| 1 | from __future__ import print_function
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| 2 |
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| 3 | from errno import EINTR
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| 4 | import time as time_
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| 5 |
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| 6 | from _devbuild.gen import arg_types
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| 7 | from _devbuild.gen.id_kind_asdl import Id
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| 8 | from _devbuild.gen.value_asdl import (value, value_t)
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| 9 | from builtin import read_osh
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| 10 | from core import error
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| 11 | from core.error import e_die_status
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| 12 | from core import optview
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| 13 | from core import pyos
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| 14 | from core import state
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| 15 | from core import vm
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| 16 | from frontend import flag_util
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| 17 | from frontend import match
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| 18 | from frontend import typed_args
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| 19 | from mycpp import mylib
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| 20 | from mycpp.mylib import log
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| 21 | from osh import word_compile
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| 22 |
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| 23 | import posix_ as posix
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| 24 |
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| 25 | from typing import List, Dict, TYPE_CHECKING
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| 26 | if TYPE_CHECKING:
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| 27 | from _devbuild.gen.runtime_asdl import cmd_value
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| 28 | from display import ui
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| 29 | from osh import cmd_eval
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| 30 |
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| 31 | _ = log
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| 32 |
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| 33 |
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| 34 | class Echo(vm._Builtin):
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| 35 | """echo builtin.
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| 36 |
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| 37 | shopt -s simple_echo disables -e and -n.
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| 38 | """
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| 39 |
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| 40 | def __init__(self, exec_opts):
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| 41 | # type: (optview.Exec) -> None
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| 42 | self.exec_opts = exec_opts
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| 43 | self.f = mylib.Stdout()
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| 44 |
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| 45 | # Reuse this constant instance
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| 46 | self.simple_flag = None # type: arg_types.echo
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| 47 |
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| 48 | def _SimpleFlag(self):
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| 49 | # type: () -> arg_types.echo
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| 50 | """For arg.e and arg.n without parsing."""
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| 51 | if self.simple_flag is None:
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| 52 | attrs = {} # type: Dict[str, value_t]
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| 53 | attrs['e'] = value.Bool(False)
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| 54 | attrs['n'] = value.Bool(False)
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| 55 | self.simple_flag = arg_types.echo(attrs)
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| 56 | return self.simple_flag
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| 57 |
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| 58 | def Run(self, cmd_val):
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| 59 | # type: (cmd_value.Argv) -> int
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| 60 | argv = cmd_val.argv[1:]
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| 61 |
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| 62 | if self.exec_opts.simple_echo():
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| 63 | typed_args.DoesNotAccept(cmd_val.proc_args) # Disallow echo (42)
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| 64 | arg = self._SimpleFlag() # Avoid parsing -e -n
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| 65 | else:
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| 66 | attrs, arg_r = flag_util.ParseLikeEcho('echo', cmd_val)
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| 67 | arg = arg_types.echo(attrs.attrs)
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| 68 | argv = arg_r.Rest()
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| 69 |
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| 70 | backslash_c = False # \c terminates input
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| 71 |
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| 72 | if arg.e:
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| 73 | new_argv = [] # type: List[str]
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| 74 | for a in argv:
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| 75 | parts = [] # type: List[str]
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| 76 | lex = match.EchoLexer(a)
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| 77 | while not backslash_c:
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| 78 | id_, s = lex.Next()
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| 79 | if id_ == Id.Eol_Tok: # Note: This is really a NUL terminator
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| 80 | break
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| 81 |
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| 82 | p = word_compile.EvalCStringToken(id_, s)
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| 83 |
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| 84 | # Unusual behavior: '\c' prints what is there and aborts
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| 85 | # processing!
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| 86 | if p is None:
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| 87 | backslash_c = True
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| 88 | break
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| 89 |
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| 90 | parts.append(p)
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| 91 |
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| 92 | new_argv.append(''.join(parts))
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| 93 | if backslash_c: # no more args either
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| 94 | break
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| 95 |
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| 96 | # Replace it
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| 97 | argv = new_argv
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| 98 |
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| 99 | buf = mylib.BufWriter()
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| 100 |
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| 101 | #log('echo argv %s', argv)
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| 102 | for i, a in enumerate(argv):
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| 103 | if i != 0:
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| 104 | buf.write(' ') # arg separator
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| 105 | buf.write(a)
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| 106 |
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| 107 | if not arg.n and not backslash_c:
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| 108 | buf.write('\n')
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| 109 |
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| 110 | self.f.write(buf.getvalue())
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| 111 | return 0
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| 112 |
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| 113 |
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| 114 | class MapFile(vm._Builtin):
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| 115 | """Mapfile / readarray."""
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| 116 |
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| 117 | def __init__(self, mem, errfmt, cmd_ev):
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| 118 | # type: (state.Mem, ui.ErrorFormatter, cmd_eval.CommandEvaluator) -> None
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| 119 | self.mem = mem
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| 120 | self.errfmt = errfmt
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| 121 | self.cmd_ev = cmd_ev
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| 122 |
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| 123 | def Run(self, cmd_val):
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| 124 | # type: (cmd_value.Argv) -> int
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| 125 | attrs, arg_r = flag_util.ParseCmdVal('mapfile', cmd_val)
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| 126 | arg = arg_types.mapfile(attrs.attrs)
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| 127 |
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| 128 | var_name, _ = arg_r.Peek2()
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| 129 | if var_name is None:
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| 130 | var_name = 'MAPFILE'
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| 131 |
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| 132 | lines = [] # type: List[str]
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| 133 | while True:
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| 134 | # bash uses this slow algorithm; YSH could provide read --all-lines
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| 135 | try:
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| 136 | line, eof = read_osh.ReadLineSlowly(self.cmd_ev,
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| 137 | with_eol=not arg.t)
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| 138 | except pyos.ReadError as e:
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| 139 | self.errfmt.PrintMessage("mapfile: read() error: %s" %
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| 140 | posix.strerror(e.err_num))
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| 141 | return 1
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| 142 | if eof:
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| 143 | break
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| 144 | lines.append(line)
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| 145 |
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| 146 | state.BuiltinSetArray(self.mem, var_name, lines)
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| 147 | return 0
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| 148 |
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| 149 |
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| 150 | class Cat(vm._Builtin):
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| 151 | """Internal implementation detail for $(< file)."""
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| 152 |
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| 153 | def __init__(self):
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| 154 | # type: () -> None
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| 155 | vm._Builtin.__init__(self)
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| 156 |
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| 157 | def Run(self, cmd_val):
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| 158 | # type: (cmd_value.Argv) -> int
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| 159 | chunks = [] # type: List[str]
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| 160 | while True:
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| 161 | n, err_num = pyos.Read(0, 4096, chunks)
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| 162 |
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| 163 | if n < 0:
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| 164 | if err_num == EINTR:
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| 165 | pass # retry
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| 166 | else:
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| 167 | # Like the top level IOError handler
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| 168 | e_die_status(2,
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| 169 | 'osh I/O error: %s' % posix.strerror(err_num))
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| 170 | # TODO: Maybe just return 1?
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| 171 |
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| 172 | elif n == 0: # EOF
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| 173 | break
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| 174 |
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| 175 | else:
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| 176 | # Stream it to stdout
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| 177 | assert len(chunks) == 1
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| 178 | mylib.Stdout().write(chunks[0])
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| 179 | chunks.pop()
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| 180 |
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| 181 | return 0
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| 182 |
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| 183 |
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| 184 | class Sleep(vm._Builtin):
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| 185 | """Mimics some of the external sleep."""
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| 186 |
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| 187 | def __init__(self):
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| 188 | # type: () -> None
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| 189 | vm._Builtin.__init__(self)
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| 190 |
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| 191 | def Run(self, cmd_val):
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| 192 | # type: (cmd_value.Argv) -> int
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| 193 | _, arg_r = flag_util.ParseCmdVal('sleep', cmd_val)
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| 194 |
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| 195 | # Only supports integral seconds
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| 196 | # https://pubs.opengroup.org/onlinepubs/9699919799/utilities/sleep.html
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| 197 |
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| 198 | duration, duration_loc = arg_r.Peek2()
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| 199 | if duration is None:
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| 200 | raise error.Usage('expected a number of seconds',
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| 201 | cmd_val.arg_locs[0])
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| 202 | arg_r.Next()
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| 203 | arg_r.Done()
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| 204 |
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| 205 | msg = 'got invalid number of seconds %r' % duration
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| 206 | try:
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| 207 | seconds = float(duration)
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| 208 | except ValueError:
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| 209 | raise error.Usage(msg, duration_loc)
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| 210 |
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| 211 | if seconds < 0:
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| 212 | raise error.Usage(msg, duration_loc)
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| 213 |
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| 214 | time_.sleep(seconds)
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| 215 | return 0
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