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;; Tekuti
;; Copyright (C) 2008 Andy Wingo <wingo at pobox dot com>
;; 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, contact:
;;
;; Free Software Foundation Voice: +1-617-542-5942
;; 59 Temple Place - Suite 330 Fax: +1-617-542-2652
;; Boston, MA 02111-1307, USA gnu@gnu.org
;;; Commentary:
;;
;; This is the main script that will launch tekuti.
;;
;;; Code:
(define-module (tekuti util)
#:use-module (match-bind)
#:use-module (srfi srfi-1)
#:export (expanduser match-lines dbg unwind-protect dbg dsu-sort
hash-push! list-has-length? list-head-match mapn
list-intersperse with-backtrace define-memoized))
(define (expanduser path)
(let ((parts (string-split path #\/)))
(if (eqv? (string-ref (car parts) 0) #\~)
(let ((user (if (= (string-length (car parts)) 1)
(cuserid)
(substring (car parts) 1))))
(string-join (cons (passwd:dir (getpwnam user)) (cdr parts)) "/"))
path)))
(define-macro (match-lines string pattern bindings expr)
(let ((line (gensym)) (seed (gensym)))
`(,fold
(lambda (,line ,seed)
(match-bind ,pattern ,line ,bindings
(cons ,expr ,seed)
,seed))
'() (string-split ,string #\newline))))
(define (dbg fmt . args)
(apply format (current-error-port) fmt args))
(define-macro (unwind-protect form . cleanups)
`(dynamic-wind (lambda () #t)
(lambda () ,form)
(lambda () ,@cleanups)))
(define (dsu-sort list key less)
(map cdr
(stable-sort (map (lambda (x) (cons (key x) x)) list)
(lambda (x y) (less (car x) (car y))))))
(define (hash-push! h key value)
(let ((handle (hash-create-handle! h key '())))
(set-cdr! handle (cons value (cdr handle)))))
(define (list-has-length? list len)
(cond
((zero? len) (null? list))
((null? list) #f)
(else (list-has-length? (cdr list) (1- len)))))
;; returns tail of l2
(define (list-head-match l1 l2 n)
(cond
((zero? n) l2)
((null? l2) #f)
((not (equal? (car l1) (car l2))) #f)
(else (list-head-match (cdr l1) (cdr l2) (1- n)))))
(define (mapn proc l nmax)
(let lp ((in l) (out '()) (n nmax))
(if (or (null? in) (zero? n))
(reverse out)
(lp (cdr in) (cons (proc (car in)) out) (1- n)))))
(define (list-intersperse src-l elem)
(if (null? src-l) src-l
(let loop ((l (cdr src-l)) (dest (cons (car src-l) '())))
(if (null? l) (reverse dest)
(loop (cdr l) (cons (car l) (cons elem dest)))))))
(define (handle-error key . args)
(let ((cep (current-error-port))
(highlights (if (or (eq? key 'wrong-type-arg)
(eq? key 'out-of-range))
(list-ref args 3)
'())))
(newline cep)
(display "Backtrace:\n")
(display-backtrace (fluid-ref the-last-stack) cep
#f #f highlights)
(newline cep)
(if (= (length args) 4)
(apply display-error (fluid-ref the-last-stack) cep args)
(format cep "~a" args))
(force-output cep)
(apply throw key args)))
(define (with-backtrace proc)
(debug-enable 'backtrace)
(start-stack 'with-backtrace
(catch #t
proc
handle-error
(lambda args
(fluid-set! the-last-stack (make-stack #t 2 0))
(apply throw args)))))
(define (memoize1 proc)
(let ((old-args #f) (cache #f) (proc proc))
(lambda args
(if (equal? args old-args)
cache
(let ((val (apply proc args)))
(set! old-args args)
(set! cache val)
val)))))
(define-macro (define-memoized form . body)
`(begin
(define ,form ,@body)
(set! ,(car form) (,memoize1 ,(car form)))))
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