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(python) Throw an exception if the index file can't be opened #1195

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(python) Throw an exception if the index file can't be opened #1195

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5 changes: 4 additions & 1 deletion python/mappy.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@ from libc.stdint cimport uint8_t, int8_t
from libc.stdlib cimport free
cimport cmappy
import sys
from cython.cimports.cpython.exc import PyErr_SetFromErrnoWithFilenameObject

__version__ = '2.28'

Expand Down Expand Up @@ -146,7 +147,9 @@ cdef class Aligner:
r = cmappy.mm_idx_reader_open(str.encode(fn_idx_in), &self.idx_opt, NULL)
else:
r = cmappy.mm_idx_reader_open(str.encode(fn_idx_in), &self.idx_opt, str.encode(fn_idx_out))
if r is not NULL:
if r is NULL:
PyErr_SetFromErrnoWithFilenameObject(OSError, fn_idx_in)
else:
self._idx = cmappy.mm_idx_reader_read(r, n_threads) # NB: ONLY read the first part
cmappy.mm_idx_reader_close(r)
cmappy.mm_mapopt_update(&self.map_opt, self._idx)
Expand Down