Re: Feature: psql - display current search_path in prompt

From: Nathan Bossart <nathandbossart(at)gmail(dot)com>
To: Florents Tselai <florents(dot)tselai(at)gmail(dot)com>
Cc: Jim Jones <jim(dot)jones(at)uni-muenster(dot)de>, Jelte Fennema-Nio <postgres(at)jeltef(dot)nl>, Lauri Siltanen <lauri(dot)siltanen(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Feature: psql - display current search_path in prompt
Date: 2025-10-24 14:20:38
Message-ID: aPuLNucQ-559GSUM@nathan
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On Fri, Oct 24, 2025 at 05:10:13PM +0300, Florents Tselai wrote:
> Good catch. v2 attached

Thanks.

+ <varlistentry id="app-psql-prompting-S">
+ <term><literal>%S</literal></term>
+ <listitem><para>The current search path.</para></listitem>
+ </varlistentry>

I'd suggest linking to a page about the search_path [0].

+extern const char *session_search_path(void);

This function appears to be unused.

+ /*
+ * Distinguish unknown (NULL) from an empty but valid search_path ("").
+ * If not connected or older server doesn't report it via ParameterStatus,
+ * show "?".
+ */
+ if (!pset.db || PQparameterStatus(pset.db, "search_path") == NULL)
+ strlcpy(buf, "?", sizeof(buf));
+ else
+ strlcpy(buf, PQparameterStatus(pset.db, "search_path"), sizeof(buf));
+ break;

Shouldn't we move most of this logic to session_search_path() and use it
here?

[0] https://www.postgresql.org/docs/current/ddl-schemas.html#DDL-SCHEMAS-PATH

--
nathan

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