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September 2020

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Online Lisp Meeting #9
by Michał "phoe" Herda 16 Sep '20

16 Sep '20

Good morning, everyone! The ninth Online Lisp Meeting will bring us Robert Strandh with his third installment in the Creating a Common Lisp Implementation series. > In this series of presentations, we examine different strategies for > creating a Common Lisp implementation, as well as the pros and cons of > each strategy. > > We assume basic knowledge about how a typical modern operating system > (such as Unix) works, and how traditional batch languages (such as C) > are compiled and executed on such a system. We furthermore assume > medium-level knowledge about Common Lisp. > > In part 3, we investigate one possible solution to the conundrum of > our first strategy outlined in part 2, namely the circular > compile-time dependencies between many standard macros and standard > functions, forcing us to write more code in a language other than > Common Lisp, and also forcing us to write "unnatural" Common Lisp > code. The solution to this problem is the foundation of our second > strategy for creating a Common Lisp implementation, and it relies on > using an existing host Common Lisp implementation for cross > compilation. > > Since some time has passed since part 1 and 2 were streamed, we > strongly recommend that interested participants make sure that the > material covered in those two parts is fresh in memory, if necessary > by watching those presentations again. A short Jitsi talk with everyone will happen just after the meeting - everyone is invited! Date/time/location: * Date: 16th September 2020 * Time: 13:00 CEST - https://time.is/en/CEST * Talk: https://www.twitch.tv/TwitchPlaysCommonLisp * Hangout: https://chat.heisig.xyz/TwitchPlaysCommonLisp @ 14:30 Massive thanks to Marco Heisig for providing the Jitsi instance where we can hang out after the talk. A mailing list has been created for the purpose of organizing and promoting the online talks. Further announcements will be posted there. See https://mailman.common-lisp.net/listinfo/online-lisp-meets Lisp videos always accepted! Please let me know if you'd like to talk about anything Lisp-related. BR and see you, Michał "phoe" Herda

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Online Lisp Meeting #8
by Michał "phoe" Herda 16 Sep '20

16 Sep '20

Hello, hey, hi, greetings! I am terribly sorry for posting the announcement for the next Online Lisp Meeting so late, since it will be in merely two days from now. I hope that most of you have already got slightly used to the bi-or-tri-weekly scheme of the Meetings and I am doubly sorry since I shall need to bend this one as well: I will announce two meetings, the eight, and the ninth, with just a week of delay between the two. (I will be unavailable during the rest of September, since life outside Lisp demands my attention.) The 2^3th meeting will contain a re-stream of a talk by Andrew Sengul, who will be presenting April, a compiler from the APL language to Common Lisp. (The announcement for the 3^2th meeting will come in a separate mail.) > APL stands for Array Programming Language and, as the name suggests, > is focused on working with arrays, making it great for for graphics, > signal processing, statistical work and more. > > Using APL within Lisp opens vast possibilities for working with > structured data. Traditionally, APL is implemented in the form of a > monolithic interpreter, and feeding data from databases and other > external APIs into these interpreters and getting the results back in > a usable format can be daunting. > > April is different. Compiling APL expressions into Lisp means that any > data that can be formatted as a number or character array in Lisp can > be operated upon using APL. Often, dozens of lines of number-crunching > code with many nested loops can be replaced by a single line of APL. > If you're working on a Lisp application that involves many operations > on arrays or uses complex algorithms in general, April can > substantially speed up your development process. > > In this talk Andrew will recount the trials of developing a new APL > compiler from scratch and cover some of April's unique advantages, > including macros that make it easy to extend and modify the language. > > This presentation will also feature a sneak preview of Bloxl, a > hardware startup powered by Common Lisp with April. Bloxl is producing > a new luminous structural display technology; with Bloxl, you can > build transparent glass walls that light up with software-controlled > pixel graphics. You can see more on the Bloxl website at https://bloxl.co. > > The original talk that will be restreamed will happen the day before > (https://www.meetup.com/LispNYC/events/vqhmbpybcmblb/) In order to > make the talk more accessible to European audiences (the original will > start at midnight CEST!), I have offered to re-stream the whole talk > with the ability to chat with the speaker on Twitch, which Andrew has > accepted. A short Jitsi talk with everyone will happen just after the meeting - everyone is invited! (I think it's better to organize those just after the meetings, because then they actually happen.) Date/time/location: Date: 9th September 2020 Time: 13:00 CEST - https://time.is/en/CEST Talk: https://www.twitch.tv/TwitchPlaysCommonLisp Hangout: https://chat.heisig.xyz/TwitchPlaysCommonLisp @ 14:30 Massive thanks to Marco Heisig for providing the Jitsi instance where we can hang out after the talk. A mailing list has been created for the purpose of organizing and promoting the online talks. Further announcements will be posted there. See https://mailman.common-lisp.net/listinfo/online-lisp-meets More videos welcome - please record and send me anything that you find interesting and is in any way related to Lisp. BR and see you! Michał "phoe" Herda

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