344 lines
9.7 KiB
Python
344 lines
9.7 KiB
Python
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#! /usr/bin/env python
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# This file sources the etc bashrc, finds the differences to the old
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# configuration and makes them available in a format that the calling
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# shell can understand
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#
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import sys
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# This part is lifted from six.py (https://pythonhosted.org/six/) to
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# make sure that this script runs with Python 2 and Python 3
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# True if we are running on Python 3.
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PY3 = sys.version_info[0] == 3
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if PY3:
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import builtins
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print_ = getattr(builtins, "print")
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del builtins
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else:
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def print_(*args, **kwargs):
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"""The new-style print function."""
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fp = kwargs.pop("file", sys.stdout)
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if fp is None:
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return
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def write(data):
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if not isinstance(data, basestring):
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data = str(data)
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fp.write(data)
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want_unicode = False
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sep = kwargs.pop("sep", None)
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if sep is not None:
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if isinstance(sep, unicode):
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want_unicode = True
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elif not isinstance(sep, str):
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raise TypeError("sep must be None or a string")
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end = kwargs.pop("end", None)
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if end is not None:
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if isinstance(end, unicode):
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want_unicode = True
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elif not isinstance(end, str):
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raise TypeError("end must be None or a string")
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if kwargs:
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raise TypeError("invalid keyword arguments to print()")
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if not want_unicode:
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for arg in args:
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if isinstance(arg, unicode):
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want_unicode = True
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break
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if want_unicode:
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newline = unicode("\n")
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space = unicode(" ")
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else:
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newline = "\n"
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space = " "
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if sep is None:
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sep = space
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if end is None:
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end = newline
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for i, arg in enumerate(args):
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if i:
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write(sep)
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write(arg)
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write(end)
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def printDebug(*args):
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print_(*args,file=sys.stderr)
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# the actual work starts here
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from os import environ,path
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if sys.version_info<(2,6):
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from popen2 import popen4
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else:
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from subprocess import Popen,PIPE,STDOUT
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# only for development
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verbose="FOAM_NEW_STARTUP_DEBUG" in environ
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# Location of this script
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here=path.dirname(path.abspath(sys.argv[0]))
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if verbose:
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printDebug("Using scripts in",here)
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# For which shell
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destShell=sys.argv[1]
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# Variables like WM_COMPILER=Gcc46
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additional=sys.argv[2:]
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if verbose:
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printDebug("Target shell",destShell)
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printDebug("Additional settings:",additional)
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# Certain bashrc-s fail if these are set
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for v in ["FOAM_INST_DIR",
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"WM_THIRD_PARTY_DIR",
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"WM_PROJECT_USER_DIR",
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"OPAL_PREFIX"]:
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try:
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del environ[v]
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except KeyError:
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pass
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# To be executed in bash
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cmd ='echo "=== Export pre";export;echo "=== Alias pre";alias;'
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cmd+='echo "=== Script";. '+path.join(here,"bashrc")+' '+' '.join(additional)+';'
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cmd+='echo "=== Export post";export;echo "=== Alias post";alias;'
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cmd+='echo "=== End"'
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cmd="bash -c '"+cmd+"'"
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if verbose:
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printDebug("Cmd:",cmd)
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# Execute the shell commands
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if sys.version_info<(2,6):
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# for old machines (RHEL 5)
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raus,rein = popen4(cmd)
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ret=0 # standin for a proper implementation
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else:
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p = Popen(cmd, shell=True,
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stdin=PIPE, stdout=PIPE, stderr=STDOUT, close_fds=True)
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(rein,raus)=(p.stdin,p.stdout)
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ret=p.wait()
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lines=[l.strip().decode() for l in raus.readlines()]
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rein.close()
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raus.close()
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if verbose or ret!=0:
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printDebug("========= Script output start")
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for l in lines:
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printDebug(l)
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printDebug("========= Script output end")
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if ret!=0:
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printDebug("Command return code",ret,". There seems to be a problem")
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def extractVariables(lines):
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vars={}
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# different forms if bash is called as sh
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prefixes=["export ","declare -x "]
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for l in lines:
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pref=None
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for p in prefixes:
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if l.find(p)==0:
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pref=p
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break
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pos=l.find("=")
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name=l[len(pref):pos]
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if pos>0:
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val=l[pos+1:]
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if val[0]=='"' and val[-1]=='"':
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val=val[1:-1]
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else:
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val=""
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vars[name]=val
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return vars
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def extractAliases(lines):
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aliases={}
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for l in lines:
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pref="" # if called as sh
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if l.find("alias ")==0:
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pref="alias "
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pos=l.find("=")
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aliases[l[len(pref):pos]]=l[pos+2:-1]
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return aliases
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def changedVars(old,new):
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changed={}
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for k in new:
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if k not in old:
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changed[k]=new[k]
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elif old[k]!=new[k]:
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changed[k]=new[k]
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return changed
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def splitPaths(orig):
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new={}
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for k in orig.keys():
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if k.find("PATH")>=0 and orig[k].find(":")>=0:
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new[k]=orig[k].split(":")
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else:
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new[k]=orig[k]
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return new
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try:
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vars=splitPaths(
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changedVars(extractVariables(lines[lines.index("=== Export pre")+1:
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lines.index("=== Alias pre")]),
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extractVariables(lines[lines.index("=== Export post")+1:
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lines.index("=== Alias post")])))
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aliases=changedVars(extractAliases(lines[lines.index("=== Alias post")+1:
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lines.index("=== Script")]),
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extractAliases(lines[lines.index("=== Alias post")+1:
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lines.index("=== End")]))
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scriptOutput=lines[lines.index("=== Script")+1:
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lines.index("=== Export post")]
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except Exception:
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e = sys.exc_info()[1] # Needed because python 2.5 does not support 'as e'
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err, detail, tb = sys.exc_info()
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printDebug("Output of",cmd,"not successfully parsed")
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import traceback
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traceback.print_exception(err,detail,tb,file=sys.stderr)
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sys.exit(-1)
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# Pass output of the script to stderr for debugging
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if len(scriptOutput)>0:
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for l in scriptOutput:
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print_(l,file=sys.stderr)
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class ShellConvert(object):
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def __call__(self,vars,aliases):
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result=""
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for v in sorted(vars.keys()):
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result+=self.toVar(v,vars[v])+"\n"
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for a in sorted(aliases.keys()):
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result+=self.toAlias(a,aliases[a])+"\n"
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return result
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class BashConvert(ShellConvert):
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def toVar(self,n,v):
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if type(v)==list:
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val=":".join(v)
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else:
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val=v
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if " " in val:
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return 'export %s="%s"' % (n,val)
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else:
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return 'export %s=%s' % (n,val)
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def toAlias(self,n,v):
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return "alias %s='%s'" % (n,v)
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class CshConvert(ShellConvert):
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def __init__(self,sName="csh"):
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self.shellName=sName
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def toVar(self,n,v):
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if type(v)==list:
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val=":".join(v)
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else:
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val=v
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result='setenv %s "%s"' % (n,val)
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if n=="PATH":
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result+="\nset path=(%s)" % " ".join(v)
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return result
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def toAlias(self,n,v):
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val=v.replace(" . ","source ").replace("bash",self.shellName)
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if val.find("unset ")>=0:
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val=val.replace("unset ","unsetenv ")
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# Make sure that more than one export is possible and no wrong = is replaced
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while val.find("export ")>=0:
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pos=val.find("export ")
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val=val.replace("export ","setenv ",1)
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val=val[:pos]+val[pos:].replace("="," ",1)
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# Prefix with a variable that tells the script that it is sourced from an alias
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if val.find("source")>=0:
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val=("setenv FOAM_SOURCED_FROM_ALIAS %s/tcshrc ; " % here)+val
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return "alias %s '%s'" % (n,val)
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class TcshConvert(CshConvert):
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def __init__(self):
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CshConvert.__init__(self,"tcsh")
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class FishConvert(ShellConvert):
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def toVar(self,n,v):
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if type(v)==list:
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val=":".join(v)
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else:
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val=v
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if n=="PATH":
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result="\nset -x PATH %s" % " ".join(v)
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else:
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result='set -x %s "%s"' % (n,val)
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return result
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def toAlias(self,n,v):
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val=v.replace(" . ","source ").replace("bash","fish")
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if val.find("unset ")>=0:
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val=val.replace("unset ","set -e ")
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# Make sure that more than one export is possible and no wrong = is replaced
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while val.find("export ")>=0:
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pos=val.find("export ")
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val=val.replace("export ","set -x ",1)
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val=val[:pos]+val[pos:].replace("="," ",1)
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return "alias %s '%s'" % (n,val)
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class ZshConvert(BashConvert):
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def toAlias(self,n,v):
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return BashConvert.toAlias(self,n,v).replace("bash","zsh")
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shells={"bash" : BashConvert,
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"zsh" : ZshConvert,
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"fish" : FishConvert,
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"csh" : CshConvert,
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"tcsh" : TcshConvert}
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try:
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converter=shells[destShell]()
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except KeyError:
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printDebug("No converter for shell",destShell,
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"Available:"," ".join(shells.keys()))
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sys.exit(-1)
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try:
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result=converter(vars,aliases)
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except Exception:
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e = sys.exc_info()[1] # Needed because python 2.5 does not support 'as e'
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err, detail, tb = sys.exc_info()
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printDebug("Problem while converting output for",destShell)
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import traceback
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traceback.print_exception(err,detail,tb,file=sys.stderr)
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sys.exit(-1)
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if PY3:
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osException=OSError
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else:
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osException=IOError
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try:
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open(path.abspath(sys.argv[0])+"."+destShell,"w").write(result)
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except osException:
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# We are not allowed to write here. Try tmp
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try:
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open(path.join("/tmp",
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path.basename(sys.argv[0])+"."+destShell),"w").write(result)
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except osException:
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# Nobody wants this
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pass
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# This is the only part that goes to stdout to be sourced by the calling script
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print_(result)
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