Add a new `file' warning category.

* src/roff/troff/troff.h (warning_type): Add WARN_FILE.
* src/roff/troff/input.cpp (DEFAULT_WARNING_MASK): Include
WARN_FILE.
(warning_table): Add `file' category.
(macro_source): Convert error on missing macro file to a
warning.
* NEWS, doc/groff.texinfo (I/O, Warnings), man/groff_diff.man,
src/roff/troff/troff.man: Document new warning category.

3 files changed, 15 insertions, 4 deletions

diff --git a/src/roff/troff/input.cpp b/src/roff/troff/input.cpp
index b3243f5a..98b6e58f 100644
--- a/src/roff/troff/input.cpp
+++ b/src/roff/troff/input.cpp
@@ -59,7 +59,7 @@ extern "C" {
 #ifndef DEFAULT_WARNING_MASK
 // warnings that are enabled by default
 #define DEFAULT_WARNING_MASK \
-     (WARN_CHAR|WARN_NUMBER|WARN_BREAK|WARN_SPACE|WARN_FONT)
+     (WARN_CHAR|WARN_NUMBER|WARN_BREAK|WARN_SPACE|WARN_FONT|WARN_FILE)
 #endif
 
 // initial size of buffer for reading names; expanded as necessary
@@ -7367,7 +7367,7 @@ void macro_source()
       a_delete path;
     }
     else
-      error("can't find macro file `%1'", nm.contents());
+      warning(WARN_FILE, "can't find macro file `%1'", nm.contents());
     tok.next();
   }
 }
@@ -8153,6 +8153,7 @@ static struct {
   { "reg", WARN_REG },
   { "ig", WARN_IG },
   { "color", WARN_COLOR },
+  { "file", WARN_FILE },
   { "all", WARN_TOTAL & ~(WARN_DI | WARN_MAC | WARN_REG) },
   { "w", WARN_TOTAL },
   { "default", DEFAULT_WARNING_MASK },
diff --git a/src/roff/troff/troff.h b/src/roff/troff/troff.h
index ab5db406..79f40891 100644
--- a/src/roff/troff/troff.h
+++ b/src/roff/troff/troff.h
@@ -75,11 +75,12 @@ enum warning_type {
   WARN_SPACE = 0200000,
   WARN_FONT = 0400000,
   WARN_IG =  01000000,
-  WARN_COLOR = 02000000
+  WARN_COLOR = 02000000,
+  WARN_FILE = 04000000
   // change WARN_TOTAL if you add more warning types
 };
 
-const int WARN_TOTAL = 03777777;
+const int WARN_TOTAL = 07777777;
 
 int warning(warning_type, const char *,
 	    const errarg & = empty_errarg,
diff --git a/src/roff/troff/troff.man b/src/roff/troff/troff.man
index 6c53f4d5..f59b73b4 100644
--- a/src/roff/troff/troff.man
+++ b/src/roff/troff/troff.man
@@ -334,6 +334,7 @@ _
 7@128@syntax@17@131072@font
 8@256@di@18@262144@ig
 9@512@mac@19@524288@color
+@@@20@1048576@file
 .TE
 .
 .P
@@ -385,6 +386,14 @@ When an unrecognized escape sequence is encountered, the escape
 character is ignored.
 .
 .TP
+.BR file "\t1048576"
+Indicates a missing file for the
+.B mso
+request.
+.
+Enabled by default.
+.
+.TP
 .BR font "\t131072"
 Non-existent fonts.
 .