1: \ Etags support for GNU Forth.
2:
3: \ Copyright (C) 1995 Free Software Foundation, Inc.
4:
5: \ This file is part of Gforth.
6:
7: \ Gforth is free software; you can redistribute it and/or
8: \ modify it under the terms of the GNU General Public License
9: \ as published by the Free Software Foundation; either version 2
10: \ of the License, or (at your option) any later version.
11:
12: \ This program is distributed in the hope that it will be useful,
13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: \ GNU General Public License for more details.
16:
17: \ You should have received a copy of the GNU General Public License
18: \ along with this program; if not, write to the Free Software
19: \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20:
21:
22: \ This does not work like etags; instead, the TAGS file is updated
23: \ during the normal Forth interpretation/compilation process.
24:
25: \ The present version has several shortcomings: It always overwrites
26: \ the TAGS file instead of just the parts corresponding to the loaded
27: \ files, but you can have several tag tables in emacs. Every load
28: \ creates a new etags file and the user has to confirm that she wants
29: \ to use it.
30:
31: \ Communication of interactive programs like emacs and Forth over
32: \ files is clumsy. There should be better cooperation between them
33: \ (e.g. via shared memory)
34:
35: \ This is ANS Forth with the following serious environmental
36: \ dependences: the variable LAST must contain a pointer to the last
37: \ header, NAME>STRING must convert that pointer to a string, and
38: \ HEADER must be a deferred word that is called to create the name.
39:
40: include extend.fs
41:
42: : tags-file-name ( -- c-addr u )
43: \ for now I use just TAGS; this may become more flexible in the
44: \ future
45: s" TAGS" ;
46:
47: variable tags-file 0 tags-file !
48:
49: create tags-line 128 chars allot
50:
51: : skip-tags ( file-id -- )
52: \ reads in file until it finds the end or the loadfilename
53: drop ;
54:
55: : tags-file-id ( -- file-id )
56: tags-file @ 0= if
57: tags-file-name w/o create-file throw
58: \ 2dup file-status
59: \ if \ the file does not exist
60: \ drop w/o create-file throw
61: \ else
62: \ drop r/w open-file throw
63: \ dup skip-tags
64: \ endif
65: tags-file !
66: endif
67: tags-file @ ;
68:
69: 2variable last-loadfilename 0 0 last-loadfilename 2!
70:
71: : put-load-file-name ( file-id -- )
72: >r
73: sourcefilename last-loadfilename 2@ d<>
74: if
75: #ff r@ emit-file throw
76: #lf r@ emit-file throw
77: sourcefilename 2dup
78: r@ write-file throw
79: last-loadfilename 2!
80: s" ,0" r@ write-line throw
81: endif
82: rdrop ;
83:
84: : put-tags-entry ( -- )
85: \ write the entry for the last name to the TAGS file
86: \ if the input is from a file and it is not a local name
87: source-id dup 0<> swap -1 <> and \ input from a file
88: current @ locals-list <> and \ not a local name
89: last @ 0<> and \ not an anonymous (i.e. noname) header
90: if
91: tags-file-id >r
92: r@ put-load-file-name
93: source drop >in @ r@ write-file throw
94: 127 r@ emit-file throw
95: bl r@ emit-file throw
96: last @ name>string r@ write-file throw
97: bl r@ emit-file throw
98: 1 r@ emit-file throw
99: base @ decimal sourceline# 0 <# #s #> r@ write-file throw base !
100: s" ,0" r@ write-line throw
101: \ the character position in the file; not strictly necessary AFAIK
102: \ instead of using 0, we could use file-position and subtract
103: \ the line length
104: rdrop
105: endif ;
106:
107: : (tags-header) ( -- )
108: defers header
109: put-tags-entry ;
110:
111: ' (tags-header) IS header
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