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Make the top-level functions deal with exceptions

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This commit is contained in:
Frédéric Mangano 2021-01-17 12:32:38 +01:00
parent ea00b8fd80
commit 51c7f29c1a
4 changed files with 56 additions and 45 deletions
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69
src/cli.cc
View File

@ -58,8 +58,9 @@ static struct option getopt_options[] = {
{NULL, 0, 0, 0}
};
ot::status ot::parse_options(int argc, char** argv, ot::options& opt, FILE* comments_input)
ot::options ot::parse_options(int argc, char** argv, FILE* comments_input)
{
options opt;
static ot::encoding_converter to_utf8("", "UTF-8");
std::string utf8;
const char* equal;
@ -67,7 +68,7 @@ ot::status ot::parse_options(int argc, char** argv, ot::options& opt, FILE* comm
bool set_all = false;
opt = {};
if (argc == 1)
return {st::bad_arguments, "No arguments specified. Use -h for help."};
throw status {st::bad_arguments, "No arguments specified. Use -h for help."};
int c;
optind = 0;
while ((c = getopt_long(argc, argv, ":ho:iyd:a:s:DSe", getopt_options, NULL)) != -1) {
@ -77,7 +78,7 @@ ot::status ot::parse_options(int argc, char** argv, ot::options& opt, FILE* comm
break;
case 'o':
if (opt.path_out)
return {st::bad_arguments, "Cannot specify --output more than once."};
throw status {st::bad_arguments, "Cannot specify --output more than once."};
opt.path_out = optarg;
break;
case 'i':
@ -94,7 +95,7 @@ ot::status ot::parse_options(int argc, char** argv, ot::options& opt, FILE* comm
case 's':
equal = strchr(optarg, '=');
if (equal == nullptr)
return {st::bad_arguments, "Comment does not contain an equal sign: "s + optarg + "."};
throw status {st::bad_arguments, "Comment does not contain an equal sign: "s + optarg + "."};
if (c == 's')
opt.to_delete.emplace_back(optarg, equal - optarg);
opt.to_add.emplace_back(optarg);
@ -113,15 +114,14 @@ ot::status ot::parse_options(int argc, char** argv, ot::options& opt, FILE* comm
opt.raw = true;
break;
case ':':
return {st::bad_arguments,
"Missing value for option '"s + argv[optind - 1] + "'."};
throw status {st::bad_arguments, "Missing value for option '"s + argv[optind - 1] + "'."};
default:
return {st::bad_arguments, "Unrecognized option '" +
(optopt ? "-"s + static_cast<char>(optopt) : argv[optind - 1]) + "'."};
throw status {st::bad_arguments, "Unrecognized option '" +
(optopt ? "-"s + static_cast<char>(optopt) : argv[optind - 1]) + "'."};
}
}
if (opt.print_help)
return st::ok;
return opt;
// All non-option arguments are input files.
bool stdin_as_input = false;
@ -136,42 +136,42 @@ ot::status ot::parse_options(int argc, char** argv, ot::options& opt, FILE* comm
for (std::string& arg : *args) {
rc = to_utf8(arg, utf8);
if (rc != ot::st::ok)
return {st::bad_arguments, "Could not encode argument into UTF-8: " + rc.message};
throw status {st::bad_arguments, "Could not encode argument into UTF-8: " + rc.message};
arg = std::move(utf8);
}
}
}
if (opt.in_place && opt.path_out)
return {st::bad_arguments, "Cannot combine --in-place and --output."};
throw status {st::bad_arguments, "Cannot combine --in-place and --output."};
if (opt.in_place && stdin_as_input)
return {st::bad_arguments, "Cannot modify standard input in place."};
throw status {st::bad_arguments, "Cannot modify standard input in place."};
if ((!opt.in_place || opt.edit_interactively) && opt.paths_in.size() != 1)
return {st::bad_arguments, "Exactly one input file must be specified."};
throw status {st::bad_arguments, "Exactly one input file must be specified."};
if (set_all && stdin_as_input)
return {st::bad_arguments, "Cannot use standard input as input file when --set-all is specified."};
throw status {st::bad_arguments, "Cannot use standard input as input file when --set-all is specified."};
if (opt.edit_interactively && (stdin_as_input || opt.path_out == "-"))
return {st::bad_arguments, "Cannot edit interactively when standard input or standard output are already used."};
throw status {st::bad_arguments, "Cannot edit interactively when standard input or standard output are already used."};
if (opt.edit_interactively && !opt.path_out.has_value() && !opt.in_place)
return {st::bad_arguments, "Cannot edit interactively when no output is specified."};
throw status {st::bad_arguments, "Cannot edit interactively when no output is specified."};
if (opt.edit_interactively && (opt.delete_all || !opt.to_add.empty() || !opt.to_delete.empty()))
return {st::bad_arguments, "Cannot mix --edit with -adDsS."};
throw status {st::bad_arguments, "Cannot mix --edit with -adDsS."};
if (set_all) {
// Read comments from stdin and prepend them to opt.to_add.
std::list<std::string> comments;
auto rc = read_comments(comments_input, comments, opt.raw);
if (rc != st::ok)
return rc;
throw rc;
opt.to_add.splice(opt.to_add.begin(), std::move(comments));
}
return st::ok;
return opt;
}
/**
@ -423,19 +423,23 @@ static ot::status process(ot::ogg_reader& reader, ot::ogg_writer* writer, const
return ot::st::ok;
}
static ot::status run_single(const ot::options& opt, const std::string& path_in, const std::optional<std::string>& path_out)
static void run_single(const ot::options& opt, const std::string& path_in, const std::optional<std::string>& path_out)
{
ot::file input;
if (path_in == "-")
input = stdin;
else if ((input = fopen(path_in.c_str(), "re")) == nullptr)
return {ot::st::standard_error,
"Could not open '" + path_in + "' for reading: " + strerror(errno)};
throw ot::status {ot::st::standard_error,
"Could not open '" + path_in + "' for reading: " + strerror(errno)};
ot::ogg_reader reader(input.get());
/* Read-only mode. */
if (!path_out)
return process(reader, nullptr, opt);
if (!path_out) {
ot::status rc = process(reader, nullptr, opt);
if (rc != ot::st::ok)
throw rc;
return;
}
/* Read-write mode.
*
@ -488,7 +492,7 @@ static ot::status run_single(const ot::options& opt, const std::string& path_in,
"Could not identify '" + path_in + "': " + strerror(errno)};
}
if (rc != ot::st::ok)
return rc;
throw rc;
ot::ogg_writer writer(output);
writer.path = path_out;
@ -496,24 +500,27 @@ static ot::status run_single(const ot::options& opt, const std::string& path_in,
if (rc == ot::st::ok)
rc = temporary_output.commit();
return rc;
if (rc != ot::st::ok)
throw rc;
}
ot::status ot::run(const ot::options& opt)
void ot::run(const ot::options& opt)
{
if (opt.print_help) {
fputs(help_message, stdout);
return st::ok;
return;
}
ot::status global_rc = st::ok;
for (const auto& path_in : opt.paths_in) {
ot::status rc = run_single(opt, path_in, opt.in_place ? path_in : opt.path_out);
if (rc != st::ok) {
try {
run_single(opt, path_in, opt.in_place ? path_in : opt.path_out);
} catch (const ot::status& rc) {
global_rc = st::error;
if (!rc.message.empty())
fprintf(stderr, "%s: error: %s\n", path_in.c_str(), rc.message.c_str());
}
}
return global_rc;
if (global_rc != st::ok)
throw global_rc;
}

19
src/opustags.cc
View File

@ -15,13 +15,14 @@
* Does practically nothing but call the cli module.
*/
int main(int argc, char** argv) {
setlocale(LC_ALL, "");
ot::options opt;
ot::status rc = ot::parse_options(argc, argv, opt, stdin);
if (rc == ot::st::ok)
rc = ot::run(opt);
else if (!rc.message.empty())
fprintf(stderr, "error: %s\n", rc.message.c_str());
return rc == ot::st::ok ? EXIT_SUCCESS : EXIT_FAILURE;
try {
setlocale(LC_ALL, "");
ot::options opt = ot::parse_options(argc, argv, stdin);
ot::run(opt);
return EXIT_SUCCESS;
} catch (const ot::status& rc) {
if (!rc.message.empty())
fprintf(stderr, "error: %s\n", rc.message.c_str());
return EXIT_FAILURE;
}
}

6
src/opustags.h
View File

@ -475,10 +475,8 @@ struct options {
/**
* Parse the command-line arguments. Does not perform I/O related validations, but checks the
* consistency of its arguments. Comments are read if necessary from the given stream.
*
* On error, the state of the options structure is unspecified.
*/
status parse_options(int argc, char** argv, options& opt, FILE* comments);
options parse_options(int argc, char** argv, FILE* comments);
/**
* Print all the comments, separated by line breaks. Since a comment may contain line breaks, this
@ -509,7 +507,7 @@ void delete_comments(std::list<std::string>& comments, const std::string& select
* Main entry point to the opustags program, and pretty much the same as calling opustags from the
* command-line.
*/
status run(const options& opt);
void run(const options& opt);
/** \} */

7
t/cli.cc
View File

@ -54,7 +54,12 @@ static ot::status parse_options(const std::vector<const char*>& args, ot::option
char* argv[argc];
for (int i = 0; i < argc; ++i)
argv[i] = strdup(args[i]);
ot::status rc = ot::parse_options(argc, argv, opt, comments);
ot::status rc = ot::st::ok;
try {
opt = ot::parse_options(argc, argv, comments);
} catch (const ot::status& e) {
rc = e;
}
for (int i = 0; i < argc; ++i)
free(argv[i]);
return rc;