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There was an issue where the lines would be messed up when the terminal
was resized, this was because lines were just added/removed at the end
of the buffer instead of the actual end of the terminal (since the end
of the terminal might be in the middle of the buffer).
This has been fixed by relying on `self.zero` to determine the position
of the start of the terminal and then calculating where lines have to be
inserted/removed.
Some tests have also been added with documentation that should make it
a little easier to understand how the process works and how the raw
buffer is layed out.
This should all work no matter how big the scrollback history and even
when the currenty viewport is not at the bottom of the terminal output.
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There was an issue where alacritty would panic whenever the scrollback
history size is set to 0, this fixes that issue.
The panic was caused by a substraction with unsigned integers which was
underflowing, this has been fixed to use `saturating_sub`.
After that was fixed there was still a bug where scrollback would not
behave correctly because the number of lines in the grid was decided at
startup.
This has been adapted so whenever the size of the terminal changes, the
scrollback history and grid adapts to make sure the number of lines in
the terminal is always the number of visible lines plus the amount of
scrollback lines configured in the config file.
This fixes #1150.
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There was a bug in the display iterator where the first column was never
reached after the top line because it was instantly incremented to 1
after it was reset when iterator column reached the end of the terminal
width.
This has been fixed by making sure that the column is never incremented
when the column is reset due to a change in terminal line.
This fixes #1198.
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BCE was broken in attempt to optimize row clearing. The fix is to revert
to passing in the current cursor state when clearing.
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Some tests are still not passing, though.
A migration script was added to migrate serialized grids from
pre-scrollback to the current format. The script is included with this
commit for completeness, posterity, and as an example to be used in the
future.
A few tests in grid/tests.rs were removed due to becoming irrelevant.
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Resolves #1154
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The different scrolling methods added a bunch of boilerplate where the
call was just forwarded to the next struct, this has been removed by
making the scroll amount into a struct.
Now everything is called through one method and the parameter decides
how far the viewport should be scrolled.
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This offers a few additional hotkeys that can be used in combination
with scrollback. None of these are used by default yet.
This implements the following bindings:
- ScrollPageUp: Scroll exactly one screen height up
- ScrollPageDown: Scroll exactly one screen height down
- ScrollToTop: Scroll as far up as possible
- ScrollToBottom: Scroll as far down as possible
This fixes #1151.
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There was an issue where alacritty tries to convert the lines in a
selection to the on-screen lines even when the selection is not on the
screen. This results in a crash.
To prevent this from happening the selection now is not shown if it is
off the screen.
There currently still is a bug that when the selection is at the top of
the screen but still half visible, it will not show the top line as
selected but start in the second line.
This bug should be resolved with
https://github.com/jwilm/alacritty/pull/1171.
This fixes #1148.
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Selections now *mostly* work. They move as the buffer scrolls, copying
works as it should, and it looks like the different selection modes
behave properly as well.
The new Selection implementation uses buffer coordinates instead of
screen coordinates. This leads to doing a transform from mouse input to
update the selection, and back to screen coordinates when displaying the
selection. Scrolling the selection is fast because the grid is already
operating in buffer coordinates.
There are several bugs to address:
* A _partially_ visible selection will lead to a crash since the drawing
routine converts selection coordinates to screen coordinates. The
solution will be to clip the coordinates at draw time.
* A selection scrolling off the buffer in either direction leads to
indexing out-of-bounds. The solution again is to clip, but this needs
to be done within Selection::rotate by passing a max limit. It may
also need a return type to indicate that the selection is no longer
visible and should be discarded.
* A selection scrolling out of a logical scrolling region is not
clipped. A temporary and robust workaround is to simply discard the
selection in the case of scrolling in a region.
wip selections
fix issue with line selection
selection mostly working
need to support selection not being on the screen at draw time
Fix selection_to_string
Uncomment tests
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Supporting selections with scrollback has two major components:
1. Grid needs access to Selection so that it may update the scroll
position as the terminal text changes.
2. Selection needs to be implemented in terms of buffer offsets -- NOT
lines -- and be updated when Storage is rotated.
This commit implements the first part.
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Things that do not work
- Limiting how far back in the buffer it's possible to scroll
- Selections (need to transform to buffer offsets)
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This intends to optimize the case where the top of the scrolling region
is the top of the screen. In theory, scrolling in this case can be
optimized to shifting the start/end of the visible region, and then
rearranging any lines that were not supposed to be scrolled (at the
bottom of the region). However, this didn't produce quite the speedup I
expected.
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In addition to a marginal performance improvement, this simplifies some
logic in the Term implementation since now the Grid fully handles row
recycling.
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This is part of some cleanup for the grid module as a whole.
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