gbranden pushed a commit to branch master
in repository groff.
commit 2a5c3bdf13b1bf3a6ed14c1c3ce8c1e98aafecd1
Author: G. Branden Robinson <[email protected]>
AuthorDate: Mon Jan 19 12:54:45 2026 -0600
groff_diff(7): Speak more precisely of \n[.[xy]].
GNU troff didn't _invent_ the `.x` and `.y` registers, but _did_ apply
semantics to that which AT&T troff "reserved".
Thanks to Dave Kemper for the report.
https://lists.gnu.org/archive/html/groff/2026-01/msg00069.html
---
man/groff_diff.7.man | 72 +++++++++++++++++++++++++++++++++-------------------
1 file changed, 46 insertions(+), 26 deletions(-)
diff --git a/man/groff_diff.7.man b/man/groff_diff.7.man
index 0269fc64b..8593cc64a 100644
--- a/man/groff_diff.7.man
+++ b/man/groff_diff.7.man
@@ -4764,6 +4764,16 @@ in copy mode.
.SS "Altered registers"
.\" ====================================================================
.
+GNU
+.I troff \" GNU
+alters the semantics of two
+AT&T
+.I troff \" AT&T
+registers
+and imparts semantics to two others
+that CSTR\~#54 documented as \[lq]reserved\[rq].
+.
+.
.TP
.B \[rs]n[.R]
Because GNU
@@ -4789,6 +4799,36 @@ it interpolates the type size in typographical points,
which can be represented as a decimal fraction.
.
.
+.TP
+.B \[rs]n[.x]
+Interpolate major version number of the running
+.I @g@troff
+formatter.
+.
+For example,
+if the version number is 1.23.0,
+then
+.B \[rs]n[.x]
+contains\~1.
+.
+.
+.TP
+.B \[rs]n[.y]
+Interpolate minor version number of the running
+.I @g@troff
+formatter.
+.
+For example,
+if the version number is 1.23.0,
+then
+.B \[rs]n[.y]
+contains\~23.
+.
+Also see
+.B \[rs]n[.Y]
+below.
+.
+.
.\" ====================================================================
.SS "New registers"
.\" ====================================================================
@@ -5229,32 +5269,6 @@ See section \[lq]Warnings\[rq] of
.
.
.TP
-.B \[rs]n[.x]
-Interpolate major version number of the running
-.I @g@troff
-formatter.
-.
-For example,
-if the version number is 1.23.0,
-then
-.B \[rs]n[.x]
-contains\~1.
-.
-.
-.TP
-.B \[rs]n[.y]
-Interpolate minor version number of the running
-.I @g@troff
-formatter.
-.
-For example,
-if the version number is 1.23.0,
-then
-.B \[rs]n[.y]
-contains\~23.
-.
-.
-.TP
.B \[rs]n[.Y]
Interpolate revision number of the running
.I @g@troff
@@ -5266,6 +5280,12 @@ then
.B \[rs]n[.Y]
contains\~0.
.
+Also see
+.B \[rs]n[.x]
+and
+.B \[rs]n[.y]
+above.
+.
.
.TP
.B \[rs]n[.zoom]
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