|From:||Auto mailings of changes to Lily Issues via Testlilyissues-auto|
|Subject:||[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #4326 Enhancement: simplify accepting a new custom context like an existing context|
|Date:||Sun, 22 Mar 2020 17:41:47 -0000|
Closing. See issue 4561.
[issues:#4326] Enhancement: simplify accepting a new custom context like an existing context
Created: Mon Mar 16, 2015 10:39 AM UTC by Anonymous
Last Updated: Wed Sep 20, 2017 08:21 AM UTC
Originally created by: *anonymous
From Paul Morris:
Use \alias for determining what contexts accept other contexts (and not just
for allowing commands accepted in one context to be used in another context).
“...it would be nice, if it is practical, for "Higher" contexts to decide to
accept "Lower" contexts based on context name (\ChordNames) as well as on alias
A would accept C because A accepts B, and C is explicitly
declared as an alias of B. Therefore, A would accept B and all
aliases of B.”
"Most of the time if we want commands that work in X to work in Y (by using
\alias X), we also want Y to be accepted wherever X is accepted.
So when Z is determining whether to accept a new context Y... have it first
check Y's name, and if the name is unknown (not in its "accepts" list) then
have it check Y's alias (\alias X). If the alias X is in the "accepts" list,
then Z would accept Y.
In rare cases where we didn't want these things coupled (where we wanted
commands from X to work in Y, but we didn't want Y to be accepted wherever X is
accepted), then we could use \denies and \accepts to define exactly where we
want Y to be accepted or denied.
This would really simplify the process of creating custom contexts, especially
in the common case of wanting a modified version of an existing context that
works everywhere it does.”
See full discussion thread here:
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