Add support for config file, implement CLI args

project.clj

@@ -1,4 +1,4 @@
-(defproject rss-thread-watch "0.3.7-SNAPSHOT"
+(defproject rss-thread-watch "0.3.8-SNAPSHOT"
   :description "RSS based thread watcher"
   :url "http://example.com/FIXME"
   :license {:name "AGPL-3.0-only"

src/rss_thread_watch/core.clj

@@ -23,7 +23,7 @@
             [rss-thread-watch.utils :as u])
   (:gen-class))
 
-(def VERSION "0.3.7")
+(def VERSION "0.3.8")
 
 ;; Internal default config
 (def CONFIG-DEFAULT
@@ -85,38 +85,49 @@
 
 (defn get-some-config
   "Attempts to get config somehow,
-   first from command line argument
-   then from ./config.edn file
-   lastly uses default internal"
-  ;; args do not include path to executable so first arg
-  ;; should be config file
-  [cmd-args]
+   first from [custom-file], if it's nil,
+   then from ./config.edn file.
+   If is neither exists, default internal one is used."
+  [custom-file]
   (config-fill-board-defaults
-   (let [file-to-try (u/nil?-else (first cmd-args)
+   ;; TODO: There has to be try/catch for when file is invalid edn
+   ;; This is gonna be done when config validation comes in Beta 2
+   (let [file-to-try (u/nil?-else custom-file
                                   "./config.edn")]
      (u/when-else (load-config file-to-try)
-      (println "WARN: Using default internal config because suggessted file: '" file-to-try "' not found.")
+
       CONFIG-DEFAULT))))
 
-;; Todo: Add option to write default config to stdout
 (defn -main
   "Entry point, starts webserver"
   [& args]
-  ;; Todo: Think of a way to start repeated download for every catalog efficiently
-  (let [config (get-some-config args)]
+  (let [parsed-args (parse-opts args cli-options)
+        options (get parsed-args :options)]
+    (when-let [err (get parsed-args :errors)]
+      (println "Error: " err)
+      (System/exit 1))
+    (when (get options :version)
+      (println "RSS Thread Watcher " VERSION " Licensed under AGPL-3.0-only")
+      (System/exit 0))
+    (when (get options :help)
+      (println "RSS Thread Watcher help:\n" (get parsed-args :summary))
+      (System/exit 0))
+    (when (get options :print-default-config)
+      (println ";;Default internal config file from RSS Thread Watcher " VERSION)
+      (clojure.pprint/pprint CONFIG-DEFAULT)
+      ;; In case someone was copying by hand, this might be useful
+      (println ";;END of Default internal config file")
+      (System/exit 0))
+
+    (let [config (get-some-config (:config options))]
+      ;; TODO: probably refactor to use separate config.clj file when validation will be added
       ;; Init the few globals we have
       (reset! watcher/GLOBAL-CONFIG config)
       (reset! feed/boards-enabled-cache (set (keys (get config :boards-enabled))))
       (reset! watcher/chod-threads-cache (watcher/generate-chod-cache-structure config))
-    (println args)
       (clojure.pprint/pprint config)
-    ;; Needs to be redone and probably removed from here
-    ;; (set-interval (fn []
-    ;;                 (println "Starting cache update")
-    ;;                 (watcher/update-board-cache! (:target config) (:starting-page config)))
-    ;;               (* 1000 (:refresh-delay config)))
       (jetty/run-jetty (rp/wrap-params feed/http-handler) {:port (:port CONFIG-DEFAULT)
-                                                         :join? true})))
+                                                           :join? true}))))
 
 ;; Docs: https://github.com/ring-clojure/ring/wiki/Getting-Started
 (defn repl-main

src/rss_thread_watch/utils.clj

@@ -77,3 +77,25 @@
    (empty m)
    (for [[key val] m]
      [key (f key val)])))
+
+(defn expand-home
+  "Expands ~ to home directory"
+  ;;modified from sauce: https://stackoverflow.com/questions/29585928/how-to-substitute-path-to-home-for
+  [s]
+  (if (clojure.string/starts-with? s "~")
+    (clojure.string/replace-first s "~" (System/getProperty "user.home"))
+    s))
+
+(defn expand-path
+  [s]
+  (if (clojure.string/starts-with? s "./")
+    (clojure.string/replace-first s "." (System/getProperty "user.dir"))
+    (expand-home s)))
+
+(defn file-exists?
+  "Returns true if file exists"
+  [file]
+  (let [path (if (vector? file)
+               (first file)
+               file)]
+    (.exists (clojure.java.io/file (expand-path path)))))