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#
# Author:: Nuo Yan (<nuo@chef.io>)
# Copyright:: Copyright 2009-2016, Chef Software Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
require "chef/util/editor"
require "fileutils"
class Chef
class Util
class FileEdit
private
attr_reader :editor, :original_pathname
public
def initialize(filepath)
raise ArgumentError, "File '#{filepath}' does not exist" unless File.exist?(filepath)
@editor = Editor.new(File.open(filepath, &:readlines))
@original_pathname = filepath
@file_edited = false
end
# return if file has been edited
def file_edited?
@file_edited
end
#search the file line by line and match each line with the given regex
#if matched, replace the whole line with newline.
def search_file_replace_line(regex, newline)
@changes = (editor.replace_lines(regex, newline) > 0) || @changes
end
#search the file line by line and match each line with the given regex
#if matched, replace the match (all occurrences) with the replace parameter
def search_file_replace(regex, replace)
@changes = (editor.replace(regex, replace) > 0) || @changes
end
#search the file line by line and match each line with the given regex
#if matched, delete the line
def search_file_delete_line(regex)
@changes = (editor.remove_lines(regex) > 0) || @changes
end
#search the file line by line and match each line with the given regex
#if matched, delete the match (all occurrences) from the line
def search_file_delete(regex)
search_file_replace(regex, "")
end
#search the file line by line and match each line with the given regex
#if matched, insert newline after each matching line
def insert_line_after_match(regex, newline)
@changes = (editor.append_line_after(regex, newline) > 0) || @changes
end
#search the file line by line and match each line with the given regex
#if not matched, insert newline at the end of the file
def insert_line_if_no_match(regex, newline)
@changes = (editor.append_line_if_missing(regex, newline) > 0) || @changes
end
def unwritten_changes?
!!@changes
end
#Make a copy of old_file and write new file out (only if file changed)
def write_file
if @changes
backup_pathname = original_pathname + ".old"
FileUtils.cp(original_pathname, backup_pathname, :preserve => true)
File.open(original_pathname, "w") do |newfile|
editor.lines.each do |line|
newfile.puts(line)
end
newfile.flush
end
@file_edited = true
end
@changes = false
end
end
end
end
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