Let eglot-jl.jl determine the default project path

README.org

@@ -30,12 +30,12 @@ To work around this issue, you can:
 2. Run the following:
 
 #+begin_src sh
-  JULIA_LOAD_PATH="@" julia --project=path/to/eglot-jl/ path/to/eglot-jl/eglot-jl.jl path/to/project ""
+  julia --project path/to/eglot-jl/eglot-jl.jl
 #+end_src
 
 The SymbolServer is finished with caching dependencies when it
 displays:
 
 #+begin_quote
-[ Info: store set
+[ Info: Received new data from Julia Symbol Server.
 #+end_quote

eglot-jl.el

@@ -51,23 +51,8 @@
 An empty string uses the default depot for ‘eglot-jl-julia-command’
 when the JULIA_DEPOT_PATH environment variable is not set."
   :type 'string)
-
-(defcustom eglot-jl-default-environment "~/.julia/environment/v1.2"
-  "Path to the Julia environment used if file not in a Julia Project."
-  :type 'string)
-
 (defconst eglot-jl-base (file-name-directory load-file-name))
 
-(defun eglot-jl--env (dir)
-  "Find the most relevant Julia Project for a given directory.
-If a parent directory to DIR contains a file JuliaProject.toml or
-Project.toml, that parent directory is used.  If not,
-`eglot-jl-default-environment' is used."
-  (expand-file-name (if dir (or (locate-dominating-file dir "JuliaProject.toml")
-                                (locate-dominating-file dir "Project.toml")
-                                eglot-jl-default-environment)
-                      eglot-jl-default-environment)))
-
 ;; Make project.el aware of Julia projects
 (defun eglot-jl--project-try (dir)
   "Return project instance if DIR is part of a julia project.
@@ -83,9 +68,8 @@ Otherwise returns nil"
   "Return list of strings to be called to start the Julia language server."
   `(,eglot-jl-julia-command
     ,@eglot-jl-julia-flags
-    ,(concat "--project=" eglot-jl-base)
+    "--project"
     ,(expand-file-name "eglot-jl.jl" eglot-jl-base)
-    ,(eglot-jl--env (buffer-file-name))
     ,eglot-jl-depot))
 
 ;;;###autoload

eglot-jl.jl

@@ -1,13 +1,33 @@
-# Make sure that we only load packages from this environment specifically.
+# Usage:
+#   julia --project path/to/eglot-jl/eglot-jl.jl [DEPOT_PATH]
+
+# Get the project environment.
+#
+# WARNING: this script must be called with the `--project` command-line switch
+# for this to work reliably.
+project_path = dirname(Base.load_path()[1])
+
+# Get the depot path. In order of increasing priority
+# - default value: ""
+# - environment:   ENV["JULIA_DEPOT_PATH"]
+# - command-line:  ARGS[1]
+depot_path = get(ENV, "JULIA_DEPOT_PATH", "")
+if length(ARGS) >= 1
+    depot_path = ARGS[1]
+end
+
+# Make sure that we only load packages from the eglot-jl environment specifically.
+import Pkg
+Pkg.activate(@__DIR__)
 empty!(LOAD_PATH)
 push!(LOAD_PATH, "@")
 
-import Pkg
 # In julia 1.4 this operation takes under a second. This can be
 # crushingly slow in older versions of julia though.
 Pkg.instantiate()
 
 using LanguageServer, SymbolServer
 
-server = LanguageServerInstance(stdin, stdout, ARGS[1], ARGS[2])
+@info "Running language server" env=Base.load_path()[1] src_path=pwd() project_path depot_path
+server = LanguageServerInstance(stdin, stdout, project_path, depot_path)
 run(server)