From fbf59bdbea63efd34ccc144e648467d2f52e7345 Mon Sep 17 00:00:00 2001
From: drbrain <drbrain@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 10 Nov 2007 07:48:56 +0000
Subject: Import RubyGems trunk revision 1493.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@13862 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 lib/rubygems/uninstaller.rb | 183 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 183 insertions(+)
 create mode 100644 lib/rubygems/uninstaller.rb

(limited to 'lib/rubygems/uninstaller.rb')

diff --git a/lib/rubygems/uninstaller.rb b/lib/rubygems/uninstaller.rb
new file mode 100644
index 0000000000..0f7edb048c
--- /dev/null
+++ b/lib/rubygems/uninstaller.rb
@@ -0,0 +1,183 @@
+#--
+# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
+# All rights reserved.
+# See LICENSE.txt for permissions.
+#++
+
+require 'fileutils'
+require 'rubygems'
+require 'rubygems/dependency_list'
+require 'rubygems/doc_manager'
+require 'rubygems/user_interaction'
+
+##
+# An Uninstaller.
+#
+class Gem::Uninstaller
+
+  include Gem::UserInteraction
+
+  ##
+  # Constructs an Uninstaller instance
+  #
+  # gem:: [String] The Gem name to uninstall
+  #
+  def initialize(gem, options)
+    @gem = gem
+    @version = options[:version] || Gem::Requirement.default
+    @force_executables = options[:executables]
+    @force_all = options[:all]
+    @force_ignore = options[:ignore]
+  end
+
+  ##
+  # Performs the uninstall of the Gem.  This removes the spec, the
+  # Gem directory, and the cached .gem file,
+  #
+  def uninstall
+    list = Gem.source_index.search(/^#{@gem}$/, @version)
+
+    if list.empty? then
+      raise Gem::InstallError, "Unknown gem #{@gem}-#{@version}"
+    elsif list.size > 1 && @force_all
+      remove_all(list.dup) 
+      remove_executables(list.last)
+    elsif list.size > 1 
+      say 
+      gem_names = list.collect {|gem| gem.full_name} + ["All versions"]
+      gem_name, index =
+        choose_from_list("Select gem to uninstall:", gem_names)
+      if index == list.size
+        remove_all(list.dup) 
+        remove_executables(list.last)
+      elsif index >= 0 && index < list.size
+        to_remove = list[index]
+        remove(to_remove, list)
+        remove_executables(to_remove)
+      else
+        say "Error: must enter a number [1-#{list.size+1}]"
+      end
+    else
+      remove(list[0], list.dup)
+      remove_executables(list.last)
+    end
+  end
+  
+  ##
+  # Remove executables and batch files (windows only) for the gem as
+  # it is being installed
+  #
+  # gemspec::[Specification] the gem whose executables need to be removed.
+  #
+  def remove_executables(gemspec)
+    return if gemspec.nil?
+    if(gemspec.executables.size > 0)
+      raise Gem::FilePermissionError.new(Gem.bindir) unless
+        File.writable?(Gem.bindir)
+      list = Gem.source_index.search(gemspec.name).delete_if { |spec|
+        spec.version == gemspec.version
+      }
+      executables = gemspec.executables.clone
+      list.each do |spec|
+        spec.executables.each do |exe_name|
+          executables.delete(exe_name)
+        end
+      end
+      return if executables.size == 0
+      answer = @force_executables || ask_yes_no(
+        "Remove executables and scripts for\n" +
+        "'#{gemspec.executables.join(", ")}' in addition to the gem?",
+        true) # " # appease ruby-mode - don't ask
+      unless answer
+        say "Executables and scripts will remain installed."
+        return
+      else
+        gemspec.executables.each do |exe_name|
+          say "Removing #{exe_name}"
+          File.unlink File.join(Gem.bindir, exe_name) rescue nil
+          File.unlink File.join(Gem.bindir, exe_name + ".bat") rescue nil
+        end
+      end
+    end
+  end
+  
+  #
+  # list:: the list of all gems to remove
+  #
+  # Warning: this method modifies the +list+ parameter.  Once it has
+  # uninstalled a gem, it is removed from that list.
+  #
+  def remove_all(list)
+    list.dup.each { |gem| remove(gem, list) }
+  end
+
+  #
+  # spec:: the spec of the gem to be uninstalled
+  # list:: the list of all such gems
+  #
+  # Warning: this method modifies the +list+ parameter.  Once it has
+  # uninstalled a gem, it is removed from that list.
+  #
+  def remove(spec, list)
+    unless ok_to_remove? spec then
+      raise Gem::DependencyRemovalException,
+            "Uninstallation aborted due to dependent gem(s)"
+    end
+
+    raise Gem::FilePermissionError, spec.installation_path unless
+      File.writable?(spec.installation_path)
+
+    FileUtils.rm_rf spec.full_gem_path
+
+    original_platform_name = [
+      spec.name, spec.version, spec.original_platform].join '-'
+
+    spec_dir = File.join spec.installation_path, 'specifications'
+    gemspec = File.join spec_dir, "#{spec.full_name}.gemspec"
+
+    unless File.exist? gemspec then
+      gemspec = File.join spec_dir, "#{original_platform_name}.gemspec"
+    end
+
+    FileUtils.rm_rf gemspec
+
+    cache_dir = File.join spec.installation_path, 'cache'
+    gem = File.join cache_dir, "#{spec.full_name}.gem"
+
+    unless File.exist? gemspec then
+      gem = File.join cache_dir, "#{original_platform_name}.gem"
+    end
+
+    FileUtils.rm_rf gem
+
+    Gem::DocManager.new(spec).uninstall_doc
+
+    say "Successfully uninstalled #{spec.full_name}"
+
+    list.delete spec
+  end
+
+  def ok_to_remove?(spec)
+    return true if @force_ignore
+
+    srcindex = Gem::SourceIndex.from_installed_gems
+    deplist = Gem::DependencyList.from_source_index srcindex
+    deplist.ok_to_remove?(spec.full_name) || ask_if_ok(spec)
+  end
+
+  def ask_if_ok(spec)
+    msg = ['']
+    msg << 'You have requested to uninstall the gem:'
+    msg << "\t#{spec.full_name}"
+    spec.dependent_gems.each do |gem,dep,satlist|
+      msg <<
+        ("#{gem.name}-#{gem.version} depends on " +
+        "[#{dep.name} (#{dep.version_requirements})]")
+    end
+    msg << 'If you remove this gems, one or more dependencies will not be met.'
+    msg << 'Continue with Uninstall?'
+    return ask_yes_no(msg.join("\n"), true)
+  end
+
+end
+
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