Add: (defface org-ql-view-title) Use in -view--header-line-format

Note that we also add a safety check in ORG-QL-VIEW--LINK-FOLLOW,
because the addition of a call to PROPERTIZE in
ORG-QL-VIEW--HEADER-LINE-FORMAT effectively removes what was
functioning as a safety check there (as CONCAT had been signaling an
error for the unsafe argument, whereas PROPERTIZE, which is called to
apply the new face, does not).  We also change the expected error in
the tests accordingly.

README.org

@@ -556,6 +556,9 @@ Simple links may also be written manually in either sexp or non-sexp form, like:
 
 ** 0.9-pre
 
+*Additions*
++ Face ~org-ql-view-title~, applied to view titles in header line.
+
 *Changes*
 + Command ~org-ql-find~ respects narrowing of the current buffer by default, allowing searching within the narrowed region.  (Using one ~C-u~ argument widens the current buffer, and using two ~C-u~ arguments prompts for the buffers to search.)
 + Function ~org-ql-completing-read~ accepts a new ~NARROWP~ argument, which is passed to ~org-ql-select~.

org-ql-view.el

@@ -59,6 +59,10 @@
   "Face for due dates in `org-ql-view' views."
   :group 'org-ql)
 
+(defface org-ql-view-title '((t :weight bold))
+  "View title in header line."
+  :group 'org-ql-view)
+
 ;;;; Variables
 
 (defvar org-ql-view-buffer-name-prefix "*Org QL View:"
@@ -459,7 +463,8 @@ subsequent refreshing of the buffer: `org-ql-view-buffers-files',
 If TITLE, prepend it to the header."
   (let* ((title (if title
                     (concat (propertize "View:" 'face 'transient-argument)
-                            title " ")
+                            (propertize title 'face 'org-ql-view-title)
+                            " ")
                   ""))
          (query-formatted (when query
                             (org-ql-view--format-query query)))
@@ -645,6 +650,8 @@ purposes of compatibility with changes in Org 9.4."
                 (stringp buffers-files)
                 (cl-every #'stringp buffers-files))
       (error "CAUTION: Link not opened because unsafe buffers-files parameter detected: %s" buffers-files))
+    (unless (or (stringp title) (null title))
+      (error "CAUTION: Link not opened because unsafe title parameter detected: %S" title))
     (when (or (listp query)
               (string-match (rx bol (0+ space) "(") query))
       ;; SAFETY: Query is in sexp form: ask for confirmation, because it could contain arbitrary code.

org-ql.info

@@ -1095,6 +1095,9 @@ File: README.info,  Node: 09-pre,  Next: 089,  Up: Changelog
 5.1 0.9-pre
 ===========
 
+*Additions*
+   • Face ‘org-ql-view-title’, applied to view titles in header line.
+
    *Changes*
    • Command ‘org-ql-find’ respects narrowing of the current buffer by
      default, allowing searching within the narrowed region.  (Using one
@@ -2147,53 +2150,53 @@ Node: Links39051
 Node: Tips39738
 Node: Changelog40062
 Node: 09-pre41029
-Node: helm-org-ql (1)41575
-Node: 08941716
-Node: 08842858
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-Node: Development78346
-Node: Copyright assignment78579
-Node: Notes79169
-Node: Comparison with Org Agenda searches79333
-Node: org-sidebar80222
-Node: License80501
+Node: helm-org-ql (1)41667
+Node: 08941808
+Node: 08842950
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+Node: Development78438
+Node: Copyright assignment78671
+Node: Notes79261
+Node: Comparison with Org Agenda searches79425
+Node: org-sidebar80314
+Node: License80593
 
 End Tag Table
 

tests/test-org-ql.el

@@ -1986,13 +1986,13 @@ with keyword arg NOW in PLIST."
                 (expression-link "[[org-ql-search:todo:?title%3D%28error%20%22UNSAFE%22%29]]"))
           (it "Errors for a quoted lambda"
             (expect (open-link quoted-lambda-link)
-                    :to-throw 'wrong-type-argument '(characterp lambda)))
+                    :to-throw 'error '("CAUTION: Link not opened because unsafe title parameter detected: (lambda (_ _) (error \"UNSAFE\"))")))
           (it "Errors for an unquoted lambda"
             (expect (open-link unquoted-lambda-link)
-                    :to-throw 'wrong-type-argument '(characterp lambda)))
+                    :to-throw 'error '("CAUTION: Link not opened because unsafe title parameter detected: (lambda (_ _) (error \"UNSAFE\"))")))
           (it "Errors for an expression"
             (expect (open-link expression-link)
-                    :to-throw 'wrong-type-argument '(characterp error))))
+                    :to-throw 'error '("CAUTION: Link not opened because unsafe title parameter detected: (error \"UNSAFE\")"))))
 
         (describe "sort parameter"
           :var ((quoted-lambda-link "[[org-ql-search:todo:?sort%3D%28lambda%20%28_%20_%29%20%28error%20%22UNSAFE%22%29%29]]")