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Allow support for command lines with non-argument filenames.

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This commit is contained in:
David Given
2019-08-31 01:40:44 +02:00
parent 4304d1eede
commit 5a2b2bc07a
2 changed files with 56 additions and 33 deletions
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88
lib/flags.cc
View File

@@ -29,7 +29,7 @@ void FlagGroup::addFlag(Flag* flag)
_flags.push_back(flag);
}
void FlagGroup::parseFlags(int argc, const char* argv[])
std::vector<std::string> FlagGroup::parseFlagsWithFilenames(int argc, const char* argv[])
{
if (_initialised)
throw std::runtime_error("called parseFlags() twice");
@@ -66,6 +66,7 @@ void FlagGroup::parseFlags(int argc, const char* argv[])
/* Now actually parse them. */
std::vector<std::string> filenames;
int index = 1;
while (index < argc)
{
@@ -76,52 +77,73 @@ void FlagGroup::parseFlags(int argc, const char* argv[])
std::string value;
bool usesthat = false;
if ((thisarg.size() == 0) || (thisarg[0] != '-'))
Error() << "non-option parameter " << thisarg << " seen (try --help)";
if ((thisarg.size() > 1) && (thisarg[1] == '-'))
if (thisarg.size() == 0)
{
/* Long option. */
auto equals = thisarg.rfind('=');
if (equals != std::string::npos)
{
key = thisarg.substr(0, equals);
value = thisarg.substr(equals+1);
}
else
{
key = thisarg;
value = thatarg;
usesthat = true;
}
/* Ignore this argument. */
}
else if (thisarg[0] != '-')
{
/* This is a filename. */
filenames.push_back(thisarg);
}
else
{
/* Short option. */
/* This is a flag. */
if (thisarg.size() > 2)
if ((thisarg.size() > 1) && (thisarg[1] == '-'))
{
key = thisarg.substr(0, 2);
value = thisarg.substr(2);
/* Long option. */
auto equals = thisarg.rfind('=');
if (equals != std::string::npos)
{
key = thisarg.substr(0, equals);
value = thisarg.substr(equals+1);
}
else
{
key = thisarg;
value = thatarg;
usesthat = true;
}
}
else
{
key = thisarg;
value = thatarg;
usesthat = true;
/* Short option. */
if (thisarg.size() > 2)
{
key = thisarg.substr(0, 2);
value = thisarg.substr(2);
}
else
{
key = thisarg;
value = thatarg;
usesthat = true;
}
}
auto flag = flags_by_name.find(key);
if (flag == flags_by_name.end())
Error() << "unknown flag '" << key << "'; try --help";
flag->second->set(value);
if (usesthat && flag->second->hasArgument())
index++;
}
auto flag = flags_by_name.find(key);
if (flag == flags_by_name.end())
Error() << "unknown flag '" << key << "'; try --help";
flag->second->set(value);
index++;
if (usesthat && flag->second->hasArgument())
index++;
}
return filenames;
}
void FlagGroup::parseFlags(int argc, const char* argv[])
{
auto filenames = parseFlagsWithFilenames(argc, argv);
if (!filenames.empty())
Error() << "non-option parameter " << *filenames.begin() << " seen (try --help)";
}
void FlagGroup::checkInitialised() const

1
lib/flags.h
View File

@@ -14,6 +14,7 @@ public:
public:
void parseFlags(int argc, const char* argv[]);
std::vector<std::string> parseFlagsWithFilenames(int argc, const char* argv[]);
void addFlag(Flag* flag);
void checkInitialised() const;