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/*
* Copyright (c) 2020, The SerenityOS developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "Job.h"
#include "Parser.h"
#include <AK/CircularQueue.h>
#include <AK/HashMap.h>
#include <AK/String.h>
#include <AK/StringBuilder.h>
#include <AK/Types.h>
#include <AK/Vector.h>
#include <LibCore/Notifier.h>
#include <LibCore/Object.h>
#include <LibLine/Editor.h>
#include <termios.h>
#define ENUMERATE_SHELL_BUILTINS() \
__ENUMERATE_SHELL_BUILTIN(alias) \
__ENUMERATE_SHELL_BUILTIN(cd) \
__ENUMERATE_SHELL_BUILTIN(cdh) \
__ENUMERATE_SHELL_BUILTIN(pwd) \
__ENUMERATE_SHELL_BUILTIN(exit) \
__ENUMERATE_SHELL_BUILTIN(export) \
__ENUMERATE_SHELL_BUILTIN(unset) \
__ENUMERATE_SHELL_BUILTIN(history) \
__ENUMERATE_SHELL_BUILTIN(umask) \
__ENUMERATE_SHELL_BUILTIN(dirs) \
__ENUMERATE_SHELL_BUILTIN(pushd) \
__ENUMERATE_SHELL_BUILTIN(popd) \
__ENUMERATE_SHELL_BUILTIN(setopt) \
__ENUMERATE_SHELL_BUILTIN(time) \
__ENUMERATE_SHELL_BUILTIN(jobs) \
__ENUMERATE_SHELL_BUILTIN(disown) \
__ENUMERATE_SHELL_BUILTIN(fg) \
__ENUMERATE_SHELL_BUILTIN(bg)
#define ENUMERATE_SHELL_OPTIONS() \
__ENUMERATE_SHELL_OPTION(inline_exec_keep_empty_segments, false, "Keep empty segments in inline execute $(...)") \
__ENUMERATE_SHELL_OPTION(verbose, false, "Announce every command that is about to be executed")
class Shell;
class Shell : public Core::Object {
C_OBJECT(Shell);
public:
constexpr static auto local_init_file_path = "~/.shellrc";
constexpr static auto global_init_file_path = "/etc/shellrc";
int run_command(const StringView&);
RefPtr<Job> run_command(const AST::Command&);
Vector<RefPtr<Job>> run_commands(Vector<AST::Command>&);
bool run_file(const String&, bool explicitly_invoked = true);
bool run_builtin(int argc, const char** argv, int& retval);
bool has_builtin(const StringView&) const;
void block_on_job(RefPtr<Job>);
String prompt() const;
static String expand_tilde(const String&);
static Vector<String> expand_globs(const StringView& path, StringView base);
static Vector<String> expand_globs(Vector<StringView> path_segments, const StringView& base);
Vector<AST::Command> expand_aliases(Vector<AST::Command>);
String resolve_path(String) const;
String resolve_alias(const String&) const;
RefPtr<AST::Value> lookup_local_variable(const String&);
String local_variable_or(const String&, const String&);
void set_local_variable(const String&, RefPtr<AST::Value>);
void unset_local_variable(const String&);
struct LocalFrame {
HashMap<String, RefPtr<AST::Value>> local_variables;
};
struct Frame {
Frame(Vector<LocalFrame>& frames, const LocalFrame& frame)
: frames(frames)
, frame(frame)
{
}
~Frame();
void leak_frame() { should_destroy_frame = false; }
private:
Vector<LocalFrame>& frames;
const LocalFrame& frame;
bool should_destroy_frame { true };
};
[[nodiscard]] Frame push_frame();
void pop_frame();
static String escape_token(const String& token);
static String unescape_token(const String& token);
static bool is_glob(const StringView&);
static Vector<StringView> split_path(const StringView&);
void highlight(Line::Editor&) const;
Vector<Line::CompletionSuggestion> complete(const Line::Editor&);
Vector<Line::CompletionSuggestion> complete_path(const String& base, const String&, size_t offset);
Vector<Line::CompletionSuggestion> complete_program_name(const String&, size_t offset);
Vector<Line::CompletionSuggestion> complete_variable(const String&, size_t offset);
Vector<Line::CompletionSuggestion> complete_user(const String&, size_t offset);
Vector<Line::CompletionSuggestion> complete_option(const String&, const String&, size_t offset);
void restore_stdin();
u64 find_last_job_id() const;
const Job* find_job(u64 id);
const Job* current_job() const { return m_current_job; }
void kill_job(const Job*, int sig);
String get_history_path();
void load_history();
void save_history();
void print_path(const String& path);
bool read_single_line();
struct termios termios;
struct termios default_termios;
bool was_interrupted { false };
bool was_resized { false };
String cwd;
String username;
String home;
constexpr static auto TTYNameSize = 32;
constexpr static auto HostNameSize = 64;
char ttyname[TTYNameSize];
char hostname[HostNameSize];
uid_t uid;
int last_return_code { 0 };
Vector<String> directory_stack;
CircularQueue<String, 8> cd_history; // FIXME: have a configurable cd history length
HashMap<u64, RefPtr<Job>> jobs;
Vector<String, 256> cached_path;
enum ShellEventType {
ReadLine,
};
#define __ENUMERATE_SHELL_OPTION(name, default_, description) \
bool name { default_ };
struct Options {
ENUMERATE_SHELL_OPTIONS();
} options;
#undef __ENUMERATE_SHELL_OPTION
private:
Shell();
virtual ~Shell() override;
// ^Core::Object
virtual void save_to(JsonObject&) override;
void cache_path();
void stop_all_jobs();
const Job* m_current_job { nullptr };
LocalFrame* find_frame_containing_local_variable(const String& name);
virtual void custom_event(Core::CustomEvent&) override;
#define __ENUMERATE_SHELL_BUILTIN(builtin) \
int builtin_##builtin(int argc, const char** argv);
ENUMERATE_SHELL_BUILTINS();
#undef __ENUMERATE_SHELL_BUILTIN
constexpr static const char* builtin_names[] = {
#define __ENUMERATE_SHELL_BUILTIN(builtin) #builtin,
ENUMERATE_SHELL_BUILTINS()
#undef __ENUMERATE_SHELL_BUILTIN
};
StringBuilder m_complete_line_builder;
bool m_should_ignore_jobs_on_next_exit { false };
pid_t m_pid { 0 };
Vector<LocalFrame> m_local_frames;
HashMap<String, String> m_aliases;
};
static constexpr bool is_word_character(char c)
{
return c == '_' || (c <= 'Z' && c >= 'A') || (c <= 'z' && c >= 'a');
}
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