forked from colonelpanic/dotfiles
362 lines
12 KiB
EmacsLisp
362 lines
12 KiB
EmacsLisp
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;;; evil-types.el --- Type system
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;; Author: Vegard Øye <vegard_oye at hotmail.com>
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;; Maintainer: Vegard Øye <vegard_oye at hotmail.com>
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;; Version: 1.0.1
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;;
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;; This file is NOT part of GNU Emacs.
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;;; License:
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;; This file is part of Evil.
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;;
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;; Evil 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 of the License, or
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;; (at your option) any later version.
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;;
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;; Evil 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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;;
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;; You should have received a copy of the GNU General Public License
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;; along with Evil. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; A type defines a transformation on a pair of buffer positions.
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;; Types are used by Visual state (character/line/block selection)
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;; and Operator-Pending state (character/line/block motions).
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;;
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;; The basic transformation is "expansion". For example, the `line'
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;; type "expands" a pair of positions to whole lines by moving the
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;; first position to the beginning of the line and the last position
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;; to the end of the line. That expanded selection is what the rest
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;; of Emacs sees and acts on.
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;;
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;; An optional transformation is "contraction", which is the opposite
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;; of expansion. If the transformation is one-to-one, expansion
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;; followed by contraction always returns the original range.
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;; (The `line' type is not one-to-one, as it may expand multiple
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;; positions to the same lines.)
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;;
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;; Another optional transformation is "normalization", which takes
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;; two unexpanded positions and adjusts them before expansion.
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;; This is useful for cleaning up "invalid" positions.
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;;
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;; Types are defined at the end of this file using the macro
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;; `evil-define-type'.
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(require 'evil-common)
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(require 'evil-macros)
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;;; Code:
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;;; Type definitions
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(evil-define-type exclusive
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"Return the positions unchanged, with some exceptions.
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If the end position is at the beginning of a line, then:
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* If the beginning position is at or before the first non-blank
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character on the line, return `line' (expanded).
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* Otherwise, move the end position to the end of the previous
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line and return `inclusive' (expanded)."
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:normalize (lambda (beg end)
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(cond
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((progn
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(goto-char end)
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(and (/= beg end) (bolp)))
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(setq end (max beg (1- end)))
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(cond
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((progn
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(goto-char beg)
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(looking-back "^[ \f\t\v]*" (line-beginning-position)))
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(evil-expand beg end 'line))
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(t
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(unless evil-cross-lines
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(setq end (max beg (1- end))))
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(evil-expand beg end 'inclusive))))
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(t
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(evil-range beg end))))
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:string (lambda (beg end)
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(let ((width (- end beg)))
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(format "%s character%s" width
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(if (= width 1) "" "s")))))
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(evil-define-type inclusive
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"Include the character under point.
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If the end position is at the beginning of a line or the end of a
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line and `evil-want-visual-char-semi-exclusive', then:
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* If in visual state return `exclusive' (expanded)."
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:expand (lambda (beg end)
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(if (and evil-want-visual-char-semi-exclusive
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(evil-visual-state-p)
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(< beg end)
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(save-excursion
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(goto-char end)
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(or (bolp) (eolp))))
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(evil-range beg end 'exclusive)
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(evil-range beg (1+ end))))
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:contract (lambda (beg end)
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(evil-range beg (max beg (1- end))))
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:normalize (lambda (beg end)
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(goto-char end)
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(when (eq (char-after) ?\n)
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(setq end (max beg (1- end))))
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(evil-range beg end))
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:string (lambda (beg end)
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(let ((width (- end beg)))
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(format "%s character%s" width
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(if (= width 1) "" "s")))))
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(evil-define-type line
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"Include whole lines."
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:one-to-one nil
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:expand (lambda (beg end)
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(evil-range
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(progn
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(goto-char beg)
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(min (line-beginning-position)
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(progn
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;; move to beginning of line as displayed
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(evil-move-beginning-of-line)
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(line-beginning-position))))
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(progn
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(goto-char end)
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(max (line-beginning-position 2)
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(progn
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;; move to end of line as displayed
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(evil-move-end-of-line)
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(line-beginning-position 2))))))
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:contract (lambda (beg end)
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(evil-range beg (max beg (1- end))))
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:string (lambda (beg end)
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(let ((height (count-lines beg end)))
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(format "%s line%s" height
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(if (= height 1) "" "s")))))
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(evil-define-type block
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"Like `inclusive', but for rectangles:
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the last column is included."
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:expand (lambda (beg end &rest properties)
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(let ((beg-col (evil-column beg))
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(end-col (evil-column end))
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(corner (plist-get properties :corner)))
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;; Since blocks are implemented as a pair of buffer
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;; positions, expansion is restricted to what the buffer
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;; allows. In the case of a one-column block, there are
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;; two ways to expand it (either move the upper corner
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;; beyond the lower corner, or the lower beyond the
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;; upper), so try out both possibilities when
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;; encountering the end of the line.
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(cond
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((= beg-col end-col)
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(goto-char end)
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(cond
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((eolp)
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(goto-char beg)
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(if (eolp)
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(evil-range beg end)
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(evil-range (1+ beg) end)))
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((memq corner '(lower-right upper-right right))
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(evil-range (1+ beg) end))
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(t
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(evil-range beg (1+ end)))))
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((< beg-col end-col)
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(goto-char end)
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(if (eolp)
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(evil-range beg end)
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(evil-range beg (1+ end))))
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(t
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(goto-char beg)
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(if (eolp)
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(evil-range beg end)
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(evil-range (1+ beg) end))))))
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:contract (lambda (beg end)
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(let ((beg-col (evil-column beg))
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(end-col (evil-column end)))
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(if (> beg-col end-col)
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(evil-range (1- beg) end)
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(evil-range beg (max beg (1- end))))))
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:string (lambda (beg end)
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(let ((height (count-lines
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beg
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(progn
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(goto-char end)
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(if (and (bolp) (not (eobp)))
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(1+ end)
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end))))
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(width (abs (- (evil-column beg)
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(evil-column end)))))
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(format "%s row%s and %s column%s"
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height
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(if (= height 1) "" "s")
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width
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(if (= width 1) "" "s"))))
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:rotate (lambda (beg end &rest properties)
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"Rotate block according to :corner property.
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:corner can be one of `upper-left',``upper-right', `lower-left'
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and `lower-right'."
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(let ((left (evil-column beg))
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(right (evil-column end))
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(corner (or (plist-get properties :corner)
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'upper-left)))
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(evil-sort left right)
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(goto-char beg)
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(if (memq corner '(upper-right lower-left))
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(move-to-column right)
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(move-to-column left))
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(setq beg (point))
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(goto-char end)
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(if (memq corner '(upper-right lower-left))
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(move-to-column left)
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(move-to-column right))
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(setq end (point))
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(setq properties (plist-put properties
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:corner corner))
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(apply #'evil-range beg end properties))))
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(evil-define-type rectangle
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"Like `exclusive', but for rectangles:
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the last column is excluded."
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:expand (lambda (beg end)
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;; select at least one column
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(if (= (evil-column beg) (evil-column end))
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(evil-expand beg end 'block)
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(evil-range beg end 'block))))
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;;; Standard interactive codes
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(evil-define-interactive-code "*"
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"Signal error if the buffer is read-only."
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(when buffer-read-only
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(signal 'buffer-read-only nil)))
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(evil-define-interactive-code "b" (prompt)
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"Name of existing buffer."
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(list (read-buffer prompt (current-buffer) t)))
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(evil-define-interactive-code "c"
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"Read character."
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(list (read-char)))
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(evil-define-interactive-code "p"
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"Prefix argument converted to number."
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(list (prefix-numeric-value current-prefix-arg)))
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(evil-define-interactive-code "P"
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"Prefix argument in raw form."
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(list current-prefix-arg))
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;;; Custom interactive codes
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(evil-define-interactive-code "<c>"
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"Count."
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(list (when current-prefix-arg
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(prefix-numeric-value
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current-prefix-arg))))
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(evil-define-interactive-code "<vc>"
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"Count, but only in visual state.
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This should be used by an operator taking a count. In normal
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state the count should not be handled by the operator but by the
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motion that defines the operator's range. In visual state the
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range is specified by the visual region and the count is not used
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at all. Thus in the case the operator may use the count
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directly."
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(list (when (and (evil-visual-state-p) current-prefix-arg)
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(prefix-numeric-value
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current-prefix-arg))))
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(evil-define-interactive-code "<C>"
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"Character read through `evil-read-key'."
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(list (evil-read-key)))
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(evil-define-interactive-code "<r>"
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"Untyped motion range (BEG END)."
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(evil-operator-range))
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(evil-define-interactive-code "<R>"
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"Typed motion range (BEG END TYPE)."
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(evil-operator-range t))
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(evil-define-interactive-code "<v>"
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"Typed motion range of visual range(BEG END TYPE).
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If visual state is inactive then those values are nil."
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(if (evil-visual-state-p)
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(let ((range (evil-visual-range)))
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(list (car range)
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(cadr range)
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(evil-type range)))
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(list nil nil nil)))
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(evil-define-interactive-code "<x>"
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"Current register."
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(list evil-this-register))
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(evil-define-interactive-code "<y>"
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"Current yank-handler."
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(list (evil-yank-handler)))
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(evil-define-interactive-code "<a>"
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"Ex argument."
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:ex-arg t
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(list (when (evil-ex-p) evil-ex-argument)))
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(evil-define-interactive-code "<f>"
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"Ex file argument."
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:ex-arg file
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(list (when (evil-ex-p) (evil-ex-file-arg))))
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(evil-define-interactive-code "<b>"
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"Ex buffer argument."
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:ex-arg buffer
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(list (when (evil-ex-p) evil-ex-argument)))
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(evil-define-interactive-code "<sh>"
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"Ex shell command argument."
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:ex-arg shell
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(list (when (evil-ex-p) evil-ex-argument)))
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(evil-define-interactive-code "<fsh>"
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"Ex file or shell command argument."
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:ex-arg file-or-shell
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(list (when (evil-ex-p) evil-ex-argument)))
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(evil-define-interactive-code "<sym>"
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"Ex symbolic argument."
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:ex-arg sym
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(list (when (and (evil-ex-p) evil-ex-argument)
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(intern evil-ex-argument))))
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(evil-define-interactive-code "<!>"
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"Ex bang argument."
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:ex-bang t
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(list (when (evil-ex-p) evil-ex-bang)))
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(evil-define-interactive-code "</>"
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"Ex delimited argument."
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(when (evil-ex-p)
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(evil-delimited-arguments evil-ex-argument)))
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(evil-define-interactive-code "<g/>"
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"Ex global argument."
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(when (evil-ex-p)
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(evil-ex-parse-global evil-ex-argument)))
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(evil-define-interactive-code "<s/>"
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"Ex substitution argument."
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:ex-arg substitution
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(when (evil-ex-p)
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(evil-ex-get-substitute-info evil-ex-argument)))
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(provide 'evil-types)
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;;; evil-types.el ends here
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