sts.lua

module = {}

vis:option_register("strip-trailing-spaces", "bool", function(value, toogle)
    if not vis.win then
        return false
    end
    vis.win.strip_trailing_spaces = toogle and not vis.win.strip_trailing_spaces or value
    return true
end, "Strip line trailing spaces on save")

vis:command_register("sts", function(argv, force, win, selection, range)
    if win.strip_trailing_spaces then
        local lines = win.file.lines
        for index = 1, #lines do
            lines[index] = lines[index]:gsub("%s+$", "")
        end
        vis:info("Line trailing spaces trimmed." .. type(win.file.lines))
    end
    return true;
end, "Strip line trailing spaces"
)

vis.events.subscribe(vis.events.FILE_SAVE_PRE, function(file, path)
    vis:command("sts")
    return nil
end, 1)

return module