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Idea: unify *newline(-and-indent)
From: |
Daniel Colascione |
Subject: |
Idea: unify *newline(-and-indent) |
Date: |
Sun, 31 Aug 2008 05:37:46 -0400 |
The newline situation has annoyed me for a long time. Before fixing
it, I figure I'll float the idea here and see what kind of reception I
get.
In emacs CVS, I found these functions:
ada-indent-newline-indent-conditional
align-newline-and-indent
c-context-line-break
c-newline-and-indent
electric-pascal-terminate-line
electric-verilog-terminate-and-indent
electric-verilog-terminate-line
html-paragraph
idlwave-newline
m2-newline
message-newline-and-reformat
newline
newline-and-indent
octave-reindent-then-newline-and-indent
reindent-then-newline-and-indent
table--cell-newline-and-indent
vera-electric-return
vhdl-electric-return
I'm not even counting all the modes that aren't in CVS, or all the
(reindent-)newline(-and-indent) functions grep couldn't find. Why do
we need so many functions for essentially the same thing? Recently, I
tried seeing whether I could make newline not kill trailing
whitespace. I'd have to rewrite the newline function quite a few major
modes, and the solution would still be brittle.
Why not unify all the newline-and-friends functions?
- Cull the above list to three functions
interactive-newline (new function)
newline-and-indent
reindent-then-newline-and-indent
- Change the C-m binding in bindings.el to interactive-newline.
- Define a new variable, interactive-newline-function, which defaults
to #'newline.
(The existing #'newline would stay the same for backward
compatibility. I see 122 direct calls to (newline) in current CVS, and
I bet the callers wouldn't like new behavior.)
Change newline-and-indent and reindent-then-newline-and-indent to call
interactive-newline instead of newline. Have interactive-newline call
interactive-newline-function. (Which is plain old #'newline by
default, remember.)
Then, take all the functions above and convert them to functions that
can be plugged into interactive-newline-function. The situation we end
up with something like indent-for-tab-command and indent-line-function.
Is it worth writing the patch?
Thanks,
Dan
(Also – any objections to making cc-mode and lisp-mode use indent-for-
tab-command? The lisp tab command
has an indent-whole-sexp feature, but that be handled by passing the
prefix argument to indent-line-function. The cc-mode indent function
has some tab-or-indent DWIM feature, but isn't it better to put that
in indent-for-tab-command by extending tab-always-indent?)
- Idea: unify *newline(-and-indent),
Daniel Colascione <=