log.f90

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! Copyright (c) 2021-2024, The Neko Authors
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module logger
  use comm, only : pe_rank
  use num_types, only : rp
  use, intrinsic :: iso_fortran_env, only: stdout => output_unit, &
       stderr => error_unit
  implicit none
  private
 
  integer, public, parameter :: log_size = 80
 
  type, public :: log_t
     integer :: indent_
     integer :: section_id_
     integer :: level_
     integer :: unit_
   contains
     procedure, pass(this) :: init => log_init
     procedure, pass(this) :: begin => log_begin
     procedure, pass(this) :: end => log_end
     procedure, pass(this) :: indent => log_indent
     procedure, pass(this) :: newline => log_newline
     procedure, pass(this) :: message => log_message
     procedure, pass(this) :: section => log_section
     procedure, pass(this) :: status => log_status
     procedure, pass(this) :: header => log_header
     procedure, pass(this) :: error => log_error
     procedure, pass(this) :: warning => log_warning
     procedure, pass(this) :: end_section => log_end_section
  end type log_t
 
  type(log_t), public :: neko_log
  integer, public, parameter :: neko_log_quiet = 0
  integer, public, parameter :: neko_log_info = 1
  integer, public, parameter :: neko_log_verbose = 2
  integer, public, parameter :: neko_log_debug = 10
 
contains
 
  subroutine log_init(this)
    class(log_t), intent(inout) :: this
    character(len=255) :: log_level
    character(len=255) :: log_file
    integer :: envvar_len
 
    this%indent_ = 1
    this%section_id_ = 0
 
    call get_environment_variable("NEKO_LOG_LEVEL", log_level, envvar_len)
    if (envvar_len .gt. 0) then
       read(log_level(1:envvar_len), *) this%level_
    else
       this%level_ = neko_log_info
    end if
 
    call get_environment_variable("NEKO_LOG_FILE", log_file, envvar_len)
    if (envvar_len .gt. 0) then
       this%unit_ = 69
       open(unit = this%unit_, file = trim(log_file), status = 'replace', &
            action = 'write')
    else
       this%unit_ = stdout
    end if
 
  end subroutine log_init
 
  subroutine log_begin(this)
    class(log_t), intent(inout) :: this
 
    if (pe_rank .eq. 0) then
       this%indent_ = this%indent_ + 1
    end if
 
  end subroutine log_begin
 
  subroutine log_end(this)
    class(log_t), intent(inout) :: this
 
    if (pe_rank .eq. 0) then
       this%indent_ = this%indent_ - 1
    end if
 
  end subroutine log_end
 
  subroutine log_indent(this)
    class(log_t), intent(in) :: this
    integer :: i
 
    if (pe_rank .eq. 0) then
       write(this%unit_, '(A)', advance = 'no') repeat(' ', this%indent_)
    end if
 
  end subroutine log_indent
 
  subroutine log_newline(this, lvl)
    class(log_t), intent(in) :: this
    integer, optional :: lvl
 
    integer :: lvl_
 
    if (present(lvl)) then
       lvl_ = lvl
    else
       lvl_ = neko_log_info
    end if
 
    if (lvl_ .gt. this%level_) then
       return
    end if
 
    if (pe_rank .eq. 0) then
       write(this%unit_, '(A)') ''
    end if
 
  end subroutine log_newline
 
  subroutine log_message(this, msg, lvl)
    class(log_t), intent(in) :: this
    character(len=*), intent(in) :: msg
    integer, optional :: lvl
    integer :: lvl_
 
    if (present(lvl)) then
       lvl_ = lvl
    else
       lvl_ = neko_log_info
    end if
 
    if (lvl_ .gt. this%level_) then
       return
    end if
 
    if (pe_rank .eq. 0) then
       call this%indent()
       write(this%unit_, '(A)') trim(msg)
    end if
 
  end subroutine log_message
 
  subroutine log_header(this, version, build_info)
    class(log_t), intent(in) :: this
    character(len=*), intent(in) :: version
    character(len=*), intent(in) :: build_info
 
    if (pe_rank .eq. 0) then
       write(this%unit_, '(A)') ''
       write(this%unit_, '(1X,A)') '   _  __  ____  __ __  ____  '
       write(this%unit_, '(1X,A)') '  / |/ / / __/ / //_/ / __ \ '
       write(this%unit_, '(1X,A)') ' /    / / _/  / ,<   / /_/ / '
       write(this%unit_, '(1X,A)') '/_/|_/ /___/ /_/|_|  \____/  '
       write(this%unit_, '(A)') ''
       write(this%unit_, '(1X,A,A,A)') '(version: ', trim(version), ')'
       write(this%unit_, '(1X,A)') trim(build_info)
       write(this%unit_, '(A)') ''
    end if
 
  end subroutine log_header
 
  subroutine log_error(this, msg)
    class(log_t), intent(in) :: this
    character(len=*), intent(in) :: msg
 
    if (pe_rank .eq. 0) then
       call this%indent()
       write(stderr, '(A,A,A)') '*** ERROR: ', trim(msg), '  ***'
    end if
 
  end subroutine log_error
 
  subroutine log_warning(this, msg)
    class(log_t), intent(in) :: this
    character(len=*), intent(in) :: msg
 
    if (pe_rank .eq. 0) then
       call this%indent()
       write(this%unit_, '(A,A,A)') '*** WARNING: ', trim(msg), '  ***'
    end if
 
  end subroutine log_warning
 
  subroutine log_section(this, msg, lvl)
    class(log_t), intent(inout) :: this
    character(len=*), intent(in) :: msg
    integer, optional :: lvl
 
    integer :: i, pre, pos
    integer :: lvl_
 
    if (present(lvl)) then
       lvl_ = lvl
    else
       lvl_ = neko_log_info
    end if
 
    if (lvl_ .gt. this%level_) then
       return
    end if
 
    if (pe_rank .eq. 0) then
 
       this%indent_ = this%indent_ + this%section_id_
       this%section_id_ = this%section_id_ + 1
 
       pre = (30 - len_trim(msg)) / 2
       pos = 30 - (len_trim(msg) + pre)
 
       write(this%unit_, '(A)') ''
       call this%indent()
       write(this%unit_, '(A,A,A)') &
            repeat('-', pre), trim(msg), repeat('-', pos)
 
    end if
 
  end subroutine log_section
 
  subroutine log_end_section(this, msg, lvl)
    class(log_t), intent(inout) :: this
    character(len=*), intent(in), optional :: msg
    integer, optional :: lvl
    integer :: lvl_
 
    if (present(lvl)) then
       lvl_ = lvl
    else
       lvl_ = neko_log_info
    end if
 
    if (lvl_ .gt. this%level_) then
       return
    end if
 
    if (present(msg)) then
       call this%message(msg, neko_log_quiet)
    end if
 
    if (pe_rank .eq. 0) then
       this%section_id_ = this%section_id_ - 1
       this%indent_ = this%indent_ - this%section_id_
    end if
 
  end subroutine log_end_section
 
  subroutine log_status(this, t, T_end)
    class(log_t), intent(in) :: this
    real(kind=rp), intent(in) :: t
    real(kind=rp), intent(in) :: t_end
    character(len=LOG_SIZE) :: log_buf
    real(kind=rp) :: t_prog
 
    t_prog = 100d0 * t / t_end
    write(log_buf, '(A4,E15.7,34X,A2,F6.2,A3)') 't = ', t, '[ ', t_prog, '% ]'
 
    call this%message(repeat('-', 64), neko_log_quiet)
    call this%message(log_buf, neko_log_quiet)
    call this%message(repeat('-', 64), neko_log_quiet)
 
  end subroutine log_status
 
  !
  ! Rudimentary C interface
  !
 
  subroutine log_message_c(c_msg) bind(c, name = 'log_message')
    use, intrinsic :: iso_c_binding
    character(kind=c_char), dimension(*), intent(in) :: c_msg
    character(len=LOG_SIZE) :: msg
    integer :: len
 
    if (pe_rank .eq. 0) then
       len = 0
       do
          if (c_msg(len+1) .eq. c_null_char) exit
          len = len + 1
          msg(len:len) = c_msg(len)
       end do
 
       call neko_log%indent()
       write(neko_log%unit_, '(A)') trim(msg(1:len))
    end if
 
  end subroutine log_message_c
 
  subroutine log_error_c(c_msg) bind(c, name = "log_error")
    use, intrinsic :: iso_c_binding
    character(kind=c_char), dimension(*), intent(in) :: c_msg
    character(len=LOG_SIZE) :: msg
    integer :: len
 
    if (pe_rank .eq. 0) then
       len = 0
       do
          if (c_msg(len+1) .eq. c_null_char) exit
          len = len + 1
          msg(len:len) = c_msg(len)
       end do
 
       call neko_log%indent()
       write(stderr, '(A,A,A)') '*** ERROR: ', trim(msg(1:len)), '  ***'
    end if
 
  end subroutine log_error_c
 
  subroutine log_warning_c(c_msg) bind(c, name = "log_warning")
    use, intrinsic :: iso_c_binding
    character(kind=c_char), dimension(*), intent(in) :: c_msg
    character(len=LOG_SIZE) :: msg
    integer :: len
 
    if (pe_rank .eq. 0) then
       len = 0
       do
          if (c_msg(len+1) .eq. c_null_char) exit
          len = len + 1
          msg(len:len) = c_msg(len)
       end do
 
       call neko_log%indent()
       write(neko_log%unit_, '(A,A,A)') &
            '*** WARNING: ', trim(msg(1:len)), '  ***'
    end if
 
  end subroutine log_warning_c
 
  subroutine log_section_c(c_msg) bind(c, name = "log_section")
    use, intrinsic :: iso_c_binding
    character(kind=c_char), dimension(*), intent(in) :: c_msg
    character(len=LOG_SIZE) :: msg
    integer :: len
 
    if (pe_rank .eq. 0) then
       len = 0
       do
          if (c_msg(len+1) .eq. c_null_char) exit
          len = len + 1
          msg(len:len) = c_msg(len)
       end do
 
       call neko_log%section(trim(msg(1:len)))
    end if
 
  end subroutine log_section_c
 
  subroutine log_end_section_c() bind(c, name = "log_end_section")
 
    call neko_log%end_section()
 
  end subroutine log_end_section_c
 
end module logger