Module: Utils::Shell

Included in:
Formula
Defined in:
utils/shell.rb

Constant Summary collapse

SHELL_PROFILE_MAP = 
{
  bash: "~/.profile",
  csh:  "~/.cshrc",
  fish: "~/.config/fish/config.fish",
  ksh:  "~/.kshrc",
  mksh: "~/.kshrc",
  sh:   "~/.profile",
  tcsh: "~/.tcshrc",
  zsh:  "~/.zshrc",
}.freeze
UNSAFE_SHELL_CHAR = 
%r{([^A-Za-z0-9_\-.,:/@~\n])}.freeze

Class Method Summary collapse

Class Method Details

.csh_quote(str) ⇒ String

Parameters:

Returns:



102
103
104
105
106
107
108
109
110
111
112
113
 
# File 'utils/shell.rb', line 102

def csh_quote(str)
  # ruby's implementation of shell_escape
  str = str.to_s
  return "''" if str.empty?

  str = str.dup
  # anything that isn't a known safe character is padded
  str.gsub!(UNSAFE_SHELL_CHAR, "\\\\" + "\\1") # rubocop:disable Style/StringConcatenation
  # newlines have to be specially quoted in csh
  str.gsub!(/\n/, "'\\\n'")
  str
end

.export_value(key, value, shell = preferred) ⇒ String?

Quote values. Quoting keys is overkill.

Parameters:

Returns:



36
37
38
39
40
41
42
43
44
45
46
47
48
 
# File 'utils/shell.rb', line 36

def export_value(key, value, shell = preferred)
  case shell
  when :bash, :ksh, :mksh, :sh, :zsh
    "export #{key}=\"#{sh_quote(value)}\""
  when :fish
    # fish quoting is mostly Bourne compatible except that
    # a single quote can be included in a single-quoted string via \'
    # and a literal \ can be included via \\
    "set -gx #{key} \"#{sh_quote(value)}\""
  when :csh, :tcsh
    "setenv #{key} #{csh_quote(value)};"
  end
end

.from_path(path) ⇒ Symbol?

Take a path and heuristically convert it to a shell name, return nil if there’s no match.

Parameters:

Returns:



11
12
13
14
15
16
17
 
# File 'utils/shell.rb', line 11

def from_path(path)
  # we only care about the basename
  shell_name = File.basename(path)
  # handle possible version suffix like `zsh-5.2`
  shell_name.sub!(/-.*\z/m, "")
  shell_name.to_sym if %w[bash csh fish ksh mksh sh tcsh zsh].include?(shell_name)
end

.parent ⇒ Symbol?

Returns:



30
31
32
 
# File 'utils/shell.rb', line 30

def parent
  from_path(`ps -p #{Process.ppid} -o ucomm=`.strip)
end

.preferred ⇒ Symbol?

Returns:



25
26
27
 
# File 'utils/shell.rb', line 25

def preferred
  from_path(preferred_path)
end

.preferred_path(default: "") ⇒ String

Parameters:

  • default (String) (defaults to: "")

Returns:



20
21
22
 
# File 'utils/shell.rb', line 20

def preferred_path(default: "")
  ENV.fetch("SHELL", default)
end

.prepend_path_in_profile(path) ⇒ String?

Parameters:

Returns:



77
78
79
80
81
82
83
84
85
86
 
# File 'utils/shell.rb', line 77

def prepend_path_in_profile(path)
  case preferred
  when :bash, :ksh, :mksh, :sh, :zsh, nil
    "echo 'export PATH=\"#{sh_quote(path)}:$PATH\"' >> #{profile}"
  when :csh, :tcsh
    "echo 'setenv PATH #{csh_quote(path)}:$PATH' >> #{profile}"
  when :fish
    "fish_add_path #{sh_quote(path)}"
  end
end

.profile ⇒ String

Return the shell profile file based on user’s preferred shell.

Returns:



52
53
54
55
56
57
58
59
60
61
62
 
# File 'utils/shell.rb', line 52

def profile
  case preferred
  when :bash
    bash_profile = "#{Dir.home}/.bash_profile"
    return bash_profile if File.exist? bash_profile
  when :zsh
    return "#{ENV["ZDOTDIR"]}/.zshrc" if ENV["ZDOTDIR"].present?
  end

  SHELL_PROFILE_MAP.fetch(preferred, "~/.profile")
end

.set_variable_in_profile(variable, value) ⇒ String?

Parameters:

Returns:



65
66
67
68
69
70
71
72
73
74
 
# File 'utils/shell.rb', line 65

def set_variable_in_profile(variable, value)
  case preferred
  when :bash, :ksh, :sh, :zsh, nil
    "echo 'export #{variable}=#{sh_quote(value)}' >> #{profile}"
  when :csh, :tcsh
    "echo 'setenv #{variable} #{csh_quote(value)}' >> #{profile}"
  when :fish
    "echo 'set -gx #{variable} #{sh_quote(value)}' >> #{profile}"
  end
end

.sh_quote(str) ⇒ String

Parameters:

Returns:



116
117
118
119
120
121
122
123
124
125
126
 
# File 'utils/shell.rb', line 116

def sh_quote(str)
  # ruby's implementation of shell_escape
  str = str.to_s
  return "''" if str.empty?

  str = str.dup
  # anything that isn't a known safe character is padded
  str.gsub!(UNSAFE_SHELL_CHAR, "\\\\" + "\\1") # rubocop:disable Style/StringConcatenation
  str.gsub!(/\n/, "'\n'")
  str
end