[groff] 25/35: [troff]: Throw warning when ignoring font change.

[G. Branden Robinson]

gbranden pushed a commit to branch master
in repository groff.

commit 0effe118480aac910c2826b11ec33f0566532a4d
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
AuthorDate: Mon Jun 20 17:31:35 2022 -0500

    [troff]: Throw warning when ignoring font change.
    
    [troff]: Throw warning in font category when a font selection escape
    sequence is used after the output line continuation escape sequence on
    an input line, because it is ignored.
    
    * src/roff/troff/env.cpp (environment::set_font): Do it.
    
    * doc/groff.texi (Warnings):
    * src/roff/troff/troff.1.man (Warnings): Document it.
---
 ChangeLog                  | 11 +++++++++++
 doc/groff.texi             |  5 ++++-
 src/roff/troff/env.cpp     |  4 +++-
 src/roff/troff/troff.1.man |  5 ++++-
 4 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index b11b7c0e..88b5f74c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,14 @@
+2022-06-20  G. Branden Robinson <g.branden.robinson@gmail.com>
+
+       [troff]: Throw warning in font category when a font selection
+       escape sequence is used after the output line continuation
+       escape sequence on an input line, because it is ignored.
+
+       * src/roff/troff/env.cpp (environment::set_font): Do it.
+
+       * doc/groff.texi (Warnings):
+       * src/roff/troff/troff.1.man (Warnings): Document it.
+
 2022-06-20  G. Branden Robinson <g.branden.robinson@gmail.com>
 
        * src/roff/troff/env.cpp (font_change): Boolify.
diff --git a/doc/groff.texi b/doc/groff.texi
index dedc5d8c..0507d65e 100644
--- a/doc/groff.texi
+++ b/doc/groff.texi
@@ -16366,7 +16366,10 @@ occurs in compatibility mode.
 
 @item font
 @itemx 131072
-A non-existent font was selected.  This category is enabled by default.
+A non-existent font was selected, or the selection was ignored because a
+font selection escape sequence was used after the output line
+continuation escape sequence on an input line.  This category is enabled
+by default.
 
 @item ig
 @itemx 262144
diff --git a/src/roff/troff/env.cpp b/src/roff/troff/env.cpp
index 5a6f85d1..a56f07b3 100644
--- a/src/roff/troff/env.cpp
+++ b/src/roff/troff/env.cpp
@@ -498,8 +498,10 @@ static node *do_underline_special(bool do_underline_spaces)
 
 bool environment::set_font(symbol nm)
 {
-  if (interrupted)
+  if (interrupted) {
+    warning(WARN_FONT, "ignoring font selection on interrupted line");
     return true; // "no operation" is successful
+  }
   if (nm == symbol("P") || nm.is_empty()) {
     if (family->make_definite(prev_fontno) < 0)
       return false;
diff --git a/src/roff/troff/troff.1.man b/src/roff/troff/troff.1.man
index 042e56a2..f2830ac5 100644
--- a/src/roff/troff/troff.1.man
+++ b/src/roff/troff/troff.1.man
@@ -579,7 +579,10 @@ This category is enabled by default.
 .
 .TP
 .BR font "\t131072"
-A non-existent font was selected.
+A non-existent font was selected,
+or the selection was ignored because a font selection escape sequence
+was used after the output line continuation escape sequence on an input
+line.
 .
 This category is enabled by default.
 .