Class: SimpleCov::CLI::Watch::Poller

Inherits:
Object
  • Object
show all
Defined in:
lib/simplecov/cli/watch/poller.rb

Overview

Watches a fixed set of paths by polling mtimes, the trade chosen over a filesystem-event dependency for a command that is optional to begin with. Editors that save through a temporary file plus rename still move the final path's mtime, which is all this looks at.

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Poller

Returns a new instance of Poller.



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# File 'lib/simplecov/cli/watch/poller.rb', line 11

def initialize
  @snapshot = {} #: Hash[String, untyped]
end

Instance Method Details

#changes ⇒ Object 



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# File 'lib/simplecov/cli/watch/poller.rb', line 25

def changes
  changed = [] #: Array[String]
  @snapshot.each_key do |path|
    now = stamp(path)
    next if now.eql?(@snapshot.fetch(path))

    @snapshot[path] = now
    changed << path
  end
  changed
end

#size ⇒ Object 



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# File 'lib/simplecov/cli/watch/poller.rb', line 21

def size
  @snapshot.size
end

#stamp(path) ⇒ Object 



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# File 'lib/simplecov/cli/watch/poller.rb', line 37

def stamp(path)
  File.mtime(path)
rescue SystemCallError
  nil
end

#watch(paths) ⇒ Object

Replaces the watched set, snapshotting current mtimes. A path with no file snapshots as nil, so appearing counts as a change.



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# File 'lib/simplecov/cli/watch/poller.rb', line 17

def watch(paths)
  @snapshot = paths.to_h { |path| [path, stamp(path)] }
end