fix(Nordigen): bring back file override

This commit brings back the ability to override the requisition file
used by Nordigen. Allowing the user to have multiple req. files inside
the same data directory.

Fixes #69

.gitignore

@@ -1,4 +1,5 @@
 .vscode
+.cache
 *.csv
 *.env
 *.json

config.go

@@ -87,6 +87,10 @@ type Nordigen struct {
 	// requisition process. The hook is executed with the following arguments:
 	// <status> <link>
 	RequisitionHook string `envconfig:"NORDIGEN_REQUISITION_HOOK"`
+
+	// RequisitionFile overrides the file used to store the requisition. This
+	// file is placed inside the YNABBER_DATADIR.
+	RequisitionFile string `envconfig:"NORDIGEN_REQUISITION_FILE"`
 }
 
 // YNAB related settings

reader/nordigen/auth.go

@@ -18,7 +18,15 @@ const RequisitionRedirect = "https://raw.githubusercontent.com/martinohansen/yna
 
 // requisitionStore returns a clean path to the requisition file
 func (r Reader) requisitionStore() string {
-	return path.Clean(fmt.Sprintf("%s/%s.json", r.Config.DataDir, r.Config.Nordigen.BankID))
+	// Use BankID or RequisitionFile as filename
+	var file string
+	if r.Config.Nordigen.RequisitionFile == "" {
+		file = r.Config.Nordigen.BankID
+	} else {
+		file = r.Config.Nordigen.RequisitionFile
+	}
+
+	return path.Clean(fmt.Sprintf("%s/%s.json", r.Config.DataDir, file))
 }
 
 // Requisition tries to get requisition from disk, if it fails it will create a