Mòideal:Indent

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This module is subject to page protection. It is a highly visible module in use by a very large number of pages, or is substituted very frequently. Because vandalism or mistakes would affect many pages, and even trivial editing might cause substantial load on the servers, it is protected from editing.

This module is rated as alpha. It is ready for third-party input, and may be used on a few pages to see if problems arise, but should be watched. Suggestions for new features or changes in their input and output mechanisms are welcome.

This is a Lua implementation of the {{Indent}} template. Please see the template page for documentation.

local p = {}

function p.indent(frame)
    -- Trim whitespace from the arguments and remove blank values.
    local args = {}
    if type(frame.args) == 'table' then
        for k, v in pairs( frame.args ) do
            v = mw.text.trim(v)
            if v ~= '' then
                args[k] = v
            end
        end
    end
    
    -- Set variables.
    local indent = tonumber( args[1] )
    local br = args[2]
    local ret = ''
    
    -- Insert line breaks to match the functionality of the original template.
    -- If "br" is set, we need two line breaks; if not, we just need one.
    if br then
        ret = ret .. '<br />' 
    end
    ret = ret .. '<br />'
    
    -- Control for bad or zero input. If found, output the line breaks only, 
    -- as this was the previous behaviour of the template.
    if not indent or indent <= 0 or math.floor(indent) ~= indent then
        return ret
    end
    
    -- Generate the indents. The first four cases are special.
    if indent == 1 then
        return ret .. '&nbsp;'
    elseif indent == 2 then
        return ret .. '&nbsp;&nbsp;'
    elseif indent == 3 then
        return ret .. '&nbsp;&emsp;&nbsp;'
    elseif indent == 4 then
        return ret .. '&nbsp; &emsp; &nbsp;'
    end
    
    -- Set variables for generating the output after indent == 5.
    local r = {}
    r.base = '&nbsp;' -- Common text to all output.
    r.rep = ' &emsp; &nbsp;' -- The text to repeat.
    r.mod1 = '&nbsp;' -- To return on modulo 1.
    r.mod2 = ' &emsp;' -- To return on modulo 2.
    r.mod3 = ' &emsp;&nbsp;' -- To return on modulo 3.
    
    -- New iteratorText values needed at 5, 9, 13, 17, etc., so repeat the
    -- text (indent - 1)/4 times and find the remainder.
    local reps = math.floor( (indent - 1) / 4 )
    local remainder = math.fmod( indent - 1, 4 )
    
    -- Generate the indent text.
    ret = ret .. r.base .. mw.ustring.rep( r.rep, reps )
    if remainder >= 1 and remainder <= 3 then
        ret = ret .. r[ 'mod' .. remainder ]
    end
    
    return ret
end

return p