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Add optional bidirectional interface to i3bar. (ver.6)

Patch status: superseded

Patch by enkore

Long description:

If the child specifies bidirectional:1 in the protocl header,
a JSON array will be streamed to it's stdin.
It consists of maps with at least one key (command).

Such a map is emitted if the user clicks on a status block. i.e.
{"command":"block_clicked","name":"some_block_name","instance":"optional_instance"}

The basic output format is like the rest of the i3bar protocol (i.e.
a new line after each element (map in this case))

The second version of this patch mainly introduced a better API for sending
commands.

The third version of this patch introduced the additional button parameter and thus
added support for right clicks. Now root window coordinates are passed instead of
window coordinates.

The fourth version of this patch (re-)added closing of unused pipe fd's.
Some superfluous whitespace was removed, too.

The fifth version of this patch changed some implementation details and
added handling of all mouse buttons by the child.

The sixth version of this patch changed the bidirectional-key in the
protocol header to a boolean.

To apply this patch, use:
curl http://cr.i3wm.org/patch/76/raw.patch | git am

b/docs/i3bar-protocol

@@ -51,7 +51,7 @@ consists of a single JSON hash:
 
 *All features example*:
 ------------------------------
-{ "version": 1, "stop_signal": 10, "cont_signal": 12 }
+{ "version": 1, "stop_signal": 10, "cont_signal": 12, "bidirectional": 1 }
 ------------------------------
 
 (Note that before i3 v4.3 the precise format had to be +{"version":1}+,
@@ -110,6 +110,9 @@ cont_signal::
 	Specify to i3bar the signal (as an integer)to send to continue your
 	processing.
 	The default value (if none is specified) is SIGCONT.
+bidirectional::
+	If specified and true i3bar will write a infinite array (same as above)
+	to your stdin.
 
 === Blocks in detail
 
@@ -183,3 +186,33 @@ An example of a block which uses all possible entries follows:
  "instance": "eth0"
 }
 ------------------------------------------
+
+=== Bidirectional communication
+
+If enabled i3bar will send you notifications about certain events, currently
+only one such notification is implemented: block_clicked.
+It is sent if the user clicks on a block and looks like this:
+
+command::
+	Always block_clicked at the moment, but more are maybe added later.
+name::
+	Name of the block, if set
+instance::
+	Instance of the block, if set
+x, y::
+	X11 root window coordinates where the click occured
+button:
+	X11 button ID (for example 1 to 3 for left/middle/right mouse button
+    or 4/5 for mouse wheel up respectively down)
+
+*Example*:
+------------------------------------------
+{
+ "command": "block_clicked",
+ "name": "ethernet",
+ "instance": "eth0",
+ "button": 1,
+ "x": 1320,
+ "y": 1400
+}
+------------------------------------------

b/i3bar/include/child.h

@@ -33,6 +33,12 @@ typedef struct {
      * The signal requested by the client to inform it of theun hidden state of i3bar
      */
     int cont_signal;
+
+    /**
+     * Enable bi-directional communication, i.e. on-click events
+     */
+    bool bidirectional;
+    bool bidirectional_init;
 } i3bar_child;
 
 /*
@@ -68,4 +74,10 @@ void stop_child(void);
  */
 void cont_child(void);
 
+/*
+ * ends the block_clicked command to the child
+ *
+ */
+void send_block_clicked(int button, const char *name, const char *instance, int x, int y);
+
 #endif

b/i3bar/include/common.h

@@ -50,6 +50,10 @@ struct status_block {
     uint32_t x_offset;
     uint32_t x_append;
 
+    /* Optional */
+    char *name;
+    char *instance;
+
     TAILQ_ENTRY(status_block) blocks;
 };
 

b/i3bar/src/child.c

@@ -21,6 +21,7 @@
 #include <yajl/yajl_common.h>
 #include <yajl/yajl_parse.h>
 #include <yajl/yajl_version.h>
+#include <yajl/yajl_gen.h>
 
 #include "common.h"
 
@@ -35,6 +36,9 @@ ev_child *child_sig;
 yajl_callbacks callbacks;
 yajl_handle parser;
 
+/* JSON generator for stdout */
+yajl_gen gen;
+
 typedef struct parser_ctx {
     /* True if one of the parsed blocks was urgent */
     bool has_urgent;
@@ -141,6 +145,18 @@ static int stdin_string(void *context, const unsigned char *val, unsigned int le
             ctx->block.align = ALIGN_CENTER;
         }
     }
+    if (strcasecmp(ctx->last_map_key, "name") == 0) {
+        char *copy = (char*)malloc(len+1);
+        strncpy(copy, (const char *)val, len);
+        copy[len] = 0;
+        ctx->block.name = copy;
+    }
+    if (strcasecmp(ctx->last_map_key, "instance") == 0) {
+        char *copy = (char*)malloc(len+1);
+        strncpy(copy, (const char *)val, len);
+        copy[len] = 0;
+        ctx->block.instance = copy;
+    }
     return 1;
 }
 
@@ -322,6 +338,18 @@ void child_sig_cb(struct ev_loop *loop, ev_child *watcher, int revents) {
     cleanup();
 }
 
+void child_write_output(void) {
+    if(child.bidirectional) {
+        const unsigned char *output;
+        size_t size;
+        yajl_gen_get_buf(gen, &output, &size);
+        fwrite(output, 1, size, stdout);
+        fwrite("\n", 1, 1, stdout);
+        fflush(stdout);
+        yajl_gen_clear(gen);
+    }
+}
+
 /*
  * Start a child-process with the specified command and reroute stdin.
  * We actually start a $SHELL to execute the command so we don't have to care
@@ -347,10 +375,16 @@ void start_child(char *command) {
     parser = yajl_alloc(&callbacks, NULL, &parser_context);
 #endif
 
+    gen = yajl_gen_alloc(NULL);
+
     if (command != NULL) {
-        int fd[2];
-        if (pipe(fd) == -1)
-            err(EXIT_FAILURE, "pipe(fd)");
+        int pipe_in[2]; /* pipe we read from */
+        int pipe_out[2]; /* pipe we write to */
+
+        if (pipe(pipe_in) == -1)
+            err(EXIT_FAILURE, "pipe(pipe_in)");
+        if (pipe(pipe_out) == -1)
+            err(EXIT_FAILURE, "pipe(pipe_out)");
 
         child.pid = fork();
         switch (child.pid) {
@@ -358,10 +392,13 @@ void start_child(char *command) {
                 ELOG("Couldn't fork(): %s\n", strerror(errno));
                 exit(EXIT_FAILURE);
             case 0:
-                /* Child-process. Reroute stdout and start shell */
-                close(fd[0]);
+                /* Child-process. Reroute streams and start shell */
 
-                dup2(fd[1], STDOUT_FILENO);
+                close(pipe_in[0]);
+                close(pipe_out[1]);
+
+                dup2(pipe_in[1], STDOUT_FILENO);
+                dup2(pipe_out[0], STDIN_FILENO);
 
                 static const char *shell = NULL;
 
@@ -371,10 +408,13 @@ void start_child(char *command) {
                 execl(shell, shell, "-c", command, (char*) NULL);
                 return;
             default:
-                /* Parent-process. Rerout stdin */
-                close(fd[1]);
+                /* Parent-process. Reroute streams */
+
+                close(pipe_in[1]);
+                close(pipe_out[0]);
 
-                dup2(fd[0], STDIN_FILENO);
+                dup2(pipe_in[0], STDIN_FILENO);
+                dup2(pipe_out[1], STDOUT_FILENO);
 
                 break;
         }
@@ -396,6 +436,69 @@ void start_child(char *command) {
 }
 
 /*
+ * Internal helper functions for bidirectional comms
+ *
+ */
+void child_bidi_initialize(void) {
+    if(!child.bidirectional_init) {
+        yajl_gen_array_open(gen);
+        child_write_output();
+        child.bidirectional_init = true;
+    }
+}
+
+void child_bidi_key(const char *key) {
+    yajl_gen_string(gen, (const unsigned char *)key, strlen(key));
+}
+
+void child_bidi_open(const char *command) {
+    child_bidi_initialize();
+
+    yajl_gen_map_open(gen);
+
+    child_bidi_key("command");
+    yajl_gen_string(gen, (const unsigned char *)command, strlen(command));
+}
+
+void child_bidi_close(void) {
+    yajl_gen_map_close(gen);
+    child_write_output();
+}
+
+/*
+ * sends the block_clicked command to the child
+ *
+ */
+void send_block_clicked(int button, const char *name, const char *instance, int x, int y) {
+    if(child.bidirectional) {
+        child_bidi_open("block_clicked");
+
+        if(name) {
+            child_bidi_key("name");
+            yajl_gen_string(gen, (const unsigned char *)name, strlen(name));
+        }
+
+        if(instance) {
+            child_bidi_key("instance");
+            yajl_gen_string(gen, (const unsigned char *)instance, strlen(instance));
+        }
+
+        child_bidi_key("button");
+        yajl_gen_integer(gen, button);
+
+        child_bidi_key("x");
+        yajl_gen_integer(gen, x);
+
+        child_bidi_key("y");
+        yajl_gen_integer(gen, y);
+
+        yajl_gen_map_close(gen);
+
+        child_write_output();
+    }
+}
+
+/*
  * kill()s the child-process (if any). Called when exit()ing.
  *
  */

b/i3bar/src/parse_json_header.c

@@ -31,6 +31,7 @@ static enum {
     KEY_VERSION,
     KEY_STOP_SIGNAL,
     KEY_CONT_SIGNAL,
+    KEY_BIDIRECTIONAL,
     NO_KEY
 } current_key;
 
@@ -54,6 +55,21 @@ static int header_integer(void *ctx, long val) {
         default:
             break;
     }
+
+    return 1;
+}
+
+static int header_boolean(void *ctx, int val) {
+    i3bar_child *child = ctx;
+
+    switch (current_key) {
+        case KEY_BIDIRECTIONAL:
+            child->bidirectional = val ? true : false;
+            break;
+        default:
+            break;
+    }
+
     return 1;
 }
 
@@ -71,13 +87,15 @@ static int header_map_key(void *ctx, const unsigned char *stringval, unsigned in
         current_key = KEY_STOP_SIGNAL;
     } else if (CHECK_KEY("cont_signal")) {
         current_key = KEY_CONT_SIGNAL;
+    } else if (CHECK_KEY("bidirectional")) {
+        current_key = KEY_BIDIRECTIONAL;
     }
     return 1;
 }
 
 static yajl_callbacks version_callbacks = {
     NULL, /* null */
-    NULL, /* boolean */
+    &header_boolean, /* boolean */
     &header_integer,
     NULL, /* double */
     NULL, /* number */

b/i3bar/src/xcb.c

@@ -306,23 +306,56 @@ void handle_button(xcb_button_press_event_t *event) {
     }
 
     int32_t x = event->event_x >= 0 ? event->event_x : 0;
+    int32_t original_x = x;
 
     DLOG("Got Button %d\n", event->detail);
 
-    switch (event->detail) {
-        case 1:
-            /* Left Mousbutton. We determine, which button was clicked
-             * and set cur_ws accordingly */
-            TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
-                DLOG("x = %d\n", x);
-                if (x >= 0 && x < cur_ws->name_width + 10) {
-                    break;
-                }
-                x -= cur_ws->name_width + 11;
-            }
-            if (cur_ws == NULL) {
+
+    /* Check if this event regards a workspace button */
+    TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
+        DLOG("x = %d\n", x);
+        if (x >= 0 && x < cur_ws->name_width + 10) {
+            break;
+        }
+        x -= cur_ws->name_width + 11;
+    }
+
+    if (cur_ws == NULL) {
+        /* No workspace button was pressed.
+         * Check if a status block has been clicked.
+         * This of course only has an effect,
+         * if the child reported bidirectional protocol usage. */
+
+        /* First calculate width of tray area */
+        trayclient *trayclient;
+        int tray_width = 0;
+        TAILQ_FOREACH_REVERSE(trayclient, walk->trayclients, tc_head, tailq) {
+            if (!trayclient->mapped)
+                continue;
+            tray_width += (font.height + 2);
+        }
+
+        int block_x = 0, last_block_x;
+        int offset = (walk->rect.w - (statusline_width + tray_width)) - 10;
+
+        x = original_x - offset > 0 ? original_x - offset : 0;
+
+        struct status_block *block;
+
+        TAILQ_FOREACH(block, &statusline_head, blocks) {
+            last_block_x = block_x;
+            block_x += block->width + block->x_offset + block->x_append;
+
+            if(x <= block_x && x >= last_block_x) {
+                send_block_clicked(event->detail, block->name, block->instance, event->root_x, event->root_y);
                 return;
             }
+        }
+        return;
+    }
+
+    switch (event->detail) {
+        case 1:
             break;
         case 4:
             /* Mouse wheel up. We select the previous ws, if any.
@@ -344,6 +377,9 @@ void handle_button(xcb_button_press_event_t *event) {
 
             cur_ws = TAILQ_NEXT(cur_ws, tailq);
             break;
+        default:
+            /* Return if other mouse button */
+            return;
     }
 
     /* To properly handle workspace names with double quotes in them, we need

100	@@ -33,6 +33,12 @@ typedef struct {
101	* The signal requested by the client to inform it of theun hidden state of i3bar
102	*/
103	int cont_signal;
104	+
105	+ /**
106	+ * Enable bi-directional communication, i.e. on-click events
107	+ */
108	+ bool bidirectional;
109	+ bool bidirectional_init;
110	} i3bar_child;
111
112	/*
113	@@ -68,4 +74,10 @@ void stop_child(void);
114	*/
115	void cont_child(void);
116
117	+/*
118	+ * ends the block_clicked command to the child
119	+ *
120	+ */
121	+void send_block_clicked(int button, const char name, const char instance, int x, int y);
122	+
123	#endif

128	@@ -50,6 +50,10 @@ struct status_block {
129	uint32_t x_offset;
130	uint32_t x_append;
131
132	+ /* Optional */
133	+ char *name;
134	+ char *instance;
135	+
136	TAILQ_ENTRY(status_block) blocks;
137	};
138

143	@@ -21,6 +21,7 @@
144	#include <yajl/yajl_common.h>
145	#include <yajl/yajl_parse.h>
146	#include <yajl/yajl_version.h>
147	+#include <yajl/yajl_gen.h>
148
149	#include "common.h"
150
151	@@ -35,6 +36,9 @@ ev_child *child_sig;
152	yajl_callbacks callbacks;
153	yajl_handle parser;
154
155	+/* JSON generator for stdout */
156	+yajl_gen gen;
157	+
158	typedef struct parser_ctx {
159	/* True if one of the parsed blocks was urgent */
160	bool has_urgent;
161	@@ -141,6 +145,18 @@ static int stdin_string(void context, const unsigned char val, unsigned int le
162	ctx->block.align = ALIGN_CENTER;
163	}
164	}
165	+ if (strcasecmp(ctx->last_map_key, "name") == 0) {
166	+ char copy = (char)malloc(len+1);
167	+ strncpy(copy, (const char *)val, len);
168	+ copy[len] = 0;
169	+ ctx->block.name = copy;
170	+ }
171	+ if (strcasecmp(ctx->last_map_key, "instance") == 0) {
172	+ char copy = (char)malloc(len+1);
173	+ strncpy(copy, (const char *)val, len);
174	+ copy[len] = 0;
175	+ ctx->block.instance = copy;
176	+ }
177	return 1;
178	}
179
180	@@ -322,6 +338,18 @@ void child_sig_cb(struct ev_loop loop, ev_child watcher, int revents) {
181	cleanup();
182	}
183
184	+void child_write_output(void) {
185	+ if(child.bidirectional) {
186	+ const unsigned char *output;
187	+ size_t size;
188	+ yajl_gen_get_buf(gen, &output, &size);
189	+ fwrite(output, 1, size, stdout);
190	+ fwrite("\n", 1, 1, stdout);
191	+ fflush(stdout);
192	+ yajl_gen_clear(gen);
193	+ }
194	+}
195	+
196	/*
197	* Start a child-process with the specified command and reroute stdin.
198	* We actually start a $SHELL to execute the command so we don't have to care
199	@@ -347,10 +375,16 @@ void start_child(char *command) {
200	parser = yajl_alloc(&callbacks, NULL, &parser_context);
201	#endif
202
203	+ gen = yajl_gen_alloc(NULL);
204	+
205	if (command != NULL) {
206	- int fd[2];
207	- if (pipe(fd) == -1)
208	- err(EXIT_FAILURE, "pipe(fd)");
209	+ int pipe_in[2]; /* pipe we read from */
210	+ int pipe_out[2]; /* pipe we write to */
211	+
212	+ if (pipe(pipe_in) == -1)
213	+ err(EXIT_FAILURE, "pipe(pipe_in)");
214	+ if (pipe(pipe_out) == -1)
215	+ err(EXIT_FAILURE, "pipe(pipe_out)");
216
217	child.pid = fork();
218	switch (child.pid) {
219	@@ -358,10 +392,13 @@ void start_child(char *command) {
220	ELOG("Couldn't fork(): %s\n", strerror(errno));
221	exit(EXIT_FAILURE);
222	case 0:
223	- /* Child-process. Reroute stdout and start shell */
224	- close(fd[0]);
225	+ /* Child-process. Reroute streams and start shell */
226
227	- dup2(fd[1], STDOUT_FILENO);
228	+ close(pipe_in[0]);
229	+ close(pipe_out[1]);
230	+
231	+ dup2(pipe_in[1], STDOUT_FILENO);
232	+ dup2(pipe_out[0], STDIN_FILENO);
233
234	static const char *shell = NULL;
235
236	@@ -371,10 +408,13 @@ void start_child(char *command) {
237	execl(shell, shell, "-c", command, (char*) NULL);
238	return;
239	default:
240	- /* Parent-process. Rerout stdin */
241	- close(fd[1]);
242	+ /* Parent-process. Reroute streams */
243	+
244	+ close(pipe_in[1]);
245	+ close(pipe_out[0]);
246
247	- dup2(fd[0], STDIN_FILENO);
248	+ dup2(pipe_in[0], STDIN_FILENO);
249	+ dup2(pipe_out[1], STDOUT_FILENO);
250
251	break;
252	}
253	@@ -396,6 +436,69 @@ void start_child(char *command) {
254	}
255
256	/*
257	+ * Internal helper functions for bidirectional comms
258	+ *
259	+ */
260	+void child_bidi_initialize(void) {
261	+ if(!child.bidirectional_init) {
262	+ yajl_gen_array_open(gen);
263	+ child_write_output();
264	+ child.bidirectional_init = true;
265	+ }
266	+}
267	+
268	+void child_bidi_key(const char *key) {
269	+ yajl_gen_string(gen, (const unsigned char *)key, strlen(key));
270	+}
271	+
272	+void child_bidi_open(const char *command) {
273	+ child_bidi_initialize();
274	+
275	+ yajl_gen_map_open(gen);
276	+
277	+ child_bidi_key("command");
278	+ yajl_gen_string(gen, (const unsigned char *)command, strlen(command));
279	+}
280	+
281	+void child_bidi_close(void) {
282	+ yajl_gen_map_close(gen);
283	+ child_write_output();
284	+}
285	+
286	+/*
287	+ * sends the block_clicked command to the child
288	+ *
289	+ */
290	+void send_block_clicked(int button, const char name, const char instance, int x, int y) {
291	+ if(child.bidirectional) {
292	+ child_bidi_open("block_clicked");
293	+
294	+ if(name) {
295	+ child_bidi_key("name");
296	+ yajl_gen_string(gen, (const unsigned char *)name, strlen(name));
297	+ }
298	+
299	+ if(instance) {
300	+ child_bidi_key("instance");
301	+ yajl_gen_string(gen, (const unsigned char *)instance, strlen(instance));
302	+ }
303	+
304	+ child_bidi_key("button");
305	+ yajl_gen_integer(gen, button);
306	+
307	+ child_bidi_key("x");
308	+ yajl_gen_integer(gen, x);
309	+
310	+ child_bidi_key("y");
311	+ yajl_gen_integer(gen, y);
312	+
313	+ yajl_gen_map_close(gen);
314	+
315	+ child_write_output();
316	+ }
317	+}
318	+
319	+/*
320	* kill()s the child-process (if any). Called when exit()ing.
321	*
322	*/

327	@@ -31,6 +31,7 @@ static enum {
328	KEY_VERSION,
329	KEY_STOP_SIGNAL,
330	KEY_CONT_SIGNAL,
331	+ KEY_BIDIRECTIONAL,
332	NO_KEY
333	} current_key;
334
335	@@ -54,6 +55,21 @@ static int header_integer(void *ctx, long val) {
336	default:
337	break;
338	}
339	+
340	+ return 1;
341	+}
342	+
343	+static int header_boolean(void *ctx, int val) {
344	+ i3bar_child *child = ctx;
345	+
346	+ switch (current_key) {
347	+ case KEY_BIDIRECTIONAL:
348	+ child->bidirectional = val ? true : false;
349	+ break;
350	+ default:
351	+ break;
352	+ }
353	+
354	return 1;
355	}
356
357	@@ -71,13 +87,15 @@ static int header_map_key(void ctx, const unsigned char stringval, unsigned in
358	current_key = KEY_STOP_SIGNAL;
359	} else if (CHECK_KEY("cont_signal")) {
360	current_key = KEY_CONT_SIGNAL;
361	+ } else if (CHECK_KEY("bidirectional")) {
362	+ current_key = KEY_BIDIRECTIONAL;
363	}
364	return 1;
365	}
366
367	static yajl_callbacks version_callbacks = {
368	NULL, /* null */
369	- NULL, /* boolean */
370	+ &header_boolean, /* boolean */
371	&header_integer,
372	NULL, /* double */
373	NULL, /* number */

378	@@ -306,23 +306,56 @@ void handle_button(xcb_button_press_event_t *event) {
379	}
380
381	int32_t x = event->event_x >= 0 ? event->event_x : 0;
382	+ int32_t original_x = x;
383
384	DLOG("Got Button %d\n", event->detail);
385
386	- switch (event->detail) {
387	- case 1:
388	- /* Left Mousbutton. We determine, which button was clicked
389	- * and set cur_ws accordingly */
390	- TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
391	- DLOG("x = %d\n", x);
392	- if (x >= 0 && x < cur_ws->name_width + 10) {
393	- break;
394	- }
395	- x -= cur_ws->name_width + 11;
396	- }
397	- if (cur_ws == NULL) {
398	+
399	+ /* Check if this event regards a workspace button */
400	+ TAILQ_FOREACH(cur_ws, walk->workspaces, tailq) {
401	+ DLOG("x = %d\n", x);
402	+ if (x >= 0 && x < cur_ws->name_width + 10) {
403	+ break;
404	+ }
405	+ x -= cur_ws->name_width + 11;
406	+ }
407	+
408	+ if (cur_ws == NULL) {
409	+ /* No workspace button was pressed.
410	+ * Check if a status block has been clicked.
411	+ * This of course only has an effect,
412	+ * if the child reported bidirectional protocol usage. */
413	+
414	+ /* First calculate width of tray area */
415	+ trayclient *trayclient;
416	+ int tray_width = 0;
417	+ TAILQ_FOREACH_REVERSE(trayclient, walk->trayclients, tc_head, tailq) {
418	+ if (!trayclient->mapped)
419	+ continue;
420	+ tray_width += (font.height + 2);
421	+ }
422	+
423	+ int block_x = 0, last_block_x;
424	+ int offset = (walk->rect.w - (statusline_width + tray_width)) - 10;
425	+
426	+ x = original_x - offset > 0 ? original_x - offset : 0;
427	+
428	+ struct status_block *block;
429	+
430	+ TAILQ_FOREACH(block, &statusline_head, blocks) {
431	+ last_block_x = block_x;
432	+ block_x += block->width + block->x_offset + block->x_append;
433	+
434	+ if(x <= block_x && x >= last_block_x) {
435	+ send_block_clicked(event->detail, block->name, block->instance, event->root_x, event->root_y);
436	return;
437	}
438	+ }
439	+ return;
440	+ }
441	+
442	+ switch (event->detail) {
443	+ case 1:
444	break;
445	case 4:
446	/* Mouse wheel up. We select the previous ws, if any.
447	@@ -344,6 +377,9 @@ void handle_button(xcb_button_press_event_t *event) {
448
449	cur_ws = TAILQ_NEXT(cur_ws, tailq);
450	break;
451	+ default:
452	+ /* Return if other mouse button */
453	+ return;
454	}
455
456	/* To properly handle workspace names with double quotes in them, we need

43	@@ -51,7 +51,7 @@ consists of a single JSON hash:
44
45	All features example:
46	------------------------------
47	-{ "version": 1, "stop_signal": 10, "cont_signal": 12 }
48	+{ "version": 1, "stop_signal": 10, "cont_signal": 12, "bidirectional": 1 }
49	------------------------------
50
51	(Note that before i3 v4.3 the precise format had to be +{"version":1}+,
52	@@ -110,6 +110,9 @@ cont_signal::
53	Specify to i3bar the signal (as an integer)to send to continue your
54	processing.
55	The default value (if none is specified) is SIGCONT.
56	+bidirectional::
57	+ If specified and true i3bar will write a infinite array (same as above)
58	+ to your stdin.
59
60	=== Blocks in detail
61
62	@@ -183,3 +186,33 @@ An example of a block which uses all possible entries follows:
63	"instance": "eth0"
64	}
65	------------------------------------------
66	+
67	+=== Bidirectional communication
68	+
69	+If enabled i3bar will send you notifications about certain events, currently
70	+only one such notification is implemented: block_clicked.
71	+It is sent if the user clicks on a block and looks like this:
72	+
73	+command::
74	+ Always block_clicked at the moment, but more are maybe added later.
75	+name::
76	+ Name of the block, if set
77	+instance::
78	+ Instance of the block, if set
79	+x, y::
80	+ X11 root window coordinates where the click occured
81	+button:
82	+ X11 button ID (for example 1 to 3 for left/middle/right mouse button
83	+ or 4/5 for mouse wheel up respectively down)
84	+
85	+Example:
86	+------------------------------------------
87	+{
88	+ "command": "block_clicked",
89	+ "name": "ethernet",
90	+ "instance": "eth0",
91	+ "button": 1,
92	+ "x": 1320,
93	+ "y": 1400
94	+}
95	+------------------------------------------