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#!/usr/bin/env python
"""
utilities for pyshortcuts
"""
import os
import sys
from pathlib import Path
from datetime import datetime
from string import ascii_letters
try:
from pwd import getpwnam
except ImportError:
getpwnam = None
uname = "unknown"
scut_ext = "lnk"
ico_ext = ("ico",)
if sys.platform.startswith('lin'):
uname = "linux"
scut_ext = "desktop"
ico_ext = ("ico", "png")
elif sys.platform.startswith('darwin'):
uname = 'darwin'
scut_ext = "app"
ico_ext = ("icns",)
elif sys.platform.startswith('win') or os.name.startswith('nt'):
uname = "win"
scut_ext = "lnk"
ico_ext = ("ico",)
def get_homedir():
"determine home directory"
# for Unixes, allow for sudo case
susername = os.environ.get("SUDO_USER", None)
try:
if susername is not None and getpwnam is not None:
return Path(getpwnam(susername).pw_dir).resolve().as_posix()
except KeyError:
pass
homedir = Path.home()
# For Windows, ask for parent of Roaming 'Application Data' directory
if homedir is None and os.name == 'nt':
try:
from win32com.shell import shellcon, shell
homedir = Path(shell.SHGetFolderPath(0, shellcon.CSIDL_APPDATA, 0, 0))
except ImportError:
pass
# try the HOME environmental variable
if homedir is None:
test = os.path.expandvars('$HOME')
if test not in (None, '$HOME'):
homedir = Path(test)
# finally, use current folder
if homedir is None:
homedir = Path('.')
return homedir.resolve().as_posix()
def get_cwd():
"""get current working directory
Note: os.getcwd() can fail with permission error.
when that happens, this changes to the users `HOME` directory
and returns that directory so that it always returns an existing
and readable directory.
"""
try:
return Path('.').resolve().as_posix()
except Exception:
home = get_homedir()
os.chdir(home)
return home
def isotime(dtime=None, timespec='seconds', sep=' '):
"""return ISO format of current timestamp:
2024-04-27 17:31:12
"""
if dtime is None:
dtime = datetime.now()
elif isinstance(dtime, (float, int)):
dtime = datetime.fromtimestamp(dtime)
return datetime.isoformat(dtime, timespec=timespec, sep=sep)
BAD_FILECHARS = ';~,`!%$@$&^?*#:"/|\'\\\t\r\n(){}[]<>'
GOOD_FILECHARS = '_'*len(BAD_FILECHARS)
TRANS_FILE = str.maketrans(BAD_FILECHARS, GOOD_FILECHARS)
def fix_filename(filename, allow_spaces=False):
"""
fix string to be a 'good' filename, with very few special
characters and (optionally) no more than 1 '.'.
More restrictive than most OSes, but avoids hard-to-deal with filenames
argument `allow_spaces` [default is False] allows spaces in filenames.
"""
fname = str(filename).translate(TRANS_FILE)
if not allow_spaces:
fname = fname.replace(' ', '_')
if fname.count('.') > 1:
words = fname.split('.')
ext = words.pop()
fname = f"{'_'.join(words)}.{ext}"
while '__' in fname:
fname = fname.replace('__', '_')
return fname
def fix_varname(varname):
"""fix string to be a 'good' variable name."""
vname = fix_filename(varname, allow_spaces=False)
if vname[0] not in (ascii_letters+'_'):
vname = f'_{vname}'
for c in '=+-.':
vname = vname.replace(c, '_')
while '__' in vname:
vname = vname.replace('__', '_')
if vname.endswith('_'):
vname = vname[:-1]
return vname
def get_pyexe():
"python executable"
return Path(sys.executable).resolve().as_posix()
def new_filename(filename):
"""
increment filename to be an unused filename
"""
fpath = Path(filename)
if fpath.exists():
fstem = fpath.stem
fsuffix = fpath.suffix
if fsuffix.startswith('.'):
fsuffix = fsuffix[1:]
if len(fsuffix) == 0:
fsuffix = 'txt'
int_suffix = True
fsint = 0
try:
fsint = int(fsuffix)
except (ValueError, TypeError):
int_suffix = False
while fpath.exists():
fsint += 1
if int_suffix:
fpath = Path(f"{fstem}.{fsint:03d}")
else:
if '_' in fstem:
w = fstem.split('_')
try:
fsint = int(w[-1])
fstem = '_'.join(w[:-1])
except (ValueError, TypeError):
pass
fpath = Path(f"{fstem}_{fsint:03d}.{fsuffix}")
return fpath.as_posix()
def bytes2str(s):
'byte to string conversion'
if isinstance(s, str):
return s
if isinstance(s, bytes):
return s.decode(sys.stdout.encoding)
return str(s, sys.stdout.encoding)
def str2bytes(s):
'string to byte conversion'
if isinstance(s, bytes):
return s
return bytes(s, sys.stdout.encoding)
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