bug#48247: [PATCH] `project--files-in-directory' fails when directory contains spaces

[Jim Porter <jporterbugs@gmail.com>]

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The following happens on Emacs 28.0.50 (or when project.el 0.6.0 has
been installed via GNU ELPA).

Steps to reproduce:

  mkdir "some project"
  cd "some project"
  echo "foobar" > file.txt
  emacs -Q
  C-u C-x p g foo RET RET RET RET

Result:

  project--files-in-directory: File listing failed: find:
‘/home/jim/some’: No such file or directory
  find: ‘project/’: No such file or directory

I think the directory passed to `find' should be shell-quoted. See the
attached patch.

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From 0eb74cafbc8abdabdca49bf35879b8cadc92aa26 Mon Sep 17 00:00:00 2001
From: Jim Porter <jporterbugs@gmail.com>
Date: Wed, 5 May 2021 16:05:25 -0700
Subject: [PATCH] Shell-quote the directory when finding a project's files

* lisp/progmodes/project.el (project--files-in-directory): Shell-quote the
directory.
---
 lisp/progmodes/project.el | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lisp/progmodes/project.el b/lisp/progmodes/project.el
index d47d9d77e6..94a4af78e1 100644
--- a/lisp/progmodes/project.el
+++ b/lisp/progmodes/project.el
@@ -299,8 +299,9 @@ project--files-in-directory
          (localdir (file-name-unquote (file-local-name (expand-file-name dir))))
          (command (format "%s %s %s -type f %s -print0"
                           find-program
-                          ;; In case DIR is a symlink.
-                          (file-name-as-directory localdir)
+                          (shell-quote-argument
+                           ;; In case DIR is a symlink.
+                           (file-name-as-directory localdir))
                           (xref--find-ignores-arguments ignores localdir)
                           (if files
                               (concat (shell-quote-argument "(")
-- 
2.25.1