banan-os/userspace/Shell/main.cpp

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#include <BAN/ScopeGuard.h>
#include <BAN/String.h>
#include <BAN/Vector.h>
#include <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
#include <sys/stat.h>
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#include <termios.h>
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#include <unistd.h>
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struct termios old_termios, new_termios;
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BAN::Vector<char*> parse_command(BAN::StringView command)
{
auto args = MUST(command.split(' '));
BAN::Vector<char*> result;
for (auto arg : args)
{
char* carg = new char[arg.size() + 1];
memcpy(carg, arg.data(), arg.size());
carg[arg.size()] = '\0';
MUST(result.push_back(carg));
}
return result;
}
int execute_command(BAN::StringView command)
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{
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auto args = parse_command(command);
if (args.empty())
return 0;
BAN::ScopeGuard deleter([&args] {
for (char* arg : args)
delete[] arg;
});
if (args.front() == "clear"sv)
{
fprintf(stdout, "\e[H\e[J");
fflush(stdout);
return 0;
}
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else if (args.front() == "exit"sv)
{
exit(0);
}
else if (args.front() == "export"sv)
{
bool first = false;
for (const char* arg : args)
{
if (first)
{
first = false;
continue;
}
const char* eq_sign = strchr(arg, '=');
if (eq_sign == nullptr)
continue;
char name[128];
if (eq_sign - arg >= sizeof(name))
continue;
memcpy(name, arg, eq_sign - arg);
name[eq_sign - arg] = '\0';
char value[128];
strncpy(value, eq_sign + 1, sizeof(value));
setenv(name, value, true);
}
}
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else
{
pid_t pid = fork();
if (pid == 0)
{
MUST(args.push_back(nullptr));
execv(args.front(), args.data());
perror("execv");
exit(1);
}
if (pid == -1)
{
perror("fork");
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return 1;
}
int status;
if (waitpid(pid, &status, 0) == -1)
perror("waitpid");
}
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return 0;
}
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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;
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else if (((uint8_t)c & 0xC0) != 0x80)
length++;
}
}
return length;
}
BAN::String get_prompt()
{
const char* raw_prompt = getenv("PS1");
if (raw_prompt == nullptr)
raw_prompt = "\e[32muser@host\e[m:\e[34m/\e[m$ ";
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 '\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", prompt.size(), prompt.data());
fflush(stdout);
}
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int main(int argc, char** argv)
{
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tcgetattr(0, &old_termios);
new_termios = old_termios;
new_termios.c_lflag &= ~(ECHO | ICANON);
tcsetattr(0, TCSANOW, &new_termios);
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BAN::Vector<BAN::String> buffers, history;
MUST(buffers.emplace_back(""sv));
size_t index = 0;
size_t col = 0;
int waiting_utf8 = 0;
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print_prompt();
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while (true)
{
uint8_t ch;
fread(&ch, 1, sizeof(char), stdin);
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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)
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{
case '\e':
fread(&ch, 1, sizeof(char), stdin);
if (ch != '[')
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break;
fread(&ch, 1, sizeof(char), stdin);
switch (ch)
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{
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;
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}
break;
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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);
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fflush(stdout);
break;
}
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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);
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}
break;
case '\n':
fputc('\n', stdout);
if (!buffers[index].empty())
{
tcsetattr(0, TCSANOW, &old_termios);
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execute_command(buffers[index]);
tcsetattr(0, TCSANOW, &new_termios);
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MUST(history.push_back(buffers[index]));
buffers = history;
MUST(buffers.emplace_back(""sv));
}
print_prompt();
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index = buffers.size() - 1;
col = 0;
break;
default:
MUST(buffers[index].insert(ch, col++));
fprintf(stdout, "%c\e[s%s\e[u", ch, buffers[index].data() + col);
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fflush(stdout);
break;
}
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}
tcsetattr(0, TCSANOW, &old_termios);
return 0;
}