Always show source code on sidebar, even if duplicate link

[mikeygough]

Motivation / Background

Browsing rubygems.org recently I found it strange that some gems show a "Source Code" link in the sidebar while others do not, even if it is set in the gemspec's source_code_uri field.

For example:

Rake does not show "Source Code"

ActiveSupport does show "Source Code"

Both gems specify a source_code_uri value in their respective gemspec files.

I dove into this and it looks like we are deduping links to declutter the sidebar.

I think this is generally a good idea but would like to propose we always show "Source Code" if it is set. Yes, users can always find the Github page for a gem by clicking the Github Star icon but it feels more intuitive to click "Source Code" if you're looking for the source code.

@etherbob Do you have a strong opinion about this? I don't want to completely revert your change but I also see that even you noted in your original PR, "There's probably also a question to be asked about gem author intent with the duplicate links and whether or not someone might get confused if they don't see a specific link to "source code" for instance if it's been superseded by the "home page" link." I think this is exactly what I'm experiencing and maybe others are as well 😅

Detail

This Pull Request modifies the unique_links method implementation to remove duplicate links but always include source_code_uri.

I decided to change the unique_links method to preserve most of the existing behavior. Given that I'm introducing a uniqueness exception to source_code_uri, should we rename this method? It is still removing duplicate links so maybe it's fine but value others' opinions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.46%. Comparing base (bb5e82b) to head (1f163fd).
⚠️ Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6118      +/-   ##
==========================================
- Coverage   97.24%   94.46%   -2.78%     
==========================================
  Files         476      476              
  Lines        9785     9851      +66     
==========================================
- Hits         9515     9306     -209     
- Misses        270      545     +275     

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[jenshenny]

This change makes sense to me

[jenshenny]

Suggested change

	metadata = { "homepage_uri" => "https://example.com", "source_code_uri" => "https://example.com" }
	metadata = { "homepage_uri" => "https://example.code", "source_code_uri" => "https://example.code" }

I think you mean this?

[jenshenny]

This is slightly confusing to me since there's a lot of booleans and conditionals, how about this?

Have REQUIRED_INDEXED_LINK_KEYS

Suggested change

	seen_urls = {}
	links.select do |short, long|
	url = send(long)
	# always include 'code' (source_code_uri) even if URL is duplicate
	if short == "code"
	true
	elsif seen_urls[url]
	false
	else
	seen_urls[url] = true
	true
	end
	unique_links = links.uniq do |_short, long|
	send(long)
	end.to_h
	# always include certain URLs even if URL is a duplicate
	links.select do |short, _long|
	unique_links.key?(short) || REQUIRED_INDEXED_LINK_KEYS.include?(short)
	end