/usr/lib/python3/dist-packages/pgspecial/main.py is in python3-pgspecial 1.7.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 | import os
import logging
from collections import namedtuple
from . import export
from .help.commands import helpcommands
log = logging.getLogger(__name__)
NO_QUERY = 0
PARSED_QUERY = 1
RAW_QUERY = 2
PAGER_ALWAYS = 2
PAGER_LONG_OUTPUT = 1
PAGER_OFF = 0
PAGER_MSG = {
PAGER_OFF: "Pager usage is off.",
PAGER_LONG_OUTPUT: "Pager is used for long output.",
PAGER_ALWAYS: "Pager is always used."
}
SpecialCommand = namedtuple('SpecialCommand',
['handler', 'syntax', 'description', 'arg_type', 'hidden', 'case_sensitive'])
@export
class CommandNotFound(Exception):
pass
@export
class PGSpecial(object):
# Default static commands that don't rely on PGSpecial state are registered
# via the special_command decorator and stored in default_commands
default_commands = {}
def __init__(self):
self.timing_enabled = True
self.commands = self.default_commands.copy()
self.timing_enabled = False
self.expanded_output = False
self.auto_expand = False
self.pager_config = PAGER_ALWAYS
self.pager = os.environ.get('PAGER', '')
self.register(self.show_help, '\\?', '\\?', 'Show Commands.',
arg_type=PARSED_QUERY)
self.register(self.toggle_expanded_output, '\\x', '\\x',
'Toggle expanded output.', arg_type=PARSED_QUERY)
self.register(self.call_pset, '\\pset', '\\pset [key] [value]',
'A limited version of traditional \pset', arg_type=PARSED_QUERY)
self.register(self.show_command_help, '\\h', '\\h',
'Show SQL syntax and help.', arg_type=PARSED_QUERY)
self.register(self.toggle_timing, '\\timing', '\\timing',
'Toggle timing of commands.', arg_type=NO_QUERY)
self.register(self.set_pager, '\\pager', '\\pager [command]',
'Set PAGER. Pring the query results via PAGER.',
arg_type=PARSED_QUERY)
def register(self, *args, **kwargs):
register_special_command(*args, command_dict=self.commands, **kwargs)
def execute(self, cur, sql):
commands = self.commands
command, verbose, pattern = parse_special_command(sql)
if (command not in commands) and (command.lower() not in commands):
raise CommandNotFound
try:
special_cmd = commands[command]
except KeyError:
special_cmd = commands[command.lower()]
if special_cmd.case_sensitive:
raise CommandNotFound('Command not found: %s' % command)
if special_cmd.arg_type == NO_QUERY:
return special_cmd.handler()
elif special_cmd.arg_type == PARSED_QUERY:
return special_cmd.handler(cur=cur, pattern=pattern, verbose=verbose)
elif special_cmd.arg_type == RAW_QUERY:
return special_cmd.handler(cur=cur, query=sql)
def show_help(self, pattern, **_):
if pattern.strip():
return self.show_command_help(pattern)
headers = ['Command', 'Description']
result = []
for _, value in sorted(self.commands.items()):
if not value.hidden:
result.append((value.syntax, value.description))
return [(None, result, headers, None)]
def show_command_help_listing(self):
table = chunks(sorted(helpcommands.keys()), 6)
return [(None, table, [], None)]
def show_command_help(self, pattern, **_):
command = pattern.strip().upper()
message = ""
if not command:
return self.show_command_help_listing()
if command in helpcommands:
helpcommand = helpcommands[command]
if "description" in helpcommand:
message += helpcommand["description"]
if "synopsis" in helpcommand:
message += "\nSyntax:\n"
message += helpcommand["synopsis"]
else:
message = "No help available for \"%s\"" % pattern
message += "\nTry \h with no arguments to see available help."
return [(None, None, None, message)]
def toggle_expanded_output(self, pattern, **_):
flag = pattern.strip()
if flag == "auto":
self.auto_expand = True
self.expanded_output = False
return [(None, None, None, u"Expanded display is used automatically.")]
elif flag == "off":
self.expanded_output = False
elif flag == "on":
self.expanded_output = True
else:
self.expanded_output = not (self.expanded_output or self.auto_expand)
self.auto_expand = self.expanded_output
message = u"Expanded display is "
message += u"on." if self.expanded_output else u"off."
return [(None, None, None, message)]
def toggle_timing(self):
self.timing_enabled = not self.timing_enabled
message = "Timing is "
message += "on." if self.timing_enabled else "off."
return [(None, None, None, message)]
def call_pset(self, pattern, **_):
pattern = pattern.split(' ', 2)
val = pattern[1] if len(pattern) > 1 else ''
key = pattern[0]
if hasattr(self, 'pset_' + key):
return getattr(self, 'pset_' + key)(val)
else:
return [(None, None, None, "'%s' is currently not supported by pset" % key)]
def pset_pager(self, value):
if value == 'always':
self.pager_config = PAGER_ALWAYS
elif value == 'off':
self.pager_config = PAGER_OFF
elif value == 'on':
self.pager_config = PAGER_LONG_OUTPUT
elif self.pager_config == PAGER_LONG_OUTPUT:
self.pager_config = PAGER_OFF
else:
self.pager_config = PAGER_LONG_OUTPUT
return [(None, None, None, '%s' % PAGER_MSG[self.pager_config])]
def set_pager(self, pattern, **_):
if not pattern:
if not self.pager:
os.environ.pop('PAGER', None)
msg = 'Pager reset to system default.'
else:
os.environ['PAGER'] = self.pager
msg = 'Reset pager back to default. Default: %s' % self.pager
else:
os.environ['PAGER'] = pattern
msg = 'PAGER set to %s.' % pattern
return [(None, None, None, msg)]
@export
def content_exceeds_width(row, width):
# Account for 3 characters between each column
separator_space = (len(row)*3)
# Add 2 columns for a bit of buffer
line_len = sum([len(x) for x in row]) + separator_space + 2
return line_len > width
@export
def parse_special_command(sql):
command, _, arg = sql.partition(' ')
verbose = '+' in command
command = command.strip().replace('+', '')
return (command, verbose, arg.strip())
def special_command(command, syntax, description, arg_type=PARSED_QUERY,
hidden=False, case_sensitive=True, aliases=()):
"""A decorator used internally for static special commands"""
def wrapper(wrapped):
register_special_command(wrapped, command, syntax, description,
arg_type, hidden, case_sensitive, aliases,
command_dict=PGSpecial.default_commands)
return wrapped
return wrapper
def register_special_command(handler, command, syntax, description,
arg_type=PARSED_QUERY, hidden=False, case_sensitive=True, aliases=(),
command_dict=None):
cmd = command.lower() if not case_sensitive else command
command_dict[cmd] = SpecialCommand(handler, syntax, description, arg_type,
hidden, case_sensitive)
for alias in aliases:
cmd = alias.lower() if not case_sensitive else alias
command_dict[cmd] = SpecialCommand(handler, syntax, description, arg_type,
case_sensitive=case_sensitive,
hidden=True)
def chunks(l, n):
n = max(1, n)
return [l[i:i + n] for i in range(0, len(l), n)]
@special_command('\\e', '\\e [file]', 'Edit the query with external editor.', arg_type=NO_QUERY)
def doc_only():
raise RuntimeError
@special_command('\\ef', '\\ef [funcname [line]]', 'Edit the contents of the query buffer.', arg_type=NO_QUERY, hidden=True)
@special_command('\\sf', '\\sf[+] FUNCNAME', 'Show a function\'s definition.', arg_type=NO_QUERY, hidden=True)
@special_command('\\do', '\\do[S] [pattern]', 'List operators.', arg_type=NO_QUERY, hidden=True)
@special_command('\\dp', '\\dp [pattern]', 'List table, view, and sequence access privileges.', arg_type=NO_QUERY, hidden=True)
@special_command('\\z', '\\z [pattern]', 'Same as \\dp.', arg_type=NO_QUERY, hidden=True)
def place_holder():
raise NotImplementedError
|