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Implement a suggestions mechanism

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Each `Error` class now includes a set of suggestions, and these are printed by
the top-level handler.
This commit is contained in:
regnat 2022-03-03 10:50:35 +01:00
parent b09baf690b
commit c0792b1546
7 changed files with 191 additions and 6 deletions
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9
src/libutil/args.cc
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@ -328,8 +328,13 @@ MultiCommand::MultiCommand(const Commands & commands_)
completions->add(name);
}
auto i = commands.find(s);
if (i == commands.end())
throw UsageError("'%s' is not a recognised command", s);
if (i == commands.end()) {
std::set<std::string> commandNames;
for (auto & [name, _] : commands)
commandNames.insert(name);
auto suggestions = Suggestions::bestMatches(commandNames, s);
throw UsageError(suggestions, "'%s' is not a recognised command", s);
}
command = {s, i->second()};
command->second->parent = this;
}}