summaryrefslogtreecommitdiff
path: root/lisp/find-cmd.el
blob: 13b41165d067c2a2a29bf11f50bebc0c794f3ee5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
;;; find-cmd.el --- Build a valid find(1) command with sexps

;; Copyright (C) 2008-2020 Free Software Foundation, Inc.

;; Author: Philip Jackson <phil@shellarchive.co.uk>
;; Version: 0.6

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;; With this module you can build up a (hopefully) valid find(1)
;; string ready for the command line.  For example:

;; (find-cmd '(prune (name ".svn" ".git" ".CVS"))
;;           '(and (or (name "*.pl" "*.pm" "*.t")
;;                     (mtime "+1"))
;;                 (fstype "nfs" "ufs"))))

;; will become (un-wrapped):

;;     "find '/home/phil/' \\( \\( -name '.svn' -or -name '.git' -or
;;      -name '.CVS' \\) -prune -or -true \\) \\( \\( \\( -name '*.pl'
;;      -or -name '*.pm' -or -name '*.t' \\) -or -mtime '+1' \\) -and \\(
;;      -fstype 'nfs' -or -fstype 'ufs' \\) \\)"

;;; Code:

(require 'grep)

(defconst find-constituents
  '((and . find-and)
    (not . find-not)
    (or  . find-or)

    (a . find-and)
    (n . find-not)
    (o . find-or)

    (prune . find-prune)

    ;; switches
    (L . (0))
    (P . (0))
    (H . (0))

    ;; generic tests
    (amin       . (1))
    (anewer     . (1))
    (atime      . (1))
    (cmin       . (1))
    (cnewer     . (1))
    (ctime      . (1))
    (empty      . (0))
    (executable . (0))
    (false      . (0))
    (fstype     . (1))
    (gid        . (1))
    (group      . (1))
    (ilname     . (1))
    (iname      . (1))
    (inum       . (1))
    (ipath      . (1))
    (iregex     . (1))
    (iwholename . (1))
    (links      . (1))
    (lname      . (1))
    (mmin       . (1))
    (mtime      . (1))
    (name       . (1))
    (newer      . (1))
    (nogroup    . (0))
    (nouser     . (0))
    (path       . (1))
    (perm       . (0))
    (readable   . (0))
    (regex      . (1))
    (samefile   . (1))
    (size       . (1))
    (true       . (0))
    (type       . (1))
    (uid        . (1))
    (used       . (1))
    (user       . (1))
    (wholename  . (1))
    (writable   . (0))
    (xtype      . (nil))

    ;; normal options (always true)
    (daystart              . (0))
    (depth                 . (0))
    (maxdepth              . (1))
    (mindepth              . (1))
    (mount                 . (0))
    (noleaf                . (0))
    (ignore_readdir_race   . (0))
    (noignore_readdir_race . (0))
    (regextype             . (1))
    (xdev                  . (0))

    ;; actions
    (delete  . (0))
    (print0  . (0))
    (printf  . (1))
    (fprintf . (2))
    (print   . (0))
    (fprint0 . (1))
    (fprint  . (1))
    (ls      . (0))
    (fls     . (1))
    (prune   . (0))
    (quit    . (0))

    ;; these need to be terminated with a ;
    (exec    . (1 find-command t))
    (ok      . (1 find-command t))
    (execdir . (1 find-command t))
    (okdir   . (1 find-command t)))
  "Holds details of each of the find options.
The car of each alist is the name.  The cdr is minimum args, the
function used to join many occurrences of the argument together,
and whether or not to leave quotes off the string (non-nil means
the string will be quoted).")

;;;###autoload
(defun find-cmd (&rest subfinds)
  "Initiate the building of a find command.
For example:

\(find-cmd \\='(prune (name \".svn\" \".git\" \".CVS\"))
          \\='(and (or (name \"*.pl\" \"*.pm\" \"*.t\")
                    (mtime \"+1\"))
                (fstype \"nfs\" \"ufs\"))))

`default-directory' is used as the initial search path.  The
result is a string that should be ready for the command line."
  ;; FIXME: Provide a version that returns a list of strings (ready to pass to
  ;; call-process).
  (concat find-program " "
          (shell-quote-argument (expand-file-name default-directory)) " "
          (cond
           ((cdr subfinds)
            (mapconcat #'find-to-string subfinds ""))
           (t
            (find-to-string (car subfinds))))))

(defun find-and (form)
  "And FORMs together, so:
  (and (mtime \"+1\") (name \"something\"))
will produce:
  find . \\( -mtime +1 -and -name something \\)"
  (if (< (length form) 2)
      (find-to-string (car form))
      (concat "\\( "
              (mapconcat #'find-to-string form "-and ")
              "\\) ")))

(defun find-or (form)
  "Or FORMs together, so:
  (or (mtime \"+1\") (name \"something\"))
will produce:
  find . \\( -mtime +1 -or -name something \\)"
  (if (< (length form) 2)
      (find-to-string (car form))
      (concat "\\( "
              (mapconcat #'find-to-string form "-or ")
              "\\) ")))

(defun find-not (form)
  "Or FORMs together and prefix with a -not, so:
  (not (mtime \"+1\") (name \"something\"))
will produce:
  -not \\( -mtime +1 -or -name something \\)
If you wanted the FORMs -and(ed) together instead then this would
suffice:
  (not (and (mtime \"+1\") (name \"something\")))"
  (concat "-not " (find-or (mapcar #'find-to-string form))))

(defun find-prune (form)
  "-or together FORMs postfix `-prune' and then -or that with a
-true, so:
  ((prune (name \".svn\" \".git\")) (name \"*.pm\"))
will produce (unwrapped):
  \\( \\( \\( -name .svn -or -name .git \\) /
  -prune -or -true \\) -and -name *.pm \\)"
  (find-or
   (list
    (concat (find-or (mapcar #'find-to-string form)) (find-generic "prune"))
    (find-generic "true"))))

(defun find-generic (option &optional oper argcount args dont-quote)
  "Allow an arbitrary string to be used as a form.
OPTION is the name of the form, OPER is the function used to either
OR or AND multiple results together.  ARGCOUNT is the minimum of
args that OPTION can receive and ARGS are the arguments for OPTION.
If DONT-QUOTE is non-nil, arguments are quoted for passing them to
the shell."
  (when (and (numberp argcount) (< (length args) argcount))
    (error "`%s' needs at least %d arguments" option argcount))
  (let ((oper (or oper 'find-or)))
    (if (and args (length args))
        (funcall oper (mapcar (lambda (x)
                                (concat "-" option
                                        (if dont-quote
                                            (concat " " x " ")
                                            (concat " "
                                                    (shell-quote-argument x)
                                                    " "))))
                              args))
        (concat "-" option " "))))

(defun find-command (form)
  "For each item in FORM add a terminating semi-colon and turn
them into valid switches.  The result is -and(ed) together."
  (find-and (mapcar (lambda (x)
                      (concat (find-to-string x) "\\; "))
                    form)))

(defun find-to-string (form)
  "Parse FORM to produce a set of valid find arguments."
  (cond
    ((stringp form)
     form)
    ((consp form)
     (let ((option (cdr (assoc (car form) find-constituents))))
       (cond
         ((and (symbolp option) (fboundp option))
          (funcall option (cdr form)))
         ((consp option)
          (let ((option (symbol-name (car form)))
                (argcnt (car option))
                (oper (cadr option))
                (dont-quote (car (cddr option))))
            (find-to-string
             (find-generic option oper argcnt (cdr form) dont-quote))))
         (t
          (error "Sorry I don't know how to handle `%s'" (car form))))))))

(provide 'find-cmd)

;;; find-cmd.el ends here