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Make psql's "\pset format" command reject non-unique abbreviations.

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The previous behavior of preferring the oldest match had the advantage
of not breaking existing scripts when we add a conflicting format name;
but that behavior was undocumented and fragile (it seems just luck that
commit add9182e5 didn't break it).  Let's go over to the less mistake-
prone approach of complaining when there are multiple matches.

Since this is a small compatibility break, no back-patch.

Daniel Vérité

Discussion: https://postgr.es/m/cb7e1caf-3ea6-450d-af28-f524903a030c@manitou-mail.org
This commit is contained in:
Tom Lane 2018-11-14 16:39:59 -05:00
parent 51eaaafb85
commit eaf746a5b8
1 changed files with 41 additions and 18 deletions
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55
src/bin/psql/command.c
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@ -3637,29 +3637,52 @@ do_pset(const char *param, const char *value, printQueryOpt *popt, bool quiet)
/* set format */
if (strcmp(param, "format") == 0)
{
static const struct fmt
{
const char *name;
enum printFormat number;
} formats[] =
{
/* remember to update error message below when adding more */
{"aligned", PRINT_ALIGNED},
{"asciidoc", PRINT_ASCIIDOC},
{"html", PRINT_HTML},
{"latex", PRINT_LATEX},
{"latex-longtable", PRINT_LATEX_LONGTABLE},
{"troff-ms", PRINT_TROFF_MS},
{"unaligned", PRINT_UNALIGNED},
{"wrapped", PRINT_WRAPPED}
};
if (!value)
;
else if (pg_strncasecmp("aligned", value, vallen) == 0)
popt->topt.format = PRINT_ALIGNED;
else if (pg_strncasecmp("asciidoc", value, vallen) == 0)
popt->topt.format = PRINT_ASCIIDOC;
else if (pg_strncasecmp("html", value, vallen) == 0)
popt->topt.format = PRINT_HTML;
else if (pg_strncasecmp("latex", value, vallen) == 0)
popt->topt.format = PRINT_LATEX;
else if (pg_strncasecmp("latex-longtable", value, vallen) == 0)
popt->topt.format = PRINT_LATEX_LONGTABLE;
else if (pg_strncasecmp("troff-ms", value, vallen) == 0)
popt->topt.format = PRINT_TROFF_MS;
else if (pg_strncasecmp("unaligned", value, vallen) == 0)
popt->topt.format = PRINT_UNALIGNED;
else if (pg_strncasecmp("wrapped", value, vallen) == 0)
popt->topt.format = PRINT_WRAPPED;
else
{
int match_pos = -1;
for (int i = 0; i < lengthof(formats); i++)
{
if (pg_strncasecmp(formats[i].name, value, vallen) == 0)
{
if (match_pos < 0)
match_pos = i;
else
{
psql_error("\\pset: ambiguous abbreviation \"%s\" matches both \"%s\" and \"%s\"\n",
value,
formats[match_pos].name, formats[i].name);
return false;
}
}
}
if (match_pos < 0)
{
psql_error("\\pset: allowed formats are aligned, asciidoc, html, latex, latex-longtable, troff-ms, unaligned, wrapped\n");
return false;
}
else
popt->topt.format = formats[match_pos].number;
}
}
/* set table line style */