The Expressive C++17 Coding Challenge in Clojure (see https://words.steveklabnik.com/the-expressive-c-17-coding-challenge-in-rust-revisited)

deps.edn

{:deps {org.clojure/tools.cli {:mvn/version "0.3.7"}
        org.clojure/data.csv {:mvn/version "0.1.4"}
        semantic-csv {:mvn/version "0.2.1-alpha1"}}}

main.clj

(ns main
  (:require
   [clojure.java.io :as io]
   [clojure.tools.cli :refer [parse-opts]]
   [clojure.data.csv :refer [write-csv]]
   [semantic-csv.core :as csv])
  (:gen-class))

(def cli-options
  [["-f" "--filename CSVFILE"]
   ["-c" "--column-name COLUMN"]
   ["-r" "--replacement STRING"]
   ["-o" "--output-filename CSVFILE"]])

(defn -main [& args]
  (let [{{:keys [filename column-name replacement output-filename]} :options} (parse-opts args cli-options)]
    (with-open [reader (io/reader filename)
                writer (io/writer output-filename)]
      (->> (csv/parse-and-process reader :keyify false)
           (map #(assoc % column-name replacement))
           csv/vectorize
           (write-csv writer)))))