AK: Move Stream and SeekableStream from LibCore

`Stream` will be qualified as `AK::Stream` until we remove the
`Core::Stream` namespace. `IODevice` now reuses the `SeekMode` that is
defined by `SeekableStream`, since defining its own would require us to
qualify it with `AK::SeekMode` everywhere.

Userland/Utilities/gml-format.cpp

@@ -26,7 +26,7 @@ static ErrorOr<bool> format_file(StringView path, bool inplace)
     if (inplace && !read_from_stdin) {
         if (formatted_gml == contents)
             return true;
-        TRY(file->seek(0, Core::Stream::SeekMode::SetPosition));
+        TRY(file->seek(0, SeekMode::SetPosition));
         TRY(file->truncate(0));
         TRY(file->write(formatted_gml.bytes()));
     } else {

Userland/Utilities/gunzip.cpp

@@ -10,7 +10,7 @@
 #include <LibMain/Main.h>
 #include <unistd.h>
 
-static ErrorOr<void> decompress_file(NonnullOwnPtr<Core::Stream::File> input_stream, Core::Stream::Stream& output_stream)
+static ErrorOr<void> decompress_file(NonnullOwnPtr<Core::Stream::File> input_stream, AK::Stream& output_stream)
 {
     auto gzip_stream = Compress::GzipDecompressor { move(input_stream) };
 

Userland/Utilities/headless-browser.cpp

@@ -336,7 +336,7 @@ public:
             return false;
         }
 
-        virtual void stream_into(Core::Stream::Stream&) override
+        virtual void stream_into(AK::Stream&) override
         {
         }
 
@@ -415,7 +415,7 @@ public:
             return false;
         }
 
-        virtual void stream_into(Core::Stream::Stream&) override
+        virtual void stream_into(AK::Stream&) override
         {
         }
 
@@ -484,7 +484,7 @@ public:
             return false;
         }
 
-        virtual void stream_into(Core::Stream::Stream&) override
+        virtual void stream_into(AK::Stream&) override
         {
         }
 

Userland/Utilities/hexdump.cpp

@@ -39,7 +39,7 @@ ErrorOr<int> serenity_main(Main::Arguments args)
 
     auto file = TRY(Core::Stream::File::open_file_or_standard_stream(path, Core::Stream::OpenMode::Read));
     if (seek_to.has_value())
-        TRY(file->seek(seek_to.value(), Core::Stream::SeekMode::SetPosition));
+        TRY(file->seek(seek_to.value(), SeekMode::SetPosition));
 
     auto print_line = [](Bytes line) {
         VERIFY(line.size() <= LINE_LENGTH_BYTES);

Userland/Utilities/js.cpp

@@ -84,7 +84,7 @@ static DeprecatedString s_history_path = DeprecatedString::formatted("{}/.js-his
 static int s_repl_line_level = 0;
 static bool s_fail_repl = false;
 
-static ErrorOr<void> print(JS::Value value, Core::Stream::Stream& stream)
+static ErrorOr<void> print(JS::Value value, AK::Stream& stream)
 {
     JS::PrintContext print_context { .vm = *g_vm, .stream = stream, .strip_ansi = s_strip_ansi };
     return JS::print(value, print_context);

Userland/Utilities/pro.cpp

@@ -104,9 +104,9 @@ private:
 
 /// Wraps a stream to silently ignore writes when the condition isn't true.
 template<typename ConditionT>
-class ConditionalOutputStream final : public Core::Stream::Stream {
+class ConditionalOutputStream final : public AK::Stream {
 public:
-    ConditionalOutputStream(ConditionT&& condition, MaybeOwned<Core::Stream::Stream> stream)
+    ConditionalOutputStream(ConditionT&& condition, MaybeOwned<AK::Stream> stream)
         : m_stream(move(stream))
         , m_condition(condition)
     {
@@ -141,7 +141,7 @@ public:
     }
 
 private:
-    MaybeOwned<Core::Stream::Stream> m_stream;
+    MaybeOwned<AK::Stream> m_stream;
     ConditionT m_condition;
 };
 

Userland/Utilities/tail.cpp

@@ -14,7 +14,7 @@
 
 static ErrorOr<void> tail_from_pos(Core::Stream::File& file, off_t startline)
 {
-    TRY(file.seek(startline + 1, Core::Stream::SeekMode::SetPosition));
+    TRY(file.seek(startline + 1, SeekMode::SetPosition));
     auto buffer = TRY(file.read_until_eof());
     out("{}", StringView { buffer });
     return {};
@@ -24,13 +24,13 @@ static ErrorOr<off_t> find_seek_pos(Core::Stream::File& file, int wanted_lines)
 {
     // Rather than reading the whole file, start at the end and work backwards,
     // stopping when we've found the number of lines we want.
-    off_t pos = TRY(file.seek(0, Core::Stream::SeekMode::FromEndPosition));
+    off_t pos = TRY(file.seek(0, SeekMode::FromEndPosition));
 
     off_t end = pos;
     int lines = 0;
 
     for (; pos >= 0; pos--) {
-        TRY(file.seek(pos, Core::Stream::SeekMode::SetPosition));
+        TRY(file.seek(pos, SeekMode::SetPosition));
 
         if (file.is_eof())
             break;
@@ -102,7 +102,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     TRY(tail_from_pos(*f, pos));
 
     if (follow) {
-        TRY(f->seek(0, Core::Stream::SeekMode::FromEndPosition));
+        TRY(f->seek(0, SeekMode::FromEndPosition));
 
         Core::EventLoop event_loop;
         auto watcher = TRY(Core::FileWatcher::create());
@@ -118,7 +118,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
                 auto bytes = buffer_or_error.value().bytes();
                 out("{}", StringView { bytes });
 
-                auto potential_error = f->seek(0, Core::Stream::SeekMode::FromEndPosition);
+                auto potential_error = f->seek(0, SeekMode::FromEndPosition);
                 if (potential_error.is_error()) {
                     auto error = potential_error.error();
                     warnln(error.string_literal());

Userland/Utilities/tar.cpp

@@ -64,7 +64,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         if (!directory.is_empty())
             TRY(Core::System::chdir(directory));
 
-        NonnullOwnPtr<Core::Stream::Stream> input_stream = TRY(Core::Stream::File::open_file_or_standard_stream(archive_file, Core::Stream::OpenMode::Read));
+        NonnullOwnPtr<AK::Stream> input_stream = TRY(Core::Stream::File::open_file_or_standard_stream(archive_file, Core::Stream::OpenMode::Read));
 
         if (gzip)
             input_stream = make<Compress::GzipDecompressor>(move(input_stream));
@@ -206,7 +206,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
             return 1;
         }
 
-        NonnullOwnPtr<Core::Stream::Stream> output_stream = TRY(Core::Stream::File::standard_output());
+        NonnullOwnPtr<AK::Stream> output_stream = TRY(Core::Stream::File::standard_output());
 
         if (!archive_file.is_empty())
             output_stream = TRY(Core::Stream::File::open(archive_file, Core::Stream::OpenMode::Write));

Userland/Utilities/utmpupdate.cpp

@@ -70,7 +70,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         json.remove(tty_name);
     }
 
-    TRY(file->seek(0, Core::Stream::SeekMode::SetPosition));
+    TRY(file->seek(0, SeekMode::SetPosition));
     TRY(file->truncate(0));
     TRY(file->write(json.to_deprecated_string().bytes()));
 

Userland/Utilities/wasm.cpp

@@ -19,7 +19,7 @@
 #include <unistd.h>
 
 RefPtr<Line::Editor> g_line_editor;
-static OwnPtr<Core::Stream::Stream> g_stdout {};
+static OwnPtr<AK::Stream> g_stdout {};
 static OwnPtr<Wasm::Printer> g_printer {};
 static bool g_continue { false };
 static void (*old_signal)(int);