Implement `%U' in mdoc for URL references.

* tmac/doc-common (%U): New register.
(Rd): Handle `doc-url-count' and `doc-url-name'.

* tmac/doc.tmac (doc-url-count, doc-url-name): New registers.
(doc-save-global-vars, doc-restore-global-vars, doc-reset-reference,
doc-print-reference): Handle `doc-url-count' and `doc-url-name'.
(%U): New macro.

* NEWS, tmac/groff_mdoc.man: Document `%U' macro.

1 files changed, 70 insertions, 1 deletions

diff --git a/tmac/doc.tmac b/tmac/doc.tmac
index 2ad39895..017835e0 100644
--- a/tmac/doc.tmac
+++ b/tmac/doc.tmac
@@ -3430,6 +3430,8 @@
 .  nr doc-reference-title-count-saved \n[doc-reference-title-count]
 .  ds doc-reference-title-name-saved "\*[doc-reference-title-name]
 .  ds doc-reference-title-name-for-book-saved "\*[doc-reference-title-name-for-book]
+.  nr doc-url-count-saved \n[doc-url-count]
+.  ds doc-url-name-saved "\*[doc-url-name]
 .  nr doc-volume-count-saved \n[doc-volume-count]
 .  ds doc-volume-name-saved "\*[doc-volume-name]
 .  nr doc-have-author-saved \n[doc-have-author]
@@ -3570,6 +3572,8 @@
 .  nr doc-reference-title-count \n[doc-reference-title-count-saved]
 .  ds doc-reference-title-name "\*[doc-reference-title-name-saved]
 .  ds doc-reference-title-name-for-book "\*[doc-reference-title-name-for-book-saved]
+.  nr doc-url-count \n[doc-url-count-saved]
+.  ds doc-url-name "\*[doc-url-name-saved]
 .  nr doc-volume-count \n[doc-volume-count-saved]
 .  ds doc-volume-name "\*[doc-volume-name-saved]
 .  nr doc-have-author \n[doc-have-author-saved]
@@ -5194,6 +5198,8 @@
 .\" NS   doc-reference-title-name-for-book
 .\" NS   doc-report-count
 .\" NS   doc-report-name
+.\" NS   doc-url-count
+.\" NS   doc-url-name
 .\" NS   doc-volume-count
 .\" NS   doc-volume-name
 .
@@ -5208,6 +5214,7 @@
 .  nr doc-corporate-count 0
 .  nr doc-report-count 0
 .  nr doc-reference-title-count 0
+.  nr doc-url-count 0
 .  nr doc-volume-count 0
 .  nr doc-date-count 0
 .  nr doc-page-number-count 0
@@ -5222,6 +5229,7 @@
 .  ds doc-report-name
 .  ds doc-reference-title-name
 .  ds doc-reference-title-name-for-book
+.  ds doc-url-name
 .  ds doc-volume-name
 .  ds doc-date
 .  ds doc-page-number-string
@@ -5316,6 +5324,13 @@
 .    doc-finish-reference \n[doc-volume-count]
 .  \}
 .
+.  if \n[doc-url-count] \{\
+.    unformat doc-url-name
+.    chop doc-url-name
+.    nop \*[doc-url-name]\c
+.    doc-finish-reference \n[doc-url-count]
+.  \}
+.
 .  if \n[doc-page-number-count] \{\
 .    unformat doc-page-number-string
 .    chop doc-page-number-string
@@ -6019,6 +6034,18 @@
 ..
 .
 .
+.\" NS doc-url-count global register
+.\" NS   counter of hypertext references
+.
+.nr doc-url-count 0
+.
+.
+.\" NS doc-url-name global box
+.\" NS   string of collected hypertext references
+.
+.ds doc-url-name
+.
+.
 .\" NS doc-volume-count global register
 .\" NS   counter of reference title references
 .
@@ -6031,6 +6058,48 @@
 .ds doc-volume-name
 .
 .
+.\" NS %U user macro
+.\" NS   hypertext reference
+.\" NS
+.\" NS modifies:
+.\" NS   doc-arg-ptr
+.\" NS   doc-curr-font
+.\" NS   doc-curr-size
+.\" NS   doc-macro-name
+.\" NS   doc-reference-count
+.\" NS   doc-url-count
+.\" NS
+.\" NS local variables:
+.\" NS   doc-env-%U
+.\" NS
+.\" NS width register `%U' set in doc-common
+.
+.de %U
+.  if (\n[doc-arg-limit] : (\n[.$] == 0)) \{\
+.    tm Usage: .%U URL ... (#\n[.c])
+.    return
+.  \}
+.
+.  nr doc-url-count +1
+.  nr doc-reference-count +1
+.
+.  ds doc-macro-name %U
+.  doc-parse-args \$@
+.
+.  nr doc-arg-ptr +1
+.  nr doc-curr-font \n[.f]
+.  nr doc-curr-size \n[.ps]
+.
+.  \" append to reference box
+.  boxa doc-url-name
+.  ev doc-env-%U
+.  evc 0
+.  in 0
+.  nf
+.  doc-do-references
+..
+.
+.
 .\" NS %V user macro
 .\" NS   reference volume
 .\" NS
@@ -6039,7 +6108,7 @@
 .\" NS   doc-curr-font
 .\" NS   doc-curr-size
 .\" NS   doc-macro-name
-.\" NS   doc-reference-title-count
+.\" NS   doc-reference-count
 .\" NS   doc-volume-count
 .\" NS
 .\" NS local variables: