17ee0e400b
After moving off of Meta, Dotfiles has a greater responsibility to manage configs. Vim, Tmux, and Emacs are now within Stow's purview.
231 lines
8.4 KiB
EmacsLisp
231 lines
8.4 KiB
EmacsLisp
;;; haskell-align-imports.el --- Align the import lines in a Haskell file -*- 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:
|
|
|
|
;; Consider the following imports list:
|
|
;;
|
|
;; import One
|
|
;; import Two as A
|
|
;; import qualified Three
|
|
;; import qualified Four as PRELUDE
|
|
;; import Five (A)
|
|
;; import Six (A,B)
|
|
;; import qualified Seven (A,B)
|
|
;; import "abc" Eight
|
|
;; import "abc" Nine as TWO
|
|
;; import qualified "abc" Ten
|
|
;; import qualified "defg" Eleven as PRELUDE
|
|
;; import "barmu" Twelve (A)
|
|
;; import "zotconpop" Thirteen (A,B)
|
|
;; import qualified "z" Fourteen (A,B)
|
|
;; import Fifteen hiding (A)
|
|
;; import Sixteen as TWO hiding (A)
|
|
;; import qualified Seventeen hiding (A)
|
|
;; import qualified Eighteen as PRELUDE hiding (A)
|
|
;; import "abc" Nineteen hiding (A)
|
|
;; import "abc" Twenty as TWO hiding (A)
|
|
;;
|
|
;; When haskell-align-imports is run within the same buffer, the
|
|
;; import list is transformed to:
|
|
;;
|
|
;; import "abc" Eight
|
|
;; import qualified Eighteen as PRELUDE hiding (A)
|
|
;; import qualified "defg" Eleven as PRELUDE
|
|
;; import Fifteen hiding (A)
|
|
;; import Five (A)
|
|
;; import qualified Four as PRELUDE
|
|
;; import qualified "z" Fourteen (A,B)
|
|
;; import "abc" Nine as TWO
|
|
;; import "abc" Nineteen hiding (A)
|
|
;; import One
|
|
;; import qualified Seven (A,B)
|
|
;; import qualified Seventeen hiding (A)
|
|
;; import Six (A,B)
|
|
;; import Sixteen as TWO hiding (A)
|
|
;; import qualified "abc" Ten
|
|
;; import "zotconpop" Thirteen (A,B)
|
|
;; import qualified Three
|
|
;; import "barmu" Twelve (A)
|
|
;; import "abc" Twenty as TWO hiding (A)
|
|
;; import Two as A
|
|
;;
|
|
;; If you want everything after module names to be padded out, too,
|
|
;; customize `haskell-align-imports-pad-after-name', and you'll get:
|
|
;;
|
|
;; import One
|
|
;; import Two as A
|
|
;; import qualified Three
|
|
;; import qualified Four as PRELUDE
|
|
;; import Five (A)
|
|
;; import Six (A,B)
|
|
;; import qualified Seven (A,B)
|
|
;; import "abc" Eight
|
|
;; import "abc" Nine as TWO
|
|
;; import qualified "abc" Ten
|
|
;; import qualified "defg" Eleven as PRELUDE
|
|
;; import "barmu" Twelve (A)
|
|
;; import "zotconpop" Thirteen (A,B)
|
|
;; import qualified "z" Fourteen (A,B)
|
|
;; import Fifteen hiding (A)
|
|
;; import Sixteen as TWO hiding (A)
|
|
;; import qualified Seventeen hiding (A)
|
|
;; import qualified Eighteen as PRELUDE hiding (A)
|
|
;; import "abc" Nineteen hiding (A)
|
|
;; import "abc" Twenty as TWO hiding (A)
|
|
|
|
;;; Code:
|
|
|
|
(require 'cl-lib)
|
|
|
|
(defvar haskell-align-imports-regexp
|
|
(concat "^\\(import[ ]+\\)"
|
|
"\\(qualified \\)?"
|
|
"[ ]*\\(\"[^\"]*\" \\)?"
|
|
"[ ]*\\([A-Za-z0-9_.']+\\)"
|
|
"[ ]*\\([ ]*as [A-Z][^ ]*\\)?"
|
|
"[ ]*\\((.*)\\)?"
|
|
"\\([ ]*hiding (.*)\\)?"
|
|
"\\( -- .*\\)?[ ]*$")
|
|
"Regex used for matching components of an import.")
|
|
|
|
(defcustom haskell-align-imports-pad-after-name
|
|
nil
|
|
"Pad layout after the module name also."
|
|
:type 'boolean
|
|
:group 'haskell-interactive)
|
|
|
|
;;;###autoload
|
|
(defun haskell-align-imports ()
|
|
"Align all the imports in the buffer."
|
|
(interactive)
|
|
(when (haskell-align-imports-line-match)
|
|
(save-excursion
|
|
(goto-char (point-min))
|
|
(let* ((imports (haskell-align-imports-collect))
|
|
(padding (haskell-align-imports-padding imports)))
|
|
(mapc (lambda (x)
|
|
(goto-char (cdr x))
|
|
(delete-region (point) (line-end-position))
|
|
(insert (haskell-align-imports-chomp
|
|
(haskell-align-imports-fill padding (car x)))))
|
|
imports))))
|
|
nil)
|
|
|
|
(defun haskell-align-imports-line-match ()
|
|
"Try to match the current line as a regexp."
|
|
(let ((line (buffer-substring-no-properties (line-beginning-position)
|
|
(line-end-position))))
|
|
(if (string-match "^import " line)
|
|
line
|
|
nil)))
|
|
|
|
(defun haskell-align-imports-collect ()
|
|
"Collect a list of mark / import statement pairs."
|
|
(let ((imports '()))
|
|
(while (not (or (equal (point) (point-max)) (haskell-align-imports-after-imports-p)))
|
|
(let ((line (haskell-align-imports-line-match-it)))
|
|
(when line
|
|
(let ((match
|
|
(haskell-align-imports-merge-parts
|
|
(cl-loop for i from 1 to 8
|
|
collect (haskell-align-imports-chomp (match-string i line))))))
|
|
(setq imports (cons (cons match (line-beginning-position))
|
|
imports)))))
|
|
(forward-line))
|
|
imports))
|
|
|
|
(defun haskell-align-imports-merge-parts (l)
|
|
"Merge together parts of an import statement that shouldn't be separated."
|
|
(let ((parts (apply #'vector l))
|
|
(join (lambda (ls)
|
|
(cl-reduce (lambda (a b)
|
|
(concat a
|
|
(if (and (> (length a) 0)
|
|
(> (length b) 0))
|
|
" "
|
|
"")
|
|
b))
|
|
ls))))
|
|
(if haskell-align-imports-pad-after-name
|
|
(list (funcall join (list (aref parts 0)
|
|
(aref parts 1)
|
|
(aref parts 2)))
|
|
(aref parts 3)
|
|
(funcall join (list (aref parts 4)
|
|
(aref parts 5)
|
|
(aref parts 6)))
|
|
(aref parts 7))
|
|
(list (funcall join (list (aref parts 0)
|
|
(aref parts 1)
|
|
(aref parts 2)))
|
|
(funcall join (list (aref parts 3)
|
|
(aref parts 4)
|
|
(aref parts 5)
|
|
(aref parts 6)
|
|
(aref parts 7)))))))
|
|
|
|
(defun haskell-align-imports-chomp (str)
|
|
"Chomp leading and tailing whitespace from STR."
|
|
(if str
|
|
(replace-regexp-in-string "\\(^[[:space:]\n]*\\|[[:space:]\n]*$\\)" ""
|
|
str)
|
|
""))
|
|
|
|
(defun haskell-align-imports-padding (imports)
|
|
"Find the padding for each part of the import statements."
|
|
(if (null imports)
|
|
imports
|
|
(cl-reduce (lambda (a b) (cl-mapcar #'max a b))
|
|
(mapcar (lambda (x) (mapcar #'length (car x)))
|
|
imports))))
|
|
|
|
(defun haskell-align-imports-fill (padding line)
|
|
"Fill an import line using the padding worked out from all statements."
|
|
(mapconcat #'identity
|
|
(cl-mapcar (lambda (pad part)
|
|
(if (> (length part) 0)
|
|
(concat part (make-string (- pad (length part)) ? ))
|
|
(make-string pad ? )))
|
|
padding
|
|
line)
|
|
" "))
|
|
|
|
(defun haskell-align-imports-line-match-it ()
|
|
"Try to match the current line as a regexp."
|
|
(let ((line (buffer-substring-no-properties (line-beginning-position)
|
|
(line-end-position))))
|
|
(if (string-match haskell-align-imports-regexp line)
|
|
line
|
|
nil)))
|
|
|
|
(defun haskell-align-imports-after-imports-p ()
|
|
"Are we after the imports list?"
|
|
(save-excursion
|
|
(goto-char (line-beginning-position))
|
|
(let ((case-fold-search nil))
|
|
(not (not (search-forward-regexp "\\( = \\|\\<instance\\>\\| :: \\| ∷ \\)"
|
|
(line-end-position) t 1))))))
|
|
|
|
(provide 'haskell-align-imports)
|
|
|
|
;;; haskell-align-imports.el ends here
|