Greasemonkey script for hg commands on pull requests page...

bb-hg-merge-ui.js

// ==UserScript==
// @name        Bitbucket show merge commandline
// @namespace   http://www.romke.net/static/grease/bb-pull-merge
// @description show merge commandline
// @include     https://bitbucket.org/*/pull-request/*
// @grant       none
// @version     1
// ==/UserScript==

if (! document.getElementsByClassName("conflicts-detected")[0].classList.contains("conflicts") &&
  document.getElementsByClassName("merge-commands").length > 0) {

  var edit = document.getElementById("edit-pullrequest");
  var nbut = document.createElement("a");

  nbut.setAttribute("id", "hg-commands");
  nbut.setAttribute("class", "aui-button aui-style");
  nbut.setAttribute("href", "#");
  nbut.innerHTML = "<span>hg</span>"

  document.getElementsByClassName("compare-widget-container")[0].style.width = 'auto';
  edit.parentNode.insertBefore(nbut, edit);


  document.getElementById('hg-commands').onclick = function() {
    var merge_commands = document.getElementsByClassName("merge-commands")[0];
    if (merge_commands.parentNode.tagName == 'HEADER') {
      merge_commands.style.margin = 'auto';
      document.getElementsByClassName("conflicts-detected")[0].appendChild(merge_commands);
    } else {
      merge_commands.style.margin = '20px';
      document.getElementById("pull-request-header").appendChild(merge_commands);
    }
  };

}