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Cleanup

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This commit is contained in:
Eelco Dolstra 2020-05-11 15:46:18 +02:00
parent 0884f180f5
commit 4c3c638a05
9 changed files with 145 additions and 123 deletions
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90
src/libutil/args.cc
View file

@ -86,7 +86,7 @@ void Args::printHelp(const string & programName, std::ostream & out)
for (auto & exp : expectedArgs) {
std::cout << renderLabels({exp.label});
// FIXME: handle arity > 1
if (exp.arity == 0) std::cout << "...";
if (exp.handler.arity == ArityAny) std::cout << "...";
if (exp.optional) std::cout << "?";
}
std::cout << "\n";
@ -127,8 +127,8 @@ bool Args::processFlag(Strings::iterator & pos, Strings::iterator end)
if (flag.handler.arity == ArityAny) break;
throw UsageError("flag '%s' requires %d argument(s)", name, flag.handler.arity);
}
if (auto prefix = needsCompletion(*pos))
if (flag.completer)
if (flag.completer)
if (auto prefix = needsCompletion(*pos))
flag.completer(n, *prefix);
args.push_back(*pos++);
}
@ -179,12 +179,17 @@ bool Args::processArgs(const Strings & args, bool finish)
bool res = false;
if ((exp.arity == 0 && finish) ||
(exp.arity > 0 && args.size() == exp.arity))
if ((exp.handler.arity == ArityAny && finish) ||
(exp.handler.arity != ArityAny && args.size() == exp.handler.arity))
{
std::vector<std::string> ss;
for (auto & s : args) ss.push_back(s);
exp.handler(std::move(ss));
for (const auto &[n, s] : enumerate(args)) {
ss.push_back(s);
if (exp.completer)
if (auto prefix = needsCompletion(s))
exp.completer(n, *prefix);
}
exp.handler.fun(ss);
expectedArgs.pop_front();
res = true;
}
@ -214,46 +219,17 @@ Args::Flag Args::Flag::mkHashTypeFlag(std::string && longName, HashType * ht)
};
}
void completePath(size_t, std::string_view s)
void completePath(size_t, std::string_view prefix)
{
if (auto prefix = needsCompletion(s)) {
pathCompletions = true;
glob_t globbuf;
if (glob((*prefix + "*").c_str(), GLOB_NOESCAPE | GLOB_TILDE, nullptr, &globbuf) == 0) {
for (size_t i = 0; i < globbuf.gl_pathc; ++i)
completions->insert(globbuf.gl_pathv[i]);
globfree(&globbuf);
}
pathCompletions = true;
glob_t globbuf;
if (glob((std::string(prefix) + "*").c_str(), GLOB_NOESCAPE | GLOB_TILDE, nullptr, &globbuf) == 0) {
for (size_t i = 0; i < globbuf.gl_pathc; ++i)
completions->insert(globbuf.gl_pathv[i]);
globfree(&globbuf);
}
}
void Args::expectPathArg(const std::string & label, string * dest, bool optional)
{
expectedArgs.push_back({
.label = label,
.arity = 1,
.optional = optional,
.handler = {[=](std::vector<std::string> ss) {
completePath(0, ss[0]);
*dest = ss[0];
}}
});
}
void Args::expectPathArgs(const std::string & label, std::vector<std::string> * dest)
{
expectedArgs.push_back({
.label = label,
.arity = 0,
.optional = false,
.handler = {[=](std::vector<std::string> ss) {
for (auto & s : ss)
completePath(0, s);
*dest = std::move(ss);
}}
});
}
Strings argvToStrings(int argc, char * * argv)
{
Strings args;
@ -301,18 +277,22 @@ void Command::printHelp(const string & programName, std::ostream & out)
MultiCommand::MultiCommand(const Commands & commands)
: commands(commands)
{
expectedArgs.push_back(ExpectedArg{"command", 1, true, [=](std::vector<std::string> ss) {
assert(!command);
if (auto prefix = needsCompletion(ss[0])) {
for (auto & [name, command] : commands)
if (hasPrefix(name, *prefix))
completions->insert(name);
}
auto i = commands.find(ss[0]);
if (i == commands.end())
throw UsageError("'%s' is not a recognised command", ss[0]);
command = {ss[0], i->second()};
}});
expectArgs({
.label = "command",
.optional = true,
.handler = {[=](std::string s) {
assert(!command);
if (auto prefix = needsCompletion(s)) {
for (auto & [name, command] : commands)
if (hasPrefix(name, *prefix))
completions->insert(name);
}
auto i = commands.find(s);
if (i == commands.end())
throw UsageError("'%s' is not a recognised command", s);
command = {s, i->second()};
}}
});
categories[Command::catDefault] = "Available commands";
}

123
src/libutil/args.hh
View file

@ -28,55 +28,60 @@ protected:
static const size_t ArityAny = std::numeric_limits<size_t>::max();
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)
{ }
Handler(std::vector<std::string> * dest)
: fun([=](std::vector<std::string> ss) { *dest = ss; })
, arity(ArityAny)
{ }
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)
{ }
};
/* Flags. */
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;
@ -99,9 +104,9 @@ protected:
struct ExpectedArg
{
std::string label;
size_t arity = 0; // 0 = any
bool optional = false;
std::function<void(std::vector<std::string>)> handler;
Handler handler;
std::function<void(size_t, std::string_view)> completer;
};
std::list<ExpectedArg> expectedArgs;
@ -175,26 +180,30 @@ public:
});
}
void expectArgs(ExpectedArg && arg)
{
expectedArgs.emplace_back(std::move(arg));
}
/* Expect a string argument. */
void expectArg(const std::string & label, string * dest, bool optional = false)
{
expectedArgs.push_back(ExpectedArg{label, 1, optional, [=](std::vector<std::string> ss) {
*dest = ss[0];
}});
expectArgs({
.label = label,
.optional = true,
.handler = {dest}
});
}
void expectPathArg(const std::string & label, string * dest, bool optional = false);
/* Expect 0 or more arguments. */
void expectArgs(const std::string & label, std::vector<std::string> * dest)
{
expectedArgs.push_back(ExpectedArg{label, 0, false, [=](std::vector<std::string> ss) {
*dest = std::move(ss);
}});
expectArgs({
.label = label,
.handler = {dest}
});
}
void expectPathArgs(const std::string & label, std::vector<std::string> * dest);
friend class MultiCommand;
};
@ -266,6 +275,6 @@ extern bool pathCompletions;
std::optional<std::string> needsCompletion(std::string_view s);
void completePath(size_t, std::string_view s);
void completePath(size_t, std::string_view prefix);
}

12
src/nix/cat.cc
View file

@ -25,7 +25,11 @@ struct CmdCatStore : StoreCommand, MixCat
{
CmdCatStore()
{
expectPathArg("path", &path);
expectArgs({
.label = "path",
.handler = {&path},
.completer = completePath
});
}
std::string description() override
@ -47,7 +51,11 @@ struct CmdCatNar : StoreCommand, MixCat
CmdCatNar()
{
expectPathArg("nar", &narPath);
expectArgs({
.label = "nar",
.handler = {&narPath},
.completer = completePath
});
expectArg("path", &path);
}

5
src/nix/command.hh
View file

@ -73,10 +73,7 @@ struct InstallablesCommand : virtual Args, SourceExprCommand
{
std::vector<std::shared_ptr<Installable>> installables;
InstallablesCommand()
{
expectArgs("installables", &_installables);
}
InstallablesCommand();
void prepare() override;

6
src/nix/hash.cc
View file

@ -31,7 +31,11 @@ struct CmdHash : Command
.labels({"modulus"})
.dest(&modulus);
#endif
expectPathArgs("paths", &paths);
expectArgs({
.label = "paths",
.handler = {&paths},
.completer = completePath
});
}
std::string description() override

8
src/nix/installables.cc
View file

@ -571,6 +571,14 @@ StorePathSet toDerivations(ref<Store> store,
return drvPaths;
}
InstallablesCommand::InstallablesCommand()
{
expectArgs({
.label = "installables",
.handler = {&_installables},
});
}
void InstallablesCommand::prepare()
{
if (_installables.empty() && useDefaultInstallables())

12
src/nix/ls.cc
View file

@ -85,7 +85,11 @@ struct CmdLsStore : StoreCommand, MixLs
{
CmdLsStore()
{
expectPathArg("path", &path);
expectArgs({
.label = "path",
.handler = {&path},
.completer = completePath
});
}
Examples examples() override
@ -117,7 +121,11 @@ struct CmdLsNar : Command, MixLs
CmdLsNar()
{
expectPathArg("nar", &narPath);
expectArgs({
.label = "nar",
.handler = {&narPath},
.completer = completePath
});
expectArg("path", &path);
}

6
src/nix/repl.cc
View file

@ -767,7 +767,11 @@ struct CmdRepl : StoreCommand, MixEvalArgs
CmdRepl()
{
expectPathArgs("files", &files);
expectArgs({
.label = "files",
.handler = {&files},
.completer = completePath
});
}
std::string description() override

6
src/nix/run.cc
View file

@ -149,7 +149,11 @@ struct CmdRun : InstallableCommand, RunCommon
CmdRun()
{
expectPathArgs("args", &args);
expectArgs({
.label = "args",
.handler = {&args},
.completer = completePath
});
}
std::string description() override