add resource renamer script

resource-renamer/readme.md

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+# Resource Renamer
+A tool that enables you to quickly rename a single Android resource that is already split up into multiple folders, e.g. `drawable-xhdpi`, `drawable-xxhdpi`, ...
+It will reuse the file extension of the files that are already present inside the directory.
+
+## Example Usage
+```bash
+./rr.clj -d "/home/schrofi/Downloads/random_asset" -n "ic_photo"
+```
+
+## 
+### Fish
+To more conveniently use the tool from the commandline, you can define a fish function like this:
+```
+function rr 
+    PATH_TO_SCRIPT/rr.clj -d $(pwd) -n $argv[1]
+end
+
+funcsave rr
+```
+
+And then just use the tool by opening a terminal in the resource folder you want to rename and execute `rr TARGET_NAME`.

resource-renamer/rr.clj

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+#!/usr/bin/env bb
+
+(require '[clojure.tools.cli :refer [parse-opts]])
+
+(def cli-options
+  [["-d" "--directory DIRECTORY" "Directory"]
+   ["-n" "--name NAME" "Target resource name"]])
+
+(def options (:options (parse-opts *command-line-args* cli-options)))
+
+(defn- rename-child
+  [folder target-name]
+  (let [files (.listFiles folder)]
+    (if (= (count files) 1)
+      (let [resource (first files)
+            extension (last (str/split (.getName resource) #"\."))]
+        (when (nil? extension) (throw (.Exception "file does not have a file extension")))
+        (.renameTo resource (io/file (str (.getParent resource) (java.io.File/separator) target-name "." extension))))
+      (throw (.Exception "directories need to contain exactly one file")))))
+
+(let [directory (io/file (:directory options))]
+  (doseq [subdirectory (.listFiles directory)]
+    (rename-child subdirectory (:name options))))