72 lines
2.3 KiB
Scheme
72 lines
2.3 KiB
Scheme
|
;; user/group-dependent stuff
|
||
|
|
|
||
|
|
(define (resolve-tilde-file-name fname)
|
||
|
|
(let ((len (string-length fname)))
|
||
|
|
(if (and (> len 0) (char=? #\~ (string-ref fname 0)))
|
||
|
|
(let ((tilde->homedir (lambda (end)
|
||
|
|
(if (= end 1)
|
||
|
|
home-directory ; Just ~
|
||
|
|
(let* ((user (substring fname 1 end))
|
||
|
|
(ui (name->user-info user)))
|
||
|
|
(user-info:home-dir ui))))))
|
||
|
|
(cond ((string-index fname #\/ 1) =>
|
||
|
|
(lambda (slash)
|
||
|
|
(string-append (tilde->homedir slash) "/"
|
||
|
|
(substring fname (+ slash 1) len))))
|
||
|
|
(else (tilde->homedir len))))
|
||
|
|
fname)))
|
||
|
|
|
||
|
|
(define (resolve-file-name fname . maybe-root)
|
||
|
|
(let* ((root (ensure-file-name-is-nondirectory (:optional maybe-root ".")))
|
||
|
|
(fname (ensure-file-name-is-nondirectory fname)))
|
||
|
|
(if (zero? (string-length fname))
|
||
|
|
"/"
|
||
|
|
(let ((c (string-ref fname 0)))
|
||
|
|
(cond ((char=? #\/ c) fname) ; Absolute file name.
|
||
|
|
|
||
|
|
((char=? #\~ c) ; ~ file name
|
||
|
|
(resolve-tilde-file-name fname))
|
||
|
|
|
||
|
|
(else (string-append (file-name-as-directory root) fname)))))))
|
||
|
|
|
||
|
|
(define (expand-file-name fname . maybe-dir)
|
||
|
|
(simplify-file-name (apply resolve-file-name fname maybe-dir)))
|
||
|
|
|
||
|
|
;; process-state-dependent stuff
|
||
|
|
|
||
|
|
(define (absolute-file-name fname . maybe-root)
|
||
|
|
(let ((fname (ensure-file-name-is-nondirectory fname)))
|
||
|
|
(if (zero? (string-length fname))
|
||
|
|
"/"
|
||
|
|
(simplify-file-name
|
||
|
|
(if (char=? #\/ (string-ref fname 0))
|
||
|
|
fname ; Absolute file name.
|
||
|
|
(let ((root (:optional maybe-root (cwd))))
|
||
|
|
(string-append (file-name-as-directory root) fname)))))))
|
||
|
|
|
||
|
|
;;; Ugh.
|
||
|
|
(define (substitute-env-vars str)
|
||
|
|
(let lp ((ans '()) (s str))
|
||
|
|
(let ((len (string-length s)))
|
||
|
|
(cond
|
||
|
|
((zero? len) (apply string-append (reverse! ans)))
|
||
|
|
((string-index s #\$) =>
|
||
|
|
(lambda (i)
|
||
|
|
(let ((ans (cons (substring s 0 i) ans))
|
||
|
|
(s (substring s (+ i 1) len))
|
||
|
|
(len (- len (+ i 1))))
|
||
|
|
(if (zero? len)
|
||
|
|
(lp ans "")
|
||
|
|
(let ((next-char (string-ref s 0)))
|
||
|
|
(cond ((char=? #\{ next-char)
|
||
|
|
(cond ((string-index s #\}) =>
|
||
|
|
(lambda (i)
|
||
|
|
(lp (cons (getenv (substring s 1 i)) ans)
|
||
|
|
(substring s (+ i 1) len))))
|
||
|
|
(else (error "Unbalanced ${ delimiter in string" s))))
|
||
|
|
(else
|
||
|
|
(let ((i (or (string-index s #\/) len)))
|
||
|
|
(lp (cons (getenv (substring s 0 i)) ans)
|
||
|
|
(substring s i len))))))))))
|
||
|
|
(else (lp (cons s ans) ""))))))
|