ERROR: UndefVarError: iscall not defined at startup

[tencnivel]

When starting the julia session using C-c C-z from a julia file buffer

               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.6.3 (2021-09-23)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org/ release
|__/                   |

julia> JuliaSnail.start(10011); # please wait, time-to-first-plot...
ERROR: UndefVarError: iscall not defined
Stacktrace:
 [1] (::Main.JuliaSnail.CST.var"#1#2"{String, Dict{Any, Any}})(node::CSTParser.EXPR, modules::Vector{Any})
   @ Main.JuliaSnail.CST ~/.emacs.d/elpa/julia-snail-20210818.310/JuliaSnail.jl:535
 [2] (::Main.JuliaSnail.CST.var"#1#2"{String, Dict{Any, Any}})(node::CSTParser.EXPR)
   @ Main.JuliaSnail.CST ~/.emacs.d/elpa/julia-snail-20210818.310/JuliaSnail.jl:534
 [3] includesin(encodedbuf::String, path::String)
   @ Main.JuliaSnail.CST ~/.emacs.d/elpa/julia-snail-20210818.310/JuliaSnail.jl:547
 [4] includesin
   @ ~/.emacs.d/elpa/julia-snail-20210818.310/JuliaSnail.jl:529 [inlined]
 [5] forcecompile
   @ ~/.emacs.d/elpa/julia-snail-20210818.310/JuliaSnail.jl:565 [inlined]
 [6] start(port::Int64)
   @ Main.JuliaSnail ~/.emacs.d/elpa/julia-snail-20210818.310/JuliaSnail.jl:686
 [7] top-level scope
   @ REPL[1]:1

[gcv]

What version of CSTParser do you have installed in your Julia environment? In a fresh session of the Snail REPL, run the following:

Pkg.activate(LOAD_PATH[end]); Pkg.status()

What is the output?

[tencnivel]

Apparently CSTParser was not downloaded.
I instantiated JuliaSnail.jl and tried to relaunch julia-snail, but same error.
There is also a timed-out message in the 'Messages' buffer (see below) and the VTerm opened by julia-snail is opened at the location of my home directory instead of the directory where the julia file is.

Output from the REPL buffer

julia> LOAD_PATH[end]
"/home/myuser/.emacs.d/elpa/julia-snail-20210818.310"

julia> using Pkg

julia> Pkg.activate(LOAD_PATH[end])
  Activating environment at `~/.emacs.d/elpa/julia-snail-20210818.310/Project.toml`

julia> Pkg.status()
      Status `~/.emacs.d/elpa/julia-snail-20210818.310/Project.toml`
→ [00ebfdb7] CSTParser v3.2.3
        Info packages marked with → not downloaded, use `instantiate` to download

(julia-snail-20210818.310) pkg> instantiate
   Installed CSTParser ─ v3.2.3
┌ Debug: Creating new cache for "/home/myuser/.emacs.d/elpa/julia-snail-20210818.310/Manifest.toml"
└ @ Base loading.jl:225
┌ Debug: Rejecting cache file /home/myuser/.julia/compiled/v1.6/Tokenize/7Oi97_b8jdf.ji because it is for file /home/myuser/.julia/packages/Tokenize/FGrTw/src/Tokenize.jl) not file /home/myuser/.julia/packages/Tokenize/kKojO/src/Tokenize.jl
└ @ Base loading.jl:1770
┌ Debug: Rejecting cache file /home/myuser/.julia/compiled/v1.6/Tokenize/7Oi97_giU3j.ji due to it containing an invalid cache header
└ @ Base loading.jl:1719
Precompiling project...
  ✓ Tokenize
  ✓ CSTParser
  2 dependencies successfully precompiled in 6 seconds
  2 dependencies precompiled but different versions are currently loaded. Restart julia to access the new versions

(julia-snail-20210818.310) pkg>

Output from the 'Messages' buffer:

Starting Julia process and loading Snail...
Snail connecting to Julia process, attempt 1/5...
Snail connected to Julia. Happy hacking!
julia-snail--send-to-server: Snail command timed out

[gcv]

Looks like you have CSTParser already installed in your global Julia environment, which conflicts with the version Snail tries to install. You probably have something from the v2 series, while Snail requires v3.

Remove CSTParser and Tokenize from your global environment and try to restart Snail.

I should try to make Snail more resilient for when this occurs. At least an informative error message would be nice. :)

Meanwhile, why do you have CSTParser explicitly installed in your global environment? Were you hacking on it? Or did another tool install it? I thought most tools which depend on it have the grace to keep it isolated (as Snail does), but maybe not.

[tencnivel]

Atom installed it and the Project.toml of Atom.jl has the following compat definition:

[compat]
CSTParser = "=1.1.0, ^2"

What would you recommend?
Install CSTParser v3 in my global environment together with CSTParser v2? I have to keep Atom

[gcv]

I was thinking about how to deal with tooling which leaves conflicting litter in the global environment, and I may have a solution. Commit 74aa827 on branch https://github.com/gcv/julia-snail/tree/fix-load-path-order.

Could you try running Julia from that branch? If you don't use an Emacs package manager or extension which can install arbitrary branches (such as Quelpa or Straight.el), the easiest way is to replace the JuliaSnail.jl file in your Snail installation with https://raw.githubusercontent.com/gcv/julia-snail/fix-load-path-order/JuliaSnail.jl (only the Julia side changed which makes this possible).

It just changes the LOAD_PATH order at startup so that Snail's dependencies load first, and then restores it.

[tencnivel]

Using JuliaSnail.jl from branch https://raw.githubusercontent.com/gcv/julia-snail/fix-load-path-order/JuliaSnail.jl fixed the problem.

[gcv]

Branch merged into master.