Bill Howe wdhowe

Emacs Cheatsheet

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

Examples:

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

Setup the variables per image.

GitHub Example

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

Efficient hypothesis: bisect the problem.

git config --global --list

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

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

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

	;; 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]

	.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)

	;; 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))