| 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 |
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| 5 | from _devbuild.gen import arg_types
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| 6 | from _devbuild.gen.id_kind_asdl import Id
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| 7 | from _devbuild.gen.value_asdl import (value, value_t)
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| 8 | from builtin import read_osh
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| 9 | from core.error import e_die_status
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| 10 | from frontend import flag_util
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| 11 | from frontend import match
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| 12 | from frontend import typed_args
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| 13 | from core import optview
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| 14 | from core import pyos
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| 15 | from core import state
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| 16 | from core import vm
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| 17 | from mycpp import mylib
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| 18 | from mycpp.mylib import log
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| 19 | from osh import word_compile
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| 20 |
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| 21 | import posix_ as posix
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| 22 |
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| 23 | from typing import List, Dict, TYPE_CHECKING
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| 24 | if TYPE_CHECKING:
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| 25 | from _devbuild.gen.runtime_asdl import cmd_value
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| 26 | from core import ui
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| 27 | from osh import cmd_eval
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| 28 |
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| 29 | _ = log
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| 30 |
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| 31 |
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| 32 | class Echo(vm._Builtin):
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| 33 | """echo builtin.
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| 34 |
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| 35 | shopt -s simple_echo disables -e and -n.
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| 36 | """
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| 37 |
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| 38 | def __init__(self, exec_opts):
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| 39 | # type: (optview.Exec) -> None
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| 40 | self.exec_opts = exec_opts
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| 41 | self.f = mylib.Stdout()
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| 42 |
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| 43 | # Reuse this constant instance
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| 44 | self.simple_flag = None # type: arg_types.echo
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| 45 |
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| 46 | def _SimpleFlag(self):
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| 47 | # type: () -> arg_types.echo
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| 48 | """For arg.e and arg.n without parsing."""
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| 49 | if self.simple_flag is None:
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| 50 | attrs = {} # type: Dict[str, value_t]
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| 51 | attrs['e'] = value.Bool(False)
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| 52 | attrs['n'] = value.Bool(False)
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| 53 | self.simple_flag = arg_types.echo(attrs)
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| 54 | return self.simple_flag
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| 55 |
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| 56 | def Run(self, cmd_val):
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| 57 | # type: (cmd_value.Argv) -> int
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| 58 | argv = cmd_val.argv[1:]
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| 59 |
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| 60 | if self.exec_opts.simple_echo():
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| 61 | typed_args.DoesNotAccept(cmd_val.typed_args) # Disallow echo (42)
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| 62 | arg = self._SimpleFlag() # Avoid parsing -e -n
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| 63 | else:
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| 64 | attrs, arg_r = flag_util.ParseLikeEcho('echo', cmd_val)
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| 65 | arg = arg_types.echo(attrs.attrs)
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| 66 | argv = arg_r.Rest()
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| 67 |
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| 68 | backslash_c = False # \c terminates input
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| 69 |
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| 70 | if arg.e:
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| 71 | new_argv = [] # type: List[str]
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| 72 | for a in argv:
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| 73 | parts = [] # type: List[str]
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| 74 | lex = match.EchoLexer(a)
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| 75 | while not backslash_c:
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| 76 | id_, s = lex.Next()
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| 77 | if id_ == Id.Eol_Tok: # Note: This is really a NUL terminator
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| 78 | break
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| 79 |
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| 80 | p = word_compile.EvalCStringToken(id_, s)
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| 81 |
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| 82 | # Unusual behavior: '\c' prints what is there and aborts processing!
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| 83 | if p is None:
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| 84 | backslash_c = True
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| 85 | break
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| 86 |
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| 87 | parts.append(p)
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| 88 |
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| 89 | new_argv.append(''.join(parts))
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| 90 | if backslash_c: # no more args either
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| 91 | break
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| 92 |
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| 93 | # Replace it
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| 94 | argv = new_argv
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| 95 |
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| 96 | #log('echo argv %s', argv)
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| 97 | for i, a in enumerate(argv):
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| 98 | if i != 0:
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| 99 | self.f.write(' ') # arg separator
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| 100 | self.f.write(a)
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| 101 |
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| 102 | if not arg.n and not backslash_c:
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| 103 | self.f.write('\n')
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| 104 |
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| 105 | return 0
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| 106 |
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| 107 |
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| 108 | class MapFile(vm._Builtin):
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| 109 | """Mapfile / readarray."""
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| 110 |
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| 111 | def __init__(self, mem, errfmt, cmd_ev):
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| 112 | # type: (state.Mem, ui.ErrorFormatter, cmd_eval.CommandEvaluator) -> None
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| 113 | self.mem = mem
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| 114 | self.errfmt = errfmt
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| 115 | self.cmd_ev = cmd_ev
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| 116 |
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| 117 | def Run(self, cmd_val):
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| 118 | # type: (cmd_value.Argv) -> int
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| 119 | attrs, arg_r = flag_util.ParseCmdVal('mapfile', cmd_val)
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| 120 | arg = arg_types.mapfile(attrs.attrs)
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| 121 |
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| 122 | var_name, _ = arg_r.Peek2()
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| 123 | if var_name is None:
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| 124 | var_name = 'MAPFILE'
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| 125 |
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| 126 | lines = [] # type: List[str]
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| 127 | while True:
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| 128 | # bash uses this slow algorithm; YSH could provide read --all-lines
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| 129 | try:
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| 130 | line = read_osh.ReadLineSlowly(self.cmd_ev)
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| 131 | except pyos.ReadError as e:
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| 132 | self.errfmt.PrintMessage("mapfile: read() error: %s" %
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| 133 | posix.strerror(e.err_num))
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| 134 | return 1
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| 135 | if len(line) == 0:
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| 136 | break
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| 137 | # note: at least on Linux, bash doesn't strip \r\n
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| 138 | if arg.t and line.endswith('\n'):
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| 139 | line = line[:-1]
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| 140 | lines.append(line)
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| 141 |
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| 142 | state.BuiltinSetArray(self.mem, var_name, lines)
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| 143 | return 0
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| 144 |
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| 145 |
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| 146 | class Cat(vm._Builtin):
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| 147 | """Internal implementation detail for $(< file).
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| 148 |
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| 149 | Maybe expose this as 'builtin cat' ?
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| 150 | """
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| 151 |
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| 152 | def __init__(self):
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| 153 | # type: () -> None
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| 154 | """Empty constructor for mycpp."""
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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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