[release-2.6] On "reload" command, reload contents of file from disk irrespective of project presence and even if file already containing its own text

src/harness/unittests/tsserverProjectSystem.ts

@@ -3893,6 +3893,96 @@ namespace ts.projectSystem {
             assert.equal(snap2.getText(0, snap2.getLength()), f1.content, "content should be equal to the content of original file");
 
         });
+
+        it("should work when script info doesnt have any project open", () => {
+            const f1 = {
+                path: "/a/b/app.ts",
+                content: "let x = 1"
+            };
+            const tmp = {
+                path: "/a/b/app.tmp",
+                content: "const y = 42"
+            };
+            const host = createServerHost([f1, tmp, libFile]);
+            const session = createSession(host);
+            const openContent = "let z = 1";
+            // send open request
+            session.executeCommandSeq(<server.protocol.OpenRequest>{
+                command: server.protocol.CommandTypes.Open,
+                arguments: { file: f1.path, fileContent: openContent }
+            });
+
+            const projectService = session.getProjectService();
+            checkNumberOfProjects(projectService, { inferredProjects: 1 });
+            const info = projectService.getScriptInfo(f1.path);
+            assert.isDefined(info);
+            checkScriptInfoContents(openContent, "contents set during open request");
+
+            // send close request
+            session.executeCommandSeq(<server.protocol.CloseRequest>{
+                command: server.protocol.CommandTypes.Close,
+                arguments: { file: f1.path }
+            });
+            checkScriptInfoAndProjects(0, f1.content, "contents of closed file");
+
+            // Can reload contents of the file when its not open and has no project
+            // reload from temp file
+            session.executeCommandSeq(<server.protocol.ReloadRequest>{
+                command: server.protocol.CommandTypes.Reload,
+                arguments: { file: f1.path, tmpfile: tmp.path }
+            });
+            checkScriptInfoAndProjects(0, tmp.content, "contents of temp file");
+
+            // reload from own file
+            session.executeCommandSeq(<server.protocol.ReloadRequest>{
+                command: server.protocol.CommandTypes.Reload,
+                arguments: { file: f1.path }
+            });
+            checkScriptInfoAndProjects(0, f1.content, "contents of closed file");
+
+            // Open file again without setting its content
+            session.executeCommandSeq(<server.protocol.OpenRequest>{
+                command: server.protocol.CommandTypes.Open,
+                arguments: { file: f1.path }
+            });
+            checkScriptInfoAndProjects(1, f1.content, "contents of file when opened without specifying contents");
+            const snap = info.getSnapshot();
+
+            // send close request
+            session.executeCommandSeq(<server.protocol.CloseRequest>{
+                command: server.protocol.CommandTypes.Close,
+                arguments: { file: f1.path }
+            });
+            checkScriptInfoAndProjects(0, f1.content, "contents of closed file");
+            assert.strictEqual(info.getSnapshot(), snap);
+
+            // reload from temp file
+            session.executeCommandSeq(<server.protocol.ReloadRequest>{
+                command: server.protocol.CommandTypes.Reload,
+                arguments: { file: f1.path, tmpfile: tmp.path }
+            });
+            checkScriptInfoAndProjects(0, tmp.content, "contents of temp file");
+            assert.notStrictEqual(info.getSnapshot(), snap);
+
+            // reload from own file
+            session.executeCommandSeq(<server.protocol.ReloadRequest>{
+                command: server.protocol.CommandTypes.Reload,
+                arguments: { file: f1.path }
+            });
+            checkScriptInfoAndProjects(0, f1.content, "contents of closed file");
+            assert.notStrictEqual(info.getSnapshot(), snap);
+
+            function checkScriptInfoAndProjects(inferredProjects: number, contentsOfInfo: string, captionForContents: string) {
+                checkNumberOfProjects(projectService, { inferredProjects });
+                assert.strictEqual(projectService.getScriptInfo(f1.path), info);
+                checkScriptInfoContents(contentsOfInfo, captionForContents);
+            }
+
+            function checkScriptInfoContents(contentsOfInfo: string, captionForContents: string) {
+                const snap = info.getSnapshot();
+                assert.equal(snap.getText(0, snap.getLength()), contentsOfInfo, "content should be equal to " + captionForContents);
+            }
+        });
     });
 
     describe("Inferred projects", () => {

src/server/project.ts

@@ -946,16 +946,6 @@ namespace ts.server {
             }
         }
 
-        reloadScript(filename: NormalizedPath, tempFileName?: NormalizedPath): boolean {
-            const script = this.projectService.getScriptInfoForNormalizedPath(filename);
-            if (script) {
-                Debug.assert(script.isAttached(this));
-                script.reloadFromFile(tempFileName);
-                return true;
-            }
-            return false;
-        }
-
         /* @internal */
         getChangesSinceVersion(lastKnownVersion?: number): ProjectFilesWithTSDiagnostics {
             this.updateGraph();

src/server/scriptInfo.ts

@@ -67,7 +67,10 @@ namespace ts.server {
             this.lineMap = undefined;
         }
 
-        /** returns true if text changed */
+        /**
+         * Set the contents as newText
+         * returns true if text changed
+         */
         public reload(newText: string) {
             Debug.assert(newText !== undefined);
 
@@ -87,31 +90,31 @@ namespace ts.server {
             }
         }
 
-        /** returns true if text changed */
+        /**
+         * Reads the contents from tempFile(if supplied) or own file and sets it as contents
+         * returns true if text changed
+         */
+        public reloadWithFileText(tempFileName?: string) {
+            const reloaded = this.reload(this.getFileText(tempFileName));
+            this.ownFileText = !tempFileName || tempFileName === this.fileName;
+            return reloaded;
+        }
+
+        /**
+         * Reloads the contents from the file if there is no pending reload from disk or the contents of file are same as file text
+         * returns true if text changed
+         */
         public reloadFromDisk() {
-            let reloaded = false;
             if (!this.pendingReloadFromDisk && !this.ownFileText) {
-                reloaded = this.reload(this.getFileText());
-                this.ownFileText = true;
+                return this.reloadWithFileText();
             }
-            return reloaded;
+            return false;
         }
 
         public delayReloadFromFileIntoText() {
             this.pendingReloadFromDisk = true;
         }
 
-        /** returns true if text changed */
-        public reloadFromFile(tempFileName: string) {
-            let reloaded = false;
-            // Reload if different file or we dont know if we are working with own file text
-            if (tempFileName !== this.fileName || !this.ownFileText) {
-                reloaded = this.reload(this.getFileText(tempFileName));
-                this.ownFileText = !tempFileName || tempFileName === this.fileName;
-            }
-            return reloaded;
-        }
-
         public getSnapshot(): IScriptSnapshot {
             return this.useScriptVersionCacheIfValidOrOpen()
                 ? this.svc.getSnapshot()
@@ -180,8 +183,7 @@ namespace ts.server {
         private getOrLoadText() {
             if (this.text === undefined || this.pendingReloadFromDisk) {
                 Debug.assert(!this.svc || this.pendingReloadFromDisk, "ScriptVersionCache should not be set when reloading from disk");
-                this.reload(this.getFileText());
-                this.ownFileText = true;
+                this.reloadWithFileText();
             }
             return this.text;
         }
@@ -385,7 +387,7 @@ namespace ts.server {
                 this.markContainingProjectsAsDirty();
             }
             else {
-                if (this.textStorage.reloadFromFile(tempFileName)) {
+                if (this.textStorage.reloadWithFileText(tempFileName)) {
                     this.markContainingProjectsAsDirty();
                 }
             }

src/server/session.ts

@@ -1311,11 +1311,13 @@ namespace ts.server {
         private reload(args: protocol.ReloadRequestArgs, reqSeq: number) {
             const file = toNormalizedPath(args.file);
             const tempFileName = args.tmpfile && toNormalizedPath(args.tmpfile);
-            const project = this.projectService.getDefaultProjectForFile(file, /*ensureProject*/ true);
-            this.changeSeq++;
-            // make sure no changes happen before this one is finished
-            if (project.reloadScript(file, tempFileName)) {
-                this.doOutput(/*info*/ undefined, CommandNames.Reload, reqSeq, /*success*/ true);
+            const info = this.projectService.getScriptInfoForNormalizedPath(file);
+            if (info) {
+                this.changeSeq++;
+                // make sure no changes happen before this one is finished
+                if (info.reloadFromFile(tempFileName)) {
+                    this.doOutput(/*info*/ undefined, CommandNames.Reload, reqSeq, /*success*/ true);
+                }
             }
         }
 

tests/baselines/reference/api/tsserverlibrary.d.ts

@@ -7227,7 +7227,6 @@ declare namespace ts.server {
         getScriptInfo(uncheckedFileName: string): ScriptInfo;
         filesToString(writeProjectFileNames: boolean): string;
         setCompilerOptions(compilerOptions: CompilerOptions): void;
-        reloadScript(filename: NormalizedPath, tempFileName?: NormalizedPath): boolean;
         protected removeRoot(info: ScriptInfo): void;
     }
     /**