[RFC] Functional enhancement of the --single-update option

[Shigio YAMAGUCHI]

I would like to extend the --single-update option of gtags(1)
so that we can treat the case of addition too.

[Current]
$ gtags
$ cp main.c main2.c                             # new file
$ gtags --single-update=main2.c
gtags: 'main2.c' not found.                     # Error
$ _

[New]
$ gtags
$ cp main.c main2.c                             # new file
$ gtags --single-update=main2.c
$ _                                             # Success

Since this function is upward compatible,
there is no problem, I think.

Any problem?
--
Shigio YAMAGUCHI <address@hidden>
PGP fingerprint: D1CB 0B89 B346 4AB6 5663  C4B6 3CA5 BBB3 57BE DDA3