Xah Talk Show 2026-06-29 Ep800. learning fsharp with ai, walk dir. find string. call shell command.

• https://youtu.be/dmDIJhQHQGM

Video Summary (Generated by AI, Edited by Human.)

In this episode of the Xah Talk Show (Ep800), host Xah Lee spends the livestream exploring F# programming with the help of AI, while also sharing anecdotes about his history with software development and programming languages.

Coding with F# and AI:

Throughout the stream, Xah uses AI to help him write and understand F# scripts for various file system tasks:

Directory Traversal: He explores how to recursively walk a directory (16:34 - 23:12) and discusses the difference between recursive and non-recursive implementations (23:25 - 28:00).

File Processing: He demonstrates how to read files, extract specific lines (like the first 10 lines of an HTML file), and manipulate file paths to get names, directories, and extensions (40:58 - 49:45, 142:55 - 145:50).

Shell Commands: Towards the end, he learns how to execute shell commands from within an F# script (148:13 - 149:25). Historical Ramblings and Community Discussion:

Disney and Arabian Nights: The video begins with a lengthy, humorous, and critical discussion about Disney's depiction of Princess Jasmine and the Arabian Nights (3:40 - 16:22).

Programming History: Xah shares his personal journey with programming, specifically why he moved on from Haskell (103:57 - 104:35, 116:03 - 117:00). He discusses the history of the Darks (distributed revision control) system and the "theory of patches," comparing it to Git and his own past experiences with the Haskell community (117:00 - 139:26).

Technology and Tools: He discusses speech recognition software, the evolution from "dragon speak" to modern AI-powered "voice typing" (53:16 - 58:32), and touches on his history as a content creator (146:08 - 147:57).

now, write a fsharp script, go thru a dir recursively , for each png file, call cwebp to convert it to webp

• script to walk a dir.
• filter by filename extension

• find how to get filename sans extension, or dir name, or just file name.
• compare my emacs lisp or PowerShell tutorial

• how to call a shell command.
• e.g. call cwebp
• convert image webp

• Fsharp Learning Notes
• Fsharp: List Dir Content (walk dir)
• Fsharp: File path operations

• Princess Jasmine by Grok AI (2026)

• Emacs: Xah Fly Keys 📦

• Ultimate Hacking Keyboard 80 (UHK 80)
• Nulea M505 Trackball
• Huion H640P Drawing Tablet

(*
2026-06-29
go thru a dir,
open each html file
print first 10 lines.
 *)

open System.IO

let rootPath = @"c:/Users/xah/web/xahlee_info/talk_show/"

Directory.EnumerateFiles(rootPath, "*.html")
|> Seq.iter (fun path ->
    try
        printfn "=== %s ===" (Path.GetFileName path)
        File.ReadLines(path)
        |> Seq.truncate 10
        |> Seq.iter (printfn "%s")
        printfn ""  // empty line between files
    with
    | _ -> printfn "Error reading: %s" path
)