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main.cpp
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main.cpp
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static bool s_running = false;
static bool s_verbose = false;
static bool s_veryVerbose = false;
static bool s_dryRun = false;
#include "udevconnection.h"
#include "utils.h"
#include "keys.h"
#include <iostream>
#include <sstream>
#include <fstream>
#include <filesystem>
extern "C" {
#include <linux/input.h>
#include <sys/stat.h>
#include <sys/resource.h>
#include <fcntl.h>
#include <unistd.h>
#include <wordexp.h>
#include <signal.h>
#include <termios.h>
}
static bool s_pressedKeys[KEY_CNT];
static bool s_usedKeys[KEY_CNT];
struct File
{
File (const std::string &filename, bool keyboard, const int flags = O_RDONLY | O_NONBLOCK | O_CLOEXEC) : m_filename(filename) {
fd = open(filename.c_str(), flags);
if (fd == -1) {
perror(("Failed to open " + filename).c_str());
return;
}
if (keyboard) {
long bits[KEY_CNT] = { 0 };
int ret = ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(bits)), bits);
if (ret < 0) {
perror(("Failed to get key bits from " + filename).c_str());
close(fd);
fd = -1;
return;
}
}
if (s_verbose) printf("Opened %s\n", m_filename.c_str());
}
~File() {
if (fd != -1) {
// Closing is very slow, for some reason, so print progress
std::cout << "Closing " << fd << std::flush;
close(fd);
if (s_verbose) {
puts("");
} else {
std::cout << "\033[2K\r";
}
}
}
File(File&& other) : m_filename(std::move(other.m_filename)) {
fd = other.fd;
other.fd = -1;
}
File &operator=(File &&other) {
m_filename = std::move(other.m_filename);
fd = other.fd;
other.fd = -1;
return *this;
}
void unlink() {
if (unlinkat(fd, m_filename.c_str(), 0) == -1) {
perror(("Failed to unlink " + m_filename).c_str());
}
}
File(const File &) = delete;
File &operator=(const File &) = delete;
bool isOpen() { return fd != -1; }
int fd = -1;
const std::string &filename() const { return m_filename; }
private:
std::string m_filename;
};
static void resetPressedKeys()
{
memset(s_pressedKeys, 0, KEY_CNT * sizeof(bool));
}
static bool handleKey(const int fd)
{
while (true) {
input_event iev;
int ret = read(fd, &iev, sizeof(iev));
if (ret != sizeof(iev)) {
if (errno == EAGAIN) {
return true;
}
if (errno != ENODEV || s_verbose) perror("Short read");
return false;
}
if (iev.type == EV_SYN && iev.code == SYN_DROPPED) {
fprintf(stderr, "Got dropped events!");
return false;
}
if (iev.type != EV_KEY) {
if (s_verbose) printf("Wrong event type %d (%d: %d) ", iev.type, iev.code, iev.value);
// Why doesn't it work when I try continue instead here? I feel dumb
return true;
}
if (s_veryVerbose) printf("Correct event type %d (%d: %d) ", iev.type, iev.code, iev.value);
if (iev.code >= KEY_CNT) {
printf("Invalid key %d\n", iev.code);
return false;
}
s_pressedKeys[iev.code] = iev.value;
if (s_verbose) printf("key %s has state %d\n", getKeyName(iev.code).c_str(), iev.value);
}
return true;
}
struct Shortcut {
std::vector<uint16_t> keys;
std::string command;
bool active = false;
bool isValid() const { return !keys.empty() && !command.empty(); }
};
std::vector<File> openKeyboards(const std::unordered_map<std::string, std::string> &keyboards)
{
std::vector<File> files;
for (const std::pair<const std::string, std::string> &keyboard : keyboards) {
if (s_verbose) std::cout << keyboard.first << ": " << keyboard.second << std::endl;
File file(keyboard.second, true);
if (!file.isOpen()) {
continue;
}
files.push_back(std::move(file));
}
return files;
}
static std::string getConfigPath()
{
std::string path;
char *rawPath = getenv("XDG_CONFIG_HOME");
if (rawPath) {
path = std::string(rawPath);
}
if (path.empty()) {
rawPath = getenv("HOME");
if (rawPath) {
path = getenv("HOME");
path += "/.config";
}
} else if (path.find(':') != std::string::npos) {
std::istringstream stream(path);
std::string testPath;
while (std::getline(stream, testPath, ':')) {
testPath = resolvePath(testPath);
if (!std::filesystem::exists(testPath)) {
continue;
}
if (!std::filesystem::is_directory(testPath)) {
continue;
}
path = testPath;
break;
}
}
path += "/shortcut-satan.conf";
return resolvePath(path);
}
static Shortcut parseShortcut(const std::string &line)
{
if (line.empty()) {
return {};
}
if (line[0] == '#') {
return {};
}
std::string name;
std::string value;
size_t splitPos = line.find(':');
if (splitPos == std::string::npos) {
puts(("Invalid line " + line).c_str());
return {};
}
Shortcut shortcut;
shortcut.command = std_sux::trim(line.substr(splitPos + 1));
if (shortcut.command.empty()) {
puts(("Missing command: " + line).c_str());
return {};
}
const std::string keys = std_sux::trim(line.substr(0, splitPos));
if (keys.empty()) {
puts(("Missing keys: " + line).c_str());
return {};
}
std::istringstream stream(keys);
std::string keyString;
while (std::getline(stream, keyString, ' ')) {
const int keyCode = getKeyCode(std_sux::trim(keyString));
if (keyCode == -1) {
puts(("Invalid key " + keyString).c_str());
return {};
}
shortcut.keys.push_back(keyCode);
s_usedKeys[keyCode] = true;
}
return shortcut;
}
std::vector<Shortcut> parseConfig(const std::string &path)
{
if (!std::filesystem::exists(path)) {
puts((path + " does not exist").c_str());
return {};
}
std::ifstream file(path);
if (!file.is_open()) {
perror(("Failed to open config file" + path).c_str());
return {};
}
std::vector<Shortcut> ret;
std::string line;
while (std::getline(file, line)) {
Shortcut shortcut = parseShortcut(std_sux::trim(line));
if (!shortcut.isValid()) {
continue;
}
ret.push_back(shortcut);
}
return ret;
}
void signalHandler(int sig)
{
signal(sig, SIG_DFL);
s_running = false;
}
int main(int argc, char *argv[])
{
bool printKeys = false;
for (int i=1; i<argc; i++) {
const std::string arg(argv[i]);
if (arg == "-p" || arg == "--printkeys") {
printKeys = true;
continue;
}
if (arg == "-v" || arg == "--verbose") {
s_verbose = true;
continue;
}
if (arg == "-vv" || arg == "--very-verbose") {
s_verbose = true;
continue;
}
if (arg == "--list-keys") {
puts("Available keys:");
for (const std::pair<const std::string, uint16_t> &key : key_conversion_table) {
printf(" %s\n", key.first.c_str());
}
exit(0);
}
printf("Usage: %s [--verbose|-v|-vv|--very-verbose|--list-keys|-p|--printkeys]\n", argv[0]);
exit(EINVAL);
}
File pidfile("/tmp/shortcut-satan.lock", false, O_WRONLY | O_CREAT | O_CREAT);
if (!pidfile.isOpen() || lockf(pidfile.fd, F_TLOCK, 0) == -1) {
if (errno == EAGAIN || errno == EACCES) {
puts("Already running");
} else {
perror("Failed to create lock file");
}
return EALREADY; // lol sue me
}
termios origTermios;
tcgetattr(STDIN_FILENO, &origTermios);
if (printKeys) {
termios newTermios = origTermios;
newTermios.c_lflag &= ~ECHO;
tcsetattr(STDIN_FILENO, TCSANOW, &newTermios);
}
signal(SIGINT, &signalHandler);
signal(SIGTERM, &signalHandler);
signal(SIGQUIT, &signalHandler);
signal(SIGHUP, SIG_IGN);
signal(SIGCHLD, SIG_IGN);
UdevConnection udevConnection;
const std::string configPath = getConfigPath();
std::vector<Shortcut> shortcuts = parseConfig(configPath);
for (const Shortcut &s : shortcuts) {
for (const uint16_t k : s.keys) {
if (s_verbose) printf("Keycode: %d\n", k);
}
}
if (shortcuts.empty()) {
puts(("Failed to load " + configPath).c_str());
return ENOENT;
}
std::vector<File> files = openKeyboards(udevConnection.keyboardPaths);
if (files.empty()) {
fprintf(stderr, "Failed to open any keyboards\n");
return ENODEV;
}
s_running = true;
bool anyActiveShortcuts = false;
puts("Running");
fd_set fdset;
while (s_running) {
FD_ZERO(&fdset);
int maxFd = 3;
for (const File &file : files) {
FD_SET(file.fd, &fdset);
maxFd = std::max(maxFd, file.fd);
}
FD_SET(udevConnection.udevSocketFd, &fdset);
maxFd = std::max(maxFd, udevConnection.udevSocketFd);
timeval timeout;
timeout.tv_sec = 30;
timeout.tv_usec = 0;
const int events = select(maxFd + 1, &fdset, 0, 0, &timeout);
if (events == -1) {
if (s_running) {
perror("Failed during select");
}
break;
}
if (events == 0) {
// If there was a timeout, assume we might have missed some events and reset state
resetPressedKeys();
continue;
}
if (s_verbose) printf("Handling %d events\n", events);
bool updated = false;
bool needReload = false;
for (std::vector<File>::iterator it = files.begin(); it != files.end();) {
if (!FD_ISSET(it->fd, &fdset)) {
it++;
continue;
}
updated = true;
if (s_verbose) printf("%s got updated\n", it->filename().c_str());
bool removed = false;
if (!handleKey(it->fd)) {
if (errno == ENODEV) {
removed = true;
if (s_verbose) printf("\n%s gone, removing", it->filename().c_str());
}
if (s_verbose) puts("\nUnable to handle key, resetting state");
// Reset pressed keys in case of an error
resetPressedKeys();
}
if (s_verbose) puts("");
if (removed) {
it = files.erase(it);
} else {
it++;
}
}
// Tiny performance improvement, if the key isn't used in any shortcut
// don't loop through all shortcuts
bool needToCheckShortcuts = anyActiveShortcuts;// In case there are active shortcuts they need to be updated in case they are inactive
if (!anyActiveShortcuts && updated) {
for (size_t i = 0; i<KEY_CNT; i++) {
if (!s_usedKeys[i]) {
continue;
}
if (!s_pressedKeys[i]) {
continue;
}
needToCheckShortcuts = true;
break;
}
}
if (s_veryVerbose) {
if (anyActiveShortcuts) {
puts("Has active shortcuts");
} else {
puts("No active shortcuts");
}
if (!needToCheckShortcuts) {
puts("Interesting keys pressed");
} else {
puts("No interesting keys pressed");
}
}
if (needToCheckShortcuts) {
if (s_veryVerbose) puts("Checking shortcuts");
anyActiveShortcuts = false;
for (Shortcut &shortcut : shortcuts) {
bool activated = true;
for (const uint16_t code : shortcut.keys) {
if (!s_pressedKeys[code]) {
if (s_veryVerbose) printf("%d missing\n", code);
activated = false;
break;
}
}
if (!activated) {
shortcut.active = false;
continue;
}
if (shortcut.active) {
anyActiveShortcuts = true;
continue;
}
shortcut.active = true;
anyActiveShortcuts = true;
if (s_verbose) printf("Activated '%s'\n", shortcut.command.c_str());
launch(shortcut.command);
}
if (printKeys) {
printf("\033[2K\r");
for (int i=0; i<KEY_CNT; i++) {
if (s_pressedKeys[i]) {
printf("'%s' ", getKeyName(i).c_str());
}
}
fflush(stdout);
}
}
if (FD_ISSET(udevConnection.udevSocketFd, &fdset)) {
std::string updatedPath;
const UdevConnection::UpdateResult result = udevConnection.update(&updatedPath);
switch(result) {
case UdevConnection::KeyboardAdded: {
File file(updatedPath, true);
if (!file.isOpen()) {
break;
}
if (s_verbose) printf("%s added\n", updatedPath.c_str());
files.push_back(std::move(file));
break;
}
case UdevConnection::KeyboardRemoved:
for (std::vector<File>::iterator it = files.begin(); it != files.end(); it++) {
if (it->filename() == updatedPath) {
if (s_verbose) printf("%s removed, removing\n", it->filename().c_str());
// Assume there's just one? Neh.
it = files.erase(it);
break;
}
}
break;
case UdevConnection::NoUpdate:
default:
break;
}
needReload = true;
}
if (needReload) {
// Reset pressed keys if the keyboard numbers etc. change
resetPressedKeys();
}
}
puts("\nGoodbye");
pidfile.unlink();
if (printKeys) {
tcsetattr(STDIN_FILENO, TCSANOW, &origTermios);
}
return 0;
}