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Userland: Port less(1) to LibMain

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Peter Elliott 2021-12-27 19:43:45 -07:00 committed by Andreas Kling
parent 6312742257
commit 20a0572de8
Notes: sideshowbarker 2024-07-17 22:01:46 +09:00 
Author: https://github.com/petelliott
Commit: https://github.com/SerenityOS/serenity/commit/20a0572de8e
Pull-request: https://github.com/SerenityOS/serenity/pull/11456
2 changed files with 19 additions and 24 deletions
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1
Userland/Utilities/CMakeLists.txt
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@ -105,6 +105,7 @@ target_link_libraries(ini LibMain)
target_link_libraries(jp LibMain)
target_link_libraries(js LibJS LibLine LibMain)
target_link_libraries(keymap LibKeyboard LibMain)
target_link_libraries(less LibMain)
target_link_libraries(logout LibMain)
target_link_libraries(ls LibMain)
target_link_libraries(lspci LibPCIDB LibMain)

42
Userland/Utilities/less.cpp
View file

@ -12,6 +12,8 @@
#include <AK/Utf8View.h>
#include <AK/Vector.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/System.h>
#include <LibMain/Main.h>
#include <csignal>
#include <ctype.h>
#include <fcntl.h>
@ -25,36 +27,34 @@ static struct termios g_save;
// Flag set by a SIGWINCH signal handler to notify the main loop that the window has been resized.
static Atomic<bool> g_resized { false };
static void setup_tty(bool switch_buffer)
static ErrorOr<void> setup_tty(bool switch_buffer)
{
// Save previous tty settings.
if (tcgetattr(STDOUT_FILENO, &g_save) == -1) {
perror("tcgetattr(3)");
}
g_save = TRY(Core::System::tcgetattr(STDOUT_FILENO));
struct termios raw = g_save;
raw.c_lflag &= ~(ECHO | ICANON);
// Disable echo and line buffering
if (tcsetattr(STDOUT_FILENO, TCSAFLUSH, &raw) == -1) {
perror("tcsetattr(3)");
}
TRY(Core::System::tcsetattr(STDOUT_FILENO, TCSAFLUSH, raw));
if (switch_buffer) {
// Save cursor and switch to alternate buffer.
out("\e[s\e[?1047h");
}
return {};
}
static void teardown_tty(bool switch_buffer)
static ErrorOr<void> teardown_tty(bool switch_buffer)
{
if (tcsetattr(STDOUT_FILENO, TCSAFLUSH, &g_save) == -1) {
perror("tcsetattr(3)");
}
TRY(Core::System::tcsetattr(STDOUT_FILENO, TCSAFLUSH, g_save));
if (switch_buffer) {
out("\e[?1047l\e[u");
}
return {};
}
static Vector<StringView> wrap_line(String const& string, size_t width)
@ -509,12 +509,9 @@ static void cat_file(FILE* file)
}
}
int main(int argc, char** argv)
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
if (pledge("stdio rpath tty sigaction", nullptr) < 0) {
perror("pledge");
return 1;
}
TRY(Core::System::pledge("stdio rpath tty sigaction", nullptr));
char const* filename = "-";
char const* prompt = "?f%f :.(line %l)?e (END):.";
@ -522,7 +519,7 @@ int main(int argc, char** argv)
bool quit_at_eof = false;
bool emulate_more = false;
if (LexicalPath::basename(argv[0]) == "more"sv)
if (LexicalPath::basename(arguments.strings[0]) == "more"sv)
emulate_more = true;
Core::ArgsParser args_parser;
@ -531,7 +528,7 @@ int main(int argc, char** argv)
args_parser.add_option(dont_switch_buffer, "Don't use xterm alternate buffer", "no-init", 'X');
args_parser.add_option(quit_at_eof, "Exit when the end of the file is reached", "quit-at-eof", 'e');
args_parser.add_option(emulate_more, "Pretend that we are more(1)", "emulate-more", 'm');
args_parser.parse(argc, argv);
args_parser.parse(arguments);
FILE* file;
if (String("-") == filename) {
@ -547,10 +544,7 @@ int main(int argc, char** argv)
g_resized = true;
});
if (pledge("stdio tty", nullptr) < 0) {
perror("pledge");
return 1;
}
TRY(Core::System::pledge("stdio tty", nullptr));
if (emulate_more) {
// Configure options that match more's behavior
@ -564,7 +558,7 @@ int main(int argc, char** argv)
return 0;
}
setup_tty(!dont_switch_buffer);
TRY(setup_tty(!dont_switch_buffer));
Pager pager(filename, file, stdout, prompt);
pager.init();
@ -634,6 +628,6 @@ int main(int argc, char** argv)
pager.clear_status();
teardown_tty(!dont_switch_buffer);
TRY(teardown_tty(!dont_switch_buffer));
return 0;
}