master 238292d6571 2/2: New option 'project-mode-line' to show project name on mode line (bug#66317)

[Juri Linkov]

branch: master
commit 238292d6571402e93d4f7886baac9853011b36f6
Author: Juri Linkov <juri@linkov.net>
Commit: Juri Linkov <juri@linkov.net>

    New option 'project-mode-line' to show project name on mode line (bug#66317)
    
    * lisp/bindings.el (standard-mode-line-format):
    Add '(project-mode-line project-mode-line-format)'.
    
    * lisp/progmodes/project.el (project-mode-line): New user option.
    (project-menu-entry, project-mode-line-map): New variables.
    (project-mode-line-format): New variable.
    (project-mode-line-format): New function.
---
 etc/NEWS                  |  4 ++++
 lisp/bindings.el          |  1 +
 lisp/progmodes/project.el | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 38 insertions(+)

diff --git a/etc/NEWS b/etc/NEWS
index 8e05c668439..934521ec1b0 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -889,6 +889,10 @@ showcases all their customization options.
 
 ** Project
 
+*** New user option 'project-mode-line'.
+When non-nil, display the name of the current project on
+the mode line.  Clicking mouse-1 pops up the project menu.
+
 *** New user option 'project-file-history-behavior'.
 Customizing it to 'relativize' makes commands like 'project-find-file'
 and 'project-find-dir' display previous history entries relative to
diff --git a/lisp/bindings.el b/lisp/bindings.el
index 207adb3a2a4..70e4087e131 100644
--- a/lisp/bindings.el
+++ b/lisp/bindings.el
@@ -682,6 +682,7 @@ By default, this shows the information specified by 
`global-mode-string'.")
             'mode-line-buffer-identification
             "   "
             'mode-line-position
+            '(project-mode-line project-mode-line-format)
             '(vc-mode vc-mode)
             "  "
             'mode-line-modes
diff --git a/lisp/progmodes/project.el b/lisp/progmodes/project.el
index 68d5edc482c..9997833ceb1 100644
--- a/lisp/progmodes/project.el
+++ b/lisp/progmodes/project.el
@@ -2010,5 +2010,38 @@ would otherwise have the same name."
           (file-relative-name dirname root))))
     dirname))
 
+;;; Project mode-line
+
+;;;###autoload
+(defcustom project-mode-line nil
+  "Show the current project name with the menu on the mode line.
+This feature requires the presence of the following item in
+`mode-line-format': `(project-mode-line project-mode-line-format)'."
+  :type 'boolean
+  :group 'project
+  :version "30.1")
+
+(defvar project-menu-entry
+  `(menu-item "Project" ,menu-bar-project-menu))
+
+(defvar project-mode-line-map
+  (let ((map (make-sparse-keymap)))
+    (define-key map [mode-line down-mouse-1] project-menu-entry)
+    map))
+
+(defvar project-mode-line-format '(:eval (project-mode-line-format)))
+(put 'project-mode-line-format 'risky-local-variable t)
+
+(defun project-mode-line-format ()
+  "Compose the project mode-line."
+  (when-let ((project (project-current)))
+    (concat
+     " "
+     (propertize
+      (project-name project)
+      'mouse-face 'mode-line-highlight
+      'help-echo "mouse-1: Project menu"
+      'local-map project-mode-line-map))))
+
 (provide 'project)
 ;;; project.el ends here