├── README.org
├── build.boot
└── src
    └── danielsz
        └── autoprefixer.clj


/README.org:
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 1 | * Boot-autoprefixer
 2 | 
 3 | Boot task for [[https://github.com/postcss/autoprefixer][autoprefixer]].
 4 | 
 5 | #+BEGIN_QUOTE
 6 | Autoprefixer utilizes the most recent data from Can I Use to add only necessary vendor prefixes.
 7 | #+END_QUOTE
 8 | 
 9 | ** Requirements
10 | 
11 | Make sure postcss-cli and autoprefixer are installed on your system.
12 | #+BEGIN_SRC clojure
13 | npm install --global postcss-cli autoprefixer
14 | #+END_SRC
15 | 
16 | ** Installation
17 | 
18 | [[https://clojars.org/danielsz/boot-autoprefixer][https://img.shields.io/clojars/v/danielsz/boot-autoprefixer.svg]]
19 | 
20 | 
21 | ** Usage
22 | 
23 | In *build.boot*,  import the *autoprefixer* task:
24 | 
25 | #+BEGIN_SRC clojure
26 | (set-env! :dependencies '[[danielsz/boot-autoprefixer "x.x.x"]]) ; latest release is indicated above 
27 | (require '[danielsz.autoprefixer :refer [autoprefixer]])
28 | #+END_SRC
29 | 
30 | The autoprefixer task takes a vector of filenames, the CSS files you want to post-process with autoprefixer.
31 | 
32 | #+BEGIN_SRC clojure
33 | (task-options! autoprefixer {:files ["style-1.css" "style-2.css"]})
34 | #+END_SRC
35 | 
36 | Autoprefixer uses [[https://github.com/ai/browserslist][Browserslist]], so you can specify the browsers you
37 | want to target in your project by queries like =last 2 versions= or => 5%=
38 | 
39 | #+BEGIN_SRC clojure
40 | (task-options! autoprefixer {:files ["style-1.css" "style-2.css"]
41 |                              :browsers "last 2 versions"})
42 | #+END_SRC
43 | 
44 | You can now compose *autoprefixer* in your boot pipeline like any other task.
45 | 
46 | An alternate way of going about this is to forgo *task-options!* and instead use keyword arguments.
47 | 
48 | #+BEGIN_SRC clojure
49 | (comp
50 |  (cljs :source-map true)
51 |  (autoprefixer :files ["style-1.css" "style-2.css"] 
52 |                :browsers "last 2 versions"))
53 | #+END_SRC
54 | 


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/build.boot:
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 1 | (set-env!
 2 |  :source-paths   #{"src"}
 3 |  :resource-paths #{"src"})
 4 | 
 5 | (task-options!
 6 |  push {:repo-map {:url "https://clojars.org/repo/"}}
 7 |  pom {:project 'danielsz/boot-autoprefixer
 8 |       :version "0.1.0"
 9 |       :scm {:name "git"
10 |             :url "https://github.com/danielsz/boot-autoprefixer"}})
11 | 
12 | (deftask build
13 |   []
14 |   (comp (pom) (jar) (install)))
15 | 
16 | (deftask push-release
17 |   []
18 |   (comp
19 |    (build)
20 |    (push)))
21 | 


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/src/danielsz/autoprefixer.clj:
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 1 | (ns danielsz.autoprefixer
 2 |   {:boot/export-tasks true}
 3 |   (:require
 4 |    [clojure.java.io :as io]
 5 |    [boot.pod        :as pod]
 6 |    [boot.core       :as core]
 7 |    [boot.util       :as util]
 8 |    [boot.tmpdir     :as tmpd]))
 9 | 
10 | (defn- find-css-files [fs files]
11 |   (->> fs
12 |        core/input-files
13 |        (core/by-name files)
14 |        (map (juxt core/tmp-path core/tmp-file identity))))
15 | 
16 | (core/deftask autoprefixer
17 |   [p exec-path PATH        str   "PostCSS executable path (defaults to \"postcss\" if omitted)."
18 |    f files     FILES       [str] "A vector of filenames to process with autoprefixer."
19 |    b browsers  BROWSERS    str   "A string describing browsers autoprefixer will target.
20 |    Eg:  \"last 1 version, > 5%\".
21 |    More details at https://github.com/ai/browserslist"]
22 |   (let [tmp-dir (core/tmp-dir!)]
23 |     (core/with-pre-wrap fileset
24 |       (doseq [[in-path in-file file] (find-css-files fileset files)]
25 |         (boot.util/info "Autoprefixing %s\n" (:path file))
26 |         (let [out-file (doto (io/file tmp-dir in-path) io/make-parents)
27 |               postcss (or exec-path "postcss")
28 |               args    (if browsers ["--autoprefixer.browsers" browsers] [])
29 |               args    (into args ["--" (.getPath in-file)])]
30 |           (apply util/dosh postcss "--use" "autoprefixer"
31 |                  "-o" (.getPath out-file)
32 |                  args)))
33 |       (-> fileset
34 |           (core/add-resource tmp-dir)
35 |           core/commit!))))
36 | 


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