Fix commandline handling

[zappolowski]

The output of dunst -h differs from the one of dunst --help due to how the usage string is constructed. Furthermore, the options -print and --startup_notification are not listed at all (due to incorrect ordering of options).

This PR refactors cmdline_find_option to handle more than two alternatives (which fixes the first issue, when calls to cmdline_get_* are merged) and reorders command line parsing in a way, that all currently available options are listed.

NB: I've added -startup_notification as alternative to --startup_notification as it was the only option only available with to hyphens and thus breaking consistency.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 64.28571% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.02%. Comparing base (2cd719a) to head (d844e1d).
⚠️ Report is 426 commits behind head on master.

Files with missing lines	Patch %	Lines
src/dunst.c	0.00%	5 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1208      +/-   ##
==========================================
- Coverage   66.03%   66.02%   -0.01%     
==========================================
  Files          46       46              
  Lines        7595     7584      -11     
==========================================
- Hits         5015     5007       -8     
+ Misses       2580     2577       -3     

Flag	Coverage Δ
unittests	66.02% <64.28%> (-0.01%)	⬇️

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[fwsmit]

That's a great find! It even simplifies the code :)

Could you add the new command line options to the dunst.1.pod man page?

[zappolowski]

Could you add the new command line options to the dunst.1.pod man page?

Just did ... and also fixed the spelling in the manpage for --startup-notification. Basically, I'd prefer to have it that way, but changing it would be an incompatible change.

[fwsmit]

Thanks for the improvements! This will be merged now