From the issue:
> It often happens to me that I carefully craft a selection with multiple
> cursors, ready to make changes elegantly, only to completely mess it
> up by pressing a wrong key (by merging the cursors for example). Being
> able to undo the last selection change (even if only until the previous
> buffer change) would make this much less painful.
Fix this by recording selection changes and allowing simple linear
undo/redo of selection changes.
The preliminary key bindings are <c-h> and <c-k>.
Here are some other vacant normal mode keys I considered
X Y
<backspace> <minus>
# ^ =
<plus> '
unfortunately none of them is super convenient to type. Maybe we
can kick out some other normal mode command?
---
This feature has some overlap with the jump list (<c-o>/<c-i>) and
with undo (u) but each of the three features have their moment.
Currently there's no special integration with either peer feature;
the three histories are completely independent. In future we might
want to synchronize them so we can implement Sublime Text's "Soft
undo" feature.
Note that it is possible to restore selections that predate a buffer
modification. Depending on the buffer modification, the selections
might look different of course. (When trying to apply an old buffer's
selection to the new buffer, Kakoune computes a diff of the buffers
and updates the selection accordingly. This works quite well for
many practical examples.)
This makes us record the full history of all selections for each
client. This seems wasteful, we could set a limit. I don't expect
excessive memory usage in practice (we also keep the full history of
buffer changes) but I could be wrong.
Closes#898
To be able to undo selection changes, we want to record selections
from all commands that modify selections. Each such command will get
its own private copy of the selections object.
This copy will live until the command is finished executing.
All child commands that are run while the command is executing,
will also use the same copy, because to the user it's all just one
selection change anyway.
Add an RAII object in all places where we might modify selections.
The next commit will use this to create the private selections copy
in the constructor (if there is none) and remove redundant history
items in the destructor.
We could avoid the RAII object in some places but that seems worse.
For lifetimes that don't correspond to a lexical scope, we use a
std::unique_ptr. For lambdas that require conversion to std::function,
we use std::shared_ptr because we need something that's copyable.
The next commit changes the selections to a history of
selections. Today we directly access the selections data member. Let's
instead use an accessor method, to reduce the number of changes in
the next commit.
clang/clangd complain about the new HashSet type:
hash_map.cc:98:20: warning: braces around scalar initializer [-Wbraced-scalar-init]
set.insert({10});
^~~~
The argument to HashSet<int>::insert is just an int, so we don't
need braces. Only an actual HashMap would need braces to construct
a HashItem object.
When passing a filename parameter to "write", the -force parameter
allows overwriting an existing file.
The "write!" variant (which allows writing files where the current
user does not have write permissions) already implies -force.
All other variants (like write-quit or write-all) do not take a
file parameter.
Hence -force is relevant only for "write". Let's hide it from the
autoinfo of the other commands.
It's difficult to avoid duplication when constructing the constexpr
SwitchMap because String is not constexpr-enabled. Today, all our
SwitchMap objects are known at compile time, so we could make SwitchMap
use StringView to work around this. In future we might want to allow
adding switches at runtime, which would need String again to avoid
lifetime issues.
As reported in
https://github.com/mawww/kakoune/issues/4685#issuecomment-1200530001
ledger.kak defines a region end that matches every character of
the buffer. This causes performance issues for large buffers.
Since the affected regions are only ever filled with a single color,
just use a regex highlighter instead of a region highlighter.
This improves performance when loading the file for the first time.
Speedup on [example.journal.txt](https://github.com/mawww/kakoune/issues/4685#issuecomment-1193243588)
$ HOME=$PWD hyperfine -w 1 'git checkout HEAD'{~,}' -- :/rc/filetype/ledger.kak && ./kak.opt example.journal.txt -e "modeline-parse; hook global NormalIdle .* quit" -ui dummy'
Benchmark 1: git checkout HEAD~ -- :/rc/filetype/ledger.kak && ./kak.opt example.journal.txt -e "modeline-parse; hook global NormalIdle .* quit" -ui dummy
Time (mean ± σ): 362.1 ms ± 5.1 ms [User: 336.6 ms, System: 30.2 ms]
Range (min … max): 352.6 ms … 369.1 ms 10 runs
Benchmark 2: git checkout HEAD -- :/rc/filetype/ledger.kak && ./kak.opt example.journal.txt -e "modeline-parse; hook global NormalIdle .* quit" -ui dummy
Time (mean ± σ): 271.2 ms ± 16.7 ms [User: 252.8 ms, System: 24.0 ms]
Range (min … max): 253.9 ms … 305.0 ms 10 runs
Summary
'git checkout HEAD -- :/rc/filetype/ledger.kak && ./kak.opt example.journal.txt -e "modeline-parse; hook global NormalIdle .* quit" -ui dummy' ran
1.33 ± 0.08 times faster than 'git checkout HEAD~ -- :/rc/filetype/ledger.kak && ./kak.opt example.journal.txt -e "modeline-parse; hook global NormalIdle .* quit" -ui dummy'
Instead of storing regexes in each regions, move them to the core
highlighter in a hash map so that shared regexes between different
regions are only applied once per update instead of once per region
Also change iteration logic to apply all regex together to each
changed lines to improve memory locality on big buffers.
For the big_markdown.md file described in #4685 this reduces
initial display time from 3.55s to 2.41s on my machine.
This wording was valid for an old version of that patch that foolishly
add a switch to "map" to allow recording history. Happily we found
a better solution. Now commands inside user mappings never add to
prompt history (unless you use "set-register"), so be clear about that.
When I wrote this line I wanted to avoid adding the array size but
I didn't know about make_array().
I had unsuccessfully tried some alternatives, for example
Array{"a", "b", "c"}
which doesn't work because we need StringView (c.f. git blame on
this line)
also
Array<StringView>{"a", "b", "c"}
doesn't work because it's missing a template argument.
This makes the function easier to find for newcomers because
to_string() is the obvious name. It enables format() to do the
conversion automatically which seems like good idea (since there is
no other obvious representation).
Of course this change makes it a bit harder to grep but that's not
a problem with clang tooling.
We need to cast the function in one place when calling transform()
but that's acceptable.
After opening a markdown file
```b
```
```c
int main() {}
```
markdown-load-languages will run an "evaluate-commands -itersel".
The first selection makes us run "require-module b", which fails
because that module can't be found. Since -itersel only ignores the
"no selection remaining" error we fail to run "require-module c". Fix
this by ignoring errors.
Commit d470bd2cc (Make numeric registers setable, 2017-02-14) removed
the user-provided StaticRegister::operator= in favor of a set()
member function, so this comment is no longer valid.
Dockerfiles of the form `Dockerfile.foo-bar` were not detected for syntax
highlighting.
Mainly meaning for this to capture _ and -, but I don't see why we wouldn't
capture any special character.
