Adding dumb-jump to navigate my code trees

ha-config.org

@@ -826,16 +826,33 @@ Let's try this out with a Hydra since some I can /repeat/ some commands (e.g. en
   (ha-leader "w" '("windows" . hydra-window-resize/body))
 #+end_src
 *** Search Operations
-Ways to search for information goes under the ~s~ key. This primarily depends on the [[https://github.com/dajva/rg.el][rg]] package, which builds on the internal =grep= system, and creates a =*rg*= window with =compilation= mode, so ~C-j~ and ~C-k~ will move and show the results by loading those files.
+Ways to search for information goes under the ~s~ key. The venerable sage has always been =grep=, but we now have new-comers, like [[https://github.com/BurntSushi/ripgrep][ripgrep]], which are really fast.
+**** ripgrep
+Install the [[https://github.com/dajva/rg.el][rg]] package, which builds on the internal =grep= system, and creates a =*rg*= window with =compilation= mode, so ~C-j~ and ~C-k~ will move and show the results by loading those files.
 
 #+begin_src emacs-lisp
   (use-package rg
-    :init                               ; I sometimes call `grep`:
+    :general (:states 'normal "gr" 'rg-dwim)
-    ; (grep-apply-setting 'grep-command "rg -n -H --no-heading -e ")
 
     :config
+    ;; Make an interesting Magit-like menu of options, which I don't use much:
     (rg-enable-default-bindings (kbd "M-R"))
 
+    ;; In case I call (or something else) calls `grep':
+    (grep-apply-setting 'grep-command "rg -n -H --no-heading -e ")
+
+    ;; Old habits die hard ...
+    (define-key global-map [remap xref-find-references] 'rg-dwim)
+
+    (advice-add 'wgrep-change-to-wgrep-mode :after #'evil-normal-state)
+    (advice-add 'wgrep-to-original-mode :after #'evil-motion-state)
+    (defvar rg-mode-map)
+    (add-to-list 'evil-motion-state-modes 'rg-mode)
+    (evil-add-hjkl-bindings rg-mode-map 'motion
+      "e" #'wgrep-change-to-wgrep-mode
+      "g" #'rg-recompile
+      "t" #'rg-rerun-change-literal)
+
     (ha-leader
       "s"  '(:ignore t :which-key "search")
       "s q" '("close" . ha-rg-close-results-buffer)
@@ -873,9 +890,9 @@ Ways to search for information goes under the ~s~ key. This primarily depends on
       (previous-error-no-select)
       (compile-goto-error)))
 #+end_src
-
+Note we bind the key ~M-R~ to the [[help:rg-menu][rg-menu]], which is a Magit-like interface to =ripgrep=.
+**** wgrep
 The [[https://github.com/mhayashi1120/Emacs-wgrep][wgrep package]] integrates with =ripgrep=. Typically, you hit ~i~ to automatically go into =wgrep-mode= and edit away, but since I typically want to edit everything at the same time, I have a toggle that should work as well:
-
 #+begin_src emacs-lisp
   (use-package wgrep
     :after rg

ha-programming.org

@@ -171,6 +171,22 @@ To take advantage of this, type:
   - ~z a~ :: Toggles open to close
 
 Note: Yes, we could use [[https://github.com/mrkkrp/vimish-fold][vimish-fold]] (and its cousin, [[https://github.com/alexmurray/evil-vimish-fold][evil-vimish-fold]]) and we’ll see if I need those.
+** Navigation
+Once upon a time, we use to create a =TAGS= file that contained the database for navigating code bases, but with new faster versions of grep, e.g.  [[https://beyondgrep.com][ack]], [[https://github.com/ggreer/the_silver_searcher][ag]] (aka, the Silver Searcher),  [[https://github.com/Genivia/ugrep][ugrep]] and [[https://github.com/BurntSushi/ripgrep][ripgrep]], we should just be able to use them.  but I want to:
+  - Be in a function, and see its callers. For this, the [[help:rg-dwim][rg-dwim]] function is my bread-and-butter.
+  - Be on a function, and jump to the definition. For this, I use [[https://github.com/jacktasia/dumb-jump][dumb-jump]], which uses the above utilities.
+
+#+begin_src emacs-lisp
+  (use-package dumb-jump
+    :config
+    (setq xref-show-definitions-function #'xref-show-definitions-completing-read)
+    (add-hook 'xref-backend-functions #'dumb-jump-xref-activate))
+#+end_src
+
+Remember the following:
+  - ~g d~ jumps to definition of symbol at point … which is amazeballs.
+  - ~g r~ shows us all entries of the symbol at point, like [[help:xref-find-references][xref-find-references]]
+  - ~M-,~ to go back along the jump history
 ** Language Server Protocol (LSP) Integration
 The [[https://microsoft.github.io/language-server-protocol/][LSP]] is a way to connect /editors/ (like Emacs) to /languages/ (like Lisp)… wait, no, it was originally designed for VS Code and probably Python, but we now abstract away [[https://github.com/davidhalter/jedi][Jedi]] and the [[http://tkf.github.io/emacs-jedi/latest/][Emacs integration to Jedi]] (and duplicate everything for Ruby, and Clojure, and…).