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<?php /* * This file is part of Psy Shell. * * (c) 2012-2026 Justin Hileman * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. / namespace Psy\Readline\Interactive; use Psy\Output\Theme; use Psy\Readline\Interactive\Helper\HistorySearchRenderer; use Psy\Readline\Interactive\Input\Buffer; use Psy\Readline\Interactive\Input\History; use Psy\Readline\Interactive\Input\Key; use Psy\Readline\Interactive\Input\WordNavigationPolicy; use Psy\Readline\Interactive\Renderer\FrameRenderer; use Psy\Readline\Interactive\Renderer\OverlayViewport; /* * History search state machine for interactive readline. * * Manages the search query, match list, selection, viewport scrolling, * and rendering for reverse history search (Ctrl-R). / class HistorySearch { private Terminal $terminal; private History $history; private FrameRenderer $frameRenderer; private OverlayViewport $overlayViewport; private Theme $theme; private bool $active = false; private string $searchQuery = ''; /* @var string[] / private array $searchMatches = []; private int $currentMatchIndex = -1; private int $searchScrollOffset = 0; private bool $searchExpanded = false; private ?string $savedBufferText = null; private int $savedCursorPosition = 0; private ?HistorySearchRenderer $renderer = null; public function __construct( Terminal $terminal, History $history, FrameRenderer $frameRenderer, OverlayViewport $overlayViewport, Theme $theme ) { $this->terminal = $terminal; $this->history = $history; $this->frameRenderer = $frameRenderer; $this->overlayViewport = $overlayViewport; $this->theme = $theme; } /* * Set the theme. / public function setTheme(Theme $theme): void { $this->theme = $theme; $this->renderer = null; } /* * Check if search mode is active. / public function isActive(): bool { return $this->active; } /* * Enter search mode with an optional initial query. / public function enter(string $query = ''): void { $this->active = true; $this->updateQuery($query); } /* * Exit search mode and clear state. / public function exit(): void { $this->active = false; $this->resetState(); $this->savedBufferText = null; $this->savedCursorPosition = 0; $this->frameRenderer->setOverlayLines([]); } /* * Save the current buffer before starting search. / public function saveBuffer(Buffer $buffer): void { $this->savedBufferText = $buffer->getText(); $this->savedCursorPosition = $buffer->getCursor(); } /* * Handle input while in search mode. * * @return bool\|null True to stay in search, false if exited (key consumed), null if exited (replay key) / public function handleInput(Key $key, Buffer $buffer) { $value = $key->getValue(); $keyStr = (string) $key; if ($value === "\x07" \|\| $value === "\x1b") { // Ctrl-G or Escape $this->cancelSearch($buffer); return false; } elseif ($value === "\r" \|\| $value === "\n") { $this->acceptMatch($buffer); return false; } elseif ($keyStr === 'escape:[C' \|\| $value === "\x06") { // Right or Ctrl-F: accept, cursor at end $this->acceptMatch($buffer); return false; } elseif ($keyStr === 'escape:[D' \|\| $value === "\x02") { // Left or Ctrl-B: accept, cursor at start $this->acceptMatch($buffer); $buffer->setCursor(0); return false; } elseif ($keyStr === 'escape:[A' \|\| $value === "\x10" \|\| $value === "\x13") { // Up, Ctrl-P, or Ctrl-S $this->moveSelection(-1); return true; } elseif ($keyStr === 'escape:[B' \|\| $value === "\x0e" \|\| $value === "\x12") { // Down, Ctrl-N, or Ctrl-R $this->moveSelection(1); return true; } elseif ($value === "\x17") { // Ctrl-W: delete last word $this->removeWord(); return true; } elseif ($value === "\x08" \|\| $value === "\x7f") { // Backspace $this->removeChar(); return true; } elseif ($key->isChar() && !$key->isControl()) { $this->addChar($value); return true; } else { $this->acceptMatch($buffer); return null; } } /* * Render the search UI with overlay. / public function display(): void { $preview = $this->getSelectedMatch() ?? ''; $searchPrompt = $this->terminal->format('<whisper>search:</whisper>').' '.$this->searchQuery; $this->updateOverlay(); $this->frameRenderer->renderSearchFrame($preview, $searchPrompt); } /* * Get the search query. / public function getQuery(): string { return $this->searchQuery; } /* * Get the number of search matches. / public function getMatchCount(): int { return \count($this->searchMatches); } /* * Get the search selection index. / public function getSelectedIndex(): int { return $this->currentMatchIndex; } /* * Get the current search match. * * @return string\|null The current match, or null if no match / public function getSelectedMatch(): ?string { if (empty($this->searchMatches) \|\| $this->currentMatchIndex < 0) { return null; } return $this->searchMatches[$this->currentMatchIndex] ?? null; } /* * Find next match in search results (older entries). / public function findNext(): void { $this->moveSelection(1); } /* * Find previous match in search results (newer entries). / public function findPrevious(): void { $this->moveSelection(-1); } /* * Update search query and find matches. / public function updateQuery(string $query): void { $this->searchQuery = $query; $this->searchMatches = $this->history->search($query); $this->currentMatchIndex = empty($this->searchMatches) ? -1 : 0; $this->searchScrollOffset = 0; $this->searchExpanded = false; } /* * Add a character to the search query. / private function addChar(string $char): void { $this->updateQuery($this->searchQuery.$char); } /* * Remove last character from search query. / private function removeChar(): void { if ($this->searchQuery !== '') { $this->updateQuery(\mb_substr($this->searchQuery, 0, -1)); } } /* * Remove last word from search query. / private function removeWord(): void { if ($this->searchQuery === '') { return; } $policy = new WordNavigationPolicy(); $boundary = $policy->findPreviousWord($this->searchQuery, \mb_strlen($this->searchQuery)); $this->updateQuery(\mb_substr($this->searchQuery, 0, $boundary)); } /* * Reset search query and match state. / private function resetState(): void { $this->searchQuery = ''; $this->searchMatches = []; $this->currentMatchIndex = -1; $this->searchScrollOffset = 0; $this->searchExpanded = false; } /* * Move search selection up or down, adjusting viewport as needed. / private function moveSelection(int $delta): void { $count = \count($this->searchMatches); if ($count === 0) { $this->terminal->bell(); return; } $newIndex = $this->currentMatchIndex + $delta; if ($newIndex < 0) { $newIndex = $count - 1; $this->terminal->bell(); } elseif ($newIndex >= $count) { $newIndex = 0; $this->terminal->bell(); } $this->currentMatchIndex = $newIndex; $this->adjustViewport(); } /* * Accept current search match and exit search mode. / private function acceptMatch(Buffer $buffer): void { $match = $this->getSelectedMatch(); if ($match !== null) { $buffer->clear(); $buffer->insert($match); } $this->exit(); } /* * Cancel search and restore original buffer. / private function cancelSearch(Buffer $buffer): void { if ($this->savedBufferText !== null) { $buffer->clear(); $buffer->insert($this->savedBufferText); $buffer->setCursor($this->savedCursorPosition); } $this->exit(); } /* * Build and set overlay lines for the current search results. / private function updateOverlay(): void { if (empty($this->searchMatches)) { if ($this->searchQuery !== '') { $noMatch = $this->terminal->format(' <whisper>(no matches)</whisper>'); $this->frameRenderer->setOverlayLines([$noMatch]); } else { $this->frameRenderer->setOverlayLines([]); } return; } if ($this->renderer === null) { $this->renderer = new HistorySearchRenderer($this->terminal, $this->theme->replayPrompt()); } $this->renderer->setQuery($this->searchQuery); $maxRows = $this->getMaxRows(); $lines = $this->renderer->render( $this->searchMatches, $this->currentMatchIndex, $maxRows, $this->searchScrollOffset, \count($this->searchMatches), ); $this->frameRenderer->setOverlayLines($lines); } /* * Get the maximum visible rows for search results. * * Returns null if all rows fit without truncation. / private function getMaxRows(): ?int { $available = $this->overlayViewport->getAvailableRows(!$this->searchExpanded); // OverlayViewport already accounts for input frame + search prompt rows. $menuBudget = \max(1, $available); $totalRows = \count($this->searchMatches); if ($totalRows <= $menuBudget) { return null; } // Reserve one row for the status line return \max(1, $menuBudget - 1); } /* * Adjust search scroll offset so the selected item is visible. */ private function adjustViewport(): void { $maxRows = $this->getMaxRows(); if ($maxRows === null) { $this->searchScrollOffset = 0; return; } $selected = $this->currentMatchIndex; // Scrolled past the top: snap to selection if ($selected < $this->searchScrollOffset) { $this->searchScrollOffset = $selected; } // Scrolled past the bottom: try expanding the viewport first if ($selected >= $this->searchScrollOffset + $maxRows && !$this->searchExpanded) { $this->searchExpanded = true; $maxRows = $this->getMaxRows(); if ($maxRows === null) { $this->searchScrollOffset = 0; return; } } // Still past the bottom after expanding: scroll down if ($selected >= $this->searchScrollOffset + $maxRows) { $this->searchScrollOffset = $selected - $maxRows + 1; } $count = \count($this->searchMatches); $this->searchScrollOffset = \max(0, \min($this->searchScrollOffset, $count - $maxRows)); } }

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