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;; Deepenv
;; Copyright (C) 2024 Guillaume Pasquet
;; 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 <http://www.gnu.org/licenses/>.
(import scheme
(chicken base)
(chicken pathname)
(chicken file)
(chicken io)
(chicken string)
(chicken process)
(chicken process-context)
srfi-1
srfi-13
srfi-14)
(define (dir-has-.env? dir)
(file-exists? (make-pathname dir ".env")))
(define (split-env-line line)
(let* ((definition (string-split line "="))
(key (car definition))
(value (string-trim-both (cadr definition)
(list->char-set (list #\") char-set:whitespace))))
(cons key value)))
(define (read-env-line port)
"Read an env-definition line from PORT and return as a cons cell"
(let ((line (read-line port)))
(if (eq? line #!eof)
#!eof
(split-env-line line))))
(define (load-dir-.env dir)
"Load a .env file present in `.dir` and return its environment definitions as a alist"
(let ((.env-file (conc dir "/.env")))
(if (file-exists? .env-file)
(with-input-from-file .env-file
(lambda () (read-list (current-input-port) read-env-line)))
'())))
(define (path-parts path)
(call-with-values
(lambda () (decompose-directory path))
(lambda (origin base elts)
(if (not (eq? origin #f))
(cons origin elts)
(if (not (eq? base #f))
(cons base elts)
elts)))))
(define (path-parents path)
(fold (lambda (item acc)
(if (> (length acc) 0)
(if (string=? (car acc) "/")
(cons (conc "/" item) acc)
(cons (conc (car acc) "/" item) acc))
(list item)))
'()
(path-parts path)))
(define (.env-union alist2 alist1)
(lset-union (lambda (a b) (string=? (car a) (car b)))
alist2 alist1))
(define (resolve-program program)
(let* ((paths (map
(lambda (path)
(conc path "/" program))
(string-split (get-environment-variable "PATH") ":")))
(executables (filter file-exists? paths)))
(if (> (length executables) 0)
(car executables)
program)))
(let* ((parents (path-parents (current-directory)))
(environment (fold .env-union '() (cons (get-environment-variables) (reverse (map load-dir-.env parents)))))
(program (resolve-program (car (command-line-arguments))))
(arguments (cdr (command-line-arguments))))
(if program
(process-execute program arguments environment)
(display "Program not found\n")))
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