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keyboard.cxx
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keyboard.cxx
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// Created by moisrex on 9/9/22.
module;
#include <algorithm>
#include <cstdio>
#include <linux/input.h>
#include <ranges>
#include <spdlog/spdlog.h>
#include <thread>
module foresight.keyboard;
keyboard::keyboard() {
setbuf(stdin, nullptr);
setbuf(stdout, nullptr);
}
void keyboard::to_string() {
str.reserve(events.size());
for ([[maybe_unused]] auto const &[time, type, code, value] : events) {
char const cur = to_char(code);
str.push_back(cur);
}
}
void keyboard::replace(std::string_view const replace_it, std::string_view const replace_with) {
backspace(replace_it.size());
put(replace_with);
events.clear();
}
void keyboard::backspace(std::size_t count) {
for (; count != 0; count--) {
put(input_event{.type = EV_KEY, .code = KEY_BACKSPACE});
}
}
void keyboard::put(std::string_view const text) {
for (auto const cur_char : text) {
put(input_event{.type = EV_KEY, // key type
.code = static_cast<std::uint8_t>(cur_char), // code
.value = KEY_PRESS});
}
}
void keyboard::put(input_event event) {
event.value = KEY_PRESS;
if (auto const press_res = std::fwrite(&event, sizeof(event), 1, stdout); press_res == 0) {
spdlog::error("Failed to press {:d}", event.code);
return;
}
event.value = KEY_RELEASE;
if (auto const release_res = fwrite(&event, sizeof(event), 1, stdout); release_res == 0) {
// todo: Oh, SH*T, should we put this in a retry loop until release?
spdlog::error("Failed to release {:d}", event.code);
}
}
void keyboard::buffer(input_event &event) {
switch (event.value) {
case KEY_PRESS: {
break;
}
case KEY_RELEASE: {
return;
}
case KEY_KEEPING_PRESSED: {
return;
}
default: return;
}
if (events.size() > 500) {
events.clear();
}
events.push_back(event);
}
// true: try again
// false: give up
bool handle_errors() {
static std::size_t tries = 1;
++tries;
if (tries == give_up_limit + 1) {
spdlog::critical(
"Tried {0:d} times and failed everytime to start the loop (or in the loop); giving up!",
tries);
return false;
}
return true;
}
int keyboard::loop() noexcept {
try {
while (std::fread(&event, sizeof(event), 1, stdin) == 1) {
if (event.type == EV_KEY) {
buffer(event);
// check();
}
if (auto const out_res = std::fwrite(&event, sizeof(event), 1, stdout); out_res == 0) {
spdlog::error("Can't send {}.", event.code);
}
}
} catch (std::exception const &ex) {
spdlog::error("Error: \"{0:s}\" at the main loop.", ex.what());
if (handle_errors()) {
return loop();
}
return 1;
} catch (...) {
spdlog::error(
"Unknown error occurred. Try reporting this at https://github.com/the-moisrex/foresight.");
if (handle_errors()) {
return loop();
}
return 1;
}
return 0;
}