From 07e5f8d4402346ccb336cc0680cad98d0d5ba920 Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Fri, 14 Feb 2025 21:08:34 +0200
Subject: add ensure_line

---
 Gemfile                 |  3 ++-
 Gemfile.lock            |  4 ++++
 Rakefile                | 13 +++++++++++--
 lib/dsl.rb              |  1 +
 lib/dslkeywords/file.rb | 27 +++++++++++++++++++++------
 5 files changed, 39 insertions(+), 9 deletions(-)

diff --git a/Gemfile b/Gemfile
index 6bc7a34..728602d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,5 @@
 source 'https://rubygems.org'
 
-gem 'toml'
 gem 'erb'
+gem 'rbs'
+gem 'toml'
diff --git a/Gemfile.lock b/Gemfile.lock
index fe13324..0fcb5fb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -4,7 +4,10 @@ GEM
     cgi (0.4.1)
     erb (4.0.4)
       cgi (>= 0.3.3)
+    logger (1.6.4)
     parslet (2.0.0)
+    rbs (3.7.0)
+      logger
     toml (0.3.0)
       parslet (>= 1.8.0, < 3.0.0)
 
@@ -14,6 +17,7 @@ PLATFORMS
 
 DEPENDENCIES
   erb
+  rbs
   toml
 
 BUNDLED WITH
diff --git a/Rakefile b/Rakefile
index d883dac..99a599f 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,4 +1,4 @@
-require_relative 'lib/dsl'.frozen
+require_relative 'lib/dsl'
 
 desc 'Set up wireguard mesh'
 task :wireguard do
@@ -36,7 +36,16 @@ task :hosts do
     only_when { hostname is :earth }
 
     file '/etc/hosts.test' do
-      add_line '192.168.1.101 foo'
+      ensure_line '192.168.1.101 foo'
+    end
+  end
+end
+
+desc 'foo'
+task :foo do
+  configure do
+    file '/tmp/foo.txt' do
+      ensure_line 'foo bar baz'
     end
   end
 end
diff --git a/lib/dsl.rb b/lib/dsl.rb
index f6f8e8e..1629afc 100644
--- a/lib/dsl.rb
+++ b/lib/dsl.rb
@@ -10,6 +10,7 @@ module RCM
   class DSL
     attr_reader :id
 
+    # TODO: Replace @@ with @ class variables
     @@rcm_counter = -1
     @@objs = {}
 
diff --git a/lib/dslkeywords/file.rb b/lib/dslkeywords/file.rb
index 7e24801..403f01e 100644
--- a/lib/dslkeywords/file.rb
+++ b/lib/dslkeywords/file.rb
@@ -28,21 +28,36 @@ module RCM
     def create_parent_directory = @create_parent = true
     def from_sourcefile = @from_sourcefile = true
     def from_template = @from_template = true
+    def ensure_line(line) = @ensure_line = line
 
     def evaluate!
-      create_parent_directory!
-      content = real_content
+      return evaluate_ensure_line! unless @ensure_line.nil?
 
-      info "Creating file #{@path}"
-      debug content if option :debug
+      write_content!(real_content)
+    end
+
+    private
+
+    def evaluate_ensure_line!
+      return write_content!(@ensure_line) unless ::File.file?(@path)
+
+      lines = ::File.readlines(@path, chomp: true)
+      return if lines.include?(@ensure_line)
 
+      ::File.open(@path, 'a') do |fd|
+        fd.puts(@ensure_line)
+      end
+    end
+
+    def write_content!(content)
+      create_parent_directory!
+      debug content if option :debug
+      info "Creating file #{@path}"
       tmp_path = "#{@path}.tmp"
       ::File.write(tmp_path, content)
       ::File.rename(tmp_path, @path)
     end
 
-    private
-
     def create_parent_directory!
       dirname = ::File.dirname(@path)
       return unless !::File.directory?(dirname) && @create_parent
-- 
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