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Rich Already Answered That!

A list of commonly asked questions, design decisions, reasons why Clojure is the way it is as they were answered directly by Rich (even when from many years ago, those answers are pretty much valid today!). Feel free to point friends and colleagues here next time they ask (again). Answers are pasted verbatim (I've made small adjustments for readibility, but never changed a sentence) from mailing lists, articles, chats.

How to use:

• The link in the table of content jumps at the copy of the answer on this page.
• The link on the answer itself points back at the original post.

Table of Content

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Semantic Commit Messages

Format: <type>(<scope>): <subject>

<scope> is optional

Example

feat: add hat wobble

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Renew GPG key

Given that your key has expired.

$ gpg --list-keys
$ gpg --edit-key KEYID

Use the expire command to set a new expire date:

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*.clj  diff=clojure
*.cljs diff=clojure
*.cljx diff=clojure

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(defn form-spec [spec err-format]
  (with-meta (s/spec spec) {:err-format err-format}))

(s/def ::number (form-spec int? (fn [k v] (str (name k) " is not a valid number: " v))))
(s/def :address/apt (form-spec ::number (fn [_ v] (str "wrong apartment number: " v))))
(s/def :address/strno ::number)
(s/def :address/street string?)

(s/def ::addr (s/keys :req-un [:address/apt :address/street :address/strno]))

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;; https://matthewdowney.github.io/forcing-jvm-heap-dump-programmatically-clojure.html
(import 'java.lang.management.ManagementFactory)
(import 'com.sun.management.HotSpotDiagnosticMXBean)

(let [server (ManagementFactory/getPlatformMBeanServer)
      bean-name "com.sun.management:type=HotSpotDiagnostic"
      bean (ManagementFactory/newPlatformMXBeanProxy server bean-name HotSpotDiagnosticMXBean)
      live-objects-only? false]
  (.dumpHeap bean "dump.hprof" live-objects-only?))

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Virtual Hosts on nginx (CSC309)

When hosting our web applications, we often have one public IP address (i.e., an IP address visible to the outside world) using which we want to host multiple web apps. For example, one may wants to host three different web apps respectively for example1.com, example2.com, and example1.com/images on the same machine using a single IP address.

How can we do that? Well, the good news is Internet browsers

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lein update-in :dependencies conj \[nrepl/nrepl\ \"0.6.0\"\ \:exclusions\ \[org.clojure/clojure\]\] \
  -- update-in :plugins conj \[cider/cider-nrepl\ \"0.21.1\"\] \
  -- update-in :plugins conj \[refactor-nrepl\ \"2.4.0\"\] \
  -- "$@"

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.blob-num,
.blob-code-inner {
    font-size: 17px;
    font-family: "CamingoCode";
    -webkit-font-smoothing: subpixel-antialiased;
    line-height: 25px;
}

.blob-num,
.blob-code-inner,

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# Hello, and welcome to makefile basics.
#
# You will learn why `make` is so great, and why, despite its "weird" syntax,
# it is actually a highly expressive, efficient, and powerful way to build
# programs.
#
# Once you're done here, go to
# http://www.gnu.org/software/make/manual/make.html
# to learn SOOOO much more.