lib/alf/shell/support.rb in alf-shell-0.14.0 vs lib/alf/shell/support.rb in alf-shell-0.15.0

@@ -1,28 +1,36 @@
 module Alf
   module Shell
     module Support
 
+      AlfFile = ->(arg){
+        path = Path(arg)
+        path.file? and path.ext =~ /^\.?alf$/
+      }
+
       def connection
         requester && requester.connection
       end
 
-      def compiler
-        @compiler ||= (connection && connection.compiler) || Engine::Compiler.new(nil)
-      end
-
-      def operands(argv, size = nil)
-        operands = [ stdin_operand ] + Array(argv)
-        operands = operands[(operands.size - size)..-1] if size
-        operands = operands.map{|arg|
-          arg = connection.relvar(arg) if arg.is_a?(String)
+      def operand(arg)
+        case arg
+        when AlfFile then operand(Path(arg).read)
+        when String  then connection.relvar(arg)
+        when Array   then operand(arg.first)
+        else
           Algebra::Operand.coerce(arg)
-        }
-        operands
+        end
       end
 
-      def stdin_operand
-        requester.stdin_operand rescue $stdin
+      def show_help(who)
+        who = "alf-#{who}" if /explain|metadata|show/ =~ who
+        if p = Path.backfind("doc/man/#{who}.man")
+          exit if system("man #{p}")
+          puts Path.backfind("doc/txt/#{who}.txt").read
+        else
+          puts "Unknown command/operator `#{who}`"
+        end
+        exit
       end
 
     end # module Support
   end # module Shell
 end # module Alf