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    Farthest Frontier

    Carousel returns one of a list of image filenames.

    The index of the one chosen increments every 'switchsecs', which is a parameter giving the number of seconds between switches.

    • switchsecs=3600 would switch every hour
    • switchsecs=43200 would be every 12 hours
    • switchsecs=86400 would be daily (the default)

    Usage[edit source]

    Generic:

    • {{#invoke:carousel | main | name = name-of-data-module | switchsecs = number-of-seconds }}

    Examples:

    • {{#invoke:carousel | main }} for 24 hours between switches using default list
    • {{#invoke:carousel | main | switchsecs = 10}} for 10 sec between switches using default list
    • {{#invoke:carousel | main | name= | switchsecs = 1}} 1 sec between switches using default list
    • {{#invoke:carousel | main | name=Komodobish | switchsecs = 5}} 5 sec using Komodobish's list
    • {{#invoke:carousel | main | name=54129 | switchsecs = 43200}} 12 hours using Serial Number 54129's list

    The image lists are at Special:PrefixIndex/Module:Carousel/, e.g. Module:Carousel/Komodobish for name=Komodobish.

    Typically it will be used with standard image syntax:

    • [[File:{{#invoke:carousel | main | name=Komodobish | switchsecs = 5}} | upright=1.25 | center | thumb | message goes here]]
      message goes here



    p = {}
    
    -- carousel returns one of a list of image filenames
    --
    -- the index of the one chosen increments every 'switchsecs'
    -- which is a parameter giving the number of seconds between switches
    -- 3600 would switch every hour
    -- 43200 would be every 12 hours
    -- 86400 would be daily (the default)
    --
    -- The list of filenames is in a named submodule, so everyone can have their own list.
    -- For Komodobish (the default), the module is [[Module:Carousel/Komodobish]].
    -- For Serial Number 54129, the module is [[Module:Carousel/54129]].
    -- See https://en.wikipedia.org/wiki/Special:PrefixIndex/Module:Carousel/
    --
    -- {{#invoke:carousel | main | name = name-of-datamodule | switchsecs = number-of-seconds }}
    -- {{#invoke:carousel | main | name = 54129 | switchsecs = 10 }} for 10 sec switches using [[Module:Carousel/54129]]
    -- {{#invoke:carousel | main }} for 24 hours between switches using the default data module
    --
    
    p.main = function(frame)
    	-- get parameter switchsecs; if NaN or less than 1, set default
    	local switchtime = tonumber(frame.args.switchsecs) or 86400
    	if switchtime < 1 then switchtime = 86400 end
    
    	-- get parameter dataname; if missing, use default
    	local dataname = frame.args.name or mw.text.trim(frame.args[1]) or ""
    	if dataname == "" then dataname = "Komodobish" end
    
    	-- there should be a named data module as a submodule
    	local imgs = require("Module:Carousel/" .. dataname)
    	local numimgs = #imgs
    
    	-- 'now' increments by 1 every switchtime seconds
    	local now = math.floor( os.time() / switchtime )
    
    	-- set an index between 1 and number of images
    	local idx = now % numimgs + 1
    	return imgs[idx]
    end
    
    return p
    
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