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Command.cc: share the word scans, search reset and completion prefix

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Word motion (M-b/M-f) and word deletion (M-Backspace/M-d) each carried a
copy of the same backward and forward scans; word_back and word_forward
now serve both. Deleting N words backwards built the kill text by
prepending each piece (quadratic in N); the pieces are joined once. The
five-call search reset appeared nine times (end_search), and the
completion longest-common-prefix loop twice (keep_common_prefix).

A new test pins word motion and deletion with counts across line ends
and punctuation; it gives the same results on the code before this
change.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015rcVQiiWyTzoNrsvLSaAfB
This commit is contained in:
Claude
2026-09-24 12:19:59 -07:00
committed by Kyle Isom
parent 95bcf8ef09
commit 7039c14507
2 changed files with 183 additions and 196 deletions
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Command.cc
+131 -196
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@@ -243,6 +243,29 @@ ensure_cursor_visible(const Editor &ed, Buffer &buf)
}
// Shorten prefix to the part it shares with s (completion).
static void
keep_common_prefix(std::string &prefix, std::string_view s)
{
std::size_t j = 0;
while (j < prefix.size() && j < s.size() && prefix[j] == s[j])
++j;
prefix.resize(j);
}
// Leave search mode entirely: no active search, query, match or origin.
static void
end_search(Editor &ed)
{
ed.SetSearchActive(false);
ed.SetSearchQuery("");
ed.SetSearchMatch(0, 0, 0);
ed.ClearSearchOrigin();
ed.SetSearchIndex(-1);
}
static bool
cmd_new_window(CommandContext &ctx)
{
@@ -1512,11 +1535,7 @@ cmd_refresh(CommandContext &ctx)
buf->SetCursor(ctx.editor.SearchOrigX(), ctx.editor.SearchOrigY());
buf->SetOffsets(ctx.editor.SearchOrigRowoffs(), ctx.editor.SearchOrigColoffs());
}
ctx.editor.SetSearchActive(false);
ctx.editor.SetSearchQuery("");
ctx.editor.SetSearchMatch(0, 0, 0);
ctx.editor.ClearSearchOrigin();
ctx.editor.SetSearchIndex(-1);
end_search(ctx.editor);
}
// Clear any pending close/overwrite state associated with prompts
ctx.editor.SetCloseConfirmPending(false);
@@ -1534,11 +1553,7 @@ cmd_refresh(CommandContext &ctx)
buf->SetCursor(ctx.editor.SearchOrigX(), ctx.editor.SearchOrigY());
buf->SetOffsets(ctx.editor.SearchOrigRowoffs(), ctx.editor.SearchOrigColoffs());
}
ctx.editor.SetSearchActive(false);
ctx.editor.SetSearchQuery("");
ctx.editor.SetSearchMatch(0, 0, 0);
ctx.editor.ClearSearchOrigin();
ctx.editor.SetSearchIndex(-1);
end_search(ctx.editor);
ctx.editor.SetStatus("Find canceled");
return true;
}
@@ -2416,15 +2431,8 @@ cmd_insert_text(CommandContext &ctx)
} else {
// extend to longest common prefix
std::string lcp = cands[0].first;
for (std::size_t i = 1; i < cands.size(); ++i) {
const std::string &s = cands[i].first;
std::size_t j = 0;
while (j < lcp.size() && j < s.size() && lcp[j] == s[j])
++j;
lcp.resize(j);
if (lcp.empty())
break;
}
for (std::size_t i = 1; i < cands.size() && !lcp.empty(); ++i)
keep_common_prefix(lcp, cands[i].first);
if (!lcp.empty() && lcp != ctx.editor.PromptText())
ctx.editor.SetPromptText(lcp);
}
@@ -2493,16 +2501,9 @@ cmd_insert_text(CommandContext &ctx)
ctx.editor.SetPromptText(cands[0]);
} else {
// Longest common prefix of display strings
auto lcp = cands[0];
for (size_t i = 1; i < cands.size(); ++i) {
const auto &s = cands[i];
size_t j = 0;
while (j < lcp.size() && j < s.size() && lcp[j] == s[j])
++j;
lcp.resize(j);
if (lcp.empty())
break;
}
std::string lcp = cands[0];
for (std::size_t i = 1; i < cands.size() && !lcp.empty(); ++i)
keep_common_prefix(lcp, cands[i]);
if (!lcp.empty() && lcp != ctx.editor.PromptText()) {
ctx.editor.SetPromptText(lcp);
} else {
@@ -3094,11 +3095,7 @@ cmd_newline(CommandContext &ctx)
if (buf->IsReadOnly()) {
ctx.editor.SetStatus("Read-only buffer");
// Clear search UI state
ctx.editor.SetSearchActive(false);
ctx.editor.SetSearchQuery("");
ctx.editor.SetSearchMatch(0, 0, 0);
ctx.editor.ClearSearchOrigin();
ctx.editor.SetSearchIndex(-1);
end_search(ctx.editor);
return true;
}
const std::string find = ctx.editor.ReplaceFindTmp();
@@ -3107,11 +3104,7 @@ cmd_newline(CommandContext &ctx)
if (find.empty()) {
ctx.editor.SetStatus("Replace canceled (empty find)");
// Clear search UI state
ctx.editor.SetSearchActive(false);
ctx.editor.SetSearchQuery("");
ctx.editor.SetSearchMatch(0, 0, 0);
ctx.editor.ClearSearchOrigin();
ctx.editor.SetSearchIndex(-1);
end_search(ctx.editor);
return true;
}
// Save original cursor to restore after operations
@@ -3154,11 +3147,7 @@ cmd_newline(CommandContext &ctx)
std::snprintf(msg, sizeof(msg), "Replaced %zu occurrence%s", total, (total == 1 ? "" : "s"));
ctx.editor.SetStatus(msg);
// Clear search-highlighting state after replace completes
ctx.editor.SetSearchActive(false);
ctx.editor.SetSearchQuery("");
ctx.editor.SetSearchMatch(0, 0, 0);
ctx.editor.ClearSearchOrigin();
ctx.editor.SetSearchIndex(-1);
end_search(ctx.editor);
return true;
} else if (kind == Editor::PromptKind::OpenFile) {
// Expand "~" to the user's home directory
@@ -3530,11 +3519,7 @@ cmd_newline(CommandContext &ctx)
if (buf->IsReadOnly()) {
ctx.editor.SetStatus("Read-only buffer");
// Clear search UI state
ctx.editor.SetSearchActive(false);
ctx.editor.SetSearchQuery("");
ctx.editor.SetSearchMatch(0, 0, 0);
ctx.editor.ClearSearchOrigin();
ctx.editor.SetSearchIndex(-1);
end_search(ctx.editor);
return true;
}
const std::string patt = ctx.editor.ReplaceFindTmp();
@@ -3542,11 +3527,7 @@ cmd_newline(CommandContext &ctx)
ctx.editor.SetReplaceWithTmp(repl);
if (patt.empty()) {
ctx.editor.SetStatus("Regex replace canceled (empty pattern)");
ctx.editor.SetSearchActive(false);
ctx.editor.SetSearchQuery("");
ctx.editor.SetSearchMatch(0, 0, 0);
ctx.editor.ClearSearchOrigin();
ctx.editor.SetSearchIndex(-1);
end_search(ctx.editor);
return true;
}
kte::Regex rx;
@@ -3554,11 +3535,7 @@ cmd_newline(CommandContext &ctx)
if (!rx.Compile(patt, rx_err)) {
ctx.editor.SetStatus("Regex error: " + rx_err);
// Clear search UI state
ctx.editor.SetSearchActive(false);
ctx.editor.SetSearchQuery("");
ctx.editor.SetSearchMatch(0, 0, 0);
ctx.editor.ClearSearchOrigin();
ctx.editor.SetSearchIndex(-1);
end_search(ctx.editor);
return true;
}
std::size_t changed = 0;
@@ -3597,11 +3574,7 @@ cmd_newline(CommandContext &ctx)
ctx.editor.SetStatus("Regex replaced in " + std::to_string(changed) + " line(s)" +
(limited ? " (pattern too complex on some lines; those left as they were)" : ""));
// Clear search UI state
ctx.editor.SetSearchActive(false);
ctx.editor.SetSearchQuery("");
ctx.editor.SetSearchMatch(0, 0, 0);
ctx.editor.ClearSearchOrigin();
ctx.editor.SetSearchIndex(-1);
end_search(ctx.editor);
if (auto *b = ctx.editor.CurrentBuffer())
ensure_cursor_visible(ctx.editor, *b);
return true;
@@ -4763,6 +4736,87 @@ is_word_char(unsigned char c)
}
// One word back from (x, y), y < rows.size(): past whitespace (across line
// ends), then to the start of the word. False at the start of the buffer.
static bool
word_back(const RowsView &rows, std::size_t &x, std::size_t &y)
{
// If at start of line and not first line, move to end of previous line
if (x == 0) {
if (y == 0)
return false;
--y;
x = rows[y].size();
}
// Move left one first
if (x > 0)
--x;
// Skip any whitespace leftwards
while (y < rows.size() && (x > 0 || (x == 0 && y > 0))) {
if (x == 0) {
--y;
x = rows[y].size();
if (x == 0)
continue;
}
unsigned char c = x > 0 ? static_cast<unsigned char>(rows[y][x - 1]) : 0;
if (!std::isspace(c))
break;
--x;
}
// Skip word characters leftwards
while (y < rows.size() && (x > 0 || (x == 0 && y > 0))) {
if (x == 0)
break;
unsigned char c = static_cast<unsigned char>(rows[y][x - 1]);
if (!is_word_char(c))
break;
--x;
}
return true;
}
// One word forward from (x, y): to the end of the word under the cursor,
// then past non-word characters (across line ends) to the next word.
static void
word_forward(const RowsView &rows, std::size_t &x, std::size_t &y)
{
// First, if currently on a word, skip to its end
while (y < rows.size()) {
if (x < rows[y].size() && is_word_char(static_cast<unsigned char>(rows[y][x]))) {
++x;
continue;
}
if (x >= rows[y].size()) {
if (y + 1 >= rows.size())
break;
++y;
x = 0;
continue;
}
break;
}
// Then, skip any non-word characters (including punctuation and whitespace)
while (y < rows.size()) {
if (x < rows[y].size()) {
unsigned char c = static_cast<unsigned char>(rows[y][x]);
if (is_word_char(c))
break;
++x;
continue;
}
if (x >= rows[y].size()) {
if (y + 1 >= rows.size())
break;
++y;
x = 0;
continue;
}
}
}
static bool
cmd_word_prev(CommandContext &ctx)
{
@@ -4781,38 +4835,8 @@ cmd_word_prev(CommandContext &ctx)
y = rows.empty() ? 0 : rows.size() - 1;
x = rows[y].size();
}
// If at start of line and not first line, move to end of previous line
if (x == 0) {
if (y == 0)
break;
--y;
x = rows[y].size();
}
// Move left one first
if (x > 0)
--x;
// Skip any whitespace leftwards
while (y < rows.size() && (x > 0 || (x == 0 && y > 0))) {
if (x == 0) {
--y;
x = rows[y].size();
if (x == 0)
continue;
}
unsigned char c = x > 0 ? static_cast<unsigned char>(rows[y][x - 1]) : 0;
if (!std::isspace(c))
break;
--x;
}
// Skip word characters leftwards
while (y < rows.size() && (x > 0 || (x == 0 && y > 0))) {
if (x == 0)
break;
unsigned char c = static_cast<unsigned char>(rows[y][x - 1]);
if (!is_word_char(c))
break;
--x;
}
if (!word_back(rows, x, y))
break;
}
buf->SetCursor(x, y);
ensure_cursor_visible(ctx.editor, *buf);
@@ -4836,38 +4860,7 @@ cmd_word_next(CommandContext &ctx)
while (repeat-- > 0) {
if (y >= rows.size())
break;
// First, if currently on a word, skip to its end
while (y < rows.size()) {
if (x < rows[y].size() && is_word_char(static_cast<unsigned char>(rows[y][x]))) {
++x;
continue;
}
if (x >= rows[y].size()) {
if (y + 1 >= rows.size())
break;
++y;
x = 0;
continue;
}
break;
}
// Then, skip any non-word characters (including punctuation and whitespace)
while (y < rows.size()) {
if (x < rows[y].size()) {
unsigned char c = static_cast<unsigned char>(rows[y][x]);
if (is_word_char(c))
break;
++x;
continue;
}
if (x >= rows[y].size()) {
if (y + 1 >= rows.size())
break;
++y;
x = 0;
continue;
}
}
word_forward(rows, x, y);
}
buf->SetCursor(x, y);
ensure_cursor_visible(ctx.editor, *buf);
@@ -4888,7 +4881,7 @@ cmd_delete_word_prev(CommandContext &ctx)
std::size_t y = buf->Cury();
std::size_t x = buf->Curx();
int repeat = ctx.count > 0 ? ctx.count : 1;
std::string killed_total;
std::vector<std::string> killed;
UndoGroupGuard guard(buf->Undo());
for (int i = 0; i < repeat; ++i) {
if (y >= rows.size()) {
@@ -4897,44 +4890,17 @@ cmd_delete_word_prev(CommandContext &ctx)
}
std::size_t start_y = y;
std::size_t start_x = x;
// If at start of line and not first line, move to end of previous line
if (x == 0) {
if (y == 0)
break;
--y;
x = rows[y].size();
}
// Move left one first
if (x > 0)
--x;
// Skip any whitespace leftwards
while (y < rows.size() && (x > 0 || (x == 0 && y > 0))) {
if (x == 0) {
--y;
x = rows[y].size();
if (x == 0)
continue;
}
unsigned char c = x > 0 ? static_cast<unsigned char>(rows[y][x - 1]) : 0;
if (!std::isspace(c))
break;
--x;
}
// Skip word characters leftwards
while (y < rows.size() && (x > 0 || (x == 0 && y > 0))) {
if (x == 0)
break;
unsigned char c = static_cast<unsigned char>(rows[y][x - 1]);
if (!is_word_char(c))
break;
--x;
}
if (!word_back(rows, x, y))
break;
// Now delete from (x, y) to (start_x, start_y) using PieceTable
std::string deleted = extract_region_text(*buf, x, y, start_x, start_y);
killed.push_back(extract_region_text(*buf, x, y, start_x, start_y));
delete_region(*buf, x, y, start_x, start_y, buf->Undo());
// Prepend to killed_total (since we're deleting backwards)
killed_total = deleted + killed_total;
}
// Deleted backwards: the last piece comes first (joined once; prepending
// each piece was quadratic in the repeat count).
std::string killed_total;
for (auto it = killed.rbegin(); it != killed.rend(); ++it)
killed_total += *it;
buf->SetCursor(x, y);
buf->SetDirty(true);
ensure_cursor_visible(ctx.editor, *buf);
@@ -4969,38 +4935,7 @@ cmd_delete_word_next(CommandContext &ctx)
break;
std::size_t start_y = y;
std::size_t start_x = x;
// First, if currently on a word, skip to its end
while (y < rows.size()) {
if (x < rows[y].size() && is_word_char(static_cast<unsigned char>(rows[y][x]))) {
++x;
continue;
}
if (x >= rows[y].size()) {
if (y + 1 >= rows.size())
break;
++y;
x = 0;
continue;
}
break;
}
// Then, skip any non-word characters (including punctuation and whitespace)
while (y < rows.size()) {
if (x < rows[y].size()) {
unsigned char c = static_cast<unsigned char>(rows[y][x]);
if (is_word_char(c))
break;
++x;
continue;
}
if (x >= rows[y].size()) {
if (y + 1 >= rows.size())
break;
++y;
x = 0;
continue;
}
}
word_forward(rows, x, y);
// Now delete from (start_x, start_y) to (x, y) using PieceTable
std::string deleted = extract_region_text(*buf, start_x, start_y, x, y);
delete_region(*buf, start_x, start_y, x, y, buf->Undo());