Complete generator for ebooks

1 files changed, 21 insertions, 1 deletions

diff --git a/lib/utils/command.js b/lib/utils/command.js
index c3e33c7..49b0998 100644
--- a/lib/utils/command.js
+++ b/lib/utils/command.js
@@ -1,3 +1,4 @@
+var _ = require('lodash');
 var childProcess = require('child_process');
 var Promise = require('./promise');
 
@@ -37,8 +38,27 @@ function spawn(command, args, options) {
     return d.promise;
 }
 
+// Transform an option object to a command line string
+function escapeShellArg(s) {
+    s = s.replace(/"/g, '\\"');
+    return '"' + s + '"';
+}
+
+function optionsToShellArgs(options) {
+    return _.chain(options)
+    .map(function(value, key) {
+        if (value === null || value === undefined || value === false) return null;
+        if (value === true) return key;
+        return key + '=' + escapeShellArg(value);
+    })
+    .compact()
+    .value()
+    .join(' ');
+}
+
 module.exports = {
     isAvailable: isAvailable,
     exec: exec,
-    spawn: spawn
+    spawn: spawn,
+    optionsToShellArgs: optionsToShellArgs
 };