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f787a377c3
Supports dark mode. Also re-organize the documentation a bit, making it more hierarchical. Have a nicer landing page
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1.5 KiB
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35 lines
1.5 KiB
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.. _unscroll:
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Unscrolling the screen
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========================
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This is a small extension to the `SD (Pan up) escape code
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<https://vt100.net/docs/vt510-rm/SD.html>`_ from the VT-420 terminal. The
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``SD`` escape code normally causes the text on screen to scroll down by the
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specified number of lines, with empty lines appearing at the top of the screen.
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This extension allows the new lines to be filled in from the scrollback buffer
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instead of being blank.
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The motivation for this is that many modern shells will show completions in a
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block of lines under the cursor, this causes some of the on-screen text to be
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lost even after the completion is completed, because it has scrolled off
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screen. This escape code allows that text to be restored.
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If the scrollback buffer is empty or there is no scrollback buffer, such as for
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the alternate screen, then the newly inserted lines must be empty, just as with
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the original ``SD`` escape code. The maximum number of lines that can be
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scrolled down is implementation defined, but must be at least one screen worth.
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The syntax of the escape code is identical to that of ``SD`` except that it has
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a trailing ``+`` modifier. This is legal under the `ECMA 48 standard
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<https://www.ecma-international.org/publications-and-standards/standards/ecma-48/>`_
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and unused for any other purpose as far as I can tell. So for example, to
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unscroll three lines, the escape code would be::
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CSI 3 + T
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See `discussion here
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<https://gitlab.freedesktop.org/terminal-wg/specifications/-/issues/30>`_.
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.. versionadded:: 0.20.2
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