invoice

#!/bin/sh
# invoice - render an invoice (HTML) from postings tagged inv:<NUMBER>.
#
# Usage:
#   cat *.txt | postings | invoice 2024-001        # HTML to stdout
#   pta invoice 2024-001                            # via the dispatcher
#
# Files (all optional; missing DBs render blank fields, missing template
# falls back to an embedded one):
#   PTA_CUSTOMERS        clients DB   (default: $PTA_DIR/customers.txt)
#   PTA_COMPANY          seller DB    (default: $PTA_DIR/company.txt)
#   PTA_INVOICE_TEMPLATE HTML template (default: $PTA_DIR/invoice.template.html)
#   Copy customers.example -> customers.txt and company.example -> company.txt, then edit.
#
# Tunables: PTA_AR (receivables regex, default "receivable|pohladavky"),
#           PTA_CURRENCY (default EUR), PTA_TAX (VAT %, default 0),
#           PTA_DUE_DAYS (default 14).
#
# Render to PDF:
#   pta invoice 2024-001 | weasyprint - invoice-2024-001.pdf
#   pta invoice 2024-001 > i.html && wkhtmltopdf i.html invoice-2024-001.pdf

DIR="${PTA_DIR:-$(cd "$(dirname "$0")" && pwd)}"
INV="$1"

[ -z "$INV" ] && {
    echo "invoice: missing invoice number (usage: invoice 2024-001)" >&2
    exit 2
}

CUST="${PTA_CUSTOMERS:-$DIR/customers.txt}"
COMP="${PTA_COMPANY:-$DIR/company.txt}"
TPL="${PTA_INVOICE_TEMPLATE:-$DIR/invoice.template.html}"
[ -f "$CUST" ] || CUST=""
[ -f "$COMP" ] || COMP=""
[ -f "$TPL" ]  || TPL=""

exec gawk -v inv="$INV" \
          -v cust_file="$CUST" \
          -v comp_file="$COMP" \
          -v tpl_file="$TPL" \
          -f "$DIR/invoice.awk" -