interpolate node variable values

Empty value was variably considered "" or nil, now it will always be ""
string.

Now "nil", "false", "true" strings are converted to their respective
types nil, false and true.

This also means we cannot have verbatim strings by that name, like if
your password was "false", you're shit out of luck. If this is the case,
we can add some __false__ hack or consider other similar solutions.

Fixes #500
Fixes #534

May break stuff with ""/nil changing now, but as it was not consistent
to begin with, I find it acceptable. Users now may need to manually
enter nil in some fields to regain old behaviour.

4 files changed, 24 insertions, 6 deletions

diff --git a/lib/oxidized/source/csv.rb b/lib/oxidized/source/csv.rb
index a0ce848..be5c4a6 100644
--- a/lib/oxidized/source/csv.rb
+++ b/lib/oxidized/source/csv.rb
@@ -20,7 +20,7 @@ class CSV < Source
     nodes = []
     open(File.expand_path @cfg.file).each_line do |line|
       next if line.match(/^\s*#/)
-      data  = line.chomp.split @cfg.delimiter
+      data  = line.chomp.split(@cfg.delimiter, -1)
       next if data.empty?
       # map node parameters
       keys = {}
@@ -29,9 +29,11 @@ class CSV < Source
       end
       keys[:model] = map_model keys[:model] if keys.key? :model
 
-      # map node specific vars, empty value is considered as nil
+      # map node specific vars
       vars = {}
-      @cfg.vars_map.each { |key, position| vars[key.to_sym] = data[position].to_s.empty? ? nil : data[position] }
+      @cfg.vars_map.each do |key, position|
+        vars[key.to_sym] = node_var_interpolate data[position]
+      end
       keys[:vars] = vars unless vars.empty?
 
       nodes << keys
diff --git a/lib/oxidized/source/http.rb b/lib/oxidized/source/http.rb
index 93361a2..38387ad 100644
--- a/lib/oxidized/source/http.rb
+++ b/lib/oxidized/source/http.rb
@@ -43,9 +43,11 @@ class HTTP < Source
       end
       keys[:model] = map_model keys[:model] if keys.key? :model
 
-      # map node specific vars, empty value is considered as nil
+      # map node specific vars
       vars = {}
-      @cfg.vars_map.each { |key, position| vars[key.to_sym] = line[position].to_s.empty? ? nil : line[position] }
+      @cfg.vars_map.each do |key, position|
+        vars[key.to_sym] = node_var_interpolate line[position]
+      end
       keys[:vars] = vars unless vars.empty?
 
       nodes << keys
diff --git a/lib/oxidized/source/source.rb b/lib/oxidized/source/source.rb
index 7862dd1..9b8bc94 100644
--- a/lib/oxidized/source/source.rb
+++ b/lib/oxidized/source/source.rb
@@ -1,11 +1,23 @@
 module Oxidized
   class Source
     class NoConfig < OxidizedError; end
+
     def initialize
       @map = (Oxidized.config.model_map or {})
     end
+
     def map_model model
       @map.has_key?(model) ? @map[model] : model
     end
+
+    def node_var_interpolate var
+       case var
+       when "nil"   then nil
+       when "false" then false
+       when "true"  then true
+       else var
+       end
+    end
+
   end
 end
diff --git a/lib/oxidized/source/sql.rb b/lib/oxidized/source/sql.rb
index fc1caa8..ba85447 100644
--- a/lib/oxidized/source/sql.rb
+++ b/lib/oxidized/source/sql.rb
@@ -31,7 +31,9 @@ class SQL < Source
 
       # map node specific vars
       vars = {}
-      @cfg.vars_map.each { |key, sql_column| vars[key.to_sym] = node[sql_column.to_sym] }
+      @cfg.vars_map.each do |key, sql_column|
+        vars[key.to_sym] = node_var_interpolate node[sql_column.to_sym]
+      end
       keys[:vars] = vars unless vars.empty?
 
       nodes << keys