diff --git a/editmode.ts b/editmode.ts
index aa377bd..904fb1a 100644
--- a/editmode.ts
+++ b/editmode.ts
@@ -46,9 +46,33 @@ const codeTabState = {
 		this.code = code.slice(0, Math.min(anchor, focus)) + text + code.slice(Math.max(anchor, focus));
 		this.setSelection(Math.min(anchor, focus) + text.length);
 	},
-	// indent(char) {
-	// 	const lines = this.code.split("\n").
-	// },
+	indent(indentString: string) {
+		const lines = this.code.split("\n");
+		const {focusY, anchorY} = this;
+		const newLines = lines.map((line, i) => {
+			console.log(i, Math.min(focusY, anchorY), Math.max(focusY, anchorY));
+			if (i >= Math.min(focusY, anchorY) && i <= Math.max(focusY, anchorY)) {
+				console.log(indentString+line);
+				return indentString+line;
+			} else {
+				return line;
+			}
+		});
+		this.code = newLines.join("\n");
+	},
+	outdent(outdentRegex: RegExp) {
+		const lines = this.code.split("\n");
+		const {focusY, anchorY} = this;
+		const newLines = lines.map((line, i) => {
+			const match = line.match(outdentRegex);
+			if (i >= Math.min(focusY, anchorY) && i <= Math.max(focusY, anchorY) && match) {
+				return line.slice(match[0].length);
+			} else {
+				return line;
+			}
+		});
+		this.code = newLines.join("\n");
+	},
 	backspace() {
 		const {code, focus} = this;
 		if (this.isCollapsed()) {
@@ -127,12 +151,12 @@ const update = () => {
 		if (keyPressed(K.TAB)) {
 			if (!shiftKeyDown()) {
 				if (codeTabState.isCollapsed()) {
-					codeTabState.insertText("\n");
+					codeTabState.insertText("\t");
 				} else {
-					// codeTabState.indent("\t");
+					codeTabState.indent("\t");
 				}
 			} else {
-				// codeTabState.outdent(/\t| /);
+				codeTabState.outdent(/^(\t| )/);
 			}
 		}
 		if (keyPressed(K.BACKSPACE)) {