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Git Commands Cheat Sheet

Configuration

List Current Global Settings

git config --global --list

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#!/bin/bash

url=$1

echo | \
openssl s_client -showcerts -servername ${url} -connect ${url}:443 2>/dev/null | \
openssl x509 -inform pem -noout -text

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;; These protocols are also available in: https://github.com/wdhowe/clj-contrib

(defprotocol Errors
  "A protocol for finding errors in a collection."
  (errors [coll] "Returns a map of the `:counts/errors`, which are entries with `:error` keys."))

(extend-protocol Errors
  clojure.lang.Sequential
  (errors
    [coll]

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Error seen during git commands

"warning: ignoring broken ref refs/remotes/origin/HEAD"

The Fix

Check remote branches

git branch -r

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Simplicity

Notes from Rich Hickey's Simplicity Matters slides.

"Simplicity is the ultimate sophistication." -Leonardo da Vinci

Toolkit

Complexity	Simplicity

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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.

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;; 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

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Leiningen Plugins

Lein can be extended via plugins.

Some useful plugins are:

• lein-ancient -> Check your project for outdated dependencies and plugins, as well as upgrade them if desired.
• lein-exec -> Allows single clojure files to be executed and their requirements resolved.
• lein-localrepo -> Work with local Maven repository.
• lein-pprint -> Pretty-print a representation of the project map.