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find: Add ! operator to negate the following command

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Tim Ledbetter 2023-08-31 22:26:19 +01:00 committed by Andrew Kaster
parent 6952de73dc
commit d277d2e1fb
Notes: sideshowbarker 2024-07-17 09:48:50 +09:00 
Author: https://github.com/tcl3
Commit: https://github.com/SerenityOS/serenity/commit/d277d2e1fb
Pull-request: https://github.com/SerenityOS/serenity/pull/20896
Reviewed-by: https://github.com/gmta
2 changed files with 26 additions and 4 deletions
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1
Base/usr/share/man/man1/find.md
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@ -78,6 +78,7 @@ by the current user.
The commands can be combined to form complex expressions using the following
operators:
* `! command`: Logical NOT.
* `command1 -o command2`: Logical OR.
* `command1 -a command2`, `command1 command2`: Logical AND.
* `( command )`: Groups commands together for operator priority purposes.

29
Userland/Utilities/find.cpp
View file

@ -512,6 +512,22 @@ private:
NonnullOwnPtr<Command> m_rhs;
};
class NotCommand final : public Command {
public:
NotCommand(NonnullOwnPtr<Command>&& operand)
: m_operand(move(operand))
{
}
private:
virtual bool evaluate(FileData& file_data) const override
{
return !m_operand->evaluate(file_data);
}
NonnullOwnPtr<Command> m_operand;
};
static OwnPtr<Command> parse_complex_command(Vector<char*>& args);
// Parse a simple command starting at optind; leave optind at its the last
@ -529,6 +545,12 @@ static OwnPtr<Command> parse_simple_command(Vector<char*>& args)
if (command && !args.is_empty() && StringView { args.first(), strlen(args.first()) } == ")")
return command;
fatal_error("Unmatched \033[1m(");
} else if (arg == "!") {
if (args.is_empty())
fatal_error("Expected an expression after '!'");
auto command = parse_simple_command(args).release_nonnull();
return make<NotCommand>(move(command));
} else if (arg == "-type") {
if (args.is_empty())
fatal_error("-type: requires additional arguments");
@ -746,12 +768,11 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
StringView arg { raw_arg, strlen(raw_arg) };
if (arg == "-L") {
g_follow_symlinks = true;
} else if (!arg.starts_with('-')) {
paths.append(LexicalPath(arg));
} else {
// No special case, so add back the argument and try to parse a command.
} else if (arg.starts_with('-') || arg == "!"sv) {
args.prepend(raw_arg);
command = parse_all_commands(args);
} else {
paths.append(LexicalPath(arg));
}
}