* bug#5183: 23.1; doc for `font-lock-extra-managed-props'
@ 2009-12-11 17:54 Drew Adams
2009-12-11 18:37 ` Drew Adams
2016-04-27 20:23 ` Lars Ingebrigtsen
0 siblings, 2 replies; 3+ messages in thread
From: Drew Adams @ 2009-12-11 17:54 UTC (permalink / raw
To: bug-gnu-emacs
It is not clear from the doc what this variable does or how it works.
The doc string says:
"Additional text properties managed by font-lock.
This is used by `font-lock-default-unfontify-region' to decide
what properties to clear before refontifying a region."
This speaks only of clearing the properties. It says nothing about how
(re-)fontifying works for such extra properties.
The elisp manual says only this:
"This variable specifies additional properties (other than
`font-lock-face') that are being managed by Font Lock mode. It is
used by `font-lock-default-unfontify-region', which normally only
manages the `font-lock-face' property. If you want Font Lock to
manage other properties as well, you must specify them in a
FACESPEC in `font-lock-keywords' as well as add them to this list.
*Note Search-based Fontification::."
Again, the only thing explained is that unfontifying will remove these
properties (along with property `font-lock-face'). There is no real
explanation of how to use this variable wrt fontifying.
And the cross reference doesn't seem to help at all. Node
`Search-based Fontification' does not say anything (that I can find)
about `font-lock-extra-managed-props' or how to make font lock "manage
other properties".
The doc string of `font-lock-keywords' comes the closest to explaining
how to use this variable, as a side note to this paragraph:
"FACENAME is an expression whose value is the face name to use.
Instead of a face, FACENAME can evaluate to a property list of the
form (face FACE PROP1 VAL1 PROP2 VAL2 ...) in which case all the
listed text-properties will be set rather than just FACE. In such a
case, you will most likely want to put those properties in
`font-lock-extra-managed-props' or to override
`font-lock-unfontify-region-function'."
The only place in the Emacs Lisp source code where this variable is
used, besides font-lock.el, is in compile.el. The use there is
somewhat complex, but it seems to be this:
1. `compilation-mode-font-lock-keywords' adds extra properties
(directory message help-echo mouse-face debug) to
`font-lock-keywords', via `compilation-directory-properties'.
2. `font-lock-extra-managed-props' is set to those same properties, so
they will be removed via `font-lock-default-unfontify-region'.
Please explain in the elisp manual how this variable can actually be
used to "manage other properties". Consider adding a simple example -
e.g. a simpler version of what is done in compile.el.
In GNU Emacs 23.1.1 (i386-mingw-nt5.1.2600)
of 2009-07-29 on SOFT-MJASON
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (4.4)'
^ permalink raw reply [flat|nested] 3+ messages in thread
* bug#5183: 23.1; doc for `font-lock-extra-managed-props'
2009-12-11 17:54 bug#5183: 23.1; doc for `font-lock-extra-managed-props' Drew Adams
@ 2009-12-11 18:37 ` Drew Adams
2016-04-27 20:23 ` Lars Ingebrigtsen
1 sibling, 0 replies; 3+ messages in thread
From: Drew Adams @ 2009-12-11 18:37 UTC (permalink / raw
To: 5183, bug-gnu-emacs
> The only place in the Emacs Lisp source code where this variable is
> used, besides font-lock.el, is in compile.el.
Actually, it is used also in scheme.el and bibtex.el.
Perhaps scheme.el offers a better example of use?
^ permalink raw reply [flat|nested] 3+ messages in thread
* bug#5183: 23.1; doc for `font-lock-extra-managed-props'
2009-12-11 17:54 bug#5183: 23.1; doc for `font-lock-extra-managed-props' Drew Adams
2009-12-11 18:37 ` Drew Adams
@ 2016-04-27 20:23 ` Lars Ingebrigtsen
1 sibling, 0 replies; 3+ messages in thread
From: Lars Ingebrigtsen @ 2016-04-27 20:23 UTC (permalink / raw
To: Drew Adams; +Cc: 5183
"Drew Adams" <drew.adams@oracle.com> writes:
> It is not clear from the doc what this variable does or how it works.
> The doc string says:
>
> "Additional text properties managed by font-lock.
> This is used by `font-lock-default-unfontify-region' to decide
> what properties to clear before refontifying a region."
>
> This speaks only of clearing the properties. It says nothing about how
> (re-)fontifying works for such extra properties.
I think it's pretty clear: These are the font properties that are
managed (i.e., cleared and set as font-lock decides), and that you can't
rely on being preserved if you set them yourself...
So I don't quite understand what you don't understand here. :-)
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
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2009-12-11 17:54 bug#5183: 23.1; doc for `font-lock-extra-managed-props' Drew Adams
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2016-04-27 20:23 ` Lars Ingebrigtsen
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