--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mylisp/autobm.el	Sat Jan 02 00:33:04 2021 +0200
@@ -0,0 +1,84 @@
+;;; autobm.el --- suggest bookmark name from local context -*- lexical-binding: t -*-
+
+(require 'cl-lib)
+(require 'bookmark)
+(require 'which-func)
+(require 'semantic/find)
+
+(defvar autobm-mode-handlers
+  '((emacs-lisp-mode . (autobm-try-semantic))
+    (semantic-decoration-mode . (autobm-try-semantic))
+    (rst-mode . (autobm-try-word))
+    (t . (autobm-try-which-func autobm-try-thingatpt)))
+  "Alist of handlers by mode. Key is a mojor or minor mode name, or `t' as fallback.
+Value is a no-argument function or a list of such functions,
+which returns string or `nil'.")
+
+(defun autobm-try-which-func ()
+  (which-function))
+
+(defvar autobm-try-thingatpt-things
+  '(symbol url email))
+
+(defun autobm-try-thingatpt ()
+  (cl-some #'thing-at-point autobm-try-thingatpt-things))
+
+(defun autobm-try-word ()
+  (thing-at-point 'word))
+
+(defun autobm-try-line ()
+  (let ( (line (thing-at-point 'line)) )
+    (substring line 0 (min (1- (length line)) 30))))
+
+(defun autobm-get-active-handlers ()
+  (let ( h handlers (modes (list major-mode)) )
+    (dolist (m minor-mode-list)
+      (when (and (boundp m) (symbol-value m))
+        (push m modes)))
+    (push t modes)
+    (dolist (m modes)
+      (setq h (assoc m autobm-mode-handlers))
+      (when h
+        (setq h (cdr h))
+        (cond
+         ((symbolp h)
+          (push h handlers))
+         ((listp h)
+          (setq handlers (append h handlers)))
+         (t (error "autobm-mode-handlers isn't a list or a symbol")))))
+    handlers))
+
+(defvar autobm-try-semantic-type-alist
+  '((variable . "var")
+    (function . "fn")
+    (type . "type")))
+
+(defun autobm-try-semantic ()
+  (let ( (tag (semantic-current-tag)) prefix )
+    (when tag
+      (setq prefix (assoc (cadr tag) autobm-try-semantic-type-alist))
+      (when prefix
+        (format "%s: %s" (cdr prefix) (car tag))))))
+
+(defun autobm-suggest ()
+  "Suggest bookmark name depending on buffer mode and local
+context using `autobm-try-semantic-type-alist'. First checked major
+mode then active minor modes."
+  (let ((result  nil))
+    (catch 'exit
+      (dolist (h (autobm-get-active-handlers))
+        (when (setq result (funcall h))
+          (throw 'exit result))))))
+
+;;;###autoload
+(defun autobm (&optional no-overwrite)
+  (interactive "P")
+  (let ( (name (autobm-suggest)) )
+    (when name
+      (setq name (read-string "Set bookmark: " name bookmark-minibuffer-read-name-map name)))
+    (bookmark-set name no-overwrite)))
+
+;; (global-set-key (kbd "C-x r m") 'autobm)
+
+(provide 'autobm)
+