mirror of
https://github.com/m00natic/vlfi.git
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254 lines
11 KiB
EmacsLisp
254 lines
11 KiB
EmacsLisp
;;; vlf-occur.el --- Occur-like functionality for VLF -*- lexical-binding: t -*-
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;; Copyright (C) 2014 Free Software Foundation, Inc.
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;; Keywords: large files, indexing, occur
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;; Author: Andrey Kotlarski <m00naticus@gmail.com>
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;; URL: https://github.com/m00natic/vlfi
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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 GNU Emacs; see the file COPYING. If not, write to
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;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; This package provides the `vlf-occur' command which builds
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;; index of search occurrences in large file just like occur.
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;;; Code:
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(eval-when-compile
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(add-to-list 'load-path default-directory))
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(require 'vlf)
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(defvar vlf-occur-mode-map
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(let ((map (make-sparse-keymap)))
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(define-key map "n" 'vlf-occur-next-match)
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(define-key map "p" 'vlf-occur-prev-match)
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(define-key map "\C-m" 'vlf-occur-visit)
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(define-key map "\M-\r" 'vlf-occur-visit-new-buffer)
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(define-key map [mouse-1] 'vlf-occur-visit)
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(define-key map "o" 'vlf-occur-show)
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map)
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"Keymap for command `vlf-occur-mode'.")
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(define-derived-mode vlf-occur-mode special-mode "VLF[occur]"
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"Major mode for showing occur matches of VLF opened files.")
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(defun vlf-occur-next-match ()
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"Move cursor to next match."
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(interactive)
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(if (eq (get-char-property (point) 'face) 'match)
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(goto-char (next-single-property-change (point) 'face)))
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(goto-char (or (text-property-any (point) (point-max) 'face 'match)
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(text-property-any (point-min) (point)
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'face 'match))))
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(defun vlf-occur-prev-match ()
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"Move cursor to previous match."
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(interactive)
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(if (eq (get-char-property (point) 'face) 'match)
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(goto-char (previous-single-property-change (point) 'face)))
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(while (not (eq (get-char-property (point) 'face) 'match))
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(goto-char (or (previous-single-property-change (point) 'face)
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(point-max)))))
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(defun vlf-occur-show (&optional event)
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"Visit current `vlf-occur' link in a vlf buffer but stay in the \
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occur buffer. If original VLF buffer has been killed,
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open new VLF session each time.
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EVENT may hold details of the invocation."
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(interactive (list last-nonmenu-event))
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(let ((occur-buffer (if event
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(window-buffer (posn-window
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(event-end event)))
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(current-buffer))))
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(vlf-occur-visit event)
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(pop-to-buffer occur-buffer)))
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(defun vlf-occur-visit-new-buffer ()
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"Visit `vlf-occur' link in new vlf buffer."
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(interactive)
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(let ((current-prefix-arg t))
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(vlf-occur-visit)))
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(defun vlf-occur-visit (&optional event)
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"Visit current `vlf-occur' link in a vlf buffer.
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With prefix argument or if original VLF buffer has been killed,
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open new VLF session.
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EVENT may hold details of the invocation."
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(interactive (list last-nonmenu-event))
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(when event
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(set-buffer (window-buffer (posn-window (event-end event))))
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(goto-char (posn-point (event-end event))))
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(let* ((pos (point))
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(pos-relative (- pos (line-beginning-position) 1))
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(file (get-char-property pos 'file)))
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(if file
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(let ((chunk-start (get-char-property pos 'chunk-start))
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(chunk-end (get-char-property pos 'chunk-end))
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(vlf-buffer (get-char-property pos 'buffer))
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(occur-buffer (current-buffer))
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(match-pos (+ (get-char-property pos 'line-pos)
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pos-relative)))
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(cond (current-prefix-arg
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(setq vlf-buffer (vlf file))
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(switch-to-buffer occur-buffer))
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((not (buffer-live-p vlf-buffer))
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(or (catch 'found
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(dolist (buf (buffer-list))
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(set-buffer buf)
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(and vlf-mode (equal file buffer-file-name)
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(setq vlf-buffer buf)
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(throw 'found t))))
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(setq vlf-buffer (vlf file)))
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(switch-to-buffer occur-buffer)))
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(pop-to-buffer vlf-buffer)
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(vlf-move-to-chunk chunk-start chunk-end)
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(goto-char match-pos)))))
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(defun vlf-occur (regexp)
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"Make whole file occur style index for REGEXP.
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Prematurely ending indexing will still show what's found so far."
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(interactive (list (read-regexp "List lines matching regexp"
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(if regexp-history
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(car regexp-history)))))
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(if (buffer-modified-p) ;use temporary buffer not to interfere with modifications
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(let ((vlf-buffer (current-buffer))
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(file buffer-file-name)
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(batch-size vlf-batch-size))
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(with-temp-buffer
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(setq buffer-file-name file)
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(set-buffer-modified-p nil)
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(set (make-local-variable 'vlf-batch-size) batch-size)
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(vlf-mode 1)
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(goto-char (point-min))
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(vlf-with-undo-disabled
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(vlf-build-occur regexp vlf-buffer))))
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(let ((start-pos vlf-start-pos)
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(end-pos vlf-end-pos)
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(pos (point)))
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(vlf-beginning-of-file)
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(goto-char (point-min))
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(vlf-with-undo-disabled
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(unwind-protect (vlf-build-occur regexp (current-buffer))
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(vlf-move-to-chunk start-pos end-pos)
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(goto-char pos))))))
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(defun vlf-build-occur (regexp vlf-buffer)
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"Build occur style index for REGEXP over VLF-BUFFER."
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(let ((case-fold-search t)
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(line 1)
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(last-match-line 0)
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(last-line-pos (point-min))
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(file buffer-file-name)
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(total-matches 0)
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(match-end-pos (+ vlf-start-pos (position-bytes (point))))
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(occur-buffer (generate-new-buffer
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(concat "*VLF-occur " (file-name-nondirectory
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buffer-file-name)
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"*")))
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(line-regexp (concat "\\(?5:[\n\C-m]\\)\\|\\(?10:"
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regexp "\\)"))
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(batch-step (/ vlf-batch-size 8))
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(end-of-file nil)
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(reporter (make-progress-reporter
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(concat "Building index for " regexp "...")
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vlf-start-pos vlf-file-size)))
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(unwind-protect
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(progn
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(while (not end-of-file)
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(if (re-search-forward line-regexp nil t)
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(progn
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(setq match-end-pos (+ vlf-start-pos
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(position-bytes
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(match-end 0))))
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(if (match-string 5)
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(setq line (1+ line) ; line detected
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last-line-pos (point))
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(let* ((chunk-start vlf-start-pos)
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(chunk-end vlf-end-pos)
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(line-pos (line-beginning-position))
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(line-text (buffer-substring
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line-pos (line-end-position))))
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(with-current-buffer occur-buffer
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(unless (= line last-match-line) ;new match line
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(insert "\n:") ; insert line number
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(let* ((overlay-pos (1- (point)))
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(overlay (make-overlay
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overlay-pos
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(1+ overlay-pos))))
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(overlay-put overlay 'before-string
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(propertize
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(number-to-string line)
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'face 'shadow)))
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(insert (propertize line-text ; insert line
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'file file
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'buffer vlf-buffer
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'chunk-start chunk-start
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'chunk-end chunk-end
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'mouse-face '(highlight)
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'line-pos line-pos
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'help-echo
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(format "Move to line %d"
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line))))
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(setq last-match-line line
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total-matches (1+ total-matches))
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(let ((line-start (1+
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(line-beginning-position)))
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(match-pos (match-beginning 10)))
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(add-text-properties ; mark match
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(+ line-start match-pos (- last-line-pos))
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(+ line-start (match-end 10)
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(- last-line-pos))
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(list 'face 'match
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'help-echo
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(format "Move to match %d"
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total-matches))))))))
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(setq end-of-file (= vlf-end-pos vlf-file-size))
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(unless end-of-file
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(let ((batch-move (- vlf-end-pos batch-step)))
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(vlf-move-to-batch (if (< batch-move match-end-pos)
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match-end-pos
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batch-move) t))
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(goto-char (if (< vlf-start-pos match-end-pos)
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(or (byte-to-position (- match-end-pos
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vlf-start-pos))
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(point-min))
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(point-min)))
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(setq last-match-line 0
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last-line-pos (line-beginning-position))
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(progress-reporter-update reporter vlf-end-pos))))
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(progress-reporter-done reporter))
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(set-buffer-modified-p nil)
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(if (zerop total-matches)
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(progn (with-current-buffer occur-buffer
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(set-buffer-modified-p nil))
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(kill-buffer occur-buffer)
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(message "No matches for \"%s\"" regexp))
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(with-current-buffer occur-buffer
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(goto-char (point-min))
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(insert (propertize
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(format "%d matches in %d lines for \"%s\" \
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in file: %s" total-matches line regexp file)
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'face 'underline))
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(set-buffer-modified-p nil)
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(forward-char 2)
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(vlf-occur-mode))
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(display-buffer occur-buffer)))))
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(provide 'vlf-occur)
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;;; vlf-occur.el ends here
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