79 lines
2.0 KiB
Lua
79 lines
2.0 KiB
Lua
-- primitives for saving to file and loading from file
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function file_exists(filename)
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local infile = App.open_for_reading(filename)
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if infile then
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infile:close()
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return true
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else
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return false
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end
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end
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function load_from_disk(State)
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local infile = App.open_for_reading(State.filename)
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State.lines = load_from_file(infile)
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if infile then infile:close() end
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end
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function load_from_file(infile)
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local result = {}
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if infile then
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local infile_next_line = infile:lines() -- works with both Lua files and LÖVE Files (https://www.love2d.org/wiki/File)
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while true do
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local line = infile_next_line()
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if line == nil then break end
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table.insert(result, {data=line})
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end
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end
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if #result == 0 then
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table.insert(result, {data=''})
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end
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return result
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end
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function save_to_disk(State)
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local outfile = App.open_for_writing(State.filename)
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if not outfile then
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error('failed to write to "'..State.filename..'"')
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end
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for _,line in ipairs(State.lines) do
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outfile:write(line.data)
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outfile:write('\n')
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end
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outfile:close()
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end
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-- for tests
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function load_array(a)
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local result = {}
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local next_line = ipairs(a)
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local i,line,drawing = 0, ''
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while true do
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i,line = next_line(a, i)
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if i == nil then break end
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table.insert(result, {data=line})
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end
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if #result == 0 then
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table.insert(result, {data=''})
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end
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return result
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end
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function is_absolute_path(path)
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local os_path_separator = package.config:sub(1,1)
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if os_path_separator == '/' then
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-- POSIX systems permit backslashes in filenames
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return path:sub(1,1) == '/'
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elseif os_path_separator == '\\' then
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if path:sub(2,2) == ':' then return true end -- DOS drive letter followed by volume separator
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local f = path:sub(1,1)
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return f == '/' or f == '\\'
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else
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error('What OS is this? LÖVE reports that the path separator is "'..os_path_separator..'"')
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end
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end
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function is_relative_path(path)
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return not is_absolute_path(path)
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end
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