str[len] = '\0';
 144
 145       if (lenp)
 146         *lenp = len;
 147
 148       return new_str;
 149     }
 150   return 0;
 151 }
 152
 153 SCM
 154 index_get_cell (SCM s, Direction d)
 155 {
 156
 157   assert (d);
 158   return (d == LEFT) ? ly_car (s) : ly_cdr (s);
 159 }
 160
 161 SCM
 162 index_set_cell (SCM s, Direction d, SCM v)
 163 {
 164   if (d == LEFT)
 165     scm_set_car_x (s, v);
 166   else if (d == RIGHT)
 167     scm_set_cdr_x (s, v);
 168   return s;
 169 }
 170
 171 LY_DEFINE (ly_warn, "ly:warn",
 172            1, 0, 0, (SCM str),
 173            "Scheme callable function to issue the warning @code{msg}.")
 174 {
 175   SCM_ASSERT_TYPE (ly_c_string_p (str), str, SCM_ARG1, __FUNCTION__, "string");
 176   progress_indication ("\n");
 177   warning ("lily-guile: " + ly_scm2string (str));
 178   return SCM_BOOL_T;
 179 }
 180
 181 LY_DEFINE (ly_dir_p, "ly:dir?",
 182            1, 0, 0, (SCM s),
 183           "type predicate. A direction is @code{-1}, @code{0} or "
 184            "@code{1}, where @code{-1} represents "
 185           "left or down and @code{1} represents right or up.")
 186 {
 187   if (ly_c_number_p (s))
 188     {
 189       int i = ly_scm2int (s);
 190       return (i>= -1 && i <= 1)  ? SCM_BOOL_T : SCM_BOOL_F;
 191     }
 192   return SCM_BOOL_F;
 193 }
 194
 195 bool
 196 is_number_pair (SCM p)
 197 {
 198   return ly_c_pair_p (p)
 199     && ly_c_number_p (ly_car (p)) && ly_c_number_p (ly_cdr (p));
 200 }
 201
 202 typedef void (*Void_fptr) ();
 203 Array<Void_fptr> *scm_init_funcs_;
 204
 205 void add_scm_init_func (void (*f) ())
 206 {
 207   if (!scm_init_funcs_)
 208     scm_init_funcs_ = new Array<Void_fptr>;
 209
 210   scm_init_funcs_->push (f);
 211 }
 212
 213 void
 214 ly_init_ly_module (void *)
 215 {
 216   for (int i=scm_init_funcs_->size () ; i--;)
 217     (scm_init_funcs_->elem (i)) ();
 218
 219   if (verbose_global_b)
 220     progress_indication ("\n");
 221
 222   scm_primitive_load_path (scm_makfrom0str ("lily.scm"));
 223 }
 224
 225 SCM global_lily_module;
 226
 227 void
 228 ly_c_init_guile ()
 229 {
 230   global_lily_module = scm_c_define_module ("lily", ly_init_ly_module, 0);
 231   scm_c_use_module ("lily");
 232 }
 233
 234 unsigned int
 235 ly_scm_hash (SCM s)
 236 {
 237   return scm_ihashv (s, ~1u);
 238 }
 239
 240 bool
 241 is_direction (SCM s)
 242 {
 243   if (ly_c_number_p (s))
 244     {
 245       int i = ly_scm2int (s);
 246       return i>= -1 && i <= 1;
 247     }
 248   return false;
 249 }
 250
 251 bool
 252 is_axis (SCM s)
 253 {
 254   if (ly_c_number_p (s))
 255     {
 256       int i = ly_scm2int (s);
 257       return i== 0 || i == 1;
 258     }
 259   return false;
 260 }
 261
 262 Direction
 263 to_dir (SCM s)
 264 {
 265   return SCM_INUMP (s) ? (Direction) ly_scm2int (s) : CENTER;
 266 }
 267
 268 Interval
 269 ly_scm2interval (SCM p)
 270 {
 271   return Interval (ly_scm2double (ly_car (p)), ly_scm2double (ly_cdr (p)));
 272 }
 273
 274 Drul_array<Real>
 275 ly_scm2realdrul (SCM p)
 276 {
 277   return Drul_array<Real> (ly_scm2double (ly_car (p)),
 278                            ly_scm2double (ly_cdr (p)));
 279 }
 280
 281 SCM
 282 ly_interval2scm (Drul_array<Real> i)
 283 {
 284   return scm_cons (scm_make_real (i[LEFT]), scm_make_real (i[RIGHT]));
 285 }
 286
 287 bool
 288 to_boolean (SCM s)
 289 {
 290   return ly_c_boolean_p (s) && ly_scm2bool (s);
 291 }
 292
 293 /* Appendable list L: the cdr contains the list, the car the last cons
 294    in the list.  */
 295 SCM
 296 appendable_list ()
 297 {
 298   SCM s = scm_cons (SCM_EOL, SCM_EOL);
 299   scm_set_car_x (s, s);
 300
 301   return s;
 302 }
 303
 304 void
 305 appendable_list_append (SCM l, SCM elt)
 306 {
 307   SCM newcons = scm_cons (elt, SCM_EOL);
 308
 309   scm_set_cdr_x (ly_car (l), newcons);
 310   scm_set_car_x (l, newcons);
 311 }
 312
 313 SCM
 314 ly_offset2scm (Offset o)
 315 {
 316   return scm_cons (scm_make_real (o[X_AXIS]), scm_make_real (o[Y_AXIS]));
 317 }
 318
 319 Offset
 320 ly_scm2offset (SCM s)
 321 {
 322   return Offset (ly_scm2double (ly_car (s)),
 323                  ly_scm2double (ly_cdr (s)));
 324 }
 325
 326 LY_DEFINE (ly_number2string, "ly:number->string",
 327            1, 0, 0, (SCM s),
 328            "Convert @var{num} to a string without generating many decimals.")
 329 {
 330   SCM_ASSERT_TYPE (ly_c_number_p (s), s, SCM_ARG1, __FUNCTION__, "number");
 331
 332   char str[400];                        // ugh.
 333
 334   if (scm_exact_p (s) == SCM_BOOL_F)
 335     {
 336       Real r (ly_scm2double (s));
 337
 338       if (my_isinf (r) || my_isnan (r))
 339         {
 340           programming_error ("Infinity or NaN encountered while converting Real number; setting to zero.");
 341           r = 0.0;
 342         }
 343
 344       sprintf (str, "%08.4f", r);
 345     }
 346   else
 347     sprintf (str, "%d", ly_scm2int (s));
 348
 349   return scm_makfrom0str (str);
 350 }
 351
 352
 353
 354 LY_DEFINE (ly_version,  "ly:version", 0, 0, 0, (),
 355           "Return the current lilypond version as a list, e.g. @code{(1 3 127 uu1)}. ")
 356 {
 357   char const* vs = "\'(" MAJOR_VERSION " " MINOR_VERSION " "  PATCH_LEVEL " " MY_PATCH_LEVEL ")" ;
 358
 359   return scm_c_eval_string ((char*)vs);
 360 }
 361
 362 LY_DEFINE (ly_unit,  "ly:unit", 0, 0, 0, (),
 363           "Return the unit used for lengths as a string.")
 364 {
 365   return scm_makfrom0str (INTERNAL_UNIT);
 366 }
 367
 368
 369
 370 LY_DEFINE (ly_dimension_p,  "ly:dimension?", 1, 0, 0, (SCM d),
 371           "Return @var{d} is a number. Used to distinguish length "
 372           "variables from normal numbers.")
 373 {
 374   return scm_number_p (d);
 375 }
 376
 377 SCM
 378 ly_deep_copy (SCM src)
 379 {
 380   if (ly_c_pair_p (src))
 381     return scm_cons (ly_deep_copy (ly_car (src)), ly_deep_copy (ly_cdr (src)));
 382   else if (ly_c_vector_p (src))
 383     {
 384       int len = SCM_VECTOR_LENGTH (src);
 385       SCM nv = scm_c_make_vector (len, SCM_UNDEFINED);
 386       for (int i  =0 ; i < len ; i++)
 387         {
 388           SCM si = scm_int2num (i);
 389           scm_vector_set_x (nv, si, ly_deep_copy (scm_vector_ref (src, si)));
 390         }
 391     }
 392   return src;
 393 }
 394
 395
 396
 397
 398 SCM
 399 ly_assoc_chain (SCM key, SCM achain)
 400 {
 401   if (ly_c_pair_p (achain))
 402     {
 403       SCM handle = scm_assoc (key, ly_car (achain));
 404       if (ly_c_pair_p (handle))
 405         return handle;
 406       else
 407         return ly_assoc_chain (key, ly_cdr (achain));
 408     }
 409   else
 410     return SCM_BOOL_F;
 411 }
 412
 413 /* looks the key up in the cdrs of the alist-keys
 414    - ignoring the car and ignoring non-pair keys.
 415    Returns first match found, i.e.
 416
 417    alist = ((1 . 10)
 418                    ((1 . 2) . 11)
 419                    ((2 . 1) . 12)
 420                    ((3 . 0) . 13)
 421                    ((4 . 1) . 14) )
 422
 423 I would like (ly_assoc_cdr 1) to return 12 - because it's the first
 424 element with the cdr of the key = 1.  In other words (alloc_cdr key)
 425 corresponds to call
 426
 427 (alloc (anything . key))
 428
 429
 430
 431 */
 432 SCM
 433 ly_assoc_cdr (SCM key, SCM alist)
 434 {
 435   if (ly_c_pair_p (alist))
 436     {
 437       SCM trykey = ly_caar (alist);
 438       if (ly_c_pair_p (trykey) && to_boolean (scm_equal_p (key, ly_cdr (trykey))))
 439         return ly_car (alist);
 440       else
 441         return ly_assoc_cdr (key, ly_cdr (alist));
 442     }
 443   return SCM_BOOL_F;
 444 }
 445
 446 /* LST has the form "sym1 sym2 sym3\nsym4\nsym5"
 447    i.e. \n and ' ' can be used interchangeably as separators.  */
 448 SCM
 449 parse_symbol_list (char const *lst)
 450 {
 451   char *s = strdup (lst);
 452   char *orig = s;
 453   SCM create_list = SCM_EOL;
 454
 455   char * e = s + strlen (s) - 1;
 456   while (e >= s && isspace (*e))
 457     *e-- = 0;
 458
 459   for (char * p = s; *p; p++)
 460     if (*p == '\n')
 461       *p = ' ';
 462
 463   if (!s[0])
 464     s = 0;
 465
 466   while (s)
 467     {
 468       char *next = strchr (s, ' ');
 469       if (next)
 470         *next++ = 0;
 471
 472       create_list = scm_cons (ly_symbol2scm (s), create_list);
 473       s = next;
 474     }
 475
 476   free (orig);
 477   return create_list;
 478 }
 479
 480 SCM
 481 ly_truncate_list (int k, SCM lst)
 482 {
 483   if (k == 0)
 484     lst = SCM_EOL;
 485   else
 486     {
 487       SCM s = lst;
 488       k--;
 489       for (; ly_c_pair_p (s) && k--; s = ly_cdr (s))
 490         ;
 491
 492       if (ly_c_pair_p (s))
 493         scm_set_cdr_x (s, SCM_EOL);
 494     }
 495   return lst;
 496 }
 497
 498 String
 499 print_scm_val (SCM val)
 500 {
 501   String realval = ly_scm2string (ly_write2scm (val));
 502   if (realval.length () > 200)
 503     realval = realval.left_string (100)
 504       + "\n :\n :\n"
 505       + realval.right_string (100);
 506   return realval;
 507 }
 508
 509 bool
 510 type_check_assignment (SCM sym, SCM val,  SCM type_symbol)
 511 {
 512   bool ok = true;
 513
 514   /*
 515     Always succeeds.
 516
 517
 518     TODO: should remove #f from allowed vals?
 519    */
 520   if (val == SCM_EOL || val == SCM_BOOL_F)
 521     return ok;
 522
 523   if (!ly_c_symbol_p (sym))
 524 #if 0
 525     return false;
 526 #else
 527   /*
 528     This is used for autoBeamSettings.
 529
 530     TODO: deprecate the use of \override and \revert for
 531     autoBeamSettings?
 532
 533     or use a symbol autoBeamSettingS?
 534    */
 535   return true;
 536 #endif
 537
 538   SCM type = scm_object_property (sym, type_symbol);
 539
 540   if (type != SCM_EOL && !ly_c_procedure_p (type))
 541       {
 542         warning (_f ("Can't find property type-check for `%s' (%s).",
 543                      ly_symbol2string (sym).to_str0 (),
 544                      ly_symbol2string (type_symbol).to_str0 ())
 545                  + "  " + _ ("Perhaps you made a typing error?"));
 546
 547         /* Be strict when being anal :) */
 548         if (internal_type_checking_global_b)
 549           abort ();
 550
 551         warning (_ ("Doing assignment anyway."));
 552       }
 553   else
 554     {
 555       if (val != SCM_EOL
 556           && ly_c_procedure_p (type)
 557           && scm_call_1 (type, val) == SCM_BOOL_F)
 558         {
 559           SCM errport = scm_current_error_port ();
 560           ok = false;
 561           SCM typefunc = ly_scheme_function ("type-name");
 562           SCM type_name = scm_call_1 (typefunc, type);
 563
 564
 565           scm_puts (_f ("Type check for `%s' failed; value `%s' must be of type `%s'",
 566                         ly_symbol2string (sym).to_str0 (),
 567                         print_scm_val (val),
 568                         ly_scm2string (type_name).to_str0 ()).to_str0 (),
 569                     errport);
 570           scm_puts ("\n", errport);
 571         }
 572     }
 573   return ok;
 574 }
 575
 576
 577 /* some SCM abbrevs
 578
 579    zijn deze nou handig?
 580    zijn ze er al in scheme, maar heten ze anders? */
 581
 582
 583 /* Remove doubles from (sorted) list */
 584 SCM
 585 ly_unique (SCM list)
 586 {
 587   SCM unique = SCM_EOL;
 588   for (SCM i = list; ly_c_pair_p (i); i = ly_cdr (i))
 589     {
 590       if (!ly_c_pair_p (ly_cdr (i))
 591           || !ly_c_equal_p (ly_car (i), ly_cadr (i)))
 592         unique = scm_cons (ly_car (i), unique);
 593     }
 594   return scm_reverse_x (unique, SCM_EOL);
 595 }
 596
 597
 598 static int
 599 scm_default_compare (void const *a, void const *b)
 600 {
 601   SCM pa = *(SCM*) a;
 602   SCM pb = *(SCM*) b;
 603   if (pa == pb)
 604     return 0;
 605   return pa < pb ? -1 : 1;
 606 }
 607
 608 /*  Modify LST in place: qsort it.  */
 609 SCM
 610 ly_list_qsort_uniq_x (SCM lst)
 611 {
 612   int len = scm_ilength (lst);
 613   SCM *arr = new SCM[len];
 614   int k = 0;
 615   for (SCM s = lst; SCM_NNULLP (s); s = SCM_CDR (s))
 616     arr[k++] = SCM_CAR (s);
 617
 618   assert (k == len);
 619   qsort (arr, len, sizeof (SCM), &scm_default_compare);
 620
 621   SCM *tail = &lst;
 622   for (int i = 0; i < len; i++)
 623     if (!i || arr[i] != arr[i - 1])
 624       {
 625         SCM_SETCAR (*tail, arr[i]);
 626         tail = SCM_CDRLOC (*tail);
 627       }
 628
 629   *tail = SCM_EOL;
 630   delete[] arr;
 631
 632   return lst;
 633 }
 634
 635
 636 /* tail add */
 637 SCM
 638 ly_snoc (SCM s, SCM list)
 639 {
 640   return ly_append2 (list, scm_list_n (s, SCM_UNDEFINED));
 641 }
 642
 643 /* Split list at member s, removing s.
 644    Return (BEFORE . AFTER)  */
 645 SCM
 646 ly_split_list (SCM s, SCM list)
 647 {
 648   SCM before = SCM_EOL;
 649   SCM after = list;
 650   for (; ly_c_pair_p (after);)
 651     {
 652       SCM i = ly_car (after);
 653       after = ly_cdr (after);
 654       if (ly_c_equal_p (i, s))
 655         break;
 656       before = scm_cons (i, before);
 657     }
 658   return scm_cons ( scm_reverse_x (before, SCM_EOL),  after);
 659
 660 }
 661
 662
 663 void
 664 taint (SCM *)
 665 {
 666   /*
 667     nop.
 668    */
 669 }
 670
 671 /*
 672   display stuff without using stack
 673  */
 674 SCM
 675 display_list (SCM s)
 676 {
 677   SCM p = scm_current_output_port ();
 678
 679   scm_puts ("(", p);
 680   for (; ly_c_pair_p (s); s =ly_cdr (s))
 681     {
 682       scm_display (ly_car (s), p);
 683       scm_puts (" ", p);
 684     }
 685   scm_puts (")", p);
 686   return SCM_UNSPECIFIED;
 687 }
 688
 689 Slice
 690 int_list_to_slice (SCM l)
 691 {
 692   Slice s;
 693   s.set_empty ();
 694   for (; ly_c_pair_p (l); l = ly_cdr (l))
 695     if (ly_c_number_p (ly_car (l)))
 696       s.add_point (ly_scm2int (ly_car (l)));
 697   return s;
 698 }
 699
 700 /* Return I-th element, or last elt L. If I < 0, then we take the first
 701    element.
 702
 703    PRE: length (L) > 0  */
 704 SCM
 705 robust_list_ref (int i, SCM l)
 706 {
 707   while (i-- > 0 && ly_c_pair_p (ly_cdr (l)))
 708     l = ly_cdr (l);
 709   return ly_car (l);
 710 }
 711
 712 Real
 713 robust_scm2double (SCM k, double x)
 714 {
 715   if (ly_c_number_p (k))
 716     x = ly_scm2double (k);
 717   return x;
 718 }
 719
 720 Interval
 721 robust_scm2interval (SCM k, Drul_array<Real> v)
 722 {
 723   Interval i;
 724   i[LEFT]= v[LEFT];
 725   i[RIGHT]= v[RIGHT];
 726   if (is_number_pair (k))
 727     i = ly_scm2interval (k);
 728   return i;
 729 }
 730
 731 Drul_array<Real>
 732 robust_scm2drul (SCM k, Drul_array<Real> v)
 733 {
 734   if (is_number_pair (k))
 735     v = ly_scm2interval (k);
 736   return v;
 737 }
 738
 739 Offset
 740 robust_scm2offset (SCM k, Offset o)
 741 {
 742   if (is_number_pair (k))
 743     o = ly_scm2offset (k);
 744   return o;
 745 }
 746
 747 int
 748 robust_scm2int (SCM k, int o)
 749 {
 750   if (scm_integer_p (k) == SCM_BOOL_T)
 751     o = ly_scm2int (k);
 752   return o;
 753 }
 754
 755 SCM
 756 alist_to_hashq (SCM alist)
 757 {
 758   int i = scm_ilength (alist);
 759   if (i < 0)
 760     return scm_make_vector (scm_int2num (0), SCM_EOL);
 761
 762   SCM tab = scm_make_vector (scm_int2num (i), SCM_EOL);
 763   for (SCM s = alist; ly_c_pair_p (s); s = ly_cdr (s))
 764     {
 765       SCM pt = ly_cdar (s);
 766       scm_hashq_set_x (tab, ly_caar (s), pt);
 767     }
 768   return tab;
 769 }
 770
 771 #if 1
 772 /*
 773   Debugging mem leaks:
 774  */
 775 LY_DEFINE (ly_protects, "ly:protects",
 776            0, 0, 0, (),
 777           "Return hash of protected objects.")
 778 {
 779   return scm_protects;
 780 }
 781 #endif
 782
 783
 784 #if HAVE_PANGO_FC_FONT_MAP_ADD_DECODER_FIND_FUNC
 785
 786 #include "pangofc-afm-decoder.hh"
 787
 788 LY_DEFINE (ly_pango_add_afm_decoder, "ly:pango-add-afm-decoder",
 789            1, 0, 0, (SCM font_family),
 790            "Add pango afm decoder for FONT-FAMILY.")
 791 {
 792   SCM_ASSERT_TYPE (ly_c_string_p (font_family), font_family, SCM_ARG1, __FUNCTION__, "font_family");
 793   pango_fc_afm_add_decoder (ly_scm2newstr (font_family, 0));
 794   return SCM_UNSPECIFIED;
 795 }
 796
 797 #endif