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module file_handling
integer, parameter::file_type_plain_text = 1
integer, parameter::file_type_gemini = 2
contains
function read_line_text(unit_number, iostatus) result(res)
implicit none
character(len=:), allocatable::res
integer, intent(in)::unit_number
integer, intent(out)::iostatus
integer::startpos, endpos, length, i
character::c
inquire(unit=unit_number, pos=startpos)
endpos = startpos
read(unit_number, '(A1)', advance='no', iostat=iostatus) c
do while(c /= CHAR(10) .AND. iostatus == 0)
endpos = endpos + 1
read(unit_number, '(A1)', advance='no', iostat=iostatus) c
end do
length = (endpos - startpos + 1)
print '(A10, I8)', "allocated", length
allocate(character(len=length) :: res)
res = repeat(' ', length)
read(unit_number, '(A1)', pos=startpos, advance='no', iostat=iostatus) c
if(iostatus == 0) then
res(1:1) = c
do i=2, length
read(unit_number, '(A1)', advance='no', iostat=iostatus) c
if(iostatus /= 0) then
exit
end if
res(i:i) = c
end do
end if
end function read_line_text
subroutine process_line(single_line, file_type, preformatted_on)
use layout
implicit none
type(line), intent(inout)::single_line
integer, intent(in)::file_type
logical, intent(inout)::preformatted_on
integer::line_length
if(file_type == file_type_plain_text) then
single_line%line_type = line_type_preformatted
preformatted_on = .TRUE.
else if(file_type == file_type_gemini) then
line_length = len_trim(single_line%text)
if(line_length > 2 .AND. single_line%text(1:2) == "=>") then
single_line%line_type = line_type_link
single_line%text(1:2) = " "
single_line%text = adjustl(single_line%text)
else if(line_length >= 3 .AND. single_line%text(1:3) == "```") then
preformatted_on = .not. preformatted_on
single_line%line_type = line_type_indicator
else if(preformatted_on) then
single_line%line_type = line_type_preformatted
else
single_line%line_type = line_type_text
end if
end if
end subroutine process_line
function load_unit(unit_number, file_type) result(first_line)
use layout
implicit none
integer, intent(in)::unit_number, file_type
type(line), pointer::first_line
type(line), pointer::walker, next_line
character::c
integer::iostatus
logical::preformatted_on
preformatted_on = .FALSE.
allocate(first_line)
first_line%text = read_line_text(unit_number, iostatus)
first_line%next => null()
walker=>first_line
call process_line(walker, file_type, preformatted_on)
do while(iostatus /= -1) ! -1 should be end of file
allocate(next_line)
next_line%next => null()
walker%next => next_line
next_line => null()
walker => walker%next
walker%text = read_line_text(unit_number, iostatus)
print *, walker%text
call process_line(walker, file_type, preformatted_on)
end do
end function load_unit
function load_filename(filename, iostatus, mimetype) result(first_line)
use layout, only: line
implicit none
character(*), intent(in)::filename
integer, intent(out)::iostatus
character(*), intent(in), optional::mimetype
type(line), pointer::first_line
integer::filetype
open(unit=1097, file=filename, access='stream', iostat=iostatus, form='FORMATTED')
if(iostatus == 0) then
if(present(mimetype)) then
if(trim(mimetype) == 'text/gemini') then
filetype = file_type_gemini
else
filetype = file_type_plain_text
end if
else
filetype = file_type_plain_text
end if
first_line => load_unit(1097, filetype)
end if
end function load_filename
end module file_handling
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