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
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83 | # processing!
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84 | if p is None:
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85 | backslash_c = True
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86 | break
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87 |
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88 | parts.append(p)
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89 |
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90 | new_argv.append(''.join(parts))
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91 | if backslash_c: # no more args either
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92 | break
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93 |
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94 | # Replace it
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95 | argv = new_argv
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96 |
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97 | buf = mylib.BufWriter()
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98 |
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99 | #log('echo argv %s', argv)
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100 | for i, a in enumerate(argv):
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101 | if i != 0:
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102 | buf.write(' ') # arg separator
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103 | buf.write(a)
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104 |
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105 | if not arg.n and not backslash_c:
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106 | buf.write('\n')
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107 |
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108 | self.f.write(buf.getvalue())
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109 | return 0
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110 |
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111 |
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112 | class MapFile(vm._Builtin):
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113 | """Mapfile / readarray."""
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114 |
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115 | def __init__(self, mem, errfmt, cmd_ev):
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116 | # type: (state.Mem, ui.ErrorFormatter, cmd_eval.CommandEvaluator) -> None
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117 | self.mem = mem
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118 | self.errfmt = errfmt
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119 | self.cmd_ev = cmd_ev
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120 |
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121 | def Run(self, cmd_val):
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122 | # type: (cmd_value.Argv) -> int
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123 | attrs, arg_r = flag_util.ParseCmdVal('mapfile', cmd_val)
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124 | arg = arg_types.mapfile(attrs.attrs)
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125 |
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126 | var_name, _ = arg_r.Peek2()
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127 | if var_name is None:
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128 | var_name = 'MAPFILE'
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129 |
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130 | lines = [] # type: List[str]
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131 | while True:
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132 | # bash uses this slow algorithm; YSH could provide read --all-lines
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133 | try:
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134 | line, _ = read_osh.ReadLineSlowly(self.cmd_ev,
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135 | with_eol=not arg.t)
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136 | except pyos.ReadError as e:
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137 | self.errfmt.PrintMessage("mapfile: read() error: %s" %
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138 | posix.strerror(e.err_num))
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139 | return 1
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140 | if len(line) == 0:
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141 | break
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142 | lines.append(line)
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143 |
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144 | state.BuiltinSetArray(self.mem, var_name, lines)
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145 | return 0
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146 |
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147 |
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148 | class Cat(vm._Builtin):
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149 | """Internal implementation detail for $(< file).
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150 |
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151 | Maybe expose this as 'builtin cat' ?
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152 | """
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153 |
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154 | def __init__(self):
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155 | # type: () -> None
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156 | """Empty constructor for mycpp."""
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157 | vm._Builtin.__init__(self)
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158 |
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159 | def Run(self, cmd_val):
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160 | # type: (cmd_value.Argv) -> int
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161 | chunks = [] # type: List[str]
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162 | while True:
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163 | n, err_num = pyos.Read(0, 4096, chunks)
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164 |
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165 | if n < 0:
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166 | if err_num == EINTR:
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167 | pass # retry
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168 | else:
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169 | # Like the top level IOError handler
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170 | e_die_status(2,
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171 | 'osh I/O error: %s' % posix.strerror(err_num))
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172 | # TODO: Maybe just return 1?
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173 |
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174 | elif n == 0: # EOF
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175 | break
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176 |
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177 | else:
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178 | # Stream it to stdout
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179 | assert len(chunks) == 1
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180 | mylib.Stdout().write(chunks[0])
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181 | chunks.pop()
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182 |
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183 | return 0
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