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Don't show flags from config settings in "nix --help"

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This commit is contained in:
Eelco Dolstra 2017-06-07 18:41:20 +02:00
parent aa952d5f0b
commit 186571965d
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GPG key ID: 8170B4726D7198DE
9 changed files with 140 additions and 54 deletions
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83
src/libutil/args.hh
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@ -29,15 +29,18 @@ protected:
/* Flags. */
struct Flag
{
char shortName;
typedef std::shared_ptr<Flag> ptr;
std::string longName;
char shortName = 0;
std::string description;
Strings labels;
size_t arity;
size_t arity = 0;
std::function<void(Strings)> handler;
std::string category;
};
std::map<std::string, Flag> longFlags;
std::map<char, Flag> shortFlags;
std::map<std::string, Flag::ptr> longFlags;
std::map<char, Flag::ptr> shortFlags;
virtual bool processFlag(Strings::iterator & pos, Strings::iterator end);
@ -55,33 +58,53 @@ protected:
virtual bool processArgs(const Strings & args, bool finish);
std::set<std::string> hiddenCategories;
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 & labels(const Strings & ls) { flag->labels = ls; return *this; };
FlagMaker & arity(size_t arity) { flag->arity = arity; return *this; };
FlagMaker & handler(std::function<void(Strings)> handler) { flag->handler = handler; return *this; };
FlagMaker & category(const std::string & s) { flag->category = s; return *this; };
};
FlagMaker mkFlag();
/* Helper functions for constructing flags / positional
arguments. */
void mkFlag(char shortName, const std::string & longName,
const Strings & labels, const std::string & description,
size_t arity, std::function<void(Strings)> handler)
{
auto flag = Flag{shortName, description, labels, arity, handler};
if (shortName) shortFlags[shortName] = flag;
longFlags[longName] = flag;
}
void mkFlag(char shortName, const std::string & longName,
const std::string & description, std::function<void()> fun)
{
mkFlag(shortName, longName, {}, description, 0, std::bind(fun));
mkFlag()
.shortName(shortName)
.longName(longName)
.description(description)
.handler(std::bind(fun));
}
void mkFlag1(char shortName, const std::string & longName,
const std::string & label, const std::string & description,
std::function<void(std::string)> fun)
{
mkFlag(shortName, longName, {label}, description, 1, [=](Strings ss) {
fun(ss.front());
});
mkFlag()
.shortName(shortName)
.longName(longName)
.labels({label})
.description(description)
.arity(1)
.handler([=](Strings ss) { fun(ss.front()); });
}
void mkFlag(char shortName, const std::string & name,
@ -105,9 +128,11 @@ public:
void mkFlag(char shortName, const std::string & longName, const std::string & description,
T * dest, const T & value)
{
mkFlag(shortName, longName, {}, description, 0, [=](Strings ss) {
*dest = value;
});
mkFlag()
.shortName(shortName)
.longName(longName)
.description(description)
.handler([=](Strings ss) { *dest = value; });
}
template<class I>
@ -123,12 +148,18 @@ public:
void mkFlag(char shortName, const std::string & longName,
const std::string & description, std::function<void(I)> fun)
{
mkFlag(shortName, longName, {"N"}, description, 1, [=](Strings ss) {
I n;
if (!string2Int(ss.front(), n))
throw UsageError(format("flag ‘--%1%’ requires a integer argument") % longName);
fun(n);
});
mkFlag()
.shortName(shortName)
.longName(longName)
.labels({"N"})
.description(description)
.arity(1)
.handler([=](Strings ss) {
I n;
if (!string2Int(ss.front(), n))
throw UsageError(format("flag ‘--%1%’ requires a integer argument") % longName);
fun(n);
});
}
/* Expect a string argument. */