Configuration

vhdl-mode already provides a similar functionality through the customizable variable vhdl-modify-date-on-saving. Since both features cannot work at the same time it is needed to disable one of them. E.g:

(setq vhdl-modify-date-on-saving nil)

Time-stamp

Emacs has a built-in package called time-stamp that automatically updates the modification date of a file upon save.

Setup of the comment headers is required so that they are recognized properly.

Check the values of the following customizable variables:

• vhdl-ext-time-stamp-enable
  • Defaults to t
• vhdl-ext-time-stamp-regex
  • Defaults to "^-- Last update: " as generated by vhdl-template-header
• vhdl-ext-time-stamp-pattern
  • If using a value different than the default for vhdl-ext-time-stamp-regex this one needs to be updated accordingly, e.g:

    (setq vhdl-ext-time-stamp-pattern (concat vhdl-ext-time-stamp-regex "%%$"))
    

By default time-stamp looks for the pattern in the first 8 lines. This can be changed by setting the local variables vhdl-ext-time-stamp-start and vhdl-ext-time-stamp-end for custom scenarios.