fix(health): check for errors when executing commands. Closes #1599

Author: folke

lua/lazy/health.lua

@@ -37,13 +37,17 @@ function M.have(cmd, opts)
   for _, c in ipairs(cmd) do
     if vim.fn.executable(c) == 1 then
       local version = vim.fn.system(c .. " " .. opts.version) or ""
-      version = vim.trim(vim.split(version, "\n")[1])
-      version = version:gsub("^%s*" .. vim.pesc(c) .. "%s*", "")
-      if opts.version_pattern and not version:find(opts.version_pattern, 1, true) then
-        opts.warn(("`%s` version `%s` needed, but found `%s`"):format(c, opts.version_pattern, version))
+      if vim.v.shell_error ~= 0 then
+        opts.error(("failed to get version of {%s}\n%s"):format(c, version))
       else
-        found = ("{%s} `%s`"):format(c, version)
-        break
+        version = vim.trim(vim.split(version, "\n")[1])
+        version = version:gsub("^%s*" .. vim.pesc(c) .. "%s*", "")
+        if opts.version_pattern and not version:find(opts.version_pattern, 1, true) then
+          opts.warn(("`%s` version `%s` needed, but found `%s`"):format(c, opts.version_pattern, version))
+        else
+          found = ("{%s} `%s`"):format(c, version)
+          break
+        end
       end
     end
   end