Add APIs to provide project info for a given file

Return the path of the config file and the file name list of the project
(optionally). This is helpful in differentiate the build command
behavior for loose files and configured projects in sublime.

src/server/editorServices.ts

@@ -305,6 +305,11 @@ module ts.server {
             return this.projectService.openFile(filename, false);
         }
 
+        getFileNameList() {
+            let sourceFiles = this.program.getSourceFiles();
+            return sourceFiles.map(sourceFile => sourceFile.fileName);
+        }
+
         getSourceFile(info: ScriptInfo) {
             return this.filenameToSourceFile[info.fileName];
         }

src/server/protocol.d.ts

@@ -87,6 +87,28 @@ declare module ts.server.protocol {
         file: string;
     }
 
+    /** 
+      * Arguments for ProjectInfo messages.
+      */
+    export interface ProjectInfoRequestArgs {
+        /**
+          * The file for the request (absolute pathname required).
+          */
+        file: string;
+        /**
+          * Indicate if the file name list of the project is needed
+          */
+        needFileNameList: boolean;
+    }
+
+    /** 
+      * Response message for "projectInfo" request
+      */
+    export interface ProjectInfo {
+        configFileName: string;
+        fileNameList?: string[];
+    }
+
     /**
       * Request whose sole parameter is a file name.
       */

src/server/session.ts

@@ -96,8 +96,9 @@ module ts.server {
         export var Reload = "reload";
         export var Rename = "rename";
         export var Saveto = "saveto";
-        export var SignatureHelp = "signatureHelp";        
-        export var TypeDefinition = "typeDefinition";        
+        export var SignatureHelp = "signatureHelp";
+        export var TypeDefinition = "typeDefinition";
+        export var ProjectInfo = "projectInfo";
         export var Unknown = "unknown";
     }
 
@@ -338,6 +339,20 @@ module ts.server {
             });
         }
 
+        getProjectInfo(fileName: string, needFileNameList: boolean): protocol.ProjectInfo {
+            fileName = ts.normalizePath(fileName)
+            let project = this.projectService.getProjectForFile(fileName)
+
+            let projectInfo: protocol.ProjectInfo = {
+                configFileName: project.projectFilename
+            }
+
+            if (needFileNameList) {
+                projectInfo.fileNameList = project.getFileNameList();
+            }
+            return projectInfo;
+        }
+
         getRenameLocations(line: number, offset: number, fileName: string,findInComments: boolean, findInStrings: boolean): protocol.RenameResponseBody {
             var file = ts.normalizePath(fileName);
             var project = this.projectService.getProjectForFile(file);
@@ -951,6 +966,11 @@ module ts.server {
                         response = this.getOccurrences(line, offset, fileName);
                         break;
                     }
+                    case CommandNames.ProjectInfo: {
+                        var { file, needFileNameList } = <protocol.ProjectInfoRequestArgs>request.arguments;
+                        response = this.getProjectInfo(file, needFileNameList);
+                        break;
+                    }
                     default: {
                         this.projectService.log("Unrecognized JSON command: " + message);
                         this.output(undefined, CommandNames.Unknown, request.seq, "Unrecognized JSON command: " + request.command);