bug#54228: 29.0.50; project.el: Support local projects

[Manuel Uberti via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

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Hi,

I attached a small patch which simply adds to project.el some code I
have been using for a while for projects that I do not intend to handle with Git.

The gist of it is that adding a `.project` (empty) file to the root
directory of your project make it possible for commands such as 'C-x p f' to 
work on it.

Is this of any interest?

-- 
Manuel Uberti
www.manueluberti.eu

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From 63b29ff98c4914ab55d828146e44d318cc8c0b62 Mon Sep 17 00:00:00 2001
From: Manuel Uberti <manuel.uberti@inventati.org>
Date: Thu, 3 Mar 2022 08:08:16 +0100
Subject: [PATCH] Support local projects

* lisp/progmodes/project.el (project-try-local):
New function.
(project-find-functions):
Use it.
---
 lisp/progmodes/project.el | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/lisp/progmodes/project.el b/lisp/progmodes/project.el
index b44f4618be..4f19e2aaf4 100644
--- a/lisp/progmodes/project.el
+++ b/lisp/progmodes/project.el
@@ -165,7 +165,8 @@ project
   :version "28.1"
   :group 'tools)
 
-(defvar project-find-functions (list #'project-try-vc)
+(defvar project-find-functions (list #'project-try-vc
+                                     #'project-try-local)
   "Special hook to find the project containing a given directory.
 Each functions on this hook is called in turn with one
 argument, the directory in which to look, and should return
@@ -680,6 +681,12 @@ project-buffers
         (push buf bufs)))
     (nreverse bufs)))
 
+(cl-defmethod project-root ((project string))
+  project)
+
+(defun project-try-local (dir)
+  (locate-dominating-file dir ".project"))
+
 \f
 ;;; Project commands
 
-- 
2.25.1