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Shell: Add builtin command to reset the internal state

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The new builtin command "reset" now resets the entire internal state by
virtually destructing the Shell state and re-constructing it.

This helps for example when setting a new hostname and wanting to view
it in the current Shell program.
This commit is contained in:
Liav A 2023-08-11 13:11:15 +03:00 committed by Ali Mohammad Pur
parent 489fce0ed2
commit fb60db7b00
Notes: sideshowbarker 2024-07-17 07:14:09 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/fb60db7b00
Pull-request: https://github.com/SerenityOS/serenity/pull/20491
Reviewed-by: https://github.com/alimpfard
3 changed files with 27 additions and 3 deletions
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11
Userland/Shell/Builtin.cpp
View File

@ -149,6 +149,17 @@ ErrorOr<int> Shell::builtin_where(Main::Arguments arguments)
return at_least_one_succeded ? 0 : 1;
}
ErrorOr<int> Shell::builtin_reset(Main::Arguments)
{
destroy();
initialize(m_is_interactive);
// NOTE: As the last step before returning, clear (flush) the shell text entirely.
fprintf(stderr, "\033[3J\033[H\033[2J");
fflush(stderr);
return 0;
}
ErrorOr<int> Shell::builtin_alias(Main::Arguments arguments)
{
Vector<DeprecatedString> aliases;

15
Userland/Shell/Shell.cpp
View File

@ -2258,9 +2258,7 @@ Shell::Shell()
cache_path();
}
Shell::Shell(Line::Editor& editor, bool attempt_interactive, bool posix_mode)
: m_in_posix_mode(posix_mode)
, m_editor(editor)
void Shell::initialize(bool attempt_interactive)
{
uid = getuid();
tcsetpgrp(0, getpgrp());
@ -2305,11 +2303,22 @@ Shell::Shell(Line::Editor& editor, bool attempt_interactive, bool posix_mode)
m_editor->load_history(get_history_path());
cache_path();
}
}
Shell::Shell(Line::Editor& editor, bool attempt_interactive, bool posix_mode)
: m_in_posix_mode(posix_mode)
, m_editor(editor)
{
initialize(attempt_interactive);
start_timer(3000);
}
Shell::~Shell()
{
destroy();
}
void Shell::destroy()
{
if (m_default_constructed)
return;

4
Userland/Shell/Shell.h
View File

@ -54,6 +54,7 @@
__ENUMERATE_SHELL_BUILTIN(wait, InAllModes) \
__ENUMERATE_SHELL_BUILTIN(dump, InAllModes) \
__ENUMERATE_SHELL_BUILTIN(kill, InAllModes) \
__ENUMERATE_SHELL_BUILTIN(reset, InAllModes) \
__ENUMERATE_SHELL_BUILTIN(noop, InAllModes) \
__ENUMERATE_SHELL_BUILTIN(break, OnlyInPOSIXMode) \
__ENUMERATE_SHELL_BUILTIN(continue, OnlyInPOSIXMode) \
@ -414,6 +415,9 @@ private:
Shell();
virtual ~Shell() override;
void destroy();
void initialize(bool attempt_interactive);
RefPtr<AST::Node> parse(StringView, bool interactive = false, bool as_command = true) const;
void timer_event(Core::TimerEvent&) override;