Minderbinder is a Clojure library for defining unit conversions available at read, compile and run time.
More information is available on the [Minderbinder source repo](https://github.com/fogus/minderbinder). Use ==== Include the following in your [Leiningen](https://github.com/technomancy/leiningen) project.clj file: [fogus/minderbinder "0.2.0"] Or include the following in your pom.xml file in the `dependencies` section: <dependency> <groupId>fogus</groupId> <artifactId>minderbinder</artifactId> <version>0.2.0</version> </dependency> Examples ======== Minderbinder includes unit conversions for the following units of measure: * [Time][t]: via `#unit/time`, base is `:milliseconds`, ns is `minderbinder.time` * [Length][l]: via `#unit/length`, base is `:meters`, ns is `minderbinder.length` * [Information][i]: via `#unit/info`, base is `:byte`, ns is `minderbinder.information` [t]: https://github.com/fogus/minderbinder/blob/master/src/minderbinder/time.clj [l]: https://github.com/fogus/minderbinder/blob/master/src/minderbinder/length.clj [i]: https://github.com/fogus/minderbinder/blob/master/src/minderbinder/information.clj Using Minderbinder's unit reader form -------------------------------------- (ns minderbinder.test.core (:require minderbinder.time)) (== #unit/time [1 :second] #unit/time [1000 :ms]) ;;=> true (== #unit/time [1 :minute 30 :seconds] #unit/time [90 :seconds]) ;;=> true Using Minderbinder's unit parse functions ----------------------------------------- (ns minderbinder.test.core (:require [minderbinder.length :as mbr])) (mbr/parse-length-unit [1 :km]) ;;=> 1000 (mbr/parse-length-unit [1 :ramsden-link]) ;;=> 381/1250 Defining custom conversion rules -------------------------------- Defining a unit conversion is accomplished via Minderbinder's `defunits-of` macro. The body of the macro expects the following structure: (defunits-of *unit-name* *base-unit-tag* *docstring* *conversion-spec*) The *conversion spec* part of the body currently allows pairs of mappings defined in reletive terms. The pairs always start with a keyword used as the unit tag. However, the right-hand side of the pair can be one of the following: 1. Number - defines the value of the unit relative to the base unit 2. Vector - defines the value of the unit relative to another contained unit 3. Keyword - defines a single alias for a unit 4. Set - defined one or more aliases for a unit A simplified version of Minderbinder's length conversion definition serves as an example: (defunits-of length :meter "The meter is the length of the path traveled by light in vacuum during a time interval of 1/299,792,458 of a second." :m :meter ;; an alias for the base unit :km 1000 ;; a larger value relative to the base unit :km #{kilometer kilometers} ;; multiple aliases for a unit :cm 1/100 ;; a smaller value relative to the base :mm [1/10 :cm]) ;; a value relative to another unit ### Generated vars The `defunits-of` macro will define three things in the namespace where the `defunits-of` macro appears: 1. `parse-XXX-unit` - a function that parses the unit vector according to the conversion spec, returning the total value relative to the base. 2. `unit-of-XXX` - a macro that allows the for `(unit-of-XXX 1 :foo)` that returns the total value relative to the base. 3. `XXX-table` - a map describing the unit conversion rules. Contributions welcomed! -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
