From 8da8f6a33def410147a5f3eb4f3beb91c4d1faa4 Mon Sep 17 00:00:00 2001
From: Darren Pearce <limeyd@gmail.com>
Date: Tue, 23 Aug 2011 10:07:23 -0600
Subject: [PATCH] added optional support for watching deletions and with that
 comes file moves

---
 bin/guard             |  2 +-
 lib/guard.rb          | 23 +++++++++++++++++++----
 lib/guard/cli.rb      |  1 +
 lib/guard/guard.rb    |  4 ++++
 lib/guard/listener.rb | 23 +++++++++++++++++------
 5 files changed, 42 insertions(+), 11 deletions(-)

diff --git a/bin/guard b/bin/guard
index d30b664..ff51a7d 100755
--- a/bin/guard
+++ b/bin/guard
@@ -3,4 +3,4 @@
 require 'guard'
 require 'guard/cli'
 
-Guard::CLI.start
\ No newline at end of file
+Guard::CLI.start
diff --git a/lib/guard.rb b/lib/guard.rb
index 701d428..4aea6e9 100644
--- a/lib/guard.rb
+++ b/lib/guard.rb
@@ -14,10 +14,11 @@ module Guard
     # initialize this singleton
     def setup(options = {})
       @options  = options
-      @listener = Listener.select_and_init(@options[:watchdir] ? File.expand_path(@options[:watchdir]) : Dir.pwd)
+      @listener = Listener.select_and_init(@options[:watchdir] ? File.expand_path(@options[:watchdir]) : Dir.pwd,options)
       @groups   = [:default]
       @guards   = []
 
+      @watch_deletions = options[:deletions]
       @options[:notify] && ENV["GUARD_NOTIFY"] != 'false' ? Notifier.turn_on : Notifier.turn_off
 
       UI.clear if @options[:clear]
@@ -46,10 +47,24 @@ module Guard
 
     def run_on_change_for_all_guards(files)
       guards.each do |guard|
+        #UI.debug "files: #{files.inspect}"
         paths = Watcher.match_files(guard, files)
-        unless paths.empty?
-          UI.debug "#{guard.class.name}#run_on_change with #{paths.inspect}"
-          supervised_task(guard, :run_on_change, paths)
+        if @watch_deletions
+          unless paths.empty?
+            UI.debug "#{guard.class.name}#run_on_change with #{paths.inspect}"
+            supervised_task(guard, :run_on_change, paths.select {|f| !f.start_with?('!') })
+            deletions = paths.collect { |f| f.slice(1..-1) if f.start_with?('!') }.compact
+          end
+
+          unless deletions.empty?
+            UI.debug "#{guard.class.name}#run_on_deletion with #{deletions.inspect}"
+            supervised_task(guard, :run_on_deletion, deletions)
+          end
+        else
+          unless paths.empty?
+            UI.debug "#{guard.class.name}#run_on_change with #{paths.inspect}"
+            supervised_task(guard, :run_on_change, paths)
+          end
         end
       end
 
diff --git a/lib/guard/cli.rb b/lib/guard/cli.rb
index dc539f0..f189b63 100644
--- a/lib/guard/cli.rb
+++ b/lib/guard/cli.rb
@@ -11,6 +11,7 @@ module Guard
     method_option :group,     :type => :array,   :default => [],    :aliases => '-g', :banner => "Run only the passed groups"
     method_option :watchdir,  :type => :string,                     :aliases => '-w', :banner => "Specify the directory to watch"
     method_option :guardfile, :type => :string,                     :aliases => '-G', :banner => "Specify a Guardfile"
+    method_option :deletions, :type => :boolean, :default => false, :aliases => '-D', :banner => "Watch for deleted files"
 
     desc "start", "Starts Guard"
     def start
diff --git a/lib/guard/guard.rb b/lib/guard/guard.rb
index aed9bc9..a316d51 100644
--- a/lib/guard/guard.rb
+++ b/lib/guard/guard.rb
@@ -53,5 +53,9 @@ module Guard
       true
     end
 
+    def run_on_deletion(paths)
+      true
+    end
+
   end
 end
diff --git a/lib/guard/listener.rb b/lib/guard/listener.rb
index b3bf224..e9f5a46 100644
--- a/lib/guard/listener.rb
+++ b/lib/guard/listener.rb
@@ -29,12 +29,14 @@ module Guard
       @directory           = directory.to_s
       @sha1_checksums_hash = {}
       @relativize_paths    = options.fetch(:relativize_paths, true)
-      @cached_files = all_files
+      @watch_deletions = options.deletions
       update_last_event
     end
 
     def start
       watch(@directory)
+      # populate initial sha1 hash to watch for deleted or moved files
+      all_files.each {|path| set_sha1_checksums_hash(path, sha1_checksum(path))} if @watch_deletions
     end
 
     def stop
@@ -49,10 +51,17 @@ module Guard
     end
 
     def modified_files(dirs, options={})
-      files = potentially_modified_files(dirs, options).select { |path| file_modified?(path) }
-      deleted_files = @cached_files.collect { |path| "!#{path}" unless File.exists?(path) }.compact
-      files.concat(deleted_files)
-      @cached_files = all_files
+      files = []
+      if @watch_deletions
+        deleted_files = @sha1_checksums_hash.collect do |path, sha1|
+          unless File.exists?(path)
+            @sha1_checksums_hash.delete(path)
+            "!#{path}"
+          end
+        end
+        files.concat(deleted_files.compact)
+      end
+      files.concat(potentially_modified_files(dirs, options).select { |path| file_modified?(path) })
       update_last_event
       relativize_paths(files)
     end
@@ -74,7 +83,7 @@ module Guard
     def relativize_paths(paths)
       return paths unless relativize_paths?
       paths.map do |path|
-        path.gsub(%r{^#{@directory}/}, '')
+        path.gsub(%r{#{@directory}/}, '')
       end
     end
 
@@ -111,6 +120,8 @@ module Guard
       elsif File.mtime(path).to_i > @last_event.to_i
         set_sha1_checksums_hash(path, sha1_checksum(path))
         true
+      elsif @watch_deletions
+        file_content_modified?(path, sha1_checksum(path))
       end
     rescue
       false