| 1 | #!/usr/bin/env python2
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| 2 | """
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| 3 | builtin_lib.py - Builtins that are bindings to libraries, e.g. GNU readline.
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| 4 | """
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| 5 | from __future__ import print_function
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| 6 |
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| 7 | from _devbuild.gen import arg_types
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| 8 | from _devbuild.gen.syntax_asdl import loc
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| 9 | from core.error import e_usage
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| 10 | from core import pyutil
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| 11 | from core import vm
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| 12 | from frontend import flag_util
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| 13 | from mycpp import mops
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| 14 | from mycpp import mylib
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| 15 |
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| 16 | from typing import Optional, TYPE_CHECKING
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| 17 | if TYPE_CHECKING:
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| 18 | from _devbuild.gen.runtime_asdl import cmd_value
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| 19 | from frontend.py_readline import Readline
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| 20 | from core.ui import ErrorFormatter
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| 21 | from core import shell
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| 22 |
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| 23 |
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| 24 | class Bind(vm._Builtin):
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| 25 | """For :, true, false."""
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| 26 |
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| 27 | def __init__(self, readline, errfmt):
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| 28 | # type: (Optional[Readline], ErrorFormatter) -> None
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| 29 | self.readline = readline
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| 30 | self.errfmt = errfmt
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| 31 |
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| 32 | def Run(self, cmd_val):
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| 33 | # type: (cmd_value.Argv) -> int
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| 34 | self.errfmt.Print_("warning: bind isn't implemented",
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| 35 | blame_loc=cmd_val.arg_locs[0])
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| 36 | return 1
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| 37 |
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| 38 |
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| 39 | class History(vm._Builtin):
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| 40 | """Show interactive command history."""
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| 41 |
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| 42 | def __init__(
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| 43 | self,
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| 44 | readline, # type: Optional[Readline]
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| 45 | sh_files, # type: shell.ShellFiles
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| 46 | errfmt, # type: ErrorFormatter
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| 47 | f, # type: mylib.Writer
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| 48 | ):
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| 49 | # type: (...) -> None
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| 50 | self.readline = readline
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| 51 | self.sh_files = sh_files
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| 52 | self.errfmt = errfmt
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| 53 | self.f = f # this hook is for unit testing only
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| 54 |
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| 55 | def Run(self, cmd_val):
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| 56 | # type: (cmd_value.Argv) -> int
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| 57 | # NOTE: This builtin doesn't do anything in non-interactive mode in bash?
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| 58 | # It silently exits zero.
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| 59 | # zsh -c 'history' produces an error.
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| 60 | readline = self.readline
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| 61 | if not readline:
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| 62 | e_usage("is disabled because Oil wasn't compiled with 'readline'",
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| 63 | loc.Missing)
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| 64 |
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| 65 | attrs, arg_r = flag_util.ParseCmdVal('history', cmd_val)
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| 66 | arg = arg_types.history(attrs.attrs)
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| 67 |
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| 68 | # Clear all history
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| 69 | if arg.c:
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| 70 | readline.clear_history()
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| 71 | return 0
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| 72 |
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| 73 | if arg.a:
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| 74 | hist_file = self.sh_files.HistoryFile()
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| 75 | if hist_file is None:
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| 76 | return 1
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| 77 |
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| 78 | try:
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| 79 | readline.write_history_file(hist_file)
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| 80 | except (IOError, OSError) as e:
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| 81 | self.errfmt.Print_(
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| 82 | 'Error writing HISTFILE %r: %s' %
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| 83 | (hist_file, pyutil.strerror(e)), loc.Missing)
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| 84 | return 1
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| 85 |
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| 86 | return 0
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| 87 |
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| 88 | if arg.r:
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| 89 | hist_file = self.sh_files.HistoryFile()
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| 90 | if hist_file is None:
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| 91 | return 1
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| 92 |
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| 93 | try:
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| 94 | readline.read_history_file(hist_file)
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| 95 | except (IOError, OSError) as e:
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| 96 | self.errfmt.Print_(
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| 97 | 'Error reading HISTFILE %r: %s' %
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| 98 | (hist_file, pyutil.strerror(e)), loc.Missing)
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| 99 | return 1
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| 100 |
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| 101 | return 0
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| 102 |
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| 103 | # Delete history entry by id number
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| 104 | arg_d = mops.BigTruncate(arg.d)
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| 105 | if arg_d >= 0:
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| 106 | cmd_index = arg_d - 1
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| 107 |
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| 108 | try:
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| 109 | readline.remove_history_item(cmd_index)
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| 110 | except ValueError:
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| 111 | e_usage("couldn't find item %d" % arg_d, loc.Missing)
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| 112 |
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| 113 | return 0
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| 114 |
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| 115 | # Returns 0 items in non-interactive mode?
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| 116 | num_items = readline.get_current_history_length()
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| 117 | #log('len = %d', num_items)
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| 118 |
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| 119 | num_arg, num_arg_loc = arg_r.Peek2()
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| 120 |
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| 121 | if num_arg is None:
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| 122 | start_index = 1
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| 123 | else:
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| 124 | try:
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| 125 | num_to_show = int(num_arg)
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| 126 | except ValueError:
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| 127 | e_usage('got invalid argument %r' % num_arg, num_arg_loc)
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| 128 | start_index = max(1, num_items + 1 - num_to_show)
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| 129 |
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| 130 | arg_r.Next()
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| 131 | if not arg_r.AtEnd():
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| 132 | e_usage('got too many arguments', loc.Missing)
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| 133 |
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| 134 | # TODO:
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| 135 | # - Exclude lines that don't parse from the history! bash and zsh don't do
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| 136 | # that.
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| 137 | # - Consolidate multiline commands.
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| 138 |
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| 139 | for i in xrange(start_index, num_items + 1): # 1-based index
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| 140 | item = readline.get_history_item(i)
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| 141 | self.f.write('%5d %s\n' % (i, item))
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| 142 | return 0
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