Other Document Features

If your formatting language supports it, you can modify input order:

  ! Begin_Doc main.tex
  ! % Note that the order of files a.tex  
  ! % and b.tex has been switched.
  ! \input{b}
  ! \input{a}
  ! End_Doc
  !
  ! Begin_Doc a.tex
  ! This line is in file a.tex.
  ! End_Doc
  !
  ! Begin_Doc b.tex
  ! This line is in file b.tex.
  ! End_Doc
  !
  ! Begin_Doc a.tex
  ! This line is appended to file a.tex.
  ! End_Doc

Document also has a self-document (or self-test) option:

  ! Begin_Self_Documentation (or Begin_Self_Test)
  !  % mv file1 file2
  !  % f90 file.f90
  !  % Document file.f90
  ! End_Self_Documentation (or End_Self_Test)

which executes commands included in the file itself.