Use commentDepth options in Follow Comments keyboard navigation

lib/modules/keyboardNav.js

@@ -1,17 +1,20 @@
 /* @flow */
 
 import $ from 'jquery';
-import { once, maxBy, without, memoize } from 'lodash-es';
+import { maxBy, memoize, once, without } from 'lodash-es';
 import { Module } from '../core/module';
 import * as Modules from '../core/modules';
+import * as Options from '../core/options';
+import { i18n, openNewTab } from '../environment';
 import {
 	NAMED_KEYS,
-	Thing,
 	SelectedThing,
+	Thing,
 	click,
-	downcast,
 	currentSubreddit,
 	currentUserProfile,
+	downcast,
+	execRegexes,
 	filterMap,
 	getPercentageVisibleYAxis,
 	hashKeyArray,
@@ -22,21 +25,21 @@ import {
 	loggedInUser,
 	matchesPageLocation,
 	niceKeyCode,
+	regexes,
 	scrollToElement,
 	string,
-	watchForElements,
 	waitForEvent,
+	watchForElements,
 } from '../utils';
-import { i18n, openNewTab } from '../environment';
-import * as Options from '../core/options';
 import * as CommandLine from './commandLine';
+import * as CommentDepth from './commentDepth';
 import * as CommentNavigator from './commentNavigator';
 import * as EasterEgg from './easterEgg';
 import * as FilteReddit from './filteReddit';
 import * as HideChildComments from './hideChildComments';
 import * as NeverEndingReddit from './neverEndingReddit';
-import * as Notifications from './notifications';
 import * as NoParticipation from './noParticipation';
+import * as Notifications from './notifications';
 import * as SaveComments from './saveComments';
 import * as SettingsNavigation from './settingsNavigation';
 import * as ShowImages from './showImages';
@@ -1201,7 +1204,41 @@ function followPermalink(newWindow = false) {
 
 function followComments(newWindow = false, selected = getSelected()) {
 	const a = assertElement(selected.getCommentsLink());
-	navigateTo(a.href, { newWindow });
+	const url = new URL(a.href, location.href);
+
+	// no need to proceed if depth already exists in the query string
+	if (url.searchParams.has('depth')) {
+		navigateTo(a.href, { newWindow });
+	}
+
+	if (regexes.commentPermalink.test(url.pathname) && (
+		!CommentDepth.module.options.commentPermalinks.value ||
+		!CommentDepth.module.options.commentPermalinksContext.value && url.searchParams.has('context')
+	)) {
+		navigateTo(a.href, { newWindow });
+	}
+
+	const matches = execRegexes.comments(url.pathname);
+	if (!matches) navigateTo(a.href, { newWindow });
+
+	// check for subreddit specific values
+	const subreddit = matches && matches[1].toLowerCase();
+	const [, commentDepth, minimumComments] = (
+		CommentDepth.module.options.subredditCommentDepths.value.find(([subreddits]) => subreddits.toLowerCase().split(',').includes(subreddit)) ||
+		[null, CommentDepth.module.options.defaultCommentDepth.value, CommentDepth.module.options.defaultMinimumComments.value]
+	);
+
+	// NaN or 0 (show everything)
+	if (!parseInt(commentDepth, 10)) navigateTo(a.href, { newWindow });
+
+	// if the comment count is less than the minimum, show everything
+	const minimumCount = parseInt(minimumComments, 10);
+	if (minimumCount && selected && selected.isPost() && (selected.getCommentCount() || 0) < minimumCount) {
+		navigateTo(a.href, { newWindow });
+	}
+
+	url.searchParams.set('depth', commentDepth);
+	navigateTo(url.href, { newWindow });
 }
 
 function vote(way: 'downmod' | 'upmod', preventToggle = false, selected = getSelected()) {

locales/locales/en.json

@@ -217,7 +217,7 @@
 		"message": "Custom Comment Depth"
 	},
 	"commentDepthDesc": {
-		"message": "Allows you to set the preferred depth of comments you wish to see when clicking on comments links.\n\n0 = Everything, 1 = Root level, 2 = Responses to root level, 3 = Responses to responses to root level, etc."
+		"message": "Allows you to set the preferred depth of comments you wish to see when clicking on comments links or navigate using the Follow Comments keyboard shortcut.\n\n0 = Everything, 1 = Root level, 2 = Responses to root level, 3 = Responses to responses to root level, etc."
 	},
 	"commentHidePerName": {
 		"message": "Comment Hide Persistor"