Initial commit
This commit is contained in:
Miles Alan
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#include <errno.h>
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#include <fcntl.h>
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#include <libinput.h>
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#include <math.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/prctl.h>
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#include <sys/select.h>
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#include <unistd.h>
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/* Defines */
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#define MAXSLOTS 20
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#define INVALID -999999
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/* Types */
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enum { Left, Right, Down, Up };
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typedef int direction;
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typedef struct {
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int nfingers;
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direction start;
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direction end;
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char *command;
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} Gesture;
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/* Config */
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#include "config.h"
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/* Globals */
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Gesture *gestsarr;
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int gestsarrlen;
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direction pendingstart, pendingend;
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double xstart[MAXSLOTS], xend[MAXSLOTS], ystart[MAXSLOTS], yend[MAXSLOTS];
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unsigned fingsdown = 0, fingspending = 0;
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void
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die(char * msg)
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{
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fprintf(stderr, msg);
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exit(1);
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}
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void
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execcommand(char *c)
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{
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system(c);
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}
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static int
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libinputopenrestricted(const char *path, int flags, void *user_data)
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{
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int fd = open(path, flags);
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return fd < 0 ? -errno : fd;
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}
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static void
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libinputcloserestricted(int fd, void *user_data)
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{
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close(fd);
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}
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void
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touchdown(struct libinput_event *e)
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{
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struct libinput_event_touch *tevent;
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int slot;
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tevent = libinput_event_get_touch_event(e);
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slot = libinput_event_touch_get_slot(tevent);
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xstart[slot] = libinput_event_touch_get_x(tevent);
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ystart[slot] = libinput_event_touch_get_y(tevent);
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fingsdown++;
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}
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void
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touchmotion(struct libinput_event *e)
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{
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struct libinput_event_touch *tevent;
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int slot;
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tevent = libinput_event_get_touch_event(e);
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slot = libinput_event_touch_get_slot(tevent);
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xend[slot] = libinput_event_touch_get_x(tevent);
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yend[slot] = libinput_event_touch_get_y(tevent);
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}
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void
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touchup(struct libinput_event *e)
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{
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struct libinput_event_touch *tevent;
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direction start;
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direction end;
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int i;
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int slot;
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tevent = libinput_event_get_touch_event(e);
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slot = libinput_event_touch_get_slot(tevent);
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fingsdown--;
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if (xend[slot] == INVALID || xstart[slot] == INVALID) return;
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if (verbose) {
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fprintf(
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stderr,
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"(%d down fingers) (%d pending fingers) [start: x %lf y %lf] to [end x %lf y %lf]\n",
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fingsdown, fingspending, xstart[slot], ystart[slot], xend[slot], yend[slot]
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);
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}
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if (xend[slot] > xstart[slot] && fabs(xend[slot] - xstart[slot]) > threshold) {
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start = Left;
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end = Right;
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} else if (xend[slot] < xstart[slot] && fabs(xend[slot] - xstart[slot]) > threshold) {
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start = Right;
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end = Left;
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} else if (yend[slot] > ystart[slot] && fabs(yend[slot] - ystart[slot]) > threshold) {
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start = Up;
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end = Down;
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} else if (yend[slot] < ystart[slot] && fabs(yend[slot] - ystart[slot]) > threshold) {
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start = Down;
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end = Up;
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} else {
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if (verbose) {
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fprintf(stderr, "Input didn't match a known gesture\n");
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}
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start = INVALID;
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end = INVALID;
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}
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if (fingspending == 0) {
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pendingstart = start;
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pendingend = end;
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}
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if (pendingstart == start && pendingend == end) {
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fingspending++;
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}
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xend[slot] = INVALID;
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yend[slot] = INVALID;
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xstart[slot] = INVALID;
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ystart[slot] = INVALID;
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if (fingsdown == 0) {
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for (i = 0; i < gestsarrlen; i++) {
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if (verbose) {
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fprintf(stderr,
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"[Fingers/Start/End]: Cfg (%d/%d/%d) <=> Evt (%d/%d/%d)\n",
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gestsarr[i].nfingers, gestsarr[i].start, gestsarr[i].end,
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fingspending, pendingstart, pendingend
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);
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}
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if (
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gestsarr[i].nfingers == fingspending &&
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gestsarr[i].start == pendingstart &&
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gestsarr[i].end == pendingend
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) {
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if (verbose) {
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fprintf(stderr, "Execute %s\n", gestsarr[i].command);
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}
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execcommand(gestsarr[i].command);
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}
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}
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fingspending = 0;
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}
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}
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void
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run()
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{
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struct libinput *li;
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struct libinput_event *event;
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struct libinput_event_touch *tevent;
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struct libinput_device *d;
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int selectresult;
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fd_set fdset;
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const static struct libinput_interface interface = {
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.open_restricted = libinputopenrestricted,
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.close_restricted = libinputcloserestricted,
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};
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li = libinput_path_create_context(&interface, NULL);
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if ((d = libinput_path_add_device(li, device)) == NULL) {
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die("Couldn't bind event from dev filesystem\n");
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} else if (LIBINPUT_CONFIG_STATUS_SUCCESS != libinput_device_config_send_events_set_mode(
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d, LIBINPUT_CONFIG_SEND_EVENTS_ENABLED
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)) {
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die("Couldn't set mode to capture events\n");
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}
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FD_ZERO(&fdset);
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FD_SET(libinput_get_fd(li), &fdset);
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for (;;) {
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selectresult = select(FD_SETSIZE, &fdset, NULL, NULL, NULL);
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if (selectresult == -1) {
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die("Can't select on device node?\n");
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} else {
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libinput_dispatch(li);
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while ((event = libinput_get_event(li)) != NULL) {
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switch(libinput_event_get_type(event)) {
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case LIBINPUT_EVENT_TOUCH_DOWN: touchdown(event); break;
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case LIBINPUT_EVENT_TOUCH_UP: touchup(event); break;
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case LIBINPUT_EVENT_TOUCH_MOTION: touchmotion(event); break;
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}
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libinput_event_destroy(event);
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}
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}
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}
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libinput_unref(li);
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}
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int
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main(int argc, char *argv[])
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{
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int i, j;
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char *gestpt;
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gestsarr = malloc(0);
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gestsarrlen = 0;
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prctl(PR_SET_PDEATHSIG, SIGTERM);
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prctl(PR_SET_PDEATHSIG, SIGKILL);
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for (i = 1; i < argc; i++) {
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if (!strcmp(argv[i], "-v")) {
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verbose = 1;
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} else if (!strcmp(argv[i], "-d")) {
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device = argv[++i];
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} else if (!strcmp(argv[i], "-t")) {
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threshold = atoi(argv[++i]);
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} else if (!strcmp(argv[i], "-g")) {
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gestsarrlen++;
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realloc(gestsarr, (gestsarrlen * sizeof(Gesture)));
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gestpt = strtok(argv[++i], ",");
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for (j = 0; gestpt != NULL && j < 4; gestpt = strtok(NULL, ","), j++) {
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switch(j) {
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case 0: gestsarr[gestsarrlen - 1].nfingers = atoi(gestpt); break;
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case 1:
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if (!strcmp(gestpt, "l")) gestsarr[gestsarrlen-1].start = Left;
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if (!strcmp(gestpt, "r")) gestsarr[gestsarrlen-1].start = Right;
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if (!strcmp(gestpt, "d")) gestsarr[gestsarrlen-1].start = Down;
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if (!strcmp(gestpt, "u")) gestsarr[gestsarrlen-1].start = Up;
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break;
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case 2:
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if (!strcmp(gestpt, "l")) gestsarr[gestsarrlen-1].end = Left;
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if (!strcmp(gestpt, "r")) gestsarr[gestsarrlen-1].end = Right;
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if (!strcmp(gestpt, "d")) gestsarr[gestsarrlen-1].end = Down;
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if (!strcmp(gestpt, "u")) gestsarr[gestsarrlen-1].end = Up;
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break;
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case 3: gestsarr[gestsarrlen - 1].command = gestpt; break;
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}
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}
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}
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}
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// E.g. no gestures passed on CLI - used gestures defined in config.def.h
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if (gestsarrlen == 0) {
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gestsarr = malloc(sizeof(gestures));
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gestsarrlen = sizeof(gestures) / sizeof(Gesture);
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memcpy(gestsarr, gestures, sizeof(gestures));
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}
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run();
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return 0;
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}
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