Here we give some hints on how to extend potfit. In particular, we list some common pitfalls that are to be avoided.
potfit source code is indented according to the default emacs indentation. The same effect can be achieved with the [[http://www.gnu.org/software/indent/|GNU indent command]], version >=2.2.10, using the following command:
indent -gnu -cdw -cli4 -npsl -npcs -di6 -ncs -ce -br -brs -nlp -hnl -l110 -bbo -T real -T apot_table_t -T pot_table_t -T vector -T sym_tens -T neigh_t -T atom_t -T FILE -T Param_T -T Interaction_T *.[[ch]]
Sections that are NOT to be indented in this way have to be marked with
/* *INDENT-OFF* */
at their beginning and
/* *INDENT-ON* */
at their end, each control comment on a line of its own.
Before a new parameter can be used, it must be