Add an option to read a message from a file.

.drone.yaml

@@ -0,0 +1,10 @@
+kind: pipeline
+type: docker
+name: default
+
+steps:
+  - name: test
+    image: clojure:temurin-11-lein-2.10.0-alpine
+    commands:
+      - lein test
+

src/cipher_analytical_machine/cli.clj

@@ -1,5 +1,6 @@
 (ns cipher-analytical-machine.cli
   (:require
+   [cipher-analytical-machine.file :as file]
    [cipher-analytical-machine.caesar :as caesar]
    [clojure.string :as cs]
    [clojure.tools.cli :refer [parse-opts]])
@@ -10,6 +11,7 @@
 
 (def cli-options
   [["-m" "--message MESSAGE" "The message will be encrypted or decrypted."]
+   ["-M" "--message-file MESSAGE-FILE" "The file contains the message that will be encrypted or decrypted."]
    ["-k" "--key KEY" "The key will be used to encrypt or decrypt."]
    ["-c" "--cipher CIPHER" "The cipher will be used to encrypt or decrypt a message."
     :default "Caesar"]
@@ -52,8 +54,12 @@
       (map-has-keys? options [:encrypt, :decrypt])
       {:exit-message (error-msg ["You can't use enctypt and decrypt mode at the same time!!!"])}
 
+      (map-has-keys? options [:message, :message-file])
+      {:exit-message (error-msg ["You can't use message and message-file options at the same time!!!"])}
+
       (and (map-has-keys? options [:cipher, :key])
-           (contains? options :message)
+           (or (contains? options :message)
+               (contains? options :message-file))
            (or (contains? options :encrypt)
                (contains? options :decrypt)))
       {:options options :arguments arguments}
@@ -66,10 +72,20 @@
   (println exit-message)
   (System/exit (if status 0 1)))
 
+(defn get-message
+  "Return the message"
+  [options arguments]
+  (cond
+    (contains? options :message)
+    (:message options)
+
+    (contains? options :message-file)
+    (file/read-file (:message-file options))))
+
 (defn actions
   [options arguments]
   (println (str options arguments))
-  (let [message (:message options)
+  (let [message (get-message options arguments)
         key (Integer/parseInt (:key options))
         symbols "abc"]
     (println

src/cipher_analytical_machine/file.clj

@@ -0,0 +1,18 @@
+(ns cipher-analytical-machine.file
+  (:require [clojure.java.io :as io])
+  (:gen-class))
+
+(defn is-file-exists?
+  "Checks that a file is exists"
+  [file-path]
+  (-> (io/file file-path)
+      (.exists)))
+
+(defn is-file-not-exists?
+  "Checks that a file is not exists"
+  [file-path]
+  (not (is-file-exists? file-path)))
+
+(defn read-file [file-path]
+  (slurp file-path))
+