source: trunk/GSASIIpath.py @ 1900

# -*- coding: utf-8 -*-
'''
*GSASIIpath: locations & updates*
---------------------------------

Routines for dealing with file locations, etc.

Determines the location of the compiled (.pyd or .so) libraries.

Interfaces with subversion (svn): 
Determine the subversion release number by determining the highest version number
where :func:`SetVersionNumber` is called (best done in every GSASII file).
Other routines will update GSASII from the subversion server if svn can be
found.

Accesses configuration options, as defined in config.py
'''

import os
import sys
import platform
# determine a binary path for the pyd files based on the host OS and the python version,  
# path is relative to location of the script that is called as well as this file
# this must be imported before anything that imports any .pyd/.so file for GSASII
bindir = None
if sys.platform == "win32":
    if platform.architecture()[0] == '64bit':
        bindir = 'binwin64-%d.%d' % sys.version_info[0:2]
    else:
        bindir = 'binwin%d.%d' % sys.version_info[0:2]
elif sys.platform == "darwin":
    import platform
    if platform.architecture()[0] == '64bit':
        bindir = 'binmac64-%d.%d' % sys.version_info[0:2]
    else:
        bindir = 'binmac%d.%d' % sys.version_info[0:2]
    if platform.mac_ver()[0].startswith('10.5.'):
        bindir += '_10.5'
elif sys.platform == "linux2":
    if platform.architecture()[0] == '64bit':
        bindir = 'binlinux64-%d.%d' % sys.version_info[0:2]
    else:
        bindir = 'binlinux%d.%d' % sys.version_info[0:2]
for loc in sys.path[0],os.path.abspath(os.path.split(__file__)[0]):
    if bindir:
        if os.path.exists(os.path.join(loc,bindir)) and os.path.join(loc,bindir) not in sys.path: 
            sys.path.insert(0,os.path.join(loc,bindir))
        # is there a bin directory? (created by a local compile), if so put
        # that at the top of the path
    if os.path.exists(os.path.join(loc,'bin')) and os.path.getsize(os.path.join(loc,'bin')):
        bindir = 'bin'
        if os.path.join(loc,'bin') not in sys.path: 
            sys.path.insert(0,os.path.join(loc,bindir))
print 'GSAS-II binary directory: ',os.path.join(loc,bindir)
if bindir == None:
    raise Exception,"**** ERROR GSAS-II binary libraries not found, GSAS-II fails ****"
# add the data import and export directory to the search path
path2GSAS2 = os.path.dirname(os.path.realpath(__file__)) # location of this file; save before any changes in pwd
newpath = os.path.join(path2GSAS2,'imports')
if newpath not in sys.path: sys.path.append(newpath)
newpath = os.path.join(path2GSAS2,'exports')
if newpath not in sys.path: sys.path.append(newpath)

# setup read of config.py, if present
try:
    import config
    configDict = config.__dict__
    import inspect
    vals = [True for i in inspect.getmembers(config) if '__' not in i[0]]
    print str(len(vals))+' values read from config file '+os.path.abspath(config.__file__)
except ImportError:
    configDict = {}
    
def GetConfigValue(key,default=None):
    '''Return the configuration file value for key or a default value if not present
    
    :param str key: a value to be found in the configuration (config.py) file
    :param default: a value to be supplied is none is in the config file or
      the config file is not found. Defaults to None
    :returns: the value found or the default.
    '''
    return configDict.get(key,default)

# routines for looking a version numbers in files
version = -1
def SetVersionNumber(RevString):
    '''Set the subversion version number

    :param str RevString: something like "$Revision: 1729 $"
      that is set by subversion when the file is retrieved from subversion.

    Place ``GSASIIpath.SetVersionNumber("$Revision: 1729 $")`` in every python
    file.
    '''
    try:
        RevVersion = int(RevString.split(':')[1].split()[0])
        global version
        version = max(version,RevVersion)
    except:
        pass
        
def GetVersionNumber():
    '''Return the maximum version number seen in :func:`SetVersionNumber`
    '''
    return version

def LoadConfigFile(filename):
    '''Read a GSAS-II configuration file.
    Comments (starting with "%") are removed, as are empty lines
    
    :param str filename: base file name (such as 'file.dat'). Files with this name
      are located from the path and the contents of each are concatenated.
    :returns: a list containing each non-empty (after removal of comments) line
      found in every matching config file.
    '''
    info = []
    for path in sys.path:
        fil = os.path.join(path,filename)
        if not os.path.exists(fil): continue
        try:
            i = 0
            fp = open(fil,'r')
            for line in fp:
                expr = line.split('#')[0].strip()
                if expr:
                    info.append(expr)
                    i += 1
            print(str(i)+' lines read from config file '+fil)
        finally:
            fp.close()
    return info


# routines to interface with subversion
def whichsvn():
    '''Returns a path to the subversion exe file, if any is found.
    Searches the current path as well as subdirectory "svn" and
    "svn/bin" in the location of the GSASII source files.

    :returns: None if svn is not found or an absolute path to the subversion
      executable file.
    '''
    def is_exe(fpath):
        return os.path.isfile(fpath) and os.access(fpath, os.X_OK)
    svnprog = 'svn'
    if sys.platform == "win32": svnprog += '.exe'
    pathlist = os.environ["PATH"].split(os.pathsep)
    pathlist.insert(0,os.path.join(os.path.split(__file__)[0],'svn'))
    pathlist.insert(1,os.path.join(os.path.split(__file__)[0],'svn','bin'))
    for path in pathlist:
        exe_file = os.path.join(path, svnprog)
        if is_exe(exe_file):
            return os.path.abspath(exe_file)

def svnVersion():
    '''Get the version number of the current subversion executable

    :returns: a string with a version number such as "1.6.6" or None if
      subversion is not found.

    '''
    import subprocess
    svn = whichsvn()
    if not svn: return

    cmd = [svn,'--version','--quiet']
    s = subprocess.Popen(cmd,
                         stdout=subprocess.PIPE,stderr=subprocess.PIPE)
    out,err = s.communicate()
    if err:
        print 'subversion error!\nout=',out
        print 'err=',err
        return None
    return out.strip()

def svnVersionNumber():
    '''Get the version number of the current subversion executable

    :returns: a fractional version number such as 1.6 or None if
      subversion is not found.

    '''
    ver = svnVersion()
    if not ver: return 
    M,m = svnVersion().split('.')[:2]
    return int(M)+int(m)/10.

def svnGetLog(fpath=os.path.split(__file__)[0],version=None):
    '''Get the revision log information for a specific version of the specified package

    :param str fpath: path to repository dictionary, defaults to directory where
       the current file is located.
    :param int version: the version number to be looked up or None (default)
       for the latest version.

    :returns: a dictionary with keys (one hopes) 'author', 'date', 'msg', and 'revision'

    '''
    import subprocess
    import xml.etree.ElementTree as ET
    svn = whichsvn()
    if not svn: return
    if version is not None:
        vstr = '-r'+str(version)
    else:
        vstr = '-rHEAD'

    cmd = [svn,'log',fpath,'--xml',vstr]
    s = subprocess.Popen(cmd,
                         stdout=subprocess.PIPE,stderr=subprocess.PIPE)
    out,err = s.communicate()
    if err:
        print 'out=',out
        print 'err=',err
        return None
    x = ET.fromstring(out)
    d = {}
    for i in x.iter('logentry'):
        d = {'revision':i.attrib.get('revision','?')}
        for j in i:
            d[j.tag] = j.text
        break # only need the first
    return d

def svnGetRev(fpath=os.path.split(__file__)[0],local=True):
    '''Obtain the version number for the either the last update of the local version
    or contacts the subversion server to get the latest update version (# of Head).

    :param str fpath: path to repository dictionary, defaults to directory where
       the current file is located
    :param bool local: determines the type of version number, where
       True (default): returns the latest installed update 
       False: returns the version number of Head on the server

    :Returns: the version number as an str or 
       None if there is a subversion error (likely because the path is
       not a repository or svn is not found)
    '''

    import subprocess
    import xml.etree.ElementTree as ET
    svn = whichsvn()
    if not svn: return
    if local:
        cmd = [svn,'info',fpath,'--xml']
    else:
        cmd = [svn,'info',fpath,'--xml','-rHEAD']
    if svnVersionNumber() >= 1.6:
        cmd += ['--non-interactive', '--trust-server-cert']
    s = subprocess.Popen(cmd, stdout=subprocess.PIPE,stderr=subprocess.PIPE)
    out,err = s.communicate()
    if err:
        print 'svn failed\n',out
        print 'err=',err
        return None
    x = ET.fromstring(out)
    for i in x.iter('entry'):
        rev = i.attrib.get('revision')
        if rev: return rev

def svnFindLocalChanges(fpath=os.path.split(__file__)[0]):
    '''Returns a list of files that were changed locally. If no files are changed,
       the list has length 0

    :param fpath: path to repository dictionary, defaults to directory where
       the current file is located

    :returns: None if there is a subversion error (likely because the path is
       not a repository or svn is not found)

    '''
    import subprocess
    import xml.etree.ElementTree as ET
    svn = whichsvn()
    if not svn: return
    cmd = [svn,'status',fpath,'--xml']
    s = subprocess.Popen(cmd,
                         stdout=subprocess.PIPE,stderr=subprocess.PIPE)
    out,err = s.communicate()
    if err: return None
    x = ET.fromstring(out)
    changed = []
    for i in x.iter('entry'):
        if i.find('wc-status').attrib.get('item') == 'modified': 
            changed.append(i.attrib.get('path'))
    return changed

def svnUpdateDir(fpath=os.path.split(__file__)[0],version=None):
    '''This performs an update of the files in a local directory from a server. 

    :param str fpath: path to repository dictionary, defaults to directory where
       the current file is located
    :param version: the number of the version to be loaded. Used only
       cast as a string, but should be an integer or something that corresponds to a
       string representation of an integer value when cast. A value of None (default)
       causes the latest version on the server to be used.
    '''
    import subprocess
    svn = whichsvn()
    if not svn: return
    if version:
        verstr = '-r' + str(version)
    else:
        verstr = '-rHEAD'
    cmd = [svn,'update',fpath,verstr,
           '--non-interactive',
           '--accept','theirs-conflict','--force']
    if svnVersionNumber() >= 1.6:
        cmd += ['--trust-server-cert']
    s = subprocess.Popen(cmd,stdout=subprocess.PIPE,stderr=subprocess.PIPE)
    out,err = s.communicate()
    if err:
        print(60*"=")
        print ("****** An error was noted, see below *********")
        print(60*"=")
        print err
        sys.exit()

def svnUpgrade(fpath=os.path.split(__file__)[0]):
    '''This reformats subversion files, which may be needed if an upgrade of subversion is
    done. 

    :param str fpath: path to repository dictionary, defaults to directory where
       the current file is located
    '''
    import subprocess
    svn = whichsvn()
    if not svn: return
    cmd = [svn,'upgrade',fpath,'--non-interactive']
    s = subprocess.Popen(cmd,stdout=subprocess.PIPE,stderr=subprocess.PIPE)
    out,err = s.communicate()
    if err:
        print("svn upgrade did not happen (this is probably OK). Messages:")
        print err
            
def svnUpdateProcess(version=None,projectfile=None):
    '''perform an update of GSAS-II in a separate python process'''
    import subprocess
    if not projectfile:
        projectfile = ''
    else:
        projectfile = os.path.realpath(projectfile)
        print 'restart using',projectfile
    if not version:
        version = ''
    else:
        version = str(version)
    # start the upgrade in a separate interpreter (avoids loading .pyd files)
    subprocess.Popen([sys.executable,__file__,projectfile,version])
    sys.exit()

def svnSwitchDir(rpath,filename,baseURL,loadpath=None):
    '''This performs a switch command to move files between subversion trees.

    This is currently used for moving tutorial web pages and demo files
    into the GSAS-II source tree. Note that if the files were previously downloaded
    the switch command will update the files to the newest version. 
    
    :param str rpath: path to locate files, relative to the GSAS-II
      installation path (defaults to path2GSAS2)
    :param str URL: the repository URL
    :param str loadpath: the prefix for the path, if specified. Defaults to path2GSAS2
    '''
    import subprocess
    svn = whichsvn()
    if not svn: return
    URL = baseURL[:]
    if baseURL[-1] != '/':
        URL = baseURL + '/' + filename
    else:
        URL = baseURL + filename
    if loadpath:
        fpath = os.path.join(loadpath,rpath,filename)
    else:
        fpath = os.path.join(path2GSAS2,rpath,filename)
    cmd = [svn,'switch',URL,fpath,
           '--non-interactive','--trust-server-cert',
           '--accept','theirs-conflict','--force']
    if svnVersionNumber() > 1.6: cmd += ['--ignore-ancestry']
    print("Loading files from "+URL+'\n  to '+fpath)
    s = subprocess.Popen(cmd,stdout=subprocess.PIPE,stderr=subprocess.PIPE)
    out,err = s.communicate()
    if err:
        print(60*"=")
        print ("****** An error was noted, see below *********")
        print(60*"=")
        print 'out=',out
        print 'err=',err
        return False
    return True

def svnInstallDir(URL,loadpath):
    '''Load a subversion tree into a specified directory

    :param str rpath: path to locate files, relative to the GSAS-II
      installation path (defaults to path2GSAS2)
    :param str URL: the repository URL
    '''
    import subprocess
    svn = whichsvn()
    if not svn: return
    cmd = [svn,'co',URL,loadpath,'--non-interactive']
    if svnVersionNumber() >= 1.6: cmd += ['--trust-server-cert']
    print("Loading files from "+URL)
    s = subprocess.Popen(cmd,stdout=subprocess.PIPE,stderr=subprocess.PIPE)
    out,err = s.communicate()
    if err:
        print(60*"=")
        print ("****** An error was noted, see below *********")
        print(60*"=")
        print err
        return False
    return True
            
def IPyBreak_base():
    '''A routine that invokes an IPython session at the calling location
    This routine is only used when debug=True is set in config.py
    '''
    savehook = sys.excepthook # save the exception hook
    try: 
        from IPython.terminal.embed import InteractiveShellEmbed
    except ImportError:
        try:
            # try the IPython 0.12 approach
            from IPython.frontend.terminal.embed import InteractiveShellEmbed
        except ImportError:
            print 'IPython InteractiveShellEmbed not found'
            return
    import inspect
    ipshell = InteractiveShellEmbed()

    frame = inspect.currentframe().f_back
    msg   = 'Entering IPython console inside {0.f_code.co_filename} at line {0.f_lineno}'.format(frame)
    ipshell(msg,stack_depth=2) # Go up one level, to see the calling routine
    sys.excepthook = savehook # reset IPython's change to the exception hook

def exceptHook(*args):
    '''A routine to be called when an exception occurs. It prints the traceback
    with fancy formatting and then calls an IPython shell with the environment
    of the exception location.
    
    This routine is only used when debug=True is set in config.py    
    '''
    from IPython.core import ultratb
    if 'win' in sys.platform:
        ultratb.FormattedTB(call_pdb=False,color_scheme='NoColor')(*args)
    else:
        ultratb.FormattedTB(call_pdb=False,color_scheme='LightBG')(*args)
    try: 
        from IPython.terminal.embed import InteractiveShellEmbed
    except ImportError:
        try:
            # try the IPython 0.12 approach
            from IPython.frontend.terminal.embed import InteractiveShellEmbed
        except ImportError:
            print 'IPython InteractiveShellEmbed not found'
            return
    import inspect
    frame = inspect.getinnerframes(args[2])[-1][0]
    msg   = 'Entering IPython console at {0.f_code.co_filename} at line {0.f_lineno}'.format(frame)
    savehook = sys.excepthook # save the exception hook
    InteractiveShellEmbed(banner1=msg)(local_ns=frame.f_locals,global_ns=frame.f_globals)
    sys.excepthook = savehook # reset IPython's change to the exception hook

def DoNothing():
    '''A routine that does nothing. This is called in place of IPyBreak and pdbBreak
    except when the debug option is set True in config.py
    '''
    pass 

IPyBreak = DoNothing
pdbBreak = DoNothing
def InvokeDebugOpts():
    'Called in GSASII.py to set up debug options'
    if GetConfigValue('debug'):
        print 'Debug on: IPython: Exceptions and G2path.IPyBreak(); pdb: G2path.pdbBreak()'
        sys.excepthook = exceptHook
        import pdb
        global pdbBreak
        pdbBreak = pdb.set_trace
        global IPyBreak
        IPyBreak = IPyBreak_base
    
if __name__ == '__main__':
    '''What follows is called to update (or downdate) GSAS-II in a separate process. 
    '''
    import subprocess
    import time
    time.sleep(1) # delay to give the main process a chance to exit
    # perform an update and restart GSAS-II
    project,version = sys.argv[1:3]
    loc = os.path.dirname(__file__)
    if version:
        print("Regress to version "+str(version))
        svnUpdateDir(loc,version=version)
    else:
        print("Update to current version")
        svnUpdateDir(loc)
    if project:
        print("Restart GSAS-II with project file "+str(project))
        subprocess.Popen([sys.executable,os.path.join(loc,'GSASII.py'),project])
    else:
        print("Restart GSAS-II without a project file ")
        subprocess.Popen([sys.executable,os.path.join(loc,'GSASII.py')])
    print 'exiting update process'
    sys.exit()