-- the filter module must implement the load_filter function
function M.load_filters(filters, load_filter)
local sequence = {}
if type(filters) == "string" then
table.insert(sequence,load_filter(filters))
elseif type(filters) == "table" then
for _,n in ipairs(filters) do
if type(n) == "string" then
table.insert(sequence,load_filter(n))
elseif type(n) == "function" then
table.insert(sequence, n)
end
end
elseif type(filters) == "function" then
table.insert(sequence, filters)
else
return false, "Argument to filter must be either\ntable with filter names, or single filter name"
end
return sequence
end
function M.load_input_file(filename)
if not filename then return false, "filters: no filename" end
local input = nil
if filename then
local file = io.open(filename,"r")
input = file:read("*all")
file:close()
end
return input
end
function M.save_input_file(filename, input)
local file = io.open(filename,"w")
file:write(input)
file:close()
end
