Adds CLI for rendering mermaid files

lib/index.js

@@ -0,0 +1,40 @@
+var os = require('os')
+  , fs = require('fs')
+  , path = require('path')
+  , spawn = require('child_process').spawn
+
+var mkdirp = require('mkdirp')
+
+var phantomscript = path.join(__dirname, 'phantomscript.js')
+
+module.exports = { process: processMermaid }
+
+function processMermaid(files, _options, _next) {
+  var options = _options || {}
+    , outputDir = options.outputDir || process.cwd()
+    , next = _next || function() {}
+    , phantomArgs = [
+          phantomscript
+        , outputDir
+        , options.png
+        , options.svg
+        , options.verbose
+      ]
+
+  files.forEach(function(file) {
+    phantomArgs.push(file)
+  })
+
+  mkdirp(outputDir, function(err) {
+    if (err) {
+      throw err
+      return
+    }
+    phantom = spawn(options.phantomPath, phantomArgs)
+
+    phantom.on('exit', next)
+
+    phantom.stderr.pipe(process.stderr)
+    phantom.stdout.pipe(process.stdout)
+  })
+}