Annotation of gforth/etags.fs, revision 1.2
1.1 anton 1: \ Etags support for GNU Forth.
2:
3: \ This does not work like etags; instead, the TAGS file is updated
4: \ during the normal Forth interpretation/compilation process.
5:
6: \ The present version has several shortcomings: It always overwrites
7: \ the TAGS file instead of just the parts corresponding to the loaded
8: \ files, but you can have several tag tables in emacs. Every load
9: \ creates a new etags file and the user has to confirm that she wants
10: \ to use it.
11:
12: \ Communication of interactive programs like emacs and Forth over
13: \ files is clumsy. There should be better cooperation between them
14: \ (e.g. via shared memory)
15:
16: \ This is ANS Forth with the following serious environmental
17: \ dependences: the variable LAST must contain a pointer to the last
18: \ header, NAME>STRING must convert that pointer to a string, and
19: \ HEADER must be a deferred word that is called to create the name.
20:
21: : tags-file-name ( -- c-addr u )
22: \ for now I use just TAGS; this may become more flexible in the
23: \ future
24: s" TAGS" ;
25:
26: variable tags-file 0 tags-file !
27:
28: create tags-line 128 chars allot
29:
30: : skip-tags ( file-id -- )
31: \ reads in file until it finds the end or the loadfilename
32: drop ;
33:
34: : tags-file-id ( -- file-id )
35: tags-file @ 0= if
36: tags-file-name w/o create-file throw
37: \ 2dup file-status
38: \ if \ the file does not exist
39: \ drop w/o create-file throw
40: \ else
41: \ drop r/w open-file throw
42: \ dup skip-tags
43: \ endif
44: tags-file !
45: endif
46: tags-file @ ;
47:
48: create emit-file-char 0 c,
49:
50: : emit-file ( c file-id -- )
51: swap emit-file-char c!
52: emit-file-char 1 chars rot write-file ;
53:
54: 2variable last-loadfilename 0 0 last-loadfilename 2!
55:
56: : put-load-file-name ( file-id -- )
57: >r
58: loadfilename 2@ last-loadfilename 2@ d<>
59: if
60: #ff r@ emit-file throw
61: #lf r@ emit-file throw
62: loadfilename 2@ 2dup
63: r@ write-file throw
64: last-loadfilename 2!
65: s" ,0" r@ write-line throw
66: endif
67: rdrop ;
68:
69: : put-tags-entry ( -- )
70: \ write the entry for the last name to the TAGS file
71: \ if the input is from a file and it is not a local name
72: source-id dup 0<> swap -1 <> and \ input from a file
73: get-current locals-list <> and \ not a local name
74: last @ 0<> and \ not an anonymous (i.e. noname) header
75: if
76: tags-file-id >r
77: r@ put-load-file-name
78: source drop >in @ r@ write-file throw
79: 127 r@ emit-file throw
1.2 ! pazsan 80: bl r@ emit-file throw
1.1 anton 81: last @ name>string r@ write-file throw
1.2 ! pazsan 82: bl r@ emit-file throw
1.1 anton 83: 1 r@ emit-file throw
84: base @ decimal loadline @ 0 <# #s #> r@ write-file throw base !
85: s" ,0" r@ write-line throw
86: \ the character position in the file; not strictly necessary AFAIK
87: \ instead of using 0, we could use file-position and subtract
88: \ the line length
89: rdrop
1.2 ! pazsan 90: endif cr ;
1.1 anton 91:
92: : (tags-header) ( -- )
93: defers header
94: put-tags-entry ;
95:
96: ' (tags-header) IS header
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