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From: Roman Perepelitsa <roman.perepelitsa@gmail.com>
Date: Sat, 11 Jan 2020 15:30:01 +0100
Message-ID: <CAN=4vMp7aKDLbxvyLxPunc2UfexhKNZhZqbPSOxvd1EUXwXRaw@mail.gmail.com>
Subject: Re: z-sy-h and z-asug: zle-line-pre-redraw, POSTDISPLAY, coexistence
 (was: Re: emulate bash key bindings)
To: Sebastian Gniazdowski <sgniazdowski@gmail.com>
Cc: Daniel Shahaf <d.s@daniel.shahaf.name>, Zsh Users <zsh-users@zsh.org>
Content-Type: text/plain; charset="UTF-8"

[moving ericdfreese@gmail.com to bcc as this isn't related to
zsh-autosuggestions]

On Sat, Jan 11, 2020 at 12:46 AM Sebastian Gniazdowski
<sgniazdowski@gmail.com> wrote:
> Yes, it contains the code to extract the commands and also function
> bodies from Zsh source. The code responsible for this starts at line
> 186 of src/zsd-detect.main. The place in code to get the command is
> line 325 of the file.

Thanks, this is the hint I needed . $token at zsd-detect.main:325 is
always a word in the command position, right?

I'm looking for a parser that's a bit more precise. Here are a few
examples of zsh code I want to be handled correctly:

  2>&1 x

  x <<END
  y
  END

  for x ( ; ) y

  case x in
    a) y;;
    b)
  esac

I also need alias expansion. For example, given this setup:

  alias a='1> '  # note the trailing space
  alias b='/dev/null x'
  alias x=y
  alias c=';'

The parser should give me `x` when parsing `a b c d` because after
alias expansion `a b c d` becomes this:

  1> /dev/null y c d

The parser needs to be fast as I'm going to be calling it from zle. It
shouldn't perform I/O (no file globbing) and must not have side
effects. These constraints mean that correct parsing is impossible to
implement. For example, there is no way to figure out what `*` does .
I'm OK with it. Given the choice between false positives (parser says
something is a command when it isn't) and false negatives (parser
misses a command), I would prefer false positives.

I'm not asking you (or anyone else) to build this for me. Just sharing
to provide context.

Roman.