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(ns clojure.contrib.command-line
(:require (clojure.contrib [seq-utils :as su])))
(defn make-map [args cmdspec]
(let [{specs true [rest-name] false} (su/group-by vector? cmdspec)
names (assoc (into {} (for [[n txt d] specs] [(str n) d]))
"help?" nil)]
(loop [[argkey & [argval :as r]] args
cmdmap {:cmdspec cmdspec rest-name []}]
(if argkey
(let [[_ & [keybase]] (re-find #"^--?(.*)" argkey)]
(cond
(= keybase nil) (recur r (update-in cmdmap [rest-name] conj argkey))
(= keybase "") (update-in cmdmap [rest-name] #(apply conj % r))
(contains? names keybase)
(recur (rest r) (assoc cmdmap (symbol keybase)
(if (or (nil? r) (= \- (ffirst r)))
(names keybase)
(first r))))
(contains? names (str keybase "?"))
(recur r (assoc cmdmap (symbol (str keybase "?")) true))
:else (throw (Exception. (str "Unknown option " argkey)))))
cmdmap))))
(defn print-help [desc cmdmap]
(println desc "\n")
(doseq spec (:cmdspec cmdmap)
(when (vector? spec)
(let [[argname text default] spec]
(println (format "--%-10s %s"
(let [[_ opt q] (re-find #"^(.*[^?])(\??)$"
(str argname))]
(str opt (when (= "" q) " x")))
(str text (when default
(str " [default " default "]")))))))))
(defmacro with-command-line [args desc cmdspec & body]
"Bind locals to command-line args."
(let [locals (vec (for [spec cmdspec]
(if (vector? spec)
(first spec)
spec)))]
`(let [{:syms ~locals :as cmdmap#} (make-map ~args '~cmdspec)]
(if (cmdmap# '~'help?)
(print-help ~desc cmdmap#)
(do ~@body)))))
(comment
; example of usage:
(with-command-line *command-line-args*
"tojs -- Compile ClojureScript to JavaScript"
[[simple? "Runs some simple built-in tests"]
[serve "Starts a repl server on the given port" 8081]
[mkboot? "Generates a boot.js file"]
[v? "Includes extra fn names and comments in js"]
filenames]
(binding [*debug-fn-names* v? *debug-comments* v?]
(cond
simple? (simple-tests)
serve (start-server (Integer/parseInt serve))
mkboot? (mkboot)
:else (doseq filename filenames
(filetojs filename)))))
)
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