Module: Overcommit::Utils

Defined in:
lib/overcommit/utils.rb,
lib/overcommit/utils/file_utils.rb,
lib/overcommit/utils/messages_utils.rb

Overview

Utility functions for general use.

Defined Under Namespace

Modules: FileUtils, MessagesUtils Classes: Version

Class Attribute Summary collapse

Class Method Summary collapse

Class Attribute Details

.log ⇒ Overcommit::Logger

Returns logger with which to send debug output.

Returns:



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# File 'lib/overcommit/utils.rb', line 33

def log
  @log
end

Class Method Details

.broken_symlink?(file) ⇒ true, false

Returns whether a file is a broken symlink.

Returns:

  • (true, false) 


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# File 'lib/overcommit/utils.rb', line 240

def broken_symlink?(file)
  # JRuby's implementation of File.exist? returns true for broken
  # symlinks, so we need use File.size?
  Overcommit::Utils::FileUtils.symlink?(file) && File.size?(file).nil?
end

.camel_case(str) ⇒ Object

Converts a string containing underscores/hyphens/spaces into CamelCase.



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# File 'lib/overcommit/utils.rb', line 98

def camel_case(str)
  str.split(/_|-| /).map { |part| part.sub(/^\w/, &:upcase) }.join
end

.convert_glob_to_absolute(glob) ⇒ String

Convert a glob pattern to an absolute path glob pattern rooted from the repository root directory.

Parameters:

  • glob (String)

Returns:

  • (String) 


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# File 'lib/overcommit/utils.rb', line 251

def convert_glob_to_absolute(glob)
  File.join(repo_root, glob)
end

.execute(initial_args, options = {}) ⇒ Overcommit::Subprocess::Result

Execute a command in a subprocess, capturing exit status and output from both standard and error streams.

This is intended to provide a centralized place to perform any checks or filtering of the command before executing it.

The ‘args` option provides a convenient way of splitting up long argument lists which would otherwise exceed the maximum command line length of the OS. It will break up the list into chunks and run the command with the same prefix `initial_args`, finally combining the output together at the end.

This requires that the external command you are running can have its work split up in this way and still produce the same resultant output when outputs of the individual commands are concatenated back together.

Parameters:

  • initial_args (Array<String>)
  • options (Hash) (defaults to: {})

Options Hash (options):

  • :args (Array<String>) —

    long list of arguments to split up

Returns:



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# File 'lib/overcommit/utils.rb', line 179

def execute(initial_args, options = {})
  if initial_args.include?('|')
    raise Overcommit::Exceptions::InvalidCommandArgs,
          'Cannot pipe commands with the `execute` helper'
  end

  result =
    if (splittable_args = options.fetch(:args) { [] }).any?
      debug(initial_args.join(' ') + " ... (#{splittable_args.length} splittable args)")
      Overcommit::CommandSplitter.execute(initial_args, options)
    else
      debug(initial_args.join(' '))
      Overcommit::Subprocess.spawn(initial_args, options)
    end

  debug("EXIT STATUS: #{result.status}")
  debug("STDOUT: #{result.stdout.inspect}")
  debug("STDERR: #{result.stderr.inspect}")

  result
end

.execute_in_background(args) ⇒ ChildProcess

Execute a command in a subprocess, returning immediately.

This provides a convenient way to execute long-running processes for which we do not need to know the result.

Parameters:

  • args (Array<String>)

Returns:

  • (ChildProcess) —

    detached process spawned in the background



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# File 'lib/overcommit/utils.rb', line 208

def execute_in_background(args)
  if args.include?('|')
    raise Overcommit::Exceptions::InvalidCommandArgs,
          'Cannot pipe commands with the `execute_in_background` helper'
  end

  debug("Spawning background task: #{args.join(' ')}")
  Subprocess.spawn_detached(args)
end

.git_dir ⇒ String

Returns an absolute path to the .git directory for a repo.

Returns:

  • (String) 


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# File 'lib/overcommit/utils.rb', line 62

def git_dir
  @git_dir ||=
    begin
      cmd = %w[git rev-parse]
      cmd << (GIT_VERSION < '2.5' ? '--git-dir' : '--git-common-dir')
      result = execute(cmd)
      unless result.success?
        raise Overcommit::Exceptions::InvalidGitRepo,
              'Unable to determine location of GIT_DIR. ' \
              'Not a recognizable Git repository!'
      end
      File.expand_path(result.stdout.chomp("\n"), Dir.pwd)
    end
end

.in_path?(cmd) ⇒ true, false

Returns whether a command can be found given the current environment path.

Parameters:

  • cmd (String)

Returns:

  • (true, false) —

    whether a command can be found given the current environment path.



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# File 'lib/overcommit/utils.rb', line 120

def in_path?(cmd)
  # ENV['PATH'] doesn't include the repo root, but that is a valid
  # location for executables, so we want to add it to the list of places
  # we are checking for the executable.
  paths = [repo_root] + ENV['PATH'].split(File::PATH_SEPARATOR)
  exts  = ENV['PATHEXT'] ? ENV['PATHEXT'].split(';') : ['']
  paths.each do |path|
    exts.each do |ext|
      cmd_with_ext = cmd.upcase.end_with?(ext.upcase) ? cmd : "#{cmd}#{ext}"
      full_path = File.join(path, cmd_with_ext)
      return true if File.executable?(full_path)
    end
  end
  false
end

.matches_path?(pattern, path) ⇒ Boolean

Return whether a pattern matches the given path.

Parameters:

  • pattern (String)
  • path (String)

Returns:

  • (Boolean) 


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# File 'lib/overcommit/utils.rb', line 259

def matches_path?(pattern, path)
  File.fnmatch?(
    pattern, path,
    File::FNM_PATHNAME | # Wildcard doesn't match separator
    File::FNM_DOTMATCH   # Wildcards match dotfiles
  )
end

.parent_command ⇒ String?

Return the parent command that triggered this hook run

Returns:

  • (String, nil) —

    the command as a string, if a parent exists.



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# File 'lib/overcommit/utils.rb', line 139

def parent_command
  # When run in Docker containers, there may be no parent process.
  return if Process.ppid.zero?

  if OS.windows?
    `wmic process where ProcessId=#{Process.ppid} get CommandLine /FORMAT:VALUE`.
      strip.
      slice(/(?<=CommandLine=).+/)
  elsif OS.cygwin?
    # Cygwin's `ps` command behaves differently than the traditional
    # Linux version, but a comparable `procps` is provided to compensate.
    `procps -ocommand= -p #{Process.ppid}`.chomp
  else
    `ps -ocommand= -p #{Process.ppid}`.chomp
  end
rescue Errno::EPERM, Errno::ENOENT
  # Process information may not be available, such as inside sandboxed environments
  nil
end

.processor_count ⇒ Object

Return the number of processors used by the OS for process scheduling.



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# File 'lib/overcommit/utils.rb', line 219

def processor_count
  @processor_count ||= Etc.nprocessors
end

.repo_root ⇒ String

Returns an absolute path to the root of the repository.

We do this ourselves rather than call ‘git rev-parse –show-toplevel` to solve an issue where the .git directory might not actually be valid in tests.

Returns:

  • (String) 


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# File 'lib/overcommit/utils.rb', line 46

def repo_root
  @repo_root ||=
    begin
      result = execute(%w[git rev-parse --show-toplevel])
      unless result.success?
        raise Overcommit::Exceptions::InvalidGitRepo,
              'Unable to determine location of GIT_DIR. ' \
              'Not a recognizable Git repository!'
      end
      result.stdout.chomp("\n")
    end
end

.script_path(script) ⇒ Object 



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# File 'lib/overcommit/utils.rb', line 35

def script_path(script)
  File.join(Overcommit::HOME, 'libexec', script)
end

.snake_case(str) ⇒ Object

Shamelessly stolen from: stackoverflow.com/questions/1509915/converting-camel-case-to-underscore-case-in-ruby



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# File 'lib/overcommit/utils.rb', line 89

def snake_case(str)
  str.gsub(/::/, '/').
      gsub(/([A-Z]+)([A-Z][a-z])/, '\1_\2').
      gsub(/([a-z\d])([A-Z])/, '\1_\2').
      tr('-', '_').
      downcase
end

.strip_color_codes(text) ⇒ String

Remove ANSI escape sequences from a string.

This is useful for stripping colorized output from external tools.

Parameters:

  • text (String)

Returns:

  • (String) 


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# File 'lib/overcommit/utils.rb', line 83

def strip_color_codes(text)
  text.gsub(/\e\[(\d+)(;\d+)*m/, '')
end

.supported_hook_type_classes ⇒ Object

Returns a list of supported hook classes (PreCommit, CommitMsg, etc.)



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# File 'lib/overcommit/utils.rb', line 111

def supported_hook_type_classes
  supported_hook_types.map do |file|
    file.split('-').map(&:capitalize).join
  end
end

.supported_hook_types ⇒ Object

Returns a list of supported hook types (pre-commit, commit-msg, etc.)



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# File 'lib/overcommit/utils.rb', line 103

def supported_hook_types
  Dir[File.join(HOOK_DIRECTORY, '*')].
    select { |file| File.directory?(file) }.
    reject { |file| File.basename(file) == 'shared' }.
    map { |file| File.basename(file).tr('_', '-') }
end

.with_environment(env) ⇒ Object

Calls a block of code with a modified set of environment variables, restoring them once the code has executed.



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# File 'lib/overcommit/utils.rb', line 225

def with_environment(env)
  old_env = {}
  env.each do |var, value|
    old_env[var] = ENV[var.to_s]
    ENV[var.to_s] = value
  end

  yield
ensure
  old_env.each { |var, value| ENV[var.to_s] = value }
end