Merge pull request #3 from jdee/text-files

Add text_file attr for loading text from external files

Author: jdee

README.md

@@ -62,3 +62,30 @@ Load a patch defined in YAML and apply it.
 ```Ruby
 PatternPatch::Patch.from_yaml("patch.yaml").apply "file.txt"
 ```
+
+#### Define patch text in external files
+
+Load the contents of a file to use for the insertion/substitution text:
+
+```Ruby
+PatternPatch::Patch.new(
+  regexp: /\z/,
+  text_file: "text_to_insert_at_end.txt",
+  mode: :append
+)
+```
+
+When loading from a YAML file, the `text_file` path is interpreted relative
+to the directory of the YAML file, e.g.:
+
+**patch.yaml:**
+
+```YAML
+text_file: text_to_insert_at_end.txt
+```
+
+```Ruby
+PatternPatch::Patch.from_yaml("/path/to/patches/patch.yaml")
+```
+
+This will load the contents of `/path/to/patches/text_to_insert_at_end.txt`.

lib/pattern_patch/patch.rb

@@ -7,6 +7,7 @@ class Patch
     attr_accessor :text
     attr_accessor :mode
     attr_accessor :global
+    attr_reader :text_file
 
     class << self
       def from_yaml(path)
@@ -22,17 +23,35 @@ def from_yaml(path)
           hash[:mode] = hash[:mode].to_sym
         end
 
+        if hash[:text_file]
+          hash[:text_file] = File.expand_path hash[:text_file], File.dirname(path)
+        end
+
         new hash
       end
     end
 
     def initialize(options = {})
+      raise ArgumentError, "text and text_file are mutually exclusive" if options[:text] && options[:text_file]
+
       @regexp = options[:regexp]
-      @text = options[:text]
+      @text_file = options[:text_file]
+
+      if @text_file
+        @text = File.read @text_file
+      else
+        @text = options[:text]
+      end
+
       @mode = options[:mode] || :append
       @global = options[:global].nil? ? false : options[:global]
     end
 
+    def text_file=(path)
+      @text_file = path
+      @text = File.read path if path
+    end
+
     def apply(files, options = {})
       offset = options[:offset] || 0
       files = [files] if files.kind_of? String

lib/pattern_patch/version.rb

@@ -1,3 +1,3 @@
 module PatternPatch
-  VERSION = "0.2.1"
+  VERSION = "0.3.0"
 end