如何在编译时获取项目版本

Question

我在cljc文件中有以下代码:

(ns proj
  #?(:cljs
     (:require-macros
       [proj :refer [define-project-version]])))

(declare project-version)

#?(:clj
   (defmacro define-project-version []
 `(def ~'project-version ~(first (drop 2 (read-string (slurp "project.clj")))))))

(define-project-version)

当在clj文件中使用和启动REPL时,这确实有效.但是,当我制作一个uberjar并尝试运行它时,我得到一个关于project.clj的例外 - "没有这样的文件或目录." 错误来自ClojureScript部分.uberjar编译得很好.

为什么代码试图加载project.clj？是不是应该在编译时运行宏？

Answer 1

To access files from a Clojure application in an Uberjar, the files should be places in a resources directory that is on the classpath. In a typical Leiningen project, this would be resources in the root of the project.

A different path can be explicitly defined by adding :resource-paths ["src/main/resource"] to the project.clj project configuration file.

Files can then be accessed using the clojure.java.io/resource function, for example a file located at resources/hello.txt

; Use clojure.java.io/resource to read resources from the classpath:

(ns rescue.core
  (:require [clojure.java.io :as io] ))


(def data-file (io/resource 
                   "hello.txt" ))
(defn -main []
  (println (slurp data-file)) )

This can be checked opening a terminal in the root of the project and running the command java -jar uberjar-name.jar