Add erc-sasl-auth-source-function to cached options

* lisp/erc/erc-sasl.el (erc-sasl--read-password): Consult cached
options instead of `erc-sasl-auth-source-function'.
(erc-sasl--init): Add `erc-sasl-auth-source-function' to
`erc-sasl--options'.

* test/lisp/erc/erc-sasl-tests.el (erc-sasl--read-password--basic,
erc-sasl--read-password--auth-source): Look for original value of
`erc-sasl-auth-source-function' in `erc-sasl--options' under the
`authfn' key.

2 files changed, 22 insertions, 19 deletions

diff --git a/lisp/erc/erc-sasl.el b/lisp/erc/erc-sasl.el
index 9084d873ce4..5ee7169de5f 100644
--- a/lisp/erc/erc-sasl.el
+++ b/lisp/erc/erc-sasl.el
@@ -137,10 +137,11 @@ PROMPT is passed to `read-passwd' if necessary."
       ((found (pcase (alist-get 'password erc-sasl--options)
                 (:password erc-session-password)
                 ((and (pred stringp) v) (unless (string-empty-p v) v))
-                ((and (guard erc-sasl-auth-source-function)
-                      v (let host
-                          (or v (erc-networks--id-given erc-networks--id))))
-                 (apply erc-sasl-auth-source-function
+                ((and (let fn (alist-get 'authfn erc-sasl--options))
+                      (guard fn) v
+                      (let host
+                        (or v (erc-networks--id-given erc-networks--id))))
+                 (apply fn
                         :user (erc-sasl--get-user)
                         (and host (list :host (symbol-name host))))))))
       (copy-sequence (erc--unfun found))
@@ -293,6 +294,7 @@ PROMPT is passed to `read-passwd' if necessary."
             `((user . ,erc-sasl-user)
               (password . ,erc-sasl-password)
               (mechanism . ,erc-sasl-mechanism)
+              (authfn . ,erc-sasl-auth-source-function)
               (authzid . ,erc-sasl-authzid)))))
 
 (defun erc-sasl--mechanism-offered-p (offered)
diff --git a/test/lisp/erc/erc-sasl-tests.el b/test/lisp/erc/erc-sasl-tests.el
index 64593ca270c..3e6828ff644 100644
--- a/test/lisp/erc/erc-sasl-tests.el
+++ b/test/lisp/erc/erc-sasl-tests.el
@@ -42,17 +42,17 @@
           (erc-sasl--options '((password . :password))))
       (should (string= (erc-sasl--read-password nil) "foo"))))
 
-  (ert-info ("Fallback to prompt skip auth-source")
-    (should-not erc-sasl-auth-source-function)
-    (let ((erc-session-password "bar")
-          (erc-networks--id (erc-networks--id-create nil)))
+  (ert-info ("Prompt when no authfn and :password resolves to nil")
+    (let ((erc-session-password nil)
+          (erc-sasl--options
+           '((password . :password) (user . :user) (authfn))))
       (should (string= (ert-simulate-keys "bar\r"
                          (erc-sasl--read-password "?"))
                        "bar"))))
 
-  (ert-info ("Prompt when auth-source fails and `erc-sasl-password' null")
-    (let ((erc-sasl--options '((password)))
-          (erc-sasl-auth-source-function #'ignore))
+  (ert-info ("Prompt when auth-source fails and `erc-session-password' null")
+    (should-not erc-session-password)
+    (let ((erc-sasl--options '((password) (authfn . ignore))))
       (should (string= (ert-simulate-keys "baz\r"
                          (erc-sasl--read-password "pwd:"))
                        "baz")))))
@@ -71,36 +71,37 @@
            (erc-session-port 6697)
            (erc-networks--id (erc-networks--id-create nil))
            calls
-           (erc-sasl-auth-source-function
-            (lambda (&rest r)
-              (push r calls)
-              (apply #'erc--auth-source-search r)))
+           (fn (lambda (&rest r)
+                 (push r calls)
+                 (apply #'erc-auth-source-search r)))
            erc-server-announced-name ; too early
            auth-source-do-cache)
 
       (ert-info ("Symbol as password specifies machine")
-        (let ((erc-sasl--options '((user . "bob") (password . FSF.chat)))
+        (let ((erc-sasl--options
+               `((user . "bob") (password . FSF.chat) (authfn . ,fn)))
               (erc-networks--id (make-erc-networks--id)))
           (should (string= (erc-sasl--read-password nil) "sesame"))
           (should (equal (pop calls) '(:user "bob" :host "FSF.chat")))))
 
       (ert-info ("ID for :host and `erc-session-username' for :user") ; *1
         (let ((erc-session-username "bob")
-              (erc-sasl--options '((user . :user) (password)))
+              (erc-sasl--options `((user . :user) (password) (authfn . ,fn)))
               (erc-networks--id (erc-networks--id-create 'GNU/chat)))
           (should (string= (erc-sasl--read-password nil) "spam"))
           (should (equal (pop calls) '(:user "bob" :host "GNU/chat")))))
 
       (ert-info ("ID for :host and current nick for :user") ; *1
         (let ((erc-server-current-nick "bob")
-              (erc-sasl--options '((user . :nick) (password)))
+              (erc-sasl--options `((user . :nick) (password) (authfn . ,fn)))
               (erc-networks--id (erc-networks--id-create 'GNU/chat)))
           (should (string= (erc-sasl--read-password nil) "spam"))
           (should (equal (pop calls) '(:user "bob" :host "GNU/chat")))))
 
       (ert-info ("Symbol as password, entry lacks user field")
         (let ((erc-server-current-nick "fake")
-              (erc-sasl--options '((user . :nick) (password . MyHost)))
+              (erc-sasl--options
+               `((user . :nick) (password . MyHost) (authfn . ,fn)))
               (erc-networks--id (erc-networks--id-create 'GNU/chat)))
           (should (string= (erc-sasl--read-password nil) "123"))
           (should (equal (pop calls) '(:user "fake" :host "MyHost"))))))))