This is a modified version of haskell-indentation-mode. Currently
the semantic parser is not changed, but the UI of tab completion is
reworked. Most notably:
- DEL and C-d is not mapped: if you want to indent backwards, you can
use S-TAB. This means no random jumping on backspace anymore.
- TAB steps to the right as before, but when the end is reached, it
starts going to the left instead of wrapping around.
- TAB stays inside the code, instead of going to the beginning of the
line. As in pyhton-mode and perl-mode.
- Region indentation common case is supported: TAB and S-TAB is simply
moving the whole region to the left/right by 1-column. Can be
pressed repeatedly.
- The current indentations are shown as underscores in the current
line. So you have some visual indication on what's gonna happen.
Also useful while hacking on the parser and want to see the results.
Can be turned off by setting hi2-show-indentations to nil in your
init file or calling hi2-disable-show-indentations from the buffer.
If there are collisions with other overlay hacking modes
(e.g. fill-column-indicator), try to turn off
hi2-show-indentations-after-eol.
- The buffer is not changed when indentation is not changed (so there
are no undo points created and no dirty flag in the buffer if
pressing TAB had no effect).
- The code for all this is somewhat commented and cleaned.
There is ongoing development on making this better and I invite
everyone to participate (report bugs, fix issues, etc.):
https://github.com/errge/hi2
Once this is stable and better in every way than the default
haskell-indentation-mode, I'm happy to merge it with haskell-mode,
but until this is moving fast, I want to keep it separate.
Installation:
To turn indentation on for all Haskell buffers under Haskell mode
add this to .emacs:
(add-hook haskell-mode-hook 'turn-on-hi2)
Otherwise, call `hi2-mode'.