コミット: 94c6fe3ee37243597c54429bc537951e01cd6058 - groff-pdfmark (hg)

Reference Documentation: PDF Publishing with GNU Troff

コミットメタ情報

• リビジョン: 94c6fe3ee37243597c54429bc537951e01cd6058 (tree)
• 日時: 2023-04-04 20:41:26
• 作者: Keith Marshall <keith@user...>
• コミッター: Keith Marshall

ログメッセージ

Implement a duplex printing layout capability.

* pdfmark.ms [duplex] (BT): Augment macro definition, to alternate
left and right margin widths, between even and odd numbered pages;
activated by "-duplex" option to pdfroff command, (i.e. define a
string called "uplex", with "-duplex=true", for example).
[duplex && pdfroff] (preserve_blank_pages): Suggest it for...
[body]: ...this document assembly component.

変更サマリ

• modified: pdfmark.ms

差分

diff -r a8e5a103c770 -r 94c6fe3ee372 pdfmark.ms
--- a/pdfmark.ms	Mon Apr 03 22:29:56 2023 +0100
+++ b/pdfmark.ms	Tue Apr 04 12:41:26 2023 +0100
@@ -102,6 +102,39 @@
 .nr QI  3n
 .nr HY  0
 .
+.if duplex \{\
+.\" When duplex printing layout has been specified, we alternate the
+.\" left and right margin settings, as we move from odd to even page
+.\" numbers, and back; groff-ms calls the "BT" hook macro within the
+.\" scope of a bottom-of-page trap, so we may augment this to adjust
+.\" the margins as required.
+.\"
+.   am BT
+.   \" groff doesn't provide any specific indicator for right margin
+.   \" width, or indeed for overall paper width; however, we may get
+.   \" the paper width by inference, from papersize.tmac, which sets
+.   \" it to two inches more than the initial default value of \n(.l
+.   \"
+.   \" When advancing from an odd numbered to an even numbered page,
+.   \" adjust the PO register to the original right margin width, as
+.   \" inferred by subtraction of the original effective left margin
+.   \" setting, as established by the initial setting of PO, and the
+.   \" effective line length, as established by the initial setting
+.   \" of LL, from the inferred paper width.
+.   \"
+.      ie o .nr PO 2i+\n(.lu-\n(POu-\n(LLu
+.
+.   \" Conversely, when advancing from an even numbered page to an
+.   \" odd numbered page, we simple revert PO to its initial value.
+.   \"
+.      el .nr PO \n(POu
+.   .
+.\" Additionally, for duplex printing, it may be best to request the
+.\" preservation of blank pages within the document body.
+.\"
+.   if d pdfroff .pdfroff option preserve_blank_pages=body
+.\}
+.
 .\" Generate headers in larger point sizes, for NH levels < 4,
 .\" with point size increasing by 1.5p, for each lesser NH level.
 .\"