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banan-os/userspace/Shell/main.cpp

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#include <BAN/Optional.h>
#include <BAN/ScopeGuard.h>
#include <BAN/String.h>
#include <BAN/Vector.h>
#include <ctype.h>
#include <inttypes.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <termios.h>
#include <unistd.h>
#define ERROR_RETURN(__msg, __ret) do { perror(__msg); return __ret; } while (false)
struct termios old_termios, new_termios;
extern char** environ;
static const char* argv0 = nullptr;
static int last_return = 0;
static BAN::String hostname;
static void clean_exit()
{
tcsetattr(0, TCSANOW, &old_termios);
exit(0);
}
BAN::Vector<BAN::Vector<BAN::String>> parse_command(BAN::StringView);
BAN::Optional<BAN::String> parse_dollar(BAN::StringView command, size_t& i)
{
ASSERT(command[i] == '$');
if (++i >= command.size())
return "$"sv;
if (command[i] == '?')
{
i++;
return BAN::String::formatted("{}", last_return);
}
if (isalnum(command[i]))
{
size_t len = 1;
for (; i + len < command.size(); len++)
if (!isalnum(command[i + len]))
break;
BAN::String name = command.substring(i, len);
i += len - 1;
if (const char* value = getenv(name.data()))
return BAN::StringView(value);
return ""sv;
}
else if (command[i] == '{')
{
size_t len = 1;
for (; i + len < command.size(); len++)
{
if (command[i + len] == '}')
break;
if (!isalnum(command[i + len]))
return {};
}
if (i + len >= command.size())
return {};
BAN::String name = command.substring(i + 1, len - 1);
i += len;
if (const char* value = getenv(name.data()))
return BAN::StringView(value);
return ""sv;
}
else if (command[i] == '[')
{
return {};
}
else if (command[i] == '(')
{
size_t len = 1;
int count = 1;
for (; i + len < command.size(); len++)
{
if (command[i + len] == '(')
count++;
if (command[i + len] == ')')
count--;
if (count == 0)
break;
}
if (count != 0)
return {};
BAN::String subcommand = command.substring(i + 1, len - 1);
char temp[3] { '-', 'c', '\0' };
BAN::Vector<char*> argv;
MUST(argv.push_back((char*)argv0));
MUST(argv.push_back(temp));
MUST(argv.push_back((char*)subcommand.data()));
MUST(argv.push_back(nullptr));
int fds[2];
if (pipe(fds) == -1)
ERROR_RETURN("pipe", {});
pid_t pid = fork();
if (pid == 0)
{
if (dup2(fds[1], STDOUT_FILENO) == -1)
{
perror("dup2");
exit(1);
}
close(fds[0]);
close(fds[1]);
execv(argv.front(), argv.data());
perror("execv");
exit(1);
}
if (pid == -1)
ERROR_RETURN("fork", {});
close(fds[1]);
char buffer[100];
BAN::String output;
while (ssize_t ret = read(fds[0], buffer, sizeof(buffer)))
{
if (ret == -1)
{
perror("read");
break;
}
MUST(output.append(BAN::StringView(buffer, ret)));
}
close(fds[0]);
int status;
if (waitpid(pid, &status, 0) == -1 && errno != ECHILD)
ERROR_RETURN("waitpid", {});
while (!output.empty() && output.back() == '\n')
output.pop_back();
i += len;
return output;
}
BAN::String temp = "$"sv;
MUST(temp.push_back(command[i]));
return temp;
}
BAN::StringView strip_whitespace(BAN::StringView sv)
{
size_t leading = 0;
while (leading < sv.size() && isspace(sv[leading]))
leading++;
sv = sv.substring(leading);
size_t trailing = 0;
while (trailing < sv.size() && isspace(sv[sv.size() - trailing - 1]))
trailing++;
sv = sv.substring(0, sv.size() - trailing);
return sv;
}
BAN::Vector<BAN::Vector<BAN::String>> parse_command(BAN::StringView command_view)
{
enum class State
{
Normal,
SingleQuote,
DoubleQuote,
};
command_view = strip_whitespace(command_view);
BAN::Vector<BAN::Vector<BAN::String>> result;
BAN::Vector<BAN::String> command_args;
State state = State::Normal;
BAN::String current_arg;
for (size_t i = 0; i < command_view.size(); i++)
{
char c = command_view[i];
switch (state)
{
case State::Normal:
if (c == '\'')
state = State::SingleQuote;
else if (c == '"')
state = State::DoubleQuote;
else if (c == '$')
{
auto expansion = parse_dollar(command_view, i);
if (!expansion.has_value())
{
fprintf(stderr, "bad substitution\n");
return {};
}
MUST(current_arg.append(expansion.value()));
}
else if (c == '|')
{
if (!current_arg.empty())
MUST(command_args.push_back(current_arg));
current_arg.clear();
MUST(result.push_back(command_args));
command_args.clear();
}
else if (!isspace(c))
MUST(current_arg.push_back(c));
else
{
if (!current_arg.empty())
{
MUST(command_args.push_back(current_arg));
current_arg.clear();
}
}
break;
case State::SingleQuote:
if (c == '\'')
state = State::Normal;
else
MUST(current_arg.push_back(c));
break;
case State::DoubleQuote:
if (c == '"')
state = State::Normal;
else if (c != '$')
MUST(current_arg.push_back(c));
else
{
auto expansion = parse_dollar(command_view, i);
if (!expansion.has_value())
{
fprintf(stderr, "bad substitution\n");
return {};
}
MUST(current_arg.append(expansion.value()));
}
break;
}
}
// FIXME: handle state != State::Normal
MUST(command_args.push_back(BAN::move(current_arg)));
MUST(result.push_back(BAN::move(command_args)));
return result;
}
int execute_command(BAN::Vector<BAN::String>& args, int fd_in, int fd_out);
int source_script(const BAN::String& path);
BAN::Optional<int> execute_builtin(BAN::Vector<BAN::String>& args, int fd_in, int fd_out)
{
if (args.empty())
return 0;
FILE* fout = stdout;
bool should_close = false;
if (fd_out != STDOUT_FILENO)
{
int fd_dup = dup(fd_out);
if (fd_dup == -1)
ERROR_RETURN("dup", 1);
fout = fdopen(fd_dup, "w");
if (fout == nullptr)
ERROR_RETURN("fdopen", 1);
should_close = true;
}
BAN::ScopeGuard _([fout, should_close] { if (should_close) fclose(fout); });
if (args.front() == "clear"sv)
{
fprintf(fout, "\e[H\e[2J");
fflush(fout);
}
else if (args.front() == "exit"sv)
{
clean_exit();
}
else if (args.front() == "export"sv)
{
bool first = false;
for (const auto& arg : args)
{
if (first)
{
first = false;
continue;
}
auto split = MUST(arg.sv().split('=', true));
if (split.size() != 2)
continue;
if (setenv(BAN::String(split[0]).data(), BAN::String(split[1]).data(), true) == -1)
ERROR_RETURN("setenv", 1);
}
}
else if (args.front() == "source"sv)
{
if (args.size() != 2)
{
fprintf(fout, "usage: source FILE\n");
return 1;
}
return source_script(args[1]);
}
else if (args.front() == "env"sv)
{
char** current = environ;
while (*current)
fprintf(fout, "%s\n", *current++);
}
else if (args.front() == "start-gui"sv)
{
pid_t pid = fork();
if (pid == 0)
execl("/bin/WindowServer", "WindowServer", NULL);
if (fork() == 0)
execl("/bin/Terminal", "Terminal", NULL);
waitpid(pid, nullptr, 0);
}
else if (args.front() == "page-fault-test"sv)
{
volatile int* ptr = nullptr;
*ptr = 0;
}
else if (args.front() == "kill-test"sv)
{
pid_t pid = fork();
if (pid == 0)
{
fprintf(fout, "child\n");
for (;;);
}
if (pid == -1)
{
perror("fork");
return 1;
}
sleep(1);
if (kill(pid, SIGSEGV) == -1)
{
perror("kill");
return 1;
}
}
else if (args.front() == "signal-test"sv)
{
pid_t pid = fork();
if (pid == 0)
{
dup2(fileno(fout), STDOUT_FILENO);
if (signal(SIGSEGV, [](int) { printf("SIGSEGV\n"); }) == SIG_ERR)
{
perror("signal");
exit(1);
}
printf("child\n");
for (;;);
}
if (pid == -1)
{
perror("fork");
return 1;
}
sleep(1);
if (kill(pid, SIGSEGV) == -1)
{
perror("kill");
return 1;
}
sleep(1);
if (kill(pid, SIGTERM) == -1)
{
perror("kill");
return 1;
}
}
else if (args.front() == "printf-test"sv)
{
fprintf(fout, " 0.0: %f\n", 0.0f);
fprintf(fout, " 123.0: %f\n", 123.0f);
fprintf(fout, " 0.123: %f\n", 0.123f);
fprintf(fout, " NAN: %f\n", NAN);
fprintf(fout, "+INF: %f\n", INFINITY);
fprintf(fout, "-INF: %f\n", -INFINITY);
}
else if (args.front() == "cd"sv)
{
if (args.size() > 2)
{
fprintf(fout, "cd: too many arguments\n");
return 1;
}
BAN::StringView path;
if (args.size() == 1)
{
if (const char* path_env = getenv("HOME"))
path = path_env;
else
return 0;
}
else
path = args[1];
if (chdir(path.data()) == -1)
ERROR_RETURN("chdir", 1);
}
else if (args.front() == "time"sv)
{
args.remove(0);
timespec start, end;
if (clock_gettime(CLOCK_MONOTONIC, &start) == -1)
ERROR_RETURN("clock_gettime", 1);
int ret = execute_command(args, fd_in, fd_out);
if (clock_gettime(CLOCK_MONOTONIC, &end) == -1)
ERROR_RETURN("clock_gettime", 1);
uint64_t total_ns = 0;
total_ns += (end.tv_sec - start.tv_sec) * 1'000'000'000;
total_ns += end.tv_nsec - start.tv_nsec;
int secs = total_ns / 1'000'000'000;
int msecs = (total_ns % 1'000'000'000) / 1'000'000;
fprintf(fout, "took %d.%03d s\n", secs, msecs);
return ret;
}
else if (args.front() == "test-strtox")
{
#define TEST(num, base) do { errno = 0; printf("strtol(\"" num "\", nullptr, " #base ") = %ld ", strtol(num, nullptr, base)); puts(errno ? strerrorname_np(errno) : ""); } while (false)
TEST("0", 10);
TEST("", 10);
TEST("+", 10);
TEST("123", 10);
TEST("-123", 10);
TEST("7fffffffffffffff", 10);
TEST("7fffffffffffffff", 16);
TEST("8000000000000000", 16);
TEST("-8000000000000000", 16);
TEST("-8000000000000001", 16);
TEST("123", 0);
TEST("0123", 0);
TEST("0x123", 0);
TEST("123", 1);
TEST("hello", 10);
TEST("hello", 36);
#undef TEST
#define TEST(num, base) do { errno = 0; printf("strtoul(\"" num "\", nullptr, " #base ") = %lu ", strtoul(num, nullptr, base)); puts(errno ? strerrorname_np(errno) : ""); } while (false)
TEST("0", 10);
TEST("123", 10);
TEST("-123", 10);
TEST("-1", 10);
TEST("fffffffffffffff", 16);
TEST("ffffffffffffffff", 16);
TEST("10000000000000000", 16);
#undef TEST
#define TEST(num) do { errno = 0; printf("strtod(\"" num "\", nullptr) = %e ", strtod(num, nullptr)); puts(errno ? strerrorname_np(errno) : ""); } while (false)
TEST("0");
TEST(".1");
TEST("1.");
TEST("0x.1");
TEST("0x1.");
TEST("123");
TEST("-123");
TEST("0x123");
TEST("123.456");
TEST("-123.456");
TEST("1.2e5");
TEST("1.e5");
TEST(".2e5");
TEST("0x1.2p5");
TEST("0x1.p5");
TEST("0x.2p5");
TEST("1e999");
TEST("-1e999");
TEST("1e308");
TEST("1e-307");
TEST("1e309");
TEST("1e-308");
TEST("0.00000000001e312");
TEST("1000000000000e-312");
TEST("0e999");
TEST("0e-999");
TEST("1237754.446f");
TEST("inf");
TEST("-inf");
TEST("nan");
#undef TEST
}
else
{
return {};
}
return 0;
}
pid_t execute_command_no_wait(BAN::Vector<BAN::String>& args, int fd_in, int fd_out, pid_t pgrp)
{
if (args.empty())
return 0;
BAN::Vector<char*> cmd_args;
MUST(cmd_args.reserve(args.size() + 1));
for (const auto& arg : args)
MUST(cmd_args.push_back((char*)arg.data()));
MUST(cmd_args.push_back(nullptr));
// do PATH resolution
BAN::String executable_file;
if (!args.front().sv().contains('/'))
{
const char* path_env_cstr = getenv("PATH");
if (path_env_cstr == nullptr)
path_env_cstr = "";
auto path_env_list = MUST(BAN::StringView(path_env_cstr).split(':'));
for (auto path_env : path_env_list)
{
BAN::String test_file = path_env;
MUST(test_file.push_back('/'));
MUST(test_file.append(args.front()));
struct stat st;
if (stat(test_file.data(), &st) == 0)
{
executable_file = BAN::move(test_file);
break;
}
}
}
else
{
executable_file = args.front();
}
// Verify that the file exists is executable
{
struct stat st;
if (executable_file.empty() || stat(executable_file.data(), &st) == -1)
{
fprintf(stderr, "command not found: %s\n", args.front().data());
return -1;
}
if ((st.st_mode & 0111) == 0)
{
fprintf(stderr, "permission denied: %s\n", executable_file.data());
return -1;
}
}
pid_t pid = fork();
if (pid == 0)
{
if (fd_in != STDIN_FILENO)
{
if (dup2(fd_in, STDIN_FILENO) == -1)
{
perror("dup2");
exit(1);
}
close(fd_in);
}
if (fd_out != STDOUT_FILENO)
{
if (dup2(fd_out, STDOUT_FILENO) == -1)
{
perror("dup2");
exit(1);
}
close(fd_out);
}
if (pgrp == 0)
{
if(setpgid(0, 0) == -1)
{
perror("setpgid");
exit(1);
}
if (isatty(0) && tcsetpgrp(0, getpgrp()) == -1)
{
perror("tcsetpgrp");
exit(1);
}
}
else
{
setpgid(0, pgrp);
}
execv(executable_file.data(), cmd_args.data());
perror("execv");
exit(1);
}
if (pid == -1)
ERROR_RETURN("fork", -1);
return pid;
}
int execute_command(BAN::Vector<BAN::String>& args, int fd_in, int fd_out)
{
pid_t pid = execute_command_no_wait(args, fd_in, fd_out, 0);
if (pid == -1)
return 1;
int status;
if (waitpid(pid, &status, 0) == -1)
ERROR_RETURN("waitpid", 1);
if (isatty(0) && tcsetpgrp(0, getpgrp()) == -1)
ERROR_RETURN("tcsetpgrp", 1);
if (WIFSIGNALED(status))
fprintf(stderr, "Terminated by signal %d\n", WTERMSIG(status));
return WEXITSTATUS(status);
}
int execute_piped_commands(BAN::Vector<BAN::Vector<BAN::String>>& commands)
{
if (commands.empty())
return 0;
if (commands.size() == 1)
{
auto& command = commands.front();
if (auto ret = execute_builtin(command, STDIN_FILENO, STDOUT_FILENO); ret.has_value())
return ret.value();
return execute_command(command, STDIN_FILENO, STDOUT_FILENO);
}
BAN::Vector<int> exit_codes(commands.size(), 0);
BAN::Vector<pid_t> processes(commands.size(), -1);
pid_t pgrp = 0;
int next_stdin = STDIN_FILENO;
for (size_t i = 0; i < commands.size(); i++)
{
bool last = (i == commands.size() - 1);
int pipefd[2] { -1, STDOUT_FILENO };
if (!last && pipe(pipefd) == -1)
{
if (i > 0)
close(next_stdin);
perror("pipe");
break;
}
auto builtin_ret = execute_builtin(commands[i], next_stdin, pipefd[1]);
if (builtin_ret.has_value())
exit_codes[i] = builtin_ret.value();
else
{
pid_t pid = execute_command_no_wait(commands[i], next_stdin, pipefd[1], pgrp);
processes[i] = pid;
if (pgrp == 0)
pgrp = pid;
}
if (next_stdin != STDIN_FILENO)
close(next_stdin);
if (pipefd[1] != STDOUT_FILENO)
close(pipefd[1]);
next_stdin = pipefd[0];
}
for (size_t i = 0; i < commands.size(); i++)
{
if (processes[i] == -1)
continue;
int status;
if (waitpid(processes[i], &status, 0) == -1)
{
perror("waitpid");
exit_codes[i] = 69420;
continue;
}
if (WIFSIGNALED(status))
fprintf(stderr, "Terminated by signal %d\n", WTERMSIG(status));
if (WEXITSTATUS(status))
exit_codes[i] = WEXITSTATUS(status);
}
if (isatty(0) && tcsetpgrp(0, getpgrp()) == -1)
ERROR_RETURN("tcsetpgrp", 1);
return exit_codes.back();
}
int parse_and_execute_command(BAN::StringView command)
{
if (command.empty())
return 0;
auto parsed_commands = parse_command(command);
if (parsed_commands.empty())
return 0;
tcsetattr(0, TCSANOW, &old_termios);
int ret = execute_piped_commands(parsed_commands);
tcsetattr(0, TCSANOW, &new_termios);
return ret;
}
int source_script(const BAN::String& path)
{
FILE* fp = fopen(path.data(), "r");
if (fp == nullptr)
ERROR_RETURN("fopen", 1);
int ret = 0;
BAN::String command;
char temp_buffer[128];
while (fgets(temp_buffer, sizeof(temp_buffer), fp))
{
MUST(command.append(temp_buffer));
if (command.back() != '\n')
continue;
command.pop_back();
if (!command.empty())
if (int temp = parse_and_execute_command(command))
ret = temp;
command.clear();
}
if (!command.empty())
if (int temp = parse_and_execute_command(command))
ret = temp;
fclose(fp);
return ret;
}
bool exists(const BAN::String& path)
{
struct stat st;
return stat(path.data(), &st) == 0;
}
int source_shellrc()
{
if (char* home = getenv("HOME"))
{
BAN::String path(home);
MUST(path.append("/.shellrc"sv));
if (exists(path))
return source_script(path);
}
return 0;
}
int character_length(BAN::StringView prompt)
{
int length { 0 };
bool in_escape { false };
for (char c : prompt)
{
if (in_escape)
{
if (isalpha(c))
in_escape = false;
}
else
{
if (c == '\e')
in_escape = true;
else if (((uint8_t)c & 0xC0) != 0x80)
length++;
}
}
return length;
}
BAN::String get_prompt()
{
const char* raw_prompt = getenv("PS1");
if (raw_prompt == nullptr)
return "$ "sv;
BAN::String prompt;
for (int i = 0; raw_prompt[i]; i++)
{
char ch = raw_prompt[i];
if (ch == '\\')
{
switch (raw_prompt[++i])
{
case 'e':
MUST(prompt.push_back('\e'));
break;
case 'n':
MUST(prompt.push_back('\n'));
break;
case '\\':
MUST(prompt.push_back('\\'));
break;
case '~':
{
char buffer[256];
if (getcwd(buffer, sizeof(buffer)) == nullptr)
strcpy(buffer, strerrorname_np(errno));
const char* home = getenv("HOME");
size_t home_len = home ? strlen(home) : 0;
if (home && strncmp(buffer, home, home_len) == 0)
{
MUST(prompt.push_back('~'));
MUST(prompt.append(buffer + home_len));
}
else
{
MUST(prompt.append(buffer));
}
break;
}
case 'u':
{
static char* username = nullptr;
if (username == nullptr)
{
auto* passwd = getpwuid(geteuid());
if (passwd == nullptr)
break;
username = new char[strlen(passwd->pw_name) + 1];
strcpy(username, passwd->pw_name);
endpwent();
}
MUST(prompt.append(username));
break;
}
case 'h':
{
MUST(prompt.append(hostname));
break;
}
case '\0':
MUST(prompt.push_back('\\'));
break;
default:
MUST(prompt.push_back('\\'));
MUST(prompt.push_back(*raw_prompt));
break;
}
}
else
{
MUST(prompt.push_back(ch));
}
}
return prompt;
}
int prompt_length()
{
return character_length(get_prompt());
}
void print_prompt()
{
auto prompt = get_prompt();
fprintf(stdout, "%.*s", (int)prompt.size(), prompt.data());
fflush(stdout);
}
int main(int argc, char** argv)
{
argv0 = argv[0];
if (signal(SIGINT, [](int) {}) == SIG_ERR)
perror("signal");
tcgetattr(0, &old_termios);
{
FILE* fp = fopen("/etc/hostname", "r");
if (fp != NULL)
{
char buffer[512];
while (size_t nbyte = fread(buffer, 1, sizeof(buffer), fp))
{
if (nbyte == 0)
break;
MUST(hostname.append(BAN::StringView(buffer, nbyte)));
}
fclose(fp);
}
if (!hostname.empty() && hostname.back() == '\n')
hostname.pop_back();
}
if (argc >= 2)
{
if (strcmp(argv[1], "-c") == 0)
{
if (argc == 2)
{
printf("-c requires an argument\n");
return 1;
}
BAN::String command;
MUST(command.append(argv[2]));
auto commands = parse_command(command);
return execute_piped_commands(commands);
}
printf("unknown argument '%s'\n", argv[1]);
return 1;
}
if (argc >= 1)
setenv("SHELL", argv[0], true);
source_shellrc();
new_termios = old_termios;
new_termios.c_lflag &= ~(ECHO | ICANON);
tcsetattr(0, TCSANOW, &new_termios);
BAN::Vector<BAN::String> buffers, history;
MUST(buffers.emplace_back(""sv));
size_t index = 0;
size_t col = 0;
int waiting_utf8 = 0;
print_prompt();
while (true)
{
int chi = getchar();
if (chi == EOF)
{
if (errno == EINTR)
{
clearerr(stdin);
continue;
}
perror("getchar");
return 1;
}
uint8_t ch = chi;
if (waiting_utf8 > 0)
{
waiting_utf8--;
ASSERT((ch & 0xC0) == 0x80);
fputc(ch, stdout);
MUST(buffers[index].insert(ch, col++));
if (waiting_utf8 == 0)
{
fprintf(stdout, "\e[s%s\e[u", buffers[index].data() + col);
fflush(stdout);
}
continue;
}
else if (ch & 0x80)
{
if ((ch & 0xE0) == 0xC0)
waiting_utf8 = 1;
else if ((ch & 0xF0) == 0xE0)
waiting_utf8 = 2;
else if ((ch & 0xF8) == 0xF0)
waiting_utf8 = 3;
else
ASSERT_NOT_REACHED();
fputc(ch, stdout);
MUST(buffers[index].insert(ch, col++));
continue;
}
switch (ch)
{
case '\e':
ch = getchar();
if (ch != '[')
break;
ch = getchar();
switch (ch)
{
case 'A': if (index > 0) { index--; col = buffers[index].size(); fprintf(stdout, "\e[%dG%s\e[K", prompt_length() + 1, buffers[index].data()); fflush(stdout); } break;
case 'B': if (index < buffers.size() - 1) { index++; col = buffers[index].size(); fprintf(stdout, "\e[%dG%s\e[K", prompt_length() + 1, buffers[index].data()); fflush(stdout); } break;
case 'C': if (col < buffers[index].size()) { col++; while ((buffers[index][col - 1] & 0xC0) == 0x80) col++; fprintf(stdout, "\e[C"); fflush(stdout); } break;
case 'D': if (col > 0) { while ((buffers[index][col - 1] & 0xC0) == 0x80) col--; col--; fprintf(stdout, "\e[D"); fflush(stdout); } break;
}
break;
case '\x0C': // ^L
{
int x = prompt_length() + character_length(buffers[index].sv().substring(col)) + 1;
fprintf(stdout, "\e[H\e[J");
print_prompt();
fprintf(stdout, "%s\e[u\e[1;%dH", buffers[index].data(), x);
fflush(stdout);
break;
}
case '\b':
if (col > 0)
{
while ((buffers[index][col - 1] & 0xC0) == 0x80)
buffers[index].remove(--col);
buffers[index].remove(--col);
fprintf(stdout, "\b\e[s%s \e[u", buffers[index].data() + col);
fflush(stdout);
}
break;
case '\x01': // ^A
col = 0;
fprintf(stdout, "\e[%dG", prompt_length() + 1);
fflush(stdout);
break;
case '\x03': // ^C
fputc('\n', stdout);
print_prompt();
buffers[index].clear();
col = 0;
break;
case '\x04': // ^D
fprintf(stdout, "\n");
clean_exit();
break;
case '\n':
fputc('\n', stdout);
if (!buffers[index].empty())
{
last_return = parse_and_execute_command(buffers[index]);
MUST(history.push_back(buffers[index]));
buffers = history;
MUST(buffers.emplace_back(""sv));
}
print_prompt();
index = buffers.size() - 1;
col = 0;
break;
case '\t':
// FIXME: Implement tab completion or something
break;
default:
MUST(buffers[index].insert(ch, col++));
if (col == buffers[index].size())
fputc(ch, stdout);
else
fprintf(stdout, "%c\e[s%s\e[u", ch, buffers[index].data() + col);
fflush(stdout);
break;
}
}
clean_exit();
}
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