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1 ;;!emacs
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2 ;;
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3 ;; FILE: hmoccur.el
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4 ;; SUMMARY: Multi-buffer or multi-file regexp occurrence location.
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5 ;; USAGE: GNU Emacs Lisp Library
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6 ;; KEYWORDS: hypermedia, matching
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7 ;;
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8 ;; AUTHOR: Markus Freericks <mfx@cs.tu-berlin.de> / Bob Weiner
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9 ;; ORG: Technical University of Berlin / InfoDock Associates
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10 ;;
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11 ;; ORIG-DATE: 1-Aug-91
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12 ;; LAST-MOD: 31-Oct-96 at 22:35:01 by Bob Weiner
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13 ;;
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14 ;; This file is part of Hyperbole.
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15 ;; Available for use and distribution under the same terms as GNU Emacs.
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16 ;;
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17 ;; Copyright (C) 1991, Markus Freericks
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18 ;; Copyright (C) 1991-1996, Free Software Foundation, Inc.
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19 ;; Developed with support from Motorola Inc.
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20 ;;
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21 ;; DESCRIPTION:
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22 ;;
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23 ;; Modified by Bob Weiner to allow selection of a set of files within a
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24 ;; single directory to search. By default, {M-x moccur RET} searches
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25 ;; current buffers with files attached.
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26 ;;
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27 ;; Date: 1 Aug 91 15:47:27 GMT
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28 ;; From: mfx@cs.tu-berlin.de (Markus Freericks)
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29 ;; Subject: moccur - multibuffer occurences
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30 ;;
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31 ;; While editing some dozen or so files, i had the dire need for
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32 ;; something like 'occur' that can cope with multiple buffers. This has
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33 ;; probably been done before; but still, here is my try at it. It seems
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34 ;; to be very useful.
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35 ;;
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36 ;; How to use it: simple say
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37 ;; M-x moccur <regexp>
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38 ;; moccur then searches through *all buffers* currently existing that are
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39 ;; bound to files and displays the occurences in a buffer that runs in
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40 ;; Moccur-mode. Change to that buffer, scroll around, and say C-c C-c
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41 ;; to jump to the occurrence. Quite simple.
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42 ;;
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43 ;; Incompatibilites to Occur mode:
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44 ;; a) it browses through *all* buffers that have a file name
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45 ;; associated with them; those may or may not include the current
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46 ;; buffer. Especially, while standard occur works
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47 ;; on 'all lines following point', Moccur does not.
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48 ;; b) there is no support for the 'NLINE' argument.
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49 ;;
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50 ;; Usage:
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51 ;; moccur <regexp> shows all occurences of <regexp> in all buffers
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52 ;; currently existing that refer to files.
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53 ;; the occurences are displayed in a buffer running in Moccur mode;
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54 ;; C-c C-c gets you to the occurence
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55 ;;
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56 ;; DESCRIP-END.
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57
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58 ;;; ************************************************************************
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59 ;;; Public variables
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60 ;;; ************************************************************************
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61
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62 (defconst moccur-source-prefix "@loc> "
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63 "Prefix for lines indicating source of matches.")
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64
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65 ;;; ************************************************************************
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66 ;;; Public functions
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67 ;;; ************************************************************************
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68
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69 (defun moccur (regexp &optional file-regexp no-fold-search)
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70 "Show all lines of all buffers containing a match for REGEXP.
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71 With optional FILE-REGEXP, a pattern matching to files in a single
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72 directory, search matching files rather than current buffers.
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73 The lines are shown in a buffer named *Moccur* which serves as a menu to
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74 find any of the occurrences in this buffer.
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75 \\[describe-mode] in that buffer explains how."
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76 (interactive "sRegexp to find occurrences of: \nsFiles to search (default current file buffers): ")
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77 (if (equal file-regexp "") (setq file-regexp nil))
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78 (let* ((buffers (if file-regexp (directory-files
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79 (expand-file-name
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80 (or (file-name-directory
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81 file-regexp) "."))
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82 'full (file-name-nondirectory file-regexp))
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83 (buffer-list)))
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84 (occbuf (get-buffer-create "*Moccur*"))
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85 (matches 0)
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86 (firstmatch t))
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87 (set-buffer occbuf)
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88 (setq buffer-read-only nil)
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89 (widen)
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90 (erase-buffer)
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91 (insert "Lines matching '" regexp "':\n\n")
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92 (let ((currbuf) (currfile) (kill-buf))
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93 (while buffers
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94 (setq currbuf (car buffers)
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95 currfile (if (stringp currbuf) currbuf)
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96 kill-buf (and currfile (not (get-file-buffer currfile)))
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97 buffers (cdr buffers))
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98 (if currfile
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99 (setq currbuf (find-file-noselect currfile))
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100 (setq currfile (buffer-file-name currbuf)))
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101 (if (or (not currfile) (not currbuf))
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102 nil
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103 (set-buffer currbuf)
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104 (let ((case-fold-search (not no-fold-search)))
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105 (save-excursion
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106 (goto-char (point-min))
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107 (setq firstmatch t)
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108 (while (re-search-forward regexp nil t)
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109 (setq matches (+ matches 1))
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110 (let* ((linenum (count-lines (point-min)(point)))
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111 (tag (format "\n%4d:" linenum)))
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112 (set-buffer occbuf)
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113 (if firstmatch
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114 (progn
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115 (insert moccur-source-prefix currfile "\n")
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116 (setq firstmatch nil)))
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117 (insert tag)
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118 (set-buffer currbuf)
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119 (forward-word -1) ;; needed if match goes to eoline
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120 (beginning-of-line)
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121 (let ((beg (point)))
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122 (end-of-line)
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123 (append-to-buffer occbuf beg (point)))
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124 (forward-line 1)))))
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125 (save-excursion
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126 (set-buffer occbuf)
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127 (if (not firstmatch) (insert "\n\n"))
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128 (if kill-buf (kill-buffer currbuf))))))
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129 (if (> matches 0)
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130 (progn
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131 (set-buffer occbuf)
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132 (moccur-mode)
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133 (if (fboundp 'outline-minor-mode)
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134 (and (progn (goto-char 1)
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135 (search-forward "\C-m" nil t))
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136 (outline-minor-mode 1)))
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137 (goto-char (point-min))
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138 (pop-to-buffer occbuf)
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139 (message "%d matches." matches)
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140 t)
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141 (message "No matches.")
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142 nil)))
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143
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144 (defun moccur-to ()
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145 "Go to the line where this occurrence was found."
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146 (interactive)
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147 (if (not (eq major-mode 'moccur-mode))
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148 (error "'moccur-to' must be called within a moccur buffer.")
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149 (let ((beg nil)
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150 (line nil)
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151 (lineno nil)
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152 (dstbuf nil))
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153 (save-excursion
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154 (beginning-of-line)
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155 (setq beg (point))
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156 (end-of-line)
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157 (setq line (buffer-substring beg (point)))
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158 (if (string-match "^[ ]*[0-9]+:" line)
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159 (progn
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160 (setq lineno (string-to-int (substring
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161 line 0 (match-end 0))))
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162 (if (re-search-backward
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163 (concat "^" moccur-source-prefix
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164 "\"?\\([^\" \n]+\\)\"?") nil t)
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165 (progn
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166 (setq line (buffer-substring
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167 (match-beginning 1) (match-end 1))
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168 dstbuf (find-file-noselect line))
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169 (if (not dstbuf)
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170 (message
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171 "moccur-to: file '%s' is not readable" line)))
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172 (error "No moccur header line for file.")))
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173 (error "Not an moccur occurrence line.")))
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174 (if (and lineno dstbuf)
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175 (progn
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176 (message "Selection <%s> line %d." line lineno)
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177 (pop-to-buffer dstbuf)
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178 (goto-line lineno))))))
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179
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180 (fset 'moccur-mode-goto-occurrence 'moccur-to)
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181
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182
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183 ;;; ************************************************************************
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184 ;;; Private functions
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185 ;;; ************************************************************************
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186
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187 (defun moccur-mode ()
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188 "Major mode for output from \\[moccur].
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189 Move point to one of the occurrences in this buffer,
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190 then use \\[moccur-to] to go to the same occurrence
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191 in the buffer that the occurrenc was found in.
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192 \\{occur-mode-map}"
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193 (kill-all-local-variables)
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194 (use-local-map moccur-mode-map)
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195 (setq major-mode 'moccur-mode)
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196 (setq mode-name "Moccur"))
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197
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198 ;;; ************************************************************************
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199 ;;; Private variables
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200 ;;; ************************************************************************
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201
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202 (defvar moccur-mode-map ())
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203 (if moccur-mode-map
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204 ()
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205 (setq moccur-mode-map (make-sparse-keymap))
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206 (define-key moccur-mode-map "\C-c\C-c" 'moccur-to)
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207 (define-key moccur-mode-map " " 'moccur-to)
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208 (define-key moccur-mode-map "\C-m" 'moccur-to)
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209 )
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210
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211 (provide 'hmoccur)
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