Add several EMS file formats.

src/main/decoder/decode-ttl.ts

@@ -0,0 +1,52 @@
+import { DBFFile } from "dbffile";
+import log from "electron-log/main";
+import _ from "lodash";
+import deepLowerCaseKeys from "../../util/deepLowercaseKeys";
+import errorTypeCheck from "../../util/errorTypeCheck";
+import { DecodedTtl, DecodedTtlLine } from "./decode-ttl.interface";
+
+const DecodeTtl = async (
+  extensionlessFilePath: string
+): Promise<DecodedTtl> => {
+  let dbf: DBFFile | null = null;
+  try {
+    dbf = await DBFFile.open(`${extensionlessFilePath}.TTL`);
+  } catch (error) {
+    log.error("Error opening TTL File.", errorTypeCheck(error));
+  }
+
+  if (!dbf) {
+    log.error(`Could not find any TTL files at ${extensionlessFilePath}`);
+    throw new Error(`Could not find any TTL files at ${extensionlessFilePath}`);
+  }
+
+  const rawDBFRecord = await dbf.readRecords(1);
+
+  //PFT will always have only 1 row.
+  //Commented lines have been cross referenced with existing partner fields.
+
+  const rawTtlData: DecodedTtlLine = deepLowerCaseKeys(
+    _.pick(rawDBFRecord[0], [
+      //TODO: Add typings for EMS File Formats.
+      "G_TTL_AMT",
+      "G_BETT_AMT",
+      "G_RPD_AMT",
+      "G_DED_AMT",
+      "G_CUST_AMT",
+      "G_AA_AMT",
+      "N_TTL_AMT",
+      "PREV_NET",
+      "SUPP_AMT",
+      "N_SUPP_AMT", //Previously commented. Possible issue.
+      "G_UPD_AMT",
+      "G_TTL_DISC",
+      "G_TAX",
+      "GST_AMT",
+    ])
+  );
+
+  //Apply business logic transfomrations.
+
+  return { clm_total: 0, depreciation_taxes: 0, cieca_ttl: rawTtlData };
+};
+export default DecodeTtl;