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Revert "Switch undo storage from a tree to a plain list"

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Moving across history moved to <c-j>/<c-k> to keep <a-u>/<a-U>
for selection undo/redo

This reverts commit e0d33f51b3.
This commit is contained in:
Maxime Coste 2023-06-17 17:30:43 +10:00
parent b2a853cfc2
commit 5901d2e06b
10 changed files with 184 additions and 78 deletions
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2
README.asciidoc
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@ -540,7 +540,9 @@ Changes
* `<a-!>`: append command output after each selection
* `u`: undo last change
* `<c-k>`: move backward in history
* `U`: redo last change
* `<c-f>`: move forward in history
* `&`: align selections, align the cursor of selections by inserting
spaces before the first character of the selection

16
doc/pages/expansions.asciidoc
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@ -285,13 +285,15 @@ The following expansions are supported (with required context _in italics_):
*%val{history}*::
_in buffer, window scope_ +
the full change history of the buffer, as a list of
`committed modification0 modification1 ...` entries.
_committed_ is a count in seconds from Kakoune's steady clock's epoch of
the creation of the history entry, and each _modification_ is presented
as in `%val{uncommitted_modifications}`.
Boundaries in the list can be identified knowing that _committed_ is a
plain integer, and each _modification_ starts with `+` or `-`.
the full change history of the buffer, including undo forks, in terms
of `parent committed redo_child modification0 modification1 ...`
entries, where _parent_ is the index of the entry's predecessor (entry
0, which is the root of the history tree, will always have `-` here),
_committed_ is a count in seconds from Kakoune's steady clock's epoch
of the creation of the history entry, _redo_child_ is the index of the
child which will be visited for `U` (always `-` at the leaves of the
history), and each _modification_ is presented as in
`%val{uncommitted_modifications}`.
*%val{history_id}*::
_in buffer, window scope_ +

6
doc/pages/keys.asciidoc
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@ -308,6 +308,12 @@ Yanking (copying) and pasting use the *"* register by default (See <<registers#,
*U*::
redo last change
*<c-j>*::
move forward in changes history
*<c-k>*::
move forward in changes history
*<a-u>*::
undo last selection change

173
src/buffer.cc
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@ -20,8 +20,8 @@
namespace Kakoune
{
Buffer::HistoryNode::HistoryNode()
: committed{Clock::now()}
Buffer::HistoryNode::HistoryNode(HistoryId parent)
: parent{parent}, committed{Clock::now()}
{}
Buffer::Buffer(String name, Flags flags, BufferLines lines,
@ -31,9 +31,9 @@ Buffer::Buffer(String name, Flags flags, BufferLines lines,
m_name{(flags & Flags::File) ? real_path(parse_filename(name)) : std::move(name)},
m_display_name{(flags & Flags::File) ? compact_path(m_name) : m_name},
m_flags{flags | Flags::NoUndo},
m_history{{HistoryNode{}}},
m_history_id{0},
m_last_save_history_id{0},
m_history{{HistoryId::Invalid}},
m_history_id{HistoryId::First},
m_last_save_history_id{HistoryId::First},
m_fs_status{fs_status}
{
#ifdef KAK_DEBUG
@ -114,7 +114,7 @@ bool Buffer::set_name(String name)
if (m_flags & Buffer::Flags::File and not file_exists(m_name))
{
m_flags |= Buffer::Flags::New;
m_last_save_history_id = InvalidHistoryId;
m_last_save_history_id = HistoryId::Invalid;
}
}
else
@ -201,9 +201,9 @@ void Buffer::reload(BufferLines lines, ByteOrderMark bom, EolFormat eolformat, F
if (not record_undo)
{
// Erase history about to be invalidated history
m_history_id = 0;
m_last_save_history_id = 0;
m_history = {HistoryNode{}};
m_history_id = HistoryId::First;
m_last_save_history_id = HistoryId::First;
m_history = {HistoryNode{HistoryId::Invalid}};
m_changes.push_back({ Change::Erase, {0,0}, line_count() });
static_cast<BufferLines&>(m_lines) = std::move(lines);
@ -273,20 +273,12 @@ void Buffer::commit_undo_group()
if (m_current_undo_group.empty())
return;
// walk back to current position in history, and append reverse events
for (size_t current = m_history.size() - 1; current != m_history_id ; --current)
{
m_history.emplace_back();
m_history.back().undo_group = m_history[current].undo_group
| reverse()
| transform([](auto& modif) { return modif.inverse(); })
| gather<UndoGroup>();
}
m_history.emplace_back();
const HistoryId id = next_history_id();
m_history.push_back({m_history_id});
m_history.back().undo_group = std::move(m_current_undo_group);
m_current_undo_group.clear();
m_history_id = m_history.size() - 1;
current_history_node().redo_child = id;
m_history_id = id;
}
bool Buffer::undo(size_t count)
@ -295,15 +287,15 @@ bool Buffer::undo(size_t count)
commit_undo_group();
if ((m_history_id - 1) == InvalidHistoryId)
if (current_history_node().parent == HistoryId::Invalid)
return false;
while (count-- != 0 and (m_history_id - 1) != InvalidHistoryId)
while (count-- != 0 and current_history_node().parent != HistoryId::Invalid)
{
for (const Modification& modification : current_history_node().undo_group | reverse())
apply_modification(modification.inverse());
m_history_id--;
m_history_id = current_history_node().parent;
}
return true;
@ -313,19 +305,79 @@ bool Buffer::redo(size_t count)
{
throw_if_read_only();
if (m_history_id == (m_history.size() - 1))
if (current_history_node().redo_child == HistoryId::Invalid)
return false;
kak_assert(m_current_undo_group.empty());
while (count-- != 0 and m_history_id != (m_history.size() - 1))
while (count-- != 0 and current_history_node().redo_child != HistoryId::Invalid)
{
m_history_id++;
m_history_id = current_history_node().redo_child;
for (const Modification& modification : current_history_node().undo_group)
apply_modification(modification);
}
return true;
}
bool Buffer::move_to(HistoryId id)
{
if (id >= next_history_id())
return false;
throw_if_read_only();
commit_undo_group();
auto find_lowest_common_parent = [this](HistoryId a, HistoryId b) {
auto depth_of = [this](HistoryId id) {
size_t depth = 0;
for (; history_node(id).parent != HistoryId::Invalid; id = history_node(id).parent)
++depth;
return depth;
};
auto depthA = depth_of(a), depthB = depth_of(b);
for (; depthA > depthB; --depthA)
a = history_node(a).parent;
for (; depthB > depthA; --depthB)
b = history_node(b).parent;
while (a != b)
{
a = history_node(a).parent;
b = history_node(b).parent;
}
kak_assert(a == b and a != HistoryId::Invalid);
return a;
};
auto parent = find_lowest_common_parent(m_history_id, id);
// undo up to common parent
for (auto id = m_history_id; id != parent; id = history_node(id).parent)
{
for (const Modification& modification : history_node(id).undo_group | reverse())
apply_modification(modification.inverse());
}
static void (*apply_from_parent)(Buffer&, HistoryId, HistoryId) =
[](Buffer& buffer, HistoryId parent, HistoryId id) {
if (id == parent)
return;
auto& node = buffer.history_node(id);
apply_from_parent(buffer, parent, node.parent);
buffer.history_node(node.parent).redo_child = id;
for (const Modification& modification : node.undo_group)
buffer.apply_modification(modification);
};
apply_from_parent(*this, parent, id);
m_history_id = id;
return true;
}
@ -594,7 +646,7 @@ void Buffer::run_hook_in_own_context(Hook hook, StringView param, String client_
Optional<BufferCoord> Buffer::last_modification_coord() const
{
if (m_history_id == 0)
if (m_history_id == HistoryId::First)
return {};
return current_history_node().undo_group.back().coord;
}
@ -682,49 +734,50 @@ UnitTest test_undo{[]()
buffer.insert(2_line, "tchou\n"); // change 3
buffer.commit_undo_group();
buffer.undo();
buffer.insert(2_line, "mutch\n"); // change 4 (inverse of 3) and 5
buffer.insert(2_line, "mutch\n"); // change 4
buffer.commit_undo_group();
buffer.erase({2, 1}, {2, 5}); // change 6
buffer.erase({2, 1}, {2, 5}); // change 5
buffer.commit_undo_group();
buffer.undo(2);
buffer.redo(2);
buffer.undo();
buffer.replace(2_line, buffer.end_coord(), "foo"); // change 7 (inverse of 6) and 8
buffer.replace(2_line, buffer.end_coord(), "foo"); // change 6
buffer.commit_undo_group();
kak_assert(buffer.history().size() == 9);
kak_assert((int)buffer.line_count() == 3);
kak_assert(buffer[0_line] == "allo ?\n");
kak_assert(buffer[1_line] == "mais que fais la police\n");
kak_assert(buffer[2_line] == "foo\n");
auto check_content = [&](const Vector<StringView>& lines) {
kak_assert(buffer.line_count() == lines.size());
for (size_t i = 0; i < lines.size(); ++i)
kak_assert(buffer[i] == lines[i] + "\n");
};
buffer.move_to((Buffer::HistoryId)3);
kak_assert((int)buffer.line_count() == 5);
kak_assert(buffer[0_line] == "allo ?\n");
kak_assert(buffer[1_line] == "mais que fais la police\n");
kak_assert(buffer[2_line] == "tchou\n");
kak_assert(buffer[3_line] == " hein ?\n");
kak_assert(buffer[4_line] == " youpi\n");
kak_assert(not buffer.redo(1));
check_content({ "allo ?", "mais que fais la police", "foo" , });
kak_assert(buffer.undo(1));
check_content({ "allo ?", "mais que fais la police", "mutch" , " hein ?", " youpi", });
kak_assert(buffer.undo(1));
check_content({ "allo ?", "mais que fais la police", "m" , " hein ?", " youpi", });
kak_assert(buffer.undo(1));
check_content({ "allo ?", "mais que fais la police", "mutch" , " hein ?", " youpi", });
kak_assert(buffer.undo(1));
check_content({ "allo ?", "mais que fais la police", " hein ?", " youpi" , });
kak_assert(buffer.undo(1));
check_content({ "allo ?", "mais que fais la police", "tchou" , " hein ?", " youpi", });
kak_assert(buffer.undo(1));
check_content({ "allo ?", "mais que fais la police", " hein ?", " youpi" , });
kak_assert(buffer.undo(1));
check_content({ "allo ?", "mais que fais la police", " hein ?", " youpi" , "kanaky", });
kak_assert(buffer.undo(1));
check_content({ "allo ?", "mais que fais la police", " hein ?", " youpi" , });
kak_assert(not buffer.undo(1));
buffer.move_to((Buffer::HistoryId)4);
kak_assert((int)buffer.line_count() == 5);
kak_assert(buffer[0_line] == "allo ?\n");
kak_assert(buffer[1_line] == "mais que fais la police\n");
kak_assert(buffer[2_line] == "mutch\n");
kak_assert(buffer[3_line] == " hein ?\n");
kak_assert(buffer[4_line] == " youpi\n");
kak_assert(buffer.redo(1000));
check_content({ "allo ?", "mais que fais la police", "foo" , });
buffer.move_to(Buffer::HistoryId::First);
kak_assert((int)buffer.line_count() == 4);
kak_assert(buffer[0_line] == "allo ?\n");
kak_assert(buffer[1_line] == "mais que fais la police\n");
kak_assert(buffer[2_line] == " hein ?\n");
kak_assert(buffer[3_line] == " youpi\n");
kak_assert(not buffer.undo());
kak_assert(buffer.undo(1000));
check_content({ "allo ?", "mais que fais la police", " hein ?", " youpi" , });
buffer.move_to((Buffer::HistoryId)5);
kak_assert(not buffer.redo());
buffer.move_to((Buffer::HistoryId)6);
kak_assert(not buffer.redo());
}};
}

23
src/buffer.hh
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@ -123,6 +123,8 @@ public:
};
friend constexpr bool with_bit_ops(Meta::Type<Flags>) { return true; }
enum class HistoryId : size_t { First = 0, Invalid = (size_t)-1 };
Buffer(String name, Flags flags, BufferLines lines,
ByteOrderMark bom = ByteOrderMark::None,
EolFormat eolformat = EolFormat::Lf,
@ -148,7 +150,9 @@ public:
void commit_undo_group();
bool undo(size_t count = 1);
bool redo(size_t count = 1);
size_t current_history_id() const noexcept { return m_history_id; }
bool move_to(HistoryId id);
HistoryId current_history_id() const noexcept { return m_history_id; }
HistoryId next_history_id() const noexcept { return (HistoryId)m_history.size(); }
String string(BufferCoord begin, BufferCoord end) const;
StringView substr(BufferCoord begin, BufferCoord end) const;
@ -241,14 +245,14 @@ public:
struct HistoryNode : UseMemoryDomain<MemoryDomain::BufferMeta>
{
HistoryNode();
HistoryNode(HistoryId parent);
HistoryId parent;
HistoryId redo_child = HistoryId::Invalid;
TimePoint committed;
UndoGroup undo_group;
};
static constexpr size_t InvalidHistoryId = (size_t)-1;
const Vector<HistoryNode>& history() const { return m_history; }
const UndoGroup& current_undo_group() const { return m_current_undo_group; }
@ -259,6 +263,7 @@ private:
BufferCoord do_erase(BufferCoord begin, BufferCoord end);
void apply_modification(const Modification& modification);
void revert_modification(const Modification& modification);
struct LineList : BufferLines
{
@ -284,12 +289,14 @@ private:
Flags m_flags;
Vector<HistoryNode> m_history;
size_t m_history_id = InvalidHistoryId;
size_t m_last_save_history_id = InvalidHistoryId;
HistoryId m_history_id = HistoryId::Invalid;
HistoryId m_last_save_history_id = HistoryId::Invalid;
UndoGroup m_current_undo_group;
HistoryNode& current_history_node() { return m_history[m_history_id]; }
const HistoryNode& current_history_node() const { return m_history[m_history_id]; }
HistoryNode& history_node(HistoryId id) { return m_history[(size_t)id]; }
const HistoryNode& history_node(HistoryId id) const { return m_history[(size_t)id]; }
HistoryNode& current_history_node() { return m_history[(size_t)m_history_id]; }
const HistoryNode& current_history_node() const { return m_history[(size_t)m_history_id]; }
Vector<Change, MemoryDomain::BufferMeta> m_changes;

10
src/buffer_utils.cc
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@ -301,6 +301,14 @@ void write_to_debug_buffer(StringView str)
}
auto to_string(Buffer::HistoryId id)
{
using Result = decltype(to_string(size_t{}));
if (id == Buffer::HistoryId::Invalid)
return Result{1, "-"};
return to_string(static_cast<size_t>(id));
}
static String modification_as_string(const Buffer::Modification& modification)
{
return format("{}{}.{}|{}",
@ -315,7 +323,9 @@ Vector<String> history_as_strings(const Vector<Buffer::HistoryNode>& history)
for (auto& node : history)
{
auto seconds = std::chrono::duration_cast<std::chrono::seconds>(node.committed.time_since_epoch());
res.push_back(to_string(node.parent));
res.push_back(to_string(seconds.count()));
res.push_back(to_string(node.redo_child));
for (auto& modification : node.undo_group)
res.push_back(modification_as_string(modification));
};

3
src/main.cc
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@ -45,7 +45,8 @@ struct {
StringView notes;
} constexpr version_notes[] = { {
0,
"» History is now stored linearly instead of in a tree\n"
"» Selection undo/redo moved to {+b}<a-u>{}/{+b}<a-U>{} "
"and moving in history tree to {+b}<c-k>{}/{+b}c-j>{}\n"
"» {+b}<a-u>{} and {+b}<a-U>{} now undo selection history\n"
"» {+u}%exp\\{...}{} expansions provide flexible quoting for expanded "
"strings (as double quoted strings)\n"

25
src/normal.cc
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@ -2010,6 +2010,29 @@ void redo(Context& context, NormalParams params)
throw runtime_error("nothing left to redo");
}
template<Direction direction>
void move_in_history(Context& context, NormalParams params)
{
Buffer& buffer = context.buffer();
size_t timestamp = buffer.timestamp();
const int count = std::max(1, params.count);
const int history_id = (size_t)buffer.current_history_id() + direction * count;
const int max_history_id = (int)buffer.next_history_id() - 1;
if (buffer.move_to((Buffer::HistoryId)history_id))
{
auto ranges = compute_modified_ranges(buffer, timestamp);
if (not ranges.empty())
context.selections_write_only() = std::move(ranges);
context.print_status({ format("moved to change #{} ({})",
history_id, max_history_id),
context.faces()["Information"] });
}
else
throw runtime_error(format("no such change: #{} ({})",
history_id, max_history_id));
}
template<Direction direction>
void undo_selection_change(Context& context, NormalParams params)
{
@ -2339,6 +2362,8 @@ static constexpr HashMap<Key, NormalCmd, MemoryDomain::Undefined, KeymapBackend>
{ {'u'}, {"undo", undo} },
{ {'U'}, {"redo", redo} },
{ {ctrl('k')}, {"move backward in history", move_in_history<Direction::Backward>} },
{ {ctrl('j')}, {"move forward in history", move_in_history<Direction::Forward>} },
{ {alt('u')}, {"undo selection change", undo_selection_change<Backward>} },
{ {alt('U')}, {"redo selection change", undo_selection_change<Forward>} },

2
test/compose/history/kak_quoted_history
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@ -1 +1 @@
'$timestamp' '$timestamp' '+0.5|m' '+0.6|i' '+0.7|d' '+0.8|d' '+0.9|l' '+0.10|e' '-0.8|dle'
'-' '$timestamp' '1' '0' '$timestamp' '-' '+0.5|m' '+0.6|i' '+0.7|d' '+0.8|d' '+0.9|l' '+0.10|e' '-0.8|dle'

2
test/compose/history/rc
View File

@ -1,6 +1,6 @@
# Make our expansion have a predictable timestamp
hook global ClientClose .* %{
nop %sh{
kak -f 'ghlwc$timestamp<esc>1f<space>lwc$timestamp<esc>' kak_quoted_history
kak -f 'ghf<space>lwc$timestamp<esc>3f<space>lwc$timestamp<esc>' kak_quoted_history
}
}