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1 ; Copyright (c) Chris Houser, Nov-Dec 2008. All rights reserved.
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2 ; The use and distribution terms for this software are covered by the
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3 ; Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
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4 ; which can be found in the file epl-v10.html at the root of this distribution.
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5 ; By using this software in any fashion, you are agreeing to be bound by
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6 ; the terms of this license.
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7 ; You must not remove this notice, or any other, from this software.
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8
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9 ; Process command-line arguments according to a given cmdspec
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10
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11 (ns
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12 ^{:author "Chris Houser",
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13 :doc "Process command-line arguments according to a given cmdspec"}
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14 clojure.contrib.command-line
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15 (:use (clojure.contrib [string :only (join)])))
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16
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17 (defn make-map [args cmdspec]
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18 (let [{spec true [rest-sym] false} (group-by vector? cmdspec)
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19 rest-str (str rest-sym)
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20 key-data (into {} (for [[syms [_ default]] (map #(split-with symbol? %)
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21 (conj spec '[help? h?]))
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22 sym syms]
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23 [(re-find #"^.*[^?]" (str sym))
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24 {:sym (str (first syms)) :default default}]))
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25 defaults (into {} (for [[_ {:keys [default sym]}] key-data
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26 :when default]
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27 [sym default]))]
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28 (loop [[argkey & [argval :as r]] args
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29 cmdmap (assoc defaults :cmdspec cmdspec rest-str [])]
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30 (if argkey
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31 (let [[_ & [keybase]] (re-find #"^--?(.*)" argkey)]
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32 (cond
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33 (= keybase nil) (recur r (update-in cmdmap [rest-str] conj argkey))
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34 (= keybase "") (update-in cmdmap [rest-str] #(apply conj % r))
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35 :else (if-let [found (key-data keybase)]
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36 (if (= \? (last (:sym found)))
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37 (recur r (assoc cmdmap (:sym found) true))
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38 (recur (next r) (assoc cmdmap (:sym found)
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39 (if (or (nil? r) (= \- (ffirst r)))
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40 (:default found)
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41 (first r)))))
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42 (throw (Exception. (str "Unknown option " argkey))))))
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43 cmdmap))))
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44
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45 (defn- align
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46 "Align strings given as vectors of columns, with first vector
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47 specifying right or left alignment (:r or :l) for each column."
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48 [spec & rows]
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49 (let [maxes (vec (for [n (range (count (first rows)))]
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50 (apply max (map (comp count #(nth % n)) rows))))
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51 fmt (join " "
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52 (for [n (range (count maxes))]
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53 (str "%"
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54 (when-not (zero? (maxes n))
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55 (str (when (= (spec n) :l) "-") (maxes n)))
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56 "s")))]
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57 (join "\n"
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58 (for [row rows]
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59 (apply format fmt row)))))
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60
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61 (defn- rmv-q
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62 "Remove ?"
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63 [^String s]
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64 (if (.endsWith s "?")
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65 (.substring s 0 (dec (count s)))
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66 s))
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67
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68 (defn print-help [desc cmdmap]
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69 (println desc)
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70 (println "Options")
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71 (println
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72 (apply align [:l :l :l]
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73 (for [spec (:cmdspec cmdmap) :when (vector? spec)]
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74 (let [[argnames [text default]] (split-with symbol? spec)
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75 [_ opt q] (re-find #"^(.*[^?])(\??)$"
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76 (str (first argnames)))
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77 argnames (map (comp rmv-q str) argnames)
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78 argnames
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79 (join ", "
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80 (for [arg argnames]
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81 (if (= 1 (count arg))
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82 (str "-" arg)
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83 (str "--" arg))))]
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84 [(str " " argnames (when (= "" q) " <arg>") " ")
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85 text
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86 (if-not default
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87 ""
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88 (str " [default " default "]"))])))))
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89
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90 (defmacro with-command-line
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91 "Bind locals to command-line args."
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92 [args desc cmdspec & body]
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93 (let [locals (vec (for [spec cmdspec]
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94 (if (vector? spec)
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95 (first spec)
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96 spec)))]
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97 `(let [{:strs ~locals :as cmdmap#} (make-map ~args '~cmdspec)]
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98 (if (cmdmap# "help?")
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99 (print-help ~desc cmdmap#)
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100 (do ~@body)))))
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101
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102 (comment
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103
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104 ; example of usage:
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105
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106 (with-command-line *command-line-args*
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107 "tojs -- Compile ClojureScript to JavaScript"
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108 [[simple? s? "Runs some simple built-in tests"]
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109 [serve "Starts a repl server on the given port" 8081]
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110 [mkboot? "Generates a boot.js file"]
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111 [verbose? v? "Includes extra fn names and comments in js"]
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112 filenames]
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113 (binding [*debug-fn-names* verbose? *debug-comments* verbose?]
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114 (cond
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115 simple? (simple-tests)
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116 serve (start-server (Integer/parseInt serve))
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117 mkboot? (mkboot)
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118 :else (doseq [filename filenames]
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119 (filetojs filename)))))
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120
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121 )
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