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;;; kaakaa --- Tiny, security-focused AI agent in Guile
;;; Copyright © 2026 Arun Isaac <arunisaac@systemreboot.net>
;;;
;;; This file is part of kaakaa.
;;;
;;; kaakaa 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.
;;;
;;; kaakaa 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 kaakaa. If not, see <https://www.gnu.org/licenses/>.
(define-module (kaakaa utils)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (ice-9 match)
#:use-module (ice-9 popen)
#:export (->
foldn
alist->plist
call-with-input-pipe))
(define (->-helper x . procs)
"Thread @var{x} through @var{procs}."
(match procs
(() x)
((head tail ...)
(apply ->-helper (head x) tail))))
(define-syntax-rule (-> x (proc ...) ...)
"Thread @var{x} through @var{procs}.
For example:
(-> 1
(1+ <>)
(* 2 <>)
(expt <> 2))
=> 16"
(->-helper x (cut proc ...) ...))
(define (foldn proc lst . inits)
"Apply @var{proc} to the elements of @var{lst} to build a result, and return
that result. @var{proc} may return multiple values, in which case, an equal
number of values are returned. Each @var{proc} call is @code{(proc element
previous ...)} where @code{element} is an element of @var{lst}, and
@code{(previous ...)} is the return from the previous call to @var{proc} or the
given @var{inits} for the first call. For example,
(foldn (lambda (n sum sum-of-squares)
(values (+ sum n)
(+ sum-of-squares (expt n 2))))
(iota 10)
0 0)
=> 45
=> 285"
(apply values
(fold (lambda (element results)
(call-with-values (cut apply proc element results) list))
inits
lst)))
(define (alist->plist alist)
"Convert association list @var{alist} to a property list. Keys in
@var{alist} are converted to keywords."
(append-map (match-lambda
((key . value)
(list (symbol->keyword (string->symbol key))
value)))
alist))
(define (call-with-input-pipe command proc)
"Call @var{proc} with input pipe to @var{command}. @var{command} is a
list of program arguments."
(match command
((prog args ...)
(let ((port #f))
(dynamic-wind
(lambda ()
(set! port (apply open-pipe* OPEN_READ prog args)))
(cut proc port)
(lambda ()
(unless (zero? (close-pipe port))
(error "Command invocation failed" command))))))))
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