1;; This file is part of GNU Emacs.
2;; Copyright (C) 1998 William F. Schelter
3
4;; GNU Emacs is distributed in the hope that it will be useful, but
5;; WITHOUT ANY WARRANTY.  No author or distributor accepts responsibility
6;; to anyone for the consequences of using it or for whether it serves
7;; any particular purpose or works at all, unless he says so in writing.
8;; Refer to the GNU Emacs General Public License for full details.
9
10;; Everyone is granted permission to copy, modify and redistribute GNU
11;; Emacs, but only under the conditions described in the GNU Emacs
12;; General Public License.  A copy of this license is supposed to have
13;; been given to you along with GNU Emacs so you can know your rights and
14;; responsibilities.  It should be in a file named COPYING.  Among other
15;; things, the copyright notice and this notice must be preserved on all
16;; copies.
17
18
19
20;; By Bill Schelter wfs@math.utexas.edu
21
22;; Completion on forms in the buffer.   Does either a line or an sexp.
23;; Uses the current prompt and the beginning of what you have typed.
24;; Thus If the buffer contained
25
26;; (dbm:3) load("jo"
27;; (C11) lo("ji")
28;; (gdb) last
29;; maxima>>4
30;; /home/bil# ls
31;; then if you are at a prompt
32;; "(C15) l"  would match lo("ji")  only, not "last", not "ls" nor load("
33;; and the commands with the (gdb) prompt would only match ones
34;; starting with (gdb) ..
35
36
37;; also if the command is a lisp sexp and this would be longer than the
38;; current line, it grabs the whole thing.  sometimes we have different
39;; prompts, for different programs and we don't want to confuse the input
40;; from one with input for another.  Generally the prompt matches a
41;; previous prompt, with numbers matching any number, and if there are
42;; '/' then match anything up to a shell prompt terminator.  Note it does
43;; this without additional consing or building up huge lists of inputs.
44
45
46(if (boundp 'comint-mode-map)
47    (define-key comint-mode-map "\ep" 'smart-complete)
48  )
49
50(if (boundp 'sshell-mode-map)
51    (define-key sshell-mode-map "\ep" 'smart-complete)
52   (define-key sshell-mode-map "\M-p" 'smart-complete)
53  )
54
55(defun get-match-n (i )
56  (buffer-substring (match-beginning i) (match-end i)))
57
58(defun smart-complete ()
59  "Begin to type the command and then type M-p.  You will be
60 offered in the minibuffer a succession of choices, which
61 you can say 'n' to to get the next one, or 'y' or 'space'
62 to grab the current one.
63
64 Thus to get the last command starting with 'li' you type
65 liM-py
66"
67  (interactive )
68  (let ((point (point)) new str tem prompt)
69  (save-excursion
70    (beginning-of-line)
71    (cond ((looking-at sshell-prompt-pattern)
72	   (setq prompt (get-match-n 0))
73	   (setq str (buffer-substring (match-end 0) point)))
74	  (t (error "Your prompt on this line does not match sshell-prompt-pattern")))
75
76    (setq new (smart-complete2 prompt str))
77    )
78  (cond (new
79	 (delete-region (setq tem (- point (length str))) point)
80	 (goto-char tem)
81	 (insert new)))))
82
83(defun smart-complete2 (prompt str)
84  (let ((pt (point)) found
85	(pat (concat (regexp-for-this-prompt prompt)
86		     "\\(" (regexp-quote str) "\\)" ))
87	offered (not-yet t)
88	)
89    (setq bill pat)
90    (while (and  not-yet
91		 (re-search-backward pat nil t))
92      (goto-char (match-beginning 1))
93      (setq at (match-beginning 1))
94      (goto-char at)
95      (setq this (buffer-substring at
96		  (save-excursion (end-of-line) (point))))
97       (or  (member this offered)
98	    (equal this str)
99	    (progn (setq offered (cons this offered))
100		   ;; do this so the display does not shift...
101		   (goto-char pt)
102		   (setq not-yet
103			 (not (y-or-n-p (concat "Use: " this " "))))))
104       (cond (not-yet (goto-char at) (beginning-of-line) (forward-char -1))
105	     (t (setq found
106		      (save-excursion
107			(buffer-substring
108			 at
109			 (progn (goto-char at)
110				(max (save-excursion
111				       (end-of-line) (point))
112				     (save-excursion
113				       (forward-sexp 1)(point)))
114				)))))))
115    (or found (message "No more matches"))
116    found
117    ))
118
119
120;; return a regexp for this prompt but with numbers replaced.
121
122;; (defun split-string (s bag)
123;;   (cond ((equal (length s) 0) '(""))
124;; 	((string-match bag s)
125;; 	 (if (= (match-beginning  0) 0)
126;; 	    (cons "" (split-string (substring s (match-end 0)) bag))
127;; 	   (cons (substring s 0 (match-beginning 0))
128;; 		 (split-string (substring s (match-end 0)) bag))))
129;; 	(t (cons s nil))))
130
131;; Return a regexp which matches the current prompt, and which
132;; allows things like
133;; "/foo/bar# " to match  "any# "
134;; "(C12) " to match  "(C1002) " but not (gdb) nor "(D12) "
135;; if the prompt appears to be a pathname (ie has /) then
136;; allow any beginning, otherwise numbers match numbers...
137(defun regexp-for-this-prompt (prompt )
138  (let ((wild (cond ((string-match "/" prompt) "[^ >#%()]+")
139		    (t "[0-9]+"))))
140  (let ((tem (split-string prompt wild)) (ans ""))
141    (while tem
142      (setq ans (concat ans (regexp-quote (car tem))))
143      (cond ((cdr tem) (setq ans (concat ans wild))))
144      (setq tem (cdr tem)))
145    ans)))
146
147
148(provide 'smart-complete)
149
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155