Add state information to eshell git prompt

Also stay put when no open checkbox is found, i.e., do not move to the end of
the subtree.

site-lisp/db-eshell.el

@@ -8,6 +8,7 @@
 
 ;;; Code:
 
+(require 'dash)
 (require 'subr-x)
 (require 'seq)
 (require 'eshell)
@@ -57,10 +58,13 @@
   ;; Inspired by https://github.com/howardabrams/dot-files/blob/master/emacs-eshell.org#special-prompt
   "Return name of git branch of current directory, as a string.
 
-The format will be BASE-DIR::BRANCH-NAME, where BASE-DIR is the
-directory containing the .git directory or link file of the
+The format will be BASE-NAME@BASE-DIR[STATE], where BASE-DIR is
+the directory containing the .git directory or link file of the
 current git repository, and BRANCH-NAME is the name of the
-current branch.
+current branch.  STATE will display information about whether the
+worktree is dirty or whether the repository needs pushing.  When
+no extra state information is available, STATE will be empty and
+the brackets will be ommitted.
 
 Return the empty string if the current directory is not part of a
 git repository."
@@ -73,8 +77,22 @@ git repository."
       (save-match-data
         (let* ((git-branch (string-trim
                             (shell-command-to-string "git rev-parse --abbrev-ref HEAD")))
-               (base-dir (file-name-base (string-trim-right repo-dir "/?"))))
-          (format "%s@%s" git-branch base-dir))))))
+               (base-dir (file-name-base (string-trim-right repo-dir "/?")))
+               (state-list (cl-remove-if #'null
+                                         (list
+                                          (when (file-exists-p (file-name-concat "." ".git" "MERGE_HEAD"))
+                                            "merge")
+                                          (unless (= 0 (call-process "git" nil nil nil
+                                                                     "diff" "--no-ext-diff" "--quiet"))
+                                            "dirty")
+                                          (unless (= 0 (call-process "git" nil nil nil
+                                                                     "diff" "--no-ext-diff" "--quiet" "--cached"))
+                                            "uncommitted")
+                                          (unless (string-empty-p (shell-command-to-string "git stash list --quiet"))
+                                            "stash")))))
+          (if state-list
+              (format "%s@%s[%s]" git-branch base-dir (apply #'concat (-interpose "|" state-list)))
+            (format "%s@%s" git-branch base-dir)))))))
 
 (defun eshell/default-prompt-function ()
   "A prompt for eshell of the form

site-lisp/db-org.el

@@ -770,12 +770,20 @@ If there's no such open checkbox, emit a message and stay put."
   (unless (derived-mode-p 'org-mode)
     (user-error "Not in Org buffer, exiting"))
   (save-restriction
-    (widen)
-    (org-back-to-heading 'invisible-ok)
-    (org-narrow-to-subtree)
-    (unless (or (re-search-forward "\\[-\\]" nil 'no-error)
-                (re-search-forward "\\[ \\]" nil 'no-error))
-      (message "No open checkbox in subtree"))))
+    (let ((original-point (point)))
+      (widen)
+      (org-back-to-heading 'invisible-ok)
+      (org-narrow-to-subtree)
+      (unless
+          ;; Yes, progn is not strictly necessary, but it feels cleaner this way.
+          (or (progn
+                (goto-char (point-min))
+                (re-search-forward " \\[-\\] " nil 'no-error))
+              (progn
+                (goto-char (point-min))
+                (re-search-forward " \\[ \\] " nil 'no-error)))
+        (message "No open checkbox in subtree")
+        (goto-char original-point)))))
 
 
 ;;; Calendar