Improve title case

src/main.ts

@@ -1,5 +1,5 @@
 import { Editor, Plugin } from "obsidian";
-import { toTitleCase } from "./text";
+import { convertToTitleCase } from "./text";
 import { TextTransformSettingsTab } from "./settings";
 
 interface TextTransformSettings {
@@ -46,7 +46,13 @@ export default class TextTransform extends Plugin {
         this.addCommand({
             id: "title-case",
             name: "Transform to Title Case",
-            editorCallback: (editor) => toTitleCase(editor, this),
+            editorCallback: (editor) => {
+                if (editor.hasFocus()) {
+                    let selection = editor.getSelection();
+                    selection = convertToTitleCase(selection, this.settings.wordBoundaryChars, this.settings.titleCaseIgnore);
+                    this.replaceSelection(editor, selection);
+                }
+            },
         });
 
         console.log("Text Transform plugin loaded");

src/text.ts

@@ -1,47 +1,37 @@
-import { Editor } from "obsidian";
-import TextTransform from "./main";
+export function convertToTitleCase(text: string, wordBoundaryChars: string[], ignore: string[]): string {
+    // Add space and tab to wordBoundaryChars
+    wordBoundaryChars.push(" ", "\t");
 
-export function toTitleCase(editor: Editor, plugin: TextTransform) {
-    // Get the selected text
-    const from = editor.getCursor("from");
-    const to = editor.getCursor("to");
-    const selection = editor.getSelection();
-
-    // First put the string into lower case
-    let transformed = selection.toLowerCase();
-    // Replace all chars in wordBoundaryChars with spaces
-    for (const char of plugin.settings.wordBoundaryChars) {
-        transformed = transformed.replace(char, " ");
-    }
-    // Split using space as separator
-    const words = transformed.split(" ");
-    // Transform words
-    transformed = "";
-    for (const word of words) {
-        // Check for ignored words
-        if (plugin.settings.titleCaseIgnore.includes(word)) {
-            transformed += word + " ";
-            continue;
-        }
-        // Transform first character
-        if (word.length > 0) {
-            transformed += word[0].toUpperCase();
-        }
-        // Add in remaining characters
-        if (word.length > 1) {
-            transformed += word.slice(1);
-        }
-        // Add separator (space)
-        transformed += " ";
-    }
-    // Replace spaces with original characters
-    for (const [i, char] of [...selection].entries()) {
-        if (plugin.settings.wordBoundaryChars.includes(char)) {
-            transformed = transformed.slice(0, i) + char + transformed.slice(i + 1);
+    let transformed = "";
+    let word = "";
+    // Iterate the characters and build each word
+    for (const char of text) {
+        if (wordBoundaryChars.includes(char)) {
+            // push 'word' to 'transformed'
+            transformed += convertWord(word, ignore);
+            // push 'char' to 'transformed'
+            transformed += char;
+            // clear 'word'
+            word = "";
+        } else {
+            // push 'char' to 'word'
+            word += char;
         }
     }
+    // Push 'word' one last time
+    transformed += convertWord(word, ignore);
 
-    // Replace the selection and re-highlight
-    editor.replaceSelection(transformed.trim());
-    editor.setSelection(from, to);
+    return transformed;
+}
+
+function convertWord(word: string, ignore: string[]): string {
+    if (word.length > 0) {
+        // convert to lowercase
+        word = word.toLocaleLowerCase();
+        // only capitalize if not in 'ignore' list
+        if (!ignore.includes(word)) {
+            word = word[0].toLocaleUpperCase() + word.slice(1);
+        }
+    }
+    return word;
 }