mirror of
https://github.com/SerenityOS/serenity
synced 2024-07-22 02:26:11 +00:00
275 lines
11 KiB
C++
275 lines
11 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "Shell.h"
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#include <AK/LexicalPath.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/Event.h>
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#include <LibCore/EventLoop.h>
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#include <LibCore/System.h>
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#include <LibFileSystem/FileSystem.h>
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#include <LibMain/Main.h>
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#include <signal.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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RefPtr<Line::Editor> editor;
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Shell::Shell* s_shell;
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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Core::EventLoop loop;
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Core::EventLoop::register_signal(SIGINT, [](int) {
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s_shell->kill_job(s_shell->current_job(), SIGINT);
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});
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Core::EventLoop::register_signal(SIGWINCH, [](int) {
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s_shell->kill_job(s_shell->current_job(), SIGWINCH);
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});
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Core::EventLoop::register_signal(SIGTTIN, [](int) {});
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Core::EventLoop::register_signal(SIGTTOU, [](int) {});
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Core::EventLoop::register_signal(SIGHUP, [](int) {
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for (auto& it : s_shell->jobs)
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s_shell->kill_job(it.value.ptr(), SIGHUP);
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s_shell->editor()->save_history(s_shell->get_history_path());
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});
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TRY(Core::System::pledge("stdio rpath wpath cpath proc exec tty sigaction unix fattr"));
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RefPtr<::Shell::Shell> shell;
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bool attempt_interactive = false;
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auto initialize = [&](bool posix_mode) {
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auto configuration = Line::Configuration::from_config();
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if (!attempt_interactive) {
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configuration.set(Line::Configuration::Flags::None);
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configuration.set(Line::Configuration::SignalHandler::NoSignalHandlers);
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configuration.set(Line::Configuration::OperationMode::NonInteractive);
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configuration.set(Line::Configuration::RefreshBehavior::Eager);
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}
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editor = Line::Editor::construct(move(configuration));
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editor->initialize();
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shell = Shell::Shell::construct(*editor, attempt_interactive, posix_mode);
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s_shell = shell.ptr();
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s_shell->setup_signals();
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sigset_t blocked;
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sigemptyset(&blocked);
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sigaddset(&blocked, SIGTTOU);
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sigaddset(&blocked, SIGTTIN);
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pthread_sigmask(SIG_BLOCK, &blocked, nullptr);
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shell->termios = editor->termios();
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shell->default_termios = editor->default_termios();
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editor->on_display_refresh = [&](auto& editor) {
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editor.strip_styles();
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if (shell->should_format_live()) {
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auto line = editor.line();
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ssize_t cursor = editor.cursor();
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editor.clear_line();
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editor.insert(shell->format(line, cursor));
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if (cursor >= 0)
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editor.set_cursor(cursor);
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}
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(void)shell->highlight(editor);
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};
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editor->on_tab_complete = [&](const Line::Editor&) {
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return shell->complete();
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};
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editor->on_paste = [&](Utf32View data, Line::Editor& editor) {
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auto line = editor.line(editor.cursor());
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Shell::Parser parser(line, false);
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auto ast = parser.parse();
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if (!ast) {
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editor.insert(data);
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return;
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}
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auto hit_test_result = ast->hit_test_position(editor.cursor());
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// If the argument isn't meant to be an entire command, escape it.
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// This allows copy-pasting entire commands where commands are expected, and otherwise escapes everything.
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auto should_escape = false;
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if (!hit_test_result.matching_node && hit_test_result.closest_command_node) {
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// There's *some* command, but our cursor is immediate after it
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should_escape = editor.cursor() >= hit_test_result.closest_command_node->position().end_offset;
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hit_test_result.matching_node = hit_test_result.closest_command_node;
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} else if (hit_test_result.matching_node && hit_test_result.closest_command_node) {
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// There's a command, and we're at the end of or in the middle of some node.
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auto leftmost_literal = hit_test_result.closest_command_node->leftmost_trivial_literal();
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if (leftmost_literal)
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should_escape = !hit_test_result.matching_node->position().contains(leftmost_literal->position().start_offset);
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}
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if (should_escape) {
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DeprecatedString escaped_string;
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Optional<char> trivia {};
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bool starting_trivia_already_provided = false;
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auto escape_mode = Shell::Shell::EscapeMode::Bareword;
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if (hit_test_result.matching_node->kind() == Shell::AST::Node::Kind::StringLiteral) {
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// If we're pasting in a string literal, make sure to only consider that specific escape mode
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auto* node = static_cast<Shell::AST::StringLiteral const*>(hit_test_result.matching_node.ptr());
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switch (node->enclosure_type()) {
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case Shell::AST::StringLiteral::EnclosureType::None:
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break;
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case Shell::AST::StringLiteral::EnclosureType::SingleQuotes:
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escape_mode = Shell::Shell::EscapeMode::SingleQuotedString;
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trivia = '\'';
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starting_trivia_already_provided = true;
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break;
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case Shell::AST::StringLiteral::EnclosureType::DoubleQuotes:
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escape_mode = Shell::Shell::EscapeMode::DoubleQuotedString;
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trivia = '"';
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starting_trivia_already_provided = true;
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break;
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}
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}
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if (starting_trivia_already_provided) {
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escaped_string = shell->escape_token(data, escape_mode);
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} else {
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escaped_string = shell->escape_token(data, Shell::Shell::EscapeMode::Bareword);
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if (auto string = shell->escape_token(data, Shell::Shell::EscapeMode::SingleQuotedString); string.length() + 2 < escaped_string.length()) {
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escaped_string = move(string);
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trivia = '\'';
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}
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if (auto string = shell->escape_token(data, Shell::Shell::EscapeMode::DoubleQuotedString); string.length() + 2 < escaped_string.length()) {
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escaped_string = move(string);
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trivia = '"';
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}
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}
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if (trivia.has_value() && !starting_trivia_already_provided)
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editor.insert(*trivia);
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editor.insert(escaped_string);
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if (trivia.has_value())
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editor.insert(*trivia);
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} else {
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editor.insert(data);
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}
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};
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};
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StringView command_to_run = {};
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StringView file_to_read_from = {};
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Vector<StringView> script_args;
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bool skip_rc_files = false;
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StringView format;
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bool should_format_live = false;
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bool keep_open = false;
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bool posix_mode = (LexicalPath::basename(arguments.strings[0]) == "sh"sv);
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Core::ArgsParser parser;
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parser.add_option(command_to_run, "String to read commands from", "command-string", 'c', "command-string");
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parser.add_option(skip_rc_files, "Skip running shellrc files", "skip-shellrc", 0);
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parser.add_option(format, "Format the given file into stdout and exit", "format", 0, "file");
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parser.add_option(should_format_live, "Enable live formatting", "live-formatting", 'f');
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parser.add_option(keep_open, "Keep the shell open after running the specified command or file", "keep-open", 0);
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parser.add_option(posix_mode, "Behave like a POSIX-compatible shell", "posix", 0);
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parser.add_positional_argument(file_to_read_from, "File to read commands from", "file", Core::ArgsParser::Required::No);
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parser.add_positional_argument(script_args, "Extra arguments to pass to the script (via $* and co)", "argument", Core::ArgsParser::Required::No);
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parser.set_stop_on_first_non_option(true);
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parser.parse(arguments);
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if (!file_to_read_from.is_null())
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skip_rc_files = true;
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if (!format.is_empty()) {
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auto file = TRY(Core::File::open(format, Core::File::OpenMode::Read));
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initialize(posix_mode);
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ssize_t cursor = -1;
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puts(shell->format(TRY(file->read_until_eof()), cursor).characters());
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return 0;
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}
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auto pid = getpid();
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if (auto sid = getsid(pid); sid == 0) {
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if (auto res = Core::System::setsid(); res.is_error())
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dbgln("{}", res.release_error());
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} else if (sid != pid) {
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if (getpgid(pid) != pid) {
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if (auto res = Core::System::setpgid(pid, sid); res.is_error())
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dbgln("{}", res.release_error());
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if (auto res = Core::System::setsid(); res.is_error())
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dbgln("{}", res.release_error());
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}
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}
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auto execute_file = !file_to_read_from.is_empty() && "-"sv != file_to_read_from;
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attempt_interactive = !execute_file && (command_to_run.is_empty() || keep_open);
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if (keep_open && command_to_run.is_empty() && !execute_file) {
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warnln("Option --keep-open can only be used in combination with -c or when specifying a file to execute.");
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return 1;
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}
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initialize(posix_mode);
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shell->set_live_formatting(should_format_live);
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shell->current_script = arguments.strings[0];
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if (!skip_rc_files) {
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auto run_rc_file = [&](auto& name) {
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DeprecatedString file_path = name;
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if (file_path.starts_with('~'))
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file_path = shell->expand_tilde(file_path);
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if (FileSystem::exists(file_path)) {
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shell->run_file(file_path, false);
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}
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};
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if (posix_mode) {
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run_rc_file(Shell::Shell::global_posix_init_file_path);
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run_rc_file(Shell::Shell::local_posix_init_file_path);
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} else {
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run_rc_file(Shell::Shell::global_init_file_path);
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run_rc_file(Shell::Shell::local_init_file_path);
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}
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shell->cache_path();
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}
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Vector<String> args_to_pass;
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TRY(args_to_pass.try_ensure_capacity(script_args.size()));
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for (auto& arg : script_args)
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TRY(args_to_pass.try_append(TRY(String::from_utf8(arg))));
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shell->set_local_variable("ARGV", adopt_ref(*new Shell::AST::ListValue(move(args_to_pass))));
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if (!command_to_run.is_empty()) {
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auto result = shell->run_command(command_to_run);
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if (!keep_open)
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return result;
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}
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if (execute_file) {
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auto result = shell->run_file(file_to_read_from);
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if (!keep_open) {
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if (result)
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return 0;
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return 1;
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}
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}
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shell->add_child(*editor);
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Core::EventLoop::current().post_event(*shell, make<Core::CustomEvent>(Shell::Shell::ShellEventType::ReadLine));
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return loop.exec();
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}
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