Plan for Onigmo 6.0

[k-takata]

About one year ago Oniguruma restarted on GitHub, and Oniguruma 6.0 was released about five months ago. Unfortunately new syntax I implemented in Onigmo like \K, \X and etc. were not merged in Oniguruma, and I don't think K.Kosako is going to merge them.
I think Ongimo and Oniguruma are now diverged and won't be merged again.

Currently Onigmo and Oniguruma cannot be installed in the same system, because Onigmo still uses the same header/library filenames. They should be changed now.

I'm planing that:

• Rename the header and library filenames: onigmo.h, libonigmo.so, onigmo.dll, etc.
• Import the latest Ruby's source code. This includes support for Unicode 9.0 and improvement of case folding. (Already merged into the ruby-2.x branch.)
• Merge the ruby-2.x branch into master. Ruby specific codes should be surrounded by #ifdef RUBY.
• Change some APIs. (Some of them come from the side effect of merging the ruby-2.x branch.)
  • Encoding structs and syntax structs will become const.
  • Change some encoding name. E.g. ONIG_ENCODING_UTF8 -> ONIG_ENCODING_UTF_8. However the old names still can be used, because I will define aliases for backward compatibility. (But the old structure names like OnigEncodingUTF8 will not be used. They are not considered as a part of public API.)
  • (Import Oniguruma 6.x's new APIs?)
    • onig_scan: Maybe useful and easy to import.
    • onig_unicode_define_user_property: Not sure how this is useful.
    • onig_initialize: Not sure why this is needed. Related to thread safe?
• (Make Onigmo thread safe and remove all THREAD_* macros like Oniguruma did?)
• Merge bug fixes done in Oniguruma 6.x. Need to check if they are already fixed in Onigmo.

[k-takata]

onig_unicode_define_user_property: Not sure how this is useful.

I have decided to skip this in Onigmo 6.0.
I wonder why this API is limited to Unicode encodings only.

[k-takata]

Onigmo 6.0.0 has been released: https://github.com/k-takata/Onigmo/releases/tag/Onigmo-6.0.0
Closing.