[refactor] Moved "createProgressBarText" to its own TS file

utils/helpers/createProgressBarText.ts

@@ -0,0 +1,38 @@
+interface IProgressBarConfiguration {
+    /**
+     * Current progress, taken as a decimal (i.e. '0.6' to represent '60%')
+     */
+    progress?: number;
+
+    /**
+     * Total number of ticks in progress bar. Preferably a factor of 100.
+     */
+    totalTicks?: number;
+}
+
+interface IProgressBarConfigurationMaterialized extends IProgressBarConfiguration {
+    progress: number;
+    totalTicks: number;
+}
+
+/**
+ * Creates a graphical "progress bar"
+ * e.g.:  [||||---------------]
+ * @param params The configuration parameters for the progress bar
+ */
+export function createProgressBarText(params: IProgressBarConfiguration) {
+    // Default values
+    const defaultParams: IProgressBarConfigurationMaterialized = {
+        progress: 0,
+        totalTicks: 20,
+    };
+
+    // tslint:disable-next-line:prefer-object-spread
+    const derivedParams: IProgressBarConfigurationMaterialized = Object.assign({}, params, defaultParams);
+
+    const bars: number = Math.floor(derivedParams.progress / (1 / derivedParams.totalTicks));
+    const dashes: number = derivedParams.totalTicks - bars;
+
+    // String.prototype.repeat isn't completley supported, but good enough for our purposes
+    return `[${"|".repeat(bars + 1)}${"-".repeat(dashes + 1)}]`;
+}