def handle_exit_status(args):
global terminate, in_pipes
if terminate and args:
return
# path expansions
exit_value, args = path_expansions(args)
if exit_value:
os.environ['?'] = str(exit_value)
Shell.printf(args)
terminate = True
return ''
# globbing
args = multi_glob(args)
# run pipes and redirections
if '|' in args:
run_redirections(args, in_pipes)
output, exit_value = run_pipes(args)
else:
# redirections
inp, out, args, exit_value = run_redirections(args, in_pipes)
handle_quotes(args)
command = args.pop(0)
exit_value, output = run_command(command, args, inp=inp, out=out)
in_pipes = False
# exit status
os.environ['?'] = str(exit_value)
return output
def run_utility(command, args, inp=PIPE, out=PIPE):
paths = os.environ['PATH'].split(':')
for path in paths:
realpath = path + '/' + command
if os.path.exists(realpath):
return run_execution(realpath, args, inp=inp, out=out)
Shell.printf('intek-sh: %s: command not found' % command)
return 127, ''
def builtins_unset(variables=[]): # implement unset
exit_value = 0
for variable in variables:
if not check_name(variable):
exit_value = 1
Shell.printf('intek-sh: unset: `%s\': not a valid identifier\n' %
variable)
elif variable in os.environ:
os.environ.pop(variable)
return exit_value, ''
def handle_signal(sig, frame):
global process, terminate
Shell.printf("^C")
terminate = False
if process:
try:
os.kill(process.pid, sig)
terminate = True
except ProcessLookupError:
pass
os.environ['?'] = '130'
def builtins_exit(exit_code='0'): # implement exit
Shell.save_history()
Shell.printf('exit')
exit_value = 0
if exit_code:
if exit_code.isdigit():
exit_value = int(exit_code)
else:
Shell.printf('intek-sh: exit: ' + exit_code)
curses.endwin()
exit_program(exit_value)
def run_command(command, args=[], inp=PIPE, out=PIPE):
global com_sub
built_ins = ('cd', 'printenv', 'export', 'unset', 'exit', 'history',
'clear')
if command in built_ins:
exit_code, output = run_builtins(command, args)
if not com_sub and output and not exit_code and not in_pipes:
Shell.printf(output)
return exit_code, output
elif '/' in command:
return run_execution(command, args, inp=inp, out=out)
elif 'PATH' in os.environ:
return run_utility(command, args, inp=inp, out=out)
Shell.printf('intek-sh: %s: command not found' % command)
return 127, ''
def main():
setup_terminal()
while True:
try:
input_user = process_input()
if check_syntax_shell(input_user):
handle_logic_op(input_user)
except IndexError:
pass
except EOFError:
break
except TypeError:
# when terminate is True
pass
except ValueError:
# outrange chr()
pass
except Exception as e:
Shell.printf(str(e))
reset_terminal()
builtins_exit()
def builtins_export(variables=[]): # implement export
exit_value = 0
output = []
if variables:
for variable in variables:
if '=' in variable:
name, value = variable.split('=', 1)
else: # if variable stands alone, set its value as ''
name = variable
value = ''
if check_name(name):
os.environ[name] = value
else:
exit_value = 1
Shell.printf('intek-sh: export: `%s\': '
'not a valid identifier\n' % variable)
else:
env = builtins_printenv()[1].split('\n')
result = []
for line in env:
result.append('declare -x ' + line.replace('=', '=\"', 1) + '\"')
output = '\n'.join(result)
return exit_value, '\n'.join(output)
def show_error(error):
if error:
Shell.printf(error)
def run_execution(command, args, inp=PIPE, out=PIPE):
global process
output = []
try:
process = Popen([command] + args, stdin=inp, stdout=out, stderr=PIPE)
if out == PIPE and inp == PIPE:
line = process.stdout.readline().decode()
while line:
if not com_sub and not in_pipes:
Shell.printf(line.strip())
output.append(line)
line = process.stdout.readline().decode()
elif out == PIPE:
content = process.stdout.read().decode()
if not com_sub and not in_pipes:
Shell.printf(content)
output.append(content)
for line in process.stderr:
if line.decode() not in ['', '\n']:
Shell.printf(line.decode())
process.wait()
exit_value = process.returncode
except PermissionError:
exit_value = 126
Shell.printf('intek-sh: %s: Permission denied' % command)
except FileNotFoundError:
exit_value = 127
Shell.printf('intek-sh: %s: command not found' % command)
except Exception as e:
exit_value = 1
Shell.printf(str(e))
return exit_value, ''.join(output)