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60370d40 | 1 | ;;; esh-ext.el --- commands external to Eshell |
affbf647 | 2 | |
5fd6d89f TTN |
3 | ;; Copyright (C) 1999, 2000, 2002, 2003, 2004, |
4 | ;; 2005 Free Software Foundation, Inc. | |
affbf647 | 5 | |
7de5b421 GM |
6 | ;; Author: John Wiegley <johnw@gnu.org> |
7 | ||
affbf647 GM |
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 2, or (at your option) | |
13 | ;; 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; see the file COPYING. If not, write to the | |
3a35cf56 LK |
22 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
23 | ;; Boston, MA 02110-1301, USA. | |
affbf647 GM |
24 | |
25 | (provide 'esh-ext) | |
26 | ||
27 | (eval-when-compile (require 'esh-maint)) | |
d3f92b4b | 28 | (require 'esh-util) |
affbf647 GM |
29 | |
30 | (defgroup eshell-ext nil | |
31 | "External commands are invoked when operating system executables are | |
32 | loaded into memory, thus beginning a new process." | |
33 | :tag "External commands" | |
34 | :group 'eshell) | |
35 | ||
36 | ;;; Commentary: | |
37 | ||
38 | ;; To force a command to invoked external, either provide an explicit | |
39 | ;; pathname for the command argument, or prefix the command name with | |
40 | ;; an asterix character. Example: | |
41 | ;; | |
42 | ;; grep ; make invoke `grep' Lisp function, or `eshell/grep' | |
43 | ;; /bin/grep ; will definitely invoke /bin/grep | |
44 | ;; *grep ; will also invoke /bin/grep | |
45 | ||
46 | ;;; User Variables: | |
47 | ||
48 | (defcustom eshell-ext-load-hook '(eshell-ext-initialize) | |
49 | "*A hook that gets run when `eshell-ext' is loaded." | |
50 | :type 'hook | |
51 | :group 'eshell-ext) | |
52 | ||
194c8d98 | 53 | (defcustom eshell-binary-suffixes exec-suffixes |
affbf647 GM |
54 | "*A list of suffixes used when searching for executable files." |
55 | :type '(repeat string) | |
56 | :group 'eshell-ext) | |
57 | ||
58 | (defcustom eshell-force-execution nil | |
59 | "*If non-nil, try to execute binary files regardless of permissions. | |
60 | This can be useful on systems like Windows, where the operating system | |
61 | doesn't happen to honor the permission bits in certain cases; or in | |
62 | cases where you want to associate an interpreter with a particular | |
63 | kind of script file, but the language won't let you but a '#!' | |
64 | interpreter line in the file, and you don't want to make it executable | |
65 | since nothing else but Eshell will be able to understand | |
66 | `eshell-interpreter-alist'." | |
67 | :type 'boolean | |
68 | :group 'eshell-ext) | |
69 | ||
70 | (defun eshell-search-path (name) | |
71 | "Search the environment path for NAME." | |
72 | (if (file-name-absolute-p name) | |
73 | name | |
74 | (let ((list (parse-colon-path (getenv "PATH"))) | |
75 | suffixes n1 n2 file) | |
76 | (while list | |
77 | (setq n1 (concat (car list) name)) | |
78 | (setq suffixes eshell-binary-suffixes) | |
79 | (while suffixes | |
80 | (setq n2 (concat n1 (car suffixes))) | |
81 | (if (and (or (file-executable-p n2) | |
82 | (and eshell-force-execution | |
83 | (file-readable-p n2))) | |
84 | (not (file-directory-p n2))) | |
85 | (setq file n2 suffixes nil list nil)) | |
86 | (setq suffixes (cdr suffixes))) | |
87 | (setq list (cdr list))) | |
88 | file))) | |
89 | ||
90 | (defcustom eshell-windows-shell-file | |
91 | (if (eshell-under-windows-p) | |
92 | (if (string-match "\\(\\`cmdproxy\\|sh\\)\\.\\(com\\|exe\\)" | |
93 | shell-file-name) | |
94 | (or (eshell-search-path "cmd.exe") | |
b0c9a334 | 95 | (eshell-search-path "command.com")) |
affbf647 GM |
96 | shell-file-name)) |
97 | "*The name of the shell command to use for DOS/Windows batch files. | |
98 | This defaults to nil on non-Windows systems, where this variable is | |
99 | wholly ignored." | |
f569d4c4 | 100 | :type '(choice file (const nil)) |
affbf647 GM |
101 | :group 'eshell-ext) |
102 | ||
103 | (defsubst eshell-invoke-batch-file (&rest args) | |
104 | "Invoke a .BAT or .CMD file on DOS/Windows systems." | |
105 | ;; since CMD.EXE can't handle forward slashes in the initial | |
106 | ;; argument... | |
6b0e3e4d | 107 | (setcar args (subst-char-in-string ?/ ?\\ (car args))) |
affbf647 | 108 | (throw 'eshell-replace-command |
ca7aae91 | 109 | (eshell-parse-command eshell-windows-shell-file (cons "/c" args)))) |
affbf647 GM |
110 | |
111 | (defcustom eshell-interpreter-alist | |
112 | (if (eshell-under-windows-p) | |
113 | '(("\\.\\(bat\\|cmd\\)\\'" . eshell-invoke-batch-file))) | |
114 | "*An alist defining interpreter substitutions. | |
115 | Each member is a cons cell of the form: | |
116 | ||
117 | (MATCH . INTERPRETER) | |
118 | ||
119 | MATCH should be a regexp, which is matched against the command name, | |
120 | or a function. If either returns a non-nil value, then INTERPRETER | |
121 | will be used for that command. | |
122 | ||
123 | If INTERPRETER is a string, it will be called as the command name, | |
124 | with the original command name passed as the first argument, with all | |
125 | subsequent arguments following. If INTERPRETER is a function, it will | |
126 | be called with all of those arguments. Note that interpreter | |
127 | functions should throw `eshell-replace-command' with the alternate | |
128 | command form, or they should return a value compatible with the | |
129 | possible return values of `eshell-external-command', which see." | |
130 | :type '(repeat (cons (choice regexp (function :tag "Predicate")) | |
131 | (choice string (function :tag "Interpreter")))) | |
132 | :group 'eshell-ext) | |
133 | ||
134 | (defcustom eshell-alternate-command-hook nil | |
135 | "*A hook run whenever external command lookup fails. | |
136 | If a functions wishes to provide an alternate command, they must throw | |
137 | it using the tag `eshell-replace-command'. This is done because the | |
138 | substituted command need not be external at all, and therefore must be | |
139 | passed up to a higher level for re-evaluation. | |
140 | ||
141 | Or, if the function returns a filename, that filename will be invoked | |
142 | with the current command arguments rather than the command specified | |
143 | by the user on the command line." | |
144 | :type 'hook | |
145 | :group 'eshell-ext) | |
146 | ||
147 | (defcustom eshell-command-interpreter-max-length 256 | |
148 | "*The maximum length of any command interpreter string, plus args." | |
149 | :type 'integer | |
150 | :group 'eshell-ext) | |
151 | ||
1228240f JW |
152 | (defcustom eshell-explicit-command-char ?* |
153 | "*If this char occurs before a command name, call it externally. | |
451eaf8d RS |
154 | That is, although `vi' may be an alias, `\vi' will always call the |
155 | external version." | |
1228240f JW |
156 | :type 'character |
157 | :group 'eshell-ext) | |
158 | ||
affbf647 GM |
159 | ;;; Functions: |
160 | ||
161 | (defun eshell-ext-initialize () | |
162 | "Initialize the external command handling code." | |
affbf647 GM |
163 | (add-hook 'eshell-named-command-hook 'eshell-explicit-command nil t)) |
164 | ||
165 | (defun eshell-explicit-command (command args) | |
166 | "If a command name begins with `*', call it externally always. | |
167 | This bypasses all Lisp functions and aliases." | |
168 | (when (and (> (length command) 1) | |
1228240f | 169 | (eq (aref command 0) eshell-explicit-command-char)) |
affbf647 GM |
170 | (let ((cmd (eshell-search-path (substring command 1)))) |
171 | (if cmd | |
172 | (or (eshell-external-command cmd args) | |
173 | (error "%s: external command failed" cmd)) | |
174 | (error "%s: external command not found" | |
175 | (substring command 1)))))) | |
176 | ||
177 | (defun eshell-remote-command (handler command args) | |
178 | "Insert output from a remote COMMAND, using ARGS. | |
179 | A remote command is something that executes on a different machine. | |
180 | An external command simply means external to Emacs. | |
181 | ||
182 | Note that this function is very crude at the moment. It gathers up | |
183 | all the output from the remote command, and sends it all at once, | |
184 | causing the user to wonder if anything's really going on..." | |
185 | (let ((outbuf (generate-new-buffer " *eshell remote output*")) | |
186 | (errbuf (generate-new-buffer " *eshell remote error*")) | |
187 | (exitcode 1)) | |
188 | (unwind-protect | |
189 | (progn | |
190 | (setq exitcode | |
191 | (funcall handler 'shell-command | |
192 | (mapconcat 'shell-quote-argument | |
193 | (append (list command) args) " ") | |
194 | outbuf errbuf)) | |
195 | (eshell-print (save-excursion (set-buffer outbuf) | |
196 | (buffer-string))) | |
197 | (eshell-error (save-excursion (set-buffer errbuf) | |
198 | (buffer-string)))) | |
199 | (eshell-close-handles exitcode 'nil) | |
200 | (kill-buffer outbuf) | |
201 | (kill-buffer errbuf)))) | |
202 | ||
203 | (defun eshell-external-command (command args) | |
204 | "Insert output from an external COMMAND, using ARGS." | |
205 | (setq args (eshell-stringify-list (eshell-flatten-list args))) | |
206 | (let ((handler | |
207 | (unless (or (equal default-directory "/") | |
208 | (and (eshell-under-windows-p) | |
209 | (string-match "\\`[A-Za-z]:[/\\\\]\\'" | |
210 | default-directory))) | |
211 | (find-file-name-handler default-directory | |
212 | 'shell-command)))) | |
d1665336 JW |
213 | (if (and handler |
214 | (not (and (eshell-under-xemacs-p) | |
215 | (eq handler 'dired-handler-fn)))) | |
affbf647 GM |
216 | (eshell-remote-command handler command args)) |
217 | (let ((interp (eshell-find-interpreter command))) | |
218 | (assert interp) | |
219 | (if (functionp (car interp)) | |
220 | (apply (car interp) (append (cdr interp) args)) | |
221 | (eshell-gather-process-output | |
222 | (car interp) (append (cdr interp) args)))))) | |
223 | ||
224 | (defun eshell/addpath (&rest args) | |
225 | "Add a set of paths to PATH." | |
226 | (eshell-eval-using-options | |
227 | "addpath" args | |
228 | '((?b "begin" nil prepend "add path element at beginning") | |
229 | (?h "help" nil nil "display this usage message") | |
230 | :usage "[-b] PATH | |
231 | Adds the given PATH to $PATH.") | |
232 | (if args | |
233 | (progn | |
234 | (if prepend | |
235 | (setq args (nreverse args))) | |
236 | (while args | |
237 | (setenv "PATH" | |
238 | (if prepend | |
239 | (concat (car args) path-separator | |
240 | (getenv "PATH")) | |
241 | (concat (getenv "PATH") path-separator | |
242 | (car args)))) | |
243 | (setq args (cdr args)))) | |
244 | (let ((paths (parse-colon-path (getenv "PATH")))) | |
245 | (while paths | |
246 | (eshell-printn (car paths)) | |
247 | (setq paths (cdr paths))))))) | |
248 | ||
127fd3c2 JW |
249 | (put 'eshell/addpath 'eshell-no-numeric-conversions t) |
250 | ||
affbf647 GM |
251 | (defun eshell-script-interpreter (file) |
252 | "Extract the script to run from FILE, if it has #!<interp> in it. | |
253 | Return nil, or a list of the form: | |
254 | ||
255 | (INTERPRETER [ARGS] FILE)" | |
256 | (let ((maxlen eshell-command-interpreter-max-length)) | |
257 | (if (and (file-readable-p file) | |
258 | (file-regular-p file)) | |
259 | (with-temp-buffer | |
260 | (insert-file-contents-literally file nil 0 maxlen) | |
30104690 | 261 | (if (looking-at "#![ \t]*\\([^ \r\t\n]+\\)\\([ \t]+\\(.+\\)\\)?") |
affbf647 GM |
262 | (if (match-string 3) |
263 | (list (match-string 1) | |
264 | (match-string 3) | |
265 | file) | |
266 | (list (match-string 1) | |
267 | file))))))) | |
268 | ||
269 | (defun eshell-find-interpreter (file &optional no-examine-p) | |
270 | "Find the command interpreter with which to execute FILE. | |
271 | If NO-EXAMINE-P is non-nil, FILE will not be inspected for a script | |
272 | line of the form #!<interp>." | |
273 | (let ((finterp | |
274 | (catch 'found | |
275 | (ignore | |
276 | (eshell-for possible eshell-interpreter-alist | |
277 | (cond | |
278 | ((functionp (car possible)) | |
279 | (and (funcall (car possible) file) | |
280 | (throw 'found (cdr possible)))) | |
281 | ((stringp (car possible)) | |
282 | (and (string-match (car possible) file) | |
283 | (throw 'found (cdr possible)))) | |
284 | (t | |
285 | (error "Invalid interpreter-alist test")))))))) | |
286 | (if finterp ; first check | |
287 | (list finterp file) | |
288 | (let ((fullname (if (file-name-directory file) file | |
289 | (eshell-search-path file))) | |
290 | (suffixes eshell-binary-suffixes)) | |
291 | (if (and fullname (not (or eshell-force-execution | |
292 | (file-executable-p fullname)))) | |
293 | (while suffixes | |
294 | (let ((try (concat fullname (car suffixes)))) | |
295 | (if (or (file-executable-p try) | |
296 | (and eshell-force-execution | |
297 | (file-readable-p try))) | |
298 | (setq fullname try suffixes nil) | |
299 | (setq suffixes (cdr suffixes)))))) | |
300 | (cond ((not (and fullname (file-exists-p fullname))) | |
301 | (let ((name (or fullname file))) | |
302 | (unless (setq fullname | |
303 | (run-hook-with-args-until-success | |
304 | 'eshell-alternate-command-hook file)) | |
305 | (error "%s: command not found" name)))) | |
306 | ((not (or eshell-force-execution | |
307 | (file-executable-p fullname))) | |
308 | (error "%s: Permission denied" fullname))) | |
309 | (let (interp) | |
310 | (unless no-examine-p | |
311 | (setq interp (eshell-script-interpreter fullname)) | |
312 | (if interp | |
313 | (setq interp | |
314 | (cons (car (eshell-find-interpreter (car interp) t)) | |
315 | (cdr interp))))) | |
316 | (or interp (list fullname))))))) | |
317 | ||
318 | ;;; Code: | |
319 | ||
ab5796a9 | 320 | ;;; arch-tag: 178d4064-7e60-4745-b81f-bab5d8d7c40f |
affbf647 | 321 | ;;; esh-ext.el ends here |