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(require 'consult)
(require 'eglot)
(require 'jsonrpc)
(require 'subr-x)
(defvar eglot-jdt--symbolkind-map
'((1 . "File") (2 . "Module") (3 . "Namespace") (4 . "Package")
(5 . "Class") (6 . "Method") (7 . "Property") (8 . "Field")
(9 . "Constructor") (10 . "Enum") (11 . "Interface") (12 . "Function")
(13 . "Variable") (14 . "Constant") (15 . "String") (16 . "Number")
(17 . "Boolean") (18 . "Array") (19 . "Object") (20 . "Key")
(21 . "Null") (22 . "EnumMember") (23 . "Struct") (24 . "Event")
(25 . "Operator") (26 . "TypeParameter"))
"Mapping of LSP SymbolKind integers to human-readable names.")
(defun eglot-jdt--get (obj key)
"Robustly retrieve KEY from LSP OBJ (plist/alist)."
(let* ((kname (substring (symbol-name key) 1))
(sym-key (intern kname)))
(or (plist-get obj key)
(alist-get key obj)
(alist-get sym-key obj)
(alist-get kname obj))))
(defun eglot-jdt--fetch-symbols (&optional query)
"Synchronously fetch workspace symbols for QUERY from Eglot/JDTLS."
(unless (eglot-managed-p)
(user-error "Eglot is not managing this buffer"))
(let* ((server (eglot-current-server))
(symbols (jsonrpc-request server :workspace/symbol `(:query ,(or query "")))))
(when (vectorp symbols)
(setq symbols (append symbols nil)))
symbols))
;; Helper to pad strings
(defun eglot-jdt--pad-right (str width)
"Pad STR on the right with spaces to WIDTH."
(let ((len (length str)))
(if (< len width)
(concat str (make-string (- width len) ?\s))
str)))
;; Main formatting function with faces
(defun eglot-jdt--format-symbols-table (symbols)
"Format SYMBOLS into a table with faces for Consult, showing Kind first."
(let* ((rows (mapcar (lambda (sym)
(let ((kind-num (eglot-jdt--get sym :kind)))
(list (or (alist-get kind-num eglot-jdt--symbolkind-map)
(format "Kind %s" kind-num))
(eglot-jdt--get sym :name)
(or (eglot-jdt--get sym :containerName) "<no-package>")
(let ((location (eglot-jdt--get sym :location)))
(eglot-jdt--get location :uri)))))
symbols))
;; compute max width for each column
(max-kind (apply #'max (mapcar (lambda (r) (length (nth 0 r))) rows)))
(max-name (apply #'max (mapcar (lambda (r) (length (nth 1 r))) rows)))
(max-package (apply #'max (mapcar (lambda (r) (length (nth 2 r))) rows)))
;; faces
(divider-face 'shadow) ;; low opacity / dim for dividers
(kind-face 'font-lock-function-name-face)
(name-face 'font-lock-variable-name-face)
(package-face 'font-lock-keyword-face))
;; create table rows with faces
(mapcar (lambda (r)
(let* ((kind (propertize (eglot-jdt--pad-right (nth 0 r) max-kind) 'face kind-face))
(name (propertize (eglot-jdt--pad-right (nth 1 r) max-name) 'face name-face))
(package (propertize (eglot-jdt--pad-right (nth 2 r) max-package) 'face package-face))
(divider (propertize "|" 'face divider-face)))
(cons (format "%s %s %s %s %s"
kind divider name divider package)
(nth 3 r))))
rows)))
(defun eglot-jdt--open-uri (uri)
"Open a URI returned by the language server, handling jdt:// URIs."
(if (and uri (string-prefix-p "jdt://" uri))
(find-file (expand-file-name uri)) ; your jdt-file-name-handler takes care of this
(find-file (eglot-uri-to-path uri))))
(defun eglot-jdt--sort-by-query (symbols query)
"Sort SYMBOLS by how closely their names match QUERY."
(let ((query (or query "")))
(sort symbols
(lambda (a b)
(< (string-distance (eglot-jdt--get a :name) query)
(string-distance (eglot-jdt--get b :name) query))))))
(defun consult-eglot-jdt-symbols (&optional query)
"Consult interface for Java workspace symbols via Eglot/JDTLS.
Sorts results based on closeness to QUERY."
(interactive "sSymbol query (blank for all): ")
(let* ((symbols (eglot-jdt--fetch-symbols query))
(sorted-symbols (eglot-jdt--sort-by-query symbols query))
(candidates (eglot-jdt--format-symbols-table sorted-symbols))
(selection (consult--read
(mapcar #'car candidates)
:prompt "Symbol: "
:sort nil
:require-match t
:category 'symbol)))
(when selection
(let ((uri (cdr (assoc selection candidates))))
(when uri
(eglot-jdt--open-uri uri))))))
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