Rudimentary implementation of the roff(7) .while request.

Needed for example by groff_hdtbl(7).

There are two limitations:
It does not support nested .while requests yet,
and each .while loop must start and end in the same scope.

The roff_parseln() return codes are now more flexible
and allow OR'ing options.

1 files changed, 30 insertions, 0 deletions

diff --git a/regress/roff/while/basic.in b/regress/roff/while/basic.in
new file mode 100644
index 00000000..07cd1282
--- /dev/null
+++ b/regress/roff/while/basic.in
@@ -0,0 +1,30 @@
+.\" $OpenBSD: basic.in,v 1.1 2018/08/24 22:56:37 schwarze Exp $
+.Dd $Mdocdate$
+.Dt WHILE-BASIC 1
+.Os
+.Sh NAME
+.Nm while-basic
+.Nd the while request
+.Sh DESCRIPTION
+Loop with single-line scope:
+.nr cnt 11 1
+.de mym
+\\n-[cnt]
+..
+.while \n[cnt] .mym
+.Pp
+Loop with multi-line scope, text line closure:
+.nr cnt 11
+.while \n[cnt] \{\
+.nr cnt -1
+\n[cnt]\},
+boom.
+.Pp
+Loop with multi-line scope, macro line closure:
+.nr cnt 11
+.while \n[cnt] \{\
+.nr cnt -1
+\n[cnt]
+.\}
+.Pp
+final text