Extract arguments from usage as objects.

t/arguable/usage.t.js

@@ -22,7 +22,16 @@ function prove (assert) {
 
     var usage = extractUsage(__filename, 'en_US', [])
     assert(usage.chooseUsage('en_US', []), message, 'usage')
-    assert(usage.getPattern([]), '-c,--config:$|-\t,--longonly:!|', 'pattern')
+    assert(usage.getPattern([]), [
+    {
+        short: 'c',
+        long: 'config',
+        arguable: true,
+    }, {
+        short: null,
+        long: 'longonly',
+        arguable: false
+    }], 'patterns')
     assert(usage.chooseUsage('en_GB', []), message, 'usage')
 
     var usage = extractUsage(path.join(__dirname, 'sub.js'), 'en_US', [])

usage.js

@@ -12,22 +12,26 @@ function Usage (language, branch, dictionary, command) {
 }
 
 Usage.prototype.getPattern = function (command) {
-    var pattern = ''
+    var patterns = []
     // Extract a definition of the command line arguments from the usage message
     // while tiding the usage message; removing special characters that are flags
     // to Arguable that do not belong in the usage message printed to `stdout`.
     this.chooseUsage(this.language, command).split(/\r?\n/).forEach(function (line) {
         var verbose, terse = '-\t', type = '!', out = '', $, trim = /^$/
         if ($ = /^(?:[\s*@]*(-[\w\d])[@\s]*,)?[@\s]*(--\w[-\w\d_]*)(?:[\s@]*[\[<]([^\]>]+)[\]>][\s@]*)?/.exec(line)) {
-            out = $[0], terse = $[1] || '-\t'
-                      , verbose = $[2]
+            out = $[0], terse = $[1] ? $[1].substring(1) : null
+                      , verbose = $[2].substring(2)
                       , type = $[3] && (numeric.test($[3]) ? '#' : '$') || '!'
                       , line = line.substring(out.length)
-            pattern +=  terse + ',' + verbose + ':' + type + '|'
+            patterns.push({
+                short: terse,
+                long: verbose,
+                arguable: type != '!'
+            })
             if (!line.length) trim = /\s+$/
         }
     }, this)
-    return pattern
+    return patterns
 }
 
 Usage.prototype.chooseUsage = function (language, command) {