From d83fcdf645a3b0a05458a83f67094240aee99bd0 Mon Sep 17 00:00:00 2001
From: Roland Walker <walker@pobox.com>
Date: Sat, 21 Feb 2026 08:24:43 -0500
Subject: [PATCH] let prompt changes respect dynamic format strings

The interactive "prompt" command was calling get_prompt() to set the
prompt format.  But get_prompt() computes the substituted values of any
format strings.

Therefore the interactive "prompt" command was burning in any
dynamically-computed values such as the date or the database name as
a static value.

This is a bug, and it differs from the behavior of setting the prompt
option in ~/.myclirc, which works correctly here.

The fix is to set the prompt format directly to the argument to
change_prompt_format(), because the argument _is_ a format string.
---
 changelog.md  | 14 +++++++++++++-
 mycli/main.py |  2 +-
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/changelog.md b/changelog.md
index 0126f5bd..9fc4f094 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,16 @@
+Upcoming (TBD)
+==============
+
+Features
+---------
+* Add extra error output on connection failure for possible SSL mismatch (#1584).
+
+
+Bug Fixes
+---------
+* Let interactive changes to the prompt format respect dynamically-computed values.
+
+
 1.56.0 (2026/02/23)
 ==============
 
@@ -6,7 +19,6 @@ Features
 * Let the `--dsn` argument accept literal DSNs as well as aliases.
 * Accept `--character-set` as an alias for `--charset` at the CLI.
 * Add SSL/TLS version to `status` output.
-* Add extra error output on connection failure for possible SSL mismatch (#1584)
 * Accept `socket` as a DSN query parameter.
 * Accept new-style `ssl_mode` in DSN URI query parameters, to match CLI argument.
 * Fully deprecate the built-in SSH functionality.
diff --git a/mycli/main.py b/mycli/main.py
index 689c6c1d..a93aa6ba 100755
--- a/mycli/main.py
+++ b/mycli/main.py
@@ -435,7 +435,7 @@ def change_prompt_format(self, arg: str, **_) -> list[SQLResult]:
             message = "Missing required argument, format."
             return [SQLResult(status=message)]
 
-        self.prompt_format = self.get_prompt(arg)
+        self.prompt_format = arg
         return [SQLResult(status=f"Changed prompt format to {arg}")]
 
     def initialize_logging(self) -> None: