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Flag: Use designated initializers

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This commit is contained in:
Eelco Dolstra 2020-05-04 22:40:19 +02:00
parent e9f10beed1
commit a721a0b114
22 changed files with 406 additions and 362 deletions
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44
src/libutil/args.cc
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@ -3,16 +3,14 @@
namespace nix {
Args::FlagMaker Args::mkFlag()
{
return FlagMaker(*this);
}
Args::FlagMaker::~FlagMaker()
void Args::addFlag(Flag && flag_)
{
auto flag = std::make_shared<Flag>(std::move(flag_));
if (flag->handler.arity != ArityAny)
assert(flag->handler.arity == flag->labels.size());
assert(flag->longName != "");
args.longFlags[flag->longName] = flag;
if (flag->shortName) args.shortFlags[flag->shortName] = flag;
longFlags[flag->longName] = flag;
if (flag->shortName) shortFlags[flag->shortName] = flag;
}
void Args::parseCmdline(const Strings & _cmdline)
@ -101,15 +99,14 @@ bool Args::processFlag(Strings::iterator & pos, Strings::iterator end)
auto process = [&](const std::string & name, const Flag & flag) -> bool {
++pos;
std::vector<std::string> args;
for (size_t n = 0 ; n < flag.arity; ++n) {
for (size_t n = 0 ; n < flag.handler.arity; ++n) {
if (pos == end) {
if (flag.arity == ArityAny) break;
throw UsageError(format("flag '%1%' requires %2% argument(s)")
% name % flag.arity);
if (flag.handler.arity == ArityAny) break;
throw UsageError("flag '%s' requires %d argument(s)", name, flag.handler.arity);
}
args.push_back(*pos++);
}
flag.handler(std::move(args));
flag.handler.fun(std::move(args));
return true;
};
@ -157,17 +154,18 @@ bool Args::processArgs(const Strings & args, bool finish)
return res;
}
Args::FlagMaker & Args::FlagMaker::mkHashTypeFlag(HashType * ht)
Args::Flag Args::Flag::mkHashTypeFlag(std::string && longName, HashType * ht)
{
arity(1);
label("type");
description("hash algorithm ('md5', 'sha1', 'sha256', or 'sha512')");
handler([ht](std::string s) {
*ht = parseHashType(s);
if (*ht == htUnknown)
throw UsageError("unknown hash type '%1%'", s);
});
return *this;
return Flag {
.longName = std::move(longName),
.description = "hash algorithm ('md5', 'sha1', 'sha256', or 'sha512')",
.labels = {"hash-algo"},
.handler = {[ht](std::string s) {
*ht = parseHashType(s);
if (*ht == htUnknown)
throw UsageError("unknown hash type '%1%'", s);
}}
};
}
Strings argvToStrings(int argc, char * * argv)