correctly flatten command with line continuation when copying

Author: mojavelinux

src/js/06-copy-to-clipboard.js

@@ -44,10 +44,10 @@
 
   function extractCommands (text) {
     var cmdRx = /^\$ (\S[^\\\n]*(\\\n(?!\$ )[^\\\n]*)*)(?=\n|$)/gm
-    var cleanupRx = /( )? *\\\n */g
+    var cleanupRx = /( ) *\\\n *|\\\n( ?) */g
     var cmds = []
     var m
-    while ((m = cmdRx.exec(text))) cmds.push(m[1].replace(cleanupRx, '$1'))
+    while ((m = cmdRx.exec(text))) cmds.push(m[1].replace(cleanupRx, '$1$2'))
     return cmds.join(' && ')
   }