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Annotation of gforth/locate.fs, revision 1.1

1.1     ! pazsan      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" ;