From 76c10dada86fd807d36ccafca393e945e381696a Mon Sep 17 00:00:00 2001 From: Eric Wong Date: Sat, 12 Nov 2016 02:13:42 +0000 Subject: initial --- .gitignore | 6 + COPYING | 339 ++++++++++++++++++++++++++++++++++++++++++++++++ GNUmakefile | 45 +++++++ README | 81 ++++++++++++ lib/msgthr.rb | 91 +++++++++++++ lib/msgthr/container.rb | 73 +++++++++++ msgthr.gemspec | 17 +++ test/test_msgthr.rb | 20 +++ 8 files changed, 672 insertions(+) create mode 100644 .gitignore create mode 100644 COPYING create mode 100644 GNUmakefile create mode 100644 README create mode 100644 lib/msgthr.rb create mode 100644 lib/msgthr/container.rb create mode 100644 msgthr.gemspec create mode 100644 test/test_msgthr.rb diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..b338ecb --- /dev/null +++ b/.gitignore @@ -0,0 +1,6 @@ +# Copyright (C) 2016 all contributors +# License: GPL-3.0+ +*.gem +*.gz +.manifest +pkg/ diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..d159169 --- /dev/null +++ b/COPYING @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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It is safest +to attach them to the start of each source file to most effectively +convey the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License along + with this program; if not, write to the Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) year name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/GNUmakefile b/GNUmakefile new file mode 100644 index 0000000..49ab677 --- /dev/null +++ b/GNUmakefile @@ -0,0 +1,45 @@ +# Copyright (C) 2016 all contributors +# License: GPL-2.0+ +all:: +pkg = msgthr +RUBY = ruby +lib := lib +VERSION := 0.0.0 + +all:: test +test_units := $(wildcard test/test_*.rb) +test: $(test_units) +$(test_units): + $(RUBY) -w -I $(lib) $@ -v + +check-warnings: + @(for i in $$(git ls-files '*.rb'| grep -v '^setup\.rb$$'); \ + do $(RUBY) -d -W2 -c $$i; done) | grep -v '^Syntax OK$$' || : + +check: test + +pkggem := pkg/$(pkg)-$(VERSION).gem + +fix-perms: + git ls-tree -r HEAD | awk '/^100644 / {print $$NF}' | xargs chmod 644 + +gem: $(pkggem) + +install-gem: $(pkggem) + gem install --local $(CURDIR)/$< + +$(pkggem): .manifest + VERSION=$(VERSION) gem build $(pkg).gemspec + mkdir -p pkg + mv $(@F) $@ + +pkg_extra := + +.manifest: fix-perms + git ls-files | LC_ALL=C sort >$@+ + cmp $@+ $@ || mv $@+ $@; rm -f $@+ + +package: $(pkggem) + +.PHONY: all test $(test_units) +.PHONY: check-warnings fix-perms diff --git a/README b/README new file mode 100644 index 0000000..ca7c24c --- /dev/null +++ b/README @@ -0,0 +1,81 @@ +msgthr - non-recursive, container-agnostic message threading +------------------------------------------------------------ + +Message threading based on the algorithm described by JWZ in + and used in +countless mail and news readers; but with some features +removed and improved flexibility: + +* No pruning of non-leaf ghosts. Readers are not shielded + from deleted or lost messages. Equivalent to setting + "hide_missing" to "no" in mutt. + +* No grouping by subject. This makes things ideal for short + messages such as chat and status updates. For email, this + encourages the use of proper client which set In-Reply-To + or References headers. Equivalent to setting + "strict_threads" to "yes" in mutt. + +* No recursion; all algorithms are non-recursive to avoid + SystemStackError exceptions in deep threads. + Memory usage is bound by the number of lightweight containers + needed to represent a thread. + +* Message format-agnostic, not limited to email or NNTP; + but even appropriate for forums, blog comments, IM, etc. + For mail and NNTP messages, that means you must extract + the Message-ID and parse the References and In-Reply-To + headers into an array yourself. + +Source code +----------- + + git clone git://80x24.org/msgthr + +Contact +------- + +Feedback is welcome via plain-text mail (no HTML, images, etc). +Please send comments, user/dev discussion, patches, bug reports, +and pull requests to the open-to-all mailing list at: + + msgthr-public@80x24.org + +No subscription will ever be required to post. Please Cc: all +recipients as subscription is not necessary. + +Mailing list archives via HTTPS: https://80x24.org/msgthr-public/ +Or NNTP: nntp://news.public-inbox.org/inbox.comp.lang.ruby.msgthr + +You may optionally subscribe, but will never be required to: + + msgthr-public+subscribe@80x24.org + +This README is our homepage, we would rather be working on cool +stuff day than worrying about the next browser vulnerability +because HTML/CSS/JS/images are too complicated for us. + +* https://80x24.org/msgthr/README + +Copyright +--------- + +Copyright 2016, all contributors (see git repo). +License: GPL-2.0+ + +msgthr is copyrighted Free Software by all contributors, see logs in +revision control for names and email addresses of all of them. + +msgthr is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as +published by the Free Software Foundation; either version 2 of +the License, or (at your option) any later version. + +msgthr is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public +License along with this program; if not, see +https://www.gnu.org/licenses/gpl-2.0.txt diff --git a/lib/msgthr.rb b/lib/msgthr.rb new file mode 100644 index 0000000..f8b5896 --- /dev/null +++ b/lib/msgthr.rb @@ -0,0 +1,91 @@ +# Copyright (C) 2016 all contributors +# License: GPL-2.0+ + +# Non-recursive, container-agnostic message threading. +class Msgthr + + # an Array of root (parent-less) messages, only populated after + # calling Msgthr#thread! + attr_reader :rootset + + # Initialize a Msgthr object + def initialize + @id_table = {} + @rootset = [] + end + + # Clear internal data structures to save memory and prepare for reuse + def clear + @rootset.clear + @id_table.clear + end + + # Threads the message + # This does not sort + def thread! + ret = @rootset + @id_table.each_value { |cont| ret << cont if cont.parent.nil? }.clear + ret + end + + def order! + yield @rootset + @rootset.each { |cont| cont.order! { |children| yield(children) } } + end + + # non-recursively walk a thread + def walk_thread + i = -1 + q = @rootset.map { |cont| [ 0, cont, i += 1 ] } + while tmp = q.shift + level, cont, idx = tmp + yield(level, cont, idx) + level += 1 + i = -1 + q = cont.children.map { |cld| [ level, cld, i += 1 ] }.concat(q) + end + end + + # Adds a message to prepare a Msgthr object for threading. + # + # * +mid+ is a unique identifier for the message in a given thread. + # + # * +refs+ should be an Array of unique identifiers. For mail and + # news messages, this is usually the parsed result of the + # "References:" header. Order should be oldest to newest + # in terms of ancestry, with the last element being the + # immediate parent of the given message. + # + # This is +nil+ for messages with no parent. + # + # * +msg+ is an opaque object which typically contains a + # Mail or Tmail object for handling mail. + # + # If +mid+ is a String, it is recommended to freeze the string before + # calling this method to avoid wasting memory on hash keys. + def add(mid, refs, msg) + cur = @id_table[mid] ||= Msgthr::Container.new(mid) + cur.msg = msg + refs or return + + # n.b. centralized messaging systems (e.g. forums) do not need + # multiple References:, only decentralized systems need it to + # tolerate missing messages + prev = nil + refs.each do |ref| + cont = @id_table[ref] ||= Msgthr::Container.new(ref) + + # link refs together in order implied, + # but do not change existing links or loop + if prev && !cont.parent && !cont.has_descendent(prev) + prev.add_child(cont) + end + prev = cont + end + + # set parent of this message to be the last element in refs + prev.add_child(cur) if prev + end +end + +require_relative 'msgthr/container' diff --git a/lib/msgthr/container.rb b/lib/msgthr/container.rb new file mode 100644 index 0000000..30f6775 --- /dev/null +++ b/lib/msgthr/container.rb @@ -0,0 +1,73 @@ +# Copyright (C) 2016 all contributors +# License: GPL-2.0+ + +# An internal container class, this is exposed for sorting APIs +# but should not be initialized in your own code. +class Msgthr::Container + + # Unique message identifier, typically the Message-Id header for mail + # and news messages. This may be any hashable object, Integer values + # are allowed and will not be coerced to string values. + attr_reader :mid + + # Opaque data pointer, may be used by the user for any purpose. + # This may be +nil+ to denote missing (aka "ghost") messages. + attr_accessor :msg + + attr_accessor :children # :nodoc: + attr_accessor :parent # :nodoc: + + def initialize(mid) # :nodoc: + @mid = mid + @children = {} # becomes an Array after order! + @parent = nil + @msg = nil # opaque + end + + # returns the topmost message container with an opaque message pointer + # in it. This may be +nil+ if none are available. + def topmost + q = [ self ] + while cont = q.shift + return cont if cont.msg + q.concat(cont.children.values) + end + nil + end + + def add_child(child) # :nodoc: + raise 'cannot become child of self' if child == self + cid = child.mid + + # reparenting: + parent = child.parent and parent.children.delete(cid) + + @children[cid] = child + child.parent = self + end + + def has_descendent(child) # :nodoc: + seen = Hash.new(0) + while child + return true if self == child || (seen[child] += 1) != 0 + child = child.parent + end + false + end + + def order! # :nodoc: + seen = { @mid => true } + q = [ self ] + while cur = q.shift + c = [] + cur.children.each do |cmid, cont| + next if seen[cmid] + c << cont + seen[cmid] = true + end.clear + yield(c) if c.size > 1 + cur.children = c + q.concat(c) + end + end +end diff --git a/msgthr.gemspec b/msgthr.gemspec new file mode 100644 index 0000000..0bb591e --- /dev/null +++ b/msgthr.gemspec @@ -0,0 +1,17 @@ +# Copyright (C) 2016 all contributors +# License: GPL-2.0+ + +Gem::Specification.new do |s| + manifest = File.read('.manifest').split(/\n/) + s.name = %q{msgthr} + s.version = ENV['VERSION'] || '0.0.0' + s.authors = ['msgthr hackers'] + s.summary = 'non-recursive, container-agnostic message threading' + s.description = File.read('README').split(/\n\n/)[1].strip + s.email = %q{msgthr-public@80x24.org} + s.homepage = 'https://80x24.org/msgthr/' + s.executables = [] + s.files = manifest + s.licenses = 'GPL-2.0+' + s.required_ruby_version = '>= 1.9.3' +end diff --git a/test/test_msgthr.rb b/test/test_msgthr.rb new file mode 100644 index 0000000..2e398c1 --- /dev/null +++ b/test/test_msgthr.rb @@ -0,0 +1,20 @@ +# Copyright (C) 2016 all contributors +# License: GPL-2.0+ +require 'test/unit' +require 'msgthr' + +class TestMsgthr < Test::Unit::TestCase + def test_msgthr + thr = Msgthr.new + thr.add('a', %w(c b), 'abc') + thr.add('b', %w(c), 'B') + thr.add('c', nil, 'c') + thr.add('D', nil, 'D') + thr.add('d', nil, 'd') + thr.thread! + rootset = thr.order! { |c| c.sort! { |a, b| a.mid <=> b.mid } } + assert_equal %w(D c d), rootset.map(&:mid) + assert_equal 'D', rootset[0].msg + assert_equal %w(b), rootset[1].children.map(&:mid) + end +end -- cgit v1.2.3-24-ge0c7