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lept: improve lib not found error message

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Closes #471
This commit is contained in:
James R. Barlow 2020-01-05 01:05:36 -08:00
parent 8f984bf958
commit 5b6ab1e003
1 changed files with 18 additions and 7 deletions
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25
src/ocrmypdf/leptonica.py
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@ -47,21 +47,32 @@ if os.name == 'nt':
else:
libname = 'lept'
_libpath = find_library(libname)
if not _libpath and os.name == 'nt':
if not _libpath:
raise MissingDependencyError(
"""
---------------------------------------------------------------------
This error normally occurs when ocrmypdf can't find a file named
liblept-5.dll (Leptonica). Please ensure Tesseract-OCR is installed
and its location is added to the system PATH environment variable.
This error normally occurs when ocrmypdf can't find the Leptonica
library, which is usually installed with Tesseract OCR. It could be that
Tesseract is not installed properly, we can't find the installation
on your system PATH environment variable.
For details see:
The library we are looking for is usually called:
liblept-5.dll (Windows)
liblept*.dylib (macOS)
liblept*.so (Linux/BSD)
Please review our installation procedures to find a solution:
https://ocrmypdf.readthedocs.io/en/latest/installation.html
---------------------------------------------------------------------
"""
)
lept = ffi.dlopen(_libpath)
lept.setMsgSeverity(lept.L_SEVERITY_WARNING)
try:
lept = ffi.dlopen(_libpath)
lept.setMsgSeverity(lept.L_SEVERITY_WARNING)
except ffi.error as e:
raise MissingDependencyError(
f"Leptonica library found at {_libpath}, but we could not access it"
) from e
class _LeptonicaErrorTrap: