* before-change-functions: Getting the changed text?
@ 2017-10-02 13:14 Vibhav Pant
2017-10-02 14:57 ` Phillip Lord
0 siblings, 1 reply; 2+ messages in thread
From: Vibhav Pant @ 2017-10-02 13:14 UTC (permalink / raw)
To: emacs-devel@gnu.org
Is is possible to retrieve the newly changed text string in a
before-change-functions hook? This is an issue with lsp-mode, where we need the
line and column numbers of the old text in order to signal changes in files to
the language server: https://github.com/emacs-lsp/lsp-mode/issues/114
--
Vibhav Pant
vibhavp@gmail.com
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: before-change-functions: Getting the changed text?
2017-10-02 13:14 before-change-functions: Getting the changed text? Vibhav Pant
@ 2017-10-02 14:57 ` Phillip Lord
0 siblings, 0 replies; 2+ messages in thread
From: Phillip Lord @ 2017-10-02 14:57 UTC (permalink / raw)
To: Vibhav Pant; +Cc: emacs-devel@gnu.org
Vibhav Pant <vibhavp@gmail.com> writes:
> Is is possible to retrieve the newly changed text string in a
> before-change-functions hook? This is an issue with lsp-mode, where we need the
> line and column numbers of the old text in order to signal changes in files to
> the language server: https://github.com/emacs-lsp/lsp-mode/issues/114
Yep, because before-change-functions are called before the change. So,
you just get the text that is in the buffer.
You cannot get what the buffer is going to look like after the change
until it has changed. If you need both pieces of information, you have
to store it somewhere before, and then use it after.
Phil
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