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master 76f71e3: Make eww use the XDG download directory

From: Lars Ingebrigtsen
Subject: master 76f71e3: Make eww use the XDG download directory
Date: Wed, 29 Jul 2020 01:14:09 -0400 (EDT)

branch: master
commit 76f71e39f583b7f8bb47a47b315f49af6f23886e
Author: Lars Ingebrigtsen <larsi@gnus.org>
Commit: Lars Ingebrigtsen <larsi@gnus.org>

    Make eww use the XDG download directory
    * lisp/net/eww.el (erc--download-directory): New function (bug#41030).
    (eww-download-directory): Use it.
    (eww-download): Use it.
    (eww-download-callback): Adjust parameters.
 doc/misc/eww.texi |  4 +++-
 etc/NEWS          |  5 +++++
 lisp/net/eww.el   | 43 ++++++++++++++++++++++++++++++-------------
 3 files changed, 38 insertions(+), 14 deletions(-)

diff --git a/doc/misc/eww.texi b/doc/misc/eww.texi
index 9bca0fa..f9901b6 100644
--- a/doc/misc/eww.texi
+++ b/doc/misc/eww.texi
@@ -135,7 +135,9 @@ HTML-specified colors or not.  This sets the 
@code{shr-use-colors} variable.
   A URL can be downloaded with @kbd{d} (@code{eww-download}).  This
 will download the link under point if there is one, or else the URL of
 the current page.  The file will be written to the directory specified
-in @code{eww-download-directory} (default: @file{~/Downloads/}).
+by @code{eww-download-directory} (default: @file{~/Downloads/}, if it
+exists; otherwise as specified by the @samp{DOWNLOAD} @acronym{XDG}
 @findex eww-back-url
 @findex eww-forward-url
diff --git a/etc/NEWS b/etc/NEWS
index 650b958..4c77162 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -492,6 +492,11 @@ behavior of rendering as wide as the window-width allows.  
 ** EWW
+*** 'eww-download-directory' will now use the XDG location, if defined.
+However, if ~/Downloads/ already exists, that will continue to be
 *** The command 'eww-follow-link' now supports custom mailto handlers.
 The function that is invoked when clicking on or otherwise following a
diff --git a/lisp/net/eww.el b/lisp/net/eww.el
index f4e3aa3..edb2f72 100644
--- a/lisp/net/eww.el
+++ b/lisp/net/eww.el
@@ -32,6 +32,7 @@
 (require 'thingatpt)
 (require 'url)
 (require 'url-queue)
+(require 'xdg)
 (eval-when-compile (require 'subr-x))
 (defgroup eww nil
@@ -55,11 +56,24 @@
   :group 'eww
   :type 'string)
-(defcustom eww-download-directory "~/Downloads/"
-  "Directory where files will downloaded."
-  :version "24.4"
+(defun erc--download-directory ()
+  "Return the name of the download directory.
+If ~/Downloads/ exists, that will be used, and if not, the
+DOWNLOAD XDG user directory will be returned.  If that's
+undefined, ~/Downloads/ is returned anyway."
+  (or (and (file-exists-p "~/Downloads/")
+           "~/Downloads/")
+      (when-let ((dir (xdg-user-dir "DOWNLOAD")))
+        (file-name-as-directory dir))
+      "~/Downloads/"))
+(defcustom eww-download-directory 'erc--download-directory
+  "Directory where files will downloaded.
+This should either be a directory name or a function (called with
+no parameters) that returns a directory name."
+  :version "28.1"
   :group 'eww
-  :type 'directory)
+  :type '(choice directory function))
 (defcustom eww-suggest-uris
@@ -1632,20 +1646,23 @@ Differences in #targets are ignored."
   "Download URL to `eww-download-directory'.
 Use link at point if there is one, else the current page's URL."
-  (access-file eww-download-directory "Download failed")
-  (let ((url (or (get-text-property (point) 'shr-url)
-                 (eww-current-url))))
-    (if (not url)
-        (message "No URL under point")
-      (url-retrieve url #'eww-download-callback (list url)))))
-(defun eww-download-callback (status url)
+  (let ((dir (if (stringp eww-download-directory)
+                 eww-download-directory
+               (funcall eww-download-directory))))
+    (access-file dir "Download failed")
+    (let ((url (or (get-text-property (point) 'shr-url)
+                   (eww-current-url))))
+      (if (not url)
+          (message "No URL under point")
+        (url-retrieve url #'eww-download-callback (list url dir))))))
+(defun eww-download-callback (status url dir)
   (unless (plist-get status :error)
     (let* ((obj (url-generic-parse-url url))
            (path (directory-file-name (car (url-path-and-query obj))))
            (file (eww-make-unique-file-name
                   (eww-decode-url-file-name (file-name-nondirectory path))
-                  eww-download-directory)))
+                  dir)))
       (goto-char (point-min))
       (re-search-forward "\r?\n\r?\n")
       (let ((coding-system-for-write 'no-conversion))

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