detect processing-java core library installation path

lua/kickstart/plugins/lspconfig.lua

@@ -224,6 +224,54 @@ return {
           -- set default config according to sysname
           local config_path = install_path .. '/config_' .. sysname
 
+          -- START SEARCH FOR PROCESSING --
+          -- detect install path based on system
+          local is_windows = vim.fn.has 'win32' == 1
+          local cmds = is_windows and {
+            '(gcm processing.exe).source',
+          } or {
+            'whereis',
+            'processing.exe',
+          }
+
+          -- run syscall and process output
+          local output = vim.system(cmds, { text = true }):wait()
+          local path = output.stdout or ''
+          if not is_windows then
+            -- on linux, get substr starting with path
+            local start_idx = string.find(path, '/')
+            path = (start_idx ~= nil) and string.sub(path, start_idx) or ''
+          end
+
+          -- for windows, remove backslashes
+          path = string.gsub(path, '\\', '/')
+          -- remove filename at end of path
+          local end_idx = string.find(path, '/[^/]*$')
+          path = string.sub(path, 1, end_idx)
+
+          -- in case of chocolatey install, navigate to binaries
+          local is_chocolatey = string.find(path, 'chocolatey')
+          if is_chocolatey then
+            path = path .. '../lib/processing/tools/'
+            -- list directories for program version
+            cmds = is_windows and {
+              'ls',
+              path,
+              '|select name',
+              '|Out-String',
+            } or {
+              'ls',
+              '-l',
+              path,
+            }
+
+            output = vim.system(cmds, { text = true }):wait()
+            local version = string.match(output.stdout, 'processing[^%s]*')
+            path = path .. version
+          end
+          -- set path to processing-core library
+          path = path .. '/core/library/core.jar'
+
           -- See `:help vim.lsp.start_client` for an overview of the supported `config` options.
           local config = {
             -- The command that starts the language server
@@ -260,7 +308,13 @@ return {
             -- See https://github.com/eclipse/eclipse.jdt.ls/wiki/Running-the-JAVA-LS-server-from-the-command-line#initialize-request
             -- for a list of options
             settings = {
-              java = {},
+              java = {
+                project = {
+                  referencedLibraries = {
+                    is_windows and string.gsub(path, '/', '\\') or path,
+                  },
+                },
+              },
             },
 
             -- Language server `initializationOptions`