allow '=' in values of pandoc key=value pairs (#814)

* allow '=' in values of pandoc key=value pairs

* add snapshot test

* actually run the test

* update changelog; tweaks

* remove debugging code

Author: kevinushey

apps/vscode/CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## 1.125.0 (Unreleased)
 
+- Fixed an issue where attribute values containing '='s could be truncated in some scenarios (<https://github.com/quarto-dev/quarto/pull/814>).
+
 ## 1.124.0 (Release on 2025-08-20)
 
 - Fix Base64 leak when no empty line between text and code block (<https://github.com/quarto-dev/quarto/pull/780>).

apps/vscode/src/test/examples/.gitignore

@@ -0,0 +1,2 @@
+*.html
+*_files

apps/vscode/src/test/examples/attr-equals.qmd

@@ -0,0 +1,52 @@
+# Testing equals signs in attribute values
+
+This test document validates that equals signs in attribute values are handled correctly.
+
+This prose contains some equals signs, just in case. A=B=C. D=E=F. =
+
+## Basic examples
+
+- Basic link with equals in value: [Link text](https://example.com){key=value=with=equals}
+
+- Link with URL parameter: [Query link](https://example.com?param=value){.class key=query=param}
+
+- Span with complex value: [Span text]{#id .class key=complex=value}
+
+- Other weird examples: [Span text](key=) [Span](===)
+
+## More complex examples
+
+- CSS style with equals: [Styled text]{style=color:red;font-size=12px}
+
+- Math expression value: [Math formula]{formula=E=mc^2}
+
+- Code with equals: `code sample`{lang=c++ key=value=val}
+
+## Code blocks
+
+```{python key=value=equals}
+print("Testing equals in attribute values")
+```
+
+```{r eval=1+1=2}
+print("R code with equals in attributes")
+```
+
+## Div with attributes
+
+:::{#div-id key=value=with=multiple=equals}
+This is a div with multiple equals signs in attribute values.
+:::
+
+## Image with equals signs
+
+![Image caption](image.png){width=50% height=30% key=value=equals}
+
+## Table with equals signs
+
+| Col1 | Col2 |
+|------|------|
+| A    | B    |
+| C    | D    |
+
+: Table caption {#tbl-id tbl-colwidths="[50,50]" key=value=with=equals}

apps/vscode/src/test/examples/generated_snapshots/roundtripped-attr-equals.qmd

@@ -0,0 +1,52 @@
+# Testing equals signs in attribute values
+
+This test document validates that equals signs in attribute values are handled correctly.
+
+This prose contains some equals signs, just in case. A=B=C. D=E=F. =
+
+## Basic examples
+
+-   Basic link with equals in value: [Link text](https://example.com){key="value=with=equals"}
+
+-   Link with URL parameter: [Query link](https://example.com?param=value){.class key="query=param"}
+
+-   Span with complex value: [Span text]{#id .class key="complex=value"}
+
+-   Other weird examples: [Span text](key=) [Span](===)
+
+## More complex examples
+
+-   CSS style with equals: [Styled text]{style="color:red;font-size=12px"}
+
+-   Math expression value: [Math formula]{formula="E=mc^2"}
+
+-   Code with equals: `code sample`{lang="c++" key="value=val"}
+
+## Code blocks
+
+```{python key=value=equals}
+print("Testing equals in attribute values")
+```
+
+```{r eval=1+1=2}
+print("R code with equals in attributes")
+```
+
+## Div with attributes
+
+::: {#div-id key="value=with=multiple=equals"}
+This is a div with multiple equals signs in attribute values.
+:::
+
+## Image with equals signs
+
+![Image caption](image.png){width="50%" height="30%" key="value=equals"}
+
+## Table with equals signs
+
+| Col1 | Col2 |
+|------|------|
+| A    | B    |
+| C    | D    |
+
+: Table caption {#tbl-id tbl-colwidths="\[50,50\]" key=value=with=equals}

apps/vscode/src/test/quartoDoc.test.ts

@@ -39,6 +39,8 @@ suite("Quarto basics", function () {
   roundtripSnapshotTest('invalid.qmd');
 
   roundtripSnapshotTest('capsule-leak.qmd');
+
+  roundtripSnapshotTest('attr-equals.qmd');
 });
 
 /**

packages/editor/src/api/pandoc_attr.ts

@@ -311,8 +311,14 @@ export function pandocAttrKeyvalueFromText(text: string, separator: ' ' | '\n'):
 
   const lines = text.trim().split('\n');
   return lines.map(line => {
-    const parts = line.trim().split('=');
-    return [parts[0], (parts[1] || '').replace(/^"/, '').replace(/"$/, '')];
+    const idx = line.indexOf('=');
+    if (idx === -1) {
+      return [line.trim(), ""]
+    } else {
+      const lhs = line.substring(0, idx).trim();
+      const rhs = line.substring(idx + 1).trim();
+      return [lhs, rhs.replace(/^"/, '').replace(/"$/, '')];
+    }
   });
 }
 

packages/quarto-core/src/context.ts

@@ -206,7 +206,7 @@ function scanForQuarto(additionalSearchPaths?: string[]): QuartoInstallation | u
     }
     scanPaths.push("C:\\Program Files\\RStudio\\bin\\quarto\\bin");
   } else if (os.platform() === "darwin") {
-    scanPaths.push("/Applications/quarto/bin/");
+    scanPaths.push("/Applications/quarto/bin");
     const home = process.env.HOME;
     if (home) {
       scanPaths.push(path.join(home, "Applications", "quarto", "bin"));