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auto-formatter for modern fortran source code

Project description

License: GPL v3

fprettify is an auto-formatter for modern Fortran code that imposes strict whitespace formatting.


  • Auto-indentation.

  • Line continuations are aligned with the previous opening delimiter (, [ or (/ or with an assignment operator = or =>. If none of the above is present, a default hanging indent is applied.

  • Consistent amount of whitespace around operators and delimiters.

  • Removal of extraneous whitespace and consecutive blank lines.

  • Works only for modern Fortran (Fortran 90 upwards).

  • Tested for editor integration.

  • By default, fprettify causes changes in the amount of whitespace only and thus preserves revision history.


program demo
integer :: endif,if,else
endif=3; if=2
else if(endif==3)then
end program

⇩⇩⇩⇩⇩⇩⇩⇩⇩⇩ fprettify ⇩⇩⇩⇩⇩⇩⇩⇩⇩⇩

program demo
   integer :: endif, if, else
   endif = 3; if = 2
   if (endif == 2) then
      endif = 5
      else = if + 4*(endif + &
   else if (endif == 3) then
      print *, endif
end program


Autoformat file1, file2, … inplace by

fprettify file1, file2, ...

The default indent is 3. If you prefer something else, use --indent n argument. For more options, read

fprettify -h

For editor integration, use

fprettify --silent

For instance, with Vim, use fprettify with gq by putting the following commands in your .vimrc:

autocmd Filetype fortran setlocal formatprg=fprettify\ --silent

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