Yuya Nishihara d0168199f0 templater: add general-purpose template engine for value types
This serves the role of the formatter in Mercurial, but the provided features
are rather restricted compared to mercurial.formatter. That's because both
implementation language "Rust" and jj's template language are statically typed.

The current implementation works well for simple commands like "config list -T",
but it might be not okay for "branch list -T". If we implement branch templating
by using the generic mechanism, the commit summary part would have to be
evaluated as a separate template:

  -T 'branch_name ++ target_commit_summary' (target_commit_summary: Template)

instead of

  -T 'branch_name ++ commit_summary(target_commit)' (target_commit: Commit)

where the branch template language is a superset of the commit template
language.
2024-03-06 11:38:57 +09:00
..