view mercurial/cffi/bdiffbuild.py @ 46273:efc71bb71682

shelve: introduce class representing a shelf

I'm about to make phase-based shelve not write `.hg` and `.patch`
files. Having a class that represents a single shelf, regardless of
which files it uses will help. I'm starting small with just a
`.exists()` function. I plan to eventually remove the `shelvedfile`
class once all functionality has been moved to the new class.

By the way, I know that things you shelve are not typically themselves
shelves. I still picked `Shelf` for the class because it's short
(compared to e.g. `ShelvedChange`).

Differential Revision: https://phab.mercurial-scm.org/D9700

from __future__ import absolute_import

import cffi
import os

ffi = cffi.FFI()
with open(
    os.path.join(os.path.join(os.path.dirname(__file__), '..'), 'bdiff.c')
) as f:
    ffi.set_source(
        "mercurial.cffi._bdiff", f.read(), include_dirs=['mercurial']
    )
ffi.cdef(
    """
struct bdiff_line {
    int hash, n, e;
    ssize_t len;
    const char *l;
};

struct bdiff_hunk;
struct bdiff_hunk {
    int a1, a2, b1, b2;
    struct bdiff_hunk *next;
};

int bdiff_splitlines(const char *a, ssize_t len, struct bdiff_line **lr);
int bdiff_diff(struct bdiff_line *a, int an, struct bdiff_line *b, int bn,
    struct bdiff_hunk *base);
void bdiff_freehunks(struct bdiff_hunk *l);
void free(void*);
"""
)

if __name__ == '__main__':
    ffi.compile()