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/*
* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Assertions.h>
#include <AK/ByteBuffer.h>
#include <AK/String.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/File.h>
#include <LibMarkdown/Document.h>
#include <fcntl.h>
#include <spawn.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <unistd.h>
static pid_t pipe_to_pager(String const& command)
{
char const* argv[] = { "sh", "-c", command.characters(), nullptr };
int stdout_pipe[2] = {};
if (pipe2(stdout_pipe, O_CLOEXEC)) {
perror("pipe2");
exit(1);
}
posix_spawn_file_actions_t action;
posix_spawn_file_actions_init(&action);
posix_spawn_file_actions_adddup2(&action, stdout_pipe[0], STDIN_FILENO);
pid_t pid;
if ((errno = posix_spawnp(&pid, argv[0], &action, nullptr, const_cast<char**>(argv), environ))) {
perror("posix_spawn");
exit(1);
}
posix_spawn_file_actions_destroy(&action);
dup2(stdout_pipe[1], STDOUT_FILENO);
close(stdout_pipe[1]);
close(stdout_pipe[0]);
return pid;
}
int main(int argc, char* argv[])
{
int view_width = 0;
if (isatty(STDOUT_FILENO)) {
struct winsize ws;
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == 0)
view_width = ws.ws_col;
}
if (view_width == 0)
view_width = 80;
if (pledge("stdio rpath exec proc", nullptr) < 0) {
perror("pledge");
return 1;
}
if (unveil("/usr/share/man", "r") < 0) {
perror("unveil");
return 1;
}
if (unveil("/bin", "x") < 0) {
perror("unveil");
return 1;
}
unveil(nullptr, nullptr);
const char* section = nullptr;
const char* name = nullptr;
const char* pager = nullptr;
Core::ArgsParser args_parser;
args_parser.set_general_help("Read manual pages. Try 'man man' to get started.");
args_parser.add_positional_argument(section, "Section of the man page", "section", Core::ArgsParser::Required::No);
args_parser.add_positional_argument(name, "Name of the man page", "name");
args_parser.add_option(pager, "Pager to pipe the man page to", "pager", 'P', "pager");
args_parser.parse(argc, argv);
auto make_path = [name](const char* section) {
return String::formatted("/usr/share/man/man{}/{}.md", section, name);
};
if (!section) {
const char* sections[] = {
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8"
};
for (auto s : sections) {
String path = make_path(s);
if (access(path.characters(), R_OK) == 0) {
section = s;
break;
}
}
if (!section) {
warnln("No man page for {}", name);
exit(1);
}
}
auto file = Core::File::construct();
file->set_filename(make_path(section));
String pager_command;
if (pager)
pager_command = pager;
else
pager_command = String::formatted("less -P 'Manual Page {}({}) line %l?e (END):.'", StringView(name).replace("'", "'\\''"), StringView(section).replace("'", "'\\''"));
pid_t pager_pid = pipe_to_pager(pager_command);
if (!file->open(Core::OpenMode::ReadOnly)) {
perror("Failed to open man page file");
exit(1);
}
if (pledge("stdio proc", nullptr) < 0) {
perror("pledge");
return 1;
}
dbgln("Loading man page from {}", file->filename());
auto buffer = file->read_all();
auto source = String::copy(buffer);
outln("{}({})\t\tSerenityOS manual", name, section);
auto document = Markdown::Document::parse(source);
VERIFY(document);
String rendered = document->render_for_terminal(view_width);
out("{}", rendered);
// FIXME: Remove this wait, it shouldn't be necessary but Shell does not
// resume properly without it. This wait also breaks <C-z> backgrounding
fclose(stdout);
int wstatus;
waitpid(pager_pid, &wstatus, 0);
}
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