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Added locate for vi fans

    1: \ locate, using the TAGS file
    2: 
    3: require string.fs
    4: 
    5: Variable last-file
    6: Variable line-buf
    7: 
    8: \ example: invoke vi
    9: 
   10: Defer do-location
   11: 
   12: Variable sys-buf
   13: : invoke-vi ( filename u line -- ) base @ >r decimal
   14:     s" vi " sys-buf $!
   15:     0 <# bl hold #S '+ hold #> sys-buf $+!
   16:     sys-buf $+!
   17:     r> base ! sys-buf $@ system ;
   18: ' invoke-vi IS do-location
   19: 
   20: \ scan file
   21: 
   22: : tag-line ( fid -- flag ) >r
   23:     s" " line-buf $!
   24:     $100 line-buf $!len
   25:     line-buf $@ r> read-line throw
   26:     swap line-buf $!len ;
   27: : check-word ( addr u -- addr u flag )
   28:     line-buf $@ #del $split 2nip ctrl A $split 2drop
   29:     2swap search nip nip ;
   30: : get-file ( fid -- )
   31:     tag-line drop line-buf $@ ', $split 2drop last-file $! ;
   32: : print-location ( -- ) base @ >r decimal
   33:     last-file $@ line-buf $@ ctrl A $split 2nip ', $split 2drop
   34:     0. 2swap >number 2drop drop r> base !
   35:     do-location ;
   36: : locate ( "name" -- )  s" " last-file $!  bl sword
   37:     s" TAGS" r/o open-file throw >r
   38:     BEGIN  r@ tag-line  WHILE
   39:         s" " line-buf $@ compare 0=
   40:         IF    r@ get-file
   41:         ELSE  2dup check-word
   42:             IF  print-location 2drop  r> close-file throw  EXIT  THEN
   43:         THEN
   44:     REPEAT r> close-file throw 2drop true abort" tag not found" ;