fix(vim.system): improve error message when cwd does not exist

Problem:
vim.uv.spawn will emit ENOENT for either when the cmd or cwd do not
exist and does not tell you which.

Solution:
If an error occurs, check if cwd was supplied and included in the error
message if it does not exist.

1 files changed, 7 insertions, 1 deletions

diff --git a/runtime/lua/vim/_system.lua b/runtime/lua/vim/_system.lua
index c5cb9b73ea..e40229de63 100644
--- a/runtime/lua/vim/_system.lua
+++ b/runtime/lua/vim/_system.lua
@@ -246,7 +246,13 @@ local function spawn(cmd, opts, on_exit, on_error)
   local handle, pid_or_err = uv.spawn(cmd, opts, on_exit)
   if not handle then
     on_error()
-    error(('%s: "%s"'):format(pid_or_err, cmd))
+    if opts.cwd and not uv.fs_stat(opts.cwd) then
+      error(("%s (cwd): '%s'"):format(pid_or_err, opts.cwd))
+    elseif vim.fn.executable(cmd) == 0 then
+      error(("%s (cmd): '%s'"):format(pid_or_err, cmd))
+    else
+      error(pid_or_err)
+    end
   end
   return handle, pid_or_err --[[@as integer]]
 end