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----
-title: On the Architecture of a tool-set for interacting with character-oriented printers
-published: 2015-12-25
-tags: Thermoprint
----
-
-# Motivation
-
-Some time ago I bought a cheap Chinese
-[thermoprinter](https://en.wikipedia.org/wiki/Thermal_printing) off eBay.
-As expected the printers firmware is really awkward to use (including binary
-control codes used to switch between char sets such as bold, italic, underlined,
-etc.).
-The obvious solution was to write a library to parse a more sensible
-representation and send it to be printed.
-
-Since there might, at some point, be other users wanting to print to my
-acquisition the architecture is intended to be present a somewhat usable
-interface to the uninitiated.
-
-# Implementation
-
-## Location
-
-Recently I created a new branch in
-[thermoprint](https://git.yggdrasil.li/thermoprint) called
-[rewrite](https://git.yggdrasil.li/thermoprint?h=rewrite).
-
-## Architecture Overview
-
-The new macroscopic architecture I´m currently aiming for is quite similar to
-the old one:
-
- * A server intended to run on the machine connected to my cheap printer talking
-   directly to the printer on one end and serving a
-   [json api](https://hackage.haskell.org/package/servant) on the other.
- * A (hopefully) tiny cli tool for debugging and personal use.
- * A website (it will probably end up being based on
-   [yesod](https://hackage.haskell.org/package/yesod)) presenting a web interface
-   similar to the cli tool.
-
-## Features
-
-Features I intend to implement include:
-
-  * A parser for a bbcode-dialect which should be used in both the cli tool and the
-    website (it will probably end up using
-    [attoparsec](https://hackage.haskell.org/package/attoparsec)) -- bbcode as
-    presented on [Wikipedia](https://en.wikipedia.org/wiki/BBCode) is a proper
-    superset of the feature-set of my cheap Chinese printer.
-  * Reasonable test coverage using
-    [QuickCheck](https://hackage.haskell.org/package/QuickCheck),
-    [HUnit](http://hackage.haskell.org/package/HUnit).
-   
-    Automatic testing with [cabal](https://www.haskell.org/cabal/) facilitated by
-    [hspec](https://hackage.haskell.org/package/hspec).
-  * Support and server-side storage for drafts.
-  * The Website should provide some richer formats than bbcode which will
-    probably find inclusion in the payload datastructure such as lists,
-    checklists, tables, etc.
-
-    The cli-tool should be able to use these too (the input will probably end up
-    being json-formatted).
-
-## Work so far
-
-### Prototype
-
-I already have a prototype.
-It's quite bug-ridden and has recently developed serious problems actually
-printing after working satisfactorily for a few weeks.
-
-It also does not include a web-interface and I am quite unsatisfied with the
-overall code quality.
-
-The [685 lines of code](http://cloc.sourceforge.net/) can be found in the
-[repo](https://git.yggdrasil.li/thermoprint?h=master) as well.
-
-### Rewrite
-
-Currently the [rewrite](https://git.yggdrasil.li/thermoprint?h=rewrite) contains a
-single file of moment -- spec/src/Thermoprint/Printout.hs -- wherein we define
-the payload for the api -- our take on a structured document format (somewhat
-inspired by
-[pandoc](http://hackage.haskell.org/package/pandoc-types/docs/Text-Pandoc-Definition.html)):
-
-~~~ {.haskell}
--- | A 'Printout' is a sequence of visually seperated 'Paragraph's
-type Printout = Seq Paragraph
-
--- | A 'Paragraph' is a non-seperated sequence of 'Chunk's
-type Paragraph = Seq Chunk
-
--- | We introduce both 'Chunk' and 'Paragraph' mainly to allow 'Raw'.
--- 
--- Were we to disallow 'Raw', 'Block' would be identical to 'Paragraph'
-data Chunk = Cooked Block -- ^ text semantically structured to be rendered in accordance with the display format of printer
-           | Raw ByteString -- ^ direct instructions to the printer
-           deriving (Generic, NFData, Show, CoArbitrary)
-
--- | 'Block' is the entry point for our structured document format
-data Block = Line Line -- ^ a single 'Line' of text
-           | VSpace Integer -- ^ vertical space of height equivalent to 'Integer' lines
-           | NewlSep (Seq Block) -- ^ A sequence of 'Block's seperated by newlines
-           deriving (Generic, NFData, Show, CoArbitrary)
-
-{- | A 'Line' is one of:
-
-  * a single word
-  * horizontal space equivalent to the width of 'Integer' `em`.
-  * a sequence of words seperated by spaces
-
-We don't export all constructors and instead encourage the use of 'text'.
--} 
-data Line = Word Text
-          | HSpace Integer
-          | SpaceSep (Seq Line)
-          deriving (Generic, NFData, Show, CoArbitrary)
-~~~
-
-(The code is verbatim as of 8307d7e).
-
-<!--  LocalWords:  Thermoprint thermoprint json api cli yesod bbcode attoparsec
- -->
-<!--  LocalWords:  superset QuickCheck HUnit hspec datastructure repo pandoc
- -->
-<!--  LocalWords:  haskell ByteString NFData CoArbitrary VSpace
- -->
-<!--  LocalWords:  NewlSep HSpace SpaceSep
- -->