\ Etags support for GNU Forth. \ This does not work like etags; instead, the TAGS file is updated \ during the normal Forth interpretation/compilation process. \ The present version has several shortcomings: It always overwrites \ the TAGS file instead of just the parts corresponding to the loaded \ files, but you can have several tag tables in emacs. Every load \ creates a new etags file and the user has to confirm that she wants \ to use it. \ Communication of interactive programs like emacs and Forth over \ files is clumsy. There should be better cooperation between them \ (e.g. via shared memory) \ This is ANS Forth with the following serious environmental \ dependences: the variable LAST must contain a pointer to the last \ header, NAME>STRING must convert that pointer to a string, and \ HEADER must be a deferred word that is called to create the name. : tags-file-name ( -- c-addr u ) \ for now I use just TAGS; this may become more flexible in the \ future s" TAGS" ; variable tags-file 0 tags-file ! create tags-line 128 chars allot : skip-tags ( file-id -- ) \ reads in file until it finds the end or the loadfilename drop ; : tags-file-id ( -- file-id ) tags-file @ 0= if tags-file-name w/o create-file throw \ 2dup file-status \ if \ the file does not exist \ drop w/o create-file throw \ else \ drop r/w open-file throw \ dup skip-tags \ endif tags-file ! endif tags-file @ ; create emit-file-char 0 c, : emit-file ( c file-id -- ) swap emit-file-char c! emit-file-char 1 chars rot write-file ; 2variable last-loadfilename 0 0 last-loadfilename 2! : put-load-file-name ( file-id -- ) >r loadfilename 2@ last-loadfilename 2@ d<> if #ff r@ emit-file throw #lf r@ emit-file throw loadfilename 2@ 2dup r@ write-file throw last-loadfilename 2! s" ,0" r@ write-line throw endif rdrop ; : put-tags-entry ( -- ) \ write the entry for the last name to the TAGS file \ if the input is from a file and it is not a local name source-id dup 0<> swap -1 <> and \ input from a file get-current locals-list <> and \ not a local name last @ 0<> and \ not an anonymous (i.e. noname) header if tags-file-id >r r@ put-load-file-name source drop >in @ r@ write-file throw 127 r@ emit-file throw last @ name>string r@ write-file throw 1 r@ emit-file throw base @ decimal loadline @ 0 <# #s #> r@ write-file throw base ! s" ,0" r@ write-line throw \ the character position in the file; not strictly necessary AFAIK \ instead of using 0, we could use file-position and subtract \ the line length rdrop endif ; : (tags-header) ( -- ) defers header put-tags-entry ; ' (tags-header) IS header