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sway/swaybar/i3bar.c
Joan Bruguera 94b69acf0d swaybar: Make hotspots block bar release bindings 
The previous commit prioritized hotspots before bar bindings for press events,
which matches i3's behaviour. However, since hotspots don't need to do any
processing on release events, those were not handled, and simply fell through
to `bindsym --release` bar bindings (if any).

This is counter-intuitive, and doesn't match i3's behaviour. Instead in case
a hotspot handles the press event, it should also handle the release event,
doing nothing, but blocking the event from triggering a --release bar binding.

E.g., in Sway, without this commit, this config. shows a text on tray clicks:

    bar {
        # ...
        bindsym --release button1 exec swaynag -m I_got_the_release_event.
    }

But the same configuration in i3 (with i3-nagbar) doesn't show the text.

Signed-off-by: Joan Bruguera <joanbrugueram@gmail.com>
2022-11-26 10:17:53 +01:00

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#define _POSIX_C_SOURCE 200809L
#include <json.h>
#include <linux/input-event-codes.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "log.h"
#include "swaybar/bar.h"
#include "swaybar/config.h"
#include "swaybar/i3bar.h"
#include "swaybar/input.h"
#include "swaybar/status_line.h"
void i3bar_block_unref(struct i3bar_block *block) {
if (block == NULL) {
return;
}
if (--block->ref_count == 0) {
free(block->full_text);
free(block->short_text);
free(block->align);
free(block->min_width_str);
free(block->name);
free(block->instance);
free(block);
}
}
static bool i3bar_parse_json_color(json_object *json, uint32_t *color) {
if (!json) {
return false;
}
const char *hexstring = json_object_get_string(json);
bool color_set = parse_color(hexstring, color);
if (!color_set) {
sway_log(SWAY_ERROR, "Ignoring invalid block hexadecimal color string: %s", hexstring);
}
return color_set;
}
static void i3bar_parse_json(struct status_line *status,
struct json_object *json_array) {
struct i3bar_block *block, *tmp;
wl_list_for_each_safe(block, tmp, &status->blocks, link) {
wl_list_remove(&block->link);
i3bar_block_unref(block);
}
for (size_t i = 0; i < json_object_array_length(json_array); ++i) {
json_object *full_text, *short_text, *color, *min_width, *align, *urgent;
json_object *name, *instance, *separator, *separator_block_width;
json_object *background, *border, *border_top, *border_bottom;
json_object *border_left, *border_right, *markup;
json_object *json = json_object_array_get_idx(json_array, i);
if (!json) {
continue;
}
json_object_object_get_ex(json, "full_text", &full_text);
json_object_object_get_ex(json, "short_text", &short_text);
json_object_object_get_ex(json, "color", &color);
json_object_object_get_ex(json, "min_width", &min_width);
json_object_object_get_ex(json, "align", &align);
json_object_object_get_ex(json, "urgent", &urgent);
json_object_object_get_ex(json, "name", &name);
json_object_object_get_ex(json, "instance", &instance);
json_object_object_get_ex(json, "markup", &markup);
json_object_object_get_ex(json, "separator", &separator);
json_object_object_get_ex(json, "separator_block_width", &separator_block_width);
json_object_object_get_ex(json, "background", &background);
json_object_object_get_ex(json, "border", &border);
json_object_object_get_ex(json, "border_top", &border_top);
json_object_object_get_ex(json, "border_bottom", &border_bottom);
json_object_object_get_ex(json, "border_left", &border_left);
json_object_object_get_ex(json, "border_right", &border_right);
struct i3bar_block *block = calloc(1, sizeof(struct i3bar_block));
block->ref_count = 1;
block->full_text = full_text ?
strdup(json_object_get_string(full_text)) : NULL;
block->short_text = short_text ?
strdup(json_object_get_string(short_text)) : NULL;
block->color_set = i3bar_parse_json_color(color, &block->color);
if (min_width) {
json_type type = json_object_get_type(min_width);
if (type == json_type_int) {
block->min_width = json_object_get_int(min_width);
} else if (type == json_type_string) {
/* the width will be calculated when rendering */
block->min_width_str = strdup(json_object_get_string(min_width));
}
}
block->align = strdup(align ? json_object_get_string(align) : "left");
block->urgent = urgent ? json_object_get_int(urgent) : false;
block->name = name ? strdup(json_object_get_string(name)) : NULL;
block->instance = instance ?
strdup(json_object_get_string(instance)) : NULL;
if (markup) {
block->markup = false;
const char *markup_str = json_object_get_string(markup);
if (strcmp(markup_str, "pango") == 0) {
block->markup = true;
}
}
block->separator = separator ? json_object_get_int(separator) : true;
block->separator_block_width = separator_block_width ?
json_object_get_int(separator_block_width) : 9;
// Airblader features
i3bar_parse_json_color(background, &block->background);
block->border_set = i3bar_parse_json_color(border, &block->border);
block->border_top = border_top ? json_object_get_int(border_top) : 1;
block->border_bottom = border_bottom ?
json_object_get_int(border_bottom) : 1;
block->border_left = border_left ? json_object_get_int(border_left) : 1;
block->border_right = border_right ?
json_object_get_int(border_right) : 1;
wl_list_insert(&status->blocks, &block->link);
}
}
bool i3bar_handle_readable(struct status_line *status) {
while (!status->started) { // look for opening bracket
for (size_t c = 0; c < status->buffer_index; ++c) {
if (status->buffer[c] == '[') {
status->started = true;
status->buffer_index -= ++c;
memmove(status->buffer, &status->buffer[c], status->buffer_index);
break;
} else if (!isspace(status->buffer[c])) {
sway_log(SWAY_DEBUG, "Invalid i3bar json: expected '[' but encountered '%c'",
status->buffer[c]);
status_error(status, "[invalid i3bar json]");
return true;
}
}
if (status->started) {
break;
}
errno = 0;
ssize_t read_bytes = read(status->read_fd, status->buffer, status->buffer_size);
if (read_bytes > -1) {
status->buffer_index = read_bytes;
} else if (errno == EAGAIN) {
return false;
} else {
status_error(status, "[error reading from status command]");
return true;
}
}
struct json_object *last_object = NULL;
struct json_object *test_object;
size_t buffer_pos = 0;
while (true) {
// since the incoming stream is an infinite array
// parsing is split into two parts
// first, attempt to parse the current object, reading more if the
// parser indicates that the current object is incomplete, and failing
// if the parser fails
// second, look for separating comma, ignoring whitespace, failing if
// any other characters are encountered
if (status->expecting_comma) {
for (; buffer_pos < status->buffer_index; ++buffer_pos) {
if (status->buffer[buffer_pos] == ',') {
status->expecting_comma = false;
++buffer_pos;
break;
} else if (!isspace(status->buffer[buffer_pos])) {
sway_log(SWAY_DEBUG, "Invalid i3bar json: expected ',' but encountered '%c'",
status->buffer[buffer_pos]);
status_error(status, "[invalid i3bar json]");
return true;
}
}
if (buffer_pos < status->buffer_index) {
continue; // look for new object without reading more input
}
buffer_pos = status->buffer_index = 0;
} else {
test_object = json_tokener_parse_ex(status->tokener,
&status->buffer[buffer_pos], status->buffer_index - buffer_pos);
enum json_tokener_error err = json_tokener_get_error(status->tokener);
if (err == json_tokener_success) {
if (json_object_get_type(test_object) == json_type_array) {
if (last_object) {
json_object_put(last_object);
}
last_object = test_object;
} else {
json_object_put(test_object);
}
// in order to print the json for debugging purposes
// the last character is temporarily replaced with a null character
// (the last character is used in case the buffer is full)
char *last_char_pos =
&status->buffer[buffer_pos + status->tokener->char_offset - 1];
char last_char = *last_char_pos;
while (isspace(last_char)) {
last_char = *--last_char_pos;
}
*last_char_pos = '\0';
size_t offset = strspn(&status->buffer[buffer_pos], " \f\n\r\t\v");
sway_log(SWAY_DEBUG, "Received i3bar json: '%s%c'",
&status->buffer[buffer_pos + offset], last_char);
*last_char_pos = last_char;
buffer_pos += status->tokener->char_offset;
status->expecting_comma = true;
if (buffer_pos < status->buffer_index) {
continue; // look for comma without reading more input
}
buffer_pos = status->buffer_index = 0;
} else if (err == json_tokener_continue) {
json_tokener_reset(status->tokener);
if (status->buffer_index < status->buffer_size) {
// move the object to the start of the buffer
status->buffer_index -= buffer_pos;
memmove(status->buffer, &status->buffer[buffer_pos],
status->buffer_index);
buffer_pos = 0;
} else {
// expand buffer
status->buffer_size *= 2;
char *new_buffer = realloc(status->buffer, status->buffer_size);
if (new_buffer) {
status->buffer = new_buffer;
} else {
free(status->buffer);
status_error(status, "[failed to allocate buffer]");
return true;
}
}
} else {
char last_char = status->buffer[status->buffer_index - 1];
status->buffer[status->buffer_index - 1] = '\0';
sway_log(SWAY_DEBUG, "Failed to parse i3bar json - %s: '%s%c'",
json_tokener_error_desc(err), &status->buffer[buffer_pos], last_char);
status_error(status, "[failed to parse i3bar json]");
return true;
}
}
errno = 0;
ssize_t read_bytes = read(status->read_fd, &status->buffer[status->buffer_index],
status->buffer_size - status->buffer_index);
if (read_bytes > -1) {
status->buffer_index += read_bytes;
} else if (errno == EAGAIN) {
break;
} else {
status_error(status, "[error reading from status command]");
return true;
}
}
if (last_object) {
sway_log(SWAY_DEBUG, "Rendering last received json");
i3bar_parse_json(status, last_object);
json_object_put(last_object);
return true;
} else {
return false;
}
}
enum hotspot_event_handling i3bar_block_send_click(struct status_line *status,
struct i3bar_block *block, double x, double y, double rx, double ry,
double w, double h, int scale, uint32_t button, bool released) {
sway_log(SWAY_DEBUG, "block %s clicked", block->name);
if (!block->name || !status->click_events) {
return HOTSPOT_PROCESS;
}
if (released) {
// Since we handle the pressed event, also handle the released event
// to block it from falling through to a binding in the bar
return HOTSPOT_IGNORE;
}
struct json_object *event_json = json_object_new_object();
json_object_object_add(event_json, "name",
json_object_new_string(block->name));
if (block->instance) {
json_object_object_add(event_json, "instance",
json_object_new_string(block->instance));
}
json_object_object_add(event_json, "button",
json_object_new_int(event_to_x11_button(button)));
json_object_object_add(event_json, "event", json_object_new_int(button));
if (status->float_event_coords) {
json_object_object_add(event_json, "x", json_object_new_double(x));
json_object_object_add(event_json, "y", json_object_new_double(y));
json_object_object_add(event_json, "relative_x", json_object_new_double(rx));
json_object_object_add(event_json, "relative_y", json_object_new_double(ry));
json_object_object_add(event_json, "width", json_object_new_double(w));
json_object_object_add(event_json, "height", json_object_new_double(h));
} else {
json_object_object_add(event_json, "x", json_object_new_int(x));
json_object_object_add(event_json, "y", json_object_new_int(y));
json_object_object_add(event_json, "relative_x", json_object_new_int(rx));
json_object_object_add(event_json, "relative_y", json_object_new_int(ry));
json_object_object_add(event_json, "width", json_object_new_int(w));
json_object_object_add(event_json, "height", json_object_new_int(h));
}
json_object_object_add(event_json, "scale", json_object_new_int(scale));
if (dprintf(status->write_fd, "%s%s\n", status->clicked ? "," : "",
json_object_to_json_string(event_json)) < 0) {
status_error(status, "[failed to write click event]");
}
status->clicked = true;
json_object_put(event_json);
return HOTSPOT_IGNORE;
}
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