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DataMatrix reading via Quagga2 doesn't work currently, so default to an supported 1D barcode (=> Code128)
67 lines
2.2 KiB
Markdown
67 lines
2.2 KiB
Markdown
grocycode
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==========
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grocycode is, in essence, a simple way to reference to arbitrary grocy entities.
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Each grocycode includes a magic, an entitiy identifier, an id and an ordered set of extra data.
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It is supported to be entered anywhere grocy expects one to read a barcode, but can also reference
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grocy-internal properties like specific stock entries, or specific batteries.
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Serialization
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----
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There are three mandatory parts in a grocycode:
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1. The magic `grcy`
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2. An entity identifer matching the regular expression `[a-z]+` (that is, lowercase english alphabet without any fancy accents, minimum length 1 character).
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3. An object identifer matching the regular expression `[0-9]+`
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Optionally, any number of further data without format restrictions besides not containing any double colons [0] may be appended.
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These parts are then linearly appended, seperated by a double colon `:`.
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Entity Identifers
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----
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Currently, there are three different entity types defined:
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- `p` for Products
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- `b` for Batteries
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- `c` for Chores
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Example
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----
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In this example, we encode a *Product* with ID *13*, which results in `grcy:p:13` when serialized.
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Product grocycodes
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----
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Product grocycodes extend the data format to include an optional stock id, thus may reference a specific stock entry directly.
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Example: `grcy:p:13:60bf8b5244b04`
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Battery grocycodes
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----
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Currently, Battery grocycodes do not define any extra fields.
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Chore grocycodes
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----
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Currently, Chore grocycodes do not define any extra fields.
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Visual Encoding
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----
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Grocy uses DataMatrix 2D (or alternatively Code128 1D) Barcodes to encode grocycodes into a visual representation. In principle, there is no problem with using
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other encoding formats like QR codes; however DataMatrix uses less space for the same information and redundancy and is a bit
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easier read by 2D barcode scanners, especially on non-flat surfaces.
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You can pick up cheap-ish used scanners from ebay (about 45€ in germany). Make sure to set them to the correct keyboard emulation,
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so that the double colons get entered correctly.
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Notes
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---
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[0]: Obviously, it needs to be encoded into some usable visual representation and then read. So probably you only want to encode stuff that can be typed on a keyboard.
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