feat: custom stripIndent

1 files changed, 34 insertions, 0 deletions

diff --git a/src/lib/common/tags.ts b/src/lib/common/tags.ts
new file mode 100644
index 0000000..098cf29
--- /dev/null
+++ b/src/lib/common/tags.ts
@@ -0,0 +1,34 @@
+/* these functions are adapted from the common-tags npm package which is licensed under the MIT license */
+/* the js docs are adapted from the @types/common-tags npm package which is licensed under the MIT license */
+
+/**
+ * Strips the **initial** indentation from the beginning of each line in a multiline string.
+ */
+export function stripIndent(strings: TemplateStringsArray, ...expressions: any[]) {
+	const str = format(strings, ...expressions);
+	// remove the shortest leading indentation from each line
+	const match = str.match(/^[^\S\n]*(?=\S)/gm);
+	const indent = match && Math.min(...match.map((el) => el.length));
+	if (indent) {
+		const regexp = new RegExp(`^.{${indent}}`, 'gm');
+		return str.replace(regexp, '');
+	}
+	return str;
+}
+
+/**
+ * Strips **all** of the indentation from the beginning of each line in a multiline string.
+ */
+export function stripIndents(strings: TemplateStringsArray, ...expressions: any[]) {
+	const str = format(strings, ...expressions);
+	// remove all indentation from each line
+	return str.replace(/^[^\S\n]+/gm, '');
+}
+
+function format(strings: TemplateStringsArray, ...expressions: any[]) {
+	const str = strings
+		.reduce((result, string, index) => ''.concat(result, expressions[index - 1], string))
+		.replace(/[^\S\n]+$/gm, '')
+		.replace(/^\n/, '');
+	return str;
+}