lisp/find-cmd.el

   1 ;;; find-cmd.el --- Build a valid find(1) command with sexps
   2
   3 ;; Copyright (C) 2008-2017 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 <https://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 (require 'grep)
  43
  44 (defconst find-constituents
  45   '((and . find-and)
  46     (not . find-not)
  47     (or  . find-or)
  48
  49     (a . find-and)
  50     (n . find-not)
  51     (o . find-or)
  52
  53     (prune . find-prune)
  54
  55     ;; switches
  56     (L . (0))
  57     (P . (0))
  58     (H . (0))
  59
  60     ;; generic tests
  61     (amin       . (1))
  62     (anewer     . (1))
  63     (atime      . (1))
  64     (cmin       . (1))
  65     (cnewer     . (1))
  66     (ctime      . (1))
  67     (empty      . (0))
  68     (executable . (0))
  69     (false      . (0))
  70     (fstype     . (1))
  71     (gid        . (1))
  72     (group      . (1))
  73     (ilname     . (1))
  74     (iname      . (1))
  75     (inum       . (1))
  76     (ipath      . (1))
  77     (iregex     . (1))
  78     (iwholename . (1))
  79     (links      . (1))
  80     (lname      . (1))
  81     (mmin       . (1))
  82     (mtime      . (1))
  83     (name       . (1))
  84     (newer      . (1))
  85     (nogroup    . (0))
  86     (nouser     . (0))
  87     (path       . (1))
  88     (perm       . (0))
  89     (readable   . (0))
  90     (regex      . (1))
  91     (samefile   . (1))
  92     (size       . (1))
  93     (true       . (0))
  94     (type       . (1))
  95     (uid        . (1))
  96     (used       . (1))
  97     (user       . (1))
  98     (wholename  . (1))
  99     (writable   . (0))
 100     (xtype      . (nil))
 101
 102     ;; normal options (always true)
 103     (daystart              . (0))
 104     (depth                 . (0))
 105     (maxdepth              . (1))
 106     (mindepth              . (1))
 107     (mount                 . (0))
 108     (noleaf                . (0))
 109     (ignore_readdir_race   . (0))
 110     (noignore_readdir_race . (0))
 111     (regextype             . (1))
 112     (xdev                  . (0))
 113
 114     ;; actions
 115     (delete  . (0))
 116     (print0  . (0))
 117     (printf  . (1))
 118     (fprintf . (2))
 119     (print   . (0))
 120     (fprint0 . (1))
 121     (fprint  . (1))
 122     (ls      . (0))
 123     (fls     . (1))
 124     (prune   . (0))
 125     (quit    . (0))
 126
 127     ;; these need to be terminated with a ;
 128     (exec    . (1 find-command t))
 129     (ok      . (1 find-command t))
 130     (execdir . (1 find-command t))
 131     (okdir   . (1 find-command t)))
 132   "Holds details of each of the find options.
 133 The car of each alist is the name.  The cdr is minimum args, the
 134 function used to join many occurrences of the argument together,
 135 and whether or not to leave quotes off the string (non-nil means
 136 the string will be quoted).")
 137
 138 ;;;###autoload
 139 (defun find-cmd (&rest subfinds)
 140   "Initiate the building of a find command.
 141 For example:
 142
 143 \(find-cmd \\='(prune (name \".svn\" \".git\" \".CVS\"))
 144           \\='(and (or (name \"*.pl\" \"*.pm\" \"*.t\")
 145                     (mtime \"+1\"))
 146                 (fstype \"nfs\" \"ufs\"))))
 147
 148 `default-directory' is used as the initial search path.  The
 149 result is a string that should be ready for the command line."
 150   ;; FIXME: Provide a version that returns a list of strings (ready to pass to
 151   ;; call-process).
 152   (concat find-program " "
 153           (shell-quote-argument (expand-file-name default-directory)) " "
 154           (cond
 155            ((cdr subfinds)
 156             (mapconcat #'find-to-string subfinds ""))
 157            (t
 158             (find-to-string (car subfinds))))))
 159
 160 (defun find-and (form)
 161   "And FORMs together, so:
 162   (and (mtime \"+1\") (name \"something\"))
 163 will produce:
 164   find . \\( -mtime +1 -and -name something \\)"
 165   (if (< (length form) 2)
 166       (find-to-string (car form))
 167       (concat "\\( "
 168               (mapconcat #'find-to-string form "-and ")
 169               "\\) ")))
 170
 171 (defun find-or (form)
 172   "Or FORMs together, so:
 173   (or (mtime \"+1\") (name \"something\"))
 174 will produce:
 175   find . \\( -mtime +1 -or -name something \\)"
 176   (if (< (length form) 2)
 177       (find-to-string (car form))
 178       (concat "\\( "
 179               (mapconcat #'find-to-string form "-or ")
 180               "\\) ")))
 181
 182 (defun find-not (form)
 183   "Or FORMs together and prefix with a -not, so:
 184   (not (mtime \"+1\") (name \"something\"))
 185 will produce:
 186   -not \\( -mtime +1 -or -name something \\)
 187 If you wanted the FORMs -and(ed) together instead then this would
 188 suffice:
 189   (not (and (mtime \"+1\") (name \"something\")))"
 190   (concat "-not " (find-or (mapcar #'find-to-string form))))
 191
 192 (defun find-prune (form)
 193   "-or together FORMs postfix `-prune' and then -or that with a
 194 -true, so:
 195   ((prune (name \".svn\" \".git\")) (name \"*.pm\"))
 196 will produce (unwrapped):
 197   \\( \\( \\( -name .svn -or -name .git \\) /
 198   -prune -or -true \\) -and -name *.pm \\)"
 199   (find-or
 200    (list
 201     (concat (find-or (mapcar #'find-to-string form)) (find-generic "prune"))
 202     (find-generic "true"))))
 203
 204 (defun find-generic (option &optional oper argcount args dont-quote)
 205   "Allow an arbitrary string to be used as a form.
 206 OPTION is the name of the form, OPER is the function used to either
 207 OR or AND multiple results together.  ARGCOUNT is the minimum of
 208 args that OPTION can receive and ARGS are the arguments for OPTION.
 209 If DONT-QUOTE is non-nil, arguments are quoted for passing them to
 210 the shell."
 211   (when (and (numberp argcount) (< (length args) argcount))
 212     (error "`%s' needs at least %d arguments" option argcount))
 213   (let ((oper (or oper 'find-or)))
 214     (if (and args (length args))
 215         (funcall oper (mapcar (lambda (x)
 216                                 (concat "-" option
 217                                         (if dont-quote
 218                                             (concat " " x " ")
 219                                             (concat " "
 220                                                     (shell-quote-argument x)
 221                                                     " "))))
 222                               args))
 223         (concat "-" option " "))))
 224
 225 (defun find-command (form)
 226   "For each item in FORM add a terminating semi-colon and turn
 227 them into valid switches.  The result is -and(ed) together."
 228   (find-and (mapcar (lambda (x)
 229                       (concat (find-to-string x) "\\; "))
 230                     form)))
 231
 232 (defun find-to-string (form)
 233   "Parse FORM to produce a set of valid find arguments."
 234   (cond
 235     ((stringp form)
 236      form)
 237     ((consp form)
 238      (let ((option (cdr (assoc (car form) find-constituents))))
 239        (cond
 240          ((and (symbolp option) (fboundp option))
 241           (funcall option (cdr form)))
 242          ((consp option)
 243           (let ((option (symbol-name (car form)))
 244                 (argcnt (car option))
 245                 (oper (cadr option))
 246                 (dont-quote (car (cddr option))))
 247             (find-to-string
 248              (find-generic option oper argcnt (cdr form) dont-quote))))
 249          (t
 250           (error "Sorry I don't know how to handle `%s'" (car form))))))))
 251
 252 (provide 'find-cmd)
 253
 254 ;;; find-cmd.el ends here