cmdline

Small wrapper around command line parsing with clojure.tools.cli

Why?

Combine named command line arguments from three sources:

1. Explicitly given on the command line.
2. Given in a user defined config file.
3. Defaults as given in the source code.

Installation

Leiningen/Boot

[ndevreeze/cmdline "0.2.0"]

Clojure CLI/deps.edn

ndevreeze/cmdline {:mvn/version "0.2.0"}

Usage

Require:

(ns my.namespace
  (:require [nl.nicodevreeze.cmdline :as cl]))

Define the command line options:

(def cli-options
  [["-c" "--config CONFIG" "Config file"
    :default "~/.config/my-program/my-program.edn"]
   ["-h" "--help" "Show this help"]
   ["-p" "--port PORT" "TCP port to use"
    :default 1234 :parse-fn #(Integer/parseInt %)]
   ["-v" "--verbose" "Verbose output"]])

Define the worker function:

(defn do-script
  "Main script"
  [opt arguments ctx]
  (when (:verbose opt)
    (output-some-more)))

Small -main function:

(defn -main [& args]
  (cl/check-and-exec "Description of script"
                     cli-options do-script args ctx))

Ctx/context can be anything, mostly a map.

Developing

Testing

$ lein midje

or:

$ lein repl (or start in Cider)
(use 'midje.repl)
(autotest)

Bugs

• No known errors, see Github/issues.

Related and similar projects (libraries)

• https://github.com/clojure/tools.cli - main library for parsing options.

License

Copyright © 2021 Nico de Vreeze

Distributed under the Eclipse Public License, the same as Clojure.