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+#!/usr/bin/env ruby
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+
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+#
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+# mtime_cache
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+# Copyright (c) 2016 Borislav Stanimirov
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+#
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+# Permission is hereby granted, free of charge, to any person obtaining a copy
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+# of this software and associated documentation files (the "Software"), to
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+# deal in the Software without restriction, including without limitation the
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+# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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+# sell copies of the Software, and to permit persons to whom the Software is
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+# furnished to do so, subject to the following conditions:
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+#
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+# The above copyright notice and this permission notice shall be included in
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+# all copies or substantial portions of the Software.
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+#
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+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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+# IN THE SOFTWARE.
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+#
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+
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+require 'digest/md5'
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+require 'json'
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+require 'fileutils'
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+
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+VERSION = "1.0.2"
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+
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+VERSION_TEXT = "mtime_cache v#{VERSION}"
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+
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+USAGE = <<ENDUSAGE
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+
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+Usage:
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+ mtime_cache [<globs>] [-g globfile] [-d] [-q|V] [-c cache]
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+ENDUSAGE
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+
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+HELP = <<ENDHELP
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+
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+ Traverse through globbed files, making a json cache based on their mtime.
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+ If a cache exists, changes the mtime of existing unchanged (based on MD5
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+ hash) files to the one in the cache.
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+
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+ Options:
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+
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+ globs Ruby-compatible glob strings (ex some/path/**/*.java)
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+ A extension pattern is allowd in the form %{pattern}
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+ (ex some/path/*.{%{pattern1},%{pattern2}})
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+ The globs support the following patterns:
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+ %{cpp} - common C++ extensions
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+
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+ -g, --globfile A file with list of globs to perform (one per line)
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+
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+ -?, -h, --help Show this help message.
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+ -v, --version Show the version number (#{VERSION})
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+ -q, --quiet Don't log anything to stdout
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+ -V, --verbose Show extra logging
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+ -d, --dryrun Don't change any files on the filesystem
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+ -c, --cache Specify the cache file for input and output.
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+ [Default is .mtime_cache.json]
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+
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+ENDHELP
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+
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+param_arg = nil
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+ARGS = { :cache => '.mtime_cache.json', :globs => [] }
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+
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+ARGV.each do |arg|
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+ case arg
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+ when '-g', '--globfile' then param_arg = :globfile
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+ when '-h', '-?', '--help' then ARGS[:help] = true
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+ when '-v', '--version' then ARGS[:ver] = true
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+ when '-q', '--quiet' then ARGS[:quiet] = true
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+ when '-V', '--verbose' then ARGS[:verbose] = true
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+ when '-d', '--dryrun' then ARGS[:dry] = true
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+ when '-c', '--cache' then param_arg = :cache
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+ else
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+ if param_arg
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+ ARGS[param_arg] = arg
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+ param_arg = nil
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+ else
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+ ARGS[:globs] << arg
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+ end
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+ end
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+end
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+
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+def log(text, level = 0)
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+ return if ARGS[:quiet]
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+ return if level > 0 && !ARGS[:verbose]
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+ puts text
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+end
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+
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+if ARGS[:ver] || ARGS[:help]
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+ log VERSION_TEXT
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+ exit if ARGS[:ver]
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+ log USAGE
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+ log HELP
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+ exit
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+end
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+
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+if ARGS[:globs].empty? && !ARGS[:globfile]
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+ log 'Error: Missing globs'
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+ log USAGE
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+ exit 1
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+end
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+
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+EXTENSION_PATTERNS = {
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+ :cpp => "c,cc,cpp,cxx,h,hpp,hxx,inl,ipp,inc,ixx"
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+}
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+
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+cache_file = ARGS[:cache]
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+
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+cache = {}
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+
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+if File.file?(cache_file)
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+ log "Found #{cache_file}"
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+ cache = JSON.parse(File.read(cache_file))
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+ log "Read #{cache.length} entries"
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+else
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+ log "#{cache_file} not found. A new one will be created"
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+end
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+
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+globs = ARGS[:globs].map { |g| g % EXTENSION_PATTERNS }
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+
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+globfile = ARGS[:globfile]
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+if globfile
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+ File.open(globfile, 'r').each_line do |line|
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+ line.strip!
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+ next if line.empty?
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+ globs << line % EXTENSION_PATTERNS
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+ end
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+end
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+
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+if globs.empty?
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+ log 'Error: No globs in globfile'
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+ log USAGE
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+ exit 1
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+end
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+
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+files = {}
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+num_changed = 0
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+
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+globs.each do |glob|
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+ Dir[glob].each do |file|
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+ next if !File.file?(file)
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+
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+ mtime = File.mtime(file).to_i
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+ hash = Digest::MD5.hexdigest(File.read(file))
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+
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+ cached = cache[file]
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+
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+ if cached && cached['hash'] == hash && cached['mtime'] < mtime
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+ mtime = cached['mtime']
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+
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+ log "mtime_cache: changing mtime of #{file} to #{mtime}", 1
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+
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+ File.utime(File.atime(file), Time.at(mtime), file) if !ARGS[:dry]
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+ num_changed += 1
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+ else
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+ log "mtime_cache: NOT changing mtime of #{file}", 1
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+ end
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+
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+ files[file] = { 'mtime' => mtime, 'hash' => hash }
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+ end
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+end
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+
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+log "Changed mtime of #{num_changed} of #{files.length} files"
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+log "Writing #{cache_file}"
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+
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+if !ARGS[:dry]
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+ dirname = File.dirname(cache_file)
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+ unless File.directory?(dirname)
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+ FileUtils.mkdir_p(dirname)
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+ end
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+ File.open(cache_file, 'w').write(JSON.pretty_generate(files))
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+end
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Jared Mulconry