+ return ly_string2scm (lilypond_datadir);
+}
+
+LY_DEFINE (ly_chain_assoc_get, "ly:chain-assoc-get",
+ 2, 1, 0, (SCM key, SCM achain, SCM dfault),
+ "Return value for @var{key} from a list of alists @var{achain}. "
+ "If no if no entry is found, return DFAULT, "
+ "or #f if no DFAULT not specified.")
+{
+ if (scm_is_pair (achain))
+ {
+ SCM handle = scm_assoc (key, scm_car (achain));
+ if (scm_is_pair (handle))
+ return scm_cdr (handle);
+ else
+ return ly_chain_assoc_get (key, scm_cdr (achain), dfault);
+ }
+ return dfault == SCM_UNDEFINED ? SCM_BOOL_F : dfault;
+}
+
+
+LY_DEFINE (ly_stderr_redirect, "ly:stderr-redirect",
+ 1, 1, 0, (SCM file_name, SCM mode),
+ "Redirect stderr to FILE-NAME, opened with MODE.")
+{
+ LY_ASSERT_TYPE (scm_is_string, file_name, 1);
+
+ string m = "w";
+ if (mode != SCM_UNDEFINED && scm_string_p (mode))
+ m = ly_scm2string (mode);
+ /* dup2 and (fileno (current-error-port)) do not work with mingw'c
+ gcc -mwindows. */
+ fflush (stderr);
+ freopen (ly_scm2string (file_name).c_str (), m.c_str (), stderr);
+ return SCM_UNSPECIFIED;
+}
+
+static SCM
+accumulate_symbol (void *closure, SCM key, SCM val, SCM result)
+{
+ (void) closure;
+ (void) val;
+ return scm_cons (key, result);
+}
+
+LY_DEFINE (ly_hash_table_keys, "ly:hash-table-keys",
+ 1,0,0, (SCM tab),
+ "return a list of keys in @var{tab}")
+{
+ return scm_internal_hash_fold ((Hash_closure_function) & accumulate_symbol,
+ NULL, SCM_EOL, tab);
+}
+
+LY_DEFINE (ly_camel_case_2_lisp_identifier, "ly:camel-case->lisp-identifier",
+ 1, 0, 0, (SCM name_sym),
+ "Convert FooBar_Bla to foo-bar-bla style symbol.")
+{
+ LY_ASSERT_TYPE (ly_is_symbol, name_sym, 1);
+
+ /*
+ TODO: should use strings instead?
+ */
+
+ const string in = ly_symbol2string (name_sym);
+ string result = camel_case_to_lisp_identifier (in);
+
+ return ly_symbol2scm (result.c_str ());
+}
+
+LY_DEFINE (ly_expand_environment, "ly:expand-environment",
+ 1, 0, 0, (SCM str),
+ "Expand $VAR and $@{VAR@} in @var{str}.")
+{
+ LY_ASSERT_TYPE (scm_is_string, str, 1);
+
+ return ly_string2scm (expand_environment_variables (ly_scm2string (str)));
+}
+
+
+LY_DEFINE (ly_truncate_list_x, "ly:truncate-list!",
+ 2, 0, 0, (SCM lst, SCM i),
+ "Take at most the first @var{i} of list @var{lst}")
+{
+ LY_ASSERT_TYPE (scm_is_integer, i, 1);
+
+ int k = scm_to_int (i);
+ if (k == 0)
+ lst = SCM_EOL;
+ else
+ {
+ SCM s = lst;
+ k--;
+ for (; scm_is_pair (s) && k--; s = scm_cdr (s))
+ ;
+
+ if (scm_is_pair (s))
+ scm_set_cdr_x (s, SCM_EOL);
+ }
+ return lst;
+}
+
+string
+format_single_argument (SCM arg, int precision)
+{
+ if (scm_is_integer (arg) && scm_exact_p (arg) == SCM_BOOL_T)
+ return (String_convert::int_string (scm_to_int (arg)));
+ else if (scm_is_number (arg))
+ {
+ Real val = scm_to_double (arg);
+
+ if (isnan (val) || isinf (val))
+ {
+ warning (_ ("Found infinity or nan in output. Substituting 0.0"));
+ return ("0.0");
+ if (strict_infinity_checking)
+ abort ();
+ }
+ else
+ return (String_convert::form_string ("%.*lf", precision, val));
+ }
+ else if (scm_is_string (arg))
+ return (ly_scm2string (arg));
+ else if (scm_is_symbol (arg))
+ return (ly_symbol2string (arg));
+ else
+ {
+ ly_progress (scm_from_locale_string ("Unsupported SCM value for format: ~a"),
+ scm_list_1 (arg));
+ }
+
+
+ return "";