Object.mixin = function (target, source) {
  if (typeof source != "object") return target;
  Object.defineProperties(target, Object.getOwnPropertyDescriptors(source));
  return target;
};

Object.defineProperty(Object.prototype, "mixin", {
  value: function mixin(obj) {
    if (typeof obj == "string") obj = use(obj);
    if (obj) Object.mixin(this, obj);
  },
});

/* STRING DEFS */
Object.defineProperty(String.prototype, "rm", {
  value: function (index, endidx = index + 1) {
    return this.slice(0, index) + this.slice(endidx);
  },
});

Object.defineProperty(String.prototype, "tolast", {
  value: function (val) {
    var idx = this.lastIndexOf(val);
    if (idx == -1) return this.slice();
    return this.slice(0, idx);
  },
});


Object.defineProperty(String.prototype, "dir", {
  value: function () {
    if (!this.includes("/")) return "";
    return this.tolast("/");
  },
});


Object.defineProperty(String.prototype, "next", {
  value: function (char, from) {
    if (!Array.isArray(char)) char = [char];
    if (from > this.length - 1) return -1;
    else if (!from) from = 0;

    var find = this.slice(from).search(char[0]);
    if (find == -1) return -1;
    else return from + find;

    var i = 0;
    var c = this.charAt(from + i);
    while (!char.includes(c)) {
      i++;
      if (from + i > this.length - 1) return -1;
      c = this.charAt(from + i);
    }
    return from + i;
  },
});


Object.defineProperty(String.prototype, "prev", {
  value: function (char, from, count = 0) {
    if (from > this.length - 1) return -1;
    else if (!from) from = this.length - 1;

    var find = this.slice(0, from).lastIndexOf(char);

    while (count > 1) {
      find = this.slice(0, find).lastIndexOf(char);
      count--;
    }

    if (find == -1) return 0;
    else return find;
  },
});


Object.defineProperty(String.prototype, "strip_ext", {
  value: function () {
    return this.tolast(".");
  },
});


Object.defineProperty(String.prototype, "ext", {
  value: function () {
    return this.fromlast(".");
  },
});


Object.defineProperty(String.prototype, "up_path", {
  value: function () {
    var base = this.base();
    var dirs = this.dir().split("/");
    dirs.pop();
    return dirs.join("/") + base;
  },
});


Object.defineProperty(String.prototype, "fromlast", {
  value: function (val) {
    var idx = this.lastIndexOf(val);
    if (idx == -1) return "";
    return this.slice(idx + 1);
  },
});


Object.defineProperty(String.prototype, "tofirst", {
  value: function (val) {
    var idx = this.indexOf(val);
    if (idx == -1) return this.slice();
    return this.slice(0, idx);
  },
});


Object.defineProperty(String.prototype, "fromfirst", {
  value: function (val) {
    var idx = this.indexOf(val);
    if (idx == -1) return this;
    return this.slice(idx + val.length);
  },
});


Object.defineProperty(String.prototype, "name", {
  value: function () {
    var idx = this.indexOf("/");
    if (idx == -1) return this.tolast(".");
    return this.fromlast("/").tolast(".");
  },
});


Object.defineProperty(String.prototype, "set_name", {
  value: function (name) {
    var dir = this.dir();
    return this.dir() + "/" + name + "." + this.ext();
  },
});


Object.defineProperty(String.prototype, "base", {
  value: function () {
    return this.fromlast("/");
  },
});


Object.defineProperty(String.prototype, "updir", {
  value: function () {
    if (this.lastIndexOf("/") == this.length - 1) return this.slice(0, this.length - 1);
    var dir = (this + "/").dir();
    return dir.dir();
  },
});


/* ARRAY DEFS */
Object.defineProperty(Array.prototype, "filter!", {
  value: function array_dofilter(fn) {
    for (let i = 0; i < this.length; i++) {
      if (!fn.call(this, this[i], i, this)) {
        this.splice(i, 1);
        i--;
      }
    }
    return this;
  },
});


Object.defineProperty(Array.prototype, "delete", {
  value: function(item) {
    var idx = this.indexOf(item);
    if (idx > -1) this.splice(idx,1);
    return null;
  }
});


Object.defineProperty(Array.prototype, "copy", {
  value: function () {
    var c = [];
    this.forEach(function (x, i) {
      c[i] = deep_copy(x);
    });
    return c;
  },
});


Object.defineProperty(Array.prototype, "equal", {
  value: function equal(b) {
    if (this.length != b.length) return false;
    if (b == null) return false;
    if (this == b) return true;
    return JSON.stringify(this) == JSON.stringify(b);

    for (var i = 0; i < this.length; i++) {
      if (!this[i] == b[i]) return false;
    }
    return true;
  },
});


Object.defineProperty(Array.prototype, "last", {
  value: function () {
    return this[this.length - 1];
  },
});


Object.defineProperty(Array.prototype, "wrapped", {
  value: function (x) {
    var c = this.slice(0, this.length);
    for (var i = 0; i < x; i++) c.push(this[i]);
    return c;
  },
});


Object.defineProperty(Array.prototype, "wrap_idx", {
  value: function (x) {
    while (x >= this.length) {
      x -= this.length;
    }
    return x;
  },
});


Object.defineProperty(Array.prototype, "mirrored", {
  value: function (x) {
    var c = this.slice(0);
    if (c.length <= 1) return c;
    for (var i = c.length - 2; i >= 0; i--) c.push(c[i]);
    return c;
  },
});