add a debug option to astisub to output informations on a subtitle #58
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Hello!
This PR adds a "-d" option to the astisub command, which sets a bool in the option struct passed to Open().
On reading a STL file, outputs to stdout:
It is designed for the interactive human user, no concern has been given to automatic parsing of this output.
Maybe it would be a better idea to do the lines output at the end of subtitles.go:Open, so it would be common to all kinds of subtitles and not clutter stl.go.
An unoprotected global struct keeps the debug state: debug is not really meant to be enabled when using astisub as a lib.
Not sure if it's worth being incorporated in astisub, but I keep going back to that debug output when problems are signaled in our subs ;)