Du kan inte välja fler än 25 ämnen
Ämnen måste starta med en bokstav eller siffra, kan innehålla bindestreck ('-') och vara max 35 tecken långa.
130 rader
4.7 KiB
130 rader
4.7 KiB
;;; haskell-navigate-imports.el --- A function for cycling through Haskell import lists -*- lexical-binding: t -*-
|
|
|
|
;; Copyright (C) 2010 Chris Done
|
|
|
|
;; Author: Chris Done <chrisdone@gmail.com>
|
|
|
|
;; This file is not part of GNU Emacs.
|
|
|
|
;; 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, see
|
|
;; <http://www.gnu.org/licenses/>.
|
|
|
|
;;; Commentary:
|
|
|
|
;; The cycling step will stop once at the last import list so
|
|
;; that it is easy to add a new import list.
|
|
|
|
;; This module works completely independently of any libraries
|
|
;; (including haskell-mode).
|
|
|
|
;; Exports three interactive functions:
|
|
;; 1. haskell-navigate-imports
|
|
;; 2. haskell-navigate-imports-go
|
|
;; 3. haskell-navigate-imports-return
|
|
|
|
;; Example usage:
|
|
|
|
;; (require 'haskell-navigate-imports)
|
|
;; (define-key haskell-mode-map (kbd "<f8>") 'haskell-navigate-imports)
|
|
|
|
;;; Code:
|
|
|
|
(defvar haskell-navigate-imports-start-point nil)
|
|
|
|
(defvar haskell-literate) ; defined in haskell-mode.el
|
|
|
|
;;;###autoload
|
|
(defun haskell-navigate-imports (&optional return)
|
|
"Cycle the Haskell import lines or return to point (with prefix arg)."
|
|
(interactive "P")
|
|
(if return
|
|
(haskell-navigate-imports-return)
|
|
(haskell-navigate-imports-go)))
|
|
|
|
;;;###autoload
|
|
(defun haskell-navigate-imports-go ()
|
|
"Go to the first line of a list of consecutive import lines. Cycles."
|
|
(interactive)
|
|
(unless (or (haskell-navigate-imports-line)
|
|
(equal (line-beginning-position) (point-min))
|
|
(save-excursion (forward-line -1)
|
|
(haskell-navigate-imports-line)))
|
|
(setq haskell-navigate-imports-start-point (point)))
|
|
(haskell-navigate-imports-go-internal))
|
|
|
|
;;;###autoload
|
|
(defun haskell-navigate-imports-return ()
|
|
"Return to the non-import point we were at before going to the module list.
|
|
If we were originally at an import list, we can just cycle through easily."
|
|
(interactive)
|
|
(when haskell-navigate-imports-start-point
|
|
(goto-char haskell-navigate-imports-start-point)))
|
|
|
|
(defun haskell-navigate-imports-go-internal ()
|
|
"Go to the first line of a list of consecutive import lines. Cycle."
|
|
(if (haskell-navigate-imports-line)
|
|
(progn (haskell-navigate-imports-goto-end)
|
|
(when (haskell-navigate-imports-find-forward-line)
|
|
(haskell-navigate-imports-go-internal)))
|
|
(let ((point (haskell-navigate-imports-find-forward-line)))
|
|
(if point
|
|
(goto-char point)
|
|
(progn (goto-char (point-min))
|
|
(if (haskell-navigate-imports-find-forward-line)
|
|
(haskell-navigate-imports-go-internal)
|
|
(let ((module (if (eq haskell-literate 'bird)
|
|
"^> ?module"
|
|
"^module")))
|
|
(when (search-forward-regexp module nil t 1)
|
|
(search-forward "\n\n" nil t 1)))))))))
|
|
|
|
(defun haskell-navigate-imports-goto-end ()
|
|
"Skip a bunch of consecutive import lines."
|
|
(while (not (or (equal (point)
|
|
(point-max))
|
|
(not (haskell-navigate-imports-line))))
|
|
(forward-line)))
|
|
|
|
(defun haskell-navigate-imports-find-forward-line ()
|
|
"Return a point with at an import line, or nothing."
|
|
(save-excursion
|
|
(while (not (or (equal (point) (point-max))
|
|
(haskell-navigate-imports-after-imports-p) ;; This one just speeds it up.
|
|
(haskell-navigate-imports-line)))
|
|
(forward-line))
|
|
(if (haskell-navigate-imports-line)
|
|
(point)
|
|
nil)))
|
|
|
|
(defun haskell-navigate-imports-line ()
|
|
"Try to match the current line as a regexp."
|
|
(let ((line (buffer-substring-no-properties (line-beginning-position)
|
|
(line-end-position)))
|
|
(import (if (eq haskell-literate 'bird)
|
|
"^> ?import "
|
|
"^import ")))
|
|
(if (string-match import line)
|
|
line
|
|
nil)))
|
|
|
|
(defun haskell-navigate-imports-after-imports-p ()
|
|
"Are we after the imports list? Just for a speed boost."
|
|
(save-excursion
|
|
(goto-char (line-beginning-position))
|
|
(not (not (search-forward-regexp "\\( = \\|\\<instance\\>\\| :: \\)"
|
|
(line-end-position) t 1)))))
|
|
|
|
(provide 'haskell-navigate-imports)
|
|
|
|
;;; haskell-navigate-imports.el ends here
|