factor/misc/fuel/fuel-completion.el

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;;; fuel-completion.el -- completion utilities
;; Copyright (C) 2008, 2009 Jose Antonio Ortega Ruiz
;; See http://factorcode.org/license.txt for BSD license.
;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
;; Keywords: languages, fuel, factor
;; Start date: Sun Dec 14, 2008 21:17
;;; Comentary:
;; Code completion utilities.
;;; Code:
(require 'fuel-base)
(require 'fuel-eval)
(require 'fuel-log)
(require 'factor-mode)
;;; Aux:
(defvar fuel-completion--minibuffer-map
(let ((map (make-keymap)))
(set-keymap-parent map minibuffer-local-completion-map)
(define-key map "?" 'self-insert-command)
map))
;;; Vocabs dictionary:
(defvar fuel-completion--vocabs nil)
(defun fuel-completion--vocabs (&optional reload)
(when (or reload (not fuel-completion--vocabs))
(fuel-respecting-message "Retrieving vocabs list")
(let ((fuel-log--inhibit-p t))
(setq fuel-completion--vocabs
(fuel-eval--retort-result
(fuel-eval--send/wait '(:fuel* (fuel-get-vocabs) "fuel" (:array)))))))
fuel-completion--vocabs)
(defvar fuel-completion--vocab-history nil)
(defun fuel-completion--read-vocab (&optional reload init-input history)
(let ((minibuffer-local-completion-map fuel-completion--minibuffer-map)
(vocabs (fuel-completion--vocabs reload)))
(completing-read "Vocab name: " vocabs nil nil
init-input (or history fuel-completion--vocab-history))))
(defun fuel-completion--words (prefix vocabs)
(let ((vs (if vocabs (cons :array vocabs) 'f))
(us (or vocabs 't)))
(fuel-eval--retort-result
(fuel-eval--send/wait `(:fuel* (,prefix ,vs fuel-get-words) t ,us)))))
;;; Completions window handling, heavily inspired in slime's:
(defvar fuel-completion--comp-buffer "*Completions*")
(defvar-local fuel-completion--window-cfg nil
"Window configuration before we show the *Completions* buffer.
This is buffer local in the buffer where the completion is
performed.")
(defvar-local fuel-completion--completions-window nil
"The window displaying *Completions* after saving window configuration.
If this window is no longer active or displaying the completions
buffer then we can ignore `fuel-completion--window-cfg'.")
(defun fuel-completion--save-window-cfg ()
"Maybe save the current window configuration.
Return true if the configuration was saved."
(unless (or fuel-completion--window-cfg
(get-buffer-window fuel-completion--comp-buffer))
(setq fuel-completion--window-cfg
(current-window-configuration))
t))
(defun fuel-completion--delay-restoration ()
(add-hook 'pre-command-hook
'fuel-completion--maybe-restore-window-cfg
nil t))
(defun fuel-completion--forget-window-cfg ()
(setq fuel-completion--window-cfg nil)
(setq fuel-completion--completions-window nil))
(defun fuel-completion--restore-window-cfg ()
"Restore the window config if available."
(remove-hook 'pre-command-hook
'fuel-completion--maybe-restore-window-cfg)
(when (and fuel-completion--window-cfg
(fuel-completion--window-active-p))
(save-excursion
(set-window-configuration fuel-completion--window-cfg))
(setq fuel-completion--window-cfg nil)
(when (buffer-live-p fuel-completion--comp-buffer)
(kill-buffer fuel-completion--comp-buffer))))
(defun fuel-completion--maybe-restore-window-cfg ()
"Restore the window configuration, if the following command
terminates a current completion."
(remove-hook 'pre-command-hook
'fuel-completion--maybe-restore-window-cfg)
(condition-case err
(cond ((cl-find last-command-event "()\"'`,# \r\n:")
(fuel-completion--restore-window-cfg))
((not (fuel-completion--window-active-p))
(fuel-completion--forget-window-cfg))
(t (fuel-completion--delay-restoration)))
(error
;; Because this is called on the pre-command-hook, we mustn't let
;; errors propagate.
(message "Error in fuel-completion--restore-window-cfg: %S" err))))
(defun fuel-completion--window-active-p ()
"Is the completion window currently active?"
(and (window-live-p fuel-completion--completions-window)
(equal (buffer-name (window-buffer fuel-completion--completions-window))
fuel-completion--comp-buffer)))
(defun fuel-completion--display-comp-list (completions base)
(let ((savedp (fuel-completion--save-window-cfg)))
(with-output-to-temp-buffer fuel-completion--comp-buffer
(display-completion-list completions base)
(let ((offset (- (point) 1 (length base))))
(with-current-buffer standard-output
(setq completion-base-position offset)
(set-syntax-table factor-mode-syntax-table))))
(when savedp
(setq fuel-completion--completions-window
(get-buffer-window fuel-completion--comp-buffer)))))
(defun fuel-completion--display-or-scroll (completions base)
(cond ((and (eq last-command this-command) (fuel-completion--window-active-p))
(fuel-completion--scroll-completions))
(t (fuel-completion--display-comp-list completions base)))
(fuel-completion--delay-restoration))
(defun fuel-completion--scroll-completions ()
(let ((window fuel-completion--completions-window))
(with-current-buffer (window-buffer window)
(if (pos-visible-in-window-p (point-max) window)
(set-window-start window (point-min))
(save-selected-window
(select-window window)
(scroll-up))))))
;;; Completion functionality:
(defun fuel-completion--word-list (prefix)
(let* ((fuel-log--inhibit-p t)
(cv (factor-current-vocab))
(vs (and cv `("syntax" ,cv ,@(factor-usings)))))
(fuel-completion--words prefix vs)))
(defsubst fuel-completion--all-words-list (prefix)
(fuel-completion--words prefix nil))
(defvar fuel-completion--word-list-func
(completion-table-dynamic 'fuel-completion--word-list))
(defvar fuel-completion--all-words-list-func
(completion-table-dynamic 'fuel-completion--all-words-list))
(defun fuel-completion--complete (prefix vocabs)
(let* ((words (if vocabs
(fuel-completion--vocabs)
(fuel-completion--word-list prefix)))
(completions (all-completions prefix words))
(partial (try-completion prefix words))
(partial (if (eq partial t) prefix partial)))
(cons completions partial)))
(defun fuel-completion--read-word (prompt &optional default history all)
(let ((minibuffer-local-completion-map fuel-completion--minibuffer-map))
(completing-read prompt
(if all fuel-completion--all-words-list-func
fuel-completion--word-list-func)
nil nil nil
history
(or default (factor-symbol-at-point)))))
(defun fuel-completion--complete-symbol ()
"Complete the symbol at point.
Perform completion similar to Emacs' complete-symbol."
(interactive)
(let* ((end (point))
(beg (save-excursion (factor-beginning-of-symbol) (point)))
(prefix (buffer-substring-no-properties beg end))
(result (fuel-completion--complete prefix (factor-on-vocab)))
(completions (car result))
(partial (cdr result)))
(cond ((null completions)
(fuel-respecting-message "Can't find completion for %S" prefix)
(fuel-completion--restore-window-cfg))
(t (insert-and-inherit (substring partial (length prefix)))
(cond ((= (length completions) 1)
(fuel-respecting-message "Sole completion")
(fuel-completion--restore-window-cfg))
(t (fuel-respecting-message "Complete but not unique")
(fuel-completion--display-or-scroll completions
partial)))))))
(provide 'fuel-completion)
;;; fuel-completion.el ends here