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Merge pull request #443 from scgilardi/master

javac: check .java vs. .class mod dates, only compile stale sources
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technomancy committed Mar 12, 2012
2 parents 6141fdc + a7d73d8 commit 4e8f4613813992064c3626708385018711ad12db
Showing with 17 additions and 10 deletions.
  1. +17 −10 src/leiningen/javac.clj
@@ -3,15 +3,22 @@
(:require [leiningen.classpath :as classpath]
[leiningen.core.main :as main]
[ :as io])
- (:import
+ (:import
-;; There is probably a more efficient way to do this, but this is cool
-;; too.
-(defn extract-java-source
- "Find all of the Java source files in a directory."
- [dir]
- (filter #(.endsWith % ".java")
- (map #(.getPath %) (file-seq (io/file dir)))))
+(defn stale-java-sources
+ "Returns a lazy seq of file paths: every Java source file within
+ dirs modified since it was most recently compiled into
+ compile-path."
+ [dirs compile-path]
+ (for [dir dirs
+ ^File source (filter #(-> ^File % (.getName) (.endsWith ".java"))
+ (file-seq (io/file dir)))
+ :let [rel-source (.substring (.getPath source) (inc (count dir)))
+ rel-compiled (.replaceFirst rel-source "\\.java$" ".class")
+ compiled (io/file compile-path rel-compiled)]
+ :when (>= (.lastModified source) (.lastModified compiled))]
+ (.getPath source)))
;; Tool's .run method expects the last argument to be an array of
;; strings, so that's what we'll return here.
@@ -35,8 +42,8 @@
(defn- run-javac-task
"Run javac to compile all source files in the project."
[project args]
- (let [files (mapcat extract-java-source (:java-source-paths project))
- compile-path (:compile-path project)]
+ (let [compile-path (:compile-path project)
+ files (stale-java-sources (:java-source-paths project) compile-path)]
(when (pos? (count files))
(if-let [compiler (ToolProvider/getSystemJavaCompiler)]

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