[Bug cli/30497] New: Bad User Experience with multiple list commands reaching end of file

["blarsen at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30497

            Bug ID: 30497
           Summary: Bad User Experience with multiple list commands
                    reaching end of file
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: cli
          Assignee: unassigned at sourceware dot org
          Reporter: blarsen at redhat dot com
  Target Milestone: ---

A question was raised today on the Libera IRC instance where a user couldn't
understand the error raised by the list command. While the original user never
replied, it was mentioned that a possibly confusing UX would happen in the
following situation:

While debugging a file close to its end, for instance the following:
int main () {
  return 0;
}

starting the inferior, then trying the command list twice we get the following
session:
(gdb) list
1       int main(){
2           return 0;
3       }
(gdb) 
Line number 4 out of range; t.cc has 3 lines.

With this session, the error is pretty easy to understand, but if a user is in
a more complex session, having used "list" then run multiple other commands, to
a point where the user would like to see the current source location again,
they would get the error.

In my opinion, the ideal solution is that GDB should not continue listing the
program if the previous command was not "list", but reprint the current context
instead. If that isn't possible, adding a message like "end of file was
reached. Printing current context again" if there was no argument given to the
command "list" sounds like a decent work-around.

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