176 lines
3.3 KiB
C++
176 lines
3.3 KiB
C++
#include <BAN/ScopeGuard.h>
|
|
#include <BAN/String.h>
|
|
#include <BAN/Vector.h>
|
|
#include <ctype.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <sys/stat.h>
|
|
#include <termios.h>
|
|
#include <unistd.h>
|
|
|
|
struct termios old_termios, new_termios;
|
|
|
|
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)
|
|
{
|
|
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;
|
|
}
|
|
else
|
|
{
|
|
struct stat stat_buf;
|
|
if (stat(args.front(), &stat_buf) == -1)
|
|
{
|
|
fprintf(stderr, "command not found: %s\n", args.front());
|
|
return 1;
|
|
}
|
|
|
|
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()");
|
|
return 1;
|
|
}
|
|
int status;
|
|
if (waitpid(pid, &status, 0) == -1)
|
|
perror("waitpid");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int prompt_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
|
|
length++;
|
|
}
|
|
}
|
|
return length;
|
|
}
|
|
|
|
int main(int argc, char** argv)
|
|
{
|
|
tcgetattr(0, &old_termios);
|
|
|
|
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;
|
|
|
|
bool got_csi = false;
|
|
|
|
BAN::String prompt("\e[32muser@host\e[m:\e[34m/\e[m$ "sv);
|
|
fprintf(stdout, "%s", prompt.data());
|
|
fflush(stdout);
|
|
|
|
while (true)
|
|
{
|
|
char c;
|
|
fread(&c, 1, sizeof(char), stdin);
|
|
|
|
if (got_csi)
|
|
{
|
|
|
|
continue;
|
|
}
|
|
|
|
switch (c)
|
|
{
|
|
case '\e':
|
|
fread(&c, 1, sizeof(char), stdin);
|
|
if (c != '[')
|
|
break;
|
|
fread(&c, 1, sizeof(char), stdin);
|
|
switch (c)
|
|
{
|
|
case 'A': if (index > 0) { index--; col = buffers[index].size(); fprintf(stdout, "\e[%dG%s\e[K", prompt_length(prompt) + 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(prompt) + 1, buffers[index].data()); fflush(stdout); } break;
|
|
case 'C': break;
|
|
case 'D': break;
|
|
}
|
|
break;
|
|
case '\b':
|
|
if (col > 0)
|
|
{
|
|
buffers[index].pop_back();
|
|
fprintf(stdout, "\b \b");
|
|
fflush(stdout);
|
|
col--;
|
|
}
|
|
break;
|
|
case '\n':
|
|
fputc('\n', stdout);
|
|
if (!buffers[index].empty())
|
|
{
|
|
execute_command(buffers[index]);
|
|
MUST(history.push_back(buffers[index]));
|
|
buffers = history;
|
|
MUST(buffers.emplace_back(""sv));
|
|
}
|
|
fprintf(stdout, "%s", prompt.data());
|
|
fflush(stdout);
|
|
index = buffers.size() - 1;
|
|
col = 0;
|
|
break;
|
|
default:
|
|
MUST(buffers[index].push_back(c));
|
|
fprintf(stdout, "%s \b", buffers[index].data() + col);
|
|
fflush(stdout);
|
|
col++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
tcsetattr(0, TCSANOW, &old_termios);
|
|
return 0;
|
|
}
|