[Solved] fprettify makes nvim buffer empty

[EhsanAramide]

I use neoformat with these settings:

vim.g.neoformat_fortran_fprettify = {
    exe = "fprettify",
    args = {"--silent", "-i 4"},
}
vim.g.neoformat_enabled_fortran = {"fprettify"}

but when I run :Neoformat or other derivatives like :Neoformat! fortran or :Neofortran fprettify the buffer is made empty.

• example 1:

  ! current buffer
  program    hello
  print *, "Hello World"
  end     program

  then :Neoformat command makes the buffer empty but when I run !fprettify --silent -i 4 <file-name> everything will be fine!

• example 2:

  ! current buffer
  program    hello
  print *, "Hello World"
  end     program

  I run !fprettify --silent -i 4 <file-name>

  ! buffer after running the command
  program hello
  print *, "Hello World"
  end program

[EhsanAramide]

[Answer] I found the problem. Based on autoload settings, option 'stdin': 1 has been set by default. when we pass our settings or definitions to neoformat, based on these lines, it will replace the default definition with our definition that we had set, so we can add 'stdin': 1 to our definition.

• My definition turns into:

  vim.g.neoformat_fortran_fprettify = {
  exe = "fprettify",
  args = {"--silent", "-i 4"},
  stdin = 1
  }
  vim.g.neoformat_enabled_fortran = {"fprettify"}