Linux @lemmy.ml vosjedev @lemm.ee 1y ago

[solved] Any multiline zsh compatible shells? [zsh config]

Some time ago I found xonsh which is a python-based shell. It had really good multiline support, and I am searching for a shell with sameish multiline support as xonsh. Fish shell also has good multiline support, it is around the same level, but it is not posix compatible. I want a shell that has that kind of level of multiline, but zsh (bash is also fine) compatible.

Does anyone know of one?

edit: based on the replies, I get this is unclear. My problem with zsh is that if i press enter and it starts a new line, I can't get back to the prevous line, because a new prompt is started. In fish this is possible, all lines are one prompt. But, fish is not posix compatible. So, I guess I want a posix-compatible shell with fish-like lines (multiple line) editing. I wanted zsh support to keep using my custom oh-my-zsh prompt, but remaking it for a new shell is not a big problem. Sorry for being unclear.

edit 2: solution is here! Thanks to @andy@programming.dev I started thinking and made the following: When on the first line, enter accepts and alt-enter inserts a newline. When not on the first line, enter inserts a newline and alt-enter accepts. Here is the code to put in your .zshrc:

# MULTILINE!!!
bindkey '^[e' push-line-or-edit

# enter accepts when only one line found, else creates newline
function _zle_ml_enter {
    if ! [[ $BUFFER == *$'\n'* ]]; then
        zle accept-line
    else
        zle self-insert-unmeta
    fi
}
zle -N _zle_ml_enter
bindkey '^M' _zle_ml_enter

# alt-enter accepts when more than one line found, else creates newline
function _zle_ml_meta_enter {
    if [[ $BUFFER == *$'\n'* ]]; then
        zle accept-line
    else
        zle self-insert-unmeta
    fi
}
zle -N _zle_ml_meta_enter
bindkey '^[^M' _zle_ml_meta_enter

edit:
changed if [[ "$BUFFERLINES" -le 1 ]]; then to if ! [[ $BUFFER == *$'\n'* ]]; then and if [[ "$BUFFERLINES" -gt 1 ]]; then to if [[ $BUFFER == *$'\n'* ]]; then for improving detection. Also added alt-e shortcut because I had that configured myself but forgot to add here.

17 comments

Your use of "multiline" is not obvious to me.

Most multiline features are available, such as having multiple commands between if, elsif, else and fi is definitely possible (ditto similar constructs), and it's possible to extend commands over an explicit carriage return if the end of line is quoted with a backslash.

If you're talking about having Python-like whitespace-only indentation to specify the level of code, I'm not sure there is a shell like that, but if this is what you mean and you confirm, someone who knows better might be able to point us in that direction.

If you're seeking multiline comments, unfortunately most shells don't have this, but there are definitely ways to fool the shell into skipping portions of text. You would be better off with an editor that can insert a # at the beginning of multiple lines however, since that will guarantee that the shell won't accidentally try to process something in that comment block.
- ah, I updated the post to be clearer :).
Why not xonsh?
- @ultra @vosjedev yc hn 5yr ago
  problems people seem to be stating about xonsh were similar to a lot of the early bugs with Fish, but those things tend to go away once more people start using the shell and reporting issues.
  
  What early bugs with fish?
- because it is a python shell, not a posix shell. and, my python broke, and I don't know how to solve that (but I am not lokking for help with that :)
What behavior are you looking for? Could Zsh with some configuration work?
- I updated my post to be clearer.
  
  OK, well FWIW in Zsh you can use a keybind to trigger ZLE functions that turn your already-entered lines back into in-progress lines.
  
  The most straightforward built-in function for this is push-line-or-edit:
  
  At the top-level (PS1) prompt, equivalent to push-line. At a secondary (PS2) prompt, move the entire current multiline construct into the editor buffer. The latter is equivalent to push-input followed by get-line.
  
  So let's say you want to trigger this with ctrl+e, all you need is:
  
  bindkey '^e' push-line-or-edit
Some tweaks to zsh maybe?

https://gist.github.com/emmanuelnk/d7ceba1f753b3e630f66abbffac5a6ae
- Erm... fish-like multiline editing? This does everything but that... but still thanks, as the syntax hylighting is something I wanted.
  
  There's a great alternative syntax highlighting plugin, btw: https://github.com/zdharma-continuum/fast-syntax-highlighting

17 comments