https://bz.mercurial-scm.org/show_bug.cgi?id=6014
Bug ID: 6014
Summary: hg showconfig --give-me-default-value and
--give-me-current-value-even-if-it-is-the-default
Product: Mercurial
Version: unspecified
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: feature
Priority: wish
Component: Mercurial
Assignee: bugzi...@mercurial-scm.org
Reporter: a...@dwimlabs.net
CC: mercurial-devel@mercurial-scm.org
Looking at such tools as postconf (postfix) and doveconf (dovecot) and
comparing how they work with hg showconfig, one flaw in the latter is obvious:
it cannot be reliably used to just get the current setting. For example, when
user doesn't set ui.color anywhere in config files, the default value for it is
'auto' (configitems.py). But `hg showconfig ui.color` outputs nothing, IOW an
empty string, and not 'auto'.
If a script (e.g. shell prompt or completion file) decides to peek at certain
config values (they don't have to be related to color, of course), it will need
to know to substitute empty results from `hg showconfig` for a default value...
and there's also no way to get that default value lest it parses
mercurial/configitems.py.
What do the config tools from postfix and dovecot do then? Here are some flags
from their man pages:
> postconf: -d print default parameter settings instead of actual settings
> -n Show only configuration parameters that have explicit
> name=value settings
> doveconf: -n Show only settings with non-default values. [*]
Maybe showconfig could grow similar flags (names bikesheddable): -d/--default
to print default value and -a/--any for any value, including default. Or maybe
it's worth a BC to make `hg showconfig foo` print value of foo even if it's not
configured anywhere explicitly.
[*] doveconf is actually used to parse config files and feed the results to the
rest of the dovecot system, so printing all possible key=value by default pairs
makes perfect sense. Not the case of hg showconfig, but still.
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