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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 tools base)
#:use-module (rnrs exceptions)
#:use-module (rnrs io ports)
#:use-module (srfi srfi-171)
#:use-module (ice-9 format)
#:use-module (ice-9 ftw)
#:use-module (ice-9 regex)
#:use-module (kaakaa tools)
#:export (%list-files
%base-tools))
(define (binary-file? file)
"Return @code{#t} if @var{file} is a binary file. Else, return @code{#f}."
;; We use the following heuristic: If there are character decoding errors in
;; the first 10K characters, we assume that this is a binary file.
(guard (c ((or (i/o-decoding-error? c)
(eq? (exception-kind c)
'decoding-error))
#t))
(call-with-input-file file
(lambda (port)
(set-port-conversion-strategy! port 'error)
(get-string-n port (* 10 1024))))
#f))
(define (make-regexp* pattern)
"Like @code{make-regexp}, but report an error and abort if @var{pattern} is not a
valid regular expression."
(guard (c ((eq? (exception-kind c)
'regular-expression-syntax)
(format (current-output-port)
"Error: Invalid regular expression: ~s~%"
pattern)
(exit #f)))
(make-regexp pattern)))
(define (files-recursively directory pattern)
"Return a list of all files recursively down @var{directory} whose basename
matches regular expression @var{pattern}. Hidden directories are not traversed."
(cond
((not (file-exists? directory))
(format (current-output-port)
"Error: Directory ~a does not exist~%"
directory)
(exit #f))
((not (eq? (stat:type (stat directory))
'directory))
(format (current-output-port)
"Error: ~a is not a directory~%"
directory)
(exit #f))
(else
(let ((pattern-rx (make-regexp* pattern)))
(file-system-fold (lambda (path stat result)
(not (string-prefix? "." (basename path))))
(lambda (path stat result)
(if (regexp-exec pattern-rx (basename path))
(cons path result)
result))
(lambda (path stat result)
result)
(lambda (path stat result)
result)
(lambda (path stat result)
result)
(lambda (path stat errno result)
(format (current-output-port)
"Error: ~a: ~a~%"
path
(strerror errno))
result)
(list)
(canonicalize-path directory))))))
(define %read
(tool #:description "Read whole text file, or optionally a subset of its lines.
Line numbers start from 1. Output is the raw file contents without line numbers."
#:parameters `(("path" . ,(tool-parameter
#:type "string"
#:description "File path to read"
#:required? #t))
("start-line" . ,(tool-parameter
#:type "integer"
#:description "Read file starting from this line number (inclusive). Default is 1."))
("end-line" . ,(tool-parameter
#:type "integer"
#:description "Read up to this line number (inclusive). Default is the last line of the file.")))
#:proc (lambda* (#:key path (start-line 1) end-line)
(cond
((not (file-exists? path))
(format (current-output-port)
"Error: File ~a does not exist~%"
path)
(exit #f))
((binary-file? path)
(format (current-output-port)
"Error: File ~a is binary, not text~%"
path)
(exit #f))
(else
(call-with-input-file path
(cut port-transduce
(compose (tdrop (1- start-line))
(if end-line
(ttake (- end-line (1- start-line)))
(tmap identity))
(tlog (lambda (result input)
(display input)
(newline))))
(const #t)
get-line
<>)))))
#:title (lambda* (#:key path (start-line 1) end-line)
(format #f "read ~a:~a-~a"
path start-line (or end-line "")))
#:kind (const "read")))
(define %list
(tool #:description "List files recursively.
The output is in three columns—the file type, the file size and the file path."
#:parameters `(("root" . ,(tool-parameter
#:type "string"
#:description "Root path to list from"
#:required? #t))
("pattern" . ,(tool-parameter
#:type "string"
#:description
"POSIX extended regular expression to match basename (including extension) of
file against. Default matches all files.
For example, to match all scheme (.scm) files, use \"\\.scm$\"")))
#:proc (lambda* (#:key root (pattern "."))
(for-each (lambda (path)
(let ((st (stat path)))
(format (current-output-port)
"~a~/~a~/~a~%"
(stat:type st)
(stat:size st)
path)))
(files-recursively root pattern)))
#:title (lambda* (#:key root pattern)
(if pattern
(format #f "list ~s in ~a" pattern root)
(format #f "list ~a" root)))
#:kind (const "search")))
(define %base-tools
`(("read" . ,%read)
("list" . ,%list)))
;; TODO: Implement write and grep.
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