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133 lines
4.8 KiB
133 lines
4.8 KiB
;;; haskell-complete-module.el --- A fast way to complete Haskell module names -*- lexical-binding: t -*- |
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;; Copyright (c) 2014 Chris Done. All rights reserved. |
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;; This file is free software; you can redistribute it and/or modify |
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;; it under the terms of the GNU General Public License as published by |
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;; the Free Software Foundation; either version 3, or (at your option) |
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;; any later version. |
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;; This file is distributed in the hope that it will be useful, |
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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;; GNU General Public License for more details. |
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;; You should have received a copy of the GNU General Public License |
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;; along with this program. If not, see <http://www.gnu.org/licenses/>. |
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;;; Code: |
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(require 'cl-lib) |
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;;;###autoload |
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(defcustom haskell-complete-module-preferred |
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'() |
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"Override ordering of module results by specifying preferred modules." |
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:group 'haskell |
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:type '(repeat string)) |
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;;;###autoload |
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(defcustom haskell-complete-module-max-display |
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10 |
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"Maximum items to display in minibuffer." |
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:group 'haskell |
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:type 'number) |
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(defun haskell-complete-module-read (prompt candidates) |
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"Interactively auto-complete from a list of candidates." |
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(let ((stack (list)) |
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(pattern "") |
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(result nil)) |
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(delete-dups candidates) |
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(setq candidates |
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(sort candidates |
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(lambda (a b) |
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(let ((a-mem (member a haskell-complete-module-preferred)) |
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(b-mem (member b haskell-complete-module-preferred))) |
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(cond |
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((and a-mem (not b-mem)) |
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t) |
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((and b-mem (not a-mem)) |
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nil) |
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(t |
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(string< a b))))))) |
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(while (not result) |
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(let ((key |
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(key-description |
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(vector |
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(read-key |
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(concat (propertize prompt 'face 'minibuffer-prompt) |
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(propertize pattern 'face 'font-lock-type-face) |
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"{" |
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(mapconcat #'identity |
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(let* ((i 0)) |
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(cl-loop for candidate in candidates |
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while (<= i haskell-complete-module-max-display) |
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do (cl-incf i) |
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collect (cond ((> i haskell-complete-module-max-display) |
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"...") |
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((= i 1) |
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(propertize candidate 'face 'ido-first-match-face)) |
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(t candidate)))) |
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" | ") |
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"}")))))) |
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(cond |
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((string= key "C-g") |
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(keyboard-quit)) |
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((string= key "DEL") |
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(unless (null stack) |
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(setq candidates (pop stack))) |
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(unless (string= "" pattern) |
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(setq pattern (substring pattern 0 -1)))) |
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((string= key "RET") |
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(setq result (or (car candidates) |
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pattern))) |
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((string= key "<left>") |
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(setq candidates |
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(append (last candidates) |
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(butlast candidates)))) |
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((string= key "<right>") |
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(setq candidates |
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(append (cdr candidates) |
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(list (car candidates))))) |
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(t |
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(when (string-match "[A-Za-z0-9_'.]+" key) |
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(push candidates stack) |
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(setq pattern (concat pattern key)) |
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(setq candidates (haskell-complete-module pattern candidates))))))) |
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result)) |
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(defun haskell-complete-module (pattern candidates) |
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"Filter the CANDIDATES using PATTERN." |
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(let ((case-fold-search t)) |
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(cl-loop for candidate in candidates |
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when (haskell-complete-module-match pattern candidate) |
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collect candidate))) |
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(defun haskell-complete-module-match (pattern text) |
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"Match PATTERN against TEXT." |
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(string-match (haskell-complete-module-regexp pattern) |
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text)) |
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(defun haskell-complete-module-regexp (pattern) |
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"Make a regular expression for the given module pattern. Example: |
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\"c.m.s\" -> \"^c[^.]*\\.m[^.]*\\.s[^.]*\" |
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" |
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(let ((components (mapcar #'haskell-complete-module-component |
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(split-string pattern "\\." t)))) |
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(concat "^" |
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(mapconcat #'identity |
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components |
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"\\.")))) |
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(defun haskell-complete-module-component (component) |
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"Make a regular expression for the given component. Example: |
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\"co\" -> \"c[^.]*o[^.]*\" |
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" |
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(replace-regexp-in-string "\\(.\\)" "\\1[^.]*" component)) |
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(provide 'haskell-complete-module)
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