[PATCH B4] Show name of module that causes import error

Update the error message for import errors to show the name of the Python
module or library that is missing effectively.

Running 'b4 review tui' on a system that has the Python textual library
installed but misses pygit2, results in

    The TUI requires the textual library.
    Install it with: pip install b4[tui]

Showing the correct name contained in the ImportError instead of
'textual' may help in such cases.

Signed-off-by: Nicolas Schier <[email protected]>
---
 src/b4/bugs/__init__.py  | 4 ++--
 src/b4/review/_review.py | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/b4/bugs/__init__.py b/src/b4/bugs/__init__.py
index 1cd2db42756d..24f0f6364e35 100644
--- a/src/b4/bugs/__init__.py
+++ b/src/b4/bugs/__init__.py
@@ -201,8 +201,8 @@ def cmd_tui(cmdargs: argparse.Namespace) -> None:
     """Launch the bug management TUI."""
     try:
         from b4.bugs._tui import BugListApp
-    except ImportError:
-        logger.critical('The TUI requires the textual library.')
+    except ImportError as e:
+        logger.critical(f'The TUI requires the {e.name} library.')
         logger.critical('Install it with: pip install b4[tui]')
         sys.exit(1)
 
diff --git a/src/b4/review/_review.py b/src/b4/review/_review.py
index a3d82acc186c..a14d7afbb05c 100644
--- a/src/b4/review/_review.py
+++ b/src/b4/review/_review.py
@@ -2444,8 +2444,8 @@ def update_series_tracking(
 def cmd_tui(cmdargs: argparse.Namespace) -> None:
     try:
         from b4.review_tui._entry import run_tracking_tui
-    except ImportError:
-        logger.critical('The TUI requires the textual library.')
+    except ImportError as e:
+        logger.critical(f'The TUI requires the {e.name} library.')
         logger.critical('Install it with: pip install b4[tui]')
         sys.exit(1)
 

---
base-commit: 0e65f947e4f98a3c48a47f280a86dd23845259b0
change-id: 20260611-show-name-of-module-that-causes-import-error-2c84ea5f63bf

Best regards,
--  
Nicolas Schier