forked from lix-project/lix
453c3a603f
This is probably what most people expect it to do. Fixes #3781. There is a new command 'nix flake lock' that has the old behaviour of 'nix flake update', i.e. it just adds missing lock file entries unless overriden using --update-input.
375 lines
11 KiB
C++
375 lines
11 KiB
C++
#include "args.hh"
|
|
#include "hash.hh"
|
|
|
|
#include <glob.h>
|
|
|
|
#include <nlohmann/json.hpp>
|
|
|
|
namespace nix {
|
|
|
|
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 != "");
|
|
longFlags[flag->longName] = flag;
|
|
for (auto & alias : flag->aliases)
|
|
longFlags[alias] = flag;
|
|
if (flag->shortName) shortFlags[flag->shortName] = flag;
|
|
}
|
|
|
|
void Args::removeFlag(const std::string & longName)
|
|
{
|
|
auto flag = longFlags.find(longName);
|
|
assert(flag != longFlags.end());
|
|
if (flag->second->shortName) shortFlags.erase(flag->second->shortName);
|
|
longFlags.erase(flag);
|
|
}
|
|
|
|
void Completions::add(std::string completion, std::string description)
|
|
{
|
|
assert(description.find('\n') == std::string::npos);
|
|
insert(Completion {
|
|
.completion = completion,
|
|
.description = description
|
|
});
|
|
}
|
|
|
|
bool Completion::operator<(const Completion & other) const
|
|
{ return completion < other.completion || (completion == other.completion && description < other.description); }
|
|
|
|
bool pathCompletions = false;
|
|
std::shared_ptr<Completions> completions;
|
|
|
|
std::string completionMarker = "___COMPLETE___";
|
|
|
|
std::optional<std::string> needsCompletion(std::string_view s)
|
|
{
|
|
if (!completions) return {};
|
|
auto i = s.find(completionMarker);
|
|
if (i != std::string::npos)
|
|
return std::string(s.begin(), i);
|
|
return {};
|
|
}
|
|
|
|
void Args::parseCmdline(const Strings & _cmdline)
|
|
{
|
|
Strings pendingArgs;
|
|
bool dashDash = false;
|
|
|
|
Strings cmdline(_cmdline);
|
|
|
|
if (auto s = getEnv("NIX_GET_COMPLETIONS")) {
|
|
size_t n = std::stoi(*s);
|
|
assert(n > 0 && n <= cmdline.size());
|
|
*std::next(cmdline.begin(), n - 1) += completionMarker;
|
|
completions = std::make_shared<decltype(completions)::element_type>();
|
|
verbosity = lvlError;
|
|
}
|
|
|
|
bool argsSeen = false;
|
|
for (auto pos = cmdline.begin(); pos != cmdline.end(); ) {
|
|
|
|
auto arg = *pos;
|
|
|
|
/* Expand compound dash options (i.e., `-qlf' -> `-q -l -f',
|
|
`-j3` -> `-j 3`). */
|
|
if (!dashDash && arg.length() > 2 && arg[0] == '-' && arg[1] != '-' && isalpha(arg[1])) {
|
|
*pos = (string) "-" + arg[1];
|
|
auto next = pos; ++next;
|
|
for (unsigned int j = 2; j < arg.length(); j++)
|
|
if (isalpha(arg[j]))
|
|
cmdline.insert(next, (string) "-" + arg[j]);
|
|
else {
|
|
cmdline.insert(next, string(arg, j));
|
|
break;
|
|
}
|
|
arg = *pos;
|
|
}
|
|
|
|
if (!dashDash && arg == "--") {
|
|
dashDash = true;
|
|
++pos;
|
|
}
|
|
else if (!dashDash && std::string(arg, 0, 1) == "-") {
|
|
if (!processFlag(pos, cmdline.end()))
|
|
throw UsageError("unrecognised flag '%1%'", arg);
|
|
}
|
|
else {
|
|
if (!argsSeen) {
|
|
argsSeen = true;
|
|
initialFlagsProcessed();
|
|
}
|
|
pos = rewriteArgs(cmdline, pos);
|
|
pendingArgs.push_back(*pos++);
|
|
if (processArgs(pendingArgs, false))
|
|
pendingArgs.clear();
|
|
}
|
|
}
|
|
|
|
processArgs(pendingArgs, true);
|
|
|
|
if (!argsSeen)
|
|
initialFlagsProcessed();
|
|
}
|
|
|
|
bool Args::processFlag(Strings::iterator & pos, Strings::iterator end)
|
|
{
|
|
assert(pos != end);
|
|
|
|
auto process = [&](const std::string & name, const Flag & flag) -> bool {
|
|
++pos;
|
|
std::vector<std::string> args;
|
|
bool anyCompleted = false;
|
|
for (size_t n = 0 ; n < flag.handler.arity; ++n) {
|
|
if (pos == end) {
|
|
if (flag.handler.arity == ArityAny) break;
|
|
throw UsageError("flag '%s' requires %d argument(s)", name, flag.handler.arity);
|
|
}
|
|
if (flag.completer)
|
|
if (auto prefix = needsCompletion(*pos)) {
|
|
anyCompleted = true;
|
|
flag.completer(n, *prefix);
|
|
}
|
|
args.push_back(*pos++);
|
|
}
|
|
if (!anyCompleted)
|
|
flag.handler.fun(std::move(args));
|
|
return true;
|
|
};
|
|
|
|
if (string(*pos, 0, 2) == "--") {
|
|
if (auto prefix = needsCompletion(*pos)) {
|
|
for (auto & [name, flag] : longFlags) {
|
|
if (!hiddenCategories.count(flag->category)
|
|
&& hasPrefix(name, std::string(*prefix, 2)))
|
|
completions->add("--" + name, flag->description);
|
|
}
|
|
}
|
|
auto i = longFlags.find(string(*pos, 2));
|
|
if (i == longFlags.end()) return false;
|
|
return process("--" + i->first, *i->second);
|
|
}
|
|
|
|
if (string(*pos, 0, 1) == "-" && pos->size() == 2) {
|
|
auto c = (*pos)[1];
|
|
auto i = shortFlags.find(c);
|
|
if (i == shortFlags.end()) return false;
|
|
return process(std::string("-") + c, *i->second);
|
|
}
|
|
|
|
if (auto prefix = needsCompletion(*pos)) {
|
|
if (prefix == "-") {
|
|
completions->add("--");
|
|
for (auto & [flagName, flag] : shortFlags)
|
|
completions->add(std::string("-") + flagName, flag->description);
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool Args::processArgs(const Strings & args, bool finish)
|
|
{
|
|
if (expectedArgs.empty()) {
|
|
if (!args.empty())
|
|
throw UsageError("unexpected argument '%1%'", args.front());
|
|
return true;
|
|
}
|
|
|
|
auto & exp = expectedArgs.front();
|
|
|
|
bool res = false;
|
|
|
|
if ((exp.handler.arity == ArityAny && finish) ||
|
|
(exp.handler.arity != ArityAny && args.size() == exp.handler.arity))
|
|
{
|
|
std::vector<std::string> 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;
|
|
}
|
|
|
|
if (finish && !expectedArgs.empty() && !expectedArgs.front().optional)
|
|
throw UsageError("more arguments are required");
|
|
|
|
return res;
|
|
}
|
|
|
|
nlohmann::json Args::toJSON()
|
|
{
|
|
auto flags = nlohmann::json::object();
|
|
|
|
for (auto & [name, flag] : longFlags) {
|
|
auto j = nlohmann::json::object();
|
|
if (flag->aliases.count(name)) continue;
|
|
if (flag->shortName)
|
|
j["shortName"] = std::string(1, flag->shortName);
|
|
if (flag->description != "")
|
|
j["description"] = flag->description;
|
|
j["category"] = flag->category;
|
|
if (flag->handler.arity != ArityAny)
|
|
j["arity"] = flag->handler.arity;
|
|
if (!flag->labels.empty())
|
|
j["labels"] = flag->labels;
|
|
flags[name] = std::move(j);
|
|
}
|
|
|
|
auto args = nlohmann::json::array();
|
|
|
|
for (auto & arg : expectedArgs) {
|
|
auto j = nlohmann::json::object();
|
|
j["label"] = arg.label;
|
|
j["optional"] = arg.optional;
|
|
if (arg.handler.arity != ArityAny)
|
|
j["arity"] = arg.handler.arity;
|
|
args.push_back(std::move(j));
|
|
}
|
|
|
|
auto res = nlohmann::json::object();
|
|
res["description"] = description();
|
|
res["flags"] = std::move(flags);
|
|
res["args"] = std::move(args);
|
|
auto s = doc();
|
|
if (s != "") res.emplace("doc", stripIndentation(s));
|
|
return res;
|
|
}
|
|
|
|
static void hashTypeCompleter(size_t index, std::string_view prefix)
|
|
{
|
|
for (auto & type : hashTypes)
|
|
if (hasPrefix(type, prefix))
|
|
completions->add(type);
|
|
}
|
|
|
|
Args::Flag Args::Flag::mkHashTypeFlag(std::string && longName, HashType * ht)
|
|
{
|
|
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);
|
|
}},
|
|
.completer = hashTypeCompleter
|
|
};
|
|
}
|
|
|
|
Args::Flag Args::Flag::mkHashTypeOptFlag(std::string && longName, std::optional<HashType> * oht)
|
|
{
|
|
return Flag {
|
|
.longName = std::move(longName),
|
|
.description = "hash algorithm ('md5', 'sha1', 'sha256', or 'sha512'). Optional as can also be gotten from SRI hash itself.",
|
|
.labels = {"hash-algo"},
|
|
.handler = {[oht](std::string s) {
|
|
*oht = std::optional<HashType> { parseHashType(s) };
|
|
}},
|
|
.completer = hashTypeCompleter
|
|
};
|
|
}
|
|
|
|
static void _completePath(std::string_view prefix, bool onlyDirs)
|
|
{
|
|
pathCompletions = true;
|
|
glob_t globbuf;
|
|
int flags = GLOB_NOESCAPE | GLOB_TILDE;
|
|
#ifdef GLOB_ONLYDIR
|
|
if (onlyDirs)
|
|
flags |= GLOB_ONLYDIR;
|
|
#endif
|
|
if (glob((std::string(prefix) + "*").c_str(), flags, nullptr, &globbuf) == 0) {
|
|
for (size_t i = 0; i < globbuf.gl_pathc; ++i) {
|
|
if (onlyDirs) {
|
|
auto st = lstat(globbuf.gl_pathv[i]);
|
|
if (!S_ISDIR(st.st_mode)) continue;
|
|
}
|
|
completions->add(globbuf.gl_pathv[i]);
|
|
}
|
|
globfree(&globbuf);
|
|
}
|
|
}
|
|
|
|
void completePath(size_t, std::string_view prefix)
|
|
{
|
|
_completePath(prefix, false);
|
|
}
|
|
|
|
void completeDir(size_t, std::string_view prefix)
|
|
{
|
|
_completePath(prefix, true);
|
|
}
|
|
|
|
Strings argvToStrings(int argc, char * * argv)
|
|
{
|
|
Strings args;
|
|
argc--; argv++;
|
|
while (argc--) args.push_back(*argv++);
|
|
return args;
|
|
}
|
|
|
|
MultiCommand::MultiCommand(const Commands & commands_)
|
|
: commands(commands_)
|
|
{
|
|
expectArgs({
|
|
.label = "subcommand",
|
|
.optional = true,
|
|
.handler = {[=](std::string s) {
|
|
assert(!command);
|
|
if (auto prefix = needsCompletion(s)) {
|
|
for (auto & [name, command] : commands)
|
|
if (hasPrefix(name, *prefix))
|
|
completions->add(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";
|
|
}
|
|
|
|
bool MultiCommand::processFlag(Strings::iterator & pos, Strings::iterator end)
|
|
{
|
|
if (Args::processFlag(pos, end)) return true;
|
|
if (command && command->second->processFlag(pos, end)) return true;
|
|
return false;
|
|
}
|
|
|
|
bool MultiCommand::processArgs(const Strings & args, bool finish)
|
|
{
|
|
if (command)
|
|
return command->second->processArgs(args, finish);
|
|
else
|
|
return Args::processArgs(args, finish);
|
|
}
|
|
|
|
nlohmann::json MultiCommand::toJSON()
|
|
{
|
|
auto cmds = nlohmann::json::object();
|
|
|
|
for (auto & [name, commandFun] : commands) {
|
|
auto command = commandFun();
|
|
auto j = command->toJSON();
|
|
auto cat = nlohmann::json::object();
|
|
cat["id"] = command->category();
|
|
cat["description"] = categories[command->category()];
|
|
j["category"] = std::move(cat);
|
|
cmds[name] = std::move(j);
|
|
}
|
|
|
|
auto res = Args::toJSON();
|
|
res["commands"] = std::move(cmds);
|
|
return res;
|
|
}
|
|
|
|
}
|