X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fgeneral-scheme.cc;h=1168ee947357b06d21e0099b7a7551b09a6fd9a6;hb=760406bea561a45cc2d578ab29b4871c927aab23;hp=1cb51a10ff27b34cea174434eee275511b1fa529;hpb=8f5cd22af76fcb5c77853a5ede8b94ebef97caef;p=lilypond.git diff --git a/lily/general-scheme.cc b/lily/general-scheme.cc index 1cb51a10ff..1168ee9473 100644 --- a/lily/general-scheme.cc +++ b/lily/general-scheme.cc @@ -1,41 +1,79 @@ /* - lily-guile.cc -- implement assorted Guile bindings + This file is part of LilyPond, the GNU music typesetter. - source file of the GNU LilyPond music typesetter - - (c) 1998--2006 Jan Nieuwenhuizen + Copyright (C) 1998--2015 Jan Nieuwenhuizen Han-Wen Nienhuys + + LilyPond is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + LilyPond is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with LilyPond. If not, see . */ #include "config.hh" #include +#include #include /* memset */ +#include using namespace std; +#include "dimensions.hh" +#include "file-name.hh" +#include "file-path.hh" #include "international.hh" #include "libc-extension.hh" #include "lily-guile.hh" +#include "main.hh" #include "misc.hh" -#include "warn.hh" +#include "program-option.hh" +#include "relocate.hh" +#include "string-convert.hh" #include "version.hh" -#include "dimensions.hh" -#include "main.hh" -#include "file-path.hh" +#include "warn.hh" + +/* Declaration of log function(s) */ +SCM ly_progress (SCM, SCM); + +LY_DEFINE (ly_start_environment, "ly:start-environment", + 0, 0, 0, (), + "Return the environment (a list of strings) that was in" + " effect at program start.") +{ + SCM l = SCM_EOL; + SCM *tail = &l; + + for (vsize i = 0; i < start_environment_global.size (); i++) + { + *tail = scm_cons (ly_string2scm (start_environment_global[i]), + SCM_EOL); + tail = SCM_CDRLOC (*tail); + } + + return l; +} LY_DEFINE (ly_find_file, "ly:find-file", - 1, 0, 0, (SCM name), - "Return the absolute file name of @var{name}, " - "or @code{#f} if not found.") + 1, 0, 0, (SCM name), + "Return the absolute file name of @var{name}," + " or @code{#f} if not found.") { - SCM_ASSERT_TYPE (scm_is_string (name), name, SCM_ARG1, __FUNCTION__, "string"); + LY_ASSERT_TYPE (scm_is_string, name, 1); string nm = ly_scm2string (name); string file_name = global_path.find (nm); if (file_name.empty ()) return SCM_BOOL_F; - return scm_makfrom0str (file_name.c_str ()); + return ly_string2scm (file_name); } /* @@ -43,136 +81,170 @@ LY_DEFINE (ly_find_file, "ly:find-file", buffering.) */ LY_DEFINE (ly_gulp_file, "ly:gulp-file", - 1, 1, 0, (SCM name, SCM size), - "Read the file @var{name}, and return its contents in a string. " - "The file is looked up using the search path. ") + 1, 1, 0, (SCM name, SCM size), + "Read @var{size} characters from the file @var{name}," + " and return its contents in a string." + " If @var{size} is undefined, the entire file is read." + " The file is looked up using the search path.") { - SCM_ASSERT_TYPE (scm_is_string (name), name, SCM_ARG1, __FUNCTION__, "string"); + LY_ASSERT_TYPE (scm_is_string, name, 1); int sz = INT_MAX; - if (size != SCM_UNDEFINED) + if (!SCM_UNBNDP (size)) { - SCM_ASSERT_TYPE (scm_is_number (size), size, SCM_ARG2, __FUNCTION__, "number"); + LY_ASSERT_TYPE (scm_is_number, size, 2); sz = scm_to_int (size); } - + string contents = gulp_file_to_string (ly_scm2string (name), true, sz); - return scm_from_locale_stringn (contents.c_str (), contents.length ()); + return scm_from_latin1_stringn (contents.c_str (), contents.length ()); } -LY_DEFINE (ly_error, "ly:error", - 1, 0, 1, (SCM str, SCM rest), - "Scheme callable function to issue the error @code{msg}. " - "The error is formatted with @code{format} and @code{rest}.") +LY_DEFINE (ly_dir_p, "ly:dir?", + 1, 0, 0, (SCM s), + "Is @var{s} a direction? Valid directions are @w{@code{-1}}," + " @code{0}, or@tie{}@code{1}, where @w{@code{-1}} represents" + " left or down, @code{1}@tie{}represents right or up, and @code{0}" + " represents a neutral direction.") { - SCM_ASSERT_TYPE (scm_is_string (str), str, SCM_ARG1, __FUNCTION__, "string"); - str = scm_simple_format (SCM_BOOL_F, str, rest); - error (ly_scm2string (str)); - return SCM_UNSPECIFIED; + if (scm_is_integer (s)) + { + int i = scm_to_int (s); + return (i >= -1 && i <= 1) ? SCM_BOOL_T : SCM_BOOL_F; + } + return SCM_BOOL_F; } -LY_DEFINE (ly_message, "ly:message", - 1, 0, 1, (SCM str, SCM rest), - "Scheme callable function to issue the message @code{msg}. " - "The message is formatted with @code{format} and @code{rest}.") +LY_DEFINE (ly_assoc_get, "ly:assoc-get", + 2, 2, 0, + (SCM key, SCM alist, SCM default_value, SCM strict_checking), + "Return value if @var{key} in @var{alist}, else @var{default-value}" + " (or @code{#f} if not specified). If @var{strict-checking} is set" + " to @code{#t} and @var{key} is not in @var{alist}, a programming_error" + " is output.") { - SCM_ASSERT_TYPE (scm_is_string (str), str, SCM_ARG1, __FUNCTION__, "string"); - str = scm_simple_format (SCM_BOOL_F, str, rest); - message (ly_scm2string (str)); - return SCM_UNSPECIFIED; -} + LY_ASSERT_TYPE (ly_cheap_is_list, alist, 2); -LY_DEFINE (ly_progress, "ly:progress", - 1, 0, 1, (SCM str, SCM rest), - "Scheme callable function to print progress @code{str}. " - "The message is formatted with @code{format} and @code{rest}.") -{ - SCM_ASSERT_TYPE (scm_is_string (str), str, SCM_ARG1, __FUNCTION__, "string"); - str = scm_simple_format (SCM_BOOL_F, str, rest); - progress_indication (ly_scm2string (str)); - return SCM_UNSPECIFIED; -} + SCM handle = scm_assoc (key, alist); + if (scm_is_pair (handle)) + return scm_cdr (handle); -LY_DEFINE (ly_programming_error, "ly:programming-error", - 1, 0, 1, (SCM str, SCM rest), - "Scheme callable function to issue the warning @code{msg}. " - "The message is formatted with @code{format} and @code{rest}.") -{ - SCM_ASSERT_TYPE (scm_is_string (str), str, SCM_ARG1, __FUNCTION__, "string"); - str = scm_simple_format (SCM_BOOL_F, str, rest); - programming_error (ly_scm2string (str)); - return SCM_UNSPECIFIED; + if (SCM_UNBNDP (default_value)) + default_value = SCM_BOOL_F; + + if (to_boolean (strict_checking)) + { + string key_string = ly_scm2string + (scm_object_to_string (key, SCM_UNDEFINED)); + string default_value_string = ly_scm2string + (scm_object_to_string (default_value, + SCM_UNDEFINED)); + programming_error ("Cannot find key `" + + key_string + + "' in alist, setting to `" + + default_value_string + "'."); + } + + return default_value; } -LY_DEFINE (ly_warning, "ly:warning", - 1, 0, 1, (SCM str, SCM rest), - "Scheme callable function to issue the warning @code{str}. " - "The message is formatted with @code{format} and @code{rest}.") +LY_DEFINE (ly_string_substitute, "ly:string-substitute", + 3, 0, 0, (SCM a, SCM b, SCM s), + "Replace string@tie{}@var{a} by string@tie{}@var{b} in" + " string@tie{}@var{s}.") { - SCM_ASSERT_TYPE (scm_is_string (str), str, SCM_ARG1, __FUNCTION__, "string"); - str = scm_simple_format (SCM_BOOL_F, str, rest); - warning (ly_scm2string (str)); - return SCM_UNSPECIFIED; + LY_ASSERT_TYPE (scm_is_string, s, 1); + LY_ASSERT_TYPE (scm_is_string, b, 2); + LY_ASSERT_TYPE (scm_is_string, s, 3); + + string ss = ly_scm2string (s); + replace_all (&ss, ly_scm2string (a), + ly_scm2string (b)); + + return ly_string2scm (ss); } -LY_DEFINE (ly_dir_p, "ly:dir?", - 1, 0, 0, (SCM s), - "type predicate. A direction is @code{-1}, @code{0} or " - "@code{1}, where @code{-1} represents " - "left or down and @code{1} represents right or up.") +bool +is_not_escape_character (Byte c) { - if (scm_is_number (s)) + switch (c) { - int i = scm_to_int (s); - return (i >= -1 && i <= 1) ? SCM_BOOL_T : SCM_BOOL_F; + case '-': + case '.': + case '/': + case '0'...'9': + case ':': + case 'A'...'Z': + case '_': + case 'a'...'z': + return true; } - return SCM_BOOL_F; + + return false; } -LY_DEFINE (ly_assoc_get, "ly:assoc-get", - 2, 1, 0, - (SCM key, SCM alist, SCM default_value), - "Return value if KEY in ALIST, else DEFAULT-VALUE " - "(or #f if not specified).") +LY_DEFINE (ly_string_percent_encode, "ly:string-percent-encode", + 1, 0, 0, (SCM str), + "Encode all characters in string @var{str} with hexadecimal" + " percent escape sequences, with the following exceptions:" + " characters @w{@code{-},} @code{.}, @code{/}, and @code{_}; and" + " characters in ranges @code{0-9}, @code{A-Z}, and @code{a-z}.") { - SCM handle = scm_assoc (key, alist); + LY_ASSERT_TYPE (scm_is_string, str, 1); - if (default_value == SCM_UNDEFINED) - default_value = SCM_BOOL_F; + string orig_str = ly_scm2string (str); + string new_str = ""; - if (scm_is_pair (handle)) - return scm_cdr (handle); - return default_value; + vsize i = 0; + vsize n = orig_str.size (); + + while (i < n) + { + Byte cur = orig_str[i]; + + if (is_not_escape_character (cur)) + new_str += cur; + else + { + new_str += '%'; + new_str += String_convert::bin2hex (cur); + } + + i++; + } + + return ly_string2scm (new_str); } -LY_DEFINE (ly_number2string, "ly:number->string", - 1, 0, 0, (SCM s), - "Convert @var{num} to a string without generating many decimals.") +LY_DEFINE (ly_number_2_string, "ly:number->string", + 1, 0, 0, (SCM s), + "Convert @var{s} to a string without generating many decimals.") { - SCM_ASSERT_TYPE (scm_is_number (s), s, SCM_ARG1, __FUNCTION__, "number"); + LY_ASSERT_TYPE (scm_is_number, s, 1); - char str[400]; // ugh. + char str[400]; // ugh. - if (scm_exact_p (s) == SCM_BOOL_F) + if (scm_is_false (scm_exact_p (s))) { Real r (scm_to_double (s)); - if (isinf (r) || isnan (r)) - { - programming_error (_ ("infinity or NaN encountered while converting Real number")); - programming_error (_ ("setting to zero")); + if (isinf (r) || isnan (r)) + { + programming_error ("infinity or NaN encountered while converting Real number, " + "setting to zero"); - r = 0.0; - } + r = 0.0; + } - snprintf (str, sizeof (str), "%08.4f", r); + snprintf (str, sizeof (str), "%.4f", r); } else snprintf (str, sizeof (str), "%d", int (scm_to_int (s))); - return scm_makfrom0str (str); + return scm_from_ascii_string (str); } LY_DEFINE (ly_version, "ly:version", 0, 0, 0, (), - "Return the current lilypond version as a list, e.g. @code{(1 3 127 uu1)}. ") + "Return the current lilypond version as a list, e.g.," + " @code{(1 3 127 uu1)}.") { char const *vs = "\'(" MAJOR_VERSION " " MINOR_VERSION " " PATCH_LEVEL " " MY_PATCH_LEVEL ")"; @@ -180,14 +252,14 @@ LY_DEFINE (ly_version, "ly:version", 0, 0, 0, (), } LY_DEFINE (ly_unit, "ly:unit", 0, 0, 0, (), - "Return the unit used for lengths as a string.") + "Return the unit used for lengths as a string.") { - return scm_makfrom0str (INTERNAL_UNIT); + return scm_from_ascii_string (INTERNAL_UNIT); } LY_DEFINE (ly_dimension_p, "ly:dimension?", 1, 0, 0, (SCM d), - "Return @var{d} is a number. Used to distinguish length " - "variables from normal numbers.") + "Return @var{d} as a number. Used to distinguish length" + " variables from normal numbers.") { return scm_number_p (d); } @@ -196,50 +268,55 @@ LY_DEFINE (ly_dimension_p, "ly:dimension?", 1, 0, 0, (SCM d), Debugging mem leaks: */ LY_DEFINE (ly_protects, "ly:protects", - 0, 0, 0, (), - "Return hash of protected objects.") + 0, 0, 0, (), + "Return hash of protected objects.") { + //scm_protects is available only in Guile versions before 2.1. +#if SCM_MAJOR_VERSION < 2 || SCM_MAJOR_VERSION == 2 && SCM_MINOR_VERSION < 1 return scm_protects; +#else + return programming_error ("ly:protects is not supported in Guile 2.1"); +#endif } LY_DEFINE (ly_gettext, "ly:gettext", - 1, 0, 0, (SCM string), - "Gettext wrapper.") + 1, 0, 0, (SCM original), + "A Scheme wrapper function for @code{gettext}.") { - SCM_ASSERT_TYPE (scm_is_string (string), string, SCM_ARG1, - __FUNCTION__, "string"); - return scm_makfrom0str (_ (scm_i_string_chars (string)).c_str ()); -} - -LY_DEFINE (ly_output_backend, "ly:output-backend", - 0, 0, 0, (), - "Return name of output backend.") -{ - return scm_makfrom0str (output_backend_global.c_str ()); + LY_ASSERT_TYPE (scm_is_string, original, 1); + return ly_string2scm (_ (ly_scm2string (original).c_str ())); } LY_DEFINE (ly_output_formats, "ly:output-formats", - 0, 0, 0, (), - "Formats passed to --format as a list of strings, " - "used for the output.") + 0, 0, 0, (), + "Formats passed to @option{--format} as a list of strings," + " used for the output.") { vector output_formats = string_split (output_format_global, ','); SCM lst = SCM_EOL; int output_formats_count = output_formats.size (); for (int i = 0; i < output_formats_count; i++) - lst = scm_cons (scm_makfrom0str (output_formats[i].c_str ()), lst); + lst = scm_cons (ly_string2scm (output_formats[i]), lst); return lst; } -LY_DEFINE (ly_wchar_to_utf_8, "ly:wide-char->utf-8", - 1, 0, 0, (SCM wc), - "Encode the Unicode codepoint @var{wc}, an integer, as UTF-8") +LY_DEFINE (ly_bigpdfs, "ly:bigpdfs", + 0, 0, 0, (), + "Return true if the command line includes the @option{--bigpdf} parameter." +) +{ + return bigpdfs ? SCM_BOOL_T : SCM_BOOL_F; +} + +LY_DEFINE (ly_wide_char_2_utf_8, "ly:wide-char->utf-8", + 1, 0, 0, (SCM wc), + "Encode the Unicode codepoint @var{wc}, an integer, as UTF-8.") { char buf[5]; - SCM_ASSERT_TYPE (scm_is_integer (wc), wc, SCM_ARG1, __FUNCTION__, "integer"); + LY_ASSERT_TYPE (scm_is_integer, wc, 1); unsigned wide_char = (unsigned) scm_to_int (wc); char *p = buf; @@ -265,77 +342,338 @@ LY_DEFINE (ly_wchar_to_utf_8, "ly:wide-char->utf-8", } *p = 0; - return scm_makfrom0str (buf); + return scm_from_utf8_string (buf); } LY_DEFINE (ly_effective_prefix, "ly:effective-prefix", - 0, 0, 0, (), - "Return effective prefix.") + 0, 0, 0, (), + "Return effective prefix.") { - return scm_makfrom0str (prefix_directory.c_str ()); + 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.") + 2, 2, 0, (SCM key, SCM achain, SCM default_value, SCM strict_checking), + "Return value for @var{key} from a list of alists @var{achain}." + " If no entry is found, return @var{default-value} or @code{#f} if" + " @var{default-value} is not specified. With @var{strict-checking}" + " set to @code{#t}, a programming_error is output in such cases.") { if (scm_is_pair (achain)) { SCM handle = scm_assoc (key, scm_car (achain)); if (scm_is_pair (handle)) - return scm_cdr (handle); + return scm_cdr (handle); else - return ly_chain_assoc_get (key, scm_cdr (achain), dfault); + return ly_chain_assoc_get (key, scm_cdr (achain), default_value); } - return dfault == SCM_UNDEFINED ? SCM_BOOL_F : dfault; + + if (to_boolean (strict_checking)) + { + string key_string = ly_scm2string + (scm_object_to_string (key, SCM_UNDEFINED)); + string default_value_string = ly_scm2string + (scm_object_to_string (default_value, + SCM_UNDEFINED)); + programming_error ("Cannot find key `" + + key_string + + "' in achain, setting to `" + + default_value_string + "'."); + } + + return SCM_UNBNDP (default_value) ? SCM_BOOL_F : default_value; } LY_DEFINE (ly_stderr_redirect, "ly:stderr-redirect", - 1, 1, 0, (SCM file_name, SCM mode), - "Redirect stderr to FILE-NAME, opened with MODE.") + 1, 1, 0, (SCM file_name, SCM mode), + "Redirect stderr to @var{file-name}, opened with @var{mode}.") { - SCM_ASSERT_TYPE (scm_is_string (file_name), file_name, SCM_ARG1, - __FUNCTION__, "file_name"); - char const *m = "w"; - if (mode != SCM_UNDEFINED && scm_string_p (mode)) - m = ly_scm2newstr (mode, 0); + LY_ASSERT_TYPE (scm_is_string, file_name, 1); + + string m = "w"; + string f = ly_scm2string (file_name); + FILE *stderrfile; + if (scm_is_string (mode)) + m = ly_scm2string (mode); /* dup2 and (fileno (current-error-port)) do not work with mingw'c gcc -mwindows. */ - freopen (ly_scm2newstr (file_name, 0), m, stderr); + fflush (stderr); + stderrfile = freopen (f.c_str (), m.c_str (), stderr); + if (!stderrfile) + error (_f ("failed redirecting stderr to `%s'", f.c_str ())); return SCM_UNSPECIFIED; } static SCM -accumulate_symbol (void *closure, SCM key, SCM val, SCM result) +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}") +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); + return scm_internal_hash_fold ((scm_t_hash_fold_fn) &accumulate_symbol, + NULL, SCM_EOL, tab); } -LY_DEFINE (ly_camel_case_to_lisp_identifier, "ly:camel-case->lisp-identifier", - 1, 0, 0, (SCM name_sym), - "Convert FooBar_Bla to foo-bar-bla style symbol.") +LY_DEFINE (ly_camel_case_2_lisp_identifier, "ly:camel-case->lisp-identifier", + 1, 0, 0, (SCM name_sym), + "Convert @code{FooBar_Bla} to @code{foo-bar-bla} style symbol.") { - SCM_ASSERT_TYPE(scm_is_symbol (name_sym), name_sym, - SCM_ARG1, __FUNCTION__, "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 @code{$VAR} and @code{$@{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, bool escape = false) +{ + if (scm_is_integer (arg) && scm_is_true (scm_exact_p (arg))) + 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)) + { + string s = ly_scm2string (arg); + if (escape) + { + // Escape backslashes and double quotes, wrap it in double quotes + replace_all (&s, "\\", "\\\\"); + replace_all (&s, "\"", "\\\""); + // don't replace percents, since the png backend uses %d as escape sequence + // replace_all (&s, "%", "\\%"); + replace_all (&s, "$", "\\$"); + s = "\"" + s + "\""; + } + return s; + } + else if (scm_is_symbol (arg)) + return (ly_symbol2string (arg)); + else + { + ly_progress (scm_from_ascii_string ("\nUnsupported SCM value for format: ~a"), + scm_list_1 (arg)); + } + + return ""; +} + +LY_DEFINE (ly_format, "ly:format", + 1, 0, 1, (SCM str, SCM rest), + "LilyPond specific format, supporting @code{~a} and @code{~[0-9]f}." + " Basic support for @code{~s} is also provided.") +{ + LY_ASSERT_TYPE (scm_is_string, str, 1); + + string format = ly_scm2string (str); + vector results; + + vsize i = 0; + while (i < format.size ()) + { + vsize tilde = format.find ('~', i); + + results.push_back (format.substr (i, (tilde - i))); + + if (tilde == NPOS) + break; + + tilde++; + + char spec = format.at (tilde++); + if (spec == '~') + results.push_back ("~"); + else + { + if (!scm_is_pair (rest)) + { + programming_error (string (__FUNCTION__) + + ": not enough arguments for format."); + return ly_string2scm (""); + } + + SCM arg = scm_car (rest); + rest = scm_cdr (rest); + + int precision = 8; + + if (spec == '$') + precision = 2; + else if (isdigit (spec)) + { + precision = spec - '0'; + spec = format.at (tilde++); + } + + if (spec == 'a' || spec == 'A' || spec == 'f' || spec == '$') + results.push_back (format_single_argument (arg, precision)); + else if (spec == 's' || spec == 'S') + results.push_back (format_single_argument (arg, precision, true)); + else if (spec == 'l') + { + SCM s = arg; + for (; scm_is_pair (s); s = scm_cdr (s)) + { + results.push_back (format_single_argument (scm_car (s), precision)); + if (!scm_is_null (scm_cdr (s))) + results.push_back (" "); + } + + if (!scm_is_null (s)) + results.push_back (format_single_argument (s, precision)); + + } + } + + i = tilde; + } + + if (scm_is_pair (rest)) + programming_error (string (__FUNCTION__) + + ": too many arguments"); + + vsize len = 0; + for (vsize i = 0; i < results.size (); i++) + len += results[i].size (); + + char *result = (char *) scm_malloc (len + 1); + char *ptr = result; + for (vsize i = 0; i < results.size (); i++) + { + // strcpy and strncpy cannot be used here + // because std::string may contain '\0' in its contents. + results[i].copy (ptr, results[i].size ()); + ptr += results[i].size (); + } + *ptr = '\0'; + + return scm_take_locale_stringn (result, len); +} + +int +ly_run_command (char *argv[], char **standard_output, char **standard_error) +{ + GError *error = 0; + int exit_status = 0; + int flags = G_SPAWN_SEARCH_PATH; + if (!standard_output) + flags |= G_SPAWN_STDOUT_TO_DEV_NULL; + if (!standard_error) + flags |= G_SPAWN_STDERR_TO_DEV_NULL; + if (!g_spawn_sync (0, argv, 0, GSpawnFlags (flags), + 0, 0, + standard_output, standard_error, + &exit_status, &error)) + { + warning (_f ("g_spawn_sync failed (%d): %s: %s", + exit_status, argv[0], error->message)); + g_error_free (error); + if (!exit_status) + exit_status = -1; + } + + return exit_status; +} + +static char * +ly_scm2utf8 (SCM str) +{ + char *p = ly_scm2str0 (str); + char *g = g_locale_to_utf8 (p, -1, 0, 0, 0); + free (p); + return g; +} + +LY_DEFINE (ly_spawn, "ly:spawn", + 1, 0, 1, (SCM command, SCM rest), + "Simple interface to g_spawn_sync" + " @var{str}." + " The error is formatted with @code{format} and @var{rest}.") + +{ + LY_ASSERT_TYPE (scm_is_string, command, 1); + + int argc = scm_is_pair (rest) ? scm_ilength (rest) : 0; + char **argv = new char*[argc + 2]; + + int n = 0; + argv[n++] = ly_scm2utf8 (command); + for (SCM s = rest; scm_is_pair (s); s = scm_cdr (s)) + argv[n++] = ly_scm2utf8 (scm_car (s)); + argv[n] = 0; + + char *standard_output = 0; + char *standard_error = 0; + // Always get the pointer to the stdout/stderr messages + int exit_status = ly_run_command (argv, &standard_output, &standard_error); + + if (standard_output && standard_error) + { + // Print out stdout and stderr only in debug mode + debug_output (string ("\n") + standard_output + standard_error, true); + } + + g_free (standard_error); + g_free (standard_output); + + for (int i = 0; i < n; i++) + free (argv[i]); + delete[] argv; + + return scm_from_int (exit_status); +}