Added optional case sensitive searching

demo/client.ts

@@ -103,7 +103,7 @@ function createTerminal(): void {
       const searchOptions = {
         regex: (document.getElementById('regex') as HTMLInputElement).checked,
         wholeWord: false,
-        caseSensitive: false
+        caseSensitive: (document.getElementById('case-sensitive') as HTMLInputElement).checked
       };
       term.findNext(actionElements.findNext.value, searchOptions);
     }
@@ -114,7 +114,7 @@ function createTerminal(): void {
       const searchOptions = {
         regex: (document.getElementById('regex') as HTMLInputElement).checked,
         wholeWord: false,
-        caseSensitive: false
+        caseSensitive: (document.getElementById('case-sensitive') as HTMLInputElement).checked
       };
       term.findPrevious(actionElements.findPrevious.value, searchOptions);
     }

demo/index.html

@@ -17,6 +17,7 @@
         <label>Find next <input id="find-next"/></label>
         <label>Find previous <input id="find-previous"/></label>
         <label>Use regex<input type="checkbox" id="regex"/></label> 
+        <label>Case sensitive<input type="checkbox" id="case-sensitive"/></label>
       </p>
     </div>
     <div>

src/addons/search/SearchHelper.ts

@@ -113,18 +113,21 @@ export class SearchHelper implements ISearchHelper {
     if (this._terminal._core.buffer.lines.get(y).isWrapped) {
       return;
     }
-    const lowerStringLine = this.translateBufferLineToStringWithWrap(y, true).toLowerCase();
-    const lowerTerm = term.toLowerCase();
-    let searchIndex = -1;
+
+    const stringLIne = this.translateBufferLineToStringWithWrap(y, true);
+    const searchStringLine = searchOptions.caseSensitive ? stringLIne : stringLIne.toLowerCase();
+    const searchTerm = searchOptions.caseSensitive ? term : term.toLowerCase();
+    let searchIndex = searchStringLine.indexOf(searchTerm);
+
     if (searchOptions.regex) {
-      const searchRegex = RegExp(lowerTerm, 'g');
-      const foundTerm = searchRegex.exec(lowerStringLine);
+      const searchRegex = RegExp(searchTerm, 'g');
+      const foundTerm = searchRegex.exec(searchStringLine);
       if (foundTerm && foundTerm[0].length > 0) {
         searchIndex = searchRegex.lastIndex - foundTerm[0].length;
         term = foundTerm[0];
       }
     } else {
-      searchIndex = lowerStringLine.indexOf(lowerTerm);
+      searchIndex = searchStringLine.indexOf(searchTerm);
     }
 
     if (searchIndex >= 0) {

src/addons/search/search.test.ts

@@ -117,5 +117,17 @@ describe('search addon', () => {
       const line = term.searchHelper.findInLine('^.*$', 0, { regex: true });
       expect(line).eql(undefined);
     });
+    it('should respect case sensitive', function(): void {
+      search.apply(<any>MockTerminal);
+      const term = new MockTerminal({cols: 20, rows: 4});
+      term.core.write('Hello World\r\n123....hello\r\nmoreTestHello');
+      term.pushWriteData();
+      const hello0 = (term.searchHelper as any)._findInLine('Hello', 0, true);
+      const hello1 = (term.searchHelper as any)._findInLine('Hello', 1, true);
+      const hello2 = (term.searchHelper as any)._findInLine('Hello', 2, true);
+      expect(hello0).eql({col: 0, row: 0, term: 'Hello'});
+      expect(hello1).eql(undefined);
+      expect(hello2).eql({col: 8, row: 2, term: 'Hello'});
+    });
   });
 });