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232 lines
8.4 KiB
232 lines
8.4 KiB
9 years ago
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;;; haskell-align-imports.el --- Align the import lines in a Haskell file -*- lexical-binding: t -*-
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;; Copyright (C) 2010 Chris Done
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;; Author: Chris Done <chrisdone@gmail.com>
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;; This file is not part of GNU Emacs.
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;; This program is free software: you can redistribute it and/or
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;; modify it under the terms of the GNU General Public License as
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;; published by the Free Software Foundation, either version 3 of
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;; the License, or (at your option) any later version.
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;; This program is distributed in the hope that it will be
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;; useful, but WITHOUT ANY WARRANTY; without even the implied
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;; warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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;; PURPOSE. See the GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public
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;; License along with this program. If not, see
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;; <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Consider the following imports list:
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;;
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;; import One
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;; import Two as A
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;; import qualified Three
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;; import qualified Four as PRELUDE
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;; import Five (A)
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;; import Six (A,B)
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;; import qualified Seven (A,B)
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;; import "abc" Eight
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;; import "abc" Nine as TWO
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;; import qualified "abc" Ten
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;; import qualified "defg" Eleven as PRELUDE
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;; import "barmu" Twelve (A)
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;; import "zotconpop" Thirteen (A,B)
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;; import qualified "z" Fourteen (A,B)
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;; import Fifteen hiding (A)
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;; import Sixteen as TWO hiding (A)
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;; import qualified Seventeen hiding (A)
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;; import qualified Eighteen as PRELUDE hiding (A)
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;; import "abc" Nineteen hiding (A)
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;; import "abc" Twenty as TWO hiding (A)
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;;
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;; When haskell-align-imports is run within the same buffer, the
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;; import list is transformed to:
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;;
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;; import "abc" Eight
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;; import qualified Eighteen as PRELUDE hiding (A)
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;; import qualified "defg" Eleven as PRELUDE
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;; import Fifteen hiding (A)
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;; import Five (A)
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;; import qualified Four as PRELUDE
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;; import qualified "z" Fourteen (A,B)
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;; import "abc" Nine as TWO
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;; import "abc" Nineteen hiding (A)
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;; import One
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;; import qualified Seven (A,B)
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;; import qualified Seventeen hiding (A)
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;; import Six (A,B)
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;; import Sixteen as TWO hiding (A)
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;; import qualified "abc" Ten
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;; import "zotconpop" Thirteen (A,B)
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;; import qualified Three
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;; import "barmu" Twelve (A)
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;; import "abc" Twenty as TWO hiding (A)
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;; import Two as A
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;;
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;; If you want everything after module names to be padded out, too,
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;; customize `haskell-align-imports-pad-after-name', and you'll get:
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;;
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;; import One
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;; import Two as A
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;; import qualified Three
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;; import qualified Four as PRELUDE
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;; import Five (A)
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;; import Six (A,B)
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;; import qualified Seven (A,B)
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;; import "abc" Eight
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;; import "abc" Nine as TWO
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;; import qualified "abc" Ten
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;; import qualified "defg" Eleven as PRELUDE
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;; import "barmu" Twelve (A)
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;; import "zotconpop" Thirteen (A,B)
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;; import qualified "z" Fourteen (A,B)
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;; import Fifteen hiding (A)
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;; import Sixteen as TWO hiding (A)
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;; import qualified Seventeen hiding (A)
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;; import qualified Eighteen as PRELUDE hiding (A)
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;; import "abc" Nineteen hiding (A)
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;; import "abc" Twenty as TWO hiding (A)
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;;; Code:
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(require 'cl-lib)
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(defvar haskell-align-imports-regexp
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(concat "^\\(import[ ]+\\)"
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"\\(qualified \\)?"
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"[ ]*\\(\"[^\"]*\" \\)?"
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"[ ]*\\([A-Za-z0-9_.']+\\)"
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"[ ]*\\([ ]*as [A-Z][^ ]*\\)?"
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"[ ]*\\((.*)\\)?"
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"\\([ ]*hiding (.*)\\)?"
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"\\( -- .*\\)?[ ]*$")
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"Regex used for matching components of an import.")
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;;;###autoload
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(defcustom haskell-align-imports-pad-after-name
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nil
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"Pad layout after the module name also."
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:type 'boolean
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:group 'haskell-interactive)
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;;;###autoload
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(defun haskell-align-imports ()
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"Align all the imports in the buffer."
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(interactive)
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(when (haskell-align-imports-line-match)
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(save-excursion
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(goto-char (point-min))
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(let* ((imports (haskell-align-imports-collect))
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(padding (haskell-align-imports-padding imports)))
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(mapc (lambda (x)
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(goto-char (cdr x))
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(delete-region (point) (line-end-position))
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(insert (haskell-align-imports-chomp
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(haskell-align-imports-fill padding (car x)))))
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imports))))
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nil)
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(defun haskell-align-imports-line-match ()
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"Try to match the current line as a regexp."
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(let ((line (buffer-substring-no-properties (line-beginning-position)
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(line-end-position))))
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(if (string-match "^import " line)
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line
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nil)))
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(defun haskell-align-imports-collect ()
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"Collect a list of mark / import statement pairs."
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(let ((imports '()))
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(while (not (or (equal (point) (point-max)) (haskell-align-imports-after-imports-p)))
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(let ((line (haskell-align-imports-line-match-it)))
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(when line
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(let ((match
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(haskell-align-imports-merge-parts
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(cl-loop for i from 1 to 8
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collect (haskell-align-imports-chomp (match-string i line))))))
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(setq imports (cons (cons match (line-beginning-position))
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imports)))))
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(forward-line))
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imports))
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(defun haskell-align-imports-merge-parts (l)
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"Merge together parts of an import statement that shouldn't be separated."
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(let ((parts (apply #'vector l))
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(join (lambda (ls)
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(cl-reduce (lambda (a b)
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(concat a
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(if (and (> (length a) 0)
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(> (length b) 0))
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" "
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"")
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b))
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ls))))
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(if haskell-align-imports-pad-after-name
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(list (funcall join (list (aref parts 0)
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(aref parts 1)
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(aref parts 2)))
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(aref parts 3)
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(funcall join (list (aref parts 4)
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(aref parts 5)
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(aref parts 6)))
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(aref parts 7))
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(list (funcall join (list (aref parts 0)
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(aref parts 1)
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(aref parts 2)))
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(funcall join (list (aref parts 3)
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(aref parts 4)
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(aref parts 5)
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(aref parts 6)
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(aref parts 7)))))))
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(defun haskell-align-imports-chomp (str)
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"Chomp leading and tailing whitespace from STR."
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(if str
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(replace-regexp-in-string "\\(^[[:space:]\n]*\\|[[:space:]\n]*$\\)" ""
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str)
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""))
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(defun haskell-align-imports-padding (imports)
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"Find the padding for each part of the import statements."
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(if (null imports)
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imports
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(cl-reduce (lambda (a b) (cl-mapcar #'max a b))
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(mapcar (lambda (x) (mapcar #'length (car x)))
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imports))))
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(defun haskell-align-imports-fill (padding line)
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"Fill an import line using the padding worked out from all statements."
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(mapconcat #'identity
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(cl-mapcar (lambda (pad part)
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(if (> (length part) 0)
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(concat part (make-string (- pad (length part)) ? ))
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(make-string pad ? )))
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padding
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line)
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" "))
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(defun haskell-align-imports-line-match-it ()
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"Try to match the current line as a regexp."
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(let ((line (buffer-substring-no-properties (line-beginning-position)
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(line-end-position))))
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(if (string-match haskell-align-imports-regexp line)
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line
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nil)))
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(defun haskell-align-imports-after-imports-p ()
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"Are we after the imports list?"
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(save-excursion
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(goto-char (line-beginning-position))
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(not (not (search-forward-regexp "\\( = \\|\\<instance\\>\\| :: \\| ∷ \\)"
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(line-end-position) t 1)))))
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(provide 'haskell-align-imports)
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;;; haskell-align-imports.el ends here
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