Feature: Allow tagging by putting barcode stickers on documents (#5580)

docs/configuration.md

@@ -1173,6 +1173,55 @@ combination with PAPERLESS_CONSUMER_BARCODE_UPSCALE bigger than 1.0.
 
     Defaults to "300"
 
+#### [`PAPERLESS_CONSUMER_ENABLE_TAG_BARCODE=<bool>`](#PAPERLESS_CONSUMER_ENABLE_TAG_BARCODE) {#PAPERLESS_CONSUMER_ENABLE_TAG_BARCODE}
+
+: Enables the detection of barcodes in the scanned document and
+assigns or creates tags if a properly formatted barcode is detected.
+
+    The barcode must match one of the (configurable) regular expressions.
+    If the barcode text contains ',' (comma), it is split into multiple
+    barcodes which are individually processed for tagging.
+
+    Matching is case insensitive.
+
+    Defaults to false.
+
+#### [`PAPERLESS_CONSUMER_TAG_BARCODE_MAPPING=<json dict>`](#PAPERLESS_CONSUMER_TAG_BARCODE_MAPPING) {#PAPERLESS_CONSUMER_TAG_BARCODE_MAPPING}
+
+: Defines a dictionary of filter regex and substitute expressions.
+
+    Syntax: {"<regex>": "<substitute>" [,...]]}
+
+    A barcode is considered for tagging if the barcode text matches
+    at least one of the provided <regex> pattern.
+
+    If a match is found, the <substitute> rule is applied. This allows very
+    versatile reformatting and mapping of barcode pattern to tag values.
+
+    If a tag is not found it will be created.
+
+    Defaults to:
+
+    {"TAG:(.*)": "\\g<1>"} which defines
+    - a regex TAG:(.*) which includes barcodes beginning with TAG:
+      followed by any text that gets stored into match group #1 and
+    - a substitute \\g<1> that replaces the original barcode text
+      by the content in match group #1.
+    Consequently, the tag is the barcode text without its TAG: prefix.
+
+    More examples:
+
+    {"ASN12.*": "JOHN", "ASN13.*": "SMITH"} for example maps
+    - ASN12nnnn barcodes to the tag JOHN and
+    - ASN13nnnn barcodes to the tag SMITH.
+
+    {"T-J": "JOHN", "T-S": "SMITH", "T-D": "DOE"} directly maps
+    - T-J barcodes to the tag JOHN,
+    - T-S barcodes to the tag SMITH and
+    - T-D barcodes to the tag DOE.
+
+    Please refer to the Python regex documentation for more information.
+
 ## Audit Trail
 
 #### [`PAPERLESS_AUDIT_LOG_ENABLED=<bool>`](#PAPERLESS_AUDIT_LOG_ENABLED) {#PAPERLESS_AUDIT_LOG_ENABLED}