lisp/find-cmd.el

   1 ;;; find-cmd.el --- Build a valid find(1) command with sexps
   2
   3 ;; Copyright (C) 2008-2013 Free Software Foundation, Inc.
   4
   5 ;; Author: Philip Jackson <phil@shellarchive.co.uk>
   6 ;; Version: 0.6
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;; With this module you can build up a (hopefully) valid find(1)
  26 ;; string ready for the command line.  For example:
  27
  28 ;; (find-cmd '(prune (name ".svn" ".git" ".CVS"))
  29 ;;           '(and (or (name "*.pl" "*.pm" "*.t")
  30 ;;                     (mtime "+1"))
  31 ;;                 (fstype "nfs" "ufs"))))
  32
  33 ;; will become (un-wrapped):
  34
  35 ;;     "find '/home/phil/' \\( \\( -name '.svn' -or -name '.git' -or
  36 ;;      -name '.CVS' \\) -prune -or -true \\) \\( \\( \\( -name '*.pl'
  37 ;;      -or -name '*.pm' -or -name '*.t' \\) -or -mtime '+1' \\) -and \\(
  38 ;;      -fstype 'nfs' -or -fstype 'ufs' \\) \\)"
  39
  40 ;;; Code:
  41
  42 (defconst find-constituents
  43   '((and . find-and)
  44     (not . find-not)
  45     (or  . find-or)
  46
  47     (a . find-and)
  48     (n . find-not)
  49     (o . find-or)
  50
  51     (prune . find-prune)
  52
  53     ;; switches
  54     (L . (0))
  55     (P . (0))
  56     (H . (0))
  57
  58     ;; generic tests
  59     (amin       . (1))
  60     (anewer     . (1))
  61     (atime      . (1))
  62     (cmin       . (1))
  63     (cnewer     . (1))
  64     (ctime      . (1))
  65     (empty      . (0))
  66     (executable . (0))
  67     (false      . (0))
  68     (fstype     . (1))
  69     (gid        . (1))
  70     (group      . (1))
  71     (ilname     . (1))
  72     (iname      . (1))
  73     (inum       . (1))
  74     (ipath      . (1))
  75     (iregex     . (1))
  76     (iwholename . (1))
  77     (links      . (1))
  78     (lname      . (1))
  79     (mmin       . (1))
  80     (mtime      . (1))
  81     (name       . (1))
  82     (newer      . (1))
  83     (nogroup    . (0))
  84     (nouser     . (0))
  85     (path       . (1))
  86     (perm       . (0))
  87     (readable   . (0))
  88     (regex      . (1))
  89     (samefile   . (1))
  90     (size       . (1))
  91     (true       . (0))
  92     (type       . (1))
  93     (uid        . (1))
  94     (used       . (1))
  95     (user       . (1))
  96     (wholename  . (1))
  97     (writable   . (0))
  98     (xtype      . (nil))
  99
 100     ;; normal options (always true)
 101     (daystart              . (0))
 102     (depth                 . (0))
 103     (maxdepth              . (1))
 104     (mindepth              . (1))
 105     (mount                 . (0))
 106     (noleaf                . (0))
 107     (ignore_readdir_race   . (0))
 108     (noignore_readdir_race . (0))
 109     (regextype             . (1))
 110     (xdev                  . (0))
 111
 112     ;; actions
 113     (delete  . (0))
 114     (print0  . (0))
 115     (printf  . (1))
 116     (fprintf . (2))
 117     (print   . (0))
 118     (fprint0 . (1))
 119     (fprint  . (1))
 120     (ls      . (0))
 121     (fls     . (1))
 122     (prune   . (0))
 123     (quit    . (0))
 124
 125     ;; these need to be terminated with a ;
 126     (exec    . (1 find-command t))
 127     (ok      . (1 find-command t))
 128     (execdir . (1 find-command t))
 129     (okdir   . (1 find-command t)))
 130   "Holds details of each of the find options.
 131 The car of each alist is the name.  The cdr is minimum args, the
 132 function used to join many occurrences of the argument together,
 133 and whether or not to leave quotes off the string (non-nil means
 134 the string will be quoted).")
 135
 136 ;;;###autoload
 137 (defun find-cmd (&rest subfinds)
 138   "Initiate the building of a find command.
 139 For example:
 140
 141 \(find-cmd '\(prune \(name \".svn\" \".git\" \".CVS\"\)\)
 142           '\(and \(or \(name \"*.pl\" \"*.pm\" \"*.t\"\)
 143                     \(mtime \"+1\"\)\)
 144                 \(fstype \"nfs\" \"ufs\"\)\)\)\)
 145
 146 `default-directory' is used as the initial search path.  The
 147 result is a string that should be ready for the command line."
 148   (concat
 149    "find " (shell-quote-argument (expand-file-name default-directory)) " "
 150            (cond
 151             ((cdr subfinds)
 152              (mapconcat 'find-to-string subfinds ""))
 153             (t
 154              (find-to-string (car subfinds))))))
 155
 156 (defun find-and (form)
 157   "And FORMs together, so:
 158   \(and \(mtime \"+1\"\) \(name \"something\"\)\)
 159 will produce:
 160   find . \\\( -mtime '+1' -and -name 'something' \\\)"
 161   (if (< (length form) 2)
 162       (find-to-string (car form))
 163       (concat "\\( "
 164               (mapconcat 'find-to-string form "-and ")
 165               "\\) ")))
 166
 167 (defun find-or (form)
 168   "Or FORMs together, so:
 169   \(or \(mtime \"+1\"\) \(name \"something\"\)\)
 170 will produce:
 171   find . \\\( -mtime '+1' -or -name 'something' \\\)"
 172   (if (< (length form) 2)
 173       (find-to-string (car form))
 174       (concat "\\( "
 175               (mapconcat 'find-to-string form "-or ")
 176               "\\) ")))
 177
 178 (defun find-not (form)
 179   "Or FORMs together and prefix with a -not, so:
 180   \(not \(mtime \"+1\"\) \(name \"something\"\)\)
 181 will produce:
 182   -not \\\( -mtime '+1' -or -name 'something' \\\)
 183 If you wanted the FORMs -and(ed) together instead then this would
 184 suffice:
 185   \(not \(and \(mtime \"+1\"\) \(name \"something\"\)\)\)"
 186   (concat "-not " (find-or (mapcar 'find-to-string form))))
 187
 188 (defun find-prune (form)
 189   "-or together FORMs postfix '-prune' and then -or that with a
 190 -true, so:
 191   \(prune \(name \".svn\" \".git\"\)\) \(name \"*.pm\"\)
 192 will produce (unwrapped):
 193   \\\( \\\( \\\( -name '.svn' -or -name '.git' \\\) /
 194   -prune -or -true \\\) -and -name '*.pm' \\\)"
 195   (find-or
 196    (list
 197     (concat (find-or (mapcar 'find-to-string form)) (find-generic "prune"))
 198     (find-generic "true"))))
 199
 200 (defun find-generic (option &optional oper argcount args dont-quote)
 201   "Allow an arbitrary string to be used as a form.
 202 OPTION is the name of the form, OPER is the function used to either
 203 OR or AND multiple results together.  ARGCOUNT is the minimum of
 204 args that OPTION can receive and ARGS are the arguments for OPTION.
 205 If DONT-QUOTE is non-nil, arguments are quoted for passing them to
 206 the shell."
 207   (when (and (numberp argcount) (< (length args) argcount))
 208     (error "'%s' needs at least %d arguments" option argcount))
 209   (let ((oper (or oper 'find-or)))
 210     (if (and args (length args))
 211         (funcall oper (mapcar (lambda (x)
 212                                 (concat "-" option
 213                                         (if dont-quote
 214                                             (concat " " x " ")
 215                                             (concat " "
 216                                                     (shell-quote-argument x)
 217                                                     " "))))
 218                               args))
 219         (concat "-" option " "))))
 220
 221 (defun find-command (form)
 222   "For each item in FORM add a terminating semi-colon and turn
 223 them into valid switches.  The result is -and(ed) together."
 224   (find-and (mapcar (lambda (x)
 225                       (concat (find-to-string x) "\\; "))
 226                     form)))
 227
 228 (defun find-to-string (form)
 229   "Parse FORM to produce a set of valid find arguments."
 230   (cond
 231     ((stringp form)
 232      form)
 233     ((consp form)
 234      (let ((option (cdr (assoc (car form) find-constituents))))
 235        (cond
 236          ((and (symbolp option) (fboundp option))
 237           (funcall option (cdr form)))
 238          ((consp option)
 239           (let ((option (symbol-name (car form)))
 240                 (argcnt (car option))
 241                 (oper (cadr option))
 242                 (dont-quote (car (cddr option))))
 243             (find-to-string
 244              (find-generic option oper argcnt (cdr form) dont-quote))))
 245          (t
 246           (error "Sorry I don't know how to handle '%s'" (car form))))))))
 247
 248 (provide 'find-cmd)
 249
 250 ;;; find-cmd.el ends here