gri3-wm/i3bar/src/outputs.c

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/*
* i3bar - an xcb-based status- and ws-bar for i3
*
* © 2010 Axel Wagner and contributors
*
* See file LICNSE for license information
*
* src/outputs.c: Maintaining the output-list
*
*/
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#include <string.h>
#include <stdlib.h>
#include <stdio.h>
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#include <i3/ipc.h>
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#include <yajl/yajl_parse.h>
#include "common.h"
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/* A datatype to pass through the callbacks to save the state */
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struct outputs_json_params {
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struct outputs_head *outputs;
i3_output *outputs_walk;
char *cur_key;
char *json;
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bool init;
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};
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/*
* Parse a null-value (current_workspace)
*
*/
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static int outputs_null_cb(void *params_) {
struct outputs_json_params *params = (struct outputs_json_params*) params_;
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FREE(params->cur_key);
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return 1;
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}
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/*
* Parse a booleant-value (active)
*
*/
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static int outputs_boolean_cb(void *params_, bool val) {
struct outputs_json_params *params = (struct outputs_json_params*) params_;
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if (strcmp(params->cur_key, "active")) {
return 0;
}
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params->outputs_walk->active = val;
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FREE(params->cur_key);
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return 1;
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}
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/*
* Parse an integer (current_workspace or the rect)
*
*/
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static int outputs_integer_cb(void *params_, long val) {
struct outputs_json_params *params = (struct outputs_json_params*) params_;
if (!strcmp(params->cur_key, "current_workspace")) {
params->outputs_walk->ws = (int) val;
FREE(params->cur_key);
return 1;
}
if (!strcmp(params->cur_key, "x")) {
params->outputs_walk->rect.x = (int) val;
FREE(params->cur_key);
return 1;
}
if (!strcmp(params->cur_key, "y")) {
params->outputs_walk->rect.y = (int) val;
FREE(params->cur_key);
return 1;
}
if (!strcmp(params->cur_key, "width")) {
params->outputs_walk->rect.w = (int) val;
FREE(params->cur_key);
return 1;
}
if (!strcmp(params->cur_key, "height")) {
params->outputs_walk->rect.h = (int) val;
FREE(params->cur_key);
return 1;
}
return 0;
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}
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/*
* Parse a string (name)
*
*/
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static int outputs_string_cb(void *params_, const unsigned char *val, unsigned int len) {
struct outputs_json_params *params = (struct outputs_json_params*) params_;
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if (strcmp(params->cur_key, "name")) {
return 0;
}
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char *name = malloc(sizeof(const unsigned char) * (len + 1));
strncpy(name, (const char*) val, len);
name[len] = '\0';
params->outputs_walk->name = name;
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FREE(params->cur_key);
return 1;
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}
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/*
* We hit the start of a json-map (rect or a new output)
*
*/
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static int outputs_start_map_cb(void *params_) {
struct outputs_json_params *params = (struct outputs_json_params*) params_;
i3_output *new_output = NULL;
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if (params->cur_key == NULL) {
new_output = malloc(sizeof(i3_output));
new_output->name = NULL;
new_output->ws = 0,
memset(&new_output->rect, 0, sizeof(rect));
new_output->bar = XCB_NONE;
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new_output->workspaces = malloc(sizeof(struct ws_head));
TAILQ_INIT(new_output->workspaces);
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params->outputs_walk = new_output;
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return 1;
}
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return 1;
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}
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/*
* We hit the end of a map (rect or a new output)
*
*/
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static int outputs_end_map_cb(void *params_) {
struct outputs_json_params *params = (struct outputs_json_params*) params_;
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/* FIXME: What is at the end of a rect? */
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i3_output *target = get_output_by_name(params->outputs_walk->name);
if (target == NULL) {
SLIST_INSERT_HEAD(outputs, params->outputs_walk, slist);
} else {
target->active = params->outputs_walk->active;
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target->ws = params->outputs_walk->ws;
target->rect = params->outputs_walk->rect;
}
return 1;
}
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/*
* Parse a key.
*
* Essentially we just save it in the parsing-state
*
*/
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static int outputs_map_key_cb(void *params_, const unsigned char *keyVal, unsigned int keyLen) {
struct outputs_json_params *params = (struct outputs_json_params*) params_;
FREE(params->cur_key);
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params->cur_key = malloc(sizeof(unsigned char) * (keyLen + 1));
strncpy(params->cur_key, (const char*) keyVal, keyLen);
params->cur_key[keyLen] = '\0';
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return 1;
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}
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/* A datastructure to pass all these callbacks to yajl */
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yajl_callbacks outputs_callbacks = {
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&outputs_null_cb,
&outputs_boolean_cb,
&outputs_integer_cb,
NULL,
NULL,
&outputs_string_cb,
&outputs_start_map_cb,
&outputs_map_key_cb,
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&outputs_end_map_cb,
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NULL,
NULL
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};
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/*
* Initiate the output-list
*
*/
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void init_outputs() {
outputs = malloc(sizeof(struct outputs_head));
SLIST_INIT(outputs);
}
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/*
* Start parsing the received json-string
*
*/
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void parse_outputs_json(char *json) {
struct outputs_json_params params;
params.outputs_walk = NULL;
params.cur_key = NULL;
params.json = json;
yajl_handle handle;
yajl_parser_config parse_conf = { 0, 0 };
yajl_status state;
handle = yajl_alloc(&outputs_callbacks, &parse_conf, NULL, (void*) &params);
state = yajl_parse(handle, (const unsigned char*) json, strlen(json));
/* FIXME: Propper errorhandling for JSON-parsing */
switch (state) {
case yajl_status_ok:
break;
case yajl_status_client_canceled:
case yajl_status_insufficient_data:
case yajl_status_error:
ELOG("Could not parse outputs-reply!\n");
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exit(EXIT_FAILURE);
break;
}
yajl_free(handle);
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}
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/*
* Returns the output with the given name
*
*/
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i3_output *get_output_by_name(char *name) {
i3_output *walk;
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if (name == NULL) {
return NULL;
}
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SLIST_FOREACH(walk, outputs, slist) {
if (!strcmp(walk->name, name)) {
break;
}
}
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return walk;
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}