;;;
;;; gauche.package.util - internal utilities used in package manager
;;;
;;;   Copyright (c) 2004-2014  Shiro Kawai  <shiro@acm.org>
;;;
;;;   Redistribution and use in source and binary forms, with or without
;;;   modification, are permitted provided that the following conditions
;;;   are met:
;;;
;;;   1. Redistributions of source code must retain the above copyright
;;;      notice, this list of conditions and the following disclaimer.
;;;
;;;   2. Redistributions in binary form must reproduce the above copyright
;;;      notice, this list of conditions and the following disclaimer in the
;;;      documentation and/or other materials provided with the distribution.
;;;
;;;   3. Neither the name of the authors nor the names of its contributors
;;;      may be used to endorse or promote products derived from this
;;;      software without specific prior written permission.
;;;
;;;   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
;;;   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
;;;   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
;;;   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
;;;   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
;;;   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
;;;   TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
;;;   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
;;;   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;;   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;;   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;;

;;; NB: this module is not intended for external use.

(define-module gauche.package.util
  (use gauche.process)
  (use gauche.parameter)
  (use gauche.termios)
  (use srfi-14)
  (export run dry-run verbose-run get-password))
(select-module gauche.package.util)

(define dry-run     (make-parameter #f))
(define verbose-run (make-parameter #f))

(define (run cmdline :key (stdin-string #f))
  (when (or (dry-run) (verbose-run))
    (print cmdline))
  (unless (dry-run)
    (let1 p (run-process (cond-expand
                          [gauche.os.windows (win-break-cmdargs cmdline)]
                          [else `("/bin/sh" "-c" ,cmdline)])
                         :input (if stdin-string :pipe :null)
                         :wait #f)
      (when stdin-string
        (let1 pi (process-input p)
          (display stdin-string pi)
          (flush pi)
          (close-output-port pi)))
      (process-wait p)
      (unless (zero? (process-exit-status p))
        (errorf "command execution failed: ~a" cmdline)))))

;; A kludge to parse unix-style command line to break into list of
;; arguments.  We pass the list to run-process, which eventually
;; calls sys-exec, which takes care of proper escaping for CreateProcess
;; windows API.  This isn't probably general enough, but I guess it
;; suffices for the command lines we're dealing during building.
(define (win-break-cmdargs cmdline)
  (define (word in)
    (let loop ([chs '()] [in-quote #f])
      (let1 ch (read-char in)
        (cond [(eof-object? ch)
               (if (null? chs)
                 ch
                 (list->string (reverse chs)))]
              [(and (char-whitespace? ch) (not in-quote))
               (if (null? chs)
                 (loop '() in-quote)
                 (list->string (reverse chs)))]
              [(char=? ch #\")
               (case in-quote
                 [(#\") (loop chs #f)] ;out
                 [(#\') (loop (cons ch chs) in-quote)] ;as-is
                 [else  (loop chs ch)])] ;in
              [(char=? ch #\')
               (case in-quote
                 [(#\") (loop (cons ch chs) in-quote)] ;as-is
                 [(#\') (loop chs #f)] ;out
                 [else  (loop chs ch)])] ;in
              [else (loop (cons ch chs) in-quote)]))))

  (call-with-input-string cmdline (cut port->list word <>)))

;; Read password from the terminal without echoing
(define (get-password)
  (with-output-to-file
      (cond-expand [gauche.os.windows "CON"] [else "/dev/tty"])
    (lambda () (display "Password: ") (flush)))
  (without-echoing #f read-line))

