l-function.el query

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<shell-maker-failed-command>
Claude Code> can you tell me what l-function.el is about?
<shell-maker-end-of-prompt>
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  I'll read the file to understand what it's about.

▼  completed   read  Read l-function.el

  ```
  Reading file failed: Cannot read properties of undefined (reading 'indexOf')
  ```

  Let me try to find the file first:

▼  completed   search  Find `**/*l-function.el`

  /Users/alvaro/stuff/active/code/third_party/l-el/lib/utilities/l-function.el

▼  completed   read  Read lib/utilities/l-function.el

  ```
  ;;; package --- Summary ;;; -*- lexical-binding: t; l-syntax: t; -*-

  ;; Copyright (C) 2025 Laura Viglioni

  ;; Author: Laura Viglioni
  ;; Keywords: lisp, functional, programming, utilities
  ;; URL: https://github.com/viglioni/l-el

  ;; This file is not part of GNU Emacs.

  ;; This program is free software: you can redistribute it and/or modify
  ;; it under the terms of the GNU General Public License as published by
  ;; the Free Software Foundation, either version 3 of the License, or
  ;; (at your option) any later version.

  ;; This program is distributed in the hope that it will be useful,
  ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  ;; GNU General Public License for more details.

  ;; You should have received a copy of the GNU General Public License
  ;; along with this program.  If not, see <https://www.gnu.org/licenses/>.

  ;;; Commentary:

  ;; This is a sublibrary of l.el providing additional functionality.
  ;; This file uses l-syntax
  ;;
  ;; since 0.4.0

  ;;; Code:

  (require 'l-main)

  (defmacro lcomp (&rest fns)
    "`lcomp' provides function composition right to left.

  Function composition allows you to combine multiple functions into a single
  function, where the output of one function becomes the input of the next.
  The composition is applied right to left, meaning the rightmost function
  is applied first.

  Each argument is automatically wrapped with `__', so you can use the `__'
  placeholder syntax directly: (lcomp (+ __ 1) (* __ 2)) instead of
  \(lcomp (__ (+ __ 1)) (__ (* __ 2))).

  since: 0.4.0

  Arguments:
  - No arguments: returns identity function
  - One function: returns the function unchanged
  - Two or more functions: returns composed function

  Examples:
  Basic composition with lambdas:
  \(ldef double (l x -> (* 2 x)))
  \(ldef add-one (l x -> (+ 1 x)))
  \(funcall (lcomp add-one double) 5) ;; => 11

  Using __ placeholder syntax:
  \(funcall (lcomp (+ __ 1) (* __ 2)) 5) ;; => 11

  With `with-l' for cleaner syntax:
  \(with-l ((lcomp (+ __ 1) (* __ 2)) 5)) ;; => 11

  Multiple function composition:
  \(with-l ((lcomp (l x -> (+ x 1)) (* __ 2) (* __ 3)) 10)) ;; => 61

  String processing example:
  \(with-l ((lcomp upcase string-trim) \"  hello  \")) ;; => \"HELLO\"

  With local bindings:
  \(let ((square (lambda (x) (* x x))))
    (with-l ((lcomp (+ __ 1) square) 3))) ;; => 10"
    `(l--comp ,@(mapcar (lambda (x) `(__ ,x)) fns)))


  @doc "Internal function for `lcomp'. Composes functions right to left."
  (ldef l--comp () (l x -> x))
  (ldef l--comp ((f :function)) f)
  (ldef l--comp ((f :function) (g :function))
        `(lambda (&rest args) (funcall (quote ,f) (apply (quote ,g) args))))
  (ldef l--comp ((f :function) (g :function) (fn-list :rest))
        (apply 'l--comp (l--comp f g) fn-list))

  (provide 'l-function)
  ;;; l-function.el ends here

  ```

  `l-function.el` is a sublibrary of **l.el** that provides **function composition** utilities for Emacs Lisp. Here's what it does:

  ## Main Feature: `lcomp` macro

  The file provides the `lcomp` macro, which enables right-to-left function composition (similar to mathematical function composition). Key aspects:

  - **Right-to-left composition**: The rightmost function is applied first, then the result flows leftward
  - **Automatic `__` wrapping**: Each argument is automatically wrapped with `__`, so you can use placeholder syntax directly
  - **Multiple arities**: Handles 0, 1, or many functions gracefully

  ## Examples from the code:

  ```elisp
  ;; Simple composition: first multiply by 2, then add 1
  (funcall (lcomp (+ __ 1) (* __ 2)) 5) ;; => 11

  ;; String processing: trim, then uppercase
  (with-l ((lcomp upcase string-trim) "  hello  ")) ;; => "HELLO"

  ;; Multiple functions
  (with-l ((lcomp (+ __ 1) (* __ 2) (* __ 3)) 10)) ;; => 61
  ```

  The implementation uses pattern matching via `ldef` to handle different cases:
  - No functions → identity function
  - One function → return it unchanged  
  - Two or more → compose them using the internal `l--comp` function

  This is a functional programming utility that was added in version 0.4.0 of l.el.

Claude Code> can you fix the Intrnal typo?
<shell-maker-end-of-prompt>
  I'll fix the typo "Intrnal" to "Internal" in the file.

▼  failed   edit  Edit `lib/utilities/l-function.el`

  ```
  The provided `old_string` does not appear in the file: "@doc "Internal function for `lcomp'. Composes functions right to left."".

  No edits were applied.
  ```



  ╭─────────╮
  │ changes │
  ╰─────────╯

  Let me read the file again to see the exact text:

▼  completed   search  grep "Intrnal" lib/utilities/l-function.el

  78:@doc "Intrnal function for `lcomp'. Composes functions right to left."

  [Showing results with pagination = limit: 20, offset: 0]

▼  completed   edit  Edit `lib/utilities/l-function.el`

  ╭─────────╮
  │ changes │
  ╰─────────╯

  @@ -75,7 +75,7 @@
     `(l--comp ,@(mapcar (lambda (x) `(__ ,x)) fns)))
   
   
  -@doc "Intrnal function for `lcomp'. Composes functions right to left."
  +@doc "Internal function for `lcomp'. Composes functions right to left."
   (ldef l--comp () (l x -> x))
   (ldef l--comp ((f :function)) f)
   (ldef l--comp ((f :function) (g :function))

  Fixed! I've corrected the typo "Intrnal" to "Internal" in the documentation comment at lib/utilities/l-function.el:78.

Claude Code>