henryw374

(ns com.widdindustries.safe-subs)


(defn subs-safe 
  "like clojure.core/subs but more forgiving"
  ([^String s start] (subs-safe s start (count s)))
  ([^String s start end]
   (when s 
     (let [end (if (> end (count s)) 
                 (count s)

henryw374

; demonstrating that offset names such as EST, CEST etc are not always parsed properly into ZonedDateTime.
; EST, CEST are defined as fixed offsets from UTC so are not ambiguous in that respect, although apparently the same abbreviation
; is used more than once for the same thing in some cases! Ideally they could be parsed to OffsetDateTime,
; but I can't find a way to get that working. Comment if you know how ;-)

; old parse api
(->
  (SimpleDateFormat. "M/d/y, H:m z")
  (.parse "3/26/2020, 14:00 EST"))

henryw374

(ns delete-on-close-fileinput-stream)

(defn create-fis [^java.io.File f]
  (proxy [java.io.FileInputStream] [f]
    (close []
      (try 
        (proxy-super close)
        (finally 
          (.delete f))))))
 

henryw374

(ns com.widdindustries.reagent-interval
  "functions to create reagent reactions (ie ratoms) whose value changes 
  as an argument function is called periodically"
  (:require [reagent.ratom :as ratom]
            [reagent.core :as r]))

(defn interval-async 
  "create ratom whose value will initially be initial-state, 
  and thereafter may change as f is called with the 'state' atom every delay-ms"
  [f delay-ms initial-state]

henryw374

(slingshot.slingshot/try+
 (kaocha.plugin.cloverage/cloverage-main-hook (kaocha.repl/config))
 (catch :kaocha/early-exit m
   (prn m)))

henryw374

(ns same-thread-executor
  "handy in unit tests to have things happen straight away"
  (:import (java.util.concurrent ExecutorService Future)))

(defn executor []
  (reify ExecutorService
     (^Future submit [_ ^Callable f]
         (let [r (f)]
           (reify Future
             (get [_] r))))))

henryw374

#!/usr/bin/env bb

; run the script from any dir to serve its files

(require '[babashka.deps])

(def deps '{:deps {io.github.babashka/http-server
        {:git/sha "b38c1f16ad2c618adae2c3b102a5520c261a7dd3"}}})

(babashka.deps/add-deps deps)

henryw374

#!/usr/local/bin/bb

(import '[java.io ByteArrayOutputStream])
(import '[java.util Base64]) ;
(import '[java.util.zip Inflater]) ;

(defn uncompress [source-bytes]
  (let [inflater (doto (Inflater.)
                   (.setInput source-bytes))
        outputStream (new ByteArrayOutputStream (count source-bytes))

niquola

hardware & os

• dotfiles?
• terminal & shell
• editor
• env setup - dbs, etc
• how do you start you REPL?
• deps or leningen?
• new project template?
• tasks automation - babashka?
• how do you navigate in project?

henryw374

(ns contiguous-spans
  "takes pre-sorted dates and returns contiguous periods contained therein. 
  
  see comment block for demo
  "
  (:require [tick.core :as t]))

(defn contiguous-spans
  "takes pre-sorted dates and returns contiguous periods contained.
  dates a and b are contiguous if a plus span-length is equal to b "