Add SHA to Project Manifest

.gitignore

@@ -7,4 +7,5 @@ pom.xml
 *.class
 .lein-deps-sum
 .lein-failures
-.lein-plugins
+.lein-plugins
+.idea

README.md

@@ -6,12 +6,12 @@ current branch.
 ## Usage
 
 To be able to access the plugin from any project, put
-`[lein-sha-version "0.1.1"]` into the `:plugins` vector of your `:sha`, or other
+`[coreagile/lein-sha-version "0.1.2"]` into the `:plugins` vector of your `:sha`, or other
 non-standard, profile. Invoke `lein` with `lein with-profile sha` to use the sha
 version number for the project, e.g. `lein with-profile sha deploy clojars` to
 deploy the sha based version to clojars.
 
-Put `[lein-sha-version "0.1.1"]` into the `:plugins` vector of your `:dev`
+Put `[coreagile/lein-sha-version "0.1.2"]` into the `:plugins` vector of your `:dev`
 profile in `project.clj` if you always want to use a sha version with a specific
 project.
 
@@ -22,6 +22,14 @@ To control the length of the generated SHA, you can set the `:length` key under
 :sha {:length 8}
 ```
 
+To add the generated SHA to your artifacts' `MANIFEST.MF`, you can set the
+`:manifest-header` to your project or profile. The SHA will be written to that
+header in your jar and/or uberjar.
+
+```clj
+:sha {:manifest-header "Implementation-Version"}
+```
+
 ## License
 
 Copyright © 2012 Hugo Duncan

project.clj

@@ -1,4 +1,4 @@
-(defproject lein-sha-version "0.1.2-SNAPSHOT"
+(defproject coreagile/lein-sha-version "0.1.2"
   :description "A Leiningen plugin to set the project version based on the git SHA."
   :url "https://github.com/pallet/lein-sha-version"
   :license {:name "Eclipse Public License"

src/lein_sha_version/plugin.clj

@@ -1,24 +1,38 @@
 (ns lein-sha-version.plugin
   (:use
-   [clojure.java.io :only [file]]
-   [leiningen.core.main :only [debug]])
+    [clojure.java.io :only [file]]
+    [leiningen.core.main :only [warn debug]])
   (:import
-   org.eclipse.jgit.storage.file.FileRepositoryBuilder
-   [org.eclipse.jgit.lib ObjectId Repository]))
+    org.eclipse.jgit.storage.file.FileRepositoryBuilder
+    [org.eclipse.jgit.lib ObjectId Repository]))
 
 (defn git-sha [{:keys [root version sha]}]
   (debug "Finding SHA for" root)
-  (let [^Repository repository (.. (FileRepositoryBuilder.)
-                                   (readEnvironment)
-                                   (findGitDir (file root))
-                                   (build))
-        ^ObjectId head (.resolve repository "HEAD")]
-    (if head
-      (let [abbr (.abbreviate head (:length sha 7))]
-        (debug "Found SHA" (.name head) "using" (.name abbr))
-        (.name abbr))
+  (try
+    (let [^Repository repository (.. (FileRepositoryBuilder.)
+                                     (readEnvironment)
+                                     (findGitDir (file root))
+                                     (build))
+          ^ObjectId head (.resolve repository "HEAD")]
+      (if head
+        (let [abbr (.abbreviate head (:length sha 7))]
+          (debug "Found SHA" (.name head) "using" (.name abbr))
+          (.name abbr))
+        version))
+    (catch Throwable e
+      (warn (format "Unable to get SHA: %s" (.getMessage e)))
       version)))
 
+(defn update-manifest [git-sha {manifest                  :manifest
+                                {:keys [manifest-header]} :sha}]
+  (if manifest-header
+    (merge {manifest-header git-sha} manifest)
+    manifest))
+
 (defn middleware
   [project]
-  (assoc project :version (git-sha project)))
+  (let [version (git-sha project)
+        manifest (update-manifest version project)]
+    (-> project
+        (assoc :version version)
+        (assoc :manifest manifest))))