ada-mode: Non-standard file names

 
 3.1 Non-standard file names
 ===========================
 
 By default, Ada mode is configured to use the GNAT file naming
 convention, where file names are a simple modification of the Ada names,
 and the extension for specs and bodies are ‘.ads’ and ‘.adb’,
 respectively.
 
    Ada mode uses the file extensions to allow moving from a package body
 to the corresponding spec and back.
 
    Ada mode supports a list of alternative file extensions for specs and
 bodies.
 
    For instance, if your spec and bodies files are called ‘UNIT_s.ada’
 and ‘UNIT_b.ada’, respectively, you can add the following to your
 ‘.emacs’ file:
 
      (ada-add-extensions "_s.ada" "_b.ada")
 
    You can define additional extensions:
 
      (ada-add-extensions ".ads" "_b.ada")
      (ada-add-extensions ".ads" ".body")
 
    This means that whenever Ada mode looks for the body for a file whose
 extension is ‘.ads’, it will take the first available file that ends
 with either ‘.adb’, ‘_b.ada’ or ‘.body’.
 
    Similarly, if Ada mode is looking for a spec, it will look for ‘.ads’
 or ‘_s.ada’.
 
    If the filename is not derived from the Ada name following the GNAT
 convention, things are a little more complicated.  You then need to
 rewrite the function ‘ada-make-filename-from-adaname’.  Doing that is
 beyond the scope of this manual; see the current definitions in
 ‘ada-mode.el’ and ‘ada-xref.el’ for examples.