Our webinars are continuing to be as popular as ever and
Tom Sydney Kerckhove's (Tech Lead at FP Complete) webinar on
"Building Terminal User Interfaces with Haskell" was no exception.
We had 426 people registered for the event which aired on
Wednesday, November 28th at 10:00 am PST. If you tuned in live you
would have seen Tom Sydney Kerckhove programming at lightning
speeds. We are so glad we recorded the event because you need to be
able to stop and start the video at your own pace to keep up with
the action. IMPORTANT
NOTE: Before you watch the video you may want to
check out the Free Training offer we are making available to the
first 20 people who register. You can find out more below or by
clicking here to register now
In this month's webinar, Tom Sydney Kerckhove will
demonstrate just how easy it is to get started with Terminal User
Interfaces (TUIs). As a recap, TUIs are text-based user
interfaces for use from a terminal. They are usually lightweight,
and most importantly, in this webinar, you will learn how easy they
are to use. You will also learn how to get up and running by making
your own TUI applications with live-coding example TUIs with the
Topics to be covered:
- The Brick architecture
- Basic cursors
- Simple example TUI applications
We decided to include the chat log for this webinar, and it can
be seen at the end of this blog post. For those of you that want
more information the TUI Syd built check out the following
A base to start a TUI from: https://github.com/NorfairKing/tui-base
A semantic tree-based editor to replace Emacs Org Mode for
A declarative terminal UI programming library written in
At FP Complete, we do so many things to help companies it's hard to
encapsulate our impact in a few words. They say a picture is
worth a thousand words, so a video has to be worth 10,000 words (at
least). Therefore, to tell all we can in as little time as
possible, we recently produced a new explainer video. Check it out
by clicking the video link below. It's only 108 seconds to get the
full story of FP Complete. One last thing. We have a home page a
facelift, and you can check it out here.
Check out our new Explainer Video
We want your feedback for webinar topics
We would like to hear your suggestions for future webinar
topics. The simplest way to accomplish this is to add a
comment to this blog post with your suggestion. Alternatively, send
your suggestion via email to email@example.com.
Webinar Chat Log
We find it useful to share what was chatted about during the
webinar. You can see the chat flow below.
10:00:38 From oren rozen : Hi
10:00:48 From Michael Snoyman : Welcome everyone
10:00:51 From Alexandre Garcia de Oliveira : Hi
10:00:57 From Nick Linker to All panelists : Hi!
10:01:00 From Andre Artus to All panelists : hi
10:01:21 From oren rozen : my first webinar so guide me if I need
to do something special
10:01:22 From Andrey Prokopenko : Hi everybody!
10:01:34 From Tristian Azuara : Hello!
10:01:37 From Frank Stüss to All panelists : hi everyone!
10:01:40 From Artem Chernyak : Hi!
10:01:40 From bogdan : Hi!
10:01:41 From Dan Banta : Hello. :)
10:01:44 From furnost to All panelists : Hello
10:01:45 From Joerg W to All panelists : Hi!
10:01:46 From Alexei Pastuchov to All panelists : Hi
10:02:09 From Frank Stüss to All panelists : thanks for doing
10:02:19 From Pedro Furlanetto : Hello
10:02:32 From furnost to All panelists : Hi all!
10:02:33 From Andrew Starodubtsev to All panelists : hello!
10:02:40 From Daniel Leones to All panelists : Hello.
10:03:06 From Michael Snoyman : Feel free to ask questions here,
I'll try to either respond or pass them along :)
10:03:50 From Pedro Furlanetto : Curses?
10:03:58 From Pedro Furlanetto : * Library I mean
10:04:12 From Michael Snoyman : I'm not sure what the question is,
10:04:29 From R Primus : Is it using the nurses library?
10:04:45 From Michael Snoyman : Under the surface, yes, though
we'll get into the libraries
10:04:51 From Pedro Furlanetto : curses and lcurses library for
Unix terminal UIs
10:04:52 From Michael Snoyman :
10:05:03 From oren rozen : Is it possible to run it with nix?
10:05:21 From Michael Snoyman : I believe so, though I haven't
tested it myself in this case
10:05:46 From Tristian Azuara : Hi I might have to leave the
webinar; for a work call; will the recording be available
10:05:54 From Niklas Hambuechen to All panelists : It uses vty , a
competitor to ncurses : https://hackage.haskell.org/package/vty
10:06:16 From Michael Snoyman : Yes, we'll make the recording
available when ready (probably in the next few days)
10:06:19 From Niklas Hambuechen to All panelists : See the
dependencies of https://hackage.haskell.org/package/brick
10:06:35 From Michael Snoyman : And announce on our blog and
10:06:41 From Michael Snoyman : Niklas: thanks for the
10:06:43 From Tristian Azuara : Awesome!!, thank you; I’ll stay for
as long as possible.
10:06:59 From furnost to All panelists : Awesome, thanks for the
10:07:56 From Alexandre Garcia de Oliveira : Widget is a dependent
10:07:59 From Alexandre Garcia de Oliveira : is
10:08:19 From Corey O'Connor to All panelists : ( a R Primus to be
clear - The " ncurses " UI widgets are not used. ncurses is only
used for loading termcap data. )
10:08:46 From Alexandre Garcia de Oliveira : Ok. Thank you
10:08:58 From Michael Snoyman : +1
10:09:08 From Michael Snoyman :
10:09:12 From Pedro Furlanetto : Are the slides a brick app?
10:09:30 From Robert Pearce : ^ +1
10:09:33 From Konstantin Yegorov to All panelists :
Downloaded lts -12.18 build plan.
AesonException "Error in $.packages.cassava.constraints.flags:
failed to parse field packages: failed to parse field constraints:
failed to parse f
ield flags: Invalid flag name: \"bytestring--lt-0_10_4\""
10:09:42 From Michael Snoyman : You need to upgrade Stack, try
10:09:50 From Konstantin Yegorov to All panelists : 10x
10:10:10 From Michael Snoyman : I'll save the slides question to
10:10:41 From Niklas Hambüchen to All panelists : oren rozen: The
example is a simple Haskell package, so like all other packages, it
work with nix as well.
10:11:24 From Niklas Hambüchen to All panelists : *works
10:11:33 From Alexandre Garcia de Oliveira : Nope
10:11:40 From furnost to All panelists : Fine by me
10:11:41 From oren rozen : Go ahead
10:11:52 From Nick Linker to All panelists : clear
10:15:43 From Andrey Prokopenko : please move on
10:15:47 From Pedro Furlanetto : can you please, write the type
vBox in a comment in the source
10:15:50 From Nick Linker : its ok
10:16:13 From Andre Artus : I'm battling to watch and follow along
at the same time.
10:16:17 From Michael Snoyman :
10:16:51 From Michael Snoyman : Andre: if you're having trouble,
keep in mind that the video will also be recorded if you'd like to
try going through it with a pause button later
10:17:34 From Andre Artus : Thanks, Michael, I will just watch it
now and follow through it later.
10:18:12 From Pedro Furlanetto : Cursor == Zipper?
10:18:18 From Michael Snoyman : Yes
10:18:21 From Alexandre Garcia de Oliveira : Yes
10:18:28 From Pedro Furlanetto : thx
10:18:49 From Nick Linker : Why do we need nonEmptySelectNext/Prev
functions and not just fields of NonEmptyCursor data type?
10:19:37 From Michael Snoyman : We would need to tie the knot in a
funny way to make that happen. If you try to implement such a
field-based approach, you'll see the problem
10:20:59 From Nick Linker : Hm, ok.
10:22:39 From Nick Linker : What the signature of `continue`
10:22:46 From Michael Snoyman : One sec
10:22:56 From Nick Linker : a -> EventM a?
10:23:08 From Michael Snoyman : Almost
10:23:14 From Michael Snoyman : continue :: s -> EventM n (Next
10:23:15 From Nick Linker : Thanks!
10:23:23 From Nick Linker : I see.
10:23:38 From Michael Snoyman : In case anyone's curious, I'm using
the Stackage search on this page:
10:23:51 From Nick Linker : Thanks, Michael.
10:25:53 From Corey O'Connor to All panelists : true that @ boolean
10:26:17 From furnost to All panelists : everything clear
10:26:19 From Andre Artus : good so far
10:26:50 From Michael Snoyman : wehavetogodeeper.gif
10:27:01 From Nick Linker : haha
10:29:54 From Alexandre Garcia de Oliveira : Go ahead
10:30:00 From Nick Linker : cool, no question so far
10:30:39 From Pedro Furlanetto : That’s cool
10:30:49 From Niklas Hambüchen : I can't see vty or patat in the
deps of patat
10:30:58 From Niklas Hambüchen : sorry "vty or brick"
10:31:18 From Pedro Furlanetto : Let’s dive deeper
10:31:40 From Daniel Leones to All panelists : I think you're using
vim. Does Haskell autocompletion is included?
10:31:49 From Robert Pearce : Thanks! gotta bounce. looking forward
to the video. This is great <3
10:32:32 From Corey O'Connor to All panelists : (probably a vty bug
10:32:35 From Andrey Prokopenko : cool
10:32:35 From Alexandre Garcia de Oliveira : This is cooler than
10:32:39 From bogdan : Hi, can you make a small overview of
10:32:42 From bogdan : ?
10:32:47 From Bulent Basaran : How easy would it be to draw
10:32:52 From Karol Kopiec to All panelists : thx really cool
10:34:08 From Corey O'Connor to All panelists : I would akin brick
to a UI toolkit. Like GTK or QT.
10:34:15 From Peter Young : Thanks for presentation. Very cool!
10:34:18 From bogdan : Ok, thank you)
10:34:21 From oren rozen : thank you
10:34:24 From oren rozen : :)
10:34:30 From Andre Artus : Are there higher level UI elements?
I.e. composing a from without having to construct everything?
10:34:39 From furnost to All panelists : thanks! amazed at the dev
10:34:46 From Daniel Leones to All panelists : Thanks for the
10:34:59 From Bulent Basaran : in emacs/shell mode: I am getting an
error: tui: user error (Terminal does not define required
10:35:17 From Corey O'Connor to All panelists : "composing a form"?
As in, handling the user interaction and data submission?
10:35:30 From Michael Snoyman : I don't think we'll be able to
debug the emacs shell mode support, sorry
10:35:48 From Bulent Basaran : no problem :-)
10:36:08 From Mo Kweon : will the code be available after this?
10:36:38 From Daniel Leones to All panelists : This:
10:36:42 From Pedro Furlanetto : Update the attributes map
10:37:11 From Michael Snoyman : Good call Pedro :)
10:37:18 From Michael Snoyman : I was about to mention it
10:37:23 From Michael Snoyman : But Syd got there first
10:38:02 From oren rozen : Both the selection is red and the file
10:38:42 From Pedro Furlanetto : making selected the last?
10:38:45 From Marc Paterno : I am accustomed to using test-driven
development,. What Haskell tool or library would you suggest for
10:38:45 From Iurii Lukaniuk to All panelists : Can we send events
to Brick app from another thread?
For example, events about changes of directory contents
10:38:49 From Pedro Furlanetto : (pure guessing)
10:39:08 From Alexandre Garcia de Oliveira : nice
10:39:10 From bogdan : Question is of topic: what extensions are
used for vim? or neovim ? (you can not answer for this
10:39:12 From Corey O'Connor to All panelists : cool!
10:39:13 From Frank Stüss to All panelists : (y)
10:39:13 From Pedro Furlanetto : yep
10:39:13 From SORIN STOICESCU to All panelists : Hi, could you
share some thoughts about structuring Brick as an interface to
something multithreaded/async? like, imagine you select a file &
the program uploads it somewhere, in the background, showing some
progress bar for it
10:39:16 From Bulent Basaran : beautiful!
10:39:49 From bogdan : * is out of topic
10:39:52 From Andre Artus : Cool
10:40:28 From Artem Chernyak : Brick reminds me a lot of the Redux
10:40:35 From Artem Chernyak : From JS
10:41:53 From Pedro Furlanetto : is the draw always of the entire
screen or is it able to update only certain portions?
10:41:53 From Nick Linker : Or ELM, but with some additional type
10:42:01 From Pedro Furlanetto : *screen ~= terminal
10:42:08 From bogdan : Can I have like deadlocks with channels?
10:42:23 From Mo Kweon : Where is the code available?
10:42:39 From Pedro Furlanetto : The link is in the beginning of
10:42:41 From Michael Snoyman : We'll send out an email with code
and video links
10:42:48 From Daniel Leones to All panelists : Nice.
10:43:13 From Marc Paterno : I am accustomed to using test-driven
development ,. What Haskell tool or library would you suggest for
10:43:16 From bogdan : Thanks for answering)
10:43:27 From Nick Linker : Let me some more side questions:
Could you describe your workspace environment. I guess this is zsh
with oh-my- zsh installed, but is there something beyound this?
How do you make immediate stack build on save?
How do you make fast reformatting of the last entered piece of
How do you configured type hints?
10:43:29 From Jon Schoning to All panelists : Do you ever embed a
brick App into a higher level component in your application? or
just use the App directly?
10:43:53 From Jon Schoning to All panelists : i.e. Brick does not
seem like a Monad Transformer itself
10:44:22 From Marc Paterno : Thanks
10:45:41 From Pedro Furlanetto : xmonad is going on, no?
10:46:02 From Karl Berger to All panelists : There was a good
webinar previously on Haskell workflow, would recommend!
10:46:06 From Mo Kweon : looks like it
10:46:44 From Nick Linker : Thank you for the answers!
10:46:46 From Mo Kweon : yeah
10:46:48 From oren rozen : this is a tooling question as well: just
wonder did you guys have tried haskell -ide-engine
10:47:07 From oren rozen : Ok thanks
10:47:08 From furnost to All panelists : +1 for webinar idea
10:47:12 From Artem Chernyak : Thank you so much this was a great
demo and walkthrough!
10:47:15 From bogdan : Wonderful presentation)
10:47:16 From LUC DUZAN to All panelists : What is the biggest TUI
you have written so far ?
10:47:17 From Mo Kweon : Thank you
10:47:18 From furnost to All panelists : thanks !
10:47:19 From Frank Stüss to All panelists : super! thank you
10:47:21 From Andre Artus : Thanks, very informative
10:47:23 From Daniel Leones to All panelists : Thank you
10:47:24 From Michael Irving : Thank you
10:47:26 From SORIN STOICESCU to All panelists : Thank you
10:47:28 From Karl Berger to All panelists : Thanks everyone
10:47:29 From Pedro Furlanetto : Thanks a lot Tom and Michael
10:47:36 From Niklas Hambüchen to All panelists : I have tried HIE
a couple times, getting better, but still way to go, also depending
on the editor you use
10:47:39 From Dan Banta : Fantastic. Thank you.
10:47:41 From Carlos Gomez : thx
10:47:43 From Marcel Tilly to All panelists : Thx
10:47:44 From Inga Shchelik to All panelists : thank you!
10:47:45 From Alexandre Garcia de Oliveira : Thank you
10:47:45 From Karol Kopiec to All panelists : thank you
10:47:45 From Nick Linker : Awesome
10:47:46 From Andre Artus : Bye.
10:47:46 From Franck Rasolo : Thanks for the presentation, looking
forward to the links!
10:47:47 From Frank Stüss to All panelists : bye all
10:47:47 From LUC DUZAN to All panelists : Thank you a lot!
10:47:48 From Corey O'Connor to All panelists : Thanks!
10:47:48 From Andrey Prokopenko : Thanks!
10:47:48 From Pedro Furlanetto : You too
10:47:50 From Konstantin Yegorov to All panelists : Thanks
10:47:53 From Marcel Tilly to All panelists : great
10:47:55 From Mo Kweon : What is a next presentation in the
Do you like this blog post and need help with DevOps, Rust or functional programming? Contact us.