codes - Card-balance Manager

codes was created to monitor the spending from various types of pre-paid accounts.

Its primary purpose is to keep track of balances on gift cards and display their corresponding barcodes for scanning by merchants.

Values are stored without units, effectively rendering the tool currency-agnostic.

Installation

Install dependencies listed by this command:

 _common/assert_environment.sh codes/codes.sh

[if using Sxmo] Activate the tool by linking it into userscripts:

 ln -s ~/sxmo-onfire/codes/codes.sh ~/.config/sxmo/userscripts/

If an image named <merchant>-<code>.png is found in $XDG_DATA_HOME/codes/, the Spend-menu offers to display it. Use - and = to zoom in and out.
If barcode_gen is available and the merchant is known (hard-coded), the image is generated automatically.
Spends are written to a CSV file that can be processed by hledger using the included rules file. Example: hledger print -f codes.csv --rules-file='codes.csv.rules'

shorten codes for display to fit into portrait-mode (until implemented, you may want to save screen-space by adding only the last digits of a code - e.g. 22881 instead of XYZ999300022881; note that this breaks automatic barcode-generation)
support comments in spends: 22.35 # silver
support equal-sign in spends to set to a new balance: =20
support entering expiration dates for codes
order cards by expiration dates
offer previously used amounts for top-up or fall back to a ladder of default ones
if barcode format for a merchant is unknown, offer common types to generate, storing files with suffixes (supported: EAN13, EAN8, CODE39, CODE93, CODE11, CODE128, CODABAR, ITF, STF)
consider image files whose tags are never mentioned in the CSV as new and show a tag (with zero balance) for top up; extend Usage#2 to reflect the change

To avoid unexpected behaviour, be sure to use a tagged commit where available.