CLJS-2652: Line breaks in long options for compile

This patch prevents line-breaking in the middle of long-form option
descriptions by treating long-form options as single tokens, instead
of considering `--` as its own token.

Running `cljs --help` without this patch would produce output looking
like (notice the line-break between `--` and `compile`:

  * Set optimization level, only effective with --
    compile main option. Valid values are: none,
    whitespace, simple, advanced

With this patch, the output looks like:

  * Set optimization level, only effective with
    --compile main option. Valid values are: none,
    whitespace, simple, advanced

Author: SahilKang

src/main/clojure/cljs/cli.clj

@@ -60,9 +60,11 @@ classpath. Classpath-relative paths have prefix of @ or @/")
          (let [w (.substring ws s e)
                word-len (.length w)
                line-len (+ line-len word-len)]
-           (if (> line-len max-len)
-             (recur e (.next b) word-len w (conj ret line))
-             (recur e (.next b) line-len (str line w) ret)))
+           (if (= w "--") ; long-form options are single tokens (i.e. --repl)
+             (recur s (.next b) (- line-len 2) line ret)
+             (if (> line-len max-len)
+               (recur e (.next b) word-len w (conj ret line))
+               (recur e (.next b) line-len (str line w) ret))))
          (conj ret (str line (.substring ws s (.length ws)))))))))
 
 (defn- opt->str [cs {:keys [arg doc]}]