${imageSection}
@@ -573,6 +623,170 @@ function formatBlock(tag) {
// Make it globally available
window.formatBlock = formatBlock;
+// ==========================================
+// CASE CHANGE FUNCTIONS
+// ==========================================
+
+/**
+ * Change the case of selected text
+ * @param {string} caseType - Type of case: 'sentence', 'lower', 'upper', 'capitalized', 'title'
+ */
+function changeCase(caseType) {
+ const selection = window.getSelection();
+
+ // Check if there's a valid selection with actual content
+ if (!selection || selection.isCollapsed || selection.toString().trim().length === 0) {
+ alert('Please select some text first to change its case.');
+ return;
+ }
+
+ const selectedText = selection.toString();
+ let transformedText = '';
+
+ switch (caseType) {
+ case 'sentence':
+ transformedText = toSentenceCase(selectedText);
+ break;
+ case 'lower':
+ transformedText = selectedText.toLowerCase();
+ break;
+ case 'upper':
+ transformedText = selectedText.toUpperCase();
+ break;
+ case 'capitalized':
+ transformedText = toCapitalizedCase(selectedText);
+ break;
+ case 'title':
+ transformedText = toTitleCase(selectedText);
+ break;
+ default:
+ transformedText = selectedText;
+ }
+
+ // Replace the selected text with transformed text
+ replaceSelectedText(selection, transformedText);
+}
+
+// Make it globally available
+window.changeCase = changeCase;
+
+/**
+ * Convert text to Sentence case
+ * First letter of each sentence is capitalized, rest is lowercase
+ * @param {string} text - Input text
+ * @returns {string} Transformed text
+ */
+function toSentenceCase(text) {
+ // First convert everything to lowercase
+ let result = text.toLowerCase();
+
+ // Capitalize the first letter
+ result = result.charAt(0).toUpperCase() + result.slice(1);
+
+ // Capitalize letter after sentence-ending punctuation (. ! ?)
+ result = result.replace(/([.!?]\s*)([a-z])/g, (match, punctuation, letter) => {
+ return punctuation + letter.toUpperCase();
+ });
+
+ // Also handle newlines as sentence breaks
+ result = result.replace(/(\n\s*)([a-z])/g, (match, newline, letter) => {
+ return newline + letter.toUpperCase();
+ });
+
+ return result;
+}
+
+/**
+ * Convert text to Capitalized Case
+ * First letter of every word is capitalized
+ * @param {string} text - Input text
+ * @returns {string} Transformed text
+ */
+function toCapitalizedCase(text) {
+ return text.toLowerCase().replace(/\b\w/g, (letter) => letter.toUpperCase());
+}
+
+/**
+ * Convert text to Title Case
+ * Like Capitalized Case but keeps small words (articles, prepositions, conjunctions) lowercase
+ * unless they're the first or last word
+ * @param {string} text - Input text
+ * @returns {string} Transformed text
+ */
+function toTitleCase(text) {
+ // Words that should remain lowercase (unless first or last)
+ const smallWords = [
+ 'a', 'an', 'and', 'as', 'at', 'but', 'by', 'for', 'in', 'nor',
+ 'of', 'on', 'or', 'so', 'the', 'to', 'up', 'yet', 'is', 'be',
+ 'with', 'from', 'into', 'over', 'after', 'under', 'above'
+ ];
+
+ const words = text.toLowerCase().split(/(\s+)/); // Split but keep whitespace
+
+ let isFirstWord = true;
+ let result = [];
+
+ for (let i = 0; i < words.length; i++) {
+ const word = words[i];
+
+ // If it's whitespace, just add it
+ if (/^\s+$/.test(word)) {
+ result.push(word);
+ continue;
+ }
+
+ // Check if this is the last actual word
+ let isLastWord = true;
+ for (let j = i + 1; j < words.length; j++) {
+ if (!/^\s+$/.test(words[j])) {
+ isLastWord = false;
+ break;
+ }
+ }
+
+ // Capitalize if it's first word, last word, or not a small word
+ if (isFirstWord || isLastWord || !smallWords.includes(word.toLowerCase())) {
+ result.push(word.charAt(0).toUpperCase() + word.slice(1));
+ } else {
+ result.push(word);
+ }
+
+ isFirstWord = false;
+ }
+
+ return result.join('');
+}
+
+/**
+ * Replace selected text with new text while preserving cursor position
+ * @param {Selection} selection - Current selection
+ * @param {string} newText - Text to insert
+ */
+function replaceSelectedText(selection, newText) {
+ if (!selection.rangeCount) return;
+
+ const range = selection.getRangeAt(0);
+
+ // Delete the selected content
+ range.deleteContents();
+
+ // Create a text node with the new text
+ const textNode = document.createTextNode(newText);
+
+ // Insert the new text
+ range.insertNode(textNode);
+
+ // Move cursor to end of inserted text
+ range.setStartAfter(textNode);
+ range.setEndAfter(textNode);
+ selection.removeAllRanges();
+ selection.addRange(range);
+}
+
+// ==========================================
+// NORMALIZE FUNCTIONS
+// ==========================================
+
/**
* Normalize section text (clean up formatting)
* If text is selected, only normalize the selection