container: hledger-flow: btcpayserver: add uniform quotes

- Allows undesirable characters in variable-text columns
- Related refactoring

container/src/hledger-flow/accounts/btcpayserver/btcpayserver-shared.bash

@@ -2,7 +2,7 @@
 
 # docker-finance | modern accounting for the power-user
 #
-# Copyright (C) 2021-2025 Aaron Fiore (Founder, Evergreen Crypto LLC)
+# Copyright (C) 2021-2026 Aaron Fiore (Founder, Evergreen Crypto LLC)
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -74,7 +74,9 @@ function btcpayserver::print_warning()
 # "Legacy Invoice" report
 function btcpayserver::legacy()
 {
-  gawk -v global_year="$global_year" -v global_subaccount="$global_subaccount" \
+  gawk --csv \
+    -v global_year="$global_year" \
+    -v global_subaccount="$global_subaccount" \
     '{
        if (NR<2 || $1 !~ global_year)
          next
@@ -126,9 +128,10 @@ function btcpayserver::legacy()
        printf $21 OFS  # InvoiceSubtotal
        printf $22 OFS  # InvoiceItemCode
 
-       # TODO: if description contains comma(s)?
+       # InvoiceItemDesc
        sub(/%/, "%%", $23)
-       printf $23 OFS  # InvoiceItemDesc
+       gsub(/"/, "", $23)
+       printf "\"" $23 "\"" OFS
 
        printf $24 OFS  # InvoiceFullStatus
        printf $25 OFS  # InvoiceStatus
@@ -141,7 +144,7 @@ function btcpayserver::legacy()
        printf global_subaccount  # Subaccount
 
        printf "\n"
-    }' FS=, OFS=, "$global_in_path"
+    }' OFS=, "$global_in_path"
 }
 
 # "Payments" report
@@ -173,7 +176,9 @@ function btcpayserver::sales()
 # "Wallets" report
 function btcpayserver::wallets()
 {
-  gawk -v global_year="$global_year" -v global_subaccount="$global_subaccount" \
+  gawk --csv \
+    -v global_year="$global_year" \
+    -v global_subaccount="$global_subaccount" \
     '{
        if (NR<2 || $1 !~ global_year)
          next
@@ -238,7 +243,7 @@ function btcpayserver::wallets()
        printf global_subaccount  # Subaccount
 
        printf "\n"
-    }' FS=, OFS=, "$global_in_path"
+    }' OFS=, "$global_in_path"
 }
 
 function btcpayserver::parse()