[groff] 05/05: devlatin1: Map \(oq to ' on output.

[G. Branden Robinson]

gbranden pushed a commit to branch master
in repository groff.

commit 2e2d302aa7bce88bad9b05f24db22b4727957f69
Author: G. Branden Robinson <address@hidden>
Date:   Fri Jun 28 03:26:57 2019 +1000

    devlatin1: Map \(oq to ' on output.
    
    font/devlatin1/R.proto: Render the output glyph \[oq] {opening quote} as
    0x27 (apostrophe) instead of 0x60 (grave accent).  A grave accent is
    just flat wrong for the Latin-1 character set, a.k.a. ISO 8859-1.  The
    defining document ECMA-94 {June 1986} is freely available for perusal.
    The ECMA-94 Latin character sets do not define any glyphs for
    directional {"typographer's"} quotation marks, but the apostrophe is
    depicted as a neutral (vertical) glyph, whereas the grave accent 0x60
    and acute accent 0xB4 are mirror-symmetric diacritical marks.
    
    Note that this change has no effect on _input_ conventions for roff
    source documents.  You can still get directional single quotes on UTF-8,
    PostScript, PDF, and other output devices supporting them by typing
    sequences like `this' in the input {character remapping with ".char"
    requests and similar notwithstanding}.
    
    Patch and idea from Ingo Schwarze, who originally proposed it for ASCII
    as well, and included Latin-1 for parallelism.  The groff developers
    could reach no consensus about the wisdom of such a change for ASCII
    (which was designed to support ambiguity for some code points, requiring
    the development of supplementary interpretation conventions between
    parties).  ECMA-94/ISO-8559 is more strongly prescriptive.
    
    See https://savannah.gnu.org/bugs/?55616 and the groff mailing list
    archives for 31 January to 23 February 2019 at
    https://lists.gnu.org/archive/html/groff for lengthy discussion.
---
 ChangeLog              | 39 +++++++++++++++++++++++++++++++++++++++
 NEWS                   | 20 +++++++++++++++++++-
 font/devlatin1/R.proto |  2 +-
 3 files changed, 59 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 44b2cff..d44bb27 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,44 @@
 2019-06-28  G. Branden Robinson <address@hidden>
 
+       devlatin1: Map \(oq to ' on output.
+
+       * font/devlatin1/R.proto: Render the output glyph \[oq]
+       {opening quote} as 0x27 (apostrophe) instead of 0x60 (grave
+       accent).  A grave accent is just flat wrong for the Latin-1
+       character set, a.k.a. ISO 8859-1.  The defining document ECMA-94
+       {June 1986} is freely available for perusal.  The ECMA-94 Latin
+       character sets do not define any glyphs for directional
+       {"typographer's"} quotation marks, but the apostrophe is
+       depicted as a neutral (vertical) glyph, whereas the grave accent
+       0x60 and acute accent 0xB4 are mirror-symmetric diacritical
+       marks.
+
+       Note that this change has no effect on _input_ conventions for
+       roff source documents.  You can still get directional single
+       quotes on UTF-8, PostScript, PDF, and other output devices
+       supporting them by typing sequences like `this' in the input
+       {character remapping with ".char" requests and similar
+       notwithstanding}.
+
+       Patch and idea from Ingo Schwarze, who originally proposed it
+       for ASCII as well, and included Latin-1 for parallelism.
+       The groff developers could reach no consensus about the wisdom
+       of such a change for ASCII (which was designed to support
+       ambiguity for some code points, requiring the development of
+       supplementary interpretation conventions between parties).
+       ECMA-94/ISO-8559 is more strongly prescriptive.
+
+       See https://savannah.gnu.org/bugs/?55616 and the groff mailing
+       list archives for 31 January to 23 February 2019 at
+       https://lists.gnu.org/archive/html/groff for lengthy discussion.
+
+       * src/roff/groff/tests/on-latin1-device-oq-is-0x27.sh: Check for
+       correct output glyph.
+
+       * src/roff/groff/groff.am: Add test.
+
+2019-06-28  G. Branden Robinson <address@hidden>
+
        * tmac/unicode.tmac: Execute in compatibility mode since the
        script uses a GNU extension (.char).
 
diff --git a/NEWS b/NEWS
index 1adb2a1..636804e 100644
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,4 @@
-    Copyright (C) 1992-2018 Free Software Foundation, Inc.
+    Copyright (C) 1992-2019 Free Software Foundation, Inc.
 
     Copying and distribution of this file, with or without modification,
     are permitted in any medium without royalty provided the copyright
@@ -7,6 +7,24 @@
 This file describes recent user-visible changes in groff.  Bug fixes are not
 described.  There are more details in the man and info pages.
 
+VERSION 1.22.5
+==============
+
+Troff
+-----
+o On the Latin-1 output device ("groff -T latin1") the output glyph \[oq]
+  (opening quote) is now rendered as code point 0x27 (apostrophe) instead of
+  0x60 (grave accent).  The ECMA-94 Latin character sets do not define any
+  glyphs for directional ("typographer's") quotation marks, but the
+  apostrophe is depicted as a neutral (vertical) glyph, whereas the grave
+  accent 0x60 and acute accent 0xB4 are mirror-symmetric diacritical marks.
+
+  Note that this change has no effect on _input_ conventions for roff source
+  documents.  You can still get directional single quotes on UTF-8,
+  PostScript, PDF, and other output devices supporting them by typing
+  sequences like `this' in the input (character remapping with ".char"
+  requests and similar notwithstanding).
+
 
 VERSION 1.22.4
 ==============
diff --git a/font/devlatin1/R.proto b/font/devlatin1/R.proto
index ff33356..a8d093a 100644
--- a/font/devlatin1/R.proto
+++ b/font/devlatin1/R.proto
@@ -48,6 +48,7 @@ Do    "
 '      24      0       0047
 fm     "
 aq     "
+oq     "
 cq     "
 (      24      0       0050
 )      24      0       0051
@@ -142,7 +143,6 @@ _   24      0       0137
 ru     "
 ul     "
 `      24      0       0140
-oq     "
 ga     "
 a      24      0       0141
 b      24      0       0142