find-cmd.el

   1 ;;; find-cmd.el --- Build a valid find(1) command with sexps
   2
   3 ;; Copyright (C) 2008 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     (false      . (0))
  67     (fstype     . (1))
  68     (gid        . (1))
  69     (group      . (1))
  70     (ilname     . (1))
  71     (iname      . (1))
  72     (inum       . (1))
  73     (iwholename . (1))
  74     (iregex     . (1))
  75     (links      . (1))
  76     (lname      . (1))
  77     (mmin       . (1))
  78     (mtime      . (1))
  79     (name       . (1))
  80     (newer      . (1))
  81     (nouser     . (0))
  82     (nogroup    . (0))
  83     (path       . (1))
  84     (perm       . (0))
  85     (regex      . (1))
  86     (wholename  . (1))
  87     (size       . (1))
  88     (true       . (0))
  89     (type       . (1))
  90     (uid        . (1))
  91     (used       . (1))
  92     (user       . (1))
  93     (xtype      . (nil))
  94
  95     ;; normal options (always true)
  96     (depth                 . (0))
  97     (maxdepth              . (1))
  98     (mindepth              . (1))
  99     (mount                 . (0))
 100     (noleaf                . (0))
 101     (xdev                  . (0))
 102     (ignore_readdir_race   . (0))
 103     (noignore_readdir_race . (0))
 104
 105     ;; actions
 106     (delete  . (0))
 107     (print0  . (0))
 108     (printf  . (1))
 109     (fprintf . (2))
 110     (print   . (0))
 111     (fprint0 . (1))
 112     (fprint  . (1))
 113     (ls      . (0))
 114     (fls     . (1))
 115     (prune   . (0))
 116     (quit    . (0))
 117
 118     ;; these need to be terminated with a ;
 119     (exec    . (1 find-command t))
 120     (ok      . (1 find-command t))
 121     (execdir . (1 find-command t))
 122     (okdir   . (1 find-command t)))
 123   "Holds details of each of the find options. The car of each
 124 alist is the name. The cdr is minimum args, the function used
 125 to join many occurences of the argument together, and whether or
 126 not to leave quotes off the string (non-nil means the string will
 127 be quoted).")
 128
 129 ;;;###autoload
 130 (defun find-cmd (&rest subfinds)
 131   "Initiate the building of a find command. For exmple:
 132
 133 \(find-cmd '\(prune \(name \".svn\" \".git\" \".CVS\"\)\)
 134           '\(and \(or \(name \"*.pl\" \"*.pm\" \"*.t\"\)
 135                     \(mtime \"+1\"\)\)
 136                 \(fstype \"nfs\" \"ufs\"\)\)\)\)
 137
 138 `default-directory' is used as the initial search path. The
 139 result is a string that should be ready for the command line."
 140   (concat
 141    "find " (shell-quote-argument (expand-file-name default-directory)) " "
 142            (cond
 143             ((cdr subfinds)
 144              (mapconcat 'find-to-string subfinds ""))
 145             (t
 146              (find-to-string (car subfinds))))))
 147
 148 (defun find-and (form)
 149   "And FORMs together, so:
 150   \(and \(mtime \"+1\"\) \(name \"something\"\)\)
 151 will produce:
 152   find . \\\( -mtime '+1' -and -name 'something' \\\)"
 153   (if (< (length form) 2)
 154       (find-to-string (car form))
 155       (concat "\\( "
 156               (mapconcat 'find-to-string form "-and ")
 157               "\\) ")))
 158
 159 (defun find-or (form)
 160   "Or FORMs together, so:
 161   \(or \(mtime \"+1\"\) \(name \"something\"\)\)
 162 will produce:
 163   find . \\\( -mtime '+1' -or -name 'something' \\\)"
 164   (if (< (length form) 2)
 165       (find-to-string (car form))
 166       (concat "\\( "
 167               (mapconcat 'find-to-string form "-or ")
 168               "\\) ")))
 169
 170 (defun find-not (form)
 171   "Or FORMs together and prefix with a -not, so:
 172   \(not \(mtime \"+1\"\) \(name \"something\"\)\)
 173 will produce:
 174   -not \\\( -mtime '+1' -or -name 'something' \\\)
 175 If you wanted the FORMs -and(ed) together instead then this would
 176 suffice:
 177   \(not \(and \(mtime \"+1\"\) \(name \"something\"\)\)\)"
 178   (concat "-not " (find-or (mapcar 'find-to-string form))))
 179
 180 (defun find-prune (form)
 181   "-or together FORM(s) postfix '-prune' and then -or that with a
 182 -true, so:
 183   \(prune \(name \".svn\" \".git\"\)\) \(name \"*.pm\"\)
 184 will produce (unwrapped):
 185   \\\( \\\( \\\( -name '.svn' -or -name '.git' \\\) /
 186   -prune -or -true \\\) -and -name '*.pm' \\\)"
 187   (find-or
 188    (list
 189     (concat (find-or (mapcar 'find-to-string form)) (find-generic "prune"))
 190     (find-generic "true"))))
 191
 192 (defun find-generic (option &optional oper argcount args dont-quote)
 193   "This function allows an arbitrary string to be used as a
 194 form. OPTION is the name of the form, OPER is the function used
 195 to either OR or AND multiple results together. ARGCOUNT is the
 196 minimum of args that OPTION can receive and ARGS are the
 197 arguments for OPTION."
 198   (when (and (numberp argcount) (< (length args) argcount))
 199     (error "'%s' needs at least %d arguments" option argcount))
 200   (let ((oper (or oper 'find-or)))
 201     (if (and args (length args))
 202         (funcall oper (mapcar (lambda (x)
 203                                 (concat "-" option
 204                                         (if dont-quote
 205                                             (concat " " x " ")
 206                                             (concat " "
 207                                                     (shell-quote-argument x)
 208                                                     " "))))
 209                               args))
 210         (concat "-" option " "))))
 211
 212 (defun find-command (form)
 213   "For each item in FORM add a terminating semi-colon and turn
 214 them into valid switches. The result is -and(ed) together."
 215   (find-and (mapcar (lambda (x)
 216                       (concat (find-to-string x) "\\; "))
 217                     form)))
 218
 219 (defun find-to-string (form)
 220   "Parse FORM to produce a set of valid find arguments."
 221   (cond
 222     ((stringp form)
 223      form)
 224     ((consp form)
 225      (let ((option (cdr (assoc (car form) find-constituents))))
 226        (cond
 227          ((and (symbolp option) (fboundp option))
 228           (funcall option (cdr form)))
 229          ((consp option)
 230           (let ((option (symbol-name (car form)))
 231                 (argcnt (car option))
 232                 (oper (cadr option))
 233                 (dont-quote (car (cddr option))))
 234             (find-to-string
 235              (find-generic option oper argcnt (cdr form) dont-quote))))
 236          (t
 237           (error "Sorry I don't know how to handle '%s'" (car form))))))))
 238
 239 (provide 'find-cmd)
 240
 241 ;; arch-tag: 9687fd9e-4e90-4022-864a-f904526e2046
 242 ;;; find-cmd.el ends here