Convert Hanyu Pinyin with numbers to diacritics

In some situations, typing Hanyu Pinyin with proper tone marks is difficult or impossible. For example, on my Ubuntu 12.04 laptop, neither the compose key nor dead keys would work within Mnemosyne, so I resorted to typing numbers. To change those numbers to nice diacritics in the presentation layer, I wrote this tool, including a command-line executable and a Mnemosyne plugin.

The following programs are assumed to be available and on your PATH:

• make
• swipl (version 6.5.2 or up)
• zip

From the pyn2d directory, run make and follow the instructions.