gdb: add match formatter mechanism for 'complete' command output
This commit solves a problem that existed prior to the previous
commit, but the previous commit made more common.
When completing a filename with the 'complete' command GDB will always
add a trailing quote character, even if the completion is a directory
name, in which case it would be better if the trailing quote was not
added. Consider:
(gdb) complete file '/tmp/xx
file '/tmp/xxx/'
The completion offered here is really only a partial completion, we've
completed up to the end of the next directory name, but, until we have
a filename then the completion is not finished and the trailing quote
should not be added.
This would match the readline behaviour, e.g.:
(gdb) file '/tmp/xx<TAB>
(gdb) file '/tmp/xxx/
In this case readline completes the directory name, but doesn't add
the trailing quote character.
Remember that the 'complete' command is intended for tools like
e.g. emacs in order that they can emulate GDB's standard readline
completion when implementing a CLI of their own. As such, not adding
the trailing quote in this case matches the readline behaviour, and
seems like the right way to go.
To achieve this, I've added a new function pointer member variable
completion_result::m_match_formatter. This contains a pointer to a
callback function which is used by the 'complete' command to format
each result.
The default behaviour of this callback function is to just append the
quote character (the character from before the completion string) to
the end of the completion result. This matches the current behaviour.
However, for filename completion we override the default value of
m_match_formatter, this new function checks if the completion result
is a directory or not. If the completion result is a directory then
the closing quote is not added, instead we add a trailing '/'
character.
The code to add a trailing '/' character already exists within the
filename_completer function. This is no longer needed in this
location, instead this code is moved into the formatter callback.
Tests are updated to handle the changes in functionality, this removes
an xfail added in the previous commit.
3 files changed
