Unicode 6.3 defines more code points as combining or accents.  For
example, the character "ö" could be expressed as an "o" followed by
U+0308 COMBINING DIARESIS (aka umlaut, double-dot-above).  We should
consider that such a sequence of two codepoints occupies one display
column for the alignment purposes, and for that, git_wcwidth()
should return 0 for them.

The following script has been used to generate the combining table
in git_wcwidth():

#!/bin/sh
URLBASE=http://www.unicode.org/Public/UCD/latest/ucd

if ! test -f UnicodeData.txt; then
        wget $URLBASE/UnicodeData.txt
fi &&
if ! test -f EastAsianWidth.txt; then
        wget $URLBASE/EastAsianWidth.txt
fi &&
if ! test -d uniset; then
        mkdir uniset
fi &&
if ! test -e Blocks.txt; then
        ln -s uniset/Blocks.txt
fi &&
(
        cd uniset &&
        if ! test -f uniset.tar.gz; then
                wget http://www.cl.cam.ac.uk/~mgk25/download/uniset.tar.gz
        fi &&
        if ! test -f uniset; then
                tar xzf uniset.tar.gz
        fi
) &&
./uniset/uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c

Helped-by: Kevin Bracey <ke...@bracey.fi>
Signed-off-by: Torsten Bögershausen <tbo...@web.de>
---
 utf8.c | 116 ++++++++++++++++++++++++++++++++++++++++++-----------------------
 1 file changed, 76 insertions(+), 40 deletions(-)

diff --git a/utf8.c b/utf8.c
index 0d20e0a..3a8c282 100644
--- a/utf8.c
+++ b/utf8.c
@@ -84,48 +84,84 @@ static int git_wcwidth(ucs_char_t ch)
         *   "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c".
         */
        static const struct interval combining[] = {
-               { 0x0300, 0x0357 }, { 0x035D, 0x036F }, { 0x0483, 0x0486 },
-               { 0x0488, 0x0489 }, { 0x0591, 0x05A1 }, { 0x05A3, 0x05B9 },
-               { 0x05BB, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
-               { 0x05C4, 0x05C4 }, { 0x0600, 0x0603 }, { 0x0610, 0x0615 },
-               { 0x064B, 0x0658 }, { 0x0670, 0x0670 }, { 0x06D6, 0x06E4 },
-               { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED }, { 0x070F, 0x070F },
-               { 0x0711, 0x0711 }, { 0x0730, 0x074A }, { 0x07A6, 0x07B0 },
-               { 0x0901, 0x0902 }, { 0x093C, 0x093C }, { 0x0941, 0x0948 },
-               { 0x094D, 0x094D }, { 0x0951, 0x0954 }, { 0x0962, 0x0963 },
-               { 0x0981, 0x0981 }, { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 },
-               { 0x09CD, 0x09CD }, { 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 },
-               { 0x0A3C, 0x0A3C }, { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 },
-               { 0x0A4B, 0x0A4D }, { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 },
+               { 0x0300, 0x036F }, { 0x0483, 0x0489 }, { 0x0591, 0x05BD },
+               { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 }, { 0x05C4, 0x05C5 },
+               { 0x05C7, 0x05C7 }, { 0x0600, 0x0604 }, { 0x0610, 0x061A },
+               { 0x061C, 0x061C }, { 0x064B, 0x065F }, { 0x0670, 0x0670 },
+               { 0x06D6, 0x06DD }, { 0x06DF, 0x06E4 }, { 0x06E7, 0x06E8 },
+               { 0x06EA, 0x06ED }, { 0x070F, 0x070F }, { 0x0711, 0x0711 },
+               { 0x0730, 0x074A }, { 0x07A6, 0x07B0 }, { 0x07EB, 0x07F3 },
+               { 0x0816, 0x0819 }, { 0x081B, 0x0823 }, { 0x0825, 0x0827 },
+               { 0x0829, 0x082D }, { 0x0859, 0x085B }, { 0x08E4, 0x08FE },
+               { 0x0900, 0x0902 }, { 0x093A, 0x093A }, { 0x093C, 0x093C },
+               { 0x0941, 0x0948 }, { 0x094D, 0x094D }, { 0x0951, 0x0957 },
+               { 0x0962, 0x0963 }, { 0x0981, 0x0981 }, { 0x09BC, 0x09BC },
+               { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD }, { 0x09E2, 0x09E3 },
+               { 0x0A01, 0x0A02 }, { 0x0A3C, 0x0A3C }, { 0x0A41, 0x0A42 },
+               { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D }, { 0x0A51, 0x0A51 },
+               { 0x0A70, 0x0A71 }, { 0x0A75, 0x0A75 }, { 0x0A81, 0x0A82 },
                { 0x0ABC, 0x0ABC }, { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 },
                { 0x0ACD, 0x0ACD }, { 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 },
-               { 0x0B3C, 0x0B3C }, { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 },
-               { 0x0B4D, 0x0B4D }, { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 },
-               { 0x0BC0, 0x0BC0 }, { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 },
-               { 0x0C46, 0x0C48 }, { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 },
-               { 0x0CBC, 0x0CBC }, { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 },
-               { 0x0CCC, 0x0CCD }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D },
-               { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 },
-               { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E },
-               { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC },
-               { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 },
-               { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E },
-               { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 },
-               { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 },
-               { 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 },
-               { 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x1712, 0x1714 },
-               { 0x1732, 0x1734 }, { 0x1752, 0x1753 }, { 0x1772, 0x1773 },
-               { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD }, { 0x17C6, 0x17C6 },
-               { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD }, { 0x180B, 0x180D },
-               { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 }, { 0x1927, 0x1928 },
-               { 0x1932, 0x1932 }, { 0x1939, 0x193B }, { 0x200B, 0x200F },
-               { 0x202A, 0x202E }, { 0x2060, 0x2063 }, { 0x206A, 0x206F },
-               { 0x20D0, 0x20EA }, { 0x302A, 0x302F }, { 0x3099, 0x309A },
-               { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F }, { 0xFE20, 0xFE23 },
-               { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB }, { 0x1D167, 0x1D169 },
-               { 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B },
-               { 0x1D1AA, 0x1D1AD }, { 0xE0001, 0xE0001 },
-               { 0xE0020, 0xE007F }, { 0xE0100, 0xE01EF }
+               { 0x0B3C, 0x0B3C }, { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B44 },
+               { 0x0B4D, 0x0B4D }, { 0x0B56, 0x0B56 }, { 0x0B62, 0x0B63 },
+               { 0x0B82, 0x0B82 }, { 0x0BC0, 0x0BC0 }, { 0x0BCD, 0x0BCD },
+               { 0x0C3E, 0x0C40 }, { 0x0C46, 0x0C48 }, { 0x0C4A, 0x0C4D },
+               { 0x0C55, 0x0C56 }, { 0x0C62, 0x0C63 }, { 0x0CBC, 0x0CBC },
+               { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
+               { 0x0CE2, 0x0CE3 }, { 0x0D41, 0x0D44 }, { 0x0D4D, 0x0D4D },
+               { 0x0D62, 0x0D63 }, { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 },
+               { 0x0DD6, 0x0DD6 }, { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A },
+               { 0x0E47, 0x0E4E }, { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 },
+               { 0x0EBB, 0x0EBC }, { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 },
+               { 0x0F35, 0x0F35 }, { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 },
+               { 0x0F71, 0x0F7E }, { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 },
+               { 0x0F8D, 0x0F97 }, { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 },
+               { 0x102D, 0x1030 }, { 0x1032, 0x1037 }, { 0x1039, 0x103A },
+               { 0x103D, 0x103E }, { 0x1058, 0x1059 }, { 0x105E, 0x1060 },
+               { 0x1071, 0x1074 }, { 0x1082, 0x1082 }, { 0x1085, 0x1086 },
+               { 0x108D, 0x108D }, { 0x109D, 0x109D }, { 0x1160, 0x11FF },
+               { 0x135D, 0x135F }, { 0x1712, 0x1714 }, { 0x1732, 0x1734 },
+               { 0x1752, 0x1753 }, { 0x1772, 0x1773 }, { 0x17B4, 0x17B5 },
+               { 0x17B7, 0x17BD }, { 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 },
+               { 0x17DD, 0x17DD }, { 0x180B, 0x180E }, { 0x18A9, 0x18A9 },
+               { 0x1920, 0x1922 }, { 0x1927, 0x1928 }, { 0x1932, 0x1932 },
+               { 0x1939, 0x193B }, { 0x1A17, 0x1A18 }, { 0x1A1B, 0x1A1B },
+               { 0x1A56, 0x1A56 }, { 0x1A58, 0x1A5E }, { 0x1A60, 0x1A60 },
+               { 0x1A62, 0x1A62 }, { 0x1A65, 0x1A6C }, { 0x1A73, 0x1A7C },
+               { 0x1A7F, 0x1A7F }, { 0x1B00, 0x1B03 }, { 0x1B34, 0x1B34 },
+               { 0x1B36, 0x1B3A }, { 0x1B3C, 0x1B3C }, { 0x1B42, 0x1B42 },
+               { 0x1B6B, 0x1B73 }, { 0x1B80, 0x1B81 }, { 0x1BA2, 0x1BA5 },
+               { 0x1BA8, 0x1BA9 }, { 0x1BAB, 0x1BAB }, { 0x1BE6, 0x1BE6 },
+               { 0x1BE8, 0x1BE9 }, { 0x1BED, 0x1BED }, { 0x1BEF, 0x1BF1 },
+               { 0x1C2C, 0x1C33 }, { 0x1C36, 0x1C37 }, { 0x1CD0, 0x1CD2 },
+               { 0x1CD4, 0x1CE0 }, { 0x1CE2, 0x1CE8 }, { 0x1CED, 0x1CED },
+               { 0x1CF4, 0x1CF4 }, { 0x1DC0, 0x1DE6 }, { 0x1DFC, 0x1DFF },
+               { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x2060, 0x2064 },
+               { 0x2066, 0x206F }, { 0x20D0, 0x20F0 }, { 0x2CEF, 0x2CF1 },
+               { 0x2D7F, 0x2D7F }, { 0x2DE0, 0x2DFF }, { 0x302A, 0x302D },
+               { 0x3099, 0x309A }, { 0xA66F, 0xA672 }, { 0xA674, 0xA67D },
+               { 0xA69F, 0xA69F }, { 0xA6F0, 0xA6F1 }, { 0xA802, 0xA802 },
+               { 0xA806, 0xA806 }, { 0xA80B, 0xA80B }, { 0xA825, 0xA826 },
+               { 0xA8C4, 0xA8C4 }, { 0xA8E0, 0xA8F1 }, { 0xA926, 0xA92D },
+               { 0xA947, 0xA951 }, { 0xA980, 0xA982 }, { 0xA9B3, 0xA9B3 },
+               { 0xA9B6, 0xA9B9 }, { 0xA9BC, 0xA9BC }, { 0xAA29, 0xAA2E },
+               { 0xAA31, 0xAA32 }, { 0xAA35, 0xAA36 }, { 0xAA43, 0xAA43 },
+               { 0xAA4C, 0xAA4C }, { 0xAAB0, 0xAAB0 }, { 0xAAB2, 0xAAB4 },
+               { 0xAAB7, 0xAAB8 }, { 0xAABE, 0xAABF }, { 0xAAC1, 0xAAC1 },
+               { 0xAAEC, 0xAAED }, { 0xAAF6, 0xAAF6 }, { 0xABE5, 0xABE5 },
+               { 0xABE8, 0xABE8 }, { 0xABED, 0xABED }, { 0xFB1E, 0xFB1E },
+               { 0xFE00, 0xFE0F }, { 0xFE20, 0xFE26 }, { 0xFEFF, 0xFEFF },
+               { 0xFFF9, 0xFFFB }, { 0x101FD, 0x101FD }, { 0x10A01, 0x10A03 },
+               { 0x10A05, 0x10A06 }, { 0x10A0C, 0x10A0F }, { 0x10A38, 0x10A3A 
},
+               { 0x10A3F, 0x10A3F }, { 0x11001, 0x11001 }, { 0x11038, 0x11046 
},
+               { 0x11080, 0x11081 }, { 0x110B3, 0x110B6 }, { 0x110B9, 0x110BA 
},
+               { 0x110BD, 0x110BD }, { 0x11100, 0x11102 }, { 0x11127, 0x1112B 
},
+               { 0x1112D, 0x11134 }, { 0x11180, 0x11181 }, { 0x111B6, 0x111BE 
},
+               { 0x116AB, 0x116AB }, { 0x116AD, 0x116AD }, { 0x116B0, 0x116B5 
},
+               { 0x116B7, 0x116B7 }, { 0x16F8F, 0x16F92 }, { 0x1D167, 0x1D169 
},
+               { 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD 
},
+               { 0x1D242, 0x1D244 }, { 0xE0001, 0xE0001 }, { 0xE0020, 0xE007F 
},
+               { 0xE0100, 0xE01EF }
        };
 
        /* test for 8-bit control characters */
-- 
1.9.2.691.g8d8dc6d

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