Language Server: Adds support for configuring extra include paths ``i…

…nclude-paths`` JSON settings object that can be passed during LSP configuration stage.

Changelog.md

@@ -14,6 +14,7 @@ Compiler Features:
  * SMTChecker: Support ``abi.encodeCall`` taking into account the called selector.
  * Language Server: Allow full filesystem access to language server.
  * Language Server: Always adds ``{project_root}/node_modules`` to include search paths.
+ * Language Server: Adds support for configuring extra include paths ``include-paths`` JSON settings object that can be passed during LSP configuration stage.
 
 
 Bugfixes:

libsolidity/lsp/FileRepository.cpp

@@ -38,7 +38,19 @@ using solidity::util::Result;
 
 FileRepository::FileRepository(boost::filesystem::path _basePath): m_basePath(std::move(_basePath))
 {
-	m_includePaths.emplace_back(m_basePath / "node_modules");
+}
+
+void FileRepository::setIncludePaths(std::vector<boost::filesystem::path> _paths)
+{
+	// Prefix relative paths with base-path.
+	for (auto& path: _paths)
+		if (path.is_relative())
+			path = m_basePath / path;
+
+	// Always have {projectRoot}/node_modules in the include-paths.
+	_paths.emplace_back(m_basePath / "node_modules");
+
+	m_includePaths = std::move(_paths);
 }
 
 string FileRepository::sourceUnitNameToUri(string const& _sourceUnitName) const

libsolidity/lsp/FileRepository.h

@@ -31,6 +31,8 @@ class FileRepository
 public:
 	explicit FileRepository(boost::filesystem::path _basePath);
 
+	void setIncludePaths(std::vector<boost::filesystem::path> _paths);
+
 	boost::filesystem::path const& basePath() const { return m_basePath; }
 
 	/// Translates a compiler-internal source unit name to an LSP client path.

libsolidity/lsp/LanguageServer.cpp

@@ -101,6 +101,21 @@ Json::Value LanguageServer::toJson(SourceLocation const& _location)
 void LanguageServer::changeConfiguration(Json::Value const& _settings)
 {
 	m_settingsObject = _settings;
+	if (_settings["include-paths"] && _settings["include-paths"].isArray())
+	{
+		std::vector<boost::filesystem::path> includePaths;
+		Json::Value jsonIncludePaths = _settings["includes"];
+		for (Json::Value jsonPath : jsonIncludePaths)
+		{
+			if (!jsonPath.isString())
+			{
+				m_client.trace("Invalid JSON configuration passed. \"include-paths\" must be an array of strings.");
+				continue;
+			}
+			includePaths.emplace_back(boost::filesystem::path(jsonPath.asString()));
+		}
+		m_fileRepository.setIncludePaths(move(includePaths));
+	}
 }
 
 void LanguageServer::compile()