Implement source selector (part 2)

[quambene]

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[codecov]

Codecov Report

Attention: Patch coverage is 88.53755% with 58 lines in your changes are missing coverage. Please review.

Project coverage is 91.09%. Comparing base (38abcdb) to head (748f0c5).

Files	Patch %	Lines
src/cmd/import.rs	27.27%	16 Missing ⚠️
src/bookmarks/mod.rs	80.30%	13 Missing ⚠️
src/test_utils.rs	87.87%	12 Missing ⚠️
src/bookmarks/bookmark_processor.rs	61.90%	8 Missing ⚠️
src/args.rs	0.00%	3 Missing ⚠️
src/cmd/fetch.rs	93.54%	2 Missing ⚠️
src/cmd/init.rs	91.30%	2 Missing ⚠️
src/cmd/update.rs	87.50%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #76      +/-   ##
==========================================
+ Coverage   91.07%   91.09%   +0.01%     
==========================================
  Files          36       36              
  Lines        5919     6233     +314     
==========================================
+ Hits         5391     5678     +287     
- Misses        528      555      +27     

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