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