fix: scan the deck buffer, not the dashboard, in the statistics viewsHEADmain

With the default file scope, the dashboard rendered and exported from its own buffer, so every count read zero and cards.csv came out empty. The render, refresh, cycle, and CSV-export paths now run their card scans in the deck buffer the command was invoked from, stored buffer-locally, and a dead deck signals a clear user-error instead of scanning the wrong buffer.

Card links are now a registered org-drill-card link type with a follow handler, and the link path carries the file identity so RET jumps work across files. Eleven new ERT tests cover the render, refresh, export, link, and dead-buffer paths.

2 files changed, 181 insertions, 5 deletions

diff --git a/tests/test-org-drill-statistics-render-attention.el b/tests/test-org-drill-statistics-render-attention.el
index b3f2375..4adcfcc 100644
--- a/tests/test-org-drill-statistics-render-attention.el
+++ b/tests/test-org-drill-statistics-render-attention.el
@@ -65,8 +65,9 @@ current time so the fixture never hardcodes today."
     (test-org-drill-stats--attn-fixture)
     (let ((out (org-drill-statistics--render-attention 'file)))
       (should (string-match-p "| Card |" out))
-      (should (string-match-p "\\[\\[org-drill-card:[0-9]+\\]\\[Leech 00\\]\\]"
-                              out)))))
+      (should (string-match-p
+               "\\[\\[org-drill-card:[0-9]+@[^]]*\\]\\[Leech 00\\]\\]"
+               out)))))
 
 (ert-deftest test-org-drill-statistics-attention-cap-and-footer ()
   "Twelve leeches over a 10 cap show 10 rows and a +2 more footer."
@@ -126,15 +127,16 @@ current time so the fixture never hardcodes today."
 (ert-deftest test-org-drill-statistics-card-link-sanitizes-brackets ()
   "Closing brackets in a heading cannot terminate the link early."
   (let ((link (org-drill-statistics--card-link "a]] b" 42)))
-    (should (string-prefix-p "[[org-drill-card:42][" link))
+    (should (string-prefix-p "[[org-drill-card:42@][" link))
     (should (string-suffix-p "]]" link))
     (should-not (string-match-p "a]] b" link))))
 
 (ert-deftest test-org-drill-statistics-card-link-empty-heading-fallback ()
   "An empty heading falls back to a position-based description."
   (let ((link (org-drill-statistics--card-link "" 99)))
-    (should (string-match-p "\\[\\[org-drill-card:99\\]\\[card at 99\\]\\]"
-                            link))))
+    (should (string-match-p
+             "\\[\\[org-drill-card:99@[^]]*\\]\\[card at 99\\]\\]"
+             link))))
 
 (provide 'test-org-drill-statistics-render-attention)
 
diff --git a/tests/test-org-drill-statistics-source-buffer.el b/tests/test-org-drill-statistics-source-buffer.el
new file mode 100644
index 0000000..5732b63
--- /dev/null
+++ b/tests/test-org-drill-statistics-source-buffer.el
@@ -0,0 +1,174 @@
+;;; test-org-drill-statistics-source-buffer.el --- Dashboard source-buffer tests  -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; ERT tests for the statistics dashboard's source-buffer plumbing and
+;; the org-drill-card link type.  The dashboard must scan the deck the
+;; command was invoked from, not its own buffer, and its card links must
+;; be followable.
+
+;;; Code:
+
+(require 'ert)
+(require 'org-drill)
+(require 'org)
+
+(defmacro org-drill-statistics-source-test--with-deck (var &rest body)
+  "Run BODY with VAR bound to a live org deck buffer holding two drill cards."
+  (declare (indent 1))
+  `(let ((,var (generate-new-buffer "*source-deck*")))
+     (unwind-protect
+         (with-current-buffer ,var
+           (org-mode)
+           (insert "* Card one :drill:\nBody one.\n"
+                   "* Card two :drill:\nBody two.\n")
+           (goto-char (point-min))
+           ,@body)
+       (when (buffer-live-p ,var) (kill-buffer ,var)))))
+
+;;; Normal cases
+
+(ert-deftest test-org-drill-statistics-render-counts-source-deck-cards ()
+  "Rendering into the dashboard counts the cards of the source deck.
+With the default file scope, the card scans must run in the source
+buffer, not the dashboard buffer being rendered into."
+  (org-drill-statistics-source-test--with-deck deck
+    (let ((dash (generate-new-buffer "*dash-test*"))
+          (org-drill-scope 'file)
+          (org-drill-session-log nil))
+      (unwind-protect
+          (progn
+            (with-current-buffer dash (org-mode))
+            (org-drill-statistics--render dash 'file "last 90d" nil deck)
+            (with-current-buffer dash
+              (goto-char (point-min))
+              ;; Overview table data row: | total | new | mature | lapsed |
+              (should (search-forward "| 2 | " nil t))))
+        (kill-buffer dash)))))
+
+(ert-deftest test-org-drill-statistics-refresh-uses-stored-source ()
+  "Refresh from inside the dashboard re-scans the stored source deck."
+  (org-drill-statistics-source-test--with-deck deck
+    (let ((dash (generate-new-buffer "*dash-test*"))
+          (org-drill-scope 'file)
+          (org-drill-session-log nil))
+      (unwind-protect
+          (progn
+            (with-current-buffer dash (org-mode))
+            (org-drill-statistics--render dash 'file "last 90d" nil deck)
+            (with-current-buffer dash
+              (org-drill-statistics-refresh)
+              (goto-char (point-min))
+              (should (search-forward "| 2 | " nil t))))
+        (kill-buffer dash)))))
+
+(ert-deftest test-org-drill-statistics-card-link-type-is-registered ()
+  "The org-drill-card link type has a follow handler registered."
+  (should (functionp (org-link-get-parameter "org-drill-card" :follow))))
+
+(ert-deftest test-org-drill-statistics-card-link-encodes-file ()
+  "Card links carry the file identity after the position."
+  (let ((link (org-drill-statistics--card-link "Heading" 42 "/tmp/deck.org")))
+    (should (string-prefix-p "[[org-drill-card:42@/tmp/deck.org][" link))))
+
+(ert-deftest test-org-drill-statistics-follow-jumps-to-file-position ()
+  "Following a card link visits the file and moves point to the position."
+  (let* ((file (make-temp-file "org-drill-follow-test" nil ".org"
+                               "* Card one :drill:\nBody.\n"))
+         (buf nil))
+    (unwind-protect
+        (progn
+          (org-drill-statistics--follow-card-link (format "1@%s" file))
+          (setq buf (current-buffer))
+          (should (equal (buffer-file-name) file))
+          (should (= (point) 1)))
+      (when (and buf (buffer-live-p buf)) (kill-buffer buf))
+      (delete-file file))))
+
+;;; Boundary cases
+
+(ert-deftest test-org-drill-statistics-render-empty-deck-counts-zero ()
+  "An empty source deck renders a zero-card overview, not an error."
+  (let ((deck (generate-new-buffer "*empty-deck*"))
+        (dash (generate-new-buffer "*dash-test*"))
+        (org-drill-scope 'file)
+        (org-drill-session-log nil))
+    (unwind-protect
+        (progn
+          (with-current-buffer deck (org-mode))
+          (with-current-buffer dash (org-mode))
+          (org-drill-statistics--render dash 'file "last 90d" nil deck)
+          (with-current-buffer dash
+            (goto-char (point-min))
+            (should (search-forward "| 0 | " nil t))))
+      (kill-buffer deck)
+      (kill-buffer dash))))
+
+(ert-deftest test-org-drill-statistics-card-link-empty-file-omits-identity ()
+  "A card link built with no file still carries the position."
+  (let ((link (org-drill-statistics--card-link "Heading" 7 nil)))
+    (should (string-prefix-p "[[org-drill-card:7@][" link))))
+
+(ert-deftest test-org-drill-statistics-export-cards-from-source-deck ()
+  "CSV export scans the stored source deck, not the dashboard buffer."
+  (org-drill-statistics-source-test--with-deck deck
+    (let ((dash (generate-new-buffer "*dash-test*"))
+          (dir (make-temp-file "org-drill-export-test" t))
+          (org-drill-scope 'file)
+          (org-drill-session-log nil))
+      (unwind-protect
+          (progn
+            (with-current-buffer dash (org-mode))
+            (org-drill-statistics--render dash 'file "last 90d" nil deck)
+            (with-current-buffer dash
+              (org-drill-statistics-export-csv dir))
+            (with-temp-buffer
+              (insert-file-contents (expand-file-name "cards.csv" dir))
+              ;; Header plus one row per deck card.
+              (should (= 3 (count-lines (point-min) (point-max))))))
+        (kill-buffer dash)
+        (delete-directory dir t)))))
+
+(ert-deftest test-org-drill-statistics-follow-clamps-position-floor ()
+  "A zero or garbage position clamps to buffer start instead of erroring."
+  (let* ((file (make-temp-file "org-drill-follow-clamp" nil ".org"
+                               "* Card :drill:\n"))
+         (buf nil))
+    (unwind-protect
+        (progn
+          (org-drill-statistics--follow-card-link (format "0@%s" file))
+          (setq buf (current-buffer))
+          (should (= (point) 1)))
+      (when (and buf (buffer-live-p buf)) (kill-buffer buf))
+      (delete-file file))))
+
+;;; Error cases
+
+(ert-deftest test-org-drill-statistics-refresh-dead-source-signals-user-error ()
+  "Refresh after the source deck is killed signals a clear user-error."
+  (let ((dash (generate-new-buffer "*dash-test*"))
+        (deck (generate-new-buffer "*doomed-deck*"))
+        (org-drill-scope 'file)
+        (org-drill-session-log nil))
+    (unwind-protect
+        (progn
+          (with-current-buffer deck
+            (org-mode)
+            (insert "* Card :drill:\n"))
+          (with-current-buffer dash (org-mode))
+          (org-drill-statistics--render dash 'file "last 90d" nil deck)
+          (kill-buffer deck)
+          (with-current-buffer dash
+            (should-error (org-drill-statistics-refresh)
+                          :type 'user-error)))
+      (when (buffer-live-p deck) (kill-buffer deck))
+      (kill-buffer dash))))
+
+(ert-deftest test-org-drill-statistics-follow-dead-source-signals-user-error ()
+  "Following a bufferless link with no live source signals a user-error."
+  (with-temp-buffer
+    ;; No dashboard source var set in this buffer; empty file identity.
+    (should-error (org-drill-statistics--follow-card-link "5@")
+                  :type 'user-error)))
+
+(provide 'test-org-drill-statistics-source-buffer)
+;;; test-org-drill-statistics-source-buffer.el ends here