Add hyperlinks to accounts and dates in HTML and FODS export

[thielema]

This adds the option --anchor to hledger-cli. If the user passes this option, then in HTML and FODS output the account and date header cells become hyperlinks to hledger-web.
If you like this feature, I add some documentation.
I could also rename the option to --base-url for consistency with hledger-web.
There is a problem though. Some special characters like + or umlauts in account names are not correctly escaped in percent URL syntax by Lucid. I do not know how to solve this correctly with Lucid and whether it is solvable with Lucid, at all.

[thielema]

The feature could also be used in hledger-web. That is, in hledger-web there could be hyperlinks to auto-generated multi-balance HTML's, that link back to hledger-web.

[simonmichael]

Interesting feature!

--base-url sounds good. I assume its value will be the same as what hledger-web prints at startup ? Eg

...
with base url http://127.0.0.1:5000
...

I don't know the url escaping function offhand but it sounds resolvable. Maybe there's ideas in hledger-web.

The reverse feature (linking to static HTML reports) could be a separate PR. I'd like to have multi-period tabular reports as a normal view in hledger-web, but linking to static html reports saved in temporary files, or better, serving the static html generated in memory, might be easier.

[thielema]

On Thu, 12 Sep 2024, Simon Michael wrote: Interesting feature! --base-url sounds good. I assume its value will be the same as what hledger-web prints at startup ? Eg ... with base url http://127.0.0.1:5000 ...

I expect the trailing slash to be part of the base URL.

I don't know the url escaping function offhand but it sounds resolvable. Maybe there's ideas in hledger-web.

hledger-web generates HTML via `blaze` instead of `lucid`.

The reverse feature (linking to static HTML reports) could be a separate PR.

of course

I'd like to have multi-period tabular reports as a normal view in hledger-web, but linking to static html reports saved in temporary files, or better, serving the static html generated in memory, might be easier.

Hledger.Write.Html.printHTML returns a Lucid.Html () which can be served from memory or written to a file.

[thielema]

We could also add the query from the command-line to the hyperlinks. That is, if someone restricts transactions in a certain way for the balance command, the hledger-web register page would respect these restrictions, too.