[groff] 04/27: [eqn]: Implement "reset" primitive/command (2/3).

[G. Branden Robinson]

gbranden pushed a commit to branch master
in repository groff.

commit 9e709d64f7aa5f3c706ef9154e596fbb6a87637a
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
AuthorDate: Sat Aug 26 11:02:04 2023 -0500

    [eqn]: Implement "reset" primitive/command (2/3).
    
    * src/preproc/eqn/eqn.1.man (Customization): Document it.
    
    * NEWS: Add item.
---
 ChangeLog                 |  4 ++++
 NEWS                      |  2 ++
 src/preproc/eqn/eqn.1.man | 10 +++++++++-
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index d3e347d0d..806eab292 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -55,6 +55,10 @@
        * src/preproc/eqn/sqrt.cpp (sqrt_box::compute_metrics): Migrate
        from lvalue access to `get_param()` for parameter retrieval.
 
+       * src/preproc/eqn/eqn.1.man (Customization): Document it.
+
+       * NEWS: Add item.
+
        Fixes <https://savannah.gnu.org/bugs/?62692>.
 
 2023-08-24  G. Branden Robinson <g.branden.robinson@gmail.com>
diff --git a/NEWS b/NEWS
index e8f62b3c1..47208df8e 100644
--- a/NEWS
+++ b/NEWS
@@ -41,6 +41,8 @@ o New parameters tunable with the GNU eqn "set" primitive, 
"half_space"
   their widths were determined by the "thin_space" and "thick_space"
   parameters used to tune GNU eqn's automatic spacing computations.
 
+o The new "reset" primitive restores a named parameter to its default.
+
 Macro packages
 --------------
 
diff --git a/src/preproc/eqn/eqn.1.man b/src/preproc/eqn/eqn.1.man
index 7bfca674c..275c08935 100644
--- a/src/preproc/eqn/eqn.1.man
+++ b/src/preproc/eqn/eqn.1.man
@@ -1101,7 +1101,9 @@ which delegates typesetting to a MathML rendering engine.
 .
 Configure these parameters with the
 .B set
-primitive.
+and
+.B reset
+primitives.
 .
 .
 .TP 9n \" "set p n" + 2n
@@ -1127,6 +1129,12 @@ should assume that the font's x-height is 0.45\~ems.
 .RE
 .
 .
+.TP
+.BI reset\~ p
+restores the default value of
+.RI parameter\~ p.
+.
+.
 .P
 Available parameters
 .I p