Add lessjs task

This task uses npm in order to install and launch the lessc compiler against
the input .less file. The output will be included into the fileset by default.

At the moment only the --include-dirs option is handled and passed to lessc.

boot.properties

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+BOOT_VERSION=2.7.2

build.boot

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+(set-env! :dependencies  '[[org.clojure/clojure "1.8.0" :scope "provided"]
+                           [degree9/boot-npm    "1.7.0-SNAPSHOT"]
+                           [adzerk/bootlaces    "0.1.13" :scope "test"]
+                           [degree9/boot-semver "1.6.0" :scope "test"]]
+          :resource-paths   #{"src"})
+
+(require '[degree9.boot-semver :refer :all])
+
+(task-options!
+ pom    {:project 'degree9/boot-css
+         :description "CSS Preprocessors for boot-clj."
+         :url         "https://github.com/degree9/boot-exec"
+         :scm         {:url "https://github.com/degree9/boot-exec"}})
+
+(deftask develop
+  "Build boot-css for development."
+  []
+  (comp
+   (version :develop true
+            :minor 'inc
+            :patch 'zero
+            :pre-release 'snapshot)
+   (watch)
+   (target)
+   (build-jar)))
+
+(deftask deploy
+  "Build boot-css and deploy to clojars."
+  []
+  (comp
+   (version)
+   (target)
+   (build-jar)
+   (push-release)))

src/degree9/boot_css.clj

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+(ns degree9.boot-css
+  (:require [boot.core :as boot]
+            [clojure.string :as str]
+            [clojure.java.io :as io]
+            [boot.util :as u]
+            [degree9.boot-npm :as npm]))
+
+(boot/deftask lessc
+  "Compile CSS using the npm version of Less."
+  [l less-path    PATH  str    "Path to the .less file to compile (relative to the fileset)."
+   i include-dirs PATH  #{str} "Include directories for lessc."]
+  (let [tmp (boot/tmp-dir!)]
+    (boot/with-pre-wrap [fs]
+      (let [less-tmp (boot/tmp-get fs less-path)]
+        (assert less-tmp (format "Less-path (%s) should point to a file in the classpath." less-path))
+        (let [compiled-file (io/file tmp (str/replace less-path #"\.less$" ".css"))
+              include-dirs (->> [(boot/tmp-dir less-tmp)]
+                                (into (or include-dirs #{}))
+                                (str/join ":"))
+              mw (npm/exec :module "less"
+                           :process "lessc"
+                           :arguments [(str "--include-path=" include-dirs)
+                                       (-> less-tmp boot/tmp-file .getAbsolutePath)
+                                       (.getAbsolutePath compiled-file)])]
+          (u/dbug* "Less boot dir: %s\n" (boot/tmp-dir less-tmp))
+          (u/dbug* "Less boot file: %s\n" (-> less-tmp boot/tmp-file .getAbsolutePath))
+          (u/dbug* "Less boot target: %s\n" (.getAbsolutePath compiled-file))
+
+          ((mw identity) fs) ;; only for side effects on tmp folder
+          (-> fs (boot/add-resource tmp) boot/commit!))))))

version.properties

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+#Mon May 01 18:58:18 MDT 2017
+VERSION=1.0.0