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Adjust assorted hint messages that list all valid options.

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Instead of listing all valid options, we now try to provide one
that looks similar.  Since this may be useful elsewhere, this
change introduces a new set of functions that can be reused for
similar purposes.

Author: Nathan Bossart <nathandbossart@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/b1f9f399-3a1a-b554-283f-4ae7f34608e2@enterprisedb.com
This commit is contained in:
Peter Eisentraut
2022-09-16 14:51:47 +02:00
parent 1e08576691
commit 5ac51c8c9e
10 changed files with 159 additions and 47 deletions
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27
contrib/dblink/dblink.c
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@ -2008,27 +2008,32 @@ dblink_fdw_validator(PG_FUNCTION_ARGS)
{
/*
* Unknown option, or invalid option for the context specified, so
* complain about it. Provide a hint with list of valid options
* for the context.
* complain about it. Provide a hint with a valid option that
* looks similar, if there is one.
*/
StringInfoData buf;
const PQconninfoOption *opt;
const char *closest_match;
ClosestMatchState match_state;
bool has_valid_options = false;
initStringInfo(&buf);
initClosestMatch(&match_state, def->defname, 4);
for (opt = options; opt->keyword; opt++)
{
if (is_valid_dblink_option(options, opt->keyword, context))
appendStringInfo(&buf, "%s%s",
(buf.len > 0) ? ", " : "",
opt->keyword);
{
has_valid_options = true;
updateClosestMatch(&match_state, opt->keyword);
}
}
closest_match = getClosestMatch(&match_state);
ereport(ERROR,
(errcode(ERRCODE_FDW_OPTION_NAME_NOT_FOUND),
errmsg("invalid option \"%s\"", def->defname),
buf.len > 0
? errhint("Valid options in this context are: %s",
buf.data)
: errhint("There are no valid options in this context.")));
has_valid_options ? closest_match ?
errhint("Perhaps you meant the option \"%s\".",
closest_match) : 0 :
errhint("There are no valid options in this context.")));
}
}