Detect duplicate files coming from dependencies.

1 files changed, 20 insertions, 5 deletions

diff --git a/stdlib/source/program/compositor/import.lux b/stdlib/source/program/compositor/import.lux
index 318c3705c..edc0160f5 100644
--- a/stdlib/source/program/compositor/import.lux
+++ b/stdlib/source/program/compositor/import.lux
@@ -1,5 +1,5 @@
 (.module:
-  [lux #*
+  [lux (#- Module)
    [abstract
     ["." monad (#+ Monad do)]]
    [control
@@ -13,12 +13,18 @@
      ["<b>" binary]]]
    [data
     [binary (#+ Binary)]
-    ["." text]
+    ["." text
+     ["%" format (#+ format)]]
     [collection
      ["." dictionary (#+ Dictionary)]
      ["." row]]
     [format
      ["." tar]]]
+   [tool
+    [compiler
+     [meta
+      [archive
+       [descriptor (#+ Module)]]]]]
    [world
     ["." file (#+ Path File)]]]
   [//
@@ -29,6 +35,11 @@
 
 (exception: #export useless-tar-entry)
 
+(exception: #export (duplicate {library Library} {module Module})
+  (exception.report
+   ["Module" (%.text module)]
+   ["Library" (%.text library)]))
+
 (type: #export Import
   (Dictionary Path Binary))
 
@@ -44,9 +55,13 @@
        (monad.fold ! (function (_ entry import)
                        (case entry
                          (#tar.Normal [path instant mode ownership content])
-                         (dictionary.try-put (tar.from-path path)
-                                             (tar.data content)
-                                             import)
+                         (let [path (tar.from-path path)]
+                           (case (dictionary.try-put path (tar.data content) import)
+                             (#try.Success import)
+                             (wrap import)
+                             
+                             (#try.Failure error)
+                             (exception.throw ..duplicate [library path])))
                          
                          _
                          (exception.throw ..useless-tar-entry [])))