basic csv support

+ csv imports
+ import options
+ type detection
+ bool, number, date, text, email and json types supported

utils/csv.ts

@@ -0,0 +1,44 @@
+import { readCSVObjects } from "https://deno.land/x/csv@v0.8.0/reader.ts";
+import { ParserOptions, RawRow } from "../types/csv.ts";
+
+/**
+ * Parse a file to string-based object array.
+ * @param filename - Name of the .csv file (with extension)
+ * @param csvOptions - Options for the parser
+ * @returns
+ */
+export async function parseCsv(
+  filename: string | null,
+  csvOptions: ParserOptions,
+): Promise<RawRow[] | null> {
+  const results: RawRow[] = [];
+
+  try {
+    const f = await Deno.open(`./input/${filename}`);
+
+    for await (const obj of readCSVObjects(f, csvOptions)) {
+      results.push(obj);
+    }
+
+    f.close();
+  } catch (e) {
+    console.error(`%c${e}`, "color: red");
+    return null;
+  }
+
+  // No columns
+  if (results.length === 0) {
+    return null;
+  }
+
+  return results;
+}
+
+/**
+ * Parses a boolean with truthy values being `'true'` and `'1'`.
+ * @param value Raw string value
+ * @returns
+ */
+export function parseBool(value: string): boolean {
+  return ["true", "1"].includes(value);
+}