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Shell: Implement the return POSIX builtin

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This is also available in the regular shell mode, as it's a generally
useful builtin to have.
This commit is contained in:
Ali Mohammad Pur 2023-10-16 21:21:22 +03:30 • committed by Andrew Kaster
parent 2d1c5dbfcb
commit a8c7448ccb
4 changed files with 25 additions and 1 deletions
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2
Userland/Shell/AST.cpp
View file

@ -1230,7 +1230,7 @@ ErrorOr<RefPtr<Value>> ForLoop::run(RefPtr<Shell> shell)
size_t consecutive_interruptions = 0;
auto run = [&](auto& block_value) {
if (shell->has_error(Shell::ShellError::InternalControlFlowBreak)) {
if (shell->has_error(Shell::ShellError::InternalControlFlowBreak) || shell->has_error(Shell::ShellError::InternalControlFlowReturn)) {
shell->take_error();
return IterationDecision::Break;
}

17
Userland/Shell/Builtin.cpp
View file

@ -268,6 +268,23 @@ ErrorOr<int> Shell::builtin_continue(Main::Arguments arguments)
return 0;
}
ErrorOr<int> Shell::builtin_return(Main::Arguments arguments)
{
int return_code = last_return_code.value_or(0);
Core::ArgsParser parser;
parser.add_positional_argument(return_code, "Return code to return to the parent shell", "return-code", Core::ArgsParser::Required::No);
parser.set_general_help("Return from a function or source file");
if (!parser.parse(arguments, Core::ArgsParser::FailureBehavior::PrintUsage))
return 1;
last_return_code = return_code & 0xff;
raise_error(ShellError::InternalControlFlowReturn, "POSIX return");
return 0;
}
ErrorOr<int> Shell::builtin_bg(Main::Arguments arguments)
{
int job_id = -1;

4
Userland/Shell/Shell.cpp
View file

@ -487,6 +487,9 @@ bool Shell::invoke_function(const AST::Command& command, int& retval)
(void)function.body->run(*this);
if (has_error(ShellError::InternalControlFlowReturn))
take_error();
retval = last_return_code.value_or(0);
return true;
}
@ -2435,6 +2438,7 @@ void Shell::possibly_print_error() const
break;
case ShellError::InternalControlFlowBreak:
case ShellError::InternalControlFlowContinue:
case ShellError::InternalControlFlowReturn:
case ShellError::InternalControlFlowInterrupted:
case ShellError::InternalControlFlowKilled:
return;

3
Userland/Shell/Shell.h
View file

@ -60,6 +60,7 @@
__ENUMERATE_SHELL_BUILTIN(noop, InAllModes) \
__ENUMERATE_SHELL_BUILTIN(break, OnlyInPOSIXMode) \
__ENUMERATE_SHELL_BUILTIN(continue, OnlyInPOSIXMode) \
__ENUMERATE_SHELL_BUILTIN(return, InAllModes) \
__ENUMERATE_SHELL_BUILTIN(read, OnlyInPOSIXMode) \
__ENUMERATE_SHELL_BUILTIN(run_with_env, OnlyInPOSIXMode) \
__ENUMERATE_SHELL_BUILTIN(argsparser_parse, InAllModes) \
@ -360,6 +361,7 @@ public:
None,
InternalControlFlowBreak,
InternalControlFlowContinue,
InternalControlFlowReturn,
InternalControlFlowInterrupted,
InternalControlFlowKilled,
EvaluatedSyntaxError,
@ -396,6 +398,7 @@ public:
switch (error) {
case ShellError::InternalControlFlowBreak:
case ShellError::InternalControlFlowContinue:
case ShellError::InternalControlFlowReturn:
case ShellError::InternalControlFlowInterrupted:
case ShellError::InternalControlFlowKilled:
return true;