[groff] 13/14: contrib/mm/m.tmac: Add code comments.

[G. Branden Robinson]

gbranden pushed a commit to branch master
in repository groff.

commit 0fd52043f3066b39266fbdacd2fa36df61fe2a18
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
AuthorDate: Fri Jan 6 13:51:57 2023 -0600

    contrib/mm/m.tmac: Add code comments.
---
 contrib/mm/m.tmac | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/contrib/mm/m.tmac b/contrib/mm/m.tmac
index c38ba983b..b849f750c 100644
--- a/contrib/mm/m.tmac
+++ b/contrib/mm/m.tmac
@@ -379,6 +379,7 @@ Index               array!index
 .\"---------------------------------------------
 .\" ####### module init ######
 .\"    reset all things
+.\" XXX: Resets .cu and .ul but _not_ .ce or .rj.
 .de init@reset
 .ie \\n[misc@adjust] 'ad
 .el 'na
@@ -508,12 +509,21 @@ in=\\n[.i] fi=\\n[.u] .d=\\n[.d] nl=\\n[nl] pg=\\n[%]
 .nr line*lp\\n[.z] \\n[.d]
 ..
 .\" ######## module misc ###############
+.\" XXX: This register value is meaningless.
+.\"   .ad b
+.\"   .nr misc@adjust \n[.j]
+.\" might be better...
 .nr misc@adjust 14
 .de SA
 .if \\n[.$] \{\
 .      if \\$1-1 .@error "SA: bad arg: \\$1"
+.\" XXX: ...then...
+.\"   .ad l
+.\"   .nr misc@adjust \\n[.j]
 .      nr misc@adjust 0\\$1
 .\}
+.\" XXX: ...and finally an unconditional.
+.\"   .ad \\n[.j]
 .ie \\n[misc@adjust] 'ad
 .el 'na
 ..