templater: add pad/truncate functions #4672
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This could be inlined in templater implementation, but I decided to add text_util functions for ease of testing.
I'm going to add keyword arguments support to templater.
As I said in the preceding patch, I settled on separate pad/truncate functions instead of a function taking multiple optional parameters. It's less efficient to process truncation and padding independently, but I don't think that would matter. The order of arguments follows the current f(..., content) convention. We can also add a method syntax, but I'm not sure if it's useful. In order to call a method of Template type, we'll need to coerce printable object to Template: concat(author.email()).truncate_end(10).pad_end(10) ^^^^^^ String -> Template FWIW, String type could provide more efficient truncate/pad methods. Closes martinvonz#3183
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#3183
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If applicable:
CHANGELOG.md