Mercurial > hg
view mercurial/cffi/mpatchbuild.py @ 38047:dabc2237963c
crecord: fallback to text mode if diffs are too big for curses mode
crecord uses curses.newpad to create a region that we can then scroll around in
by moving the main 'screen' as a veiwport into the (probably larger than the
actual screen) pad. Internally, at least in ncurses, pads are implemented using
windows, which have their dimensions limited to a certain size. Depending on
compilation options for ncurses, this size might be pretty small: (signed)
short, or it might be larger ((signed) int).
crecord wants to have enough room to have all of the contents of the main area
of the chunkselector in the pad; this means that the full size with everything
expanded must be less than these (undocumented, afaict) limits.
It's not easy to write tests for this because the limits are platform- and
installation- dependent and undocumented / unqueryable, as far as I can tell.
Differential Revision: https://phab.mercurial-scm.org/D3577
author | Kyle Lippincott <spectral@google.com> |
---|---|
date | Thu, 17 May 2018 23:11:24 -0700 |
parents | 0585337ea787 |
children | 2372284d9457 |
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from __future__ import absolute_import import cffi import os ffi = cffi.FFI() mpatch_c = os.path.join(os.path.join(os.path.dirname(__file__), '..', 'mpatch.c')) with open(mpatch_c) as f: ffi.set_source("mercurial.cffi._mpatch", f.read(), include_dirs=["mercurial"]) ffi.cdef(""" struct mpatch_frag { int start, end, len; const char *data; }; struct mpatch_flist { struct mpatch_frag *base, *head, *tail; }; extern "Python" struct mpatch_flist* cffi_get_next_item(void*, ssize_t); int mpatch_decode(const char *bin, ssize_t len, struct mpatch_flist** res); ssize_t mpatch_calcsize(size_t len, struct mpatch_flist *l); void mpatch_lfree(struct mpatch_flist *a); static int mpatch_apply(char *buf, const char *orig, size_t len, struct mpatch_flist *l); struct mpatch_flist *mpatch_fold(void *bins, struct mpatch_flist* (*get_next_item)(void*, ssize_t), ssize_t start, ssize_t end); """) if __name__ == '__main__': ffi.compile()