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#include <iostream>
#include <vector>
#include <string>
#include <optional>
#include <utility>
#include <cstring>
#include "xutil.h"
#include "keysym_table.h"
namespace {
void usage(const char *argv0) {
std::cerr
<< "Usage:\n"
<< " " << argv0 << " --which\n"
<< " " << argv0 << " <key>\n"
<< " " << argv0 << " [<key> <output> | s:<keysym> <output> | c:<keycode> <output>]*\n"
<< "\n"
<< "Keys are specified with the X11 keysym name, its keysym ID (prefixed with 's:'),\n"
<< "or its keycode (prefixed with 'c:'). The keycode is typically non-portable\n"
<< "because it depends on the particular keyboard hardware.\n"
<< "xev(1) prints the keysym name and the keysym ID (in hexadecimal).\n"
<< "Keysym IDs and keycodes can be given in decimal and in hexadecimal (with 0x).\n"
<< "Examples:\n"
<< "- KP_1 and s:0xffb1 are valid key values for the '1' key on the numpad.\n"
<< "- XF86Launch7 and s:0x1008ff47 are valid key values for F16 on an Apple keyboard.\n"
<< "The values can also be found in /usr/include/xkbcommon/xkbcommon-keysyms.h .\n"
<< "\n"
<< "If a single key is given, the program grabs that key and exits when the key is\n"
<< "pressed. If multiple keys are given, the output string corresponding to the\n"
<< "pressed key will be printed before exiting.\n"
<< "\n"
<< "In --which mode, the program will grab the entire keyboard, wait until the first\n"
<< "pressed key, and print its keycode for use with 'c:'.\n"
;
}
std::vector<std::pair<x::Keycode, std::string>> parse_watchlist(Display *dpy, int argc, char **argv) {
std::vector<std::pair<x::Keycode, std::string>> watchlist;
if (argc <= 1) {
usage(argv[0]);
exit(1);
}
for (int i = 1; i < argc; i++) {
if (strcmp(argv[i], "--help") == 0 || strcmp(argv[i], "-h") == 0) {
usage(argv[0]);
exit(0);
}
std::optional<x::Keycode> mcode;
if ((argv[i][0] == 's' || argv[i][0] == 'c') && argv[i][1] == ':') {
unsigned number;
if (argv[i][2] == '0' && argv[i][3] == 'x') {
char *endp;
number = strtol(argv[i] + 2, &endp, 16);
if (argv[i][2] == '\0' || *endp != '\0') {
std::cerr << "Invalid hexadecimal number in '" << argv[i] << "'\n";
exit(1);
}
} else {
char *endp;
number = strtol(argv[i] + 2, &endp, 10);
if (argv[i][2] == '\0' || *endp != '\0') {
std::cerr << "Invalid decimal number in '" << argv[i] << "'\n";
exit(1);
}
}
if (argv[i][0] == 's') mcode = x::Keysym{number}.toCode(dpy);
else mcode = x::Keycode{number};
}
if (!mcode) {
for (size_t j = 0; j < keysym_table.size(); j++) {
if (strcmp(argv[i], keysym_table[j].first) == 0) {
mcode = keysym_table[j].second.toCode(dpy);
break;
}
}
}
if (!mcode) {
std::cerr << "Unknown key name '" << argv[i] << "'\n";
exit(1);
}
std::string output;
if (i == 1 && argc == 2) {
// empty output
} else if (i >= argc - 1) {
std::cerr << "Missing output for key '" << argv[i] << "'\n";
exit(1);
} else {
output = argv[i+1];
i++; // skip output
}
watchlist.emplace_back(*mcode, std::move(output));
}
return watchlist;
}
}
int main(int argc, char **argv) {
auto dpypair = x::XOpenDisplayRAII(nullptr);
Display *dpy = dpypair.first;
if (argc >= 2 && strcmp(argv[1], "--which") == 0) {
x::globalKeyboardGrab(dpy, [](const XKeyEvent &ev) -> bool {
std::cout << "c:" << ev.keycode << std::endl;
return true;
});
return 0;
}
std::vector<std::pair<x::Keycode, std::string>> watchlist = parse_watchlist(dpy, argc, argv);
Window root = DefaultRootWindow(dpy);
std::vector<x::UponExit<std::function<void()>>> cleaners;
cleaners.reserve(watchlist.size());
for (const auto &p : watchlist) {
cleaners.push_back(x::XGrabKeyRAII(dpy, p.first, AnyModifier, root));
}
XSelectInput(dpy, root, KeyPressMask);
while (true) {
XEvent ev;
XNextEvent(dpy, &ev);
if (ev.type != KeyPress) continue;
for (const auto &p : watchlist) {
if (ev.xkey.keycode == (unsigned int)p.first) {
if (p.second.size() > 0) std::cout << p.second << std::endl;
return 0;
}
}
}
}
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