create ProjectContext in single-file mode to guarantee engine and target caching

src/command/preview/cmd.ts

@@ -52,6 +52,7 @@ import { previewShiny } from "./preview-shiny.ts";
 import { serve } from "../serve/serve.ts";
 import { fileExecutionEngine } from "../../execute/engine.ts";
 import { notebookContext } from "../../render/notebook/notebook-context.ts";
+import { singleFileProjectContext } from "../../project/types/single-file/single-file.ts";
 
 export const previewCommand = new Command()
   .name("preview")
@@ -275,7 +276,8 @@ export const previewCommand = new Command()
     if (Deno.statSync(file).isFile) {
       // get project and preview format
       const nbContext = notebookContext();
-      const project = await projectContext(dirname(file), nbContext);
+      const project = (await projectContext(dirname(file), nbContext)) ||
+        singleFileProjectContext(file, nbContext);
       const formats = await (async () => {
         const services = renderServices(nbContext);
         try {

src/command/preview/preview.ts

@@ -100,6 +100,7 @@ import {
   rswURL,
 } from "../../core/previewurl.ts";
 import { notebookContext } from "../../render/notebook/notebook-context.ts";
+import { singleFileProjectContext } from "../../project/types/single-file/single-file.ts";
 
 export async function resolvePreviewOptions(
   options: ProjectPreview,
@@ -365,11 +366,13 @@ export async function previewFormat(
   if (format) {
     return format;
   }
+  const nbContext = notebookContext();
+  project = project || singleFileProjectContext(file, nbContext);
   formats = formats ||
     await withRenderServices(
-      notebookContext(),
+      nbContext,
       (services: RenderServices) =>
-        renderFormats(file, services, "all", project),
+        renderFormats(file, services, "all", project!),
     );
   format = Object.keys(formats)[0] || "html";
   return format;

src/command/render/render-contexts.ts

@@ -210,7 +210,7 @@ export async function renderContexts(
   options: RenderOptions,
   forExecute: boolean,
   notebookContext: NotebookContext,
-  project?: ProjectContext,
+  project: ProjectContext,
   cloneOptions: boolean = true,
   enforceProjectFormats: boolean = true,
 ): Promise<Record<string, RenderContext>> {
@@ -304,11 +304,10 @@ export async function renderContexts(
       if (engineClaimReason === "markdown") {
         // since the content decided the engine, and the content now changed,
         // we need to re-evaluate the engine and target based on new content.
-        const { engine, target } = await fileExecutionEngineAndTarget(
+        const { engine, target } = await project.fileExecutionEngineAndTarget(
           file.path,
-          options.flags,
           markdown,
-          project,
+          true,
         );
         context.engine = engine;
         context.target = target;
@@ -327,7 +326,7 @@ export async function renderFormats(
   file: string,
   services: RenderServices,
   to = "all",
-  project?: ProjectContext,
+  project: ProjectContext,
 ): Promise<Record<string, Format>> {
   const contexts = await renderContexts(
     { path: file },

src/command/render/render-files.ts

@@ -288,9 +288,9 @@ export async function renderFiles(
   files: RenderFile[],
   options: RenderOptions,
   notebookContext: NotebookContext,
-  alwaysExecuteFiles?: string[],
-  pandocRenderer?: PandocRenderer,
-  project?: ProjectContext,
+  alwaysExecuteFiles: string[] | undefined,
+  pandocRenderer: PandocRenderer | undefined,
+  project: ProjectContext,
 ): Promise<RenderFilesResult> {
   // provide default renderer
   pandocRenderer = pandocRenderer || defaultPandocRenderer(options, project);
@@ -368,7 +368,7 @@ export async function renderFile(
   file: RenderFile,
   options: RenderOptions,
   services: RenderServices,
-  project?: ProjectContext,
+  project: ProjectContext,
   enforceProjectFormats: boolean = true,
 ): Promise<RenderFilesResult> {
   // provide default renderer
@@ -420,7 +420,7 @@ async function renderFileInternal(
   lifetime: Lifetime,
   file: RenderFile,
   options: RenderOptions,
-  project: ProjectContext | undefined,
+  project: ProjectContext,
   pandocRenderer: PandocRenderer,
   files: RenderFile[],
   tempContext: TempContext,
@@ -456,6 +456,8 @@ async function renderFileInternal(
     const { engine, target } = await fileExecutionEngineAndTarget(
       file.path,
       options.flags,
+      undefined,
+      project,
     );
     const validationResult = await validateDocumentFromSource(
       target.markdown,
@@ -695,7 +697,7 @@ async function renderFileInternal(
 // default pandoc renderer immediately renders each execute result
 function defaultPandocRenderer(
   _options: RenderOptions,
-  _project?: ProjectContext,
+  _project: ProjectContext,
 ): PandocRenderer {
   const renderCompletions: PandocRenderCompletion[] = [];
   const renderedFiles: RenderedFile[] = [];

src/command/render/render-shared.ts

@@ -18,7 +18,10 @@ import { renderProject } from "./project.ts";
 import { renderFiles } from "./render-files.ts";
 import { resourceFilesFromRenderedFile } from "./resources.ts";
 import { RenderFlags, RenderOptions, RenderResult } from "./types.ts";
-import { fileExecutionEngine } from "../../execute/engine.ts";
+import {
+  fileExecutionEngine,
+  fileExecutionEngineAndTarget,
+} from "../../execute/engine.ts";
 
 import {
   isProjectInputFile,
@@ -33,6 +36,7 @@ import { initYamlIntelligenceResourcesFromFilesystem } from "../../core/schema/u
 import { kTextPlain } from "../../core/mime.ts";
 import { normalizePath } from "../../core/path.ts";
 import { notebookContext } from "../../render/notebook/notebook-context.ts";
+import { singleFileProjectContext } from "../../project/types/single-file/single-file.ts";
 
 export async function render(
   path: string,
@@ -95,11 +99,24 @@ export async function render(
   // validate that we didn't get any project-only options
   validateDocumentRenderFlags(options.flags);
 
+  // NB: singleFileProjectContext is currently not fully-featured
+  context = singleFileProjectContext(path, nbContext, options.flags);
+
   // otherwise it's just a file render
-  const result = await renderFiles([{ path }], options, nbContext);
+  const result = await renderFiles(
+    [{ path }],
+    options,
+    nbContext,
+    undefined,
+    undefined,
+    context,
+  );
 
   // get partitioned markdown if we had result files
-  const engine = fileExecutionEngine(path);
+  const { engine } = await context.fileExecutionEngineAndTarget(
+    path,
+    undefined,
+  );
   const partitioned = (engine && result.files.length > 0)
     ? await engine.partitionedMarkdown(path)
     : undefined;
@@ -126,6 +143,7 @@ export async function render(
       };
     })),
     error: result.error,
+    baseDir: normalizePath(dirname(path)),
   };
 
   if (!renderResult.error && engine?.postRender) {

src/command/render/types.ts

@@ -59,7 +59,7 @@ export interface RenderContext {
   engine: ExecutionEngine;
   format: Format;
   libDir: string;
-  project?: ProjectContext;
+  project: ProjectContext;
   active: boolean;
 }
 

src/command/serve/cmd.ts

@@ -18,6 +18,7 @@ import { previewFormat } from "../preview/preview.ts";
 import { withRenderServices } from "../render/render-services.ts";
 import { notebookContext } from "../../render/notebook/notebook-context.ts";
 import { RenderServices } from "../render/types.ts";
+import { singleFileProjectContext } from "../../project/types/single-file/single-file.ts";
 
 export const serveCommand = new Command()
   .name("serve")
@@ -65,7 +66,8 @@ export const serveCommand = new Command()
     const { host, port } = await resolveHostAndPort(options);
 
     const nbContext = notebookContext();
-    const context = await projectContext(input, nbContext);
+    const context = (await projectContext(input, nbContext)) ||
+      singleFileProjectContext(input, nbContext);
     const formats = await withRenderServices(
       nbContext,
       (services: RenderServices) =>

src/core/jupyter/jupyter-embed.ts

@@ -157,7 +157,7 @@ function unsupportedEmbed(path: string) {
 export async function ensureNotebookContext(
   markdown: string,
   services: RenderServices,
-  context?: ProjectContext,
+  context: ProjectContext,
 ) {
   const regex = placeholderRegex();
   let match = regex.exec(markdown);
@@ -353,9 +353,9 @@ export async function replaceNotebookPlaceholders(
   };
 }
 
-function resolveNbPath(input: string, path: string, context?: ProjectContext) {
+function resolveNbPath(input: string, path: string, context: ProjectContext) {
   // If this is a project, absolute means project relative
-  if (context) {
+  if (!context.isSingleFile) {
     const projectMatch = path.match(/^[\\/](.*)/);
     if (projectMatch) {
       return join(context.dir, projectMatch[1]);
@@ -368,8 +368,9 @@ function resolveNbPath(input: string, path: string, context?: ProjectContext) {
     if (isAbsolute(input)) {
       return join(dirname(input), path);
     } else {
-      const baseDir = context ? context.dir : Deno.cwd();
-      return join(baseDir, dirname(input), path);
+      const baseDir = context.isSingleFile ? Deno.cwd() : context.dir;
+      const result = join(baseDir, dirname(input), path);
+      return result;
     }
   }
 }
@@ -803,7 +804,7 @@ function resolveRange(rangeRaw?: string) {
 function jupyterFromNotebookOrQmd(
   nbAbsPath: string,
   services: RenderServices,
-  project?: ProjectContext,
+  project: ProjectContext,
 ) {
   // See if we can resolve non-notebooks. Note that this
   // requires that we have pre-rendered any notebooks that we discover