Add option to specify output directory.

[sundus-y]

• Added -d option on gabc, preview and ly.
• The -d option can be used to specify output directory.

[sundus-y]

Solve issue #3

[igneus]

Hi, thank you very much!

Looks good overall, but I guess you didn't try to actually execute gly preview with the new option: currently PreviewBuilder knows nothing about the non-default output directory, so it will still attempt to execute gregorio and lualatex in the default location.

If you have gregorio and lualatex installed (or can have them easily), please try and fix this. If you can't, please remove all changes related only to gly preview - it is valuable enough to have the option even only for gly gabc and gly ly for now.

[sundus-y]

@igneus I wasn't able to install gregorio and lualatex but I think I have fixed the problem. Please help me test it. If it's still broken I will remove the -d option from the gly preview command.

[igneus]

Thanks. gly preview still fails. Or better: (lua)latex executed by gly fails. The problem is latex resolves include paths relative to the "current working directory", but include paths in the main .tex document generated by gly are relative to the document location.
Preferable solution would be to run the lualatex process with "current working directory" in the output directory.

[sundus-y]

@igneus One last change, please test this and let me know if there is still a problem. I'm very hopeful this will fix it.

[sundus-y]

@igneus Did my last commit fix the issue?

[igneus]

I'm sorry, haven't got to testing it yet. But it's either fixed or there's some really tiny bit missing. I hope you won't mind if I simply merge and supply the eventual missing bit myself afterwards. Since you cannot test with the complete tooling, it would make no sense to request further changes from you. I hope to get to this in the near future.

[sundus-y]

@igneus Sounds good to me.