1 files changed, 57 insertions, 18 deletions

diff --git a/stdlib/source/lux.lux b/stdlib/source/lux.lux
index e31e96e7c..205f1a543 100644
--- a/stdlib/source/lux.lux
+++ b/stdlib/source/lux.lux
@@ -662,12 +662,12 @@
                                                 #Nil))))]
                   default-def-meta-exported)))
 
-## (type: Compiler-Mode
+## (type: Mode
 ##   #Build
 ##   #Eval
 ##   #REPL)
-(_lux_def Compiler-Mode
-  (#Named ["lux" "Compiler-Mode"]
+(_lux_def Mode
+  (#Named ["lux" "Mode"]
           (#Sum ## Build
            #Unit
            (#Sum ## Eval
@@ -683,31 +683,31 @@
                           (text$ "A sign that shows the conditions under which the compiler is running.")]
                          default-def-meta-exported))))
 
-## (type: Compiler-Info
-##   {#compiler-name Text
-##    #compiler-version Text
-##    #compiler-mode    Compiler-Mode})
-(_lux_def Compiler-Info
-  (#Named ["lux" "Compiler-Info"]
+## (type: Info
+##   {#target  Text
+##    #version Text
+##    #mode    Mode})
+(_lux_def Info
+  (#Named ["lux" "Info"]
           (#Product
-           ## compiler-name
+           ## target
            Text
            (#Product
-            ## compiler-version
+            ## version
             Text
-            ## compiler-mode
-            Compiler-Mode)))
+            ## mode
+            Mode)))
   (record$ (#Cons [(tag$ ["lux" "tags"])
-                   (tuple$ (#Cons (text$ "compiler-name")
-                                  (#Cons (text$ "compiler-version")
-                                         (#Cons (text$ "compiler-mode")
+                   (tuple$ (#Cons (text$ "target")
+                                  (#Cons (text$ "version")
+                                         (#Cons (text$ "mode")
                                                 #Nil))))]
                   (#Cons [(tag$ ["lux" "doc"])
                           (text$ "Information about the current version and type of compiler that is running.")]
                          default-def-meta-exported))))
 
 ## (type: Compiler
-##   {#info            Compiler-Info
+##   {#info            Info
 ##    #source          Source
 ##    #cursor          Cursor
 ##    #modules         (List [Text Module])
@@ -720,7 +720,7 @@
 (_lux_def Compiler
   (#Named ["lux" "Compiler"]
           (#Product ## "lux;info"
-           Compiler-Info
+           Info
            (#Product ## "lux;source"
             Source
             (#Product ## "lux;cursor"
@@ -5867,3 +5867,42 @@
 (type: #export (Array a)
   {#;doc "Mutable arrays."}
   (#;Host "#Array" (#;Cons a #;Nil)))
+
+(def: target
+  (Meta Text)
+  (function [compiler]
+    (#;Right [compiler (get@ [#info #target] compiler)])))
+
+(def: (pick-for-target target options)
+  (-> Text (List [Code Code]) (Maybe Code))
+  (case options
+    #;Nil
+    #;None
+
+    (#;Cons [key value] options')
+    (case key
+      (^multi [_ (#Text platform)]
+              (text/= target platform))
+      (#;Some value)
+
+      _
+      (pick-for-target target options'))
+    ))
+
+(macro: #export (for tokens)
+  (do Monad<Meta>
+    [target target]
+    (case tokens
+      (^ (list [_ (#Record options)]))
+      (case (pick-for-target target options)
+        (#;Some pick)
+        (wrap (list pick))
+
+        #;None
+        (wrap (list)))
+      
+      (^ (list [_ (#Record options)] default))
+      (wrap (list (;;default default (pick-for-target target options))))
+
+      _
+      (fail "Wrong syntax for 'for'"))))