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First steps of implementing command-line processing in the ascii driver.

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This commit is contained in:
jyelon
2025-12-18 19:42:05 -05:00
parent 3dd6894305
commit 2646e4d4ac
3 changed files with 71 additions and 34 deletions
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55
luprex/cpp/drv/driver.cpp
View File

@@ -16,6 +16,9 @@ static void if_error_print_and_exit(const std::string_view str) {
}
}
// DPrints are currently not going through the readline device.
// doing so would not currently be thread-safe. Do I care about
// that? I'm not sure.
static void dprint_callback(const char *oneline, size_t size) {
fwrite("**", 1, 2, stderr);
fwrite(oneline, 1, size, stderr);
@@ -91,6 +94,7 @@ class Driver {
std::unique_ptr<struct pollfd[]> pollvec_;
std::unique_ptr<char[]> chbuf_;
ReadlineDevice readline_device_;
std::string console_command_;
sslutil::UniqueCTX ssl_server_ctx_;
sslutil::UniqueCTX ssl_client_secure_ctx_;
@@ -197,34 +201,58 @@ class Driver {
}
}
void handle_console_output() {
void channel_printbuffer() {
if (engw.get_have_prints(&engw)) {
uint32_t ndata;
const char *data;
engw.play_access(&engw, AccessKind::CHANNEL_PRINTS, 0, 0, "", &ndata, &data);
if (ndata > 0) {
if (ndata > DRV_SHORTSTRING_SIZE) ndata = DRV_SHORTSTRING_SIZE;
std::string_view src(data, ndata);
int consumed;
std::u32string cps = drvutil::utf8_to_utf32(src, &consumed);
readline_device_.print(cps);
readline_device_.printline(std::string_view(data, ndata));
}
}
}
void add_console_command(std::string_view addition)
{
std::string cmd = console_command_ + std::string(addition);
console_command_.clear();
uint32_t ndata;
const char *data;
engw.play_access(&engw, AccessKind::VALIDATE_LUA_EXPR,
0, cmd.size(), cmd.c_str(), &ndata, &data);
std::string_view message(data, ndata);
// Handle the command.
if (message == "truncated lua") {
console_command_ = cmd;
} else if (message == "white space") {
readline_device_.printline("white space.");
} else if (message == "slash command") {
readline_device_.printline("slash command.");
} else if (message.empty()) {
readline_device_.printline("valid lua");
} else {
readline_device_.printline(message);
}
if (console_command_.empty()) {
readline_device_.set_prompt(">");
} else {
readline_device_.set_prompt(">>");
}
}
void handle_console_input() {
read_console_recently_ = false;
std::u32string prompt = drvutil::utf8_to_utf32(">", nullptr);
readline_device_.set_prompt(prompt);
while (true) {
std::u32string cps = console_read();
if (cps.size() == 0) break;
read_console_recently_ = true;
for (char32_t c : cps) {
std::u32string line = readline_device_.putcode(c);
std::string line = readline_device_.putcode(c);
if (!line.empty()) {
std::string utf8 = drvutil::utf32_to_utf8(line);
engw.play_recv_incoming(&engw, 0, utf8.size(), utf8.c_str());
add_console_command(line);
}
}
}
@@ -588,7 +616,9 @@ class Driver {
int drive(int argc, char *argv[]) {
// Set up the console readline device.
readline_device_.set_print_callback(console_write);
readline_device_.set_prompt(">");
console_command_.clear();
// Remove the program name from argv.
std::string program = argv[0];
argc -= 1;
@@ -659,12 +689,11 @@ class Driver {
// Main loop.
while (!engw.get_stop_driver(&engw)) {
handle_lua_source();
handle_console_output();
handle_new_outgoing_sockets();
handle_socket_input_output();
handle_console_input();
engw.play_update(&engw, drvutil::get_monotonic_clock());
handle_console_output();
channel_printbuffer();
}
// Cleanup

40
luprex/cpp/drv/readline.cpp
View File

@@ -2,6 +2,10 @@
#define MAXLINE 512
static std::u32string white_(1, ' ');
static std::u32string newline_(1, '\n');
static std::u32string n_backspaces(int n) {
std::u32string result(3 * n, 0);
for (int i = 0; i < n; i++) {
@@ -24,8 +28,8 @@ void ReadlineDevice::set_print_callback(print_callback cb) {
print_cb_ = cb;
}
void ReadlineDevice::set_prompt(const std::u32string &prompt) {
desired_prompt_ = prompt;
void ReadlineDevice::set_prompt(std::string_view prompt) {
desired_prompt_ = drvutil::utf8_to_utf32(prompt, nullptr);
echo_command();
}
@@ -66,46 +70,46 @@ void ReadlineDevice::echo_command() {
}
}
std::u32string ReadlineDevice::putcode(char32_t c) {
std::string ReadlineDevice::putcode(char32_t c) {
if ((c == '\n') && (readline_lastc_ == '\r')) {
// Ignore newline immediately after carriage return.
// Otherwise, crlf produces two newlines.
return std::u32string();
return "";
} else if ((c == '\r') || (c == '\n')) {
std::u32string white(1, ' ');
std::u32string newline(1, '\n');
echo_command();
print_cb_(white + newline);
std::u32string result = desired_command_ + newline;
print_cb_(white_ + newline_);
std::u32string result = desired_command_ + newline_;
desired_command_.clear();
current_prompt_.clear();
current_command_.clear();
echo_command();
return result;
return drvutil::utf32_to_utf8(result);
} else if ((c == '\b') || (c == 127)) {
int len = desired_command_.size();
if (len > 0) {
desired_command_ = desired_command_.substr(0, len-1);
}
echo_command();
return std::u32string();
return "";
} else if ((c >= 32)&&(c <= 0x10FFFF)) {
int len = desired_command_.size();
if (len < MAXLINE) {
desired_command_ = desired_command_ + c;
}
echo_command();
return std::u32string();
return "";
}
readline_lastc_ = c;
return std::u32string();
return "";
}
void ReadlineDevice::print(const std::u32string &s) {
if (!s.empty()) {
erase_command();
print_cb_(s);
echo_command();
}
void ReadlineDevice::printline(std::string_view s) {
bool missing_newline = ((s.size() == 0) || (s[s.size() - 1] != '\n'));
std::u32string utf32 = drvutil::utf8_to_utf32(s, nullptr);
erase_command();
print_cb_(utf32);
if (missing_newline) print_cb_(newline_);
echo_command();
}

10
luprex/cpp/drv/readline.hpp
View File

@@ -28,15 +28,19 @@ public:
void set_print_callback(print_callback cb);
// change the prompt.
void set_prompt(const std::u32string &prompt);
void set_prompt(std::string_view prompt);
// Use this to print anything on the console.
void print(const std::u32string &cps);
//
// if the string doesn't end in a newline, one will
// be automatically added.
//
void printline(std::string_view cps);
// Whenever the user types a character, call 'putcode'. If the code is
// newline, this returns the line of text that was entered, including the
// newline. Otherwise returns empty string. Backspace is handled here.
std::u32string putcode(char32_t codepoint);
std::string putcode(char32_t codepoint);
};