Fix breakage of "\pset format latex".

Commit eaf746a5b unintentionally made psql's "latex" output format
inaccessible, since not only "latex" but all abbreviations of it
were considered ambiguous against "latex-longtable".  Let's go
back to the longstanding behavior that all shortened versions
mean "latex", and you have to write at least "latex-" to get
"latex-longtable".  This leaves the only difference from pre-v12
behavior being that "\pset format a" is considered ambiguous.

The fact that the regression tests didn't expose this is pretty bad,
but fixing it is material for a separate commit.

Discussion: https://postgr.es/m/cb7e1caf-3ea6-450d-af28-f524903a030c@manitou-mail.org

diff --git a/src/bin/psql/command.c b/src/bin/psql/command.c
index ee88e1ca5cff0a72185301291415025682dba4e7..13d4c5792f3635f595a626464295999cbf0f05d3 100644 (file)
--- a/src/bin/psql/command.c
+++ b/src/bin/psql/command.c
@@ -3698,7 +3698,6 @@ do_pset(const char *param, const char *value, printQueryOpt *popt, bool quiet)
                        {"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}
@@ -3725,13 +3724,22 @@ do_pset(const char *param, const char *value, printQueryOpt *popt, bool quiet)
                                        }
                                }
                        }
-                       if (match_pos < 0)
+                       if (match_pos >= 0)
+                               popt->topt.format = formats[match_pos].number;
+                       else if (pg_strncasecmp("latex-longtable", value, vallen) == 0)
+                       {
+                               /*
+                                * We must treat latex-longtable specially because latex is a
+                                * prefix of it; if both were in the table above, we'd think
+                                * "latex" is ambiguous.
+                                */
+                               popt->topt.format = PRINT_LATEX_LONGTABLE;
+                       }
+                       else
                        {
                                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;
                }
        }