mirror of https://github.com/captn3m0/dotfiles.git
102 lines
3.7 KiB
Ruby
102 lines
3.7 KiB
Ruby
# Copyright 2010-2011 Wincent Colaiuta. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# 1. Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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require 'command-t/vim'
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require 'command-t/scanner'
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module CommandT
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# Reads the current directory recursively for the paths to all regular files.
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class FileScanner < Scanner
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class FileLimitExceeded < ::RuntimeError; end
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attr_accessor :path
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def initialize path = Dir.pwd, options = {}
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@paths = {}
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@paths_keys = []
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@path = path
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@max_depth = options[:max_depth] || 15
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@max_files = options[:max_files] || 10_000
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@max_caches = options[:max_caches] || 1
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@scan_dot_directories = options[:scan_dot_directories] || false
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end
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def paths
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return @paths[@path] if @paths.has_key?(@path)
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begin
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ensure_cache_under_limit
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@paths[@path] = []
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@depth = 0
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@files = 0
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@prefix_len = @path.chomp('/').length
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add_paths_for_directory @path, @paths[@path]
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rescue FileLimitExceeded
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end
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@paths[@path]
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end
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def flush
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@paths = {}
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end
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private
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def ensure_cache_under_limit
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# Ruby 1.8 doesn't have an ordered hash, so use a separate stack to
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# track and expire the oldest entry in the cache
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if @max_caches > 0 && @paths_keys.length >= @max_caches
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@paths.delete @paths_keys.shift
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end
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@paths_keys << @path
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end
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def path_excluded? path
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# first strip common prefix (@path) from path to match VIM's behavior
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path = path[(@prefix_len + 1)..-1]
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path = VIM::escape_for_single_quotes path
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::VIM::evaluate("empty(expand(fnameescape('#{path}')))").to_i == 1
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end
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def add_paths_for_directory dir, accumulator
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Dir.foreach(dir) do |entry|
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next if ['.', '..'].include?(entry)
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path = File.join(dir, entry)
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unless path_excluded?(path)
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if File.file?(path)
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@files += 1
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raise FileLimitExceeded if @files > @max_files
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accumulator << path[@prefix_len + 1..-1]
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elsif File.directory?(path)
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next if @depth >= @max_depth
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next if (entry.match(/\A\./) && !@scan_dot_directories)
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@depth += 1
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add_paths_for_directory path, accumulator
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@depth -= 1
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end
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end
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end
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rescue Errno::EACCES
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# skip over directories for which we don't have access
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end
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end # class FileScanner
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end # module CommandT
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