docs: stuff

src/cli/ui/ui.ts

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+import blessed from 'blessed';
+import chalk from 'chalk';
+
+class UI {
+  #box: blessed.Widgets.BoxElement;
+  #screen: blessed.Widgets.Screen;
+
+  constructor() {
+    const screen = blessed.screen({
+      smartCSR: true,
+      title: 'Markdown Viewer'
+    });
+    const scrollableBox = blessed.box({ // Or blessed.scrollablebox
+      parent: screen,
+      top: 0,
+      left: 0,
+      width: '100%',
+      height: '100%',
+      content: '',
+      scrollable: true,
+      alwaysScroll: true,
+      keys: true,
+      vi: true, // vi-like keybindings
+      mouse: true,
+      scrollbar: {
+        ch: ' ',
+        track: {
+          bg: 'cyan'
+        },
+        style: {
+          inverse: true
+        }
+      },
+      style: {
+        fg: 'white',
+        bg: 'black'
+      }
+    });
+    this.#box = scrollableBox;
+    this.#screen = screen;
+
+    screen.key(['escape', 'q', 'C-c'], () => {
+      return process.exit(0);
+    });
+
+    scrollableBox.focus();
+    screen.render();
+  }
+
+  public get screen() {
+    return this.#screen;
+  }
+
+  public set content(content: string) {
+    const originalLines = content.split('\n');
+    const maxLineNoDigits = String(originalLines.length).length; // For padding
+
+    const linesWithNumbers = originalLines.map((line, index) => {
+      const lineNumber = String(index + 1).padStart(maxLineNoDigits, ' ');
+      const styledLineNumber = chalk.dim.yellow(`${lineNumber} | `);
+      return `${styledLineNumber}${line}`;
+    });
+
+    const contentWithLineNumbers = linesWithNumbers.join('\n');
+    this.#box.setContent(contentWithLineNumbers);
+    this.#screen.render();
+  }
+}
+
+export { UI };