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"""
@file
@brief Looks for paths, Miktek, Graphviz...
"""
import sys
import os
import errno
def find_in_PATH(prog):
"""
look into every path mentioned in ``%PATH%`` a specific file,
it raises an exception if not Found
@param prog program to look for
@return path
"""
sep = ";" if sys.platform.startswith("win") else ":"
path = os.environ["PATH"]
for p in path.split(sep):
f = os.path.join(p, prog)
if os.path.exists(f):
return p
return None
def find_graphviz_dot(exc=True):
"""
Determines the path to graphviz (on Windows),
the function tests the existence of versions 34 to 45
assuming it was installed in a standard folder:
``C:\\Program Files\\MiKTeX 2.9\\miktex\\bin\\x64``.
:param exc: raise exception of be silent
:return: path to dot
:raises FileNotFoundError: if graphviz not found
"""
if sys.platform.startswith("win"):
version = range(34, 45)
for v in version:
graphviz_dot = "C:\\Program Files (x86)\\Graphviz2.{0}\\bin\\dot.exe".format(
v)
if os.path.exists(graphviz_dot):
return graphviz_dot
extra = ['build/update_modules/Graphviz/bin']
for ext in extra:
graphviz_dot = os.path.join(ext, "dot.exe")
if os.path.exists(graphviz_dot):
return graphviz_dot
p = find_in_PATH("dot.exe")
if p is None:
if exc:
typstr = str
raise FileNotFoundError(
"Unable to find graphviz, look into paths such as: {}".format(
typstr(graphviz_dot)))
return None
else:
return os.path.join(p, "dot.exe")
else:
# linux
return "dot"
def find_latex_path(exc=True):
"""
Finds latex path.
Returns an empty string on :epkg:`linux`.
:param exc: raises an exception or be silent
:return: something like ``C:\\Program Files\\MiKTeX 2.9\\miktex\\bin\\x64``
:raises FileNotFoundError: if latex not found
"""
if sys.platform.startswith("win"):
latex = latex0 = r"C:\Program Files\MiKTeX 2.9\miktex\bin\x64"
if not os.path.exists(latex):
latex = find_in_PATH("latex.exe")
if latex is None or not os.path.exists(latex):
if exc:
typstr = str
raise FileNotFoundError(
"unable to find latex (miktex), look into paths such as: " + typstr(latex0))
return None
return latex
else:
# linux, should be in PATH.
return ""
def find_pandoc_path(exc=True):
"""
Determines :epkg:`pandoc` location.
Returns an empty string on :epkg:`linux`.
@return path to :epkg:`pandoc`
"""
if sys.platform.startswith("win"):
path = os.environ["USERPROFILE"]
pandoc = os.path.join(path, "AppData", "Local", "Pandoc")
pdoc = os.path.join(pandoc, "pandoc.exe")
if os.path.exists(pdoc):
return pandoc
tries = [pandoc]
path = os.environ["ProgramFiles(x86)"]
pandoc = os.path.join(path, "Pandoc")
pdoc = os.path.join(pandoc, "pandoc.exe")
if os.path.exists(pdoc):
return pandoc
tries.append(pandoc)
if not os.path.exists(pandoc):
# we try others users because pandoc goes into a user folder by
# default
root = os.path.normpath(os.path.join(path, ".."))
users = os.listdir(root)
for u in users:
p = os.path.join(root, u)
if os.path.isdir(p):
pandoc = os.path.join(p, "AppData", "Local", "Pandoc")
if os.path.exists(pandoc):
return pandoc
tries.append(pandoc)
pandoc = find_in_PATH("pandoc.exe")
if pandoc is None and exc:
raise FileNotFoundError(
"unable to find pandoc, look into paths such as:\n" + "\n".join(tries))
return pandoc
else:
return pandoc
else:
# linux, should be in PATH.
return ""
def custom_ensuredir(path):
# type: (unicode) -> None
"""Ensure that a path exists."""
if "IMPOSSIBLE:TOFIND" in path:
return
try:
os.makedirs(path)
except OSError as err:
# 0 for Jython/Win32
EEXIST = getattr(errno, 'EEXIST', 0)
if err.errno not in [0, EEXIST]:
raise
def find_dvipng_path(exc=True):
"""
Determines :epkg:`dvipng` location.
@return *imgmath_latex*, *imgmath_dvipng*, *imgmath_dvisvgm*
.. versionadded:: 1.8
"""
if sys.platform.startswith("win"):
sep = ";"
imgmath_latex = find_latex_path(exc=exc)
if imgmath_latex is None:
imgmath_dvipng = None
else:
imgmath_dvipng = os.path.join(imgmath_latex, "dvipng.exe")
if imgmath_dvipng is None or not os.path.exists(imgmath_dvipng):
if exc:
raise FileNotFoundError(imgmath_dvipng)
imgmath_dvipng = "dvipng"
if imgmath_latex is None:
imgmath_dvisvgm = None
else:
imgmath_dvisvgm = os.path.join(imgmath_latex, "dvisvgm.exe")
if imgmath_dvisvgm is None or not os.path.exists(imgmath_dvisvgm):
if exc:
raise FileNotFoundError(imgmath_dvisvgm)
imgmath_dvisvgm = "dvisvgm"
env_path = os.environ.get("PATH", "")
if imgmath_latex and imgmath_latex not in env_path:
if len(env_path) > 0:
env_path += sep
env_path += imgmath_latex
if imgmath_latex is not None and sys.platform.startswith("win"):
imgmath_latex = os.path.join(imgmath_latex, "latex.exe")
# verification
if imgmath_latex is None or not os.path.exists(imgmath_latex):
if exc:
raise FileNotFoundError(imgmath_latex)
imgmath_latex = "latex"
if imgmath_dvipng is None or not os.path.exists(imgmath_dvipng):
if exc:
raise FileNotFoundError(imgmath_dvipng)
imgmath_dvipng = "dvipng"
else:
# On linux, we expect latex, dvipng, dvisvgm to be available.
imgmath_latex = "latex"
imgmath_dvipng = "dvipng"
imgmath_dvisvgm = "dvisvgm"
return imgmath_latex, imgmath_dvipng, imgmath_dvisvgm
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