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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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139
src/libutil/args.hh
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@ -32,13 +32,59 @@ protected:
struct Flag
{
typedef std::shared_ptr<Flag> ptr;
struct Handler
{
std::function<void(std::vector<std::string>)> fun;
size_t arity;
Handler() {}
Handler(std::function<void(std::vector<std::string>)> && fun)
: fun(std::move(fun))
, arity(ArityAny)
{ }
Handler(std::function<void()> && handler)
: fun([handler{std::move(handler)}](std::vector<std::string>) { handler(); })
, arity(0)
{ }
Handler(std::function<void(std::string)> && handler)
: fun([handler{std::move(handler)}](std::vector<std::string> ss) {
handler(std::move(ss[0]));
})
, arity(1)
{ }
Handler(std::function<void(std::string, std::string)> && handler)
: fun([handler{std::move(handler)}](std::vector<std::string> ss) {
handler(std::move(ss[0]), std::move(ss[1]));
})
, arity(2)
{ }
template<class T>
Handler(T * dest)
: fun([=](std::vector<std::string> ss) { *dest = ss[0]; })
, arity(1)
{ }
template<class T>
Handler(T * dest, const T & val)
: fun([=](std::vector<std::string> ss) { *dest = val; })
, arity(0)
{ }
};
std::string longName;
char shortName = 0;
std::string description;
Strings labels;
size_t arity = 0;
std::function<void(std::vector<std::string>)> handler;
std::string category;
Strings labels;
Handler handler;
static Flag mkHashTypeFlag(std::string && longName, HashType * ht);
};
std::map<std::string, Flag::ptr> longFlags;
@ -65,49 +111,7 @@ protected:
public:
class FlagMaker
{
Args & args;
Flag::ptr flag;
friend class Args;
FlagMaker(Args & args) : args(args), flag(std::make_shared<Flag>()) { }
public:
~FlagMaker();
FlagMaker & longName(const std::string & s) { flag->longName = s; return *this; }
FlagMaker & shortName(char s) { flag->shortName = s; return *this; }
FlagMaker & description(const std::string & s) { flag->description = s; return *this; }
FlagMaker & label(const std::string & l) { flag->arity = 1; flag->labels = {l}; return *this; }
FlagMaker & labels(const Strings & ls) { flag->arity = ls.size(); flag->labels = ls; return *this; }
FlagMaker & arity(size_t arity) { flag->arity = arity; return *this; }
FlagMaker & handler(std::function<void(std::vector<std::string>)> handler) { flag->handler = handler; return *this; }
FlagMaker & handler(std::function<void()> handler) { flag->handler = [handler](std::vector<std::string>) { handler(); }; return *this; }
FlagMaker & handler(std::function<void(std::string)> handler) {
flag->arity = 1;
flag->handler = [handler](std::vector<std::string> ss) { handler(std::move(ss[0])); };
return *this;
}
FlagMaker & category(const std::string & s) { flag->category = s; return *this; }
template<class T>
FlagMaker & dest(T * dest)
{
flag->arity = 1;
flag->handler = [=](std::vector<std::string> ss) { *dest = ss[0]; };
return *this;
}
template<class T>
FlagMaker & set(T * dest, const T & val)
{
flag->arity = 0;
flag->handler = [=](std::vector<std::string> ss) { *dest = val; };
return *this;
}
FlagMaker & mkHashTypeFlag(HashType * ht);
};
FlagMaker mkFlag();
void addFlag(Flag && flag);
/* Helper functions for constructing flags / positional
arguments. */
@ -116,13 +120,13 @@ public:
const std::string & label, const std::string & description,
std::function<void(std::string)> fun)
{
mkFlag()
.shortName(shortName)
.longName(longName)
.labels({label})
.description(description)
.arity(1)
.handler([=](std::vector<std::string> ss) { fun(ss[0]); });
addFlag({
.longName = longName,
.shortName = shortName,
.description = description,
.labels = {label},
.handler = {[=](std::string s) { fun(s); }}
});
}
void mkFlag(char shortName, const std::string & name,
@ -135,11 +139,12 @@ public:
void mkFlag(char shortName, const std::string & longName, const std::string & description,
T * dest, const T & value)
{
mkFlag()
.shortName(shortName)
.longName(longName)
.description(description)
.handler([=](std::vector<std::string> ss) { *dest = value; });
addFlag({
.longName = longName,
.shortName = shortName,
.description = description,
.handler = {[=]() { *dest = value; }}
});
}
template<class I>
@ -155,18 +160,18 @@ public:
void mkFlag(char shortName, const std::string & longName,
const std::string & description, std::function<void(I)> fun)
{
mkFlag()
.shortName(shortName)
.longName(longName)
.labels({"N"})
.description(description)
.arity(1)
.handler([=](std::vector<std::string> ss) {
addFlag({
.longName = longName,
.shortName = shortName,
.description = description,
.labels = {"N"},
.handler = {[=](std::string s) {
I n;
if (!string2Int(ss[0], n))
if (!string2Int(s, n))
throw UsageError("flag '--%s' requires a integer argument", longName);
fun(n);
});
}}
});
}
/* Expect a string argument. */