Method rehashx

IPython/core/magics/osm.py:203–280

Update the alias table with all executable files in $PATH. rehashx explicitly checks that every entry in $PATH is a file with execute access (os.X_OK). Under Windows, it checks executability as a match against a '|'-separated string of extensions, stored in the IPyt

(self, parameter_s='')

    @line_magic
    def rehashx(self, parameter_s=''):
        """Update the alias table with all executable files in $PATH.

        rehashx explicitly checks that every entry in $PATH is a file
        with execute access (os.X_OK).

        Under Windows, it checks executability as a match against a
        '|'-separated string of extensions, stored in the IPython config
        variable win_exec_ext.  This defaults to 'exe|com|bat'.

        This function also resets the root module cache of module completer,
        used on slow filesystems.
        """
        from IPython.core.alias import InvalidAliasError

        # for the benefit of module completer in ipy_completers.py
        del self.shell.db['rootmodules_cache']

        path = [os.path.abspath(os.path.expanduser(p)) for p in
            os.environ.get('PATH','').split(os.pathsep)]

        syscmdlist = []
        savedir = os.getcwd()

        # Now walk the paths looking for executables to alias.
        try:
            # write the whole loop for posix/Windows so we don't have an if in
            # the innermost part
            if self.is_posix:
                for pdir in path:
                    try:
                        os.chdir(pdir)
                    except OSError:
                        continue

                    # for python 3.6+ rewrite to: with os.scandir(pdir) as dirlist:
                    dirlist = os.scandir(path=pdir)
                    for ff in dirlist:
                        if self.isexec(ff):
                            fname = ff.name
                            try:
                                # Removes dots from the name since ipython
                                # will assume names with dots to be python.
                                if not self.shell.alias_manager.is_alias(fname):
                                    self.shell.alias_manager.define_alias(
                                        fname.replace('.',''), fname)
                            except InvalidAliasError:
                                pass
                            else:
                                syscmdlist.append(fname)
            else:
                no_alias = Alias.blacklist
                for pdir in path:
                    try:
                        os.chdir(pdir)
                    except OSError:
                        continue