Make adjusted scroll value available in prompt constructor

src/Concerns/ReducesScrollingToFitTerminal.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Laravel\Prompts\Concerns;
+
+use Laravel\Prompts\Themes\Contracts\Scrolling;
+
+trait ReducesScrollingToFitTerminal
+{
+    /**
+     * Reduce the scroll property to fit the terminal height.
+     */
+    protected function reduceScrollingToFitTerminal(): void
+    {
+        $reservedLines = ($renderer = $this->getRenderer()) instanceof Scrolling ? $renderer->reservedLines() : 0;
+
+        $this->scroll = min($this->scroll, $this->terminal()->lines() - $reservedLines);
+    }
+}

src/MultiSelectPrompt.php

@@ -7,6 +7,8 @@
 
 class MultiSelectPrompt extends Prompt
 {
+    use Concerns\ReducesScrollingToFitTerminal;
+
     /**
      * The index of the highlighted option.
      */
@@ -57,6 +59,8 @@ public function __construct(
         $this->default = $default instanceof Collection ? $default->all() : $default;
         $this->values = $this->default;
 
+        $this->reduceScrollingToFitTerminal();
+
         $this->on('key', fn ($key) => match ($key) {
             Key::UP, Key::UP_ARROW, Key::LEFT, Key::LEFT_ARROW, Key::SHIFT_TAB, 'k', 'h' => $this->highlightPrevious(),
             Key::DOWN, Key::DOWN_ARROW, Key::RIGHT, Key::RIGHT_ARROW, Key::TAB, 'j', 'l' => $this->highlightNext(),

src/SearchPrompt.php

@@ -6,6 +6,7 @@
 
 class SearchPrompt extends Prompt
 {
+    use Concerns\ReducesScrollingToFitTerminal;
     use Concerns\Truncation;
     use Concerns\TypedValue;
 
@@ -41,6 +42,8 @@ public function __construct(
     ) {
         $this->trackTypedValue(submit: false);
 
+        $this->reduceScrollingToFitTerminal();
+
         $this->on('key', fn ($key) => match ($key) {
             Key::UP, Key::UP_ARROW, Key::SHIFT_TAB => $this->highlightPrevious(),
             Key::DOWN, Key::DOWN_ARROW, Key::TAB => $this->highlightNext(),

src/SelectPrompt.php

@@ -7,6 +7,8 @@
 
 class SelectPrompt extends Prompt
 {
+    use Concerns\ReducesScrollingToFitTerminal;
+
     /**
      * The index of the highlighted option.
      */
@@ -39,6 +41,8 @@ public function __construct(
     ) {
         $this->options = $options instanceof Collection ? $options->all() : $options;
 
+        $this->reduceScrollingToFitTerminal();
+
         if ($this->default) {
             if (array_is_list($this->options)) {
                 $this->highlighted = array_search($this->default, $this->options) ?: 0;

src/SuggestPrompt.php

@@ -7,6 +7,7 @@
 
 class SuggestPrompt extends Prompt
 {
+    use Concerns\ReducesScrollingToFitTerminal;
     use Concerns\Truncation;
     use Concerns\TypedValue;
 
@@ -51,6 +52,8 @@ public function __construct(
     ) {
         $this->options = $options instanceof Collection ? $options->all() : $options;
 
+        $this->reduceScrollingToFitTerminal();
+
         $this->on('key', fn ($key) => match ($key) {
             Key::UP, Key::UP_ARROW, Key::SHIFT_TAB => $this->highlightPrevious(),
             Key::DOWN, Key::DOWN_ARROW, Key::TAB => $this->highlightNext(),

src/Themes/Contracts/Scrolling.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace Laravel\Prompts\Themes\Contracts;
+
+interface Scrolling
+{
+    /**
+     * The number of lines to reserve outside of the scrollable area.
+     */
+    public function reservedLines(): int;
+}

src/Themes/Default/MultiSelectPromptRenderer.php

@@ -3,8 +3,9 @@
 namespace Laravel\Prompts\Themes\Default;
 
 use Laravel\Prompts\MultiSelectPrompt;
+use Laravel\Prompts\Themes\Contracts\Scrolling;
 
-class MultiSelectPromptRenderer extends Renderer
+class MultiSelectPromptRenderer extends Renderer implements Scrolling
 {
     use Concerns\DrawsBoxes;
     use Concerns\DrawsScrollbars;
@@ -14,8 +15,6 @@ class MultiSelectPromptRenderer extends Renderer
      */
     public function __invoke(MultiSelectPrompt $prompt): string
     {
-        $prompt->scroll = min($prompt->scroll, $prompt->terminal()->lines() - 5);
-
         return match ($prompt->state) {
             'submit' => $this
                 ->box(
@@ -109,4 +108,12 @@ protected function renderSelectedOptions(MultiSelectPrompt $prompt): string
             $prompt->labels()
         ));
     }
+
+    /**
+     * The number of lines to reserve outside of the scrollable area.
+     */
+    public function reservedLines(): int
+    {
+        return 5;
+    }
 }

src/Themes/Default/Renderer.php

@@ -9,8 +9,8 @@
 
 abstract class Renderer
 {
-    use Truncation;
     use Colors;
+    use Truncation;
 
     /**
      * The output to be rendered.

src/Themes/Default/SearchPromptRenderer.php

@@ -3,8 +3,9 @@
 namespace Laravel\Prompts\Themes\Default;
 
 use Laravel\Prompts\SearchPrompt;
+use Laravel\Prompts\Themes\Contracts\Scrolling;
 
-class SearchPromptRenderer extends Renderer
+class SearchPromptRenderer extends Renderer implements Scrolling
 {
     use Concerns\DrawsBoxes;
     use Concerns\DrawsScrollbars;
@@ -14,7 +15,6 @@ class SearchPromptRenderer extends Renderer
      */
     public function __invoke(SearchPrompt $prompt): string
     {
-        $prompt->scroll = min($prompt->scroll, $prompt->terminal()->lines() - 7);
         $maxWidth = $prompt->terminal()->cols() - 6;
 
         return match ($prompt->state) {
@@ -123,4 +123,12 @@ protected function renderOptions(SearchPrompt $prompt): string
             min($this->longest($prompt->matches(), padding: 4), $prompt->terminal()->cols() - 6)
         )->implode(PHP_EOL);
     }
+
+    /**
+     * The number of lines to reserve outside of the scrollable area.
+     */
+    public function reservedLines(): int
+    {
+        return 7;
+    }
 }

src/Themes/Default/SelectPromptRenderer.php

@@ -3,8 +3,9 @@
 namespace Laravel\Prompts\Themes\Default;
 
 use Laravel\Prompts\SelectPrompt;
+use Laravel\Prompts\Themes\Contracts\Scrolling;
 
-class SelectPromptRenderer extends Renderer
+class SelectPromptRenderer extends Renderer implements Scrolling
 {
     use Concerns\DrawsBoxes;
     use Concerns\DrawsScrollbars;
@@ -14,7 +15,6 @@ class SelectPromptRenderer extends Renderer
      */
     public function __invoke(SelectPrompt $prompt): string
     {
-        $prompt->scroll = min($prompt->scroll, $prompt->terminal()->lines() - 5);
         $maxWidth = $prompt->terminal()->cols() - 6;
 
         return match ($prompt->state) {
@@ -83,4 +83,12 @@ protected function renderOptions(SelectPrompt $prompt): string
             $prompt->state === 'cancel' ? 'dim' : 'cyan'
         )->implode(PHP_EOL);
     }
+
+    /**
+     * The number of lines to reserve outside of the scrollable area.
+     */
+    public function reservedLines(): int
+    {
+        return 5;
+    }
 }

src/Themes/Default/SuggestPromptRenderer.php

@@ -3,8 +3,9 @@
 namespace Laravel\Prompts\Themes\Default;
 
 use Laravel\Prompts\SuggestPrompt;
+use Laravel\Prompts\Themes\Contracts\Scrolling;
 
-class SuggestPromptRenderer extends Renderer
+class SuggestPromptRenderer extends Renderer implements Scrolling
 {
     use Concerns\DrawsBoxes;
     use Concerns\DrawsScrollbars;
@@ -14,7 +15,6 @@ class SuggestPromptRenderer extends Renderer
      */
     public function __invoke(SuggestPrompt $prompt): string
     {
-        $prompt->scroll = min($prompt->scroll, $prompt->terminal()->lines() - 7);
         $maxWidth = $prompt->terminal()->cols() - 6;
 
         return match ($prompt->state) {
@@ -111,4 +111,12 @@ protected function renderOptions(SuggestPrompt $prompt): string
             $prompt->state === 'cancel' ? 'dim' : 'cyan'
         )->implode(PHP_EOL);
     }
+
+    /**
+     * The number of lines to reserve outside of the scrollable area.
+     */
+    public function reservedLines(): int
+    {
+        return 7;
+    }
 }