Allow erb in yaml

README.md

@@ -54,7 +54,7 @@ Usage: alerty [options] -- command
         --lock LOCK_FILE             exclusive lock file to prevent running a command duplicatedly (default: no lock)
         --retry-limit NUMBER         number of retries (default: 0)
         --retry-wait SECONDS         retry interval = retry wait +/- 12.5% randomness (default: 1.0)
-    -d, --debug                      debug mode (same with --log-level debug)
+    -d, --debug                      debug mode
 ```
 
 ## Plugins

example.yml

@@ -5,6 +5,6 @@ lock_path: log/lock
 plugins:
   - type: stdout
   - type: file
-    path: log/file.log
+    path: log/<%= ENV['FILE'] || 'file' %>.log
   - type: exec
     command: cat > log/exec.log

lib/alerty/cli.rb

@@ -43,8 +43,8 @@ def parse_options(argv = ARGV)
       op.on('--retry-wait SECONDS', "retry interval = retry wait +/- 12.5% randomness (default: 1.0)") {|v|
         opts[:retry_wait] = v.to_f
       }
-      op.on('-d', '--debug', "debug mode (same with --log-level debug)") {|v|
-        opts[:log_level] = 'debug'
+      op.on('-d', '--debug', "debug mode") {|v|
+        opts[:debug] = true
       }
 
       op.parse!(argv)

lib/alerty/config.rb

@@ -1,4 +1,5 @@
 require 'yaml'
+require 'erb'
 require 'hashie/mash'
 
 class Alerty
@@ -15,7 +16,14 @@ def config_path
       end
 
       def config
-        @config ||= Hashie::Mash.new(YAML.load_file(config_path))
+        @config ||=
+          begin
+            content = File.read(config_path)
+            erb = ERB.new(content, nil, '-')
+            erb_content = erb.result
+            puts erb_content if debug?
+            Hashie::Mash.new(YAML.load(erb_content))
+          end
       end
 
       def log_path
@@ -50,6 +58,10 @@ def retry_wait
         opts[:retry_wait] || config.retry_wait || 1.0
       end
 
+      def debug?
+        !!opts[:debug]
+      end
+
       def retry_interval
         @random ||= Random.new
         randomness = retry_wait * 0.125