add helm-gtags-process-environment to support buffer local GTAGSLIBPATH #178
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to support setting 'GTAGSLIBPATH' base on local buffer
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hi,
Currently we have to add all tag lib path to 'GTAGSLIBPATH' in global 'process-environment' which may lead to incorrect jump if several lib path contains the same 'TAG'.
For example, I have TAG file for emacs lisp at '~/.gtags/emacs-lisp' and c include header at '~/.gtags/c'. global 'GTAGSLIBPATH' would be set to '~/.gtags/emacs-lisp:~/.gtags/c'. Both of them contain a 'sort' TAG.
if I was editing a 'test.c' file, and querying a 'sort' TAG, I will jump to 'sort' TAG from '~/.gtags/emacs-lisp' which
is wrong.
So this PR add a buffer local variable 'helm-gtags-process-environment' (just like 'ggtags-process-environment' in ggtags) to solve this problem. 'helm-gtags-process-environment' will be prepend to 'process-environment' when needed. And we could set 'GTAGSLIBPATH' to different value for different
programming language in mode hook.
Best regards.