;; Copyright (c) 2003 Nikodemus Siivola
;; 
;; Permission is hereby granted, free of charge, to any person obtaining
;; a copy of this software and associated documentation files (the
;; "Software"), to deal in the Software without restriction, including
;; without limitation the rights to use, copy, modify, merge, publish,
;; distribute, sublicense, and/or sell copies of the Software, and to
;; permit persons to whom the Software is furnished to do so, subject to
;; the following conditions:
;; 
;; The above copyright notice and this permission notice shall be included
;; in all copies or substantial portions of the Software.
;; 
;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
;; IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
;; CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
;; TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
;; SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
(in-package readline)

(defvar *whitespace* (list #\Space #\Tab))

(let (cl-complete)
  
  (defun add-completion (string)
    "Add STRING as a custom-completion."
    (setq cl-complete nil)
    (with-cstring (c-str string)
      (= 1 (libreadline::add-completion c-str))))

  (defun clear-completions ()
    "Clear all custom-completions."
    (setq cl-complete nil)
    (libreadline::clear-completions))
  
  (defun use-custom-complete ()
    "Use custom-competions."
    (libreadline::use-custom-complete)
    nil)
  
  (defun use-filename-complete ()
    "Use default completion system. (filename)"
    (libreadline::use-filename-complete)
    nil)

  (defun use-cl-complete ()
    "Load symbols in package CL-USER as custom-completions."
    (unless cl-complete
      (setq cl-complete t)
      (clear-completions)
      (do-symbols (sym (find-package :cl-user))
	(add-completion (string-downcase (string sym)))))
    (use-custom-complete)
    nil)

  (defun add-history (string)
    "Add STRING to history."
    (with-cstring (c-string string)
      (libreadline::add-history c-string))
    string)
  
  (defun readline (&key (prompt "") (history t))
    "Read a line from current TTY with line-editing."
    (with-cstring (c-prompt prompt)
      (let ((str (string-trim
		  *whitespace*
		  (convert-from-cstring (libreadline::readline c-prompt)))))
	(when (and history (not (string= "" str)))
	  (add-history str))))))