[NEW] Update katex to v0.9.0

[pitamar]

@RocketChat/core

[pitamar]

@rodrigok
Hi, it's been a while since I opened the PR. Is there something missing?
Thanks

[geekgonecrazy]

@pitamar Thanks for the PR. Can you summarize a bit more whats in the update?

Katex is one of those things most of us aren't super familiar with making use of. I think in the past we've actually had to downgrade a few packages of this nature because of performance issues.

[pitamar]

Hi @geekgonecrazy

The currently used version of Katex in RocketChat is 0.7.1.
There has been many updates to the library since though.
I concentrated them here:

v0.8.3 (2017-08-27)

New features:

• Add latin-1 letters as math symbols ([DISCUSSIONS] Should we replace CoffeeScript with ES6? #796)
• Support CJK full-width punctuation + Unicode dots (announce old android devices support and live chat alpha #814)
• Support for ' ` ^ ~ = \u . " \r \H \v text-mode accents (Rename external #802)
• Added support for \not (User references as object #140)

Bug fixes:

• Use inline SVG for stretchy elements (Don't Make Hashtags Which Aren't Channels Clickable #807)
• Improve \sqrt Don't auto-link 10 digit numbers #810

Other changes:

• Modernize font creation (Test issue for @marcel.rocket.team #624)
• Pre-commit hook to call make lint (Allow administrators to send e-mail invitations; #815)
• Fix link in CONTRIBUTING.md.
• Reduce SVG (Bitcoin donations #819)
• switch pre-commit hook to use pre-commit npm package (Display "last seen" information for not online users #823)

v0.8.2 (2017-08-17)

New features:

• Accept all existing Greek letters using unicode characters in math mode (Created and pushed by LingoHub. #410)

Bug fixes:

• Fix MathML output for ' and large operators with limits (How can I update my RocketChat while running in Docker? #788)
• Update package.json to point 'main' at dist/katex.js (Fix error on inviting already joined users, fixes #790 #791)
• Fix color support for stretchy, strikethrough, and fbox (Deactivated Users Show Up on Member List #792)

Other changes:

• Detect attachEvent() support correctly, fixes Change scroll bar in flex-panel #771 (Replace email confirmation alert with proper screen #772)

v0.8.1 (2017-08-11)

The v0.8.0 release did not include the SVG images which are necessary for rendering wide and stretchy accents as well as \overbrace and \underbrace. This release corrects that.

Note that if you're including copies of KaTeX in your web application, you should now include the dist/images directory in addition to the usual the dist/fonts directory.

Many thanks to @spicyj for fixing the issue so quickly.

v0.8.0 (2017-08-11)

Breaking changes:

• Implicit \color, explicitly grouped \textcolor Update README.md #619

New features:

• fix Allow configure login services in settings #509: added some international operators add search bar to channels #647
• Old font command support: \rm, \sf, \tt, \bf, \it Better layout for tabs #675
• Builtin macros, macro arguments, \overset and \underset Allow post to join the channel #605
• Add \iff, \implies, \impliedby support Remove unnecessary space in admin panels + Fix statistic table layout + Fix scrollbar showing just when it's necessary #697
• Support <, >, | and many \text... commands in text mode Selecting Text is disabled on touch screens. #684
• Implement $...$ via styling node Jira support #637
• Support Windows high-contrast mode. Fix Misleading channel list message #716 Protect Uploads - download should not be possible without logging in #724
• Add \jot lineskip to aligned environment, switch contents to displaystyle, and add gathered Stream notify #725
• Fix high contrast mode better, thanks to @GeeLaw Unread #733
• Support stretchy wide elements. silence rocketbot on test #670
• Implement \coloneqq, \colonequals, etc. based on mathtools and colonequals Link Previews not working in all cases #727
• Add configurable error callback Support multiple orgs on the same instance #658
• Support absolute TeX units fix edit msg with older mongodb - closes #731 #732

Other changes:

• Revert "Remove trailing commas for IE 9 compatibility" Auto-completion of #channel name does not disappear if there are no matches #622
• Fix all AMS mathord symbols Initial implementation of search in channel #618
• Fix x'^2 Way to disable emoticons and use only ASCII #636
• Use utils.deflt for Settings Ability for administrators to remove/kick user from group/channel #649
• Fix font typo math -> main no user information on admin #678
• Fix spaces before \middle Force User to Change Password Next Load/Login #689
• Refactor and comment space splicing code changing username by admin #699
• Fix Announce ubuntu and freebsd support #711 issue with multiple superscripts. Added Toggle for auto load image, also bandwidth override to enable on mobile #718
• Fix interaction between styles and sizes. Korean Translation Update ko.i18n.json #719
• Vertically center single-character \mathop. "Edit-feature" for non-administrators #745
• Correct handling of unbraced kerns followed by spaces. Server crashes in development mode when statistics cron job fails #751
• Associate font metrics with Options, not Style. Merge pull request #1 from RocketChat/master #743
• Upgrade the source to use ES6 syntax including classes, import and static properties Redirect user to the defaultRoom if setted #679
• Set maxFontSize on rules. Improve unread behaviour #744
• Correct computation of TeX sizes. Allowing the rejecting/allowing of ssl certs to be configurable by the admin #755
• Use \displaystyle within \over/\underbrace Adding support for private groups reopening and fixing room subscription state #765
• Shrinkwrap vlists in table-like CSS. RocketChat.TabBar #768
• Solve Safari rendering issues with font-size overrides. Image upload preview not complete #780
• Improve rule coding, including for \sqrt. Hide "More private groups" when the user has no private groups. #776

Infra changes:

• Update dependencies to more recent version Customize favicon #612
• Use morgan to log requests in the dev server Add a way to view hidden channels / direct #625
• Improve release script and bower support Admins should be able to delete (and/or) edit other users' mesages #615
• Show compressed sizes correctly MySQL/MariaDB support? #639
• Set up a diff attribute and textconv instructions for font files Backing up development installation data? #635
• Fix release script after experience from 0.7.1 release Custom oauth #642
• Update texcmp to ubuntu 17.04 and avoid mounted host directory Archive (aka freeze) Channels / Groups #722
• Screenshotter: Add --diff and --attempts options. Option to enable/disable auto away and configure timer #736
• Switch from jasmine to jest WordPress integration #747
• Ensure screenshotter runs all tests. Demo Server Times Out #769

Misc:

• Describe using auto renderer in html head Canonical link is hard-coded to https://demo.rocket.chat/ #623
• README.md - added integrity Invite user to room if mention an user that is not in the room #590
• README.md - added integrity Configure Site Name #591
• Switch speed test in README International characters in usernames, rooms etc #640
• Describe site-provided macros in README version 17 migration error #644
• Fixed missing verb in README Improve layout of oembed url and add omebeds to the end of the messag… #668
• Rephrase displayMode description to be clearer Added /invite slash command #648
• Add documentation for how to run auto-render example private group disappeared #740
• Mention texcmp in CONTRIBUTING.md Admin can delete messages (Issue #739) #753

As you can can see most of the changes are bug fixes or addition of new features (like new symbols).
All in all, besides many improvements, it doesn't seem to be a dramatic change.
I didn't feel any slowdown using the new version of Katex. Are there any specific tests you'd like me to perform?

Thanks =)
Itamar

[pitamar]

Is there anything I can do to help?
Do you prefer not to upgrade the katex version? is there a reason to it?

@RocketChat/core

[engelgabriel]

Maybe we should use the version v0.9.0

https://github.com/Khan/KaTeX/releases

[pitamar]

ye, that version was the most recent at the time. if you want i update the pull request for 0.9.0

[engelgabriel]

@pitamar Please do so we can merge it.

[pitamar]

@engelgabriel Ok, I pushed a new commit for version 0.9.0. seems to work fine to me