mirror of
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0e26f2657e
The builtin is based on the behaviour of the z-shell.
Namely it tries to resolve every argument one by one.
When resolving (in the order below) the following results can occur:
1. The argument is a shell built-in command. Then print it.
2. The argument is an alias. In this case we print the mapped value.
3. The argument was found in the `PATH` environment variable.
In this case we print the resolved absolute path
and try to find more occurences in the `PATH` environment variable.
4. None of the above. If no earlier argument got resolved,
we print the error `{argument} not found`.
If at least one argument got resolved we exit with exit code 0,
otherwise 1.
By not using Core::File to resolve the executable in the environment
but rather using a modified version of the code we print every
matching executable of the given name. This behaviour matches
up with the z-shell.
The builtin has the following flags to modify the behaviour according
to the users needs:
- `-p --path-only`: This skips the built-in and alias checks
(step 1 & 2)
- `-s --follow-symlink`: This follows the symlinks of an executable to
its symlink-free location.
- `-w --type`: This displays the type of the found object
without any additional descriptive information.
558 lines
18 KiB
C++
558 lines
18 KiB
C++
/*
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* Copyright (c) 2020-2022, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include "Job.h"
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#include "Parser.h"
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#include <AK/Array.h>
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#include <AK/CircularQueue.h>
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#include <AK/DeprecatedString.h>
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#include <AK/HashMap.h>
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#include <AK/NonnullOwnPtrVector.h>
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#include <AK/StackInfo.h>
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#include <AK/StringBuilder.h>
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#include <AK/StringView.h>
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#include <AK/Types.h>
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#include <AK/Vector.h>
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#include <LibCore/Notifier.h>
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#include <LibCore/Object.h>
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#include <LibLine/Editor.h>
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#include <termios.h>
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#define ENUMERATE_SHELL_BUILTINS() \
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__ENUMERATE_SHELL_BUILTIN(alias) \
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__ENUMERATE_SHELL_BUILTIN(where) \
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__ENUMERATE_SHELL_BUILTIN(cd) \
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__ENUMERATE_SHELL_BUILTIN(cdh) \
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__ENUMERATE_SHELL_BUILTIN(pwd) \
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__ENUMERATE_SHELL_BUILTIN(type) \
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__ENUMERATE_SHELL_BUILTIN(exec) \
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__ENUMERATE_SHELL_BUILTIN(exit) \
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__ENUMERATE_SHELL_BUILTIN(export) \
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__ENUMERATE_SHELL_BUILTIN(glob) \
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__ENUMERATE_SHELL_BUILTIN(unalias) \
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__ENUMERATE_SHELL_BUILTIN(unset) \
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__ENUMERATE_SHELL_BUILTIN(history) \
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__ENUMERATE_SHELL_BUILTIN(umask) \
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__ENUMERATE_SHELL_BUILTIN(not ) \
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__ENUMERATE_SHELL_BUILTIN(dirs) \
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__ENUMERATE_SHELL_BUILTIN(pushd) \
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__ENUMERATE_SHELL_BUILTIN(popd) \
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__ENUMERATE_SHELL_BUILTIN(setopt) \
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__ENUMERATE_SHELL_BUILTIN(shift) \
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__ENUMERATE_SHELL_BUILTIN(source) \
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__ENUMERATE_SHELL_BUILTIN(time) \
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__ENUMERATE_SHELL_BUILTIN(jobs) \
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__ENUMERATE_SHELL_BUILTIN(disown) \
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__ENUMERATE_SHELL_BUILTIN(fg) \
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__ENUMERATE_SHELL_BUILTIN(bg) \
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__ENUMERATE_SHELL_BUILTIN(wait) \
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__ENUMERATE_SHELL_BUILTIN(dump) \
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__ENUMERATE_SHELL_BUILTIN(kill) \
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__ENUMERATE_SHELL_BUILTIN(noop) \
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__ENUMERATE_SHELL_BUILTIN(argsparser_parse)
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#define ENUMERATE_SHELL_OPTIONS() \
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__ENUMERATE_SHELL_OPTION(inline_exec_keep_empty_segments, false, "Keep empty segments in inline execute $(...)") \
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__ENUMERATE_SHELL_OPTION(verbose, false, "Announce every command that is about to be executed") \
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__ENUMERATE_SHELL_OPTION(invoke_program_for_autocomplete, false, "Attempt to use the program being completed itself for autocompletion via --complete")
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#define ENUMERATE_SHELL_IMMEDIATE_FUNCTIONS() \
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__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(concat_lists) \
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__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(length) \
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__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(length_across) \
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__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(remove_suffix) \
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__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(remove_prefix) \
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__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(regex_replace) \
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__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(filter_glob) \
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__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(split) \
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__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(join)
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namespace Shell {
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class Shell;
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class Shell : public Core::Object {
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C_OBJECT(Shell);
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public:
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constexpr static auto local_init_file_path = "~/.shellrc";
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constexpr static auto global_init_file_path = "/etc/shellrc";
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bool should_format_live() const { return m_should_format_live; }
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void set_live_formatting(bool value) { m_should_format_live = value; }
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void setup_signals();
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struct SourcePosition {
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DeprecatedString source_file;
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DeprecatedString literal_source_text;
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Optional<AST::Position> position;
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};
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struct RunnablePath {
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enum class Kind {
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Builtin,
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Function,
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Alias,
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Executable,
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};
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Kind kind;
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DeprecatedString path;
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bool operator<(RunnablePath const& other) const
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{
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return path < other.path;
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}
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bool operator==(RunnablePath const&) const = default;
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};
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struct RunnablePathComparator {
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int operator()(RunnablePath const& lhs, RunnablePath const& rhs)
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{
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if (lhs.path > rhs.path)
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return 1;
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if (lhs.path < rhs.path)
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return -1;
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return 0;
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}
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int operator()(StringView lhs, RunnablePath const& rhs)
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{
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if (lhs > rhs.path)
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return 1;
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if (lhs < rhs.path)
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return -1;
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return 0;
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}
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};
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int run_command(StringView, Optional<SourcePosition> = {});
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Optional<RunnablePath> runnable_path_for(StringView);
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Optional<DeprecatedString> help_path_for(Vector<RunnablePath> visited, RunnablePath const& runnable_path);
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ErrorOr<RefPtr<Job>> run_command(const AST::Command&);
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NonnullRefPtrVector<Job> run_commands(Vector<AST::Command>&);
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bool run_file(DeprecatedString const&, bool explicitly_invoked = true);
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bool run_builtin(const AST::Command&, NonnullRefPtrVector<AST::Rewiring> const&, int& retval);
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bool has_builtin(StringView) const;
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RefPtr<AST::Node> run_immediate_function(StringView name, AST::ImmediateExpression& invoking_node, NonnullRefPtrVector<AST::Node> const&);
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static bool has_immediate_function(StringView);
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void block_on_job(RefPtr<Job>);
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void block_on_pipeline(RefPtr<AST::Pipeline>);
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DeprecatedString prompt() const;
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static DeprecatedString expand_tilde(StringView expression);
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static Vector<DeprecatedString> expand_globs(StringView path, StringView base);
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static Vector<DeprecatedString> expand_globs(Vector<StringView> path_segments, StringView base);
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Vector<AST::Command> expand_aliases(Vector<AST::Command>);
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DeprecatedString resolve_path(DeprecatedString) const;
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DeprecatedString resolve_alias(StringView) const;
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static bool has_history_event(StringView);
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RefPtr<AST::Value> get_argument(size_t) const;
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RefPtr<AST::Value> lookup_local_variable(StringView) const;
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DeprecatedString local_variable_or(StringView, DeprecatedString const&) const;
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void set_local_variable(DeprecatedString const&, RefPtr<AST::Value>, bool only_in_current_frame = false);
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void unset_local_variable(StringView, bool only_in_current_frame = false);
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void define_function(DeprecatedString name, Vector<DeprecatedString> argnames, RefPtr<AST::Node> body);
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bool has_function(StringView);
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bool invoke_function(const AST::Command&, int& retval);
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DeprecatedString format(StringView, ssize_t& cursor) const;
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RefPtr<Line::Editor> editor() const { return m_editor; }
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struct LocalFrame {
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LocalFrame(DeprecatedString name, HashMap<DeprecatedString, RefPtr<AST::Value>> variables)
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: name(move(name))
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, local_variables(move(variables))
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{
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}
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DeprecatedString name;
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HashMap<DeprecatedString, RefPtr<AST::Value>> local_variables;
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};
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struct Frame {
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Frame(NonnullOwnPtrVector<LocalFrame>& frames, LocalFrame const& frame)
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: frames(frames)
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, frame(frame)
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{
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}
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~Frame();
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void leak_frame() { should_destroy_frame = false; }
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private:
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NonnullOwnPtrVector<LocalFrame>& frames;
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LocalFrame const& frame;
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bool should_destroy_frame { true };
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};
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[[nodiscard]] Frame push_frame(DeprecatedString name);
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void pop_frame();
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struct Promise {
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struct Data {
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struct Unveil {
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DeprecatedString path;
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DeprecatedString access;
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};
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DeprecatedString exec_promises;
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Vector<Unveil> unveils;
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} data;
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IntrusiveListNode<Promise> node;
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using List = IntrusiveList<&Promise::node>;
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};
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struct ScopedPromise {
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ScopedPromise(Promise::List& promises, Promise&& promise)
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: promises(promises)
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, promise(move(promise))
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{
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promises.append(this->promise);
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}
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~ScopedPromise()
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{
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promises.remove(promise);
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}
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Promise::List& promises;
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Promise promise;
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};
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[[nodiscard]] ScopedPromise promise(Promise::Data data)
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{
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return { m_active_promises, { move(data), {} } };
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}
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enum class EscapeMode {
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Bareword,
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SingleQuotedString,
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DoubleQuotedString,
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};
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static DeprecatedString escape_token_for_double_quotes(StringView token);
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static DeprecatedString escape_token_for_single_quotes(StringView token);
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static DeprecatedString escape_token(StringView token, EscapeMode = EscapeMode::Bareword);
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static DeprecatedString escape_token(Utf32View token, EscapeMode = EscapeMode::Bareword);
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static DeprecatedString unescape_token(StringView token);
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enum class SpecialCharacterEscapeMode {
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Untouched,
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Escaped,
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QuotedAsEscape,
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QuotedAsHex,
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};
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static SpecialCharacterEscapeMode special_character_escape_mode(u32 c, EscapeMode);
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static bool is_glob(StringView);
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static Vector<StringView> split_path(StringView);
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enum class ExecutableOnly {
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Yes,
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No
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};
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void highlight(Line::Editor&) const;
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Vector<Line::CompletionSuggestion> complete();
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Vector<Line::CompletionSuggestion> complete(StringView);
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Vector<Line::CompletionSuggestion> complete_program_name(StringView, size_t offset, EscapeMode = EscapeMode::Bareword);
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Vector<Line::CompletionSuggestion> complete_variable(StringView, size_t offset);
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Vector<Line::CompletionSuggestion> complete_user(StringView, size_t offset);
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Vector<Line::CompletionSuggestion> complete_immediate_function_name(StringView, size_t offset);
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Vector<Line::CompletionSuggestion> complete_path(StringView base, StringView, size_t offset, ExecutableOnly executable_only, AST::Node const* command_node, AST::Node const*, EscapeMode = EscapeMode::Bareword);
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Vector<Line::CompletionSuggestion> complete_option(StringView, StringView, size_t offset, AST::Node const* command_node, AST::Node const*);
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ErrorOr<Vector<Line::CompletionSuggestion>> complete_via_program_itself(size_t offset, AST::Node const* command_node, AST::Node const*, EscapeMode escape_mode, StringView known_program_name);
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void restore_ios();
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u64 find_last_job_id() const;
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Job const* find_job(u64 id, bool is_pid = false);
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Job const* current_job() const { return m_current_job; }
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void kill_job(Job const*, int sig);
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DeprecatedString get_history_path();
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void print_path(StringView path);
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void cache_path();
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bool read_single_line();
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void notify_child_event();
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struct termios termios;
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struct termios default_termios;
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bool was_interrupted { false };
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bool was_resized { false };
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DeprecatedString cwd;
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DeprecatedString username;
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DeprecatedString home;
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constexpr static auto TTYNameSize = 32;
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constexpr static auto HostNameSize = 64;
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char ttyname[TTYNameSize];
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char hostname[HostNameSize];
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uid_t uid;
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Optional<int> last_return_code;
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Vector<DeprecatedString> directory_stack;
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CircularQueue<DeprecatedString, 8> cd_history; // FIXME: have a configurable cd history length
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HashMap<u64, NonnullRefPtr<Job>> jobs;
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Vector<RunnablePath, 256> cached_path;
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DeprecatedString current_script;
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enum ShellEventType {
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ReadLine,
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};
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enum class ShellError {
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None,
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InternalControlFlowBreak,
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InternalControlFlowContinue,
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InternalControlFlowInterrupted,
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InternalControlFlowKilled,
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EvaluatedSyntaxError,
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NonExhaustiveMatchRules,
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InvalidGlobError,
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InvalidSliceContentsError,
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OpenFailure,
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OutOfMemory,
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LaunchError,
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};
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void raise_error(ShellError kind, DeprecatedString description, Optional<AST::Position> position = {})
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{
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m_error = kind;
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m_error_description = move(description);
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if (m_source_position.has_value() && position.has_value())
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m_source_position.value().position = position.release_value();
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}
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bool has_error(ShellError err) const { return m_error == err; }
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bool has_any_error() const { return !has_error(ShellError::None); }
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DeprecatedString const& error_description() const { return m_error_description; }
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ShellError take_error()
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{
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auto err = m_error;
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m_error = ShellError::None;
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m_error_description = {};
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return err;
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}
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void possibly_print_error() const;
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static bool is_control_flow(ShellError error)
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{
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switch (error) {
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case ShellError::InternalControlFlowBreak:
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case ShellError::InternalControlFlowContinue:
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case ShellError::InternalControlFlowInterrupted:
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case ShellError::InternalControlFlowKilled:
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return true;
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default:
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return false;
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}
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}
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#define __ENUMERATE_SHELL_OPTION(name, default_, description) \
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bool name { default_ };
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struct Options {
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ENUMERATE_SHELL_OPTIONS();
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} options;
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#undef __ENUMERATE_SHELL_OPTION
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private:
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Shell(Line::Editor&, bool attempt_interactive);
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Shell();
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virtual ~Shell() override;
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void timer_event(Core::TimerEvent&) override;
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bool is_allowed_to_modify_termios(const AST::Command&) const;
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// FIXME: Port to Core::Property
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void save_to(JsonObject&);
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void bring_cursor_to_beginning_of_a_line() const;
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Optional<int> resolve_job_spec(StringView);
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void add_entry_to_cache(RunnablePath const&);
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void remove_entry_from_cache(StringView);
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void stop_all_jobs();
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Job const* m_current_job { nullptr };
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LocalFrame* find_frame_containing_local_variable(StringView name);
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LocalFrame const* find_frame_containing_local_variable(StringView name) const
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{
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return const_cast<Shell*>(this)->find_frame_containing_local_variable(name);
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}
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void run_tail(RefPtr<Job>);
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void run_tail(const AST::Command&, const AST::NodeWithAction&, int head_exit_code);
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[[noreturn]] void execute_process(Vector<char const*>&& argv);
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virtual void custom_event(Core::CustomEvent&) override;
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#define __ENUMERATE_SHELL_IMMEDIATE_FUNCTION(name) \
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RefPtr<AST::Node> immediate_##name(AST::ImmediateExpression& invoking_node, NonnullRefPtrVector<AST::Node> const&);
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ENUMERATE_SHELL_IMMEDIATE_FUNCTIONS();
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#undef __ENUMERATE_SHELL_IMMEDIATE_FUNCTION
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RefPtr<AST::Node> immediate_length_impl(AST::ImmediateExpression& invoking_node, NonnullRefPtrVector<AST::Node> const&, bool across);
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#define __ENUMERATE_SHELL_BUILTIN(builtin) \
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int builtin_##builtin(int argc, char const** argv);
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ENUMERATE_SHELL_BUILTINS();
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#undef __ENUMERATE_SHELL_BUILTIN
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static constexpr Array builtin_names = {
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#define __ENUMERATE_SHELL_BUILTIN(builtin) #builtin##sv,
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ENUMERATE_SHELL_BUILTINS()
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#undef __ENUMERATE_SHELL_BUILTIN
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":"sv, // POSIX-y name for "noop".
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};
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bool m_should_ignore_jobs_on_next_exit { false };
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pid_t m_pid { 0 };
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struct ShellFunction {
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DeprecatedString name;
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Vector<DeprecatedString> arguments;
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RefPtr<AST::Node> body;
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};
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HashMap<DeprecatedString, ShellFunction> m_functions;
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NonnullOwnPtrVector<LocalFrame> m_local_frames;
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Promise::List m_active_promises;
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NonnullRefPtrVector<AST::Redirection> m_global_redirections;
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HashMap<DeprecatedString, DeprecatedString> m_aliases;
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bool m_is_interactive { true };
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bool m_is_subshell { false };
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bool m_should_reinstall_signal_handlers { true };
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ShellError m_error { ShellError::None };
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DeprecatedString m_error_description;
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Optional<SourcePosition> m_source_position;
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bool m_should_format_live { false };
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RefPtr<Line::Editor> m_editor;
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bool m_default_constructed { false };
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mutable bool m_last_continuation_state { false }; // false == not needed.
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Optional<size_t> m_history_autosave_time;
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StackInfo m_completion_stack_info;
|
|
};
|
|
|
|
[[maybe_unused]] static constexpr bool is_word_character(char c)
|
|
{
|
|
return c == '_' || (c <= 'Z' && c >= 'A') || (c <= 'z' && c >= 'a') || (c <= '9' && c >= '0');
|
|
}
|
|
|
|
inline size_t find_offset_into_node(StringView unescaped_text, size_t escaped_offset, Shell::EscapeMode escape_mode)
|
|
{
|
|
size_t unescaped_offset = 0;
|
|
size_t offset = 0;
|
|
auto do_find_offset = [&](auto& unescaped_text) {
|
|
for (auto c : unescaped_text) {
|
|
if (offset == escaped_offset)
|
|
return unescaped_offset;
|
|
|
|
switch (Shell::special_character_escape_mode(c, escape_mode)) {
|
|
case Shell::SpecialCharacterEscapeMode::Untouched:
|
|
break;
|
|
case Shell::SpecialCharacterEscapeMode::Escaped:
|
|
++offset; // X -> \X
|
|
break;
|
|
case Shell::SpecialCharacterEscapeMode::QuotedAsEscape:
|
|
switch (escape_mode) {
|
|
case Shell::EscapeMode::Bareword:
|
|
offset += 3; // X -> "\Y"
|
|
break;
|
|
case Shell::EscapeMode::SingleQuotedString:
|
|
offset += 5; // X -> '"\Y"'
|
|
break;
|
|
case Shell::EscapeMode::DoubleQuotedString:
|
|
offset += 1; // X -> \Y
|
|
break;
|
|
}
|
|
break;
|
|
case Shell::SpecialCharacterEscapeMode::QuotedAsHex:
|
|
switch (escape_mode) {
|
|
case Shell::EscapeMode::Bareword:
|
|
offset += 2; // X -> "\..."
|
|
break;
|
|
case Shell::EscapeMode::SingleQuotedString:
|
|
offset += 4; // X -> '"\..."'
|
|
break;
|
|
case Shell::EscapeMode::DoubleQuotedString:
|
|
// X -> \...
|
|
break;
|
|
}
|
|
if (c > NumericLimits<u8>::max())
|
|
offset += 8; // X -> "\uhhhhhhhh"
|
|
else
|
|
offset += 3; // X -> "\xhh"
|
|
break;
|
|
}
|
|
++offset;
|
|
++unescaped_offset;
|
|
}
|
|
return unescaped_offset;
|
|
};
|
|
|
|
Utf8View view { unescaped_text };
|
|
if (view.validate())
|
|
return do_find_offset(view);
|
|
return do_find_offset(unescaped_text);
|
|
}
|
|
|
|
}
|
|
|
|
namespace AK {
|
|
|
|
template<>
|
|
struct Traits<Shell::Shell::RunnablePath> : public GenericTraits<Shell::Shell::RunnablePath> {
|
|
static constexpr bool is_trivial() { return false; }
|
|
|
|
static bool equals(Shell::Shell::RunnablePath const& self, Shell::Shell::RunnablePath const& other)
|
|
{
|
|
return self == other;
|
|
}
|
|
|
|
static bool equals(Shell::Shell::RunnablePath const& self, StringView other)
|
|
{
|
|
return self.path == other;
|
|
}
|
|
|
|
static bool equals(Shell::Shell::RunnablePath const& self, DeprecatedString const& other)
|
|
{
|
|
return self.path == other;
|
|
}
|
|
};
|
|
|
|
}
|