X-Git-Url: http://nitlanguage.org

diff --git a/src/loader.nit b/src/loader.nit
index 72921c7..492584b 100644
--- a/src/loader.nit
+++ b/src/loader.nit
@@ -330,8 +330,21 @@ redef class ModelBuilder
 
 	# Return the mgroup associated to a directory path.
 	# If the directory is not a group null is returned.
+	#
+	# Note: `paths` is also used to look for mgroups
 	fun get_mgroup(dirpath: String): nullable MGroup
 	do
+		if not dirpath.file_exists then do
+			for p in paths do
+				var try = p / dirpath
+				if try.file_exists then
+					dirpath = try
+					break label
+				end
+			end
+			return null
+		end label
+
 		var rdp = module_absolute_path(dirpath)
 		if mgroups.has_key(rdp) then
 			return mgroups[rdp]
@@ -372,11 +385,7 @@ redef class ModelBuilder
 		var readme = dirpath2.join_path("README.md")
 		if not readme.file_exists then readme = dirpath2.join_path("README")
 		if readme.file_exists then
-			var mdoc = new MDoc
-			var s = new IFStream.open(readme)
-			while not s.eof do
-				mdoc.content.add(s.read_line)
-			end
+			var mdoc = load_markdown(readme)
 			mgroup.mdoc = mdoc
 			mdoc.original_mentity = mgroup
 		end
@@ -385,6 +394,17 @@ redef class ModelBuilder
 		return mgroup
 	end
 
+	# Load a markdown file as a documentation object
+	fun load_markdown(filepath: String): MDoc
+	do
+		var mdoc = new MDoc(new Location(new SourceFile.from_string(filepath, ""),0,0,0,0))
+		var s = new FileReader.open(filepath)
+		while not s.eof do
+			mdoc.content.add(s.read_line)
+		end
+		return mdoc
+	end
+
 	# Force the identification of all ModulePath of the group and sub-groups.
 	fun visit_group(mgroup: MGroup) do
 		var p = mgroup.filepath
@@ -417,7 +437,7 @@ redef class ModelBuilder
 		self.toolcontext.info("load module {filename}", 2)
 
 		# Load the file
-		var file = new IFStream.open(filename)
+		var file = new FileReader.open(filename)
 		var lexer = new Lexer(new SourceFile(filename, file))
 		var parser = new Parser(lexer)
 		var tree = parser.parse
@@ -435,6 +455,26 @@ redef class ModelBuilder
 		return nmodule
 	end
 
+	# Remove Nit source files from a list of arguments.
+	#
+	# Items of `args` that can be loaded as a nit file will be removed from `args` and returned.
+	fun filter_nit_source(args: Array[String]): Array[String]
+	do
+		var keep = new Array[String]
+		var res = new Array[String]
+		for a in args do
+			var l = identify_file(a)
+			if l == null then
+				keep.add a
+			else
+				res.add a
+			end
+		end
+		args.clear
+		args.add_all(keep)
+		return res
+	end
+
 	# Try to load a module using a path.
 	# Display an error if there is a problem (IO / lexer / parser) and return null.
 	# Note: usually, you do not need this method, use `get_mmodule_by_name` instead.
@@ -446,7 +486,11 @@ redef class ModelBuilder
 		# Look for the module
 		var file = identify_file(filename)
 		if file == null then
-			toolcontext.error(null, "Error: cannot find module `{filename}`.")
+			if filename.file_exists then
+				toolcontext.error(null, "Error: `{filename}` is not a Nit source file.")
+			else
+				toolcontext.error(null, "Error: cannot find module `{filename}`.")
+			end
 			return null
 		end
 
@@ -508,12 +552,31 @@ redef class ModelBuilder
 			end
 		end
 
+		# Check for conflicting module names in the project
+		if mgroup != null then
+			var others = model.get_mmodules_by_name(mod_name)
+			if others != null then for other in others do
+				if other.mgroup!= null and other.mgroup.mproject == mgroup.mproject then
+					var node: ANode
+					if decl == null then node = nmodule else node = decl.n_name
+					error(node, "Error: A module named `{other.full_name}` already exists at {other.location}")
+					break
+				end
+			end
+		end
+
 		# Create the module
 		var mmodule = new MModule(model, mgroup, mod_name, nmodule.location)
 		nmodule.mmodule = mmodule
 		nmodules.add(nmodule)
 		self.mmodule2nmodule[mmodule] = nmodule
 
+		var source = nmodule.location.file
+		if source != null then
+			assert source.mmodule == null
+			source.mmodule = mmodule
+		end
+
 		if decl != null then
 			# Extract documentation
 			var ndoc = decl.n_doc
@@ -660,6 +723,11 @@ redef class MGroup
 
 end
 
+redef class SourceFile
+	# Associated mmodule, once created
+	var mmodule: nullable MModule = null
+end
+
 redef class AStdImport
 	# The imported module once determined
 	var mmodule: nullable MModule = null