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    Farthest Frontier

    Lua error in Module:Lua_banner at line 113: attempt to index field 'edit' (a nil value). Lua error in Module:TNT at line 166: Missing Commons dataset I18n/Module:TNT.tab.

    This module implements {{if preview}} and {{preview warning}}. It helps templates/modules determine if they are being previewed.

    Prefer implementing the template versions in other templates.

    In a module to use the main(), you need to pass a frame table with an args table.

    For the preview warning, use _warning().



    local p = {}
    
    local cfg = mw.loadData('Module:If preview/configuration')
    
    --[[
    main
    
    This function returns either the first argument or second argument passed to
    this module, depending on whether the page is being previewed.
    
    ]]
    function p.main(frame)
    	if cfg.preview then
    		return frame.args[1] or ''
    	else
    		return frame.args[2] or ''
    	end
    end
    
    --[[
    pmain
    
    This function returns either the first argument or second argument passed to
    this module's parent (i.e. template using this module), depending on whether it
    is being previewed.
    
    ]]
    function p.pmain(frame)
    	return p.main(frame:getParent())
    end
    
    
    local function warning_text(warning)
    	return mw.ustring.format(
    		cfg.warning_infrastructure,
    		cfg.templatestyles,
    		warning
    	)
    end
    
    function p._warning(args)
    	
    	local warning = args[1] and args[1]:match('^%s*(.-)%s*$') or ''
    	if warning == '' then
    		return warning_text(cfg.missing_warning)
    	end
    	
    	if not cfg.preview then return '' end
    	
    	return warning_text(warning)
    end
    
    --[[
    warning
    
    This function returns a "preview warning", which is the first argument marked
    up with HTML and some supporting text, depending on whether the page is being previewed.
    
    disabled since we'll implement the template version in general
    
    ]]
    --function p.warning(frame)
    --	return p._warning(frame.args)
    --end
    
    --[[
    warning, but for pass-through templates like {{preview warning}}
    ]]
    function p.pwarning(frame)
    	return p._warning(frame:getParent().args)
    end
    
    return p
    
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