* bug#26910: 26.0.50; Enhancement request: type-checking in customize-set-variable
@ 2017-05-13 9:22 N. Raghavendra
2017-05-13 17:50 ` Drew Adams
0 siblings, 1 reply; 2+ messages in thread
From: N. Raghavendra @ 2017-05-13 9:22 UTC (permalink / raw)
To: 26910
I would like a way to set options using Emacs Lisp directly (without
interacting with customization buffers), which ensures that the :set and
:type specifications of the options are respected. Evaluating
(customize-set-variable OPTION VALUE)
uses the :set property of OPTION, but doesn't check that VALUE has the
type specified in the
(defcustom OPTION ...)
expression.
I request the addition of an optional argument to customize-set-variable,
so that, e.g.,
(customize-set-variable OPTION VALUE "This is a comment." t)
generates an error if VALUE is not of the type specified by
(defcustom OPTION ...),
and otherwise does everything that
(customize-set-variable OPTION VALUE "This is a comment.")
does now. I also request a similar addition to `custom-set-variables'.
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In GNU Emacs 26.0.50.1 (x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
of 2017-01-22 built on ailuros
Repository revision: 0a49f158f1598fb92989f3cbdc238a7e5f1bd8a3
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description: Linux Mint 18.1 Serena
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(floats 8 728 400)
(intervals 56 923 8)
(buffers 976 25)
(heap 1024 71343 2610))
--
N. Raghavendra <raghu@hri.res.in>, http://www.retrotexts.net/
Harish-Chandra Research Institute, http://www.hri.res.in/
^ permalink raw reply [flat|nested] 2+ messages in thread
* bug#26910: 26.0.50; Enhancement request: type-checking in customize-set-variable
2017-05-13 9:22 bug#26910: 26.0.50; Enhancement request: type-checking in customize-set-variable N. Raghavendra
@ 2017-05-13 17:50 ` Drew Adams
0 siblings, 0 replies; 2+ messages in thread
From: Drew Adams @ 2017-05-13 17:50 UTC (permalink / raw)
To: N. Raghavendra, 26910
> I request the addition of an optional argument to
> customize-set-variable, so that, e.g.,
> (customize-set-variable OPTION VALUE "This is a comment." t)
> generates an error if VALUE is not of the type specified by
> (defcustom OPTION ...),
+1
Should it raise an error or just show a message and be ignored
(not set the value)?
How about having the new optional argument specify the behavior?
Non-nil means type-check. The particular non-nil value:
* `no-error' means if type-check fails just show a message (and
do not set value).
* any other non-nil value means raise an error
(defun customize-set-variable (variable value &optional comment type-checking)
"...
Non-nil optional arg TYPE-CHECKING means type-check VALUE and
set the option value only if the type is appropriate.
If TYPE-CHECKING is `no-error' then display a message about the
incorrect type, but do not raise an error. Any other non-nil
value means raise an error."
...)
> and otherwise does everything that
> (customize-set-variable OPTION VALUE "This is a comment.")
> does now.
Sounds good to me.
> I also request a similar addition to `custom-set-variables'.
I think this one is impossible, since `custom-set-variables' has
only an &rest parameter: the args are not wrapped in an explicit
list. We cannot add an optional parameter after the &rest parameter.
In addition, `custom-set-variables' accepts an _expression_,
without evaluating it (by default) for each variable. Unless
the optional NOW element is present - in that case we could
type-check the resulting value.
This also means that we would need to provide such control
separately for each variable passed to `custom-set-variables'.
We could do that by allowing NOW to take one or more special
non-nil values, to mean type-check after evaluating. Probably
we would want to allow two such special type-checking values:
If NOW is present and non-nil, then also evaluate EXP and set
the default value for the SYMBOL to the value of EXP. If NOW
is the symbol `type-check' then raise an error if the result of
evaluating EXP is not of an appropriate type. If NOW is the
symbol `type-check-no-error' then type-check the value of EXP
but just show a message, instead of raising an error, when the
value has an inappropriate type.
What about also having another function, similar to
`custom-set-variables', but which accepts an explicit list of
(SYMBOL EXP [NOW [REQUEST [COMMENT]]]) entries plus an optional
TYPE-CHECKING arg that has the effect of providing a default
type-checking behavior for all entries that have non-nil NOW.
Without non-nil arg TYPE-CHECKING it would behave just like
(apply 'custom-set-variables VARLIST), where VARLIST is the
explicit list of variable specs.
Maybe something like this:
(defun custom-set-varlist (varlist &optional type-checking)
"Invoke `custom-set-variables' on the settings in list VARLIST.
Each such setting has the form of an argument acceptable to
`custom-set-variables'.
Non-nil optional arg TYPE-CHECKING means type-check each VARLIST
entry that has a non-nil NOW element, and set the option value
only if the type is appropriate.
The value of TYPE-CHECKING determines the default type-checking
behavior: a value of `no-error' means display messages about the
incorrect types, but do not raise an error. Any other non-nil
value means raise an error.
The default type-checking behavior can be overridden for any
given variable by its NOW element. If NOW is `type-check' or
`type-check-no-error' then it overrides the value of arg
TYPE-CHECKING for that variable. If NOW is any other non-nil
value then the value of TYPE-CHECKING determines the behavior."
...)
^ permalink raw reply [flat|nested] 2+ messages in thread
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2017-05-13 9:22 bug#26910: 26.0.50; Enhancement request: type-checking in customize-set-variable N. Raghavendra
2017-05-13 17:50 ` Drew Adams
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