Hi. Filename completion just doesn't work at all. Using
filename-completion-function as a completer for readline always throws
an error.
Minimal example:
(use-modules (ice-9 readline))
(with-readline-completion-function
filename-completion-function
readline)
Hitting TAB when prompted results in:
File: Backtrace:
In ice-9/boot-9.scm:
1736:10 8 (with-exception-handler _ _ #:unwind? _ #:unwind-for-type _)
In unknown file:
7 (apply-smob/0 #<thunk 7ffa51f5e500>)
In ice-9/boot-9.scm:
718:2 6 (call-with-prompt _ _ #<procedure default-prompt-handler (k
proc)>)
In ice-9/eval.scm:
619:8 5 (_ #(#(#<directory (guile-user) 7ffa51f63c80>)))
In ice-9/boot-9.scm:
2806:4 4 (save-module-excursion _)
4351:12 3 (_)
In ice-9/readline.scm:
213:4 2 (with-readline-completion-function _ #<procedure 7ffa4f684328 at
/data/lampilelo/Misc-Scripts/install-wizard.scm:27:1 ()>)
In unknown file:
1 (%readline "File: " #<input: file /dev/pts/1> #<undefined>
#<undefined>)
0 (filename-completion-function "" #t)
ERROR: In procedure filename-completion-function:
In procedure scm_from_stringn: NULL string pointer
My version of Guile is 3.0.4 but I expect it to fail on every version.
It results in an error because the scm_filename_completion_function()
calls readline's rl_filename_completion_function() and doesn't check if
it returned NULL instead of a string.
Readline's info manual states:
"The generator function returns '(char *)NULL' to inform
'rl_completion_matches()' that there are no more possibilities left."
So it's impossible for the current implementation to work, since
scm_filename_completion_function() throws an error every time NULL is
returned.
I'm attaching a patch.
Jakub
0001-Fixed-filename-completion-function-for-readline-comp.patch
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