wdhowe

Git Commands Cheat Sheet

Configuration

List Current Global Settings

git config --global --list

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Debugging

Notes from watching Stuart Halloway's "Debugging with the Scientific Method" from Clojure/conj 2015.

Overview

Clear problem statement: steps you took, what you expected, what actually happened.

Efficient hypothesis: bisect the problem.

wdhowe

;; This macro is also available in: https://github.com/wdhowe/clj-contrib

(defmacro as-some->
  "as->, with the nil checking of some->.
   Binds name to expr. When name is not nil, evaluates the first
   form in the lexical context of that binding. When that result
   is not nil, then binds name to result, repeating for each
   successive form."
  [expr name & forms]
  (let [steps (map (fn [step] `(if (nil? ~name) nil ~step))

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.PHONY: build test deploy

##-- Environment Variables --#

# Image and container registry
IMAGE_NAME := my-image-name
IMAGE_PATH := mygroup/myproject
REGISTRY   := registry-url:port
IMAGE      := $(REGISTRY)/$(IMAGE_PATH)/$(IMAGE_NAME)

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Docker Image Running/Building Examples

The docker images can all be run/built similar to the following.

Variables

Setup the variables per image.

GitHub Example

davidvhill

;; Returns a function with retries.
;; retries: num of retries
;; delay: delay between retries in milliseconds
;; f: function to apply
;; ef: error function, determines if f should be retried
;; f and ef should not throw Exceptions

(defn with-retry
  [retries delay f ef]
  (fn [& args]

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Emacs Cheatsheet

A cheatsheet inspired by the book "Clojure for the Brave and True".

Shortcut Keys Used

• C = Control Key
• M = Meta Key (Alt on PCs, Option on Macs)

Examples:

davidvhill

(require '[clojure.edn :as edn])

;; props to didibus https://clojuredocs.org/clojure.core/num

(defn numberize
  [value]
  (edn/read-string value))