[groff] 16/26: [mdoc]: Throw diagnostic if "-Thtml -rD1".

[G. Branden Robinson]

gbranden pushed a commit to branch master
in repository groff.

commit 994bc0a8ca336bad02a814a590bef2faea652894
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
AuthorDate: Sat Dec 17 19:35:38 2022 -0600

    [mdoc]: Throw diagnostic if "-Thtml -rD1".
    
    * tmac/doc.tmac: Inform user we're ignoring their "-rD1" setting if also
      formatting HTML; parallels groff man(7) behavior.
---
 ChangeLog     |  5 +++++
 tmac/doc.tmac | 11 +++++++++--
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 0f7e330a8..26e3860b3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2022-12-17  G. Branden Robinson <g.branden.robinson@gmail.com>
+
+       * tmac/doc.tmac: Inform user we're ignoring their "-rD1" setting
+       if also formatting HTML; parallels groff man(7) behavior.
+
 2022-12-17  G. Branden Robinson <g.branden.robinson@gmail.com>
 
        * tmac/doc.tmac: Trivially refactor.  Relocate handling of `D`
diff --git a/tmac/doc.tmac b/tmac/doc.tmac
index 9ec04ac77..4edc408f6 100644
--- a/tmac/doc.tmac
+++ b/tmac/doc.tmac
@@ -107,8 +107,15 @@
 .el \
 .  nr 3usekeeps 1
 .
-.\" Use -rD=1 for double-sided printing.
-.if !r D .nr D 0
+.\" double-sided layout
+.ie !r D \
+.  nr D 0
+.el \
+.  if \n[D] \
+.    if \n[doc-is-output-html] \{\
+.       tm mdoc: ignoring double-sided layout in HTML output
+.       nr D 0
+.    \}
 .
 .\" TODO: Implement HF string.
 .