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/usr/lib/ruby/1.8/vim/addon-manager.rb is in vim-addon-manager 0.4.4.

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# vim-addons: command line manager of Vim addons
#
# Copyright (C) 2007 Stefano Zacchiroli
#
# 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 3 of the License, or
# (at your option) any later version.
#
# $Id: addon-manager.rb 866 2007-01-24 21:27:58Z zack $

require 'fileutils'

require 'vim/common'
require 'vim/constants'

module Vim

  class AddonManager

    def initialize(source_dir, target_dir)
      @source_dir = source_dir
      @target_dir = target_dir
    end

    attr_accessor :source_dir
    attr_accessor :target_dir

    def install(addons)
      installed_files = []
      addons.each do |addon|
	base_dir = (addon.basedir or @source_dir)
	symlink = lambda do |file|
	  dest = File.join(@target_dir, file)
	  dest_dir = File.dirname dest
	  FileUtils.mkdir_p dest_dir
	  FileUtils.ln_sf(File.join(base_dir, file), dest)
	end
	status = addon.status(@target_dir)
	case status.status
	when :broken
	  Vim.info "installing broken addon '#{addon}' to #{@target_dir}"
	  status.missing_files.each(&symlink)
	  installed_files.concat(status.missing_files.to_a)
	when :not_installed
	  Vim.info "installing removed addon '#{addon}' to #{@target_dir}"
	  addon.files.each(&symlink)
	  installed_files.concat(addon.files.to_a)
	when :unavailable
	  s = "ignoring '#{addon}' which is missing source files"
	  s << "\n- #{status.missing_files.join "\n- "}" if Vim.verbose?
	  Vim.warn s
	else
	  Vim.info "ignoring '#{addon}' which is neither removed nor broken"
	end
      end
      rebuild_tags(installed_files)
    end

    def remove(addons)
      removed_files = []
      rmdirs = lambda do |file|
	File.delete(File.join(@target_dir, file))
	dir = File.dirname(file)
	paths = (dir.include? File::Separator) ? File.split(dir) : [dir]
	while paths.size > 0
	  begin
	    FileUtils.rmdir(File.join(@target_dir, paths))
	  rescue Errno::ENOTEMPTY
	    break
	  end
	  paths.pop
	end
      end
      addons.each do |addon|
	status = addon.status(@target_dir)
	case status.status
	when :installed
	  Vim.info "removing installed addon '#{addon}' from #{@target_dir}"
	  addon.files.each(&rmdirs)
	  removed_files.concat(addon.files.to_a)
	when :broken
	  Vim.info "removing broken addon '#{addon}' from #{@target_dir}"
	  files = (addon.files - status.missing_files)
	  files.each(&rmdirs)
	  removed_files.concat(files.to_a)
	else
	  Vim.info "ignoring '#{addon}' which is neither installed nor broken"
	end
      end
      # Try to clean up the tags file and doc dir if it's empty
      tagfile = File.join(@target_dir, 'doc', 'tags')
      if File.exists? tagfile
	File.unlink tagfile
	begin
	  FileUtils.rmdir File.join(@target_dir, 'doc')
	rescue Errno::ENOTEMPTY
	  rebuild_tags(removed_files)
	end
      end
    end

    def disable(addons)
      map_override_lines do |lines|
        addons.each do |addon|  # disable each not yet disabled addon
          if not addon.disabled_by_line
            Vim.warn \
              "#{addon} can't be disabled (since it has no 'disabledby' field)"
            next
          end
          if lines.any? {|line| addon.is_disabled_by? line}
	    Vim.info "ignoring addon '#{addon}' which is already disabled"
	  else
	    Vim.info "disabling enabled addon '#{addon}'"
            lines << addon.disabled_by_line + "\n"
          end
        end
      end
    end

    def enable(addons)
      map_override_lines do |lines|
        addons.each do |addon|
          if not addon.disabled_by_line
            Vim.warn \
              "#{addon} can't be enabled (since it has no disabledby field)"
            next
          end
	  if lines.any? {|line| addon.is_disabled_by? line}
	    Vim.info "enabling disabled addon '#{addon}'"
	    lines.reject! {|line| addon.is_disabled_by? line}
	  else
	    Vim.info "ignoring addon '#{addon}' which is enabled"
	  end
        end
      end
    end

    def amend(addons)
      Vim.warn "the 'amend' command is deprecated and will disappear in a " +
               "future release.  Please use the 'enable' command instead."
      enable(addons)
    end

    def show(addons)
      addons.each do |addon|
        puts "Addon: #{addon}"
        puts "Status: #{addon.status(@target_dir)}"
        puts "Description: #{addon.description}"
        puts ""
      end
    end

    private

    def map_override_lines
      override_lines = []
      override_file = Vim.override_file @target_dir
      if File.exist? override_file
        File.open(override_file) do |file|
          override_lines += file.to_a
        end
      end
      checksum = override_lines.hash

      yield override_lines

      if override_lines.empty?
        FileUtils.rm override_file if File.exist? override_file
      elsif override_lines.hash != checksum
        File.open(override_file, 'w') do |file|
          file.write override_lines
        end
      end
    end

    def rebuild_tags(files)
      needs_rebuilding = files.any? {|file| file =~ /^doc\//}
      if needs_rebuilding
        Vim.info 'Rebuilding tags since documentation has been modified ...'
        Vim.system "#{HELPZTAGS} #{File.join(@target_dir, 'doc/')}"
        Vim.info 'done.'
      end
    end

  end

end