Improve error message when plugin isn't found.

leiningen-core/src/leiningen/core/classpath.clj

@@ -6,7 +6,8 @@
             [clojure.string :as str]
             [leiningen.core.user :as user])
   (:import (java.util.jar JarFile)
-           (java.net URL)))
+           (java.net URL)
+           (org.sonatype.aether.resolution DependencyResolutionException)))
 
 ;; Basically just for re-throwing a more comprehensible error.
 (defn- read-dependency-project [root dep]
@@ -117,6 +118,12 @@
      :mirrors mirrors
      :transfer-listener :stdout
      :proxy (get-proxy-settings))
+    (catch DependencyResolutionException e
+      (binding [*out* *err*]
+        (println "Check :dependencies and :repositories for typos.")
+        (println "It's possible the specified jar is not in any repository.")
+        (println "If so, see \"Free-floating Jars\" under http://j.mp/repeatability"))
+      (throw (ex-info "Could not resolve dependencies" {:exit-code 1})))
     (catch Exception e
       (if (and (instance? java.net.UnknownHostException (root-cause e))
                (not offline?))

leiningen-core/src/leiningen/core/eval.clj

@@ -7,8 +7,7 @@
             [leiningen.core.user :as user]
             [leiningen.core.project :as project]
             [leiningen.core.main :as main]
-            [leiningen.core.classpath :as classpath])
-  (:import (org.sonatype.aether.resolution DependencyResolutionException)))
+            [leiningen.core.classpath :as classpath]))
 
 ;; # OS detection
 
@@ -55,13 +54,7 @@
 (defn prep [project]
   ;; This must exist before the project is launched.
   (.mkdirs (io/file (:compile-path project "/tmp")))
-  (try (classpath/get-classpath project)
-       (catch DependencyResolutionException e
-         (main/info (.getMessage e))
-         (main/info "Check :dependencies and :repositories for typos.")
-         (main/info "It's possible the specified jar is not in any repository.")
-         (main/info "If so, see \"Free-floating Jars\" under http://j.mp/repeatability")
-         (main/abort)))
+  (classpath/resolve-dependencies :dependencies project)
   (run-prep-tasks project)
   (.mkdirs (io/file (:compile-path project "/tmp")))
   (when-let [prepped (:prepped (meta project))]

leiningen-core/src/leiningen/core/main.clj

@@ -217,6 +217,8 @@ or by executing \"lein upgrade\". ")
         (project/load-plugins default-project)))
     (try (warn-chaining task-name args)
          (apply-task task-name project args)
+         (catch clojure.lang.ExceptionInfo e
+           (exit (:exit-code (ex-data e) 1)))
          (catch Exception e
            (when-let [[_ code] (and (.getMessage e)
                                     (re-find #"Process exited with (\d+)"

src/leiningen/trampoline.clj

@@ -40,7 +40,7 @@ than as a subprocess of Leiningen's project.
 
 Use this to save memory or to work around stdin issues."
   [project task-name & args]
-  ;; TODO: allow trampoline calls to chain with do
+  ;; TODO: allow trampoline calls to chain with do (does this already work?)
   (let [forms (atom [])]
     (when (:eval-in-leiningen project)
       (main/info "Warning: trampoline has no effect with :eval-in-leiningen."))

todo.org

@@ -7,8 +7,11 @@ See also https://github.com/technomancy/leiningen/issues
    - [ ] Recover from interrupted self-install (#719)
    - [ ] Honor :local-repo in trampoline (#695)
    - [ ] Improve speed of trampoline restarts (#573)
+   - [ ] Calculate trampoline classpath based on project at time of eval-in-project.
+   - [ ] Reduce verbosity of Aether. (#610)
    - [ ] Isolate target dir per profile (#468)
    - [ ] Honor mirror for search indices (#281)
+   - [ ] Allow search queries on any field. (#243)
    - [ ] Drop clojars snapshots from default repos (#241)
 ** 2.0.0-preview8
    - [X] Allow trampoline to work with chaining in do task (#665)