Annotation of gforth/etags.fs, revision 1.8

1.1       anton       1: \ Etags support for GNU Forth.
                      2: 
1.3       anton       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: 
1.1       anton      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: 
1.8     ! pazsan     40: require search.fs
        !            41: require extend.fs
1.7       pazsan     42: 
1.1       anton      43: : tags-file-name ( -- c-addr u )
                     44:     \ for now I use just TAGS; this may become more flexible in the
                     45:     \ future
                     46:     s" TAGS" ;
                     47: 
                     48: variable tags-file 0 tags-file !
                     49: 
                     50: create tags-line 128 chars allot
                     51:     
                     52: : skip-tags ( file-id -- )
                     53:     \ reads in file until it finds the end or the loadfilename
                     54:     drop ;
                     55: 
                     56: : tags-file-id ( -- file-id )
                     57:     tags-file @ 0= if
                     58:        tags-file-name w/o create-file throw
                     59: \      2dup file-status
                     60: \      if \ the file does not exist
                     61: \          drop w/o create-file throw
                     62: \      else
                     63: \          drop r/w open-file throw
                     64: \          dup skip-tags
                     65: \      endif
                     66:        tags-file !
                     67:     endif
                     68:     tags-file @ ;
                     69: 
                     70: 2variable last-loadfilename 0 0 last-loadfilename 2!
                     71: 
                     72: : put-load-file-name ( file-id -- )
                     73:     >r
1.4       anton      74:     sourcefilename last-loadfilename 2@ d<>
1.1       anton      75:     if
                     76:        #ff r@ emit-file throw
                     77:        #lf r@ emit-file throw
1.4       anton      78:        sourcefilename 2dup
1.1       anton      79:        r@ write-file throw
                     80:        last-loadfilename 2!
                     81:        s" ,0" r@ write-line throw
                     82:     endif
                     83:     rdrop ;
                     84: 
                     85: : put-tags-entry ( -- )
                     86:     \ write the entry for the last name to the TAGS file
                     87:     \ if the input is from a file and it is not a local name
                     88:     source-id dup 0<> swap -1 <> and   \ input from a file
1.5       anton      89:     current @ locals-list <> and       \ not a local name
1.1       anton      90:     last @ 0<> and     \ not an anonymous (i.e. noname) header
                     91:     if
                     92:        tags-file-id >r 
                     93:        r@ put-load-file-name
                     94:        source drop >in @ r@ write-file throw
                     95:        127 r@ emit-file throw
1.2       pazsan     96:        bl r@ emit-file throw
1.1       anton      97:        last @ name>string r@ write-file throw
1.2       pazsan     98:        bl r@ emit-file throw
1.1       anton      99:        1 r@ emit-file throw
1.4       anton     100:        base @ decimal sourceline# 0 <# #s #> r@ write-file throw base !
1.1       anton     101:        s" ,0" r@ write-line throw
                    102:        \ the character position in the file; not strictly necessary AFAIK
                    103:        \ instead of using 0, we could use file-position and subtract
                    104:        \ the line length
                    105:        rdrop
1.5       anton     106:     endif ;
1.1       anton     107: 
                    108: : (tags-header) ( -- )
                    109:     defers header
                    110:     put-tags-entry ;
                    111: 
                    112: ' (tags-header) IS header

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