view tests/test-issue2137 @ 11297:d320e70442a5

replace Python standard textwrap by MBCS sensitive one for i18n text

Mercurial has problem around text wrapping/filling in MBCS encoding
environment, because standard 'textwrap' module of Python can not
treat it correctly. It splits byte sequence for one character into two
lines.

According to unicode specification, "east asian width" classifies
characters into:

   W(ide), N(arrow), F(ull-width), H(alf-width), A(mbiguous)


W/N/F/H can be always recognized as 2/1/2/1 bytes in byte sequence,
but 'A' can not. Size of 'A' depends on language in which it is used.

Unicode specification says:

   If the context(= language) cannot be established reliably they
   should be treated as narrow characters by default

but many of class 'A' characters are full-width, at least, in Japanese
environment.

So, this patch treats class 'A' characters as full-width always for
safety wrapping.

This patch focuses only on MBCS safe-ness, not on writing/printing
rule strict wrapping for each languages

MBCS sensitive textwrap class is originally implemented
by ITO Nobuaki <[e-mail]>.

#!/bin/sh

echo "% setup"

# create a little extension that has 3 side-effects:
#   1) ensure changelog data is not inlined
#   2) make revlog to use lazyparser
#   3) test that repo.lookup() works
# 1 and 2 are preconditions for the bug; 3 is the bug.
cat > commitwrapper.py <<EOF
from mercurial import extensions, node, revlog

def reposetup(ui, repo):
    def wrapcommit(orig, *args, **kwargs):
        result = orig(*args, **kwargs)
        tip1 = node.short(repo.changelog.tip())
        tip2 = node.short(repo.lookup(tip1))
        assert tip1 == tip2
        ui.write('new tip: %s\n' % tip1)
        return result

    extensions.wrapfunction(repo, 'commit', wrapcommit)

def extsetup(ui):
    revlog._maxinline = 8             # split out 00changelog.d early
    revlog._prereadsize = 8           # use revlog.lazyparser
EOF

cat >> $HGRCPATH <<EOF
[extensions]
commitwrapper = `pwd`/commitwrapper.py
EOF

hg init repo1
cd repo1
echo a > a
hg commit -A -m'add a with a long commit message to make the changelog a bit bigger'

echo ""
echo "% test that new changesets are visible to repo.lookup()"
echo a >> a
hg commit -m'one more commit to demonstrate the bug'
hg tip