[திங்கள் செப்டம்பர் 11, 2017] Dmitry Gutov wrote:
On 9/10/17 7:23 PM, Tom Tromey wrote:
It would be nice if imenu were a back end for xref.
Then M-. could also use symbols found by imenu.
A further wrinkle on this would be if xref, project, and imenu
worked
together, so that M-. would automatically know to look at imenu results
for other buffers in the same project.
Agreed. It could be a nice default for when no tags table is currently
visited.
I tried to write a general imenu backend in attached file (extracted
from my init.el) but I hit quite a few roadblocks,
1. I activate the imenu backend iff there are no tags table defined
for the buffer but this means that one cannot use the imenu
backend to jump to definitions for symbols that TAGS do not know
of currently. I can think of two ways to solve this problem,
(a) Check if the symbol is in TAGS table.
(b) Modify the etags backend so that the user can say "I have no
TAGS table for this file/project/whatever."
(a) is definitely not clean, and (b) sounds feasible but similar
situation can also exist with other backends (like elisp).
I'm lost on how to solve this problem.
2. I have not defined all the methods and the completion-table does
not handle the nested case of the index alist. AFAIU from `(elisp)
Programmed Completion', completion "ends" when `try-completion'
returns t but I seem to be mistaken. I have to rewrite
completion-table to be like `imenu--completion-buffer' but I don't
know how to pull that off.
3. `imenu-xref--in-alist' is mostly a 1-1 copy of `imenu--in-alist'
with the only difference being my function returns all matches of
the symbol instead of just the first one. This should be easy
enough to fix by adding an optional argument INCLUDE-ALL to
`imenu--in-alist'.
I'm testing in python-mode with the following settings,
(setq imenu-name-lookup-function (lambda (symbol item) (string-prefix-p
symbol item))
python-imenu-format-parent-item-jump-label-function (lambda (_ name)
name))