Improve performance of the .clear() method (#182)

Co-authored-by: moofoo <[email protected]>

index.js

@@ -142,6 +142,7 @@ class Ora {
 		}
 
 		this._indent = indent;
+		this.updateLineCount();
 	}
 
 	_updateInterval(interval) {
@@ -215,7 +216,7 @@ class Ora {
 		const columns = this.stream.columns || 80;
 		const fullPrefixText = this.getFullPrefixText(this.prefixText, '-');
 		this.lineCount = 0;
-		for (const line of stripAnsi(fullPrefixText + '--' + this[TEXT]).split('\n')) {
+		for (const line of stripAnsi(' '.repeat(this.indent) + fullPrefixText + '--' + this[TEXT]).split('\n')) {
 			this.lineCount += Math.max(1, Math.ceil(wcwidth(line) / columns));
 		}
 	}
@@ -264,15 +265,22 @@ class Ora {
 			return this;
 		}
 
+		this.stream.cursorTo(0);
+
 		for (let i = 0; i < this.linesToClear; i++) {
 			if (i > 0) {
 				this.stream.moveCursor(0, -1);
 			}
 
-			this.stream.clearLine();
+			this.stream.clearLine(1);
+		}
+
+		if (this.indent || this.lastIndent !== this.indent) {
 			this.stream.cursorTo(this.indent);
 		}
 
+		this.lastIndent = this.indent;
+
 		this.linesToClear = 0;
 
 		return this;

package.json

@@ -51,6 +51,7 @@
 		"@types/node": "^14.14.35",
 		"ava": "^2.4.0",
 		"get-stream": "^6.0.0",
+		"transform-tty": "^1.0.11",
 		"tsd": "^0.14.0",
 		"xo": "^0.38.2"
 	}