Slack common keyboard shortcuts

Augment.js

$(function() {
  
  alert("Initializing additional Slack keyboard shortcuts.\n\nCTRL+B = bold\nCTRL+I = italic\nCTRL+S = strike through\nCTRL+P = preformatted\nCTRL+< = code");
  
  var keys = {
    b: "*",
    i: "_",
    "<": "`",
    p: "\n```\n",
    s : "~"
  };
  
  $("#msg_input")
    .off(".slack")
    .on("keyup.slack", function(evt) {
      if (!keys[evt.key]) return;
      if (!evt.ctrlKey) return;
      evt.preventDefault();
      var head = this.selectionStart;
      var tail = this.selectionEnd;
      var left = this.value.substr(0, this.selectionStart);
      var mid = this.value.substring(this.selectionStart, this.selectionEnd);
      var right = this.value.substr(this.selectionEnd);
      this.value = left + keys[evt.key] + mid + keys[evt.key] + right;
      var shift = keys[evt.key].length;
      this.selectionEnd = tail + shift;
      this.selectionStart = head + shift;
      $(this).trigger("input");
    })
    .on("keydown.slack", function(evt){
      if (evt.ctrlKey && (evt.key === "s" || evt.key === "p")) {
        evt.preventDefault();
        evt.stopPropagation();
      }
      if (evt.shiftKey && evt.ctrlKey && evt.key === "?") {
        evt.preventDefault();
        evt.stopPropagation();
        alert("Additional Slack keyboard shortcuts are enabled.\n\nCTRL+B = bold\nCTRL+I = italic\nCTRL+S = strike through\nCTRL+P = preformatted\nCTRL+< = code");
      }
    });
  });

void(0);