Add new functions for discovery and parsing of printers, WIP

poetry.lock

@@ -75,6 +75,25 @@ files = [
     {file = "blinker-1.9.0.tar.gz", hash = "sha256:b4ce2265a7abece45e7cc896e98dbebe6cead56bcf805a3d23136d145f5445bf"},
 ]
 
+[[package]]
+name = "brother-ql-inventree"
+version = "1.3"
+description = "Python package to talk to Brother QL label printers"
+optional = false
+python-versions = "*"
+groups = ["main"]
+files = [
+    {file = "brother_ql_inventree-1.3-py3-none-any.whl", hash = "sha256:0f7e0d78bae04f44bcfe1010ed0d99f98d5b4db1d6179da242d5bd52bb0c9ea4"},
+    {file = "brother_ql_inventree-1.3.tar.gz", hash = "sha256:24335ca5f4b3444c692698b599459a7e6c4bd036dd580074c63d39382914fca3"},
+]
+
+[package.dependencies]
+attrs = "*"
+click = "*"
+packbits = "*"
+pillow = ">=10.0.0"
+pyusb = "*"
+
 [[package]]
 name = "certifi"
 version = "2026.4.22"
@@ -974,6 +993,17 @@ files = [
     {file = "packaging-26.2.tar.gz", hash = "sha256:ff452ff5a3e828ce110190feff1178bb1f2ea2281fa2075aadb987c2fb221661"},
 ]
 
+[[package]]
+name = "packbits"
+version = "0.6"
+description = "PackBits encoder/decoder"
+optional = false
+python-versions = "*"
+groups = ["main"]
+files = [
+    {file = "packbits-0.6.tar.gz", hash = "sha256:bc6b370bb34e04ac8cfa835e06c0484380affc6d593adb8009dd6c0f7bfff034"},
+]
+
 [[package]]
 name = "pep8"
 version = "1.7.1"
@@ -1853,4 +1883,4 @@ h11 = ">=0.16.0,<1"
 [metadata]
 lock-version = "2.1"
 python-versions = ">=3.14"
-content-hash = "fd3fb42c796aaaee4193f31df09bb4c74277855c489bf34a27c4bc1616851dfb"
+content-hash = "18e1a5c8b085aa639b665279856f9e3c51a734a6a8d1d4dd135ca7e4f67e86ae"

pyproject.toml

@@ -42,6 +42,7 @@ dependencies = [
     "python-escpos (>=3.1,<4.0)",
     "pep8 (>=1.7.1,<2.0.0)",
     "pylint (>=4.0.5,<5.0.0)",
+    "brother-ql-inventree (>=1.3,<2.0)",
 ]
 
 [tool.poetry]

src/printer.py

@@ -1,5 +1,6 @@
 # Importing the module to manage the connection to the printer.
 import escpos.printer as escp
+import brother-ql-inventree
 from time import sleep, gmtime, strftime
 import os.path
 from PIL import Image, ImageEnhance, ImageOps
@@ -286,3 +287,93 @@ def process_image(self, path):
         original_img.save(jpeg_path, format="JPEG", quality=95, optimize=True)
 
     return jpeg_path
+
+def discover_printers():
+    """
+    We try to find all the connected printers ( 0 or n ) to this system.
+
+    For every type of supported printer, we try to autodiscover them.
+
+    http://www.linux-usb.org/usb.ids A list of USB vendor IDs
+
+    04b8  Seiko Epson Corp.
+    04f9  Brother Industries, Ltd
+    """
+
+def find_and_parse_borther_ql_printer():
+
+
+    ## We might be able to no use this because there is a `discover` command in https://github.com/pklaus/brother_ql#usage
+
+    ## Code stolen from https://framagit.org/stickoeur/diagnostickoeur/-/blob/no-masters/printit.py?ref_type=heads
+
+    """Find and parse Brother QL printer information."""
+
+    model_manager = ModelsManager()
+
+    # Debug print to show we're searching
+    # print("Searching for Brother QL printer...")
+
+    for backend_name in ["pyusb", "linux_kernel"]:
+        try:
+            #print(f"Trying backend: {backend_name}")
+            backend = backend_factory(backend_name)
+            available_devices = backend["list_available_devices"]()
+            #print(f"Found {len(available_devices)} devices with {backend_name} backend")
+
+            for printer in available_devices:
+                #print(f"Found device: {printer}")
+                identifier = printer["identifier"]
+                parts = identifier.split("/")
+
+                if len(parts) < 4:
+                    #print(f"Skipping device with invalid identifier format: {identifier}")
+                    continue
+
+                protocol = parts[0]
+                device_info = parts[2]
+                serial_number = parts[3]
+
+                try:
+                    vendor_id, product_id = device_info.split(":")
+                except ValueError:
+                    #print(f"Invalid device info format: {device_info}")
+                    continue
+
+                # Default model
+                model = "QL-570"
+
+                # Try to match product ID to determine actual model
+                try:
+                    product_id_int = int(product_id, 16)
+                    for m in model_manager.iter_elements():
+                        if m.product_id == product_id_int:
+                            model = m.identifier
+                            break
+                    #print(f"Matched printer model: {model}")
+                except ValueError:
+                    #print(f"Invalid product ID format: {product_id}")
+                    continue
+
+                printer_info = {
+                    "identifier": identifier,
+                    "backend": backend_name,
+                    "model": model,
+                    "protocol": protocol,
+                    "vendor_id": vendor_id,
+                    "product_id": product_id,
+                    "serial_number": serial_number,
+                }
+                #print(f"Found printer: {printer_info}")
+                return printer_info
+
+        except Exception as e:
+            #print(f"Error with backend {backend_name}: {str(e)}")
+            continue
+
+    print("No Brother QL printer found")
+    return None
+
+
+def fint_and_parse_epson_printer():
+    pass