[Fix #2112] Add a new interactive command cider-find-keyword

It basically finds the first usage of the namespace-qualified keywords.
For `::other.namespace/foo` this command would go to `other.namespace`
and then find the first mention of `:foo` in it.

Author: bbatsov

CHANGELOG.md

@@ -7,6 +7,7 @@
 * [#2082](https://github.com/clojure-emacs/cider/pull/2082), [cider-nrepl#440](https://github.com/clojure-emacs/cider-nrepl/pull/440): Add specialized stacktraces for clojure.spec assertions.
 * [#2111](https://github.com/clojure-emacs/cider/pull/2111): Add `cider-pprint-eval-last-sexp-to-comment` and `cider-pprint-eval-defun-to-comment`.
 * Add a REPL shortcut for `cider-repl-require-repl-utils` (this makes it easy to require common functions like `doc`, `source`, etc. in REPL buffers).
+* [#2112](https://github.com/clojure-emacs/cider/issues/2112): Add a new interactive command `cider-find-keyword` (bound to `C-c C-:`).
 
 ### Changes
 

cider-interaction.el

@@ -504,6 +504,39 @@ the results to be displayed in a different window."
            (ns (completing-read "Find namespace: " namespaces)))
       (cider--find-ns ns (cider--open-other-window-p arg)))))
 
+(defun cider-find-keyword (&optional arg)
+  "Find the namespace of the keyword at point and its first occurrence there.
+
+For instance - if the keyword at point is \":cider.demo/keyword\", this command
+would find the namespace \"cider.demo\" and afterwards find the first mention
+of \"::keyword\" there.
+
+Prompt according to prefix ARG and `cider-prompt-for-symbol'.
+A single or double prefix argument inverts the meaning of
+`cider-prompt-for-symbol'.  A prefix of `-` or a double prefix argument causes
+the results to be displayed in a different window.  The default value is
+thing at point."
+  (interactive "P")
+  (cider-ensure-connected)
+  (let* ((kw (let ((kw-at-point (cider-symbol-at-point 'look-back)))
+               (if (or cider-prompt-for-symbol arg)
+                   (read-string
+                    (format "Keyword (default %s): " kw-at-point)
+                    nil nil kw-at-point)
+                 kw-at-point)))
+         (ns-qualifier (and
+                        (string-match "^:+\\(.+\\)/.+$" kw)
+                        (match-string 1 kw)))
+         (kw-ns (if ns-qualifier
+                    (cider-resolve-alias (cider-current-ns) ns-qualifier)
+                  (cider-current-ns)))
+         (kw-to-find (concat "::" (replace-regexp-in-string "^:+\\(.+/\\)?" "" kw))))
+
+    (when (and ns-qualifier (string= kw-ns (cider-current-ns)))
+      (error "Could not resolve alias `%s' in `%s'" ns-qualifier (cider-current-ns)))
+    (cider--find-ns kw-ns arg)
+    (search-forward-regexp kw-to-find nil 'noerror)))
+
 (defvar cider-completion-last-context nil)
 
 (defun cider-completion-symbol-start-pos ()

cider-mode.el

@@ -269,6 +269,7 @@ Configure `cider-cljs-*-repl' to change the ClojureScript REPL to use for your b
     ("Find (jump to)"
      ["Find definition" cider-find-var]
      ["Find resource" cider-find-resource]
+     ["Find keyword" cider-find-keyword]
      ["Go back" cider-pop-back])
     ("Macroexpand"
      ["Macroexpand-1" cider-macroexpand-1]
@@ -301,6 +302,7 @@ Configure `cider-cljs-*-repl' to change the ClojureScript REPL to use for your b
     (define-key map (kbd "C-c C-d") 'cider-doc-map)
     (define-key map (kbd "M-.") #'cider-find-var)
     (define-key map (kbd "C-c C-.") #'cider-find-ns)
+    (define-key map (kbd "C-c C-:") #'cider-find-keyword)
     (define-key map (kbd "M-,") #'cider-pop-back)
     (define-key map (kbd "C-c M-.") #'cider-find-resource)
     (define-key map (kbd "M-TAB") #'complete-symbol)

cider-repl.el

@@ -1431,6 +1431,7 @@ constructs."
 (declare-function cider-find-resource "cider-interaction")
 (declare-function cider-restart "cider-interaction")
 (declare-function cider-find-ns "cider-interaction")
+(declare-function cider-find-keyword "cider-interaction")
 (declare-function cider-switch-to-last-clojure-buffer "cider-mode")
 
 (defvar cider-repl-mode-map
@@ -1440,6 +1441,7 @@ constructs."
     (define-key map (kbd "C-c C-t") 'cider-test-commands-map)
     (define-key map (kbd "M-.") #'cider-find-var)
     (define-key map (kbd "C-c C-.") #'cider-find-ns)
+    (define-key map (kbd "C-c C-:") #'cider-find-keyword)
     (define-key map (kbd "M-,") #'cider-pop-back)
     (define-key map (kbd "C-c M-.") #'cider-find-resource)
     (define-key map (kbd "RET") #'cider-repl-return)
@@ -1486,6 +1488,7 @@ constructs."
         ("Find"
          ["Find definition" cider-find-var]
          ["Find resource" cider-find-resource]
+         ["Find keyword" cider-find-keyword]
          ["Go back" cider-pop-back])
         "--"
         ["Switch to Clojure buffer" cider-switch-to-last-clojure-buffer]