def _EvalTildeSub(self, prefix):
"""Evaluates ~ and ~user.
Args:
prefix: The tilde prefix (possibly empty)
"""
if prefix == '':
# First look up the HOME var, and then env var
val = self.mem.GetVar('HOME')
if val.tag == value_e.Str:
return val.s
elif val.tag == value_e.StrArray:
raise AssertionError
s = util.GetHomeDir()
if s is None:
s = '~' + prefix # No expansion I guess
return s
# http://linux.die.net/man/3/getpwnam
try:
e = pwd.getpwnam(prefix)
except KeyError:
s = '~' + prefix
else:
s = e.pw_dir
return s
def InitReadline(complete_cb):
home_dir = os.environ.get('HOME')
if home_dir is None:
home_dir = util.GetHomeDir()
if home_dir is None:
print("Couldn't find home dir in $HOME or /etc/passwd", file=sys.stderr)
return
history_filename = os.path.join(home_dir, 'oil_history')
try:
readline.read_history_file(history_filename)
except IOError:
pass
atexit.register(readline.write_history_file, history_filename)
readline.parse_and_bind("tab: complete")
# How does this map to C?
# https://cnswww.cns.cwru.edu/php/chet/readline/readline.html#SEC45
readline.set_completer(complete_cb)
# NOTE: This apparently matters for -a -n completion -- why? Is space the
# right value?
# http://web.mit.edu/gnu/doc/html/rlman_2.html#SEC39
# "The basic list of characters that signal a break between words for the
# completer routine. The default value of this variable is the characters
# which break words for completion in Bash, i.e., " \t\n\"\\'`@$><=;|&{(""
#
# Hm I don't get this.
readline.set_completer_delims(' ')
def _InitVarsFromEnv(self, environ):
# This is the way dash and bash work -- at startup, they turn everything in
# 'environ' variable into shell variables. Bash has an export_env
# variable. Dash has a loop through environ in init.c
for n, v in environ.iteritems():
self.SetVar(ast.LhsName(n), runtime.Str(v),
(var_flags_e.Exported, ), scope_e.GlobalOnly)
# If it's not in the environment, initialize it. This makes it easier to
# update later in ExecOpts.
# TODO: IFS, PWD, etc. should follow this pattern. Maybe need a SysCall
# interface? self.syscall.getcwd() etc.
v = self.GetVar('SHELLOPTS')
if v.tag == value_e.Undef:
SetGlobalString(self, 'SHELLOPTS', '')
# Now make it readonly
self.SetVar(ast.LhsName('SHELLOPTS'), None, (var_flags_e.ReadOnly, ),
scope_e.GlobalOnly)
v = self.GetVar('HOME')
if v.tag == value_e.Undef:
home_dir = util.GetHomeDir() or '~' # No expansion if not found?
SetGlobalString(self, 'HOME', home_dir)