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-- primitives for saving to file and loading from file
Fold = '\x1e' -- ASCII RS (record separator)
function file_exists(filename)
local infile = App.open_for_reading(filename)
if infile then
infile:close()
return true
else
return false
end
end
function load_from_disk(State)
local infile = App.open_for_reading(State.filename)
State.lines = load_from_file(infile)
if infile then infile:close() end
end
function load_from_file(infile)
local result = {}
if infile then
local infile_next_line = infile:lines() -- works with both Lua files and LÖVE Files (https://www.love2d.org/wiki/File)
while true do
local line = infile_next_line()
if line == nil then break end
local line_info = {}
if line:find(Fold) then
_, _, line_info.data, line_info.dataB = line:find('([^'..Fold..']*)'..Fold..'([^'..Fold..']*)')
else
line_info.data = line
end
table.insert(result, line_info)
end
end
if #result == 0 then
table.insert(result, {data=''})
end
return result
end
function save_to_disk(State)
local outfile = App.open_for_writing(State.filename)
if outfile == nil then
error('failed to write to "'..State.filename..'"')
end
for _,line in ipairs(State.lines) do
outfile:write(line.data)
if line.dataB and #line.dataB > 0 then
outfile:write(Fold)
outfile:write(line.dataB)
end
outfile:write('\n')
end
outfile:close()
end
-- for tests
function load_array(a)
local result = {}
local next_line = ipairs(a)
local i,line,drawing = 0, ''
while true do
i,line = next_line(a, i)
if i == nil then break end
local line_info = {}
if line:find(Fold) then
_, _, line_info.data, line_info.dataB = line:find('([^'..Fold..']*)'..Fold..'([^'..Fold..']*)')
else
line_info.data = line
end
table.insert(result, line_info)
end
if #result == 0 then
table.insert(result, {data=''})
end
return result
end
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