v0.131.0 Permalinks tokens break previous behavior

[MichaelSasser]

Permalinks tokens are extremely useful, and I had a couple of places, they would be beneficial. Tere is currently just one issue. They break most of my page.

Error: error building site: render: error expanding "/wiki/Foo:Bar_Baz": permalink ill-formed

Instead of running a full-blown wiki, we went with doing that in hugo. To get roughly the same behavior as Wikipedia would, I used the same URL style. This includes colons in the URL.

Since I couldn't find anything where I could transform the title into it, I added url to every wiki page like the following.

# without whitespace
title: "Help:Infobox"
url: "/wiki/Help:Infobox"

# with whitespace 
title: "Foo:Bar Baz"
url: "/wiki/Foo:Bar_Baz" 

# with whitespace but without colons 
title: "Foo Bar"
url: "/wiki/Foo_Bar" 

# without whitespace but without colons 
title: "Foo"
url: "/wiki/Foo" 

Because I was unable to find any workarounds and I consider the wiki URL to be a key feature, I can't upgrade to >= v0.131.0.

Would it be possible to add something like a raw url feature to hugo that behaves like url did prior to v0.131.0?
Alternatively, if that use case would be interesting for others, something like a :wikititle permalink token, that would replicate the behavior I'm looking for (e.g. do the same as :title would, but replace whitespace with underscores and keep the letter case)?

What version of Hugo are you using (hugo version)?

$ hugo version
hugo v0.135.0+extended linux/amd64 BuildDate=unknown

Does this issue reproduce with the latest release?

Yes

[bep]

Error: error building site: render: error expanding "/wiki/Foo:Bar_Baz": permalink ill-formed

As I see it, there are (at least) 2 issues here:

1. We should not not throw an error when we find tokens we don't know about.
2. But even with that there would be potential ambiguity in your setup (e.g. /wiki/Foo:slug)

Hmm ...

I see 3 options ...

1. New rawurl:
2. Add a way to escape colons in url, e.g. url: "/wiki/Foo\:Bar_Baz"
3. Add a new permalinks keyword, e.g. :wikititle.

I'm not a fan of 1) and we should probably do 2) even if we also do 3), so I guess we can start with that as a fix + improving the parsing and error message...

[MichaelSasser]

LGTM

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