All Paths Lead to Roam

bulletpaths.js

/*
 * credit to Dhrumil Shah (@wandcrafting) and Robert Haisfield (@RobertHaisfield)
 * for the original concept which was part of their RoamGames submission
 * and can be found at: https://www.figma.com/file/5shwLdUCHxSaPNEO7pazbe/
 *
 */

/* ======= OPTIONS ======== */
/* note: if you change these, reload the page to see the effect */

// BULLET
let scale = 2;
let bulletColor = '#FF0099';

// LINES
let showLines = true;
let lineWidth = 2;
let lineColor = bulletColor;
let borderRadius = 5;

// HIGHLIGHT REFS
let highlightRefs = true;
let refColor = bulletColor;

/* ======= LIBRARIES ======== */

/*
 * arrive.js
 * v2.4.1
 * https://github.com/uzairfarooq/arrive
 * MIT licensed
 *
 * Copyright (c) 2014-2017 Uzair Farooq
 */

var Arrive=function(e,t,n){"use strict";function r(e,t,n){l.addMethod(t,n,e.unbindEvent),l.addMethod(t,n,e.unbindEventWithSelectorOrCallback),l.addMethod(t,n,e.unbindEventWithSelectorAndCallback)}function i(e){e.arrive=f.bindEvent,r(f,e,"unbindArrive"),e.leave=d.bindEvent,r(d,e,"unbindLeave")}if(e.MutationObserver&&"undefined"!=typeof HTMLElement){var o=0,l=function(){var t=HTMLElement.prototype.matches||HTMLElement.prototype.webkitMatchesSelector||HTMLElement.prototype.mozMatchesSelector||HTMLElement.prototype.msMatchesSelector;return{matchesSelector:function(e,n){return e instanceof HTMLElement&&t.call(e,n)},addMethod:function(e,t,r){var i=e[t];e[t]=function(){return r.length==arguments.length?r.apply(this,arguments):"function"==typeof i?i.apply(this,arguments):n}},callCallbacks:function(e,t){t&&t.options.onceOnly&&1==t.firedElems.length&&(e=[e[0]]);for(var n,r=0;n=e[r];r++)n&&n.callback&&n.callback.call(n.elem,n.elem);t&&t.options.onceOnly&&1==t.firedElems.length&&t.me.unbindEventWithSelectorAndCallback.call(t.target,t.selector,t.callback)},checkChildNodesRecursively:function(e,t,n,r){for(var i,o=0;i=e[o];o++)n(i,t,r)&&r.push({callback:t.callback,elem:i}),i.childNodes.length>0&&l.checkChildNodesRecursively(i.childNodes,t,n,r)},mergeArrays:function(e,t){var n,r={};for(n in e)e.hasOwnProperty(n)&&(r[n]=e[n]);for(n in t)t.hasOwnProperty(n)&&(r[n]=t[n]);return r},toElementsArray:function(t){return n===t||"number"==typeof t.length&&t!==e||(t=[t]),t}}}(),c=function(){var e=function(){this._eventsBucket=[],this._beforeAdding=null,this._beforeRemoving=null};return e.prototype.addEvent=function(e,t,n,r){var i={target:e,selector:t,options:n,callback:r,firedElems:[]};return this._beforeAdding&&this._beforeAdding(i),this._eventsBucket.push(i),i},e.prototype.removeEvent=function(e){for(var t,n=this._eventsBucket.length-1;t=this._eventsBucket[n];n--)if(e(t)){this._beforeRemoving&&this._beforeRemoving(t);var r=this._eventsBucket.splice(n,1);r&&r.length&&(r[0].callback=null)}},e.prototype.beforeAdding=function(e){this._beforeAdding=e},e.prototype.beforeRemoving=function(e){this._beforeRemoving=e},e}(),a=function(t,r){var i=new c,o=this,a={fireOnAttributesModification:!1};return i.beforeAdding(function(n){var i,l=n.target;(l===e.document||l===e)&&(l=document.getElementsByTagName("html")[0]),i=new MutationObserver(function(e){r.call(this,e,n)});var c=t(n.options);i.observe(l,c),n.observer=i,n.me=o}),i.beforeRemoving(function(e){e.observer.disconnect()}),this.bindEvent=function(e,t,n){t=l.mergeArrays(a,t);for(var r=l.toElementsArray(this),o=0;o<r.length;o++)i.addEvent(r[o],e,t,n)},this.unbindEvent=function(){var e=l.toElementsArray(this);i.removeEvent(function(t){for(var r=0;r<e.length;r++)if(this===n||t.target===e[r])return!0;return!1})},this.unbindEventWithSelectorOrCallback=function(e){var t,r=l.toElementsArray(this),o=e;t="function"==typeof e?function(e){for(var t=0;t<r.length;t++)if((this===n||e.target===r[t])&&e.callback===o)return!0;return!1}:function(t){for(var i=0;i<r.length;i++)if((this===n||t.target===r[i])&&t.selector===e)return!0;return!1},i.removeEvent(t)},this.unbindEventWithSelectorAndCallback=function(e,t){var r=l.toElementsArray(this);i.removeEvent(function(i){for(var o=0;o<r.length;o++)if((this===n||i.target===r[o])&&i.selector===e&&i.callback===t)return!0;return!1})},this},s=function(){function e(e){var t={attributes:!1,childList:!0,subtree:!0};return e.fireOnAttributesModification&&(t.attributes=!0),t}function t(e,t){e.forEach(function(e){var n=e.addedNodes,i=e.target,o=[];null!==n&&n.length>0?l.checkChildNodesRecursively(n,t,r,o):"attributes"===e.type&&r(i,t,o)&&o.push({callback:t.callback,elem:i}),l.callCallbacks(o,t)})}function r(e,t){return l.matchesSelector(e,t.selector)&&(e._id===n&&(e._id=o++),-1==t.firedElems.indexOf(e._id))?(t.firedElems.push(e._id),!0):!1}var i={fireOnAttributesModification:!1,onceOnly:!1,existing:!1};f=new a(e,t);var c=f.bindEvent;return f.bindEvent=function(e,t,r){n===r?(r=t,t=i):t=l.mergeArrays(i,t);var o=l.toElementsArray(this);if(t.existing){for(var a=[],s=0;s<o.length;s++)for(var u=o[s].querySelectorAll(e),f=0;f<u.length;f++)a.push({callback:r,elem:u[f]});if(t.onceOnly&&a.length)return r.call(a[0].elem,a[0].elem);setTimeout(l.callCallbacks,1,a)}c.call(this,e,t,r)},f},u=function(){function e(){var e={childList:!0,subtree:!0};return e}function t(e,t){e.forEach(function(e){var n=e.removedNodes,i=[];null!==n&&n.length>0&&l.checkChildNodesRecursively(n,t,r,i),l.callCallbacks(i,t)})}function r(e,t){return l.matchesSelector(e,t.selector)}var i={};d=new a(e,t);var o=d.bindEvent;return d.bindEvent=function(e,t,r){n===r?(r=t,t=i):t=l.mergeArrays(i,t),o.call(this,e,t,r)},d},f=new s,d=new u;t&&i(t.fn),i(HTMLElement.prototype),i(NodeList.prototype),i(HTMLCollection.prototype),i(HTMLDocument.prototype),i(Window.prototype);var h={};return r(f,h,"unbindAllArrive"),r(d,h,"unbindAllLeave"),h}}(window,"undefined"==typeof jQuery?null:jQuery,void 0);

/* ======= CODE ======== */

// Add custom style tag to document for CSS customization
let style = document.createElement('style');
let baseStyle = `
.path-highlighted .rm-bullet .rm-bullet__inner,
.path-highlighted .rm-bullet .rm-bullet__inner--user-icon {
    background-color: ${bulletColor} !important;
    transform: scale(${scale});
}
`
if(highlightRefs) {
  baseStyle += `
.path-highlighted + .roam-block .rm-page-ref,
.path-highlighted + .roam-block .rm-alias {
	color: ${refColor};
}
.path-highlighted + .roam-block .rm-block-ref {
	border-bottom-color: ${refColor};
}
`
}
style.textContent = baseStyle
document.body.appendChild(style);

// Remove classes when block is unfocused
document.leave('textarea.rm-block-input', function(el) {
    let bullets = [].slice.call(document.querySelectorAll('.path-highlighted'));

    bullets.forEach(function(bullet) {
        bullet.classList.remove('path-highlighted');
    })
})

// Show highlighted bullets + path when block is focused
let pathid = 0;
document.arrive('textarea.rm-block-input', function(el) {
    let bullets = [];
    let block = el.closest('.roam-block-container');
    // iterate through parents and get bullet elements
    while(block) {
        bullets.push(block.querySelector('.controls'));
        block = block.parentElement.closest('.roam-block-container')
    }
    
    // bullet styles cannot be applied directly to the element because they are pseudotags
    // so we'll create a style string and add it to the style tag we created earlier
    let bulletStyle = ''
    bullets.forEach(function(bullet, i) {
        let lastBullet = i > 0 ? bullets[i-1] : null
        // give each bullet a special path identifier so that we can target it directly
        if(!bullet.dataset.pathidentifier) { bullet.dataset.pathidentifier = pathid++ }
        
        if(lastBullet != null && showLines == true) {
            let bboxA = lastBullet.getBoundingClientRect()
            let bboxB = bullet.getBoundingClientRect()

            bulletStyle += `
.path-highlighted[data-pathidentifier="${bullet.dataset.pathidentifier}"] .bp3-popover-target::before {
    content: "";
    position: absolute;
    top: 10px; left: 6px;
    width: ${bboxA.x-bboxB.x}px; height: ${bboxA.y-bboxB.y}px;
    border: ${lineWidth}px solid ${lineColor};
    border-right: none;
    border-top: none;
    border-bottom-left-radius: ${borderRadius}px;
    pointer-events: none;
    z-index: 11 !important;
}
`
        }
        
        // highlight bullet
        bullet.classList.add('path-highlighted')
    })
    
    // set content of style tag to include both the base styles from before and the bullet styles we just generated
    style.textContent = baseStyle + bulletStyle;
})

this is so beautiful, thank u!