view mercurial/diffhelper.py @ 47205:603efb3845ba

pyoxidizer: support producing MSI installers

Newer versions of PyOxidizer have support for building WiX MSI
installers "natively." Essentially, you can script the definition
of your WiX installer via Starlark and PyOxidizer can invoke
WiX tools to produce the installer.

This commit teaches our PyOxidizer config file to produce MSI
installers similarly to how
`contrib/packaging/packging.py wix` would do it.

We had to make a very minor change to `mercurial.wxs` to reflect
different paths depending on who builds. This is because when
PyOxidizer builds WiX installers, it does so from an isolated
directory, not Mercurial's source directory. We simply copy the
files into the build environment so they are accessible.

After this change, running `pyoxidizer build msi` produces a nearly
identical install layout to what the previous method produces.
When I applied this series on top of the 5.8 tag, here is the
list of differences and explanations:

* docs/*.html files are missing from the new installer because the
  Python build environment doesn't have docutils.
* .pyd and .exe files differ, likely because I'm using a different
  Visual Studio toolchain on my local computer than the official build
  environment.
* Various .dist-info/ directories have different names. This is
  because older versions of PyOxidizer had buggy behavior and weren't
  properly normalizing package names in .dist-info/ directories. e.g.
  we went from `cached-property-1.5.2.dist-info` to
  `cached_property-1.5.2.dist-info`.
* Translations (.mo files) may be missing if gettext isn't in %Path%.
  This is because the packaging.py code installs gettext and ensures
  it can be found.
* Some *.dist-info/RECORD files vary due to SHA-256 content digest
  divergence due to build environment differences. (This should be
  harmless.)
* The new install layout ships a python3.dll because newer versions
  of PyOxidizer ship this file.
* The new install layout has a different vcruntime140.dll and also a
  vcruntime140_1.dll because newer versions of PyOxidizer ship a
  newer version of the Visual C++ Redistributable Runtime.

The new PyOxidizer functionality is not yet integrated with
packaging.py. This will come in a subsequent commit. So for now, the
new functionality introduced here is unused.

Differential Revision: https://phab.mercurial-scm.org/D10683

# diffhelper.py - helper routines for patch
#
# Copyright 2009 Olivia Mackall <[e-mail]> and others
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

from .i18n import _

from . import (
    error,
    pycompat,
)

MISSING_NEWLINE_MARKER = b'\\ No newline at end of file\n'


def addlines(fp, hunk, lena, lenb, a, b):
    """Read lines from fp into the hunk

    The hunk is parsed into two arrays, a and b. a gets the old state of
    the text, b gets the new state. The control char from the hunk is saved
    when inserting into a, but not b (for performance while deleting files.)
    """
    while True:
        todoa = lena - len(a)
        todob = lenb - len(b)
        num = max(todoa, todob)
        if num == 0:
            break
        for i in pycompat.xrange(num):
            s = fp.readline()
            if not s:
                raise error.ParseError(_(b'incomplete hunk'))
            if s == MISSING_NEWLINE_MARKER:
                fixnewline(hunk, a, b)
                continue
            if s == b'\n' or s == b'\r\n':
                # Some patches may be missing the control char
                # on empty lines. Supply a leading space.
                s = b' ' + s
            hunk.append(s)
            if s.startswith(b'+'):
                b.append(s[1:])
            elif s.startswith(b'-'):
                a.append(s)
            else:
                b.append(s[1:])
                a.append(s)


def fixnewline(hunk, a, b):
    """Fix up the last lines of a and b when the patch has no newline at EOF"""
    l = hunk[-1]
    # tolerate CRLF in last line
    if l.endswith(b'\r\n'):
        hline = l[:-2]
    else:
        hline = l[:-1]

    if hline.startswith((b' ', b'+')):
        b[-1] = hline[1:]
    if hline.startswith((b' ', b'-')):
        a[-1] = hline
    hunk[-1] = hline


def testhunk(a, b, bstart):
    """Compare the lines in a with the lines in b

    a is assumed to have a control char at the start of each line, this char
    is ignored in the compare.
    """
    alen = len(a)
    blen = len(b)
    if alen > blen - bstart or bstart < 0:
        return False
    for i in pycompat.xrange(alen):
        if a[i][1:] != b[i + bstart]:
            return False
    return True