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read win-title in non-blocking manner (#314) 

Closes: https://codeberg.org/nsxiv/nsxiv/issues/313
Reviewed-on: https://codeberg.org/nsxiv/nsxiv/pulls/314
Reviewed-by: eylles <eylles@noreply.codeberg.org>
This commit is contained in:
NRK 2023-01-09 08:12:30 +00:00
parent 16b966be3b
commit 34d4295103
1 changed files with 42 additions and 33 deletions
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75
main.c
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@ -78,17 +78,13 @@ static struct {
extcmd_t f, ft;
int fd;
pid_t pid;
} info;
} info, wintitle;
static struct {
extcmd_t f;
bool warned;
} keyhandler;
static struct {
extcmd_t f;
} wintitle;
static struct {
timeout_f handler;
struct timeval when;
@ -274,16 +270,41 @@ static bool check_timeouts(int *t)
return tmin > 0;
}
static size_t get_win_title(char *buf, size_t len)
static void kill_close(pid_t pid, int *fd)
{
if (fd != NULL && *fd != -1) {
kill(pid, SIGTERM);
close(*fd);
*fd = -1;
}
}
static void close_title(void)
{
kill_close(wintitle.pid, &wintitle.fd);
}
static void read_title(void)
{
ssize_t n;
char buf[512];
if ((n = read(wintitle.fd, buf, sizeof(buf)-1)) > 0) {
buf[n] = '\0';
win_set_title(&win, buf, n);
}
close_title();
}
static void open_title(void)
{
char *argv[8];
char w[12] = "", h[12] = "", z[12] = "", fidx[12], fcnt[12];
ssize_t n = -1;
int readfd;
if (wintitle.f.err || buf == NULL || len == 0)
return 0;
if (wintitle.f.err || !title_dirty)
return;
close_title();
if (mode == MODE_IMAGE) {
snprintf(w, ARRLEN(w), "%d", img.w);
snprintf(h, ARRLEN(h), "%d", img.h);
@ -293,22 +314,14 @@ static size_t get_win_title(char *buf, size_t len)
snprintf(fcnt, ARRLEN(fcnt), "%d", filecnt);
construct_argv(argv, ARRLEN(argv), wintitle.f.cmd, files[fileidx].path,
fidx, fcnt, w, h, z, NULL);
if (spawn(&readfd, NULL, argv) > 0) {
if ((n = read(readfd, buf, len-1)) > 0)
buf[n] = '\0';
close(readfd);
}
return MAX(0, n);
if ((wintitle.pid = spawn(&wintitle.fd, NULL, argv)) > 0)
fcntl(wintitle.fd, F_SETFL, O_NONBLOCK);
title_dirty = false;
}
void close_info(void)
{
if (info.fd != -1) {
kill(info.pid, SIGTERM);
close(info.fd);
info.fd = -1;
}
kill_close(info.pid, &info.fd);
}
void open_info(void)
@ -487,14 +500,7 @@ void redraw(void)
tns_render(&tns);
}
update_info();
if (title_dirty) {
size_t n;
char buf[512];
if ((n = get_win_title(buf, sizeof(buf))) > 0)
win_set_title(&win, buf, n);
title_dirty = false;
}
open_title();
win_draw(&win);
reset_timeout(redraw);
reset_cursor();
@ -722,7 +728,7 @@ static void on_buttonpress(const XButtonEvent *bev)
static void run(void)
{
enum { FD_X, FD_INFO, FD_ARL, FD_CNT };
enum { FD_X, FD_INFO, FD_TITLE, FD_ARL, FD_CNT };
struct pollfd pfd[FD_CNT];
int timeout = 0;
const struct timespec ten_ms = {0, 10000000};
@ -755,13 +761,16 @@ static void run(void)
} else {
pfd[FD_X].fd = ConnectionNumber(win.env.dpy);
pfd[FD_INFO].fd = info.fd;
pfd[FD_TITLE].fd = wintitle.fd;
pfd[FD_ARL].fd = arl.fd;
pfd[FD_X].events = pfd[FD_INFO].events = pfd[FD_ARL].events = POLLIN;
pfd[FD_X].events = pfd[FD_INFO].events = pfd[FD_TITLE].events = pfd[FD_ARL].events = POLLIN;
if (poll(pfd, ARRLEN(pfd), to_set ? timeout : -1) < 0)
continue;
if (pfd[FD_INFO].revents & POLLIN)
read_info();
if (pfd[FD_TITLE].revents & POLLIN)
read_title();
if (pfd[FD_ARL].revents & POLLIN) {
if (arl_handle(&arl)) {
/* when too fast, imlib2 can't load the image */
@ -922,7 +931,7 @@ int main(int argc, char *argv[])
} else {
error(0, 0, "Exec directory not found");
}
info.fd = -1;
wintitle.fd = info.fd = -1;
if (options->thumb_mode) {
mode = MODE_THUMB;