Merge pull request #12132 from MichaelHatherly/mh/stdout-colour-html

Support colour output in stdout for `jupyter` and `julia` engines

news/changelog-1.7.md

@@ -94,3 +94,4 @@ All changes included in 1.7:
 - ([#10532](https://github.com/quarto-dev/quarto-cli/issues/10532)): Quarto changed default of `--headless=old` to `--headless` as [Chrome 132 has removed old headless mode](https://developer.chrome.com/blog/removing-headless-old-from-chrome) and only support new mode. For using old mode, `QUARTO_CHROMIUM` could be set to a [new `chrome-headless-shell` binary](https://developer.chrome.com/blog/chrome-headless-shell) or too an older chrome version (between 128 and 132) and `QUARTO_CHROMIUM_HEADLESS_MODE` set to `old` for using old headless mode with that compatabitle version.
 - ([#10961](https://github.com/quarto-dev/quarto-cli/issues/10961)): Add more information on which Chrome Headless will be used in `quarto check install`. This is helpful to help debug mermaid issues.
 - ([#11951](https://github.com/quarto-dev/quarto-cli/issues/11951)): Raw LaTeX table without `tbl-` prefix label for using Quarto crossref are now correctly passed through unmodified.
+- ([#12117](https://github.com/quarto-dev/quarto-cli/issues/12117)): Color output to stdout and stderr is now correctly rendered for `html` format in the Jupyter and Julia engines.

src/core/jupyter/jupyter.ts

@@ -1629,7 +1629,7 @@ async function mdFromCodeCell(
           }
           md.push(text.join(""));
         } else {
-          md.push(mdOutputStream(stream));
+          md.push(await mdOutputStream(stream, options));
         }
       } else if (output.output_type === "error") {
         md.push(await mdOutputError(output as JupyterOutputError, options));
@@ -1766,7 +1766,7 @@ function isMarkdown(output: JupyterOutput, options: JupyterToMarkdownOptions) {
   return isDisplayDataType(output, options, displayDataIsMarkdown);
 }
 
-function mdOutputStream(output: JupyterOutputStream) {
+async function mdOutputStream(output: JupyterOutputStream, options: JupyterToMarkdownOptions) {
   let text: string[] = [];
   if (typeof output.text === "string") {
     text = [output.text];
@@ -1781,14 +1781,23 @@ function mdOutputStream(output: JupyterOutputStream) {
         /<ipython-input.*?>:\d+:\s+/,
         "",
       );
-      return mdCodeOutput(
-        [firstLine, ...text.slice(1)].map(colors.stripColor),
-      );
+      text = [firstLine, ...text.slice(1)];
     }
   }
 
-  // normal default handling
-  return mdCodeOutput(text.map(colors.stripColor));
+  if (options.toHtml && text.some(hasAnsiEscapeCodes)) {
+    const linesHTML = await convertToHtmlSpans(text.join("\n"));
+    return mdMarkdownOutput(
+      [
+        "\n::: {.ansi-escaped-output}\n```{=html}\n<pre>",
+        linesHTML,
+        "</pre>\n```\n:::\n",
+      ],
+    );
+  } else {
+    // normal default behavior
+    return mdCodeOutput(text.map(colors.stripColor));
+  }
 }
 
 async function mdOutputError(
@@ -1864,8 +1873,8 @@ async function mdOutputDisplayData(
       // if output is invalid, warn and emit empty
       const data = output.data[mimeType] as unknown;
       if (!Array.isArray(data) || data.some((s) => typeof s !== "string")) {
-        return mdWarningOutput(`Unable to process text plain output data 
-which does not appear to be plain text: ${JSON.stringify(data)}`);
+        return await mdWarningOutput(`Unable to process text plain output data 
+which does not appear to be plain text: ${JSON.stringify(data)}`, options);
       }
       const lines = data as string[];
       // pandas inexplicably outputs html tables as text/plain with an enclosing single-quote
@@ -1900,9 +1909,10 @@ which does not appear to be plain text: ${JSON.stringify(data)}`);
   }
 
   // no type match found
-  return mdWarningOutput(
+  return await mdWarningOutput(
     "Unable to display output for mime type(s): " +
-      Object.keys(output.data).join(", "),
+    Object.keys(output.data).join(", "),
+    options,
   );
 }
 
@@ -2061,12 +2071,12 @@ function mdEnclosedOutput(begin: string, text: string[], end: string) {
   return md.join("");
 }
 
-function mdWarningOutput(msg: string) {
-  return mdOutputStream({
+async function mdWarningOutput(msg: string, options: JupyterToMarkdownOptions) {
+  return await mdOutputStream({
     output_type: "stream",
     name: "stderr",
     text: [msg],
-  });
+  }, options);
 }
 
 function isWarningOutput(output: JupyterOutput) {

tests/docs/smoke-all/2025/02/21/12132.qmd

@@ -0,0 +1,18 @@
+---
+engine: julia
+format: html
+_quarto:
+  tests:
+    html:
+      ensureHtmlElements:
+        - ["div.cell-output-stdout div.ansi-escaped-output pre span.ansi-red-fg.ansi-bold"]
+        - ["div.cell-output-stdout div.ansi-escaped-output pre span.ansi-red-cyan-bold"]
+---
+
+```{julia}
+printstyled("red"; color = :red, bold = true)
+```
+
+```{julia}
+@info "logging"
+```