basnijholt

//@version=4
study(title="CTO Line", shorttitle="CTO", overlay=true, resolution="")
smma(src, length) =>
    smma = 0.0
    smma := na(smma[1]) ? sma(src, length) : (smma[1] * (length - 1) + src) / length
    smma
v1 = smma(hl2, 15)
m1 = smma(hl2, 19)
m2 = smma(hl2, 25)
v2 = smma(hl2, 29)

emotality

NOTE (2022-07-09): Xcode finally added this functionality in Xcode 14, please see release notes here:

New Features in Xcode 14 Beta 3
When editing code, the Edit > Duplicate menu item and its corresponding keyboard shortcut now duplicate the selected text — or the line that currently contains the insertion point, if no text is selected. (8614499) (FB5618491)

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Xcode line duplicate

Bind keys to duplicate lines in Xcode