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node_modules/table/dist/alignString.js.flow

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+import _ from 'lodash';
+import stringWidth from 'string-width';
+
+const alignments = [
+  'left',
+  'right',
+  'center'
+];
+
+/**
+ * @param {string} subject
+ * @param {number} width
+ * @returns {string}
+ */
+const alignLeft = (subject, width) => {
+  return subject + ' '.repeat(width);
+};
+
+/**
+ * @param {string} subject
+ * @param {number} width
+ * @returns {string}
+ */
+const alignRight = (subject, width) => {
+  return ' '.repeat(width) + subject;
+};
+
+/**
+ * @param {string} subject
+ * @param {number} width
+ * @returns {string}
+ */
+const alignCenter = (subject, width) => {
+  let halfWidth;
+
+  halfWidth = width / 2;
+
+  if (halfWidth % 2 === 0) {
+    return ' '.repeat(halfWidth) + subject + ' '.repeat(halfWidth);
+  } else {
+    halfWidth = Math.floor(halfWidth);
+
+    return ' '.repeat(halfWidth) + subject + ' '.repeat(halfWidth + 1);
+  }
+};
+
+/**
+ * Pads a string to the left and/or right to position the subject
+ * text in a desired alignment within a container.
+ *
+ * @param {string} subject
+ * @param {number} containerWidth
+ * @param {string} alignment One of the valid options (left, right, center).
+ * @returns {string}
+ */
+export default (subject, containerWidth, alignment) => {
+  if (!_.isString(subject)) {
+    throw new TypeError('Subject parameter value must be a string.');
+  }
+
+  if (!_.isNumber(containerWidth)) {
+    throw new TypeError('Container width parameter value must be a number.');
+  }
+
+  const subjectWidth = stringWidth(subject);
+
+  if (subjectWidth > containerWidth) {
+    // console.log('subjectWidth', subjectWidth, 'containerWidth', containerWidth, 'subject', subject);
+
+    throw new Error('Subject parameter value width cannot be greater than the container width.');
+  }
+
+  if (!_.isString(alignment)) {
+    throw new TypeError('Alignment parameter value must be a string.');
+  }
+
+  if (!alignments.includes(alignment)) {
+    throw new Error('Alignment parameter value must be a known alignment parameter value (left, right, center).');
+  }
+
+  if (subjectWidth === 0) {
+    return ' '.repeat(containerWidth);
+  }
+
+  const availableWidth = containerWidth - subjectWidth;
+
+  if (alignment === 'left') {
+    return alignLeft(subject, availableWidth);
+  }
+
+  if (alignment === 'right') {
+    return alignRight(subject, availableWidth);
+  }
+
+  return alignCenter(subject, availableWidth);
+};