first step of the big refactoring ("tree" branch).

From here on, we can track changes. It made no sense to put the
development up to this point into git.

src/load_layout.c

@@ -0,0 +1,160 @@
+#include <yajl/yajl_common.h>
+#include <yajl/yajl_gen.h>
+#include <yajl/yajl_parse.h>
+
+#include "all.h"
+
+/* TODO: refactor the whole parsing thing */
+
+static char *last_key;
+static Con *json_node;
+static bool parsing_swallows;
+static bool parsing_rect;
+struct Match *current_swallow;
+
+static int json_start_map(void *ctx) {
+    LOG("start of map\n");
+    if (parsing_swallows) {
+        LOG("TODO: create new swallow\n");
+        current_swallow = scalloc(sizeof(Match));
+        TAILQ_INSERT_TAIL(&(json_node->swallow_head), current_swallow, matches);
+    } else {
+        if (!parsing_rect)
+            json_node = con_new(json_node);
+    }
+    return 1;
+}
+
+static int json_end_map(void *ctx) {
+    LOG("end of map\n");
+    if (!parsing_swallows && !parsing_rect)
+        json_node = json_node->parent;
+    if (parsing_rect)
+        parsing_rect = false;
+    return 1;
+}
+
+static int json_end_array(void *ctx) {
+    LOG("end of array\n");
+    parsing_swallows = false;
+    return 1;
+}
+
+static int json_key(void *ctx, const unsigned char *val, unsigned int len) {
+    LOG("key: %.*s\n", len, val);
+    FREE(last_key);
+    last_key = scalloc((len+1) * sizeof(char));
+    memcpy(last_key, val, len);
+    if (strcasecmp(last_key, "swallows") == 0) {
+        parsing_swallows = true;
+    }
+    if (strcasecmp(last_key, "rect") == 0)
+        parsing_rect = true;
+    return 1;
+}
+
+static int json_string(void *ctx, const unsigned char *val, unsigned int len) {
+    LOG("string: %.*s for key %s\n", len, val, last_key);
+    if (parsing_swallows) {
+        /* TODO: the other swallowing keys */
+        if (strcasecmp(last_key, "class") == 0) {
+            current_swallow->class = scalloc((len+1) * sizeof(char));
+            memcpy(current_swallow->class, val, len);
+        }
+        LOG("unhandled yet: swallow\n");
+    } else {
+        if (strcasecmp(last_key, "name") == 0) {
+            json_node->name = scalloc((len+1) * sizeof(char));
+            memcpy(json_node->name, val, len);
+        }
+    }
+    return 1;
+}
+
+static int json_int(void *ctx, long val) {
+    LOG("int %d for key %s\n", val, last_key);
+    if (strcasecmp(last_key, "orientation") == 0) {
+        json_node->orientation = val;
+    }
+    if (strcasecmp(last_key, "layout") == 0) {
+        json_node->layout = val;
+    }
+    if (strcasecmp(last_key, "type") == 0) {
+        json_node->type = val;
+    }
+    if (strcasecmp(last_key, "fullscreen_mode") == 0) {
+        json_node->fullscreen_mode = val;
+    }
+
+    if (parsing_rect) {
+        if (strcasecmp(last_key, "x") == 0)
+            json_node->rect.x = val;
+        else if (strcasecmp(last_key, "y") == 0)
+            json_node->rect.y = val;
+        else if (strcasecmp(last_key, "width") == 0)
+            json_node->rect.width = val;
+        else if (strcasecmp(last_key, "height") == 0)
+            json_node->rect.height = val;
+        else printf("WARNING: unknown key %s in rect\n", last_key);
+        printf("rect now: (%d, %d, %d, %d)\n",
+                json_node->rect.x, json_node->rect.y,
+                json_node->rect.width, json_node->rect.height);
+    }
+    if (parsing_swallows) {
+        if (strcasecmp(last_key, "id") == 0) {
+            current_swallow->id = val;
+        }
+    }
+
+    return 1;
+}
+
+static int json_double(void *ctx, double val) {
+    LOG("double %f for key %s\n", val, last_key);
+    if (strcasecmp(last_key, "percent") == 0) {
+        json_node->percent = val;
+    }
+    return 1;
+}
+
+void tree_append_json(const char *filename) {
+    /* TODO: percent of other windows are not correctly fixed at the moment */
+    FILE *f;
+    if ((f = fopen(filename, "r")) == NULL) {
+        LOG("Cannot open file\n");
+        return;
+    }
+    char *buf = malloc(65535); /* TODO */
+    int n = fread(buf, 1, 65535, f);
+    LOG("read %d bytes\n", n);
+    yajl_gen g;
+    yajl_handle hand;
+    yajl_callbacks callbacks;
+    memset(&callbacks, '\0', sizeof(yajl_callbacks));
+    callbacks.yajl_start_map = json_start_map;
+    callbacks.yajl_end_map = json_end_map;
+    callbacks.yajl_end_array = json_end_array;
+    callbacks.yajl_string = json_string;
+    callbacks.yajl_map_key = json_key;
+    callbacks.yajl_integer = json_int;
+    callbacks.yajl_double = json_double;
+    g = yajl_gen_alloc(NULL, NULL);
+    hand = yajl_alloc(&callbacks, NULL, NULL, (void*)g);
+    yajl_status stat;
+    json_node = focused;
+    setlocale(LC_NUMERIC, "C");
+    stat = yajl_parse(hand, (const unsigned char*)buf, n);
+    if (stat != yajl_status_ok &&
+        stat != yajl_status_insufficient_data)
+    {
+        unsigned char * str = yajl_get_error(hand, 1, (const unsigned char*)buf, n);
+        fprintf(stderr, (const char *) str);
+        yajl_free_error(hand, str);
+    }
+
+    setlocale(LC_NUMERIC, "");
+    yajl_parse_complete(hand);
+
+    fclose(f);
+    //con_focus(json_node);
+}