Make BOOT_EMIT_TARGET=no the default -- fixes #391

Author: micha

boot/core/src/boot/core.clj

@@ -932,15 +932,8 @@
   state, and runs the pipeline."
   [task-stack]
   (binding [*warnings* (atom 0)]
-    (let [fs      (commit! (reset-fileset))
-          target? (not= "no" (boot.App/config "BOOT_EMIT_TARGET"))
-          depr    (delay (util/warn-deprecated "Implicit target dir is deprecated, please use the target task instead.\n")
-                         (util/warn-deprecated "Set BOOT_EMIT_TARGET=no to disable implicit target dir.\n"))
-          sync!   (if-not target?
-                    identity
-                    (comp (fn [_] @depr)
-                          (fileset-syncer [(get-env :target-path)] :clean true)))]
-      ((task-stack #(do (sync! %) (sync-user-dirs!) %)) fs))))
+    (let [fs (commit! (reset-fileset))]
+      ((task-stack #(do (sync-user-dirs!) %)) fs))))
 
 (defn boot
   "The REPL equivalent to the command line 'boot'. If all arguments are

boot/core/src/boot/main.clj

@@ -37,7 +37,7 @@
    ["-s" "--source-paths PATH"   "Add PATH to set of source directories."
     :assoc-fn #(update-in %1 [%2] (fnil conj #{}) %3)]
    ["-t" "--target-path PATH"    "Set the target directory to PATH."]
-   ["-T" "--no-target"           "Don't automatically write files to the target directory."]
+   ["-T" "--no-target"           "This option is ignored."]
    ["-u" "--update"              "Update boot to latest release version."]
    ["-U" "--update-snapshot"     "Update boot to latest snapshot version."]
    ["-v" "--verbose"             "More error info (-vv more verbose, etc.)"
@@ -140,9 +140,6 @@
       (util/exit-error
         (println (apply str (interpose "\n" errs)))))
 
-    (when (or (:no-target opts) (boot.App/isWindows))
-      (System/setProperty "BOOT_EMIT_TARGET" "no"))
-
     (when (:no-colors opts)
       (reset! util/*colorize?* false))
 

boot/core/src/boot/task/built_in.clj

@@ -41,7 +41,6 @@
                  ["" "BOOT_CLOJURE_VERSION"      "The version of Clojure boot will provide (1.8.0)."]
                  ["" "BOOT_CLOJURE_NAME"         "The artifact name of Clojure boot will provide (org.clojure/clojure)."]
                  ["" "BOOT_COLOR"                "Set to 'no' to turn colorized output off."]
-                 ["" "BOOT_EMIT_TARGET"          "Set to 'no' to disable automatic writing to target directory."]
                  ["" "BOOT_FILE"                 "Build script name (build.boot)."]
                  ["" "BOOT_GPG_COMMAND"          "System gpg command (gpg)."]
                  ["" "BOOT_HOME"                 "Directory where boot stores global state (~/.boot)."]