x/pkgsite: add a 'y' keyboard shortcut to canonicalise URL with version

[myitcv]

What is the URL of the page with the issue?

https://pkg.go.dev/github.com/govim/govim/cmd/govim/config?tab=doc

What is your user agent?

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.66 Safari/537.36

Screenshot

What did you do?

Navigated to said page.

What did you expect to see?

On GitHub, the y keyboard shortcut allows the viewer to canonicalise the URL for the version of a file you are viewing:

For example, at the time of writing, hitting y whilst on:

https://github.com/govim/govim/blob/master/cmd/govim/config/config.go

updates the address bar URL to be:

https://github.com/govim/govim/blob/013f992e25f23cbc4a778d1eb472e719d276de32/cmd/govim/config/config.go

I think a similar option should be offered on pkg.go.dev. For example, at the time of writing, hitting y whilst on:

https://pkg.go.dev/github.com/govim/govim/cmd/govim/config?tab=doc

would update the address bar URL to be:

https://pkg.go.dev/github.com/govim/govim@v0.0.27/cmd/govim/config?tab=doc

What did you see instead?

No option to do this.

[kush-patel-hs]

I'll like to take this on

[kush-patel-hs]

Ready for review https://go-review.googlesource.com/c/pkgsite/+/239179!. I used GIthub's behaviour of the URL update does not reload page (it simply replaces history).

[gopherbot]

Change https://golang.org/cl/239179 mentions this issue: content/static,internal/frontend: add 'y' keyboard shortcut to canonicalise URL with version